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Rappid v2.3.3 - HTML5 Diagramming Framework\n\nCopyright (c) 2015 client IO\n\n 2018-08-03 \n\n\nThis Source Code Form is subject to the terms of the Rappid License\n, v. 2.0. If a copy of the Rappid License was not distributed with this\nfile, You can obtain one at http://jointjs.com/license/rappid_v2.txt\n or from the Rappid archive as was distributed by client IO. See the LICENSE file.*/\n\n\n(function(root, factory) {\n\n    if (typeof define === 'function' && define.amd) {\n\n        // For AMD.\n\n        define(['backbone', 'lodash', 'jquery'], function(Backbone, _, $) {\n\n            Backbone.$ = $\n\n            return factory(root, Backbone, _, $)\n        })\n\n    } else if (typeof exports !== 'undefined') {\n\n        // For Node.js or CommonJS.\n\n        var Backbone = require('backbone')\n        var _ = require('lodash')\n        var $ = Backbone.$ = require('jquery')\n\n        module.exports = factory(root, Backbone, _, $)\n\n    } else {\n\n        // As a browser global.\n\n        var {Backbone} = root\n        var {_} = root\n        var $ = Backbone.$ = root.jQuery || root.$\n\n        root.joint = factory(root, Backbone, _, $)\n        root.g = root.joint.g\n        root.V = root.Vectorizer = root.joint.V\n    }\n\n}(this, function(root, Backbone, _, $) {\n\n(function() {\n\n    /**\n     * version: 0.3.0\n     * git://github.com/davidchambers/Base64.js.git\n     */\n\n    const object = typeof exports !== 'undefined' ? exports : this // #8: web workers\n    const chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/='\n\n    function InvalidCharacterError(message) {\n        this.message = message\n    }\n\n    InvalidCharacterError.prototype = new Error\n    InvalidCharacterError.prototype.name = 'InvalidCharacterError'\n\n    // encoder\n    // [https://gist.github.com/999166] by [https://github.com/nignag]\n    object.btoa || (\n        object.btoa = function(input) {\n            const str = String(input)\n            for (\n                // initialize result and counter\n                var block, charCode, idx = 0, map = chars, output = '';\n                // if the next str index does not exist:\n                //   change the mapping table to \"=\"\n                //   check if d has no fractional digits\n                str.charAt(idx | 0) || (map = '=', idx % 1);\n                // \"8 - idx % 1 * 8\" generates the sequence 2, 4, 6, 8\n                output += map.charAt(63 & block >> 8 - idx % 1 * 8)\n            ) {\n                charCode = str.charCodeAt(idx += 3 / 4)\n                if (charCode > 0xFF) {\n                    throw new InvalidCharacterError('\\'btoa\\' failed: The string to be encoded contains characters outside of the Latin1 range.')\n                }\n                block = block << 8 | charCode\n            }\n            return output\n        })\n\n    // decoder\n    // [https://gist.github.com/1020396] by [https://github.com/atk]\n    object.atob || (\n        object.atob = function(input) {\n            const str = String(input).replace(/=+$/, '')\n            if (str.length % 4 == 1) {\n                throw new InvalidCharacterError('\\'atob\\' failed: The string to be decoded is not correctly encoded.')\n            }\n            for (\n                // initialize result and counters\n                var bc = 0, bs, buffer, idx = 0, output = '';\n                // get next character\n                // eslint-disable-next-line no-cond-assign\n                buffer = str.charAt(idx++);\n                // character found in table? initialize bit storage and add its ascii value;\n                ~buffer && (bs = bc % 4 ? bs * 64 + buffer : buffer,\n                // and if not first of each 4 characters,\n                // convert the first 8 bits to one ascii character\n                bc++ % 4) ? output += String.fromCharCode(255 & bs >> (-2 * bc & 6)) : 0\n            ) {\n                // try to find character in table (0-63, not found => -1)\n                buffer = chars.indexOf(buffer)\n            }\n            return output\n        })\n\n}());\n\n(function() {\n\n    if (typeof Uint8Array !== 'undefined' || typeof window === 'undefined') {\n        return\n    }\n\n    function subarray(start, end) {\n        return this.slice(start, end)\n    }\n\n    function set_(array, offset) {\n\n        if (arguments.length < 2) {\n            offset = 0\n        }\n        for (let i = 0, n = array.length; i < n; ++i, ++offset) {\n            this[offset] = array[i] & 0xFF\n        }\n    }\n\n    // we need typed arrays\n    function TypedArray(arg1) {\n\n        let result\n        if (typeof arg1 === 'number') {\n            result = new Array(arg1)\n            for (let i = 0; i < arg1; ++i) {\n                result[i] = 0\n            }\n        } else {\n            result = arg1.slice(0)\n        }\n        result.subarray = subarray\n        result.buffer = result\n        result.byteLength = result.length\n        result.set = set_\n        if (typeof arg1 === 'object' && arg1.buffer) {\n            result.buffer = arg1.buffer\n        }\n\n        return result\n    }\n\n    window.Uint8Array = TypedArray\n    window.Uint32Array = TypedArray\n    window.Int32Array = TypedArray\n})();\n\n/**\n * make xhr.response = 'arraybuffer' available for the IE9\n */\n(function() {\n\n    if (typeof XMLHttpRequest === 'undefined') {\n        return\n    }\n\n    if ('response' in XMLHttpRequest.prototype ||\n        'mozResponseArrayBuffer' in XMLHttpRequest.prototype ||\n        'mozResponse' in XMLHttpRequest.prototype ||\n        'responseArrayBuffer' in XMLHttpRequest.prototype) {\n        return\n    }\n\n    Object.defineProperty(XMLHttpRequest.prototype, 'response', {\n        get: function() {\n            /* global VBArray:true */\n            return new Uint8Array(new VBArray(this.responseBody).toArray())\n        }\n    })\n})()\n\n// https://tc39.github.io/ecma262/#sec-array.prototype.includes\nif (!Array.prototype.includes) {\n    Object.defineProperty(Array.prototype, 'includes', {\n        value: function(searchElement, fromIndex) {\n\n            // 1. Let O be ? ToObject(this value).\n            if (this == null) {\n                throw new TypeError('\"this\" is null or not defined')\n            }\n\n            const o = Object(this)\n\n            // 2. Let len be ? ToLength(? Get(O, \"length\")).\n            const len = o.length >>> 0\n\n            // 3. If len is 0, return false.\n            if (len === 0) {\n                return false\n            }\n\n            // 4. Let n be ? ToInteger(fromIndex).\n            //    (If fromIndex is undefined, this step produces the value 0.)\n            const n = fromIndex | 0\n\n            // 5. If n ≥ 0, then\n            //  a. Let k be n.\n            // 6. Else n < 0,\n            //  a. Let k be len + n.\n            //  b. If k < 0, let k be 0.\n            let k = Math.max(n >= 0 ? n : len - Math.abs(n), 0)\n\n            function sameValueZero(x, y) {\n                return x === y || (typeof x === 'number' && typeof y === 'number' && isNaN(x) && isNaN(y))\n            }\n\n            // 7. Repeat, while k < len\n            while (k < len) {\n                // a. Let elementK be the result of ? Get(O, ! ToString(k)).\n                // b. If SameValueZero(searchElement, elementK) is true, return true.\n                // c. Increase k by 1.\n                if (sameValueZero(o[k], searchElement)) {\n                    return true\n                }\n                k++\n            }\n\n            // 8. Return false\n            return false\n        }\n    })\n}\n\n// https://tc39.github.io/ecma262/#sec-array.prototype.find\nif (!Array.prototype.find) {\n    Object.defineProperty(Array.prototype, 'find', {\n        value: function(predicate) {\n            // 1. Let O be ? ToObject(this value).\n            if (this == null) {\n                throw new TypeError('\"this\" is null or not defined')\n            }\n\n            const o = Object(this)\n\n            // 2. Let len be ? ToLength(? Get(O, \"length\")).\n            const len = o.length >>> 0\n\n            // 3. If IsCallable(predicate) is false, throw a TypeError exception.\n            if (typeof predicate !== 'function') {\n                throw new TypeError('predicate must be a function')\n            }\n\n            // 4. If thisArg was supplied, let T be thisArg; else let T be undefined.\n            const thisArg = arguments[1]\n\n            // 5. Let k be 0.\n            let k = 0\n\n            // 6. Repeat, while k < len\n            while (k < len) {\n                // a. Let Pk be ! ToString(k).\n                // b. Let kValue be ? Get(O, Pk).\n                // c. Let testResult be ToBoolean(? Call(predicate, T, « kValue, k, O »)).\n                // d. If testResult is true, return kValue.\n                const kValue = o[k]\n                if (predicate.call(thisArg, kValue, k, o)) {\n                    return kValue\n                }\n                // e. Increase k by 1.\n                k++\n            }\n\n            // 7. Return undefined.\n            return undefined\n        }\n    })\n}\n\n// Production steps of ECMA-262, Edition 6, 22.1.2.1\nif (!Array.from) {\n    Array.from = (function() {\n        const toStr = Object.prototype.toString\n        const isCallable = function(fn) {\n            return typeof fn === 'function' || toStr.call(fn) === '[object Function]'\n        }\n        const toInteger = function(value) {\n            const number = Number(value)\n            if (isNaN(number)) { return 0 }\n            if (number === 0 || !isFinite(number)) { return number }\n            return (number > 0 ? 1 : -1) * Math.floor(Math.abs(number))\n        }\n        const maxSafeInteger = Math.pow(2, 53) - 1\n        const toLength = function(value) {\n            const len = toInteger(value)\n            return Math.min(Math.max(len, 0), maxSafeInteger)\n        }\n\n        // The length property of the from method is 1.\n        return function from(arrayLike/*, mapFn, thisArg */) {\n            // 1. Let C be the this value.\n            const C = this\n\n            // 2. Let items be ToObject(arrayLike).\n            const items = Object(arrayLike)\n\n            // 3. ReturnIfAbrupt(items).\n            if (arrayLike == null) {\n                throw new TypeError('Array.from requires an array-like object - not null or undefined')\n            }\n\n            // 4. If mapfn is undefined, then let mapping be false.\n            const mapFn = arguments.length > 1 ? arguments[1] : void undefined\n            let T\n            if (typeof mapFn !== 'undefined') {\n                // 5. else\n                // 5. a If IsCallable(mapfn) is false, throw a TypeError exception.\n                if (!isCallable(mapFn)) {\n                    throw new TypeError('Array.from: when provided, the second argument must be a function')\n                }\n\n                // 5. b. If thisArg was supplied, let T be thisArg; else let T be undefined.\n                if (arguments.length > 2) {\n                    T = arguments[2]\n                }\n            }\n\n            // 10. Let lenValue be Get(items, \"length\").\n            // 11. Let len be ToLength(lenValue).\n            const len = toLength(items.length)\n\n            // 13. If IsConstructor(C) is true, then\n            // 13. a. Let A be the result of calling the [[Construct]] internal method\n            // of C with an argument list containing the single item len.\n            // 14. a. Else, Let A be ArrayCreate(len).\n            const A = isCallable(C) ? Object(new C(len)) : new Array(len)\n\n            // 16. Let k be 0.\n            let k = 0\n            // 17. Repeat, while k < len… (also steps a - h)\n            let kValue\n            while (k < len) {\n                kValue = items[k]\n                if (mapFn) {\n                    A[k] = typeof T === 'undefined' ? mapFn(kValue, k) : mapFn.call(T, kValue, k)\n                } else {\n                    A[k] = kValue\n                }\n                k += 1\n            }\n            // 18. Let putStatus be Put(A, \"length\", len, true).\n            A.length = len\n            // 20. Return A.\n            return A\n        }\n    }())\n}\n\n// https://tc39.github.io/ecma262/#sec-array.prototype.findIndex\nif (!Array.prototype.findIndex) {\n    Object.defineProperty(Array.prototype, 'findIndex', {\n        value: function(predicate) {\n            // 1. Let O be ? ToObject(this value).\n            if (this == null) {\n                throw new TypeError('\"this\" is null or not defined')\n            }\n\n            const o = Object(this)\n\n            // 2. Let len be ? ToLength(? Get(O, \"length\")).\n            const len = o.length >>> 0\n\n            // 3. If IsCallable(predicate) is false, throw a TypeError exception.\n            if (typeof predicate !== 'function') {\n                throw new TypeError('predicate must be a function')\n            }\n\n            // 4. If thisArg was supplied, let T be thisArg; else let T be undefined.\n            const thisArg = arguments[1]\n\n            // 5. Let k be 0.\n            let k = 0\n\n            // 6. Repeat, while k < len\n            while (k < len) {\n                // a. Let Pk be ! ToString(k).\n                // b. Let kValue be ? Get(O, Pk).\n                // c. Let testResult be ToBoolean(? Call(predicate, T, « kValue, k, O »)).\n                // d. If testResult is true, return k.\n                const kValue = o[k]\n                if (predicate.call(thisArg, kValue, k, o)) {\n                    return k\n                }\n                // e. Increase k by 1.\n                k++\n            }\n\n            // 7. Return -1.\n            return -1\n        }\n    })\n}\n\nif (!String.prototype.includes) {\n    String.prototype.includes = function(search, start) {\n        \n        if (typeof start !== 'number') {\n            start = 0\n        }\n\n        if (start + search.length > this.length) {\n            return false\n        } else {\n            return this.indexOf(search, start) !== -1\n        }\n    }\n}\n\nif (!String.prototype.startsWith) {\n    String.prototype.startsWith = function(searchString, position){\n        return this.substr(position || 0, searchString.length) === searchString\n    }\n}\n\nNumber.isFinite = Number.isFinite || function(value) {\n    return typeof value === 'number' && isFinite(value)\n}\n\n//The following works because NaN is the only value in javascript which is not equal to itself.\nNumber.isNaN = Number.isNaN || function(value) {\n    return value !== value\n}\n\n\n// Geometry library.\n// -----------------\n\nconst g = {};\n\n(function(g) {\n\n    // Declare shorthands to the most used math functions.\n    const math = Math\n    const {abs} = math\n    const {cos} = math\n    const {sin} = math\n    const {sqrt} = math\n    const {min} = math\n    const {max} = math\n    const {atan2} = math\n    const {round} = math\n    const {floor} = math\n    const {PI} = math\n    const {random} = math\n    const {pow} = math\n\n    g.bezier = {\n\n        // Cubic Bezier curve path through points.\n        // @deprecated\n        // @param {array} points Array of points through which the smooth line will go.\n        // @return {array} SVG Path commands as an array\n        curveThroughPoints: function(points) {\n\n            console.warn('deprecated')\n\n            return new Path(Curve.throughPoints(points)).serialize()\n        },\n\n        // Get open-ended Bezier Spline Control Points.\n        // @deprecated\n        // @param knots Input Knot Bezier spline points (At least two points!).\n        // @param firstControlPoints Output First Control points. Array of knots.length - 1 length.\n        // @param secondControlPoints Output Second Control points. Array of knots.length - 1 length.\n        getCurveControlPoints: function(knots) {\n\n            console.warn('deprecated')\n\n            const firstControlPoints = []\n            const secondControlPoints = []\n            const n = knots.length - 1\n            let i\n\n            // Special case: Bezier curve should be a straight line.\n            if (n == 1) {\n                // 3P1 = 2P0 + P3\n                firstControlPoints[0] = new Point(\n                    (2 * knots[0].x + knots[1].x) / 3,\n                    (2 * knots[0].y + knots[1].y) / 3\n                )\n\n                // P2 = 2P1 – P0\n                secondControlPoints[0] = new Point(\n                    2 * firstControlPoints[0].x - knots[0].x,\n                    2 * firstControlPoints[0].y - knots[0].y\n                )\n\n                return [firstControlPoints, secondControlPoints]\n            }\n\n            // Calculate first Bezier control points.\n            // Right hand side vector.\n            const rhs = []\n\n            // Set right hand side X values.\n            for (i = 1; i < n - 1; i++) {\n                rhs[i] = 4 * knots[i].x + 2 * knots[i + 1].x\n            }\n\n            rhs[0] = knots[0].x + 2 * knots[1].x\n            rhs[n - 1] = (8 * knots[n - 1].x + knots[n].x) / 2.0\n\n            // Get first control points X-values.\n            const x = this.getFirstControlPoints(rhs)\n\n            // Set right hand side Y values.\n            for (i = 1; i < n - 1; ++i) {\n                rhs[i] = 4 * knots[i].y + 2 * knots[i + 1].y\n            }\n\n            rhs[0] = knots[0].y + 2 * knots[1].y\n            rhs[n - 1] = (8 * knots[n - 1].y + knots[n].y) / 2.0\n\n            // Get first control points Y-values.\n            const y = this.getFirstControlPoints(rhs)\n\n            // Fill output arrays.\n            for (i = 0; i < n; i++) {\n                // First control point.\n                firstControlPoints.push(new Point(x[i], y[i]))\n\n                // Second control point.\n                if (i < n - 1) {\n                    secondControlPoints.push(new Point(\n                        2 * knots [i + 1].x - x[i + 1],\n                        2 * knots[i + 1].y - y[i + 1]\n                    ))\n\n                } else {\n                    secondControlPoints.push(new Point(\n                        (knots[n].x + x[n - 1]) / 2,\n                        (knots[n].y + y[n - 1]) / 2)\n                    )\n                }\n            }\n\n            return [firstControlPoints, secondControlPoints]\n        },\n\n        // Solves a tridiagonal system for one of coordinates (x or y) of first Bezier control points.\n        // @deprecated\n        // @param rhs Right hand side vector.\n        // @return Solution vector.\n        getFirstControlPoints: function(rhs) {\n\n            console.warn('deprecated')\n\n            const n = rhs.length\n            // `x` is a solution vector.\n            const x = []\n            const tmp = []\n            let b = 2.0\n\n            x[0] = rhs[0] / b\n\n            // Decomposition and forward substitution.\n            for (var i = 1; i < n; i++) {\n                tmp[i] = 1 / b\n                b = (i < n - 1 ? 4.0 : 3.5) - tmp[i]\n                x[i] = (rhs[i] - x[i - 1]) / b\n            }\n\n            for (i = 1; i < n; i++) {\n                // Backsubstitution.\n                x[n - i - 1] -= tmp[n - i] * x[n - i]\n            }\n\n            return x\n        },\n\n        // Divide a Bezier curve into two at point defined by value 't' <0,1>.\n        // Using deCasteljau algorithm. http://math.stackexchange.com/a/317867\n        // @deprecated\n        // @param control points (start, control start, control end, end)\n        // @return a function that accepts t and returns 2 curves.\n        getCurveDivider: function(p0, p1, p2, p3) {\n\n            console.warn('deprecated')\n\n            const curve = new Curve(p0, p1, p2, p3)\n\n            return function divideCurve(t) {\n\n                const divided = curve.divide(t)\n\n                return [{\n                    p0: divided[0].start,\n                    p1: divided[0].controlPoint1,\n                    p2: divided[0].controlPoint2,\n                    p3: divided[0].end\n                }, {\n                    p0: divided[1].start,\n                    p1: divided[1].controlPoint1,\n                    p2: divided[1].controlPoint2,\n                    p3: divided[1].end\n                }]\n            }\n        },\n\n        // Solves an inversion problem -- Given the (x, y) coordinates of a point which lies on\n        // a parametric curve x = x(t)/w(t), y = y(t)/w(t), find the parameter value t\n        // which corresponds to that point.\n        // @deprecated\n        // @param control points (start, control start, control end, end)\n        // @return a function that accepts a point and returns t.\n        getInversionSolver: function(p0, p1, p2, p3) {\n\n            console.warn('deprecated')\n\n            const curve = new Curve(p0, p1, p2, p3)\n\n            return function solveInversion(p) {\n\n                return curve.closestPointT(p)\n            }\n        }\n    }\n\n    var Curve = g.Curve = function(p1, p2, p3, p4) {\n\n        if (!(this instanceof Curve)) {\n            return new Curve(p1, p2, p3, p4)\n        }\n\n        if (p1 instanceof Curve) {\n            return new Curve(p1.start, p1.controlPoint1, p1.controlPoint2, p1.end)\n        }\n\n        this.start = new Point(p1)\n        this.controlPoint1 = new Point(p2)\n        this.controlPoint2 = new Point(p3)\n        this.end = new Point(p4)\n    }\n\n    // Curve passing through points.\n    // Ported from C# implementation by Oleg V. Polikarpotchkin and Peter Lee (http://www.codeproject.com/KB/graphics/BezierSpline.aspx).\n    // @param {array} points Array of points through which the smooth line will go.\n    // @return {array} curves.\n    Curve.throughPoints = (function() {\n\n        // Solves a tridiagonal system for one of coordinates (x or y) of first Bezier control points.\n        // @param rhs Right hand side vector.\n        // @return Solution vector.\n        function getFirstControlPoints(rhs) {\n\n            const n = rhs.length\n            // `x` is a solution vector.\n            const x = []\n            const tmp = []\n            let b = 2.0\n\n            x[0] = rhs[0] / b\n\n            // Decomposition and forward substitution.\n            for (var i = 1; i < n; i++) {\n                tmp[i] = 1 / b\n                b = (i < n - 1 ? 4.0 : 3.5) - tmp[i]\n                x[i] = (rhs[i] - x[i - 1]) / b\n            }\n\n            for (i = 1; i < n; i++) {\n                // Backsubstitution.\n                x[n - i - 1] -= tmp[n - i] * x[n - i]\n            }\n\n            return x\n        }\n\n        // Get open-ended Bezier Spline Control Points.\n        // @param knots Input Knot Bezier spline points (At least two points!).\n        // @param firstControlPoints Output First Control points. Array of knots.length - 1 length.\n        // @param secondControlPoints Output Second Control points. Array of knots.length - 1 length.\n        function getCurveControlPoints(knots) {\n\n            const firstControlPoints = []\n            const secondControlPoints = []\n            const n = knots.length - 1\n            let i\n\n            // Special case: Bezier curve should be a straight line.\n            if (n == 1) {\n                // 3P1 = 2P0 + P3\n                firstControlPoints[0] = new Point(\n                    (2 * knots[0].x + knots[1].x) / 3,\n                    (2 * knots[0].y + knots[1].y) / 3\n                )\n\n                // P2 = 2P1 – P0\n                secondControlPoints[0] = new Point(\n                    2 * firstControlPoints[0].x - knots[0].x,\n                    2 * firstControlPoints[0].y - knots[0].y\n                )\n\n                return [firstControlPoints, secondControlPoints]\n            }\n\n            // Calculate first Bezier control points.\n            // Right hand side vector.\n            const rhs = []\n\n            // Set right hand side X values.\n            for (i = 1; i < n - 1; i++) {\n                rhs[i] = 4 * knots[i].x + 2 * knots[i + 1].x\n            }\n\n            rhs[0] = knots[0].x + 2 * knots[1].x\n            rhs[n - 1] = (8 * knots[n - 1].x + knots[n].x) / 2.0\n\n            // Get first control points X-values.\n            const x = getFirstControlPoints(rhs)\n\n            // Set right hand side Y values.\n            for (i = 1; i < n - 1; ++i) {\n                rhs[i] = 4 * knots[i].y + 2 * knots[i + 1].y\n            }\n\n            rhs[0] = knots[0].y + 2 * knots[1].y\n            rhs[n - 1] = (8 * knots[n - 1].y + knots[n].y) / 2.0\n\n            // Get first control points Y-values.\n            const y = getFirstControlPoints(rhs)\n\n            // Fill output arrays.\n            for (i = 0; i < n; i++) {\n                // First control point.\n                firstControlPoints.push(new Point(x[i], y[i]))\n\n                // Second control point.\n                if (i < n - 1) {\n                    secondControlPoints.push(new Point(\n                        2 * knots [i + 1].x - x[i + 1],\n                        2 * knots[i + 1].y - y[i + 1]\n                    ))\n\n                } else {\n                    secondControlPoints.push(new Point(\n                        (knots[n].x + x[n - 1]) / 2,\n                        (knots[n].y + y[n - 1]) / 2\n                    ))\n                }\n            }\n\n            return [firstControlPoints, secondControlPoints]\n        }\n\n        return function(points) {\n\n            if (!points || (Array.isArray(points) && points.length < 2)) {\n                throw new Error('At least 2 points are required')\n            }\n\n            const controlPoints = getCurveControlPoints(points)\n\n            const curves = []\n            const n = controlPoints[0].length\n            for (let i = 0; i < n; i++) {\n\n                const controlPoint1 = new Point(controlPoints[0][i].x, controlPoints[0][i].y)\n                const controlPoint2 = new Point(controlPoints[1][i].x, controlPoints[1][i].y)\n\n                curves.push(new Curve(points[i], controlPoint1, controlPoint2, points[i + 1]))\n            }\n\n            return curves\n        }\n    })()\n\n    Curve.prototype = {\n\n        // Returns a bbox that tightly envelops the curve.\n        bbox: function() {\n\n            const {start} = this\n            const {controlPoint1} = this\n            const {controlPoint2} = this\n            const {end} = this\n\n            const x0 = start.x\n            const y0 = start.y\n            const x1 = controlPoint1.x\n            const y1 = controlPoint1.y\n            const x2 = controlPoint2.x\n            const y2 = controlPoint2.y\n            const x3 = end.x\n            const y3 = end.y\n\n            const points = new Array() // local extremes\n            const tvalues = new Array() // t values of local extremes\n            const bounds = [new Array(), new Array()]\n\n            let a; let b; let c; let t\n            let t1; let t2\n            let b2ac; let sqrtb2ac\n\n            for (let i = 0; i < 2; ++i) {\n\n                if (i === 0) {\n                    b = 6 * x0 - 12 * x1 + 6 * x2\n                    a = -3 * x0 + 9 * x1 - 9 * x2 + 3 * x3\n                    c = 3 * x1 - 3 * x0\n\n                } else {\n                    b = 6 * y0 - 12 * y1 + 6 * y2\n                    a = -3 * y0 + 9 * y1 - 9 * y2 + 3 * y3\n                    c = 3 * y1 - 3 * y0\n                }\n\n                if (abs(a) < 1e-12) { // Numerical robustness\n                    if (abs(b) < 1e-12) { // Numerical robustness\n                        continue\n                    }\n\n                    t = -c / b\n                    if ((t > 0) && (t < 1)) tvalues.push(t)\n\n                    continue\n                }\n\n                b2ac = b * b - 4 * c * a\n                sqrtb2ac = sqrt(b2ac)\n\n                if (b2ac < 0) continue\n\n                t1 = (-b + sqrtb2ac) / (2 * a)\n                if ((t1 > 0) && (t1 < 1)) tvalues.push(t1)\n\n                t2 = (-b - sqrtb2ac) / (2 * a)\n                if ((t2 > 0) && (t2 < 1)) tvalues.push(t2)\n            }\n\n            let j = tvalues.length\n            const jlen = j\n            let mt\n            let x; let y\n\n            while (j--) {\n                t = tvalues[j]\n                mt = 1 - t\n\n                x = (mt * mt * mt * x0) + (3 * mt * mt * t * x1) + (3 * mt * t * t * x2) + (t * t * t * x3)\n                bounds[0][j] = x\n\n                y = (mt * mt * mt * y0) + (3 * mt * mt * t * y1) + (3 * mt * t * t * y2) + (t * t * t * y3)\n                bounds[1][j] = y\n\n                points[j] = { X: x, Y: y }\n            }\n\n            tvalues[jlen] = 0\n            tvalues[jlen + 1] = 1\n\n            points[jlen] = { X: x0, Y: y0 }\n            points[jlen + 1] = { X: x3, Y: y3 }\n\n            bounds[0][jlen] = x0\n            bounds[1][jlen] = y0\n\n            bounds[0][jlen + 1] = x3\n            bounds[1][jlen + 1] = y3\n\n            tvalues.length = jlen + 2\n            bounds[0].length = jlen + 2\n            bounds[1].length = jlen + 2\n            points.length = jlen + 2\n\n            const left = min.apply(null, bounds[0])\n            const top = min.apply(null, bounds[1])\n            const right = max.apply(null, bounds[0])\n            const bottom = max.apply(null, bounds[1])\n\n            return new Rect(left, top, (right - left), (bottom - top))\n        },\n\n        clone: function() {\n\n            return new Curve(this.start, this.controlPoint1, this.controlPoint2, this.end)\n        },\n\n        // Returns the point on the curve closest to point `p`\n        closestPoint: function(p, opt) {\n\n            return this.pointAtT(this.closestPointT(p, opt))\n        },\n\n        closestPointLength: function(p, opt) {\n\n            opt = opt || {}\n            const precision = (opt.precision === undefined) ? this.PRECISION : opt.precision\n            const subdivisions = (opt.subdivisions === undefined) ? this.getSubdivisions({ precision: precision }) : opt.subdivisions\n            const localOpt = { precision: precision, subdivisions: subdivisions }\n\n            return this.lengthAtT(this.closestPointT(p, localOpt), localOpt)\n        },\n\n        closestPointNormalizedLength: function(p, opt) {\n\n            opt = opt || {}\n            const precision = (opt.precision === undefined) ? this.PRECISION : opt.precision\n            const subdivisions = (opt.subdivisions === undefined) ? this.getSubdivisions({ precision: precision }) : opt.subdivisions\n            const localOpt = { precision: precision, subdivisions: subdivisions }\n\n            const cpLength = this.closestPointLength(p, localOpt)\n            if (!cpLength) return 0\n\n            const length = this.length(localOpt)\n            if (length === 0) return 0\n\n            return cpLength / length\n        },\n\n        // Returns `t` of the point on the curve closest to point `p`\n        closestPointT: function(p, opt) {\n\n            opt = opt || {}\n            const precision = (opt.precision === undefined) ? this.PRECISION : opt.precision\n            const subdivisions = (opt.subdivisions === undefined) ? this.getSubdivisions({ precision: precision }) : opt.subdivisions\n            // does not use localOpt\n\n            // identify the subdivision that contains the point:\n            let investigatedSubdivision\n            let investigatedSubdivisionStartT // assume that subdivisions are evenly spaced\n            let investigatedSubdivisionEndT\n            let distFromStart // distance of point from start of baseline\n            let distFromEnd // distance of point from end of baseline\n            let minSumDist // lowest observed sum of the two distances\n            const n = subdivisions.length\n            let subdivisionSize = (n ? (1 / n) : 0)\n            for (let i = 0; i < n; i++) {\n\n                const currentSubdivision = subdivisions[i]\n\n                const startDist = currentSubdivision.start.distance(p)\n                const endDist = currentSubdivision.end.distance(p)\n                const sumDist = startDist + endDist\n\n                // check that the point is closest to current subdivision and not any other\n                if (!minSumDist || (sumDist < minSumDist)) {\n                    investigatedSubdivision = currentSubdivision\n\n                    investigatedSubdivisionStartT = i * subdivisionSize\n                    investigatedSubdivisionEndT = (i + 1) * subdivisionSize\n\n                    distFromStart = startDist\n                    distFromEnd = endDist\n\n                    minSumDist = sumDist\n                }\n            }\n\n            const precisionRatio = pow(10, -precision)\n\n            // recursively divide investigated subdivision:\n            // until distance between baselinePoint and closest path endpoint is within 10^(-precision)\n            // then return the closest endpoint of that final subdivision\n            while (true) {\n\n                // check if we have reached required observed precision\n                var startPrecisionRatio\n                var endPrecisionRatio\n\n                startPrecisionRatio = (distFromStart ? (abs(distFromStart - distFromEnd) / distFromStart) : 0)\n                endPrecisionRatio = (distFromEnd ? (abs(distFromStart - distFromEnd) / distFromEnd) : 0)\n                if ((startPrecisionRatio < precisionRatio) || (endPrecisionRatio) < precisionRatio) {\n                    return ((distFromStart <= distFromEnd) ? investigatedSubdivisionStartT : investigatedSubdivisionEndT)\n                }\n\n                // otherwise, set up for next iteration\n                const divided = investigatedSubdivision.divide(0.5)\n                subdivisionSize /= 2\n\n                const startDist1 = divided[0].start.distance(p)\n                const endDist1 = divided[0].end.distance(p)\n                const sumDist1 = startDist1 + endDist1\n\n                const startDist2 = divided[1].start.distance(p)\n                const endDist2 = divided[1].end.distance(p)\n                const sumDist2 = startDist2 + endDist2\n\n                if (sumDist1 <= sumDist2) {\n                    investigatedSubdivision = divided[0]\n\n                    investigatedSubdivisionEndT -= subdivisionSize // subdivisionSize was already halved\n\n                    distFromStart = startDist1\n                    distFromEnd = endDist1\n\n                } else {\n                    investigatedSubdivision = divided[1]\n\n                    investigatedSubdivisionStartT += subdivisionSize // subdivisionSize was already halved\n\n                    distFromStart = startDist2\n                    distFromEnd = endDist2\n                }\n            }\n        },\n\n        closestPointTangent: function(p, opt) {\n\n            return this.tangentAtT(this.closestPointT(p, opt))\n        },\n\n        // Divides the curve into two at point defined by `t` between 0 and 1.\n        // Using de Casteljau's algorithm (http://math.stackexchange.com/a/317867).\n        // Additional resource: https://pomax.github.io/bezierinfo/#decasteljau\n        divide: function(t) {\n\n            const {start} = this\n            const {controlPoint1} = this\n            const {controlPoint2} = this\n            const {end} = this\n\n            // shortcuts for `t` values that are out of range\n            if (t <= 0) {\n                return [\n                    new Curve(start, start, start, start),\n                    new Curve(start, controlPoint1, controlPoint2, end)\n                ]\n            }\n\n            if (t >= 1) {\n                return [\n                    new Curve(start, controlPoint1, controlPoint2, end),\n                    new Curve(end, end, end, end)\n                ]\n            }\n\n            const dividerPoints = this.getSkeletonPoints(t)\n\n            const startControl1 = dividerPoints.startControlPoint1\n            const startControl2 = dividerPoints.startControlPoint2\n            const {divider} = dividerPoints\n            const dividerControl1 = dividerPoints.dividerControlPoint1\n            const dividerControl2 = dividerPoints.dividerControlPoint2\n\n            // return array with two new curves\n            return [\n                new Curve(start, startControl1, startControl2, divider),\n                new Curve(divider, dividerControl1, dividerControl2, end)\n            ]\n        },\n\n        // Returns the distance between the curve's start and end points.\n        endpointDistance: function() {\n\n            return this.start.distance(this.end)\n        },\n\n        // Checks whether two curves are exactly the same.\n        equals: function(c) {\n\n            return !!c &&\n                    this.start.x === c.start.x &&\n                    this.start.y === c.start.y &&\n                    this.controlPoint1.x === c.controlPoint1.x &&\n                    this.controlPoint1.y === c.controlPoint1.y &&\n                    this.controlPoint2.x === c.controlPoint2.x &&\n                    this.controlPoint2.y === c.controlPoint2.y &&\n                    this.end.x === c.end.x &&\n                    this.end.y === c.end.y\n        },\n\n        // Returns five helper points necessary for curve division.\n        getSkeletonPoints: function(t) {\n\n            const {start} = this\n            const control1 = this.controlPoint1\n            const control2 = this.controlPoint2\n            const {end} = this\n\n            // shortcuts for `t` values that are out of range\n            if (t <= 0) {\n                return {\n                    startControlPoint1: start.clone(),\n                    startControlPoint2: start.clone(),\n                    divider: start.clone(),\n                    dividerControlPoint1: control1.clone(),\n                    dividerControlPoint2: control2.clone()\n                }\n            }\n\n            if (t >= 1) {\n                return {\n                    startControlPoint1: control1.clone(),\n                    startControlPoint2: control2.clone(),\n                    divider: end.clone(),\n                    dividerControlPoint1: end.clone(),\n                    dividerControlPoint2: end.clone()\n                }\n            }\n\n            const midpoint1 = (new Line(start, control1)).pointAt(t)\n            const midpoint2 = (new Line(control1, control2)).pointAt(t)\n            const midpoint3 = (new Line(control2, end)).pointAt(t)\n\n            const subControl1 = (new Line(midpoint1, midpoint2)).pointAt(t)\n            const subControl2 = (new Line(midpoint2, midpoint3)).pointAt(t)\n\n            const divider = (new Line(subControl1, subControl2)).pointAt(t)\n\n            const output = {\n                startControlPoint1: midpoint1,\n                startControlPoint2: subControl1,\n                divider: divider,\n                dividerControlPoint1: subControl2,\n                dividerControlPoint2: midpoint3\n            }\n\n            return output\n        },\n\n        // Returns a list of curves whose flattened length is better than `opt.precision`.\n        // That is, observed difference in length between recursions is less than 10^(-3) = 0.001 = 0.1%\n        // (Observed difference is not real precision, but close enough as long as special cases are covered)\n        // (That is why skipping iteration 1 is important)\n        // As a rule of thumb, increasing `precision` by 1 requires two more division operations\n        // - Precision 0 (endpointDistance) - total of 2^0 - 1 = 0 operations (1 subdivision)\n        // - Precision 1 (<10% error) - total of 2^2 - 1 = 3 operations (4 subdivisions)\n        // - Precision 2 (<1% error) - total of 2^4 - 1 = 15 operations requires 4 division operations on all elements (15 operations total) (16 subdivisions)\n        // - Precision 3 (<0.1% error) - total of 2^6 - 1 = 63 operations - acceptable when drawing (64 subdivisions)\n        // - Precision 4 (<0.01% error) - total of 2^8 - 1 = 255 operations - high resolution, can be used to interpolate `t` (256 subdivisions)\n        // (Variation of 1 recursion worse or better is possible depending on the curve, doubling/halving the number of operations accordingly)\n        getSubdivisions: function(opt) {\n\n            opt = opt || {}\n            const precision = (opt.precision === undefined) ? this.PRECISION : opt.precision\n            // not using opt.subdivisions\n            // not using localOpt\n\n            let subdivisions = [new Curve(this.start, this.controlPoint1, this.controlPoint2, this.end)]\n            if (precision === 0) return subdivisions\n\n            let previousLength = this.endpointDistance()\n\n            const precisionRatio = pow(10, -precision)\n\n            // recursively divide curve at `t = 0.5`\n            // until the difference between observed length at subsequent iterations is lower than precision\n            let iteration = 0\n            while (true) {\n                iteration += 1\n\n                // divide all subdivisions\n                const newSubdivisions = []\n                const numSubdivisions = subdivisions.length\n                for (let i = 0; i < numSubdivisions; i++) {\n\n                    const currentSubdivision = subdivisions[i]\n                    const divided = currentSubdivision.divide(0.5) // dividing at t = 0.5 (not at middle length!)\n                    newSubdivisions.push(divided[0], divided[1])\n                }\n\n                // measure new length\n                let length = 0\n                const numNewSubdivisions = newSubdivisions.length\n                for (let j = 0; j < numNewSubdivisions; j++) {\n\n                    const currentNewSubdivision = newSubdivisions[j]\n                    length += currentNewSubdivision.endpointDistance()\n                }\n\n                // check if we have reached required observed precision\n                // sine-like curves may have the same observed length in iteration 0 and 1 - skip iteration 1\n                // not a problem for further iterations because cubic curves cannot have more than two local extrema\n                // (i.e. cubic curves cannot intersect the baseline more than once)\n                // therefore two subsequent iterations cannot produce sampling with equal length\n                const observedPrecisionRatio = ((length !== 0) ? ((length - previousLength) / length) : 0)\n                if (iteration > 1 && observedPrecisionRatio < precisionRatio) {\n                    return newSubdivisions\n                }\n\n                // otherwise, set up for next iteration\n                subdivisions = newSubdivisions\n                previousLength = length\n            }\n        },\n\n        isDifferentiable: function() {\n\n            const {start} = this\n            const control1 = this.controlPoint1\n            const control2 = this.controlPoint2\n            const {end} = this\n\n            return !(start.equals(control1) && control1.equals(control2) && control2.equals(end))\n        },\n\n        // Returns flattened length of the curve with precision better than `opt.precision`; or using `opt.subdivisions` provided.\n        length: function(opt) {\n\n            opt = opt || {}\n            const precision = (opt.precision === undefined) ? this.PRECISION : opt.precision // opt.precision only used in getSubdivisions() call\n            const subdivisions = (opt.subdivisions === undefined) ? this.getSubdivisions({ precision: precision }) : opt.subdivisions\n            // not using localOpt\n\n            let length = 0\n            const n = subdivisions.length\n            for (let i = 0; i < n; i++) {\n\n                const currentSubdivision = subdivisions[i]\n                length += currentSubdivision.endpointDistance()\n            }\n\n            return length\n        },\n\n        // Returns distance along the curve up to `t` with precision better than requested `opt.precision`. (Not using `opt.subdivisions`.)\n        lengthAtT: function(t, opt) {\n\n            if (t <= 0) return 0\n\n            opt = opt || {}\n            const precision = (opt.precision === undefined) ? this.PRECISION : opt.precision\n            // not using opt.subdivisions\n            // not using localOpt\n\n            const subCurve = this.divide(t)[0]\n            const subCurveLength = subCurve.length({ precision: precision })\n\n            return subCurveLength\n        },\n\n        // Returns point at requested `ratio` between 0 and 1 with precision better than `opt.precision`; optionally using `opt.subdivisions` provided.\n        // Mirrors Line.pointAt() function.\n        // For a function that tracks `t`, use Curve.pointAtT().\n        pointAt: function(ratio, opt) {\n\n            if (ratio <= 0) return this.start.clone()\n            if (ratio >= 1) return this.end.clone()\n\n            const t = this.tAt(ratio, opt)\n\n            return this.pointAtT(t)\n        },\n\n        // Returns point at requested `length` with precision better than requested `opt.precision`; optionally using `opt.subdivisions` provided.\n        pointAtLength: function(length, opt) {\n\n            const t = this.tAtLength(length, opt)\n\n            return this.pointAtT(t)\n        },\n\n        // Returns the point at provided `t` between 0 and 1.\n        // `t` does not track distance along curve as it does in Line objects.\n        // Non-linear relationship, speeds up and slows down as curve warps!\n        // For linear length-based solution, use Curve.pointAt().\n        pointAtT: function(t) {\n\n            if (t <= 0) return this.start.clone()\n            if (t >= 1) return this.end.clone()\n\n            return this.getSkeletonPoints(t).divider\n        },\n\n        // Default precision\n        PRECISION: 3,\n\n        scale: function(sx, sy, origin) {\n\n            this.start.scale(sx, sy, origin)\n            this.controlPoint1.scale(sx, sy, origin)\n            this.controlPoint2.scale(sx, sy, origin)\n            this.end.scale(sx, sy, origin)\n            return this\n        },\n\n        // Returns a tangent line at requested `ratio` with precision better than requested `opt.precision`; or using `opt.subdivisions` provided.\n        tangentAt: function(ratio, opt) {\n\n            if (!this.isDifferentiable()) return null\n\n            if (ratio < 0) ratio = 0\n            else if (ratio > 1) ratio = 1\n\n            const t = this.tAt(ratio, opt)\n\n            return this.tangentAtT(t)\n        },\n\n        // Returns a tangent line at requested `length` with precision better than requested `opt.precision`; or using `opt.subdivisions` provided.\n        tangentAtLength: function(length, opt) {\n\n            if (!this.isDifferentiable()) return null\n\n            const t = this.tAtLength(length, opt)\n\n            return this.tangentAtT(t)\n        },\n\n        // Returns a tangent line at requested `t`.\n        tangentAtT: function(t) {\n\n            if (!this.isDifferentiable()) return null\n\n            if (t < 0) t = 0\n            else if (t > 1) t = 1\n\n            const skeletonPoints = this.getSkeletonPoints(t)\n\n            const p1 = skeletonPoints.startControlPoint2\n            const p2 = skeletonPoints.dividerControlPoint1\n\n            const tangentStart = skeletonPoints.divider\n\n            const tangentLine = new Line(p1, p2)\n            tangentLine.translate(tangentStart.x - p1.x, tangentStart.y - p1.y) // move so that tangent line starts at the point requested\n\n            return tangentLine\n        },\n\n        // Returns `t` at requested `ratio` with precision better than requested `opt.precision`; optionally using `opt.subdivisions` provided.\n        tAt: function(ratio, opt) {\n\n            if (ratio <= 0) return 0\n            if (ratio >= 1) return 1\n\n            opt = opt || {}\n            const precision = (opt.precision === undefined) ? this.PRECISION : opt.precision\n            const subdivisions = (opt.subdivisions === undefined) ? this.getSubdivisions({ precision: precision }) : opt.subdivisions\n            const localOpt = { precision: precision, subdivisions: subdivisions }\n\n            const curveLength = this.length(localOpt)\n            const length = curveLength * ratio\n\n            return this.tAtLength(length, localOpt)\n        },\n\n        // Returns `t` at requested `length` with precision better than requested `opt.precision`; optionally using `opt.subdivisions` provided.\n        // Uses `precision` to approximate length within `precision` (always underestimates)\n        // Then uses a binary search to find the `t` of a subdivision endpoint that is close (within `precision`) to the `length`, if the curve was as long as approximated\n        // As a rule of thumb, increasing `precision` by 1 causes the algorithm to go 2^(precision - 1) deeper\n        // - Precision 0 (chooses one of the two endpoints) - 0 levels\n        // - Precision 1 (chooses one of 5 points, <10% error) - 1 level\n        // - Precision 2 (<1% error) - 3 levels\n        // - Precision 3 (<0.1% error) - 7 levels\n        // - Precision 4 (<0.01% error) - 15 levels\n        tAtLength: function(length, opt) {\n\n            let fromStart = true\n            if (length < 0) {\n                fromStart = false // negative lengths mean start calculation from end point\n                length = -length // absolute value\n            }\n\n            opt = opt || {}\n            const precision = (opt.precision === undefined) ? this.PRECISION : opt.precision\n            const subdivisions = (opt.subdivisions === undefined) ? this.getSubdivisions({ precision: precision }) : opt.subdivisions\n            const localOpt = { precision: precision, subdivisions: subdivisions }\n\n            // identify the subdivision that contains the point at requested `length`:\n            let investigatedSubdivision\n            let investigatedSubdivisionStartT // assume that subdivisions are evenly spaced\n            let investigatedSubdivisionEndT\n            //var baseline; // straightened version of subdivision to investigate\n            //var baselinePoint; // point on the baseline that is the requested distance away from start\n            let baselinePointDistFromStart // distance of baselinePoint from start of baseline\n            let baselinePointDistFromEnd // distance of baselinePoint from end of baseline\n            let l = 0 // length so far\n            const n = subdivisions.length\n            let subdivisionSize = 1 / n\n            for (let i = (fromStart ? (0) : (n - 1)); (fromStart ? (i < n) : (i >= 0)); (fromStart ? (i++) : (i--))) {\n\n                const currentSubdivision = subdivisions[i]\n                const d = currentSubdivision.endpointDistance() // length of current subdivision\n\n                if (length <= (l + d)) {\n                    investigatedSubdivision = currentSubdivision\n\n                    investigatedSubdivisionStartT = i * subdivisionSize\n                    investigatedSubdivisionEndT = (i + 1) * subdivisionSize\n\n                    baselinePointDistFromStart = (fromStart ? (length - l) : ((d + l) - length))\n                    baselinePointDistFromEnd = (fromStart ? ((d + l) - length) : (length - l))\n\n                    break\n                }\n\n                l += d\n            }\n\n            if (!investigatedSubdivision) return (fromStart ? 1 : 0) // length requested is out of range - return maximum t\n            // note that precision affects what length is recorded\n            // (imprecise measurements underestimate length by up to 10^(-precision) of the precise length)\n            // e.g. at precision 1, the length may be underestimated by up to 10% and cause this function to return 1\n\n            const curveLength = this.length(localOpt)\n\n            const precisionRatio = pow(10, -precision)\n\n            // recursively divide investigated subdivision:\n            // until distance between baselinePoint and closest path endpoint is within 10^(-precision)\n            // then return the closest endpoint of that final subdivision\n            while (true) {\n\n                // check if we have reached required observed precision\n                var observedPrecisionRatio\n\n                observedPrecisionRatio = ((curveLength !== 0) ? (baselinePointDistFromStart / curveLength) : 0)\n                if (observedPrecisionRatio < precisionRatio) return investigatedSubdivisionStartT\n                observedPrecisionRatio = ((curveLength !== 0) ? (baselinePointDistFromEnd / curveLength) : 0)\n                if (observedPrecisionRatio < precisionRatio) return investigatedSubdivisionEndT\n\n                // otherwise, set up for next iteration\n                var newBaselinePointDistFromStart\n                var newBaselinePointDistFromEnd\n\n                const divided = investigatedSubdivision.divide(0.5)\n                subdivisionSize /= 2\n\n                const baseline1Length = divided[0].endpointDistance()\n                const baseline2Length = divided[1].endpointDistance()\n\n                if (baselinePointDistFromStart <= baseline1Length) { // point at requested length is inside divided[0]\n                    investigatedSubdivision = divided[0]\n\n                    investigatedSubdivisionEndT -= subdivisionSize // sudivisionSize was already halved\n\n                    newBaselinePointDistFromStart = baselinePointDistFromStart\n                    newBaselinePointDistFromEnd = baseline1Length - newBaselinePointDistFromStart\n\n                } else { // point at requested length is inside divided[1]\n                    investigatedSubdivision = divided[1]\n\n                    investigatedSubdivisionStartT += subdivisionSize // subdivisionSize was already halved\n\n                    newBaselinePointDistFromStart = baselinePointDistFromStart - baseline1Length\n                    newBaselinePointDistFromEnd = baseline2Length - newBaselinePointDistFromStart\n                }\n\n                baselinePointDistFromStart = newBaselinePointDistFromStart\n                baselinePointDistFromEnd = newBaselinePointDistFromEnd\n            }\n        },\n\n        translate: function(tx, ty) {\n\n            this.start.translate(tx, ty)\n            this.controlPoint1.translate(tx, ty)\n            this.controlPoint2.translate(tx, ty)\n            this.end.translate(tx, ty)\n            return this\n        },\n\n        // Returns an array of points that represents the curve when flattened, up to `opt.precision`; or using `opt.subdivisions` provided.\n        // Flattened length is no more than 10^(-precision) away from real curve length.\n        toPoints: function(opt) {\n\n            opt = opt || {}\n            const precision = (opt.precision === undefined) ? this.PRECISION : opt.precision // opt.precision only used in getSubdivisions() call\n            const subdivisions = (opt.subdivisions === undefined) ? this.getSubdivisions({ precision: precision }) : opt.subdivisions\n            // not using localOpt\n\n            const points = [subdivisions[0].start.clone()]\n            const n = subdivisions.length\n            for (let i = 0; i < n; i++) {\n\n                const currentSubdivision = subdivisions[i]\n                points.push(currentSubdivision.end.clone())\n            }\n\n            return points\n        },\n\n        // Returns a polyline that represents the curve when flattened, up to `opt.precision`; or using `opt.subdivisions` provided.\n        // Flattened length is no more than 10^(-precision) away from real curve length.\n        toPolyline: function(opt) {\n\n            return new Polyline(this.toPoints(opt))\n        },\n\n        toString: function() {\n\n            return `${this.start  } ${  this.controlPoint1  } ${  this.controlPoint2  } ${  this.end}`\n        }\n    }\n\n    var Ellipse = g.Ellipse = function(c, a, b) {\n\n        if (!(this instanceof Ellipse)) {\n            return new Ellipse(c, a, b)\n        }\n\n        if (c instanceof Ellipse) {\n            return new Ellipse(new Point(c.x, c.y), c.a, c.b)\n        }\n\n        c = new Point(c)\n        this.x = c.x\n        this.y = c.y\n        this.a = a\n        this.b = b\n    }\n\n    Ellipse.fromRect = function(rect) {\n\n        rect = new Rect(rect)\n        return new Ellipse(rect.center(), rect.width / 2, rect.height / 2)\n    }\n\n    Ellipse.prototype = {\n\n        bbox: function() {\n\n            return new Rect(this.x - this.a, this.y - this.b, 2 * this.a, 2 * this.b)\n        },\n\n        clone: function() {\n\n            return new Ellipse(this)\n        },\n\n        /**\n         * @param {g.Point} point\n         * @returns {number} result < 1 - inside ellipse, result == 1 - on ellipse boundary, result > 1 - outside\n         */\n        normalizedDistance: function(point) {\n\n            const x0 = point.x\n            const y0 = point.y\n            const {a} = this\n            const {b} = this\n            const {x} = this\n            const {y} = this\n\n            return ((x0 - x) * (x0 - x)) / (a * a ) + ((y0 - y) * (y0 - y)) / (b * b)\n        },\n\n        // inflate by dx and dy\n        // @param dx {delta_x} representing additional size to x\n        // @param dy {delta_y} representing additional size to y -\n        // dy param is not required -> in that case y is sized by dx\n        inflate: function(dx, dy) {\n            if (dx === undefined) {\n                dx = 0\n            }\n\n            if (dy === undefined) {\n                dy = dx\n            }\n\n            this.a += 2 * dx\n            this.b += 2 * dy\n\n            return this\n        },\n\n\n        /**\n         * @param {g.Point} p\n         * @returns {boolean}\n         */\n        containsPoint: function(p) {\n\n            return this.normalizedDistance(p) <= 1\n        },\n\n        /**\n         * @returns {g.Point}\n         */\n        center: function() {\n\n            return new Point(this.x, this.y)\n        },\n\n        /** Compute angle between tangent and x axis\n         * @param {g.Point} p Point of tangency, it has to be on ellipse boundaries.\n         * @returns {number} angle between tangent and x axis\n         */\n        tangentTheta: function(p) {\n\n            const refPointDelta = 30\n            const x0 = p.x\n            const y0 = p.y\n            const {a} = this\n            const {b} = this\n            const center = this.bbox().center()\n            const m = center.x\n            const n = center.y\n\n            const q1 = x0 > center.x + a / 2\n            const q3 = x0 < center.x - a / 2\n\n            let y; let x\n            if (q1 || q3) {\n                y = x0 > center.x ? y0 - refPointDelta : y0 + refPointDelta\n                x = (a * a / (x0 - m)) - (a * a * (y0 - n) * (y - n)) / (b * b * (x0 - m)) + m\n\n            } else {\n                x = y0 > center.y ? x0 + refPointDelta : x0 - refPointDelta\n                y = ( b * b / (y0 - n)) - (b * b * (x0 - m) * (x - m)) / (a * a * (y0 - n)) + n\n            }\n\n            return (new Point(x, y)).theta(p)\n\n        },\n\n        equals: function(ellipse) {\n\n            return !!ellipse &&\n                    ellipse.x === this.x &&\n                    ellipse.y === this.y &&\n                    ellipse.a === this.a &&\n                    ellipse.b === this.b\n        },\n\n        intersectionWithLine: function(line) {\n\n            const intersections = []\n            const a1 = line.start\n            const a2 = line.end\n            const rx = this.a\n            const ry = this.b\n            const dir = line.vector()\n            const diff = a1.difference(new Point(this))\n            const mDir = new Point(dir.x / (rx * rx), dir.y / (ry * ry))\n            const mDiff = new Point(diff.x / (rx * rx), diff.y / (ry * ry))\n\n            const a = dir.dot(mDir)\n            const b = dir.dot(mDiff)\n            const c = diff.dot(mDiff) - 1.0\n            const d = b * b - a * c\n\n            if (d < 0) {\n                return null\n            } else if (d > 0) {\n                const root = sqrt(d)\n                const ta = (-b - root) / a\n                const tb = (-b + root) / a\n\n                if ((ta < 0 || ta > 1) && (tb < 0 || tb > 1)) {\n                    // if ((ta < 0 && tb < 0) || (ta > 1 && tb > 1)) outside else inside\n                    return null\n                } else {\n                    if (ta >= 0 && ta <= 1) intersections.push(a1.lerp(a2, ta))\n                    if (tb >= 0 && tb <= 1) intersections.push(a1.lerp(a2, tb))\n                }\n            } else {\n                const t = -b / a\n                if (t >= 0 && t <= 1) {\n                    intersections.push(a1.lerp(a2, t))\n                } else {\n                    // outside\n                    return null\n                }\n            }\n\n            return intersections\n        },\n\n        // Find point on me where line from my center to\n        // point p intersects my boundary.\n        // @param {number} angle If angle is specified, intersection with rotated ellipse is computed.\n        intersectionWithLineFromCenterToPoint: function(p, angle) {\n\n            p = new Point(p)\n\n            if (angle) p.rotate(new Point(this.x, this.y), angle)\n\n            const dx = p.x - this.x\n            const dy = p.y - this.y\n            let result\n\n            if (dx === 0) {\n                result = this.bbox().pointNearestToPoint(p)\n                if (angle) return result.rotate(new Point(this.x, this.y), -angle)\n                return result\n            }\n\n            const m = dy / dx\n            const mSquared = m * m\n            const aSquared = this.a * this.a\n            const bSquared = this.b * this.b\n\n            let x = sqrt(1 / ((1 / aSquared) + (mSquared / bSquared)))\n            x = dx < 0 ? -x : x\n\n            const y = m * x\n            result = new Point(this.x + x, this.y + y)\n\n            if (angle) return result.rotate(new Point(this.x, this.y), -angle)\n            return result\n        },\n\n        toString: function() {\n\n            return `${(new Point(this.x, this.y)).toString()  } ${  this.a  } ${  this.b}`\n        }\n    }\n\n    var Line = g.Line = function(p1, p2) {\n\n        if (!(this instanceof Line)) {\n            return new Line(p1, p2)\n        }\n\n        if (p1 instanceof Line) {\n            return new Line(p1.start, p1.end)\n        }\n\n        this.start = new Point(p1)\n        this.end = new Point(p2)\n    }\n\n    Line.prototype = {\n\n        bbox: function() {\n\n            const left = min(this.start.x, this.end.x)\n            const top = min(this.start.y, this.end.y)\n            const right = max(this.start.x, this.end.x)\n            const bottom = max(this.start.y, this.end.y)\n\n            return new Rect(left, top, (right - left), (bottom - top))\n        },\n\n        // @return the bearing (cardinal direction) of the line. For example N, W, or SE.\n        // @returns {String} One of the following bearings : NE, E, SE, S, SW, W, NW, N.\n        bearing: function() {\n\n            const lat1 = toRad(this.start.y)\n            const lat2 = toRad(this.end.y)\n            const lon1 = this.start.x\n            const lon2 = this.end.x\n            const dLon = toRad(lon2 - lon1)\n            const y = sin(dLon) * cos(lat2)\n            const x = cos(lat1) * sin(lat2) - sin(lat1) * cos(lat2) * cos(dLon)\n            const brng = toDeg(atan2(y, x))\n\n            const bearings = ['NE', 'E', 'SE', 'S', 'SW', 'W', 'NW', 'N']\n\n            let index = brng - 22.5\n            if (index < 0)\n                index += 360\n            index = parseInt(index / 45)\n\n            return bearings[index]\n        },\n\n        clone: function() {\n\n            return new Line(this.start, this.end)\n        },\n\n        // @return {point} the closest point on the line to point `p`\n        closestPoint: function(p) {\n\n            return this.pointAt(this.closestPointNormalizedLength(p))\n        },\n\n        closestPointLength: function(p) {\n\n            return this.closestPointNormalizedLength(p) * this.length()\n        },\n\n        // @return {number} the normalized length of the closest point on the line to point `p`\n        closestPointNormalizedLength: function(p) {\n\n            const product = this.vector().dot((new Line(this.start, p)).vector())\n            const cpNormalizedLength = min(1, max(0, product / this.squaredLength()))\n\n            // cpNormalizedLength returns `NaN` if this line has zero length\n            // we can work with that - if `NaN`, return 0\n            if (cpNormalizedLength !== cpNormalizedLength) return 0 // condition evaluates to `true` if and only if cpNormalizedLength is `NaN`\n            // (`NaN` is the only value that is not equal to itself)\n\n            return cpNormalizedLength\n        },\n\n        closestPointTangent: function(p) {\n\n            return this.tangentAt(this.closestPointNormalizedLength(p))\n        },\n\n        equals: function(l) {\n\n            return !!l &&\n                    this.start.x === l.start.x &&\n                    this.start.y === l.start.y &&\n                    this.end.x === l.end.x &&\n                    this.end.y === l.end.y\n        },\n\n        intersectionWithLine: function(line) {\n\n            const pt1Dir = new Point(this.end.x - this.start.x, this.end.y - this.start.y)\n            const pt2Dir = new Point(line.end.x - line.start.x, line.end.y - line.start.y)\n            const det = (pt1Dir.x * pt2Dir.y) - (pt1Dir.y * pt2Dir.x)\n            const deltaPt = new Point(line.start.x - this.start.x, line.start.y - this.start.y)\n            const alpha = (deltaPt.x * pt2Dir.y) - (deltaPt.y * pt2Dir.x)\n            const beta = (deltaPt.x * pt1Dir.y) - (deltaPt.y * pt1Dir.x)\n\n            if (det === 0 || alpha * det < 0 || beta * det < 0) {\n                // No intersection found.\n                return null\n            }\n\n            if (det > 0) {\n                if (alpha > det || beta > det) {\n                    return null\n                }\n\n            } else if (alpha < det || beta < det) {\n                    return null\n                }\n\n            return [new Point(\n                this.start.x + (alpha * pt1Dir.x / det),\n                this.start.y + (alpha * pt1Dir.y / det)\n            )]\n        },\n\n        // @return {point} Point where I'm intersecting a line.\n        // @return [point] Points where I'm intersecting a rectangle.\n        // @see Squeak Smalltalk, LineSegment>>intersectionWith:\n        intersect: function(shape, opt) {\n\n            if (shape instanceof Line ||\n                shape instanceof Rect ||\n                shape instanceof Polyline ||\n                shape instanceof Ellipse ||\n                shape instanceof Path\n            ) {\n                let intersection = shape.intersectionWithLine(this, opt)\n\n                // Backwards compatibility\n                if (intersection && (shape instanceof Line)) {\n                    intersection = intersection[0]\n                }\n\n                return intersection\n            }\n\n            return null\n        },\n\n        isDifferentiable: function() {\n\n            return !this.start.equals(this.end)\n        },\n\n        // @return {double} length of the line\n        length: function() {\n\n            return sqrt(this.squaredLength())\n        },\n\n        // @return {point} my midpoint\n        midpoint: function() {\n\n            return new Point(\n                (this.start.x + this.end.x) / 2,\n                (this.start.y + this.end.y) / 2\n            )\n        },\n\n        // @return {point} my point at 't' <0,1>\n        pointAt: function(t) {\n\n            const {start} = this\n            const {end} = this\n\n            if (t <= 0) return start.clone()\n            if (t >= 1) return end.clone()\n\n            return start.lerp(end, t)\n        },\n\n        pointAtLength: function(length) {\n\n            const {start} = this\n            const {end} = this\n\n            let fromStart = true\n            if (length < 0) {\n                fromStart = false // negative lengths mean start calculation from end point\n                length = -length // absolute value\n            }\n\n            const lineLength = this.length()\n            if (length >= lineLength) return (fromStart ? end.clone() : start.clone())\n\n            return this.pointAt((fromStart ? (length) : (lineLength - length)) / lineLength)\n        },\n\n        // @return {number} the offset of the point `p` from the line. + if the point `p` is on the right side of the line, - if on the left and 0 if on the line.\n        pointOffset: function(p) {\n\n            // Find the sign of the determinant of vectors (start,end), where p is the query point.\n            p = new g.Point(p)\n            const {start} = this\n            const {end} = this\n            const determinant = ((end.x - start.x) * (p.y - start.y) - (end.y - start.y) * (p.x - start.x))\n\n            return determinant / this.length()\n        },\n\n        rotate: function(origin, angle) {\n\n            this.start.rotate(origin, angle)\n            this.end.rotate(origin, angle)\n            return this\n        },\n\n        round: function(precision) {\n\n            const f = pow(10, precision || 0)\n            this.start.x = round(this.start.x * f) / f\n            this.start.y = round(this.start.y * f) / f\n            this.end.x = round(this.end.x * f) / f\n            this.end.y = round(this.end.y * f) / f\n            return this\n        },\n\n        scale: function(sx, sy, origin) {\n\n            this.start.scale(sx, sy, origin)\n            this.end.scale(sx, sy, origin)\n            return this\n        },\n\n        // @return {number} scale the line so that it has the requested length\n        setLength: function(length) {\n\n            const currentLength = this.length()\n            if (!currentLength) return this\n\n            const scaleFactor = length / currentLength\n            return this.scale(scaleFactor, scaleFactor, this.start)\n        },\n\n        // @return {integer} length without sqrt\n        // @note for applications where the exact length is not necessary (e.g. compare only)\n        squaredLength: function() {\n\n            let x0 = this.start.x\n            let y0 = this.start.y\n            const x1 = this.end.x\n            const y1 = this.end.y\n            return (x0 -= x1) * x0 + (y0 -= y1) * y0\n        },\n\n        tangentAt: function(t) {\n\n            if (!this.isDifferentiable()) return null\n\n            const {start} = this\n            const {end} = this\n\n            const tangentStart = this.pointAt(t) // constrains `t` between 0 and 1\n\n            const tangentLine = new Line(start, end)\n            tangentLine.translate(tangentStart.x - start.x, tangentStart.y - start.y) // move so that tangent line starts at the point requested\n\n            return tangentLine\n        },\n\n        tangentAtLength: function(length) {\n\n            if (!this.isDifferentiable()) return null\n\n            const {start} = this\n            const {end} = this\n\n            const tangentStart = this.pointAtLength(length)\n\n            const tangentLine = new Line(start, end)\n            tangentLine.translate(tangentStart.x - start.x, tangentStart.y - start.y) // move so that tangent line starts at the point requested\n\n            return tangentLine\n        },\n\n        translate: function(tx, ty) {\n\n            this.start.translate(tx, ty)\n            this.end.translate(tx, ty)\n            return this\n        },\n\n        // @return vector {point} of the line\n        vector: function() {\n\n            return new Point(this.end.x - this.start.x, this.end.y - this.start.y)\n        },\n\n        toString: function() {\n\n            return `${this.start.toString()  } ${  this.end.toString()}`\n        }\n    }\n\n    // For backwards compatibility:\n    Line.prototype.intersection = Line.prototype.intersect\n\n    // Accepts path data string, array of segments, array of Curves and/or Lines, or a Polyline.\n    // Path created is not guaranteed to be a valid (serializable) path (might not start with an M).\n    var Path = g.Path = function(arg) {\n\n        if (!(this instanceof Path)) {\n            return new Path(arg)\n        }\n\n        if (typeof arg === 'string') { // create from a path data string\n            return new Path.parse(arg)\n        }\n\n        this.segments = []\n\n        let i\n        let n\n\n        if (!arg) {\n            // don't do anything\n\n        } else if (Array.isArray(arg) && arg.length !== 0) { // if arg is a non-empty array\n            n = arg.length\n            if (arg[0].isSegment) { // create from an array of segments\n                for (i = 0; i < n; i++) {\n\n                    const segment = arg[i]\n\n                    this.appendSegment(segment)\n                }\n\n            } else { // create from an array of Curves and/or Lines\n                let previousObj = null\n                for (i = 0; i < n; i++) {\n\n                    const obj = arg[i]\n\n                    if (!((obj instanceof Line) || (obj instanceof Curve))) {\n                        throw new Error('Cannot construct a path segment from the provided object.')\n                    }\n\n                    if (i === 0) this.appendSegment(Path.createSegment('M', obj.start))\n\n                    // if objects do not link up, moveto segments are inserted to cover the gaps\n                    if (previousObj && !previousObj.end.equals(obj.start)) this.appendSegment(Path.createSegment('M', obj.start))\n\n                    if (obj instanceof Line) {\n                        this.appendSegment(Path.createSegment('L', obj.end))\n\n                    } else if (obj instanceof Curve) {\n                        this.appendSegment(Path.createSegment('C', obj.controlPoint1, obj.controlPoint2, obj.end))\n                    }\n\n                    previousObj = obj\n                }\n            }\n\n        } else if (arg.isSegment) { // create from a single segment\n            this.appendSegment(arg)\n\n        } else if (arg instanceof Line) { // create from a single Line\n            this.appendSegment(Path.createSegment('M', arg.start))\n            this.appendSegment(Path.createSegment('L', arg.end))\n\n        } else if (arg instanceof Curve) { // create from a single Curve\n            this.appendSegment(Path.createSegment('M', arg.start))\n            this.appendSegment(Path.createSegment('C', arg.controlPoint1, arg.controlPoint2, arg.end))\n\n        } else if (arg instanceof Polyline && arg.points && arg.points.length !== 0) { // create from a Polyline\n            n = arg.points.length\n            for (i = 0; i < n; i++) {\n\n                const point = arg.points[i]\n\n                if (i === 0) this.appendSegment(Path.createSegment('M', point))\n                else this.appendSegment(Path.createSegment('L', point))\n            }\n        }\n    }\n\n    // More permissive than V.normalizePathData and Path.prototype.serialize.\n    // Allows path data strings that do not start with a Moveto command (unlike SVG specification).\n    // Does not require spaces between elements; commas are allowed, separators may be omitted when unambiguous (e.g. 'ZM10,10', 'L1.6.8', 'M100-200').\n    // Allows for command argument chaining.\n    // Throws an error if wrong number of arguments is provided with a command.\n    // Throws an error if an unrecognized path command is provided (according to Path.segmentTypes). Only a subset of SVG commands is currently supported (L, C, M, Z).\n    Path.parse = function(pathData) {\n\n        if (!pathData) return new Path()\n\n        const path = new Path()\n\n        const commandRe = /(?:[a-zA-Z] *)(?:(?:-?\\d+(?:\\.\\d+)? *,? *)|(?:-?\\.\\d+ *,? *))+|(?:[a-zA-Z] *)(?! |\\d|-|\\.)/g\n        const commands = pathData.match(commandRe)\n\n        const numCommands = commands.length\n        for (let i = 0; i < numCommands; i++) {\n\n            const command = commands[i]\n            const argRe = /(?:[a-zA-Z])|(?:(?:-?\\d+(?:\\.\\d+)?))|(?:(?:-?\\.\\d+))/g\n            const args = command.match(argRe)\n\n            const segment = Path.createSegment.apply(this, args) // args = [type, coordinate1, coordinate2...]\n            path.appendSegment(segment)\n        }\n\n        return path\n    }\n\n    // Create a segment or an array of segments.\n    // Accepts unlimited points/coords arguments after `type`.\n    Path.createSegment = function(type) {\n\n        if (!type) throw new Error('Type must be provided.')\n\n        const segmentConstructor = Path.segmentTypes[type]\n        if (!segmentConstructor) throw new Error(`${type  } is not a recognized path segment type.`)\n\n        const args = []\n        const n = arguments.length\n        for (let i = 1; i < n; i++) { // do not add first element (`type`) to args array\n            args.push(arguments[i])\n        }\n\n        return applyToNew(segmentConstructor, args)\n    },\n\n    Path.prototype = {\n\n        // Accepts one segment or an array of segments as argument.\n        // Throws an error if argument is not a segment or an array of segments.\n        appendSegment: function(arg) {\n\n            const {segments} = this\n            const numSegments = segments.length\n            // works even if path has no segments\n\n            let currentSegment\n\n            let previousSegment = ((numSegments !== 0) ? segments[numSegments - 1] : null) // if we are appending to an empty path, previousSegment is null\n            const nextSegment = null\n\n            if (!Array.isArray(arg)) { // arg is a segment\n                if (!arg || !arg.isSegment) throw new Error('Segment required.')\n\n                currentSegment = this.prepareSegment(arg, previousSegment, nextSegment)\n                segments.push(currentSegment)\n\n            } else { // arg is an array of segments\n                if (!arg[0].isSegment) throw new Error('Segments required.')\n\n                const n = arg.length\n                for (let i = 0; i < n; i++) {\n\n                    const currentArg = arg[i]\n                    currentSegment = this.prepareSegment(currentArg, previousSegment, nextSegment)\n                    segments.push(currentSegment)\n                    previousSegment = currentSegment\n                }\n            }\n        },\n\n        // Returns the bbox of the path.\n        // If path has no segments, returns null.\n        // If path has only invisible segments, returns bbox of the end point of last segment.\n        bbox: function() {\n\n            const {segments} = this\n            const numSegments = segments.length\n            if (numSegments === 0) return null // if segments is an empty array\n\n            let bbox\n            for (let i = 0; i < numSegments; i++) {\n\n                const segment = segments[i]\n                if (segment.isVisible) {\n                    const segmentBBox = segment.bbox()\n                    bbox = bbox ? bbox.union(segmentBBox) : segmentBBox\n                }\n            }\n\n            if (bbox) return bbox\n\n            // if the path has only invisible elements, return end point of last segment\n            const lastSegment = segments[numSegments - 1]\n            return new Rect(lastSegment.end.x, lastSegment.end.y, 0, 0)\n        },\n\n        // Returns a new path that is a clone of this path.\n        clone: function() {\n\n            const {segments} = this\n            const numSegments = segments.length\n            // works even if path has no segments\n\n            const path = new Path()\n            for (let i = 0; i < numSegments; i++) {\n\n                const segment = segments[i].clone()\n                path.appendSegment(segment)\n            }\n\n            return path\n        },\n\n        closestPoint: function(p, opt) {\n\n            const t = this.closestPointT(p, opt)\n            if (!t) return null\n\n            return this.pointAtT(t)\n        },\n\n        closestPointLength: function(p, opt) {\n\n            opt = opt || {}\n            const precision = (opt.precision === undefined) ? this.PRECISION : opt.precision\n            const segmentSubdivisions = (opt.segmentSubdivisions === undefined) ? this.getSegmentSubdivisions({ precision: precision }) : opt.segmentSubdivisions\n            const localOpt = { precision: precision, segmentSubdivisions: segmentSubdivisions }\n\n            const t = this.closestPointT(p, localOpt)\n            if (!t) return 0\n\n            return this.lengthAtT(t, localOpt)\n        },\n\n        closestPointNormalizedLength: function(p, opt) {\n\n            opt = opt || {}\n            const precision = (opt.precision === undefined) ? this.PRECISION : opt.precision\n            const segmentSubdivisions = (opt.segmentSubdivisions === undefined) ? this.getSegmentSubdivisions({ precision: precision }) : opt.segmentSubdivisions\n            const localOpt = { precision: precision, segmentSubdivisions: segmentSubdivisions }\n\n            const cpLength = this.closestPointLength(p, localOpt)\n            if (cpLength === 0) return 0 // shortcut\n\n            const length = this.length(localOpt)\n            if (length === 0) return 0 // prevents division by zero\n\n            return cpLength / length\n        },\n\n        // Private function.\n        closestPointT: function(p, opt) {\n\n            const {segments} = this\n            const numSegments = segments.length\n            if (numSegments === 0) return null // if segments is an empty array\n\n            opt = opt || {}\n            const precision = (opt.precision === undefined) ? this.PRECISION : opt.precision\n            const segmentSubdivisions = (opt.segmentSubdivisions === undefined) ? this.getSegmentSubdivisions({ precision: precision }) : opt.segmentSubdivisions\n            // not using localOpt\n\n            let closestPointT\n            let minSquaredDistance = Infinity\n            for (let i = 0; i < numSegments; i++) {\n\n                const segment = segments[i]\n                const subdivisions = segmentSubdivisions[i]\n\n                if (segment.isVisible) {\n                    const segmentClosestPointT = segment.closestPointT(p, { precision: precision, subdivisions: subdivisions })\n                    const segmentClosestPoint = segment.pointAtT(segmentClosestPointT)\n                    const squaredDistance = (new Line(segmentClosestPoint, p)).squaredLength()\n\n                    if (squaredDistance < minSquaredDistance) {\n                        closestPointT = { segmentIndex: i, value: segmentClosestPointT }\n                        minSquaredDistance = squaredDistance\n                    }\n                }\n            }\n\n            if (closestPointT) return closestPointT\n\n            // if no visible segment, return end of last segment\n            return { segmentIndex: numSegments - 1, value: 1 }\n        },\n\n        closestPointTangent: function(p, opt) {\n\n            const {segments} = this\n            const numSegments = segments.length\n            if (numSegments === 0) return null // if segments is an empty array\n\n            opt = opt || {}\n            const precision = (opt.precision === undefined) ? this.PRECISION : opt.precision\n            const segmentSubdivisions = (opt.segmentSubdivisions === undefined) ? this.getSegmentSubdivisions({ precision: precision }) : opt.segmentSubdivisions\n            // not using localOpt\n\n            let closestPointTangent\n            let minSquaredDistance = Infinity\n            for (let i = 0; i < numSegments; i++) {\n\n                const segment = segments[i]\n                const subdivisions = segmentSubdivisions[i]\n\n                if (segment.isDifferentiable()) {\n                    const segmentClosestPointT = segment.closestPointT(p, { precision: precision, subdivisions: subdivisions })\n                    const segmentClosestPoint = segment.pointAtT(segmentClosestPointT)\n                    const squaredDistance = (new Line(segmentClosestPoint, p)).squaredLength()\n\n                    if (squaredDistance < minSquaredDistance) {\n                        closestPointTangent = segment.tangentAtT(segmentClosestPointT)\n                        minSquaredDistance = squaredDistance\n                    }\n                }\n            }\n\n            if (closestPointTangent) return closestPointTangent\n\n            // if no valid segment, return null\n            return null\n        },\n\n        // Checks whether two paths are exactly the same.\n        // If `p` is undefined or null, returns false.\n        equals: function(p) {\n\n            if (!p) return false\n\n            const {segments} = this\n            const otherSegments = p.segments\n\n            const numSegments = segments.length\n            if (otherSegments.length !== numSegments) return false // if the two paths have different number of segments, they cannot be equal\n\n            for (let i = 0; i < numSegments; i++) {\n\n                const segment = segments[i]\n                const otherSegment = otherSegments[i]\n\n                // as soon as an inequality is found in segments, return false\n                if ((segment.type !== otherSegment.type) || (!segment.equals(otherSegment))) return false\n            }\n\n            // if no inequality found in segments, return true\n            return true\n        },\n\n        // Accepts negative indices.\n        // Throws an error if path has no segments.\n        // Throws an error if index is out of range.\n        getSegment: function(index) {\n\n            const {segments} = this\n            const numSegments = segments.length\n            if (!numSegments === 0) throw new Error('Path has no segments.')\n\n            if (index < 0) index = numSegments + index // convert negative indices to positive\n            if (index >= numSegments || index < 0) throw new Error('Index out of range.')\n\n            return segments[index]\n        },\n\n        // Returns an array of segment subdivisions, with precision better than requested `opt.precision`.\n        getSegmentSubdivisions: function(opt) {\n\n            const {segments} = this\n            const numSegments = segments.length\n            // works even if path has no segments\n\n            opt = opt || {}\n            const precision = (opt.precision === undefined) ? this.PRECISION : opt.precision\n            // not using opt.segmentSubdivisions\n            // not using localOpt\n\n            const segmentSubdivisions = []\n            for (let i = 0; i < numSegments; i++) {\n\n                const segment = segments[i]\n                const subdivisions = segment.getSubdivisions({ precision: precision })\n                segmentSubdivisions.push(subdivisions)\n            }\n\n            return segmentSubdivisions\n        },\n\n        // Insert `arg` at given `index`.\n        // `index = 0` means insert at the beginning.\n        // `index = segments.length` means insert at the end.\n        // Accepts negative indices, from `-1` to `-(segments.length + 1)`.\n        // Accepts one segment or an array of segments as argument.\n        // Throws an error if index is out of range.\n        // Throws an error if argument is not a segment or an array of segments.\n        insertSegment: function(index, arg) {\n\n            const {segments} = this\n            const numSegments = segments.length\n            // works even if path has no segments\n\n            // note that these are incremented comapared to getSegments()\n            // we can insert after last element (note that this changes the meaning of index -1)\n            if (index < 0) index = numSegments + index + 1 // convert negative indices to positive\n            if (index > numSegments || index < 0) throw new Error('Index out of range.')\n\n            let currentSegment\n\n            let previousSegment = null\n            let nextSegment = null\n\n            if (numSegments !== 0) {\n                if (index >= 1) {\n                    previousSegment = segments[index - 1]\n                    nextSegment = previousSegment.nextSegment // if we are inserting at end, nextSegment is null\n\n                } else { // if index === 0\n                    // previousSegment is null\n                    nextSegment = segments[0]\n                }\n            }\n\n            if (!Array.isArray(arg)) {\n                if (!arg || !arg.isSegment) throw new Error('Segment required.')\n\n                currentSegment = this.prepareSegment(arg, previousSegment, nextSegment)\n                segments.splice(index, 0, currentSegment)\n\n            } else {\n                if (!arg[0].isSegment) throw new Error('Segments required.')\n\n                const n = arg.length\n                for (let i = 0; i < n; i++) {\n\n                    const currentArg = arg[i]\n                    currentSegment = this.prepareSegment(currentArg, previousSegment, nextSegment)\n                    segments.splice((index + i), 0, currentSegment) // incrementing index to insert subsequent segments after inserted segments\n                    previousSegment = currentSegment\n                }\n            }\n        },\n\n        isDifferentiable: function() {\n\n            const {segments} = this\n            const numSegments = segments.length\n\n            for (let i = 0; i < numSegments; i++) {\n\n                const segment = segments[i]\n                // as soon as a differentiable segment is found in segments, return true\n                if (segment.isDifferentiable()) return true\n            }\n\n            // if no differentiable segment is found in segments, return false\n            return false\n        },\n\n        // Checks whether current path segments are valid.\n        // Note that d is allowed to be empty - should disable rendering of the path.\n        isValid: function() {\n\n            const {segments} = this\n            const isValid = (segments.length === 0) || (segments[0].type === 'M') // either empty or first segment is a Moveto\n            return isValid\n        },\n\n        // Returns length of the path, with precision better than requested `opt.precision`; or using `opt.segmentSubdivisions` provided.\n        // If path has no segments, returns 0.\n        length: function(opt) {\n\n            const {segments} = this\n            const numSegments = segments.length\n            if (numSegments === 0) return 0 // if segments is an empty array\n\n            opt = opt || {}\n            const precision = (opt.precision === undefined) ? this.PRECISION : opt.precision // opt.precision only used in getSegmentSubdivisions() call\n            const segmentSubdivisions = (opt.segmentSubdivisions === undefined) ? this.getSegmentSubdivisions({ precision: precision }) : opt.segmentSubdivisions\n            // not using localOpt\n\n            let length = 0\n            for (let i = 0; i < numSegments; i++) {\n\n                const segment = segments[i]\n                const subdivisions = segmentSubdivisions[i]\n                length += segment.length({ subdivisions: subdivisions })\n            }\n\n            return length\n        },\n\n        // Private function.\n        lengthAtT: function(t, opt) {\n\n            const {segments} = this\n            const numSegments = segments.length\n            if (numSegments === 0) return 0 // if segments is an empty array\n\n            let {segmentIndex} = t\n            if (segmentIndex < 0) return 0 // regardless of t.value\n\n            let tValue = t.value\n            if (segmentIndex >= numSegments) {\n                segmentIndex = numSegments - 1\n                tValue = 1\n            }\n            else if (tValue < 0) tValue = 0\n            else if (tValue > 1) tValue = 1\n\n            opt = opt || {}\n            const precision = (opt.precision === undefined) ? this.PRECISION : opt.precision\n            const segmentSubdivisions = (opt.segmentSubdivisions === undefined) ? this.getSegmentSubdivisions({ precision: precision }) : opt.segmentSubdivisions\n            // not using localOpt\n\n            let subdivisions\n            let length = 0\n            for (let i = 0; i < segmentIndex; i++) {\n\n                var segment = segments[i]\n                subdivisions = segmentSubdivisions[i]\n                length += segment.length({ precisison: precision, subdivisions: subdivisions })\n            }\n\n            segment = segments[segmentIndex]\n            subdivisions = segmentSubdivisions[segmentIndex]\n            length += segment.lengthAtT(tValue, { precisison: precision, subdivisions: subdivisions })\n\n            return length\n        },\n\n        // Returns point at requested `ratio` between 0 and 1, with precision better than requested `opt.precision`; optionally using `opt.segmentSubdivisions` provided.\n        pointAt: function(ratio, opt) {\n\n            const {segments} = this\n            const numSegments = segments.length\n            if (numSegments === 0) return null // if segments is an empty array\n\n            if (ratio <= 0) return this.start.clone()\n            if (ratio >= 1) return this.end.clone()\n\n            opt = opt || {}\n            const precision = (opt.precision === undefined) ? this.PRECISION : opt.precision\n            const segmentSubdivisions = (opt.segmentSubdivisions === undefined) ? this.getSegmentSubdivisions({ precision: precision }) : opt.segmentSubdivisions\n            const localOpt = { precision: precision, segmentSubdivisions: segmentSubdivisions }\n\n            const pathLength = this.length(localOpt)\n            const length = pathLength * ratio\n\n            return this.pointAtLength(length, localOpt)\n        },\n\n        // Returns point at requested `length`, with precision better than requested `opt.precision`; optionally using `opt.segmentSubdivisions` provided.\n        // Accepts negative length.\n        pointAtLength: function(length, opt) {\n\n            const {segments} = this\n            const numSegments = segments.length\n            if (numSegments === 0) return null // if segments is an empty array\n\n            if (length === 0) return this.start.clone()\n\n            let fromStart = true\n            if (length < 0) {\n                fromStart = false // negative lengths mean start calculation from end point\n                length = -length // absolute value\n            }\n\n            opt = opt || {}\n            const precision = (opt.precision === undefined) ? this.PRECISION : opt.precision\n            const segmentSubdivisions = (opt.segmentSubdivisions === undefined) ? this.getSegmentSubdivisions({ precision: precision }) : opt.segmentSubdivisions\n            // not using localOpt\n\n            let lastVisibleSegment\n            let l = 0 // length so far\n            for (let i = (fromStart ? 0 : (numSegments - 1)); (fromStart ? (i < numSegments) : (i >= 0)); (fromStart ? (i++) : (i--))) {\n\n                const segment = segments[i]\n                const subdivisions = segmentSubdivisions[i]\n                const d = segment.length({ precision: precision, subdivisions: subdivisions })\n\n                if (segment.isVisible) {\n                    if (length <= (l + d)) {\n                        return segment.pointAtLength(((fromStart ? 1 : -1) * (length - l)), { precision: precision, subdivisions: subdivisions })\n                    }\n\n                    lastVisibleSegment = segment\n                }\n\n                l += d\n            }\n\n            // if length requested is higher than the length of the path, return last visible segment endpoint\n            if (lastVisibleSegment) return (fromStart ? lastVisibleSegment.end : lastVisibleSegment.start)\n\n            // if no visible segment, return last segment end point (no matter if fromStart or no)\n            const lastSegment = segments[numSegments - 1]\n            return lastSegment.end.clone()\n        },\n\n        // Private function.\n        pointAtT: function(t) {\n\n            const {segments} = this\n            const numSegments = segments.length\n            if (numSegments === 0) return null // if segments is an empty array\n\n            const {segmentIndex} = t\n            if (segmentIndex < 0) return segments[0].pointAtT(0)\n            if (segmentIndex >= numSegments) return segments[numSegments - 1].pointAtT(1)\n\n            let tValue = t.value\n            if (tValue < 0) tValue = 0\n            else if (tValue > 1) tValue = 1\n\n            return segments[segmentIndex].pointAtT(tValue)\n        },\n\n        // Helper method for adding segments.\n        prepareSegment: function(segment, previousSegment, nextSegment) {\n\n            // insert after previous segment and before previous segment's next segment\n            segment.previousSegment = previousSegment\n            segment.nextSegment = nextSegment\n            if (previousSegment) previousSegment.nextSegment = segment\n            if (nextSegment) nextSegment.previousSegment = segment\n\n            let updateSubpathStart = segment\n            if (segment.isSubpathStart) {\n                segment.subpathStartSegment = segment // assign self as subpath start segment\n                updateSubpathStart = nextSegment // start updating from next segment\n            }\n\n            // assign previous segment's subpath start (or self if it is a subpath start) to subsequent segments\n            if (updateSubpathStart) this.updateSubpathStartSegment(updateSubpathStart)\n\n            return segment\n        },\n\n        // Default precision\n        PRECISION: 3,\n\n        // Remove the segment at `index`.\n        // Accepts negative indices, from `-1` to `-segments.length`.\n        // Throws an error if path has no segments.\n        // Throws an error if index is out of range.\n        removeSegment: function(index) {\n\n            const {segments} = this\n            const numSegments = segments.length\n            if (numSegments === 0) throw new Error('Path has no segments.')\n\n            if (index < 0) index = numSegments + index // convert negative indices to positive\n            if (index >= numSegments || index < 0) throw new Error('Index out of range.')\n\n            const removedSegment = segments.splice(index, 1)[0]\n            const {previousSegment} = removedSegment\n            const {nextSegment} = removedSegment\n\n            // link the previous and next segments together (if present)\n            if (previousSegment) previousSegment.nextSegment = nextSegment // may be null\n            if (nextSegment) nextSegment.previousSegment = previousSegment // may be null\n\n            // if removed segment used to start a subpath, update all subsequent segments until another subpath start segment is reached\n            if (removedSegment.isSubpathStart && nextSegment) this.updateSubpathStartSegment(nextSegment)\n        },\n\n        // Replace the segment at `index` with `arg`.\n        // Accepts negative indices, from `-1` to `-segments.length`.\n        // Accepts one segment or an array of segments as argument.\n        // Throws an error if path has no segments.\n        // Throws an error if index is out of range.\n        // Throws an error if argument is not a segment or an array of segments.\n        replaceSegment: function(index, arg) {\n\n            const {segments} = this\n            const numSegments = segments.length\n            if (numSegments === 0) throw new Error('Path has no segments.')\n\n            if (index < 0) index = numSegments + index // convert negative indices to positive\n            if (index >= numSegments || index < 0) throw new Error('Index out of range.')\n\n            let currentSegment\n\n            const replacedSegment = segments[index]\n            let {previousSegment} = replacedSegment\n            const {nextSegment} = replacedSegment\n\n            let updateSubpathStart = replacedSegment.isSubpathStart // boolean: is an update of subpath starts necessary?\n\n            if (!Array.isArray(arg)) {\n                if (!arg || !arg.isSegment) throw new Error('Segment required.')\n\n                currentSegment = this.prepareSegment(arg, previousSegment, nextSegment)\n                segments.splice(index, 1, currentSegment) // directly replace\n\n                if (updateSubpathStart && currentSegment.isSubpathStart) updateSubpathStart = false // already updated by `prepareSegment`\n\n            } else {\n                if (!arg[0].isSegment) throw new Error('Segments required.')\n\n                segments.splice(index, 1)\n\n                const n = arg.length\n                for (let i = 0; i < n; i++) {\n\n                    const currentArg = arg[i]\n                    currentSegment = this.prepareSegment(currentArg, previousSegment, nextSegment)\n                    segments.splice((index + i), 0, currentSegment) // incrementing index to insert subsequent segments after inserted segments\n                    previousSegment = currentSegment\n\n                    if (updateSubpathStart && currentSegment.isSubpathStart) updateSubpathStart = false // already updated by `prepareSegment`\n                }\n            }\n\n            // if replaced segment used to start a subpath and no new subpath start was added, update all subsequent segments until another subpath start segment is reached\n            if (updateSubpathStart && nextSegment) this.updateSubpathStartSegment(nextSegment)\n        },\n\n        scale: function(sx, sy, origin) {\n\n            const {segments} = this\n            const numSegments = segments.length\n\n            for (let i = 0; i < numSegments; i++) {\n\n                const segment = segments[i]\n                segment.scale(sx, sy, origin)\n            }\n\n            return this\n        },\n\n        segmentAt: function(ratio, opt) {\n\n            const index = this.segmentIndexAt(ratio, opt)\n            if (!index) return null\n\n            return this.getSegment(index)\n        },\n\n        // Accepts negative length.\n        segmentAtLength: function(length, opt) {\n\n            const index = this.segmentIndexAtLength(length, opt)\n            if (!index) return null\n\n            return this.getSegment(index)\n        },\n\n        segmentIndexAt: function(ratio, opt) {\n\n            const {segments} = this\n            const numSegments = segments.length\n            if (numSegments === 0) return null // if segments is an empty array\n\n            if (ratio < 0) ratio = 0\n            if (ratio > 1) ratio = 1\n\n            opt = opt || {}\n            const precision = (opt.precision === undefined) ? this.PRECISION : opt.precision\n            const segmentSubdivisions = (opt.segmentSubdivisions === undefined) ? this.getSegmentSubdivisions({ precision: precision }) : opt.segmentSubdivisions\n            const localOpt = { precision: precision, segmentSubdivisions: segmentSubdivisions }\n\n            const pathLength = this.length(localOpt)\n            const length = pathLength * ratio\n\n            return this.segmentIndexAtLength(length, localOpt)\n        },\n\n        toPoints: function(opt) {\n\n            const {segments} = this\n            const numSegments = segments.length\n            if (numSegments === 0) return null // if segments is an empty array\n\n            opt = opt || {}\n            const precision = (opt.precision === undefined) ? this.PRECISION : opt.precision\n            const segmentSubdivisions = (opt.segmentSubdivisions === undefined) ? this.getSegmentSubdivisions({ precision: precision }) : opt.segmentSubdivisions\n\n            const points = []\n            let partialPoints = []\n            for (let i = 0; i < numSegments; i++) {\n                const segment = segments[i]\n                if (segment.isVisible) {\n                    const currentSegmentSubdivisions = segmentSubdivisions[i]\n                    if (currentSegmentSubdivisions.length > 0) {\n                        const subdivisionPoints = currentSegmentSubdivisions.map(function(curve) {\n                            return curve.start\n                        })\n                        Array.prototype.push.apply(partialPoints, subdivisionPoints)\n                    } else {\n                        partialPoints.push(segment.start)\n                    }\n                } else if (partialPoints.length > 0) {\n                    partialPoints.push(segments[i - 1].end)\n                    points.push(partialPoints)\n                    partialPoints = []\n                }\n            }\n\n            if (partialPoints.length > 0) {\n                partialPoints.push(this.end)\n                points.push(partialPoints)\n            }\n            return points\n        },\n\n        toPolylines: function(opt) {\n\n            const polylines = []\n            const points = this.toPoints(opt)\n            if (!points) return null\n            for (let i = 0, n = points.length; i < n; i++) {\n                polylines.push(new Polyline(points[i]))\n            }\n\n            return polylines\n        },\n\n        intersectionWithLine: function(line, opt) {\n\n            let intersection = null\n            const polylines = this.toPolylines(opt)\n            if (!polylines) return null\n            for (let i = 0, n = polylines.length; i < n; i++) {\n                const polyline = polylines[i]\n                const polylineIntersection = line.intersect(polyline)\n                if (polylineIntersection) {\n                    intersection || (intersection = [])\n                    if (Array.isArray(polylineIntersection)) {\n                        Array.prototype.push.apply(intersection, polylineIntersection)\n                    } else {\n                        intersection.push(polylineIntersection)\n                    }\n                }\n            }\n\n            return intersection\n        },\n\n        // Accepts negative length.\n        segmentIndexAtLength: function(length, opt) {\n\n            const {segments} = this\n            const numSegments = segments.length\n            if (numSegments === 0) return null // if segments is an empty array\n\n            let fromStart = true\n            if (length < 0) {\n                fromStart = false // negative lengths mean start calculation from end point\n                length = -length // absolute value\n            }\n\n            opt = opt || {}\n            const precision = (opt.precision === undefined) ? this.PRECISION : opt.precision\n            const segmentSubdivisions = (opt.segmentSubdivisions === undefined) ? this.getSegmentSubdivisions({ precision: precision }) : opt.segmentSubdivisions\n            // not using localOpt\n\n            let lastVisibleSegmentIndex = null\n            let l = 0 // length so far\n            for (let i = (fromStart ? 0 : (numSegments - 1)); (fromStart ? (i < numSegments) : (i >= 0)); (fromStart ? (i++) : (i--))) {\n\n                const segment = segments[i]\n                const subdivisions = segmentSubdivisions[i]\n                const d = segment.length({ precision: precision, subdivisions: subdivisions })\n\n                if (segment.isVisible) {\n                    if (length <= (l + d)) return i\n                    lastVisibleSegmentIndex = i\n                }\n\n                l += d\n            }\n\n            // if length requested is higher than the length of the path, return last visible segment index\n            // if no visible segment, return null\n            return lastVisibleSegmentIndex\n        },\n\n        // Returns tangent line at requested `ratio` between 0 and 1, with precision better than requested `opt.precision`; optionally using `opt.segmentSubdivisions` provided.\n        tangentAt: function(ratio, opt) {\n\n            const {segments} = this\n            const numSegments = segments.length\n            if (numSegments === 0) return null // if segments is an empty array\n\n            if (ratio < 0) ratio = 0\n            if (ratio > 1) ratio = 1\n\n            opt = opt || {}\n            const precision = (opt.precision === undefined) ? this.PRECISION : opt.precision\n            const segmentSubdivisions = (opt.segmentSubdivisions === undefined) ? this.getSegmentSubdivisions({ precision: precision }) : opt.segmentSubdivisions\n            const localOpt = { precision: precision, segmentSubdivisions: segmentSubdivisions }\n\n            const pathLength = this.length(localOpt)\n            const length = pathLength * ratio\n\n            return this.tangentAtLength(length, localOpt)\n        },\n\n        // Returns tangent line at requested `length`, with precision better than requested `opt.precision`; optionally using `opt.segmentSubdivisions` provided.\n        // Accepts negative length.\n        tangentAtLength: function(length, opt) {\n\n            const {segments} = this\n            const numSegments = segments.length\n            if (numSegments === 0) return null // if segments is an empty array\n\n            let fromStart = true\n            if (length < 0) {\n                fromStart = false // negative lengths mean start calculation from end point\n                length = -length // absolute value\n            }\n\n            opt = opt || {}\n            const precision = (opt.precision === undefined) ? this.PRECISION : opt.precision\n            const segmentSubdivisions = (opt.segmentSubdivisions === undefined) ? this.getSegmentSubdivisions({ precision: precision }) : opt.segmentSubdivisions\n            // not using localOpt\n\n            let lastValidSegment // visible AND differentiable (with a tangent)\n            let l = 0 // length so far\n            for (let i = (fromStart ? 0 : (numSegments - 1)); (fromStart ? (i < numSegments) : (i >= 0)); (fromStart ? (i++) : (i--))) {\n\n                const segment = segments[i]\n                const subdivisions = segmentSubdivisions[i]\n                const d = segment.length({ precision: precision, subdivisions: subdivisions })\n\n                if (segment.isDifferentiable()) {\n                    if (length <= (l + d)) {\n                        return segment.tangentAtLength(((fromStart ? 1 : -1) * (length - l)), { precision: precision, subdivisions: subdivisions })\n                    }\n\n                    lastValidSegment = segment\n                }\n\n                l += d\n            }\n\n            // if length requested is higher than the length of the path, return tangent of endpoint of last valid segment\n            if (lastValidSegment) {\n                const t = (fromStart ? 1 : 0)\n                return lastValidSegment.tangentAtT(t)\n            }\n\n            // if no valid segment, return null\n            return null\n        },\n\n        // Private function.\n        tangentAtT: function(t) {\n\n            const {segments} = this\n            const numSegments = segments.length\n            if (numSegments === 0) return null // if segments is an empty array\n\n            const {segmentIndex} = t\n            if (segmentIndex < 0) return segments[0].tangentAtT(0)\n            if (segmentIndex >= numSegments) return segments[numSegments - 1].tangentAtT(1)\n\n            let tValue = t.value\n            if (tValue < 0) tValue = 0\n            else if (tValue > 1) tValue = 1\n\n            return segments[segmentIndex].tangentAtT(tValue)\n        },\n\n        translate: function(tx, ty) {\n\n            const {segments} = this\n            const numSegments = segments.length\n\n            for (let i = 0; i < numSegments; i++) {\n\n                const segment = segments[i]\n                segment.translate(tx, ty)\n            }\n\n            return this\n        },\n\n        // Helper method for updating subpath start of segments, starting with the one provided.\n        updateSubpathStartSegment: function(segment) {\n\n            let {previousSegment} = segment // may be null\n            while (segment && !segment.isSubpathStart) {\n\n                // assign previous segment's subpath start segment to this segment\n                if (previousSegment) segment.subpathStartSegment = previousSegment.subpathStartSegment // may be null\n                else segment.subpathStartSegment = null // if segment had no previous segment, assign null - creates an invalid path!\n\n                previousSegment = segment\n                segment = segment.nextSegment // move on to the segment after etc.\n            }\n        },\n\n        // Returns a string that can be used to reconstruct the path.\n        // Additional error checking compared to toString (must start with M segment).\n        serialize: function() {\n\n            if (!this.isValid()) throw new Error('Invalid path segments.')\n\n            return this.toString()\n        },\n\n        toString: function() {\n\n            const {segments} = this\n            const numSegments = segments.length\n\n            let pathData = ''\n            for (let i = 0; i < numSegments; i++) {\n\n                const segment = segments[i]\n                pathData += `${segment.serialize()  } `\n            }\n\n            return pathData.trim()\n        }\n    }\n\n    Object.defineProperty(Path.prototype, 'start', {\n        // Getter for the first visible endpoint of the path.\n\n        configurable: true,\n\n        enumerable: true,\n\n        get: function() {\n\n            const {segments} = this\n            const numSegments = segments.length\n            if (numSegments === 0) return null\n\n            for (let i = 0; i < numSegments; i++) {\n\n                const segment = segments[i]\n                if (segment.isVisible) return segment.start\n            }\n\n            // if no visible segment, return last segment end point\n            return segments[numSegments - 1].end\n        }\n    })\n\n    Object.defineProperty(Path.prototype, 'end', {\n        // Getter for the last visible endpoint of the path.\n\n        configurable: true,\n\n        enumerable: true,\n\n        get: function() {\n\n            const {segments} = this\n            const numSegments = segments.length\n            if (numSegments === 0) return null\n\n            for (let i = numSegments - 1; i >= 0; i--) {\n\n                const segment = segments[i]\n                if (segment.isVisible) return segment.end\n            }\n\n            // if no visible segment, return last segment end point\n            return segments[numSegments - 1].end\n        }\n    })\n\n    /*\n        Point is the most basic object consisting of x/y coordinate.\n\n        Possible instantiations are:\n        * `Point(10, 20)`\n        * `new Point(10, 20)`\n        * `Point('10 20')`\n        * `Point(Point(10, 20))`\n    */\n    var Point = g.Point = function(x, y) {\n\n        if (!(this instanceof Point)) {\n            return new Point(x, y)\n        }\n\n        if (typeof x === 'string') {\n            const xy = x.split(x.indexOf('@') === -1 ? ' ' : '@')\n            x = parseFloat(xy[0])\n            y = parseFloat(xy[1])\n\n        } else if (Object(x) === x) {\n            y = x.y\n            x = x.x\n        }\n\n        this.x = x === undefined ? 0 : x\n        this.y = y === undefined ? 0 : y\n    }\n\n    // Alternative constructor, from polar coordinates.\n    // @param {number} Distance.\n    // @param {number} Angle in radians.\n    // @param {point} [optional] Origin.\n    Point.fromPolar = function(distance, angle, origin) {\n\n        origin = (origin && new Point(origin)) || new Point(0, 0)\n        let x = abs(distance * cos(angle))\n        let y = abs(distance * sin(angle))\n        const deg = normalizeAngle(toDeg(angle))\n\n        if (deg < 90) {\n            y = -y\n\n        } else if (deg < 180) {\n            x = -x\n            y = -y\n\n        } else if (deg < 270) {\n            x = -x\n        }\n\n        return new Point(origin.x + x, origin.y + y)\n    }\n\n    // Create a point with random coordinates that fall into the range `[x1, x2]` and `[y1, y2]`.\n    Point.random = function(x1, x2, y1, y2) {\n\n        return new Point(floor(random() * (x2 - x1 + 1) + x1), floor(random() * (y2 - y1 + 1) + y1))\n    }\n\n    Point.prototype = {\n\n        // If point lies outside rectangle `r`, return the nearest point on the boundary of rect `r`,\n        // otherwise return point itself.\n        // (see Squeak Smalltalk, Point>>adhereTo:)\n        adhereToRect: function(r) {\n\n            if (r.containsPoint(this)) {\n                return this\n            }\n\n            this.x = min(max(this.x, r.x), r.x + r.width)\n            this.y = min(max(this.y, r.y), r.y + r.height)\n            return this\n        },\n\n        // Return the bearing between me and the given point.\n        bearing: function(point) {\n\n            return (new Line(this, point)).bearing()\n        },\n\n        // Returns change in angle from my previous position (-dx, -dy) to my new position\n        // relative to ref point.\n        changeInAngle: function(dx, dy, ref) {\n\n            // Revert the translation and measure the change in angle around x-axis.\n            return this.clone().offset(-dx, -dy).theta(ref) - this.theta(ref)\n        },\n\n        clone: function() {\n\n            return new Point(this)\n        },\n\n        difference: function(dx, dy) {\n\n            if ((Object(dx) === dx)) {\n                dy = dx.y\n                dx = dx.x\n            }\n\n            return new Point(this.x - (dx || 0), this.y - (dy || 0))\n        },\n\n        // Returns distance between me and point `p`.\n        distance: function(p) {\n\n            return (new Line(this, p)).length()\n        },\n\n        squaredDistance: function(p) {\n\n            return (new Line(this, p)).squaredLength()\n        },\n\n        equals: function(p) {\n\n            return !!p &&\n                this.x === p.x &&\n                this.y === p.y\n        },\n\n        magnitude: function() {\n\n            return sqrt((this.x * this.x) + (this.y * this.y)) || 0.01\n        },\n\n        // Returns a manhattan (taxi-cab) distance between me and point `p`.\n        manhattanDistance: function(p) {\n\n            return abs(p.x - this.x) + abs(p.y - this.y)\n        },\n\n        // Move point on line starting from ref ending at me by\n        // distance distance.\n        move: function(ref, distance) {\n\n            const theta = toRad((new Point(ref)).theta(this))\n            const offset = this.offset(cos(theta) * distance, -sin(theta) * distance)\n            return offset\n        },\n\n        // Scales x and y such that the distance between the point and the origin (0,0) is equal to the given length.\n        normalize: function(length) {\n\n            const scale = (length || 1) / this.magnitude()\n            return this.scale(scale, scale)\n        },\n\n        // Offset me by the specified amount.\n        offset: function(dx, dy) {\n\n            if ((Object(dx) === dx)) {\n                dy = dx.y\n                dx = dx.x\n            }\n\n            this.x += dx || 0\n            this.y += dy || 0\n            return this\n        },\n\n        // Returns a point that is the reflection of me with\n        // the center of inversion in ref point.\n        reflection: function(ref) {\n\n            return (new Point(ref)).move(this, this.distance(ref))\n        },\n\n        // Rotate point by angle around origin.\n        // Angle is flipped because this is a left-handed coord system (y-axis points downward).\n        rotate: function(origin, angle) {\n\n            origin = origin || new g.Point(0, 0)\n\n            angle = toRad(normalizeAngle(-angle))\n            const cosAngle = cos(angle)\n            const sinAngle = sin(angle)\n\n            const x = (cosAngle * (this.x - origin.x)) - (sinAngle * (this.y - origin.y)) + origin.x\n            const y = (sinAngle * (this.x - origin.x)) + (cosAngle * (this.y - origin.y)) + origin.y\n\n            this.x = x\n            this.y = y\n            return this\n        },\n\n        round: function(precision) {\n\n            const f = pow(10, precision || 0)\n            this.x = round(this.x * f) / f\n            this.y = round(this.y * f) / f\n            return this\n        },\n\n        // Scale point with origin.\n        scale: function(sx, sy, origin) {\n\n            origin = (origin && new Point(origin)) || new Point(0, 0)\n            this.x = origin.x + sx * (this.x - origin.x)\n            this.y = origin.y + sy * (this.y - origin.y)\n            return this\n        },\n\n        snapToGrid: function(gx, gy) {\n\n            this.x = snapToGrid(this.x, gx)\n            this.y = snapToGrid(this.y, gy || gx)\n            return this\n        },\n\n        // Compute the angle between me and `p` and the x axis.\n        // (cartesian-to-polar coordinates conversion)\n        // Return theta angle in degrees.\n        theta: function(p) {\n\n            p = new Point(p)\n\n            // Invert the y-axis.\n            const y = -(p.y - this.y)\n            const x = p.x - this.x\n            let rad = atan2(y, x) // defined for all 0 corner cases\n\n            // Correction for III. and IV. quadrant.\n            if (rad < 0) {\n                rad = 2 * PI + rad\n            }\n\n            return 180 * rad / PI\n        },\n\n        // Compute the angle between vector from me to p1 and the vector from me to p2.\n        // ordering of points p1 and p2 is important!\n        // theta function's angle convention:\n        // returns angles between 0 and 180 when the angle is counterclockwise\n        // returns angles between 180 and 360 to convert clockwise angles into counterclockwise ones\n        // returns NaN if any of the points p1, p2 is coincident with this point\n        angleBetween: function(p1, p2) {\n\n            let angleBetween = (this.equals(p1) || this.equals(p2)) ? NaN : (this.theta(p2) - this.theta(p1))\n\n            if (angleBetween < 0) {\n                angleBetween += 360 // correction to keep angleBetween between 0 and 360\n            }\n\n            return angleBetween\n        },\n\n        // Compute the angle between the vector from 0,0 to me and the vector from 0,0 to p.\n        // Returns NaN if p is at 0,0.\n        vectorAngle: function(p) {\n\n            const zero = new Point(0,0)\n            return zero.angleBetween(this, p)\n        },\n\n        toJSON: function() {\n\n            return { x: this.x, y: this.y }\n        },\n\n        // Converts rectangular to polar coordinates.\n        // An origin can be specified, otherwise it's 0@0.\n        toPolar: function(o) {\n\n            o = (o && new Point(o)) || new Point(0, 0)\n            const {x} = this\n            const {y} = this\n            this.x = sqrt((x - o.x) * (x - o.x) + (y - o.y) * (y - o.y)) // r\n            this.y = toRad(o.theta(new Point(x, y)))\n            return this\n        },\n\n        toString: function() {\n\n            return `${this.x  }@${  this.y}`\n        },\n\n        update: function(x, y) {\n\n            this.x = x || 0\n            this.y = y || 0\n            return this\n        },\n\n        // Returns the dot product of this point with given other point\n        dot: function(p) {\n\n            return p ? (this.x * p.x + this.y * p.y) : NaN\n        },\n\n        // Returns the cross product of this point relative to two other points\n        // this point is the common point\n        // point p1 lies on the first vector, point p2 lies on the second vector\n        // watch out for the ordering of points p1 and p2!\n        // positive result indicates a clockwise (\"right\") turn from first to second vector\n        // negative result indicates a counterclockwise (\"left\") turn from first to second vector\n        // note that the above directions are reversed from the usual answer on the Internet\n        // that is because we are in a left-handed coord system (because the y-axis points downward)\n        cross: function(p1, p2) {\n\n            return (p1 && p2) ? (((p2.x - this.x) * (p1.y - this.y)) - ((p2.y - this.y) * (p1.x - this.x))) : NaN\n        },\n\n\n        // Linear interpolation\n        lerp: function(p, t) {\n\n            const {x} = this\n            const {y} = this\n            return new Point((1 - t) * x + t * p.x, (1 - t) * y + t * p.y)\n        }\n    }\n\n    Point.prototype.translate = Point.prototype.offset\n\n    var Rect = g.Rect = function(x, y, w, h) {\n\n        if (!(this instanceof Rect)) {\n            return new Rect(x, y, w, h)\n        }\n\n        if ((Object(x) === x)) {\n            y = x.y\n            w = x.width\n            h = x.height\n            x = x.x\n        }\n\n        this.x = x === undefined ? 0 : x\n        this.y = y === undefined ? 0 : y\n        this.width = w === undefined ? 0 : w\n        this.height = h === undefined ? 0 : h\n    }\n\n    Rect.fromEllipse = function(e) {\n\n        e = new Ellipse(e)\n        return new Rect(e.x - e.a, e.y - e.b, 2 * e.a, 2 * e.b)\n    }\n\n    Rect.prototype = {\n\n        // Find my bounding box when I'm rotated with the center of rotation in the center of me.\n        // @return r {rectangle} representing a bounding box\n        bbox: function(angle) {\n\n            if (!angle) return this.clone()\n\n            const theta = toRad(angle || 0)\n            const st = abs(sin(theta))\n            const ct = abs(cos(theta))\n            const w = this.width * ct + this.height * st\n            const h = this.width * st + this.height * ct\n            return new Rect(this.x + (this.width - w) / 2, this.y + (this.height - h) / 2, w, h)\n        },\n\n        bottomLeft: function() {\n\n            return new Point(this.x, this.y + this.height)\n        },\n\n        bottomLine: function() {\n\n            return new Line(this.bottomLeft(), this.bottomRight())\n        },\n\n        bottomMiddle: function() {\n\n            return new Point(this.x + this.width / 2, this.y + this.height)\n        },\n\n        center: function() {\n\n            return new Point(this.x + this.width / 2, this.y + this.height / 2)\n        },\n\n        clone: function() {\n\n            return new Rect(this)\n        },\n\n        // @return {bool} true if point p is insight me\n        containsPoint: function(p) {\n\n            p = new Point(p)\n            return p.x >= this.x && p.x <= this.x + this.width && p.y >= this.y && p.y <= this.y + this.height\n        },\n\n        // @return {bool} true if rectangle `r` is inside me.\n        containsRect: function(r) {\n\n            const r0 = new Rect(this).normalize()\n            const r1 = new Rect(r).normalize()\n            let w0 = r0.width\n            let h0 = r0.height\n            let w1 = r1.width\n            let h1 = r1.height\n\n            if (!w0 || !h0 || !w1 || !h1) {\n                // At least one of the dimensions is 0\n                return false\n            }\n\n            const x0 = r0.x\n            const y0 = r0.y\n            const x1 = r1.x\n            const y1 = r1.y\n\n            w1 += x1\n            w0 += x0\n            h1 += y1\n            h0 += y0\n\n            return x0 <= x1 && w1 <= w0 && y0 <= y1 && h1 <= h0\n        },\n\n        corner: function() {\n\n            return new Point(this.x + this.width, this.y + this.height)\n        },\n\n        // @return {boolean} true if rectangles are equal.\n        equals: function(r) {\n\n            const mr = (new Rect(this)).normalize()\n            const nr = (new Rect(r)).normalize()\n            return mr.x === nr.x && mr.y === nr.y && mr.width === nr.width && mr.height === nr.height\n        },\n\n        // @return {rect} if rectangles intersect, {null} if not.\n        intersect: function(r) {\n\n            const myOrigin = this.origin()\n            const myCorner = this.corner()\n            const rOrigin = r.origin()\n            const rCorner = r.corner()\n\n            // No intersection found\n            if (rCorner.x <= myOrigin.x ||\n                rCorner.y <= myOrigin.y ||\n                rOrigin.x >= myCorner.x ||\n                rOrigin.y >= myCorner.y) return null\n\n            const x = max(myOrigin.x, rOrigin.x)\n            const y = max(myOrigin.y, rOrigin.y)\n\n            return new Rect(x, y, min(myCorner.x, rCorner.x) - x, min(myCorner.y, rCorner.y) - y)\n        },\n\n        intersectionWithLine: function(line) {\n\n            const r = this\n            const rectLines = [ r.topLine(), r.rightLine(), r.bottomLine(), r.leftLine() ]\n            const points = []\n            const dedupeArr = []\n            let pt; let i\n\n            const n = rectLines.length\n            for (i = 0; i < n; i ++) {\n\n                pt = line.intersect(rectLines[i])\n                if (pt !== null && dedupeArr.indexOf(pt.toString()) < 0) {\n                    points.push(pt)\n                    dedupeArr.push(pt.toString())\n                }\n            }\n\n            return points.length > 0 ? points : null\n        },\n\n        // Find point on my boundary where line starting\n        // from my center ending in point p intersects me.\n        // @param {number} angle If angle is specified, intersection with rotated rectangle is computed.\n        intersectionWithLineFromCenterToPoint: function(p, angle) {\n\n            p = new Point(p)\n            const center = new Point(this.x + this.width / 2, this.y + this.height / 2)\n            let result\n\n            if (angle) p.rotate(center, angle)\n\n            // (clockwise, starting from the top side)\n            const sides = [\n                this.topLine(),\n                this.rightLine(),\n                this.bottomLine(),\n                this.leftLine()\n            ]\n            const connector = new Line(center, p)\n\n            for (let i = sides.length - 1; i >= 0; --i) {\n                const intersection = sides[i].intersection(connector)\n                if (intersection !== null) {\n                    result = intersection\n                    break\n                }\n            }\n            if (result && angle) result.rotate(center, -angle)\n            return result\n        },\n\n        leftLine: function() {\n\n            return new Line(this.topLeft(), this.bottomLeft())\n        },\n\n        leftMiddle: function() {\n\n            return new Point(this.x , this.y + this.height / 2)\n        },\n\n        // Move and expand me.\n        // @param r {rectangle} representing deltas\n        moveAndExpand: function(r) {\n\n            this.x += r.x || 0\n            this.y += r.y || 0\n            this.width += r.width || 0\n            this.height += r.height || 0\n            return this\n        },\n\n        // Offset me by the specified amount.\n        offset: function(dx, dy) {\n\n            // pretend that this is a point and call offset()\n            // rewrites x and y according to dx and dy\n            return Point.prototype.offset.call(this, dx, dy)\n        },\n\n        // inflate by dx and dy, recompute origin [x, y]\n        // @param dx {delta_x} representing additional size to x\n        // @param dy {delta_y} representing additional size to y -\n        // dy param is not required -> in that case y is sized by dx\n        inflate: function(dx, dy) {\n\n            if (dx === undefined) {\n                dx = 0\n            }\n\n            if (dy === undefined) {\n                dy = dx\n            }\n\n            this.x -= dx\n            this.y -= dy\n            this.width += 2 * dx\n            this.height += 2 * dy\n\n            return this\n        },\n\n        // Normalize the rectangle; i.e., make it so that it has a non-negative width and height.\n        // If width < 0 the function swaps the left and right corners,\n        // and it swaps the top and bottom corners if height < 0\n        // like in http://qt-project.org/doc/qt-4.8/qrectf.html#normalized\n        normalize: function() {\n\n            let newx = this.x\n            let newy = this.y\n            let newwidth = this.width\n            let newheight = this.height\n            if (this.width < 0) {\n                newx = this.x + this.width\n                newwidth = -this.width\n            }\n            if (this.height < 0) {\n                newy = this.y + this.height\n                newheight = -this.height\n            }\n            this.x = newx\n            this.y = newy\n            this.width = newwidth\n            this.height = newheight\n            return this\n        },\n\n        origin: function() {\n\n            return new Point(this.x, this.y)\n        },\n\n        // @return {point} a point on my boundary nearest to the given point.\n        // @see Squeak Smalltalk, Rectangle>>pointNearestTo:\n        pointNearestToPoint: function(point) {\n\n            point = new Point(point)\n            if (this.containsPoint(point)) {\n                const side = this.sideNearestToPoint(point)\n                switch (side){\n                    case 'right': return new Point(this.x + this.width, point.y)\n                    case 'left': return new Point(this.x, point.y)\n                    case 'bottom': return new Point(point.x, this.y + this.height)\n                    case 'top': return new Point(point.x, this.y)\n                }\n            }\n            return point.adhereToRect(this)\n        },\n\n        rightLine: function() {\n\n            return new Line(this.topRight(), this.bottomRight())\n        },\n\n        rightMiddle: function() {\n\n            return new Point(this.x + this.width, this.y + this.height / 2)\n        },\n\n        round: function(precision) {\n\n            const f = pow(10, precision || 0)\n            this.x = round(this.x * f) / f\n            this.y = round(this.y * f) / f\n            this.width = round(this.width * f) / f\n            this.height = round(this.height * f) / f\n            return this\n        },\n\n        // Scale rectangle with origin.\n        scale: function(sx, sy, origin) {\n\n            origin = this.origin().scale(sx, sy, origin)\n            this.x = origin.x\n            this.y = origin.y\n            this.width *= sx\n            this.height *= sy\n            return this\n        },\n\n        maxRectScaleToFit: function(rect, origin) {\n\n            rect = new Rect(rect)\n            origin || (origin = rect.center())\n\n            let sx1; let sx2; let sx3; let sx4; let sy1; let sy2; let sy3; let sy4\n            const ox = origin.x\n            const oy = origin.y\n\n            // Here we find the maximal possible scale for all corner points (for x and y axis) of the rectangle,\n            // so when the scale is applied the point is still inside the rectangle.\n\n            sx1 = sx2 = sx3 = sx4 = sy1 = sy2 = sy3 = sy4 = Infinity\n\n            // Top Left\n            const p1 = rect.topLeft()\n            if (p1.x < ox) {\n                sx1 = (this.x - ox) / (p1.x - ox)\n            }\n            if (p1.y < oy) {\n                sy1 = (this.y - oy) / (p1.y - oy)\n            }\n            // Bottom Right\n            const p2 = rect.bottomRight()\n            if (p2.x > ox) {\n                sx2 = (this.x + this.width - ox) / (p2.x - ox)\n            }\n            if (p2.y > oy) {\n                sy2 = (this.y + this.height - oy) / (p2.y - oy)\n            }\n            // Top Right\n            const p3 = rect.topRight()\n            if (p3.x > ox) {\n                sx3 = (this.x + this.width - ox) / (p3.x - ox)\n            }\n            if (p3.y < oy) {\n                sy3 = (this.y - oy) / (p3.y - oy)\n            }\n            // Bottom Left\n            const p4 = rect.bottomLeft()\n            if (p4.x < ox) {\n                sx4 = (this.x - ox) / (p4.x - ox)\n            }\n            if (p4.y > oy) {\n                sy4 = (this.y + this.height - oy) / (p4.y - oy)\n            }\n\n            return {\n                sx: min(sx1, sx2, sx3, sx4),\n                sy: min(sy1, sy2, sy3, sy4)\n            }\n        },\n\n        maxRectUniformScaleToFit: function(rect, origin) {\n\n            const scale = this.maxRectScaleToFit(rect, origin)\n            return min(scale.sx, scale.sy)\n        },\n\n        // @return {string} (left|right|top|bottom) side which is nearest to point\n        // @see Squeak Smalltalk, Rectangle>>sideNearestTo:\n        sideNearestToPoint: function(point) {\n\n            point = new Point(point)\n            const distToLeft = point.x - this.x\n            const distToRight = (this.x + this.width) - point.x\n            const distToTop = point.y - this.y\n            const distToBottom = (this.y + this.height) - point.y\n            let closest = distToLeft\n            let side = 'left'\n\n            if (distToRight < closest) {\n                closest = distToRight\n                side = 'right'\n            }\n            if (distToTop < closest) {\n                closest = distToTop\n                side = 'top'\n            }\n            if (distToBottom < closest) {\n                closest = distToBottom\n                side = 'bottom'\n            }\n            return side\n        },\n\n        snapToGrid: function(gx, gy) {\n\n            const origin = this.origin().snapToGrid(gx, gy)\n            const corner = this.corner().snapToGrid(gx, gy)\n            this.x = origin.x\n            this.y = origin.y\n            this.width = corner.x - origin.x\n            this.height = corner.y - origin.y\n            return this\n        },\n\n        topLine: function() {\n\n            return new Line(this.topLeft(), this.topRight())\n        },\n\n        topMiddle: function() {\n\n            return new Point(this.x + this.width / 2, this.y)\n        },\n\n        topRight: function() {\n\n            return new Point(this.x + this.width, this.y)\n        },\n\n        toJSON: function() {\n\n            return { x: this.x, y: this.y, width: this.width, height: this.height }\n        },\n\n        toString: function() {\n\n            return `${this.origin().toString()  } ${  this.corner().toString()}`\n        },\n\n        // @return {rect} representing the union of both rectangles.\n        union: function(rect) {\n\n            rect = new Rect(rect)\n            const myOrigin = this.origin()\n            const myCorner = this.corner()\n            const rOrigin = rect.origin()\n            const rCorner = rect.corner()\n\n            const originX = min(myOrigin.x, rOrigin.x)\n            const originY = min(myOrigin.y, rOrigin.y)\n            const cornerX = max(myCorner.x, rCorner.x)\n            const cornerY = max(myCorner.y, rCorner.y)\n\n            return new Rect(originX, originY, cornerX - originX, cornerY - originY)\n        }\n    }\n\n    Rect.prototype.bottomRight = Rect.prototype.corner\n\n    Rect.prototype.topLeft = Rect.prototype.origin\n\n    Rect.prototype.translate = Rect.prototype.offset\n\n    var Polyline = g.Polyline = function(points) {\n\n        if (!(this instanceof Polyline)) {\n            return new Polyline(points)\n        }\n\n        if (typeof points === 'string') {\n            return new Polyline.parse(points)\n        }\n\n        this.points = (Array.isArray(points) ? points.map(Point) : [])\n    }\n\n    Polyline.parse = function(svgString) {\n        svgString = svgString.trim()\n        if (svgString === '') return new Polyline()\n\n        const points = []\n\n        const coords = svgString.split(/\\s*,\\s*|\\s+/)\n        const n = coords.length\n        for (let i = 0; i < n; i += 2) {\n            points.push({ x: +coords[i], y: +coords[i + 1] })\n        }\n\n        return new Polyline(points)\n    }\n\n    Polyline.prototype = {\n\n        bbox: function() {\n\n            let x1 = Infinity\n            let x2 = -Infinity\n            let y1 = Infinity\n            let y2 = -Infinity\n\n            const {points} = this\n            const numPoints = points.length\n            if (numPoints === 0) return null // if points array is empty\n\n            for (let i = 0; i < numPoints; i++) {\n\n                const point = points[i]\n                const {x} = point\n                const {y} = point\n\n                if (x < x1) x1 = x\n                if (x > x2) x2 = x\n                if (y < y1) y1 = y\n                if (y > y2) y2 = y\n            }\n\n            return new Rect(x1, y1, x2 - x1, y2 - y1)\n        },\n\n        clone: function() {\n\n            const {points} = this\n            const numPoints = points.length\n            if (numPoints === 0) return new Polyline() // if points array is empty\n\n            const newPoints = []\n            for (let i = 0; i < numPoints; i++) {\n\n                const point = points[i].clone()\n                newPoints.push(point)\n            }\n\n            return new Polyline(newPoints)\n        },\n\n        closestPoint: function(p) {\n\n            const cpLength = this.closestPointLength(p)\n\n            return this.pointAtLength(cpLength)\n        },\n\n        closestPointLength: function(p) {\n\n            const {points} = this\n            const numPoints = points.length\n            if (numPoints === 0) return 0 // if points array is empty\n            if (numPoints === 1) return 0 // if there is only one point\n\n            let cpLength\n            let minSqrDistance = Infinity\n            let length = 0\n            const n = numPoints - 1\n            for (let i = 0; i < n; i++) {\n\n                const line = new Line(points[i], points[i + 1])\n                const lineLength = line.length()\n\n                const cpNormalizedLength = line.closestPointNormalizedLength(p)\n                const cp = line.pointAt(cpNormalizedLength)\n\n                const sqrDistance = cp.squaredDistance(p)\n                if (sqrDistance < minSqrDistance) {\n                    minSqrDistance = sqrDistance\n                    cpLength = length + (cpNormalizedLength * lineLength)\n                }\n\n                length += lineLength\n            }\n\n            return cpLength\n        },\n\n        closestPointNormalizedLength: function(p) {\n\n            const cpLength = this.closestPointLength(p)\n            if (cpLength === 0) return 0 // shortcut\n\n            const length = this.length()\n            if (length === 0) return 0 // prevents division by zero\n\n            return cpLength / length\n        },\n\n        closestPointTangent: function(p) {\n\n            const cpLength = this.closestPointLength(p)\n\n            return this.tangentAtLength(cpLength)\n        },\n\n        // Returns a convex-hull polyline from this polyline.\n        // Implements the Graham scan (https://en.wikipedia.org/wiki/Graham_scan).\n        // Output polyline starts at the first element of the original polyline that is on the hull, then continues clockwise.\n        // Minimal polyline is found (only vertices of the hull are reported, no collinear points).\n        convexHull: function() {\n\n            let i\n            let n\n\n            const {points} = this\n            const numPoints = points.length\n            if (numPoints === 0) return new Polyline() // if points array is empty\n\n            // step 1: find the starting point - point with the lowest y (if equality, highest x)\n            let startPoint\n            for (i = 0; i < numPoints; i++) {\n                if (startPoint === undefined) {\n                    // if this is the first point we see, set it as start point\n                    startPoint = points[i]\n\n                } else if (points[i].y < startPoint.y) {\n                    // start point should have lowest y from all points\n                    startPoint = points[i]\n\n                } else if ((points[i].y === startPoint.y) && (points[i].x > startPoint.x)) {\n                    // if two points have the lowest y, choose the one that has highest x\n                    // there are no points to the right of startPoint - no ambiguity about theta 0\n                    // if there are several coincident start point candidates, first one is reported\n                    startPoint = points[i]\n                }\n            }\n\n            // step 2: sort the list of points\n            // sorting by angle between line from startPoint to point and the x-axis (theta)\n\n            // step 2a: create the point records = [point, originalIndex, angle]\n            const sortedPointRecords = []\n            for (i = 0; i < numPoints; i++) {\n\n                let angle = startPoint.theta(points[i])\n                if (angle === 0) {\n                    angle = 360 // give highest angle to start point\n                    // the start point will end up at end of sorted list\n                    // the start point will end up at beginning of hull points list\n                }\n\n                const entry = [points[i], i, angle]\n                sortedPointRecords.push(entry)\n            }\n\n            // step 2b: sort the list in place\n            sortedPointRecords.sort(function(record1, record2) {\n                // returning a negative number here sorts record1 before record2\n                // if first angle is smaller than second, first angle should come before second\n\n                let sortOutput = record1[2] - record2[2]  // negative if first angle smaller\n                if (sortOutput === 0) {\n                    // if the two angles are equal, sort by originalIndex\n                    sortOutput = record2[1] - record1[1] // negative if first index larger\n                    // coincident points will be sorted in reverse-numerical order\n                    // so the coincident points with lower original index will be considered first\n                }\n\n                return sortOutput\n            })\n\n            // step 2c: duplicate start record from the top of the stack to the bottom of the stack\n            if (sortedPointRecords.length > 2) {\n                const startPointRecord = sortedPointRecords[sortedPointRecords.length-1]\n                sortedPointRecords.unshift(startPointRecord)\n            }\n\n            // step 3a: go through sorted points in order and find those with right turns\n            // we want to get our results in clockwise order\n            const insidePoints = {} // dictionary of points with left turns - cannot be on the hull\n            const hullPointRecords = [] // stack of records with right turns - hull point candidates\n\n            let currentPointRecord\n            let currentPoint\n            let lastHullPointRecord\n            let lastHullPoint\n            let secondLastHullPointRecord\n            let secondLastHullPoint\n            while (sortedPointRecords.length !== 0) {\n\n                currentPointRecord = sortedPointRecords.pop()\n                currentPoint = currentPointRecord[0]\n\n                // check if point has already been discarded\n                // keys for insidePoints are stored in the form 'point.x@point.y@@originalIndex'\n                if (insidePoints.hasOwnProperty(`${currentPointRecord[0]  }@@${  currentPointRecord[1]}`)) {\n                    // this point had an incorrect turn at some previous iteration of this loop\n                    // this disqualifies it from possibly being on the hull\n                    continue\n                }\n\n                let correctTurnFound = false\n                while (!correctTurnFound) {\n\n                    if (hullPointRecords.length < 2) {\n                        // not enough points for comparison, just add current point\n                        hullPointRecords.push(currentPointRecord)\n                        correctTurnFound = true\n\n                    } else {\n                        lastHullPointRecord = hullPointRecords.pop()\n                        lastHullPoint = lastHullPointRecord[0]\n                        secondLastHullPointRecord = hullPointRecords.pop()\n                        secondLastHullPoint = secondLastHullPointRecord[0]\n\n                        const crossProduct = secondLastHullPoint.cross(lastHullPoint, currentPoint)\n\n                        if (crossProduct < 0) {\n                            // found a right turn\n                            hullPointRecords.push(secondLastHullPointRecord)\n                            hullPointRecords.push(lastHullPointRecord)\n                            hullPointRecords.push(currentPointRecord)\n                            correctTurnFound = true\n\n                        } else if (crossProduct === 0) {\n                            // the three points are collinear\n                            // three options:\n                            // there may be a 180 or 0 degree angle at lastHullPoint\n                            // or two of the three points are coincident\n                            const THRESHOLD = 1e-10 // we have to take rounding errors into account\n                            const angleBetween = lastHullPoint.angleBetween(secondLastHullPoint, currentPoint)\n                            if (abs(angleBetween - 180) < THRESHOLD) { // rouding around 180 to 180\n                                // if the cross product is 0 because the angle is 180 degrees\n                                // discard last hull point (add to insidePoints)\n                                //insidePoints.unshift(lastHullPoint);\n                                insidePoints[`${lastHullPointRecord[0]  }@@${  lastHullPointRecord[1]}`] = lastHullPoint\n                                // reenter second-to-last hull point (will be last at next iter)\n                                hullPointRecords.push(secondLastHullPointRecord)\n                                // do not do anything with current point\n                                // correct turn not found\n\n                            } else if (lastHullPoint.equals(currentPoint) || secondLastHullPoint.equals(lastHullPoint)) {\n                                // if the cross product is 0 because two points are the same\n                                // discard last hull point (add to insidePoints)\n                                //insidePoints.unshift(lastHullPoint);\n                                insidePoints[`${lastHullPointRecord[0]  }@@${  lastHullPointRecord[1]}`] = lastHullPoint\n                                // reenter second-to-last hull point (will be last at next iter)\n                                hullPointRecords.push(secondLastHullPointRecord)\n                                // do not do anything with current point\n                                // correct turn not found\n\n                            } else if (abs(((angleBetween + 1) % 360) - 1) < THRESHOLD) { // rounding around 0 and 360 to 0\n                                // if the cross product is 0 because the angle is 0 degrees\n                                // remove last hull point from hull BUT do not discard it\n                                // reenter second-to-last hull point (will be last at next iter)\n                                hullPointRecords.push(secondLastHullPointRecord)\n                                // put last hull point back into the sorted point records list\n                                sortedPointRecords.push(lastHullPointRecord)\n                                // we are switching the order of the 0deg and 180deg points\n                                // correct turn not found\n                            }\n\n                        } else {\n                            // found a left turn\n                            // discard last hull point (add to insidePoints)\n                            //insidePoints.unshift(lastHullPoint);\n                            insidePoints[`${lastHullPointRecord[0]  }@@${  lastHullPointRecord[1]}`] = lastHullPoint\n                            // reenter second-to-last hull point (will be last at next iter of loop)\n                            hullPointRecords.push(secondLastHullPointRecord)\n                            // do not do anything with current point\n                            // correct turn not found\n                        }\n                    }\n                }\n            }\n            // at this point, hullPointRecords contains the output points in clockwise order\n            // the points start with lowest-y,highest-x startPoint, and end at the same point\n\n            // step 3b: remove duplicated startPointRecord from the end of the array\n            if (hullPointRecords.length > 2) {\n                hullPointRecords.pop()\n            }\n\n            // step 4: find the lowest originalIndex record and put it at the beginning of hull\n            let lowestHullIndex // the lowest originalIndex on the hull\n            let indexOfLowestHullIndexRecord = -1 // the index of the record with lowestHullIndex\n            n = hullPointRecords.length\n            for (i = 0; i < n; i++) {\n\n                const currentHullIndex = hullPointRecords[i][1]\n\n                if (lowestHullIndex === undefined || currentHullIndex < lowestHullIndex) {\n                    lowestHullIndex = currentHullIndex\n                    indexOfLowestHullIndexRecord = i\n                }\n            }\n\n            let hullPointRecordsReordered = []\n            if (indexOfLowestHullIndexRecord > 0) {\n                const newFirstChunk = hullPointRecords.slice(indexOfLowestHullIndexRecord)\n                const newSecondChunk = hullPointRecords.slice(0, indexOfLowestHullIndexRecord)\n                hullPointRecordsReordered = newFirstChunk.concat(newSecondChunk)\n\n            } else {\n                hullPointRecordsReordered = hullPointRecords\n            }\n\n            const hullPoints = []\n            n = hullPointRecordsReordered.length\n            for (i = 0; i < n; i++) {\n                hullPoints.push(hullPointRecordsReordered[i][0])\n            }\n\n            return new Polyline(hullPoints)\n        },\n\n        // Checks whether two polylines are exactly the same.\n        // If `p` is undefined or null, returns false.\n        equals: function(p) {\n\n            if (!p) return false\n\n            const {points} = this\n            const otherPoints = p.points\n\n            const numPoints = points.length\n            if (otherPoints.length !== numPoints) return false // if the two polylines have different number of points, they cannot be equal\n\n            for (let i = 0; i < numPoints; i++) {\n\n                const point = points[i]\n                const otherPoint = p.points[i]\n\n                // as soon as an inequality is found in points, return false\n                if (!point.equals(otherPoint)) return false\n            }\n\n            // if no inequality found in points, return true\n            return true\n        },\n\n        isDifferentiable: function() {\n\n            const {points} = this\n            const numPoints = points.length\n            if (numPoints === 0) return false\n\n            const n = numPoints - 1\n            for (let i = 0; i < n; i++) {\n\n                const a = points[i]\n                const b = points[i + 1]\n                const line = new Line(a, b)\n\n                // as soon as a differentiable line is found between two points, return true\n                if (line.isDifferentiable()) return true\n            }\n\n            // if no differentiable line is found between pairs of points, return false\n            return false\n        },\n\n        length: function() {\n\n            const {points} = this\n            const numPoints = points.length\n            if (numPoints === 0) return 0 // if points array is empty\n\n            let length = 0\n            const n = numPoints - 1\n            for (let i = 0; i < n; i++) {\n                length += points[i].distance(points[i + 1])\n            }\n\n            return length\n        },\n\n        pointAt: function(ratio) {\n\n            const {points} = this\n            const numPoints = points.length\n            if (numPoints === 0) return null // if points array is empty\n            if (numPoints === 1) return points[0].clone() // if there is only one point\n\n            if (ratio <= 0) return points[0].clone()\n            if (ratio >= 1) return points[numPoints - 1].clone()\n\n            const polylineLength = this.length()\n            const length = polylineLength * ratio\n\n            return this.pointAtLength(length)\n        },\n\n        pointAtLength: function(length) {\n\n            const {points} = this\n            const numPoints = points.length\n            if (numPoints === 0) return null // if points array is empty\n            if (numPoints === 1) return points[0].clone() // if there is only one point\n\n            let fromStart = true\n            if (length < 0) {\n                fromStart = false // negative lengths mean start calculation from end point\n                length = -length // absolute value\n            }\n\n            let l = 0\n            const n = numPoints - 1\n            for (let i = (fromStart ? 0 : (n - 1)); (fromStart ? (i < n) : (i >= 0)); (fromStart ? (i++) : (i--))) {\n\n                const a = points[i]\n                const b = points[i + 1]\n                const line = new Line(a, b)\n                const d = a.distance(b)\n\n                if (length <= (l + d)) {\n                    return line.pointAtLength((fromStart ? 1 : -1) * (length - l))\n                }\n\n                l += d\n            }\n\n            // if length requested is higher than the length of the polyline, return last endpoint\n            const lastPoint = (fromStart ? points[numPoints - 1] : points[0])\n            return lastPoint.clone()\n        },\n\n        scale: function(sx, sy, origin) {\n\n            const {points} = this\n            const numPoints = points.length\n            if (numPoints === 0) return this // if points array is empty\n\n            for (let i = 0; i < numPoints; i++) {\n                points[i].scale(sx, sy, origin)\n            }\n\n            return this\n        },\n\n        tangentAt: function(ratio) {\n\n            const {points} = this\n            const numPoints = points.length\n            if (numPoints === 0) return null // if points array is empty\n            if (numPoints === 1) return null // if there is only one point\n\n            if (ratio < 0) ratio = 0\n            if (ratio > 1) ratio = 1\n\n            const polylineLength = this.length()\n            const length = polylineLength * ratio\n\n            return this.tangentAtLength(length)\n        },\n\n        tangentAtLength: function(length) {\n\n            const {points} = this\n            const numPoints = points.length\n            if (numPoints === 0) return null // if points array is empty\n            if (numPoints === 1) return null // if there is only one point\n\n            let fromStart = true\n            if (length < 0) {\n                fromStart = false // negative lengths mean start calculation from end point\n                length = -length // absolute value\n            }\n\n            let lastValidLine // differentiable (with a tangent)\n            let l = 0 // length so far\n            const n = numPoints - 1\n            for (let i = (fromStart ? (0) : (n - 1)); (fromStart ? (i < n) : (i >= 0)); (fromStart ? (i++) : (i--))) {\n\n                const a = points[i]\n                const b = points[i + 1]\n                const line = new Line(a, b)\n                const d = a.distance(b)\n\n                if (line.isDifferentiable()) { // has a tangent line (line length is not 0)\n                    if (length <= (l + d)) {\n                        return line.tangentAtLength((fromStart ? 1 : -1) * (length - l))\n                    }\n\n                    lastValidLine = line\n                }\n\n                l += d\n            }\n\n            // if length requested is higher than the length of the polyline, return last valid endpoint\n            if (lastValidLine) {\n                const ratio = (fromStart ? 1 : 0)\n                return lastValidLine.tangentAt(ratio)\n            }\n\n            // if no valid line, return null\n            return null\n        },\n\n        intersectionWithLine: function(l) {\n            const line = new Line(l)\n            const intersections = []\n            const {points} = this\n            for (let i = 0, n = points.length - 1; i < n; i++) {\n                const a = points[i]\n                const b = points[i+1]\n                const l2 = new Line(a, b)\n                const int = line.intersectionWithLine(l2)\n                if (int) intersections.push(int[0])\n            }\n            return (intersections.length > 0) ? intersections : null\n        },\n\n        translate: function(tx, ty) {\n\n            const {points} = this\n            const numPoints = points.length\n            if (numPoints === 0) return this // if points array is empty\n\n            for (let i = 0; i < numPoints; i++) {\n                points[i].translate(tx, ty)\n            }\n\n            return this\n        },\n\n        // Return svgString that can be used to recreate this line.\n        serialize: function() {\n\n            const {points} = this\n            const numPoints = points.length\n            if (numPoints === 0) return '' // if points array is empty\n\n            let output = ''\n            for (let i = 0; i < numPoints; i++) {\n\n                const point = points[i]\n                output += `${point.x  },${  point.y  } `\n            }\n\n            return output.trim()\n        },\n\n        toString: function() {\n\n            return `${this.points  }`\n        }\n    }\n\n    Object.defineProperty(Polyline.prototype, 'start', {\n        // Getter for the first point of the polyline.\n\n        configurable: true,\n\n        enumerable: true,\n\n        get: function() {\n\n            const {points} = this\n            const numPoints = points.length\n            if (numPoints === 0) return null // if points array is empty\n\n            return this.points[0]\n        },\n    })\n\n    Object.defineProperty(Polyline.prototype, 'end', {\n        // Getter for the last point of the polyline.\n\n        configurable: true,\n\n        enumerable: true,\n\n        get: function() {\n\n            const {points} = this\n            const numPoints = points.length\n            if (numPoints === 0) return null // if points array is empty\n\n            return this.points[numPoints - 1]\n        },\n    })\n\n    g.scale = {\n\n        // Return the `value` from the `domain` interval scaled to the `range` interval.\n        linear: function(domain, range, value) {\n\n            const domainSpan = domain[1] - domain[0]\n            const rangeSpan = range[1] - range[0]\n            return (((value - domain[0]) / domainSpan) * rangeSpan + range[0]) || 0\n        }\n    }\n\n    var normalizeAngle = g.normalizeAngle = function(angle) {\n\n        return (angle % 360) + (angle < 0 ? 360 : 0)\n    }\n\n    var snapToGrid = g.snapToGrid = function(value, gridSize) {\n\n        return gridSize * round(value / gridSize)\n    }\n\n    var toDeg = g.toDeg = function(rad) {\n\n        return (180 * rad / PI) % 360\n    }\n\n    var toRad = g.toRad = function(deg, over360) {\n\n        over360 = over360 || false\n        deg = over360 ? deg : (deg % 360)\n        return deg * PI / 180\n    }\n\n    // For backwards compatibility:\n    g.ellipse = g.Ellipse\n    g.line = g.Line\n    g.point = g.Point\n    g.rect = g.Rect\n\n    // Local helper function.\n    // Use an array of arguments to call a constructor (function called with `new`).\n    // Adapted from https://stackoverflow.com/a/8843181/2263595\n    // It is not necessary to use this function if the arguments can be passed separately (i.e. if the number of arguments is limited).\n    // - If that is the case, use `new constructor(arg1, arg2)`, for example.\n    // It is not necessary to use this function if the function that needs an array of arguments is not supposed to be used as a constructor.\n    // - If that is the case, use `f.apply(thisArg, [arg1, arg2...])`, for example.\n    function applyToNew(constructor, argsArray) {\n        // The `new` keyword can only be applied to functions that take a limited number of arguments.\n        // - We can fake that with .bind().\n        // - It calls a function (`constructor`, here) with the arguments that were provided to it - effectively transforming an unlimited number of arguments into limited.\n        // - So `new (constructor.bind(thisArg, arg1, arg2...))`\n        // - `thisArg` can be anything (e.g. null) because `new` keyword resets context to the constructor object.\n        // We need to pass in a variable number of arguments to the bind() call.\n        // - We can use .apply().\n        // - So `new (constructor.bind.apply(constructor, [thisArg, arg1, arg2...]))`\n        // - `thisArg` can still be anything because `new` overwrites it.\n        // Finally, to make sure that constructor.bind overwriting is not a problem, we switch to `Function.prototype.bind`.\n        // - So, the final version is `new (Function.prototype.bind.apply(constructor, [thisArg, arg1, arg2...]))`\n\n        // The function expects `argsArray[0]` to be `thisArg`.\n        // - This means that whatever is sent as the first element will be ignored.\n        // - The constructor will only see arguments starting from argsArray[1].\n        // - So, a new dummy element is inserted at the start of the array.\n        argsArray.unshift(null)\n\n        return new (Function.prototype.bind.apply(constructor, argsArray))\n    }\n\n    // Local helper function.\n    // Add properties from arguments on top of properties from `obj`.\n    // This allows for rudimentary inheritance.\n    // - The `obj` argument acts as parent.\n    // - This function creates a new object that inherits all `obj` properties and adds/replaces those that are present in arguments.\n    // - A high-level example: calling `extend(Vehicle, Car)` would be akin to declaring `class Car extends Vehicle`.\n    function extend(obj) {\n        // In JavaScript, the combination of a constructor function (e.g. `g.Line = function(...) {...}`) and prototype (e.g. `g.Line.prototype = {...}) is akin to a C++ class.\n        // - When inheritance is not necessary, we can leave it at that. (This would be akin to calling extend with only `obj`.)\n        // - But, what if we wanted the `g.Line` quasiclass to inherit from another quasiclass (let's call it `g.GeometryObject`) in JavaScript?\n        // - First, realize that both of those quasiclasses would still have their own separate constructor function.\n        // - So what we are actually saying is that we want the `g.Line` prototype to inherit from `g.GeometryObject` prototype.\n        // - This method provides a way to do exactly that.\n        // - It copies parent prototype's properties, then adds extra ones from child prototype/overrides parent prototype properties with child prototype properties.\n        // - Therefore, to continue with the example above:\n        //   - `g.Line.prototype = extend(g.GeometryObject.prototype, linePrototype)`\n        //   - Where `linePrototype` is a properties object that looks just like `g.Line.prototype` does right now.\n        //   - Then, `g.Line` would allow the programmer to access to all methods currently in `g.Line.Prototype`, plus any non-overriden methods from `g.GeometryObject.prototype`.\n        //   - In that aspect, `g.GeometryObject` would then act like the parent of `g.Line`.\n        // - Multiple inheritance is also possible, if multiple arguments are provided.\n        // - What if we wanted to add another level of abstraction between `g.GeometryObject` and `g.Line` (let's call it `g.LinearObject`)?\n        //   - `g.Line.prototype = extend(g.GeometryObject.prototype, g.LinearObject.prototype, linePrototype)`\n        //   - The ancestors are applied in order of appearance.\n        //   - That means that `g.Line` would have inherited from `g.LinearObject` that would have inherited from `g.GeometryObject`.\n        //   - Any number of ancestors may be provided.\n        // - Note that neither `obj` nor any of the arguments need to actually be prototypes of any JavaScript quasiclass, that was just a simplified explanation.\n        // - We can create a new object composed from the properties of any number of other objects (since they do not have a constructor, we can think of those as interfaces).\n        //   - `extend({ a: 1, b: 2 }, { b: 10, c: 20 }, { c: 100, d: 200 })` gives `{ a: 1, b: 10, c: 100, d: 200 }`.\n        //   - Basically, with this function, we can emulate the `extends` keyword as well as the `implements` keyword.\n        // - Therefore, both of the following are valid:\n        //   - `Lineto.prototype = extend(Line.prototype, segmentPrototype, linetoPrototype)`\n        //   - `Moveto.prototype = extend(segmentPrototype, movetoPrototype)`\n\n        let i\n        let n\n\n        const args = []\n        n = arguments.length\n        for (i = 1; i < n; i++) { // skip over obj\n            args.push(arguments[i])\n        }\n\n        if (!obj) throw new Error('Missing a parent object.')\n        const child = Object.create(obj)\n\n        n = args.length\n        for (i = 0; i < n; i++) {\n\n            const src = args[i]\n\n            var inheritedProperty\n            var key\n            for (key in src) {\n\n                if (src.hasOwnProperty(key)) {\n                    delete child[key] // delete property inherited from parent\n                    inheritedProperty = Object.getOwnPropertyDescriptor(src, key) // get new definition of property from src\n                    Object.defineProperty(child, key, inheritedProperty) // re-add property with new definition (includes getter/setter methods)\n                }\n            }\n        }\n\n        return child\n    }\n\n    // Path segment interface:\n    const segmentPrototype = {\n\n        // Redirect calls to closestPointNormalizedLength() function if closestPointT() is not defined for segment.\n        closestPointT: function(p) {\n\n            if (this.closestPointNormalizedLength) return this.closestPointNormalizedLength(p)\n\n            throw new Error('Neither closestPointT() nor closestPointNormalizedLength() function is implemented.')\n        },\n\n        isSegment: true,\n\n        isSubpathStart: false, // true for Moveto segments\n\n        isVisible: true, // false for Moveto segments\n\n        nextSegment: null, // needed for subpath start segment updating\n\n        // Return a fraction of result of length() function if lengthAtT() is not defined for segment.\n        lengthAtT: function(t) {\n\n            if (t <= 0) return 0\n\n            const length = this.length()\n\n            if (t >= 1) return length\n\n            return length * t\n        },\n\n        // Redirect calls to pointAt() function if pointAtT() is not defined for segment.\n        pointAtT: function(t) {\n\n            if (this.pointAt) return this.pointAt(t)\n\n            throw new Error('Neither pointAtT() nor pointAt() function is implemented.')\n        },\n\n        previousSegment: null, // needed to get segment start property\n\n        subpathStartSegment: null, // needed to get closepath segment end property\n\n        // Redirect calls to tangentAt() function if tangentAtT() is not defined for segment.\n        tangentAtT: function(t) {\n\n            if (this.tangentAt) return this.tangentAt(t)\n\n            throw new Error('Neither tangentAtT() nor tangentAt() function is implemented.')\n        },\n\n        // VIRTUAL PROPERTIES (must be overriden by actual Segment implementations):\n\n        // type\n\n        // start // getter, always throws error for Moveto\n\n        // end // usually directly assigned, getter for Closepath\n\n        bbox: function() {\n\n            throw new Error('Declaration missing for virtual function.')\n        },\n\n        clone: function() {\n\n            throw new Error('Declaration missing for virtual function.')\n        },\n\n        closestPoint: function() {\n\n            throw new Error('Declaration missing for virtual function.')\n        },\n\n        closestPointLength: function() {\n\n            throw new Error('Declaration missing for virtual function.')\n        },\n\n        closestPointNormalizedLength: function() {\n\n            throw new Error('Declaration missing for virtual function.')\n        },\n\n        closestPointTangent: function() {\n\n            throw new Error('Declaration missing for virtual function.')\n        },\n\n        equals: function() {\n\n            throw new Error('Declaration missing for virtual function.')\n        },\n\n        getSubdivisions: function() {\n\n            throw new Error('Declaration missing for virtual function.')\n        },\n\n        isDifferentiable: function() {\n\n            throw new Error('Declaration missing for virtual function.')\n        },\n\n        length: function() {\n\n            throw new Error('Declaration missing for virtual function.')\n        },\n\n        pointAt: function() {\n\n            throw new Error('Declaration missing for virtual function.')\n        },\n\n        pointAtLength: function() {\n\n            throw new Error('Declaration missing for virtual function.')\n        },\n\n        scale: function() {\n\n            throw new Error('Declaration missing for virtual function.')\n        },\n\n        tangentAt: function() {\n\n            throw new Error('Declaration missing for virtual function.')\n        },\n\n        tangentAtLength: function() {\n\n            throw new Error('Declaration missing for virtual function.')\n        },\n\n        translate: function() {\n\n            throw new Error('Declaration missing for virtual function.')\n        },\n\n        serialize: function() {\n\n            throw new Error('Declaration missing for virtual function.')\n        },\n\n        toString: function() {\n\n            throw new Error('Declaration missing for virtual function.')\n        }\n    }\n\n    // Path segment implementations:\n    var Lineto = function() {\n\n        const args = []\n        const n = arguments.length\n        for (var i = 0; i < n; i++) {\n            args.push(arguments[i])\n        }\n\n        if (!(this instanceof Lineto)) { // switching context of `this` to Lineto when called without `new`\n            return applyToNew(Lineto, args)\n        }\n\n        if (n === 0) {\n            throw new Error('Lineto constructor expects 1 point or 2 coordinates (none provided).')\n        }\n\n        let outputArray\n\n        if (typeof args[0] === 'string' || typeof args[0] === 'number') { // coordinates provided\n            if (n === 2) {\n                this.end = new Point(+args[0], +args[1])\n                return this\n\n            } else if (n < 2) {\n                throw new Error(`Lineto constructor expects 1 point or 2 coordinates (${  n  } coordinates provided).`)\n\n            } else { // this is a poly-line segment\n                let segmentCoords\n                outputArray = []\n                for (i = 0; i < n; i += 2) { // coords come in groups of two\n\n                    segmentCoords = args.slice(i, i + 2) // will send one coord if args.length not divisible by 2\n                    outputArray.push(applyToNew(Lineto, segmentCoords))\n                }\n                return outputArray\n            }\n\n        } else { // points provided\n            if (n === 1) {\n                this.end = new Point(args[0])\n                return this\n\n            } else { // this is a poly-line segment\n                let segmentPoint\n                outputArray = []\n                for (i = 0; i < n; i += 1) {\n\n                    segmentPoint = args[i]\n                    outputArray.push(new Lineto(segmentPoint))\n                }\n                return outputArray\n            }\n        }\n    }\n\n    const linetoPrototype = {\n\n        clone: function() {\n\n            return new Lineto(this.end)\n        },\n\n        getSubdivisions: function() {\n\n            return []\n        },\n\n        isDifferentiable: function() {\n\n            if (!this.previousSegment) return false\n\n            return !this.start.equals(this.end)\n        },\n\n        scale: function(sx, sy, origin) {\n\n            this.end.scale(sx, sy, origin)\n            return this\n        },\n\n        translate: function(tx, ty) {\n\n            this.end.translate(tx, ty)\n            return this\n        },\n\n        type: 'L',\n\n        serialize: function() {\n\n            const {end} = this\n            return `${this.type  } ${  end.x  } ${  end.y}`\n        },\n\n        toString: function() {\n\n            return `${this.type  } ${  this.start  } ${  this.end}`\n        }\n    }\n\n    Object.defineProperty(linetoPrototype, 'start', {\n        // get a reference to the end point of previous segment\n\n        configurable: true,\n\n        enumerable: true,\n\n        get: function() {\n\n            if (!this.previousSegment) throw new Error('Missing previous segment. (This segment cannot be the first segment of a path; OR segment has not yet been added to a path.)')\n\n            return this.previousSegment.end\n        }\n    })\n\n    Lineto.prototype = extend(segmentPrototype, Line.prototype, linetoPrototype)\n\n    var Curveto = function() {\n\n        const args = []\n        const n = arguments.length\n        for (var i = 0; i < n; i++) {\n            args.push(arguments[i])\n        }\n\n        if (!(this instanceof Curveto)) { // switching context of `this` to Curveto when called without `new`\n            return applyToNew(Curveto, args)\n        }\n\n        if (n === 0) {\n            throw new Error('Curveto constructor expects 3 points or 6 coordinates (none provided).')\n        }\n\n        let outputArray\n\n        if (typeof args[0] === 'string' || typeof args[0] === 'number') { // coordinates provided\n            if (n === 6) {\n                this.controlPoint1 = new Point(+args[0], +args[1])\n                this.controlPoint2 = new Point(+args[2], +args[3])\n                this.end = new Point(+args[4], +args[5])\n                return this\n\n            } else if (n < 6) {\n                throw new Error(`Curveto constructor expects 3 points or 6 coordinates (${  n  } coordinates provided).`)\n\n            } else { // this is a poly-bezier segment\n                let segmentCoords\n                outputArray = []\n                for (i = 0; i < n; i += 6) { // coords come in groups of six\n\n                    segmentCoords = args.slice(i, i + 6) // will send fewer than six coords if args.length not divisible by 6\n                    outputArray.push(applyToNew(Curveto, segmentCoords))\n                }\n                return outputArray\n            }\n\n        } else { // points provided\n            if (n === 3) {\n                this.controlPoint1 = new Point(args[0])\n                this.controlPoint2 = new Point(args[1])\n                this.end = new Point(args[2])\n                return this\n\n            } else if (n < 3) {\n                throw new Error(`Curveto constructor expects 3 points or 6 coordinates (${  n  } points provided).`)\n\n            } else { // this is a poly-bezier segment\n                let segmentPoints\n                outputArray = []\n                for (i = 0; i < n; i += 3) { // points come in groups of three\n\n                    segmentPoints = args.slice(i, i + 3) // will send fewer than three points if args.length is not divisible by 3\n                    outputArray.push(applyToNew(Curveto, segmentPoints))\n                }\n                return outputArray\n            }\n        }\n    }\n\n    const curvetoPrototype = {\n\n        clone: function() {\n\n            return new Curveto(this.controlPoint1, this.controlPoint2, this.end)\n        },\n\n        isDifferentiable: function() {\n\n            if (!this.previousSegment) return false\n\n            const {start} = this\n            const control1 = this.controlPoint1\n            const control2 = this.controlPoint2\n            const {end} = this\n\n            return !(start.equals(control1) && control1.equals(control2) && control2.equals(end))\n        },\n\n        scale: function(sx, sy, origin) {\n\n            this.controlPoint1.scale(sx, sy, origin)\n            this.controlPoint2.scale(sx, sy, origin)\n            this.end.scale(sx, sy, origin)\n            return this\n        },\n\n        translate: function(tx, ty) {\n\n            this.controlPoint1.translate(tx, ty)\n            this.controlPoint2.translate(tx, ty)\n            this.end.translate(tx, ty)\n            return this\n        },\n\n        type: 'C',\n\n        serialize: function() {\n\n            const c1 = this.controlPoint1\n            const c2 = this.controlPoint2\n            const {end} = this\n            return `${this.type  } ${  c1.x  } ${  c1.y  } ${  c2.x  } ${  c2.y  } ${  end.x  } ${  end.y}`\n        },\n\n        toString: function() {\n\n            return `${this.type  } ${  this.start  } ${  this.controlPoint1  } ${  this.controlPoint2  } ${  this.end}`\n        }\n    }\n\n    Object.defineProperty(curvetoPrototype, 'start', {\n        // get a reference to the end point of previous segment\n\n        configurable: true,\n\n        enumerable: true,\n\n        get: function() {\n\n            if (!this.previousSegment) throw new Error('Missing previous segment. (This segment cannot be the first segment of a path; OR segment has not yet been added to a path.)')\n\n            return this.previousSegment.end\n        }\n    })\n\n    Curveto.prototype = extend(segmentPrototype, Curve.prototype, curvetoPrototype)\n\n    var Moveto = function() {\n\n        const args = []\n        const n = arguments.length\n        for (var i = 0; i < n; i++) {\n            args.push(arguments[i])\n        }\n\n        if (!(this instanceof Moveto)) { // switching context of `this` to Moveto when called without `new`\n            return applyToNew(Moveto, args)\n        }\n\n        if (n === 0) {\n            throw new Error('Moveto constructor expects 1 point or 2 coordinates (none provided).')\n        }\n\n        let outputArray\n\n        if (typeof args[0] === 'string' || typeof args[0] === 'number') { // coordinates provided\n            if (n === 2) {\n                this.end = new Point(+args[0], +args[1])\n                return this\n\n            } else if (n < 2) {\n                throw new Error(`Moveto constructor expects 1 point or 2 coordinates (${  n  } coordinates provided).`)\n\n            } else { // this is a moveto-with-subsequent-poly-line segment\n                let segmentCoords\n                outputArray = []\n                for (i = 0; i < n; i += 2) { // coords come in groups of two\n\n                    segmentCoords = args.slice(i, i + 2) // will send one coord if args.length not divisible by 2\n                    if (i === 0) outputArray.push(applyToNew(Moveto, segmentCoords))\n                    else outputArray.push(applyToNew(Lineto, segmentCoords))\n                }\n                return outputArray\n            }\n\n        } else { // points provided\n            if (n === 1) {\n                this.end = new Point(args[0])\n                return this\n\n            } else { // this is a moveto-with-subsequent-poly-line segment\n                let segmentPoint\n                outputArray = []\n                for (i = 0; i < n; i += 1) { // points come one by one\n\n                    segmentPoint = args[i]\n                    if (i === 0) outputArray.push(new Moveto(segmentPoint))\n                    else outputArray.push(new Lineto(segmentPoint))\n                }\n                return outputArray\n            }\n        }\n    }\n\n    const movetoPrototype = {\n\n        bbox: function() {\n\n            return null\n        },\n\n        clone: function() {\n\n            return new Moveto(this.end)\n        },\n\n        closestPoint: function() {\n\n            return this.end.clone()\n        },\n\n        closestPointNormalizedLength: function() {\n\n            return 0\n        },\n\n        closestPointLength: function() {\n\n            return 0\n        },\n\n        closestPointT: function() {\n\n            return 1\n        },\n\n        closestPointTangent: function() {\n\n            return null\n        },\n\n        equals: function(m) {\n\n            return this.end.equals(m.end)\n        },\n\n        getSubdivisions: function() {\n\n            return []\n        },\n\n        isDifferentiable: function() {\n\n            return false\n        },\n\n        isSubpathStart: true,\n\n        isVisible: false,\n\n        length: function() {\n\n            return 0\n        },\n\n        lengthAtT: function() {\n\n            return 0\n        },\n\n        pointAt: function() {\n\n            return this.end.clone()\n        },\n\n        pointAtLength: function() {\n\n            return this.end.clone()\n        },\n\n        pointAtT: function() {\n\n            return this.end.clone()\n        },\n\n        scale: function(sx, sy, origin) {\n\n            this.end.scale(sx, sy, origin)\n            return this\n        },\n\n        tangentAt: function() {\n\n            return null\n        },\n\n        tangentAtLength: function() {\n\n            return null\n        },\n\n        tangentAtT: function() {\n\n            return null\n        },\n\n        translate: function(tx, ty) {\n\n            this.end.translate(tx, ty)\n            return this\n        },\n\n        type: 'M',\n\n        serialize: function() {\n\n            const {end} = this\n            return `${this.type  } ${  end.x  } ${  end.y}`\n        },\n\n        toString: function() {\n\n            return `${this.type  } ${  this.end}`\n        }\n    }\n\n    Object.defineProperty(movetoPrototype, 'start', {\n\n        configurable: true,\n\n        enumerable: true,\n\n        get: function() {\n\n            throw new Error('Illegal access. Moveto segments should not need a start property.')\n        }\n    })\n\n    Moveto.prototype = extend(segmentPrototype, movetoPrototype) // does not inherit from any other geometry object\n\n    var Closepath = function() {\n\n        const args = []\n        const n = arguments.length\n        for (let i = 0; i < n; i++) {\n            args.push(arguments[i])\n        }\n\n        if (!(this instanceof Closepath)) { // switching context of `this` to Closepath when called without `new`\n            return applyToNew(Closepath, args)\n        }\n\n        if (n > 0) {\n            throw new Error('Closepath constructor expects no arguments.')\n        }\n\n        return this\n    }\n\n    const closepathPrototype = {\n\n        clone: function() {\n\n            return new Closepath()\n        },\n\n        getSubdivisions: function() {\n\n            return []\n        },\n\n        isDifferentiable: function() {\n\n            if (!this.previousSegment || !this.subpathStartSegment) return false\n\n            return !this.start.equals(this.end)\n        },\n\n        scale: function() {\n\n            return this\n        },\n\n        translate: function() {\n\n            return this\n        },\n\n        type: 'Z',\n\n        serialize: function() {\n\n            return this.type\n        },\n\n        toString: function() {\n\n            return `${this.type  } ${  this.start  } ${  this.end}`\n        }\n    }\n\n    Object.defineProperty(closepathPrototype, 'start', {\n        // get a reference to the end point of previous segment\n\n        configurable: true,\n\n        enumerable: true,\n\n        get: function() {\n\n            if (!this.previousSegment) throw new Error('Missing previous segment. (This segment cannot be the first segment of a path; OR segment has not yet been added to a path.)')\n\n            return this.previousSegment.end\n        }\n    })\n\n    Object.defineProperty(closepathPrototype, 'end', {\n        // get a reference to the end point of subpath start segment\n\n        configurable: true,\n\n        enumerable: true,\n\n        get: function() {\n\n            if (!this.subpathStartSegment) throw new Error('Missing subpath start segment. (This segment needs a subpath start segment (e.g. Moveto); OR segment has not yet been added to a path.)')\n\n            return this.subpathStartSegment.end\n        }\n    })\n\n    Closepath.prototype = extend(segmentPrototype, Line.prototype, closepathPrototype)\n\n    const segmentTypes = Path.segmentTypes = {\n        L: Lineto,\n        C: Curveto,\n        M: Moveto,\n        Z: Closepath,\n        z: Closepath\n    }\n\n    Path.regexSupportedData = new RegExp(`^[\\\\s\\\\d${  Object.keys(segmentTypes).join('')  },.]*$`)\n\n    Path.isDataSupported = function(d) {\n        if (typeof d !== 'string') return false\n        return this.regexSupportedData.test(d)\n    }\n\n})(g)\n\n// Vectorizer.\n// -----------\n\n// A tiny library for making your life easier when dealing with SVG.\n// The only Vectorizer dependency is the Geometry library.\n\nlet V // eslint-disable-line no-unused-vars\nlet Vectorizer // eslint-disable-line no-unused-vars\n\nV = Vectorizer = (function() {\n\n    \n\n    const hasSvg = typeof window === 'object' &&\n                !!(\n                    window.SVGAngle ||\n                    document.implementation.hasFeature('http://www.w3.org/TR/SVG11/feature#BasicStructure', '1.1')\n                )\n\n    // SVG support is required.\n    if (!hasSvg) {\n\n        // Return a function that throws an error when it is used.\n        return function() {\n            throw new Error('SVG is required to use Vectorizer.')\n        }\n    }\n\n    // XML namespaces.\n    const ns = {\n        xmlns: 'http://www.w3.org/2000/svg',\n        xml: 'http://www.w3.org/XML/1998/namespace',\n        xlink: 'http://www.w3.org/1999/xlink',\n        xhtml: 'http://www.w3.org/1999/xhtml'\n    }\n\n    const SVGversion = '1.1'\n\n    // Declare shorthands to the most used math functions.\n    const math = Math\n    const {PI} = math\n    const {atan2} = math\n    const {sqrt} = math\n    const {min} = math\n    const {max} = math\n    const {cos} = math\n    const {sin} = math\n\n    var V = function(el, attrs, children) {\n\n        // This allows using V() without the new keyword.\n        if (!(this instanceof V)) {\n            return V.apply(Object.create(V.prototype), arguments)\n        }\n\n        if (!el) return\n\n        if (V.isV(el)) {\n            el = el.node\n        }\n\n        attrs = attrs || {}\n\n        if (V.isString(el)) {\n\n            if (el.toLowerCase() === 'svg') {\n\n                // Create a new SVG canvas.\n                el = V.createSvgDocument()\n\n            } else if (el[0] === '<') {\n\n                // Create element from an SVG string.\n                // Allows constructs of type: `document.appendChild(V('<rect></rect>').node)`.\n\n                const svgDoc = V.createSvgDocument(el)\n\n                // Note that `V()` might also return an array should the SVG string passed as\n                // the first argument contain more than one root element.\n                if (svgDoc.childNodes.length > 1) {\n\n                    // Map child nodes to `V`s.\n                    const arrayOfVels = []\n                    let i; let len\n\n                    for (i = 0, len = svgDoc.childNodes.length; i < len; i++) {\n\n                        const childNode = svgDoc.childNodes[i]\n                        arrayOfVels.push(new V(document.importNode(childNode, true)))\n                    }\n\n                    return arrayOfVels\n                }\n\n                el = document.importNode(svgDoc.firstChild, true)\n\n            } else {\n\n                el = document.createElementNS(ns.xmlns, el)\n            }\n\n            V.ensureId(el)\n        }\n\n        this.node = el\n\n        this.setAttributes(attrs)\n\n        if (children) {\n            this.append(children)\n        }\n\n        return this\n    }\n\n    const VPrototype = V.prototype\n\n    Object.defineProperty(VPrototype, 'id', {\n        enumerable: true,\n        get: function() {\n            return this.node.id\n        },\n        set: function(id) {\n            this.node.id = id\n        }\n    })\n\n    /**\n     * @param {SVGGElement} toElem\n     * @returns {SVGMatrix}\n     */\n    VPrototype.getTransformToElement = function(toElem) {\n        toElem = V.toNode(toElem)\n        return toElem.getScreenCTM().inverse().multiply(this.node.getScreenCTM())\n    }\n\n    /**\n     * @param {SVGMatrix} matrix\n     * @param {Object=} opt\n     * @returns {Vectorizer|SVGMatrix} Setter / Getter\n     */\n    VPrototype.transform = function(matrix, opt) {\n\n        const {node} = this\n        if (V.isUndefined(matrix)) {\n            return V.transformStringToMatrix(this.attr('transform'))\n        }\n\n        if (opt && opt.absolute) {\n            return this.attr('transform', V.matrixToTransformString(matrix))\n        }\n\n        const svgTransform = V.createSVGTransform(matrix)\n        node.transform.baseVal.appendItem(svgTransform)\n        return this\n    }\n\n    VPrototype.translate = function(tx, ty, opt) {\n\n        opt = opt || {}\n        ty = ty || 0\n\n        let transformAttr = this.attr('transform') || ''\n        const transform = V.parseTransformString(transformAttr)\n        transformAttr = transform.value\n        // Is it a getter?\n        if (V.isUndefined(tx)) {\n            return transform.translate\n        }\n\n        transformAttr = transformAttr.replace(/translate\\([^)]*\\)/g, '').trim()\n\n        const newTx = opt.absolute ? tx : transform.translate.tx + tx\n        const newTy = opt.absolute ? ty : transform.translate.ty + ty\n        const newTranslate = `translate(${  newTx  },${  newTy  })`\n\n        // Note that `translate()` is always the first transformation. This is\n        // usually the desired case.\n        this.attr('transform', (`${newTranslate  } ${  transformAttr}`).trim())\n        return this\n    }\n\n    VPrototype.rotate = function(angle, cx, cy, opt) {\n\n        opt = opt || {}\n\n        let transformAttr = this.attr('transform') || ''\n        const transform = V.parseTransformString(transformAttr)\n        transformAttr = transform.value\n\n        // Is it a getter?\n        if (V.isUndefined(angle)) {\n            return transform.rotate\n        }\n\n        transformAttr = transformAttr.replace(/rotate\\([^)]*\\)/g, '').trim()\n\n        angle %= 360\n\n        const newAngle = opt.absolute ? angle : transform.rotate.angle + angle\n        const newOrigin = (cx !== undefined && cy !== undefined) ? `,${  cx  },${  cy}` : ''\n        const newRotate = `rotate(${  newAngle  }${newOrigin  })`\n\n        this.attr('transform', (`${transformAttr  } ${  newRotate}`).trim())\n        return this\n    }\n\n    // Note that `scale` as the only transformation does not combine with previous values.\n    VPrototype.scale = function(sx, sy) {\n\n        sy = V.isUndefined(sy) ? sx : sy\n\n        let transformAttr = this.attr('transform') || ''\n        const transform = V.parseTransformString(transformAttr)\n        transformAttr = transform.value\n\n        // Is it a getter?\n        if (V.isUndefined(sx)) {\n            return transform.scale\n        }\n\n        transformAttr = transformAttr.replace(/scale\\([^)]*\\)/g, '').trim()\n\n        const newScale = `scale(${  sx  },${  sy  })`\n\n        this.attr('transform', (`${transformAttr  } ${  newScale}`).trim())\n        return this\n    }\n\n    // Get SVGRect that contains coordinates and dimension of the real bounding box,\n    // i.e. after transformations are applied.\n    // If `target` is specified, bounding box will be computed relatively to `target` element.\n    VPrototype.bbox = function(withoutTransformations, target) {\n\n        let box\n        const {node} = this\n        const {ownerSVGElement} = node\n\n        // If the element is not in the live DOM, it does not have a bounding box defined and\n        // so fall back to 'zero' dimension element.\n        if (!ownerSVGElement) {\n            return new g.Rect(0, 0, 0, 0)\n        }\n\n        try {\n\n            box = node.getBBox()\n\n        } catch (e) {\n\n            // Fallback for IE.\n            box = {\n                x: node.clientLeft,\n                y: node.clientTop,\n                width: node.clientWidth,\n                height: node.clientHeight\n            }\n        }\n\n        if (withoutTransformations) {\n            return new g.Rect(box)\n        }\n\n        const matrix = this.getTransformToElement(target || ownerSVGElement)\n\n        return V.transformRect(box, matrix)\n    }\n\n    // Returns an SVGRect that contains coordinates and dimensions of the real bounding box,\n    // i.e. after transformations are applied.\n    // Fixes a browser implementation bug that returns incorrect bounding boxes for groups of svg elements.\n    // Takes an (Object) `opt` argument (optional) with the following attributes:\n    // (Object) `target` (optional): if not undefined, transform bounding boxes relative to `target`; if undefined, transform relative to this\n    // (Boolean) `recursive` (optional): if true, recursively enter all groups and get a union of element bounding boxes (svg bbox fix); if false or undefined, return result of native function this.node.getBBox();\n    VPrototype.getBBox = function(opt) {\n\n        const options = {}\n\n        let outputBBox\n        const {node} = this\n        const {ownerSVGElement} = node\n\n        // If the element is not in the live DOM, it does not have a bounding box defined and\n        // so fall back to 'zero' dimension element.\n        if (!ownerSVGElement) {\n            return new g.Rect(0, 0, 0, 0)\n        }\n\n        if (opt) {\n            if (opt.target) { // check if target exists\n                options.target = V.toNode(opt.target) // works for V objects, jquery objects, and node objects\n            }\n            if (opt.recursive) {\n                options.recursive = opt.recursive\n            }\n        }\n\n        if (!options.recursive) {\n            try {\n                outputBBox = node.getBBox()\n            } catch (e) {\n                // Fallback for IE.\n                outputBBox = {\n                    x: node.clientLeft,\n                    y: node.clientTop,\n                    width: node.clientWidth,\n                    height: node.clientHeight\n                }\n            }\n\n            if (!options.target) {\n                // transform like this (that is, not at all)\n                return new g.Rect(outputBBox)\n            } else {\n                // transform like target\n                const matrix = this.getTransformToElement(options.target)\n                return V.transformRect(outputBBox, matrix)\n            }\n        } else { // if we want to calculate the bbox recursively\n            // browsers report correct bbox around svg elements (one that envelops the path lines tightly)\n            // but some browsers fail to report the same bbox when the elements are in a group (returning a looser bbox that also includes control points, like node.getClientRect())\n            // this happens even if we wrap a single svg element into a group!\n            // this option setting makes the function recursively enter all the groups from this and deeper, get bboxes of the elements inside, then return a union of those bboxes\n\n            const children = this.children()\n            const n = children.length\n\n            if (n === 0) {\n                return this.getBBox({ target: options.target, recursive: false })\n            }\n\n            // recursion's initial pass-through setting:\n            // recursive passes-through just keep the target as whatever was set up here during the initial pass-through\n            if (!options.target) {\n                // transform children/descendants like this (their parent/ancestor)\n                options.target = this\n            } // else transform children/descendants like target\n\n            for (let i = 0; i < n; i++) {\n                const currentChild = children[i]\n\n                var childBBox\n\n                // if currentChild is not a group element, get its bbox with a nonrecursive call\n                if (currentChild.children().length === 0) {\n                    childBBox = currentChild.getBBox({ target: options.target, recursive: false })\n                }\n                else {\n                    // if currentChild is a group element (determined by checking the number of children), enter it with a recursive call\n                    childBBox = currentChild.getBBox({ target: options.target, recursive: true })\n                }\n\n                if (!outputBBox) {\n                    // if this is the first iteration\n                    outputBBox = childBBox\n                } else {\n                    // make a new bounding box rectangle that contains this child's bounding box and previous bounding box\n                    outputBBox = outputBBox.union(childBBox)\n                }\n            }\n\n            return outputBBox\n        }\n    }\n\n    // Text() helpers\n\n    function createTextPathNode(attrs, vel) {\n        attrs || (attrs = {})\n        const textPathElement = V('textPath')\n        const {d} = attrs\n        if (d && attrs['xlink:href'] === undefined) {\n            // If `opt.attrs` is a plain string, consider it to be directly the\n            // SVG path data for the text to go along (this is a shortcut).\n            // Otherwise if it is an object and contains the `d` property, then this is our path.\n            // Wrap the text in the SVG <textPath> element that points\n            // to a path defined by `opt.attrs` inside the `<defs>` element.\n            const linkedPath = V('path').attr('d', d).appendTo(vel.defs())\n            textPathElement.attr('xlink:href', `#${  linkedPath.id}`)\n        }\n        if (V.isObject(attrs)) {\n            // Set attributes on the `<textPath>`. The most important one\n            // is the `xlink:href` that points to our newly created `<path/>` element in `<defs/>`.\n            // Note that we also allow the following construct:\n            // `t.text('my text', { textPath: { 'xlink:href': '#my-other-path' } })`.\n            // In other words, one can completely skip the auto-creation of the path\n            // and use any other arbitrary path that is in the document.\n            textPathElement.attr(attrs)\n        }\n        return textPathElement.node\n    }\n\n    function annotateTextLine(lineNode, lineAnnotations, opt) {\n        opt || (opt = {})\n        const {includeAnnotationIndices} = opt\n        const {eol} = opt\n        const {lineHeight} = opt\n        const {baseSize} = opt\n        let maxFontSize = 0\n        const fontMetrics = {}\n        const lastJ = lineAnnotations.length - 1\n        for (let j = 0; j <= lastJ; j++) {\n            let annotation = lineAnnotations[j]\n            let fontSize = null\n            if (V.isObject(annotation)) {\n                const annotationAttrs = annotation.attrs\n                const vTSpan = V('tspan', annotationAttrs)\n                var tspanNode = vTSpan.node\n                let {t} = annotation\n                if (eol && j === lastJ) t += eol\n                tspanNode.textContent = t\n                // Per annotation className\n                const annotationClass = annotationAttrs.class\n                if (annotationClass) vTSpan.addClass(annotationClass)\n                // If `opt.includeAnnotationIndices` is `true`,\n                // set the list of indices of all the applied annotations\n                // in the `annotations` attribute. This list is a comma\n                // separated list of indices.\n                if (includeAnnotationIndices) vTSpan.attr('annotations', annotation.annotations)\n                // Check for max font size\n                fontSize = parseFloat(annotationAttrs['font-size'])\n                if (fontSize === undefined) fontSize = baseSize\n                if (fontSize && fontSize > maxFontSize) maxFontSize = fontSize\n            } else {\n                if (eol && j === lastJ) annotation += eol\n                tspanNode = document.createTextNode(annotation || ' ')\n                if (baseSize && baseSize > maxFontSize) maxFontSize = baseSize\n            }\n            lineNode.appendChild(tspanNode)\n        }\n\n        if (maxFontSize) fontMetrics.maxFontSize = maxFontSize\n        if (lineHeight) {\n            fontMetrics.lineHeight = lineHeight\n        } else if (maxFontSize) {\n            fontMetrics.lineHeight = (maxFontSize * 1.2)\n        }\n        return fontMetrics\n    }\n\n    const emRegex = /em$/\n\n    function convertEmToPx(em, fontSize) {\n        const numerical = parseFloat(em)\n        if (emRegex.test(em)) return numerical * fontSize\n        return numerical\n    }\n\n    function calculateDY(alignment, linesMetrics, baseSizePx, lineHeight) {\n        if (!Array.isArray(linesMetrics)) return 0\n        const n = linesMetrics.length\n        if (!n) return 0\n        let lineMetrics = linesMetrics[0]\n        const flMaxFont = convertEmToPx(lineMetrics.maxFontSize, baseSizePx) || baseSizePx\n        let rLineHeights = 0\n        const lineHeightPx = convertEmToPx(lineHeight, baseSizePx)\n        for (let i = 1; i < n; i++) {\n            lineMetrics = linesMetrics[i]\n            const iLineHeight = convertEmToPx(lineMetrics.lineHeight, baseSizePx) || lineHeightPx\n            rLineHeights += iLineHeight\n        }\n        const llMaxFont = convertEmToPx(lineMetrics.maxFontSize, baseSizePx) || baseSizePx\n        let dy\n        switch (alignment) {\n            case 'middle':\n                dy = (flMaxFont / 2) - (0.15 * llMaxFont) - (rLineHeights / 2)\n                break\n            case 'bottom':\n                dy = -(0.25 * llMaxFont) - rLineHeights\n                break\n            default:\n            case 'top':\n                dy = (0.8 * flMaxFont)\n                break\n        }\n        return dy\n    }\n\n    VPrototype.text = function(content, opt) {\n\n        if (content && typeof content !== 'string') throw new Error('Vectorizer: text() expects the first argument to be a string.')\n\n        // Replace all spaces with the Unicode No-break space (http://www.fileformat.info/info/unicode/char/a0/index.htm).\n        // IE would otherwise collapse all spaces into one.\n        content = V.sanitizeText(content)\n        opt || (opt = {})\n\n        // End of Line character\n        const {eol} = opt\n        // Text along path\n        let {textPath} = opt\n        // Vertical shift\n        const verticalAnchor = opt.textVerticalAnchor\n        const namedVerticalAnchor = (verticalAnchor === 'middle' || verticalAnchor === 'bottom' || verticalAnchor === 'top')\n        // Horizontal shift applied to all the lines but the first.\n        let {x} = opt\n        if (x === undefined) x = this.attr('x') || 0\n        // Annotations\n        const iai = opt.includeAnnotationIndices\n        let {annotations} = opt\n        if (annotations && !V.isArray(annotations)) annotations = [annotations]\n        // Shift all the <tspan> but first by one line (`1em`)\n        const defaultLineHeight = opt.lineHeight\n        const autoLineHeight = (defaultLineHeight === 'auto')\n        const lineHeight = (autoLineHeight) ? '1.5em' : (defaultLineHeight || '1em')\n        // Clearing the element\n        this.empty()\n        this.attr({\n            // Preserve spaces. In other words, we do not want consecutive spaces to get collapsed to one.\n            'xml:space': 'preserve',\n            // An empty text gets rendered into the DOM in webkit-based browsers.\n            // In order to unify this behaviour across all browsers\n            // we rather hide the text element when it's empty.\n            display: (content) ? null : 'none'\n        })\n        // Set default font-size if none\n        let fontSize = parseFloat(this.attr('font-size'))\n        if (!fontSize) {\n            fontSize = 16\n            if (namedVerticalAnchor || annotations) this.attr('font-size', fontSize)\n        }\n\n        const doc = document\n        let containerNode\n        if (textPath) {\n            // Now all the `<tspan>`s will be inside the `<textPath>`.\n            if (typeof textPath === 'string') textPath = { d: textPath }\n            containerNode = createTextPathNode(textPath, this)\n        } else {\n            containerNode = doc.createDocumentFragment()\n        }\n        let offset = 0\n        const lines = content.split('\\n')\n        const linesMetrics = []\n        let annotatedY\n        for (var i = 0, lastI = lines.length - 1; i <= lastI; i++) {\n            var dy = lineHeight\n            let lineClassName = 'v-line'\n            const lineNode = doc.createElementNS(V.namespace.xmlns, 'tspan')\n            let line = lines[i]\n            var lineMetrics\n            if (line) {\n                if (annotations) {\n                    // Find the *compacted* annotations for this line.\n                    const lineAnnotations = V.annotateString(line, annotations, {\n                        offset: -offset,\n                        includeAnnotationIndices: iai\n                    })\n                    lineMetrics = annotateTextLine(lineNode, lineAnnotations, {\n                        includeAnnotationIndices: iai,\n                        eol: (i !== lastI && eol),\n                        lineHeight: (autoLineHeight) ? null : lineHeight,\n                        baseSize: fontSize\n                    })\n                    // Get the line height based on the biggest font size in the annotations for this line.\n                    const iLineHeight = lineMetrics.lineHeight\n                    if (iLineHeight && autoLineHeight && i !== 0) dy = iLineHeight\n                    if (i === 0) annotatedY = lineMetrics.maxFontSize * 0.8\n                } else {\n                    if (eol && i !== lastI) line += eol\n                    lineNode.textContent = line\n                }\n            } else {\n                // Make sure the textContent is never empty. If it is, add a dummy\n                // character and make it invisible, making the following lines correctly\n                // relatively positioned. `dy=1em` won't work with empty lines otherwise.\n                lineNode.textContent = '-'\n                lineClassName += ' v-empty-line'\n                // 'opacity' needs to be specified with fill, stroke. Opacity without specification\n                // is not applied in Firefox\n                const lineNodeStyle = lineNode.style\n                lineNodeStyle.fillOpacity = 0\n                lineNodeStyle.strokeOpacity = 0\n                if (annotations) lineMetrics = {}\n            }\n            if (lineMetrics) linesMetrics.push(lineMetrics)\n            if (i > 0) lineNode.setAttribute('dy', dy)\n            // Firefox requires 'x' to be set on the first line when inside a text path\n            if (i > 0 || textPath) lineNode.setAttribute('x', x)\n            lineNode.className.baseVal = lineClassName\n            containerNode.appendChild(lineNode)\n            offset += line.length + 1      // + 1 = newline character.\n        }\n        // Y Alignment calculation\n        if (namedVerticalAnchor) {\n            if (annotations) {\n                dy = calculateDY(verticalAnchor, linesMetrics, fontSize, lineHeight)\n            } else if (verticalAnchor === 'top') {\n                // A shortcut for top alignment. It does not depend on font-size nor line-height\n                dy = '0.8em'\n            } else {\n                let rh // remaining height\n                if (lastI > 0) {\n                    rh = parseFloat(lineHeight) || 1\n                    rh *= lastI\n                    if (!emRegex.test(lineHeight)) rh /= fontSize\n                } else {\n                    // Single-line text\n                    rh = 0\n                }\n                switch (verticalAnchor) {\n                    case 'middle':\n                        dy = `${0.3 - (rh / 2)  }em`\n                        break\n                    case 'bottom':\n                        dy = `${-rh - 0.3  }em`\n                        break\n                }\n            }\n        } else if (verticalAnchor === 0) {\n                dy = '0em'\n            } else if (verticalAnchor) {\n                dy = verticalAnchor\n            } else {\n                // No vertical anchor is defined\n                dy = 0\n                // Backwards compatibility - we change the `y` attribute instead of `dy`.\n                if (this.attr('y') === null) this.attr('y', annotatedY || '0.8em')\n            }\n        containerNode.firstChild.setAttribute('dy', dy)\n        // Appending lines to the element.\n        this.append(containerNode)\n        return this\n    }\n\n    /**\n     * @public\n     * @param {string} name\n     * @returns {Vectorizer}\n     */\n    VPrototype.removeAttr = function(name) {\n\n        const qualifiedName = V.qualifyAttr(name)\n        const el = this.node\n\n        if (qualifiedName.ns) {\n            if (el.hasAttributeNS(qualifiedName.ns, qualifiedName.local)) {\n                el.removeAttributeNS(qualifiedName.ns, qualifiedName.local)\n            }\n        } else if (el.hasAttribute(name)) {\n            el.removeAttribute(name)\n        }\n        return this\n    }\n\n    VPrototype.attr = function(name, value) {\n\n        if (V.isUndefined(name)) {\n\n            // Return all attributes.\n            const {attributes} = this.node\n            const attrs = {}\n\n            for (let i = 0; i < attributes.length; i++) {\n                attrs[attributes[i].name] = attributes[i].value\n            }\n\n            return attrs\n        }\n\n        if (V.isString(name) && V.isUndefined(value)) {\n            return this.node.getAttribute(name)\n        }\n\n        if (typeof name === 'object') {\n\n            for (const attrName in name) {\n                if (name.hasOwnProperty(attrName)) {\n                    this.setAttribute(attrName, name[attrName])\n                }\n            }\n\n        } else {\n\n            this.setAttribute(name, value)\n        }\n\n        return this\n    }\n\n    VPrototype.normalizePath = function() {\n\n        const tagName = this.tagName()\n        if (tagName === 'PATH') {\n            this.attr('d', V.normalizePathData(this.attr('d')))\n        }\n\n        return this\n    }\n\n    VPrototype.remove = function() {\n\n        if (this.node.parentNode) {\n            this.node.parentNode.removeChild(this.node)\n        }\n\n        return this\n    }\n\n    VPrototype.empty = function() {\n\n        while (this.node.firstChild) {\n            this.node.removeChild(this.node.firstChild)\n        }\n\n        return this\n    }\n\n    /**\n     * @private\n     * @param {object} attrs\n     * @returns {Vectorizer}\n     */\n    VPrototype.setAttributes = function(attrs) {\n\n        for (const key in attrs) {\n            if (attrs.hasOwnProperty(key)) {\n                this.setAttribute(key, attrs[key])\n            }\n        }\n\n        return this\n    }\n\n    VPrototype.append = function(els) {\n\n        if (!V.isArray(els)) {\n            els = [els]\n        }\n\n        for (let i = 0, len = els.length; i < len; i++) {\n            this.node.appendChild(V.toNode(els[i]))\n        }\n\n        return this\n    }\n\n    VPrototype.prepend = function(els) {\n\n        const child = this.node.firstChild\n        return child ? V(child).before(els) : this.append(els)\n    }\n\n    VPrototype.before = function(els) {\n\n        const {node} = this\n        const parent = node.parentNode\n\n        if (parent) {\n\n            if (!V.isArray(els)) {\n                els = [els]\n            }\n\n            for (let i = 0, len = els.length; i < len; i++) {\n                parent.insertBefore(V.toNode(els[i]), node)\n            }\n        }\n\n        return this\n    }\n\n    VPrototype.appendTo = function(node) {\n        V.toNode(node).appendChild(this.node)\n        return this\n    },\n\n    VPrototype.svg = function() {\n\n        return this.node instanceof window.SVGSVGElement ? this : V(this.node.ownerSVGElement)\n    }\n\n    VPrototype.tagName = function() {\n\n        return this.node.tagName.toUpperCase()\n    }\n\n    VPrototype.defs = function() {\n        const context = this.svg() || this\n        const defsNode = context.node.getElementsByTagName('defs')[0]\n        if (defsNode) return V(defsNode)\n        return V('defs').appendTo(context)\n    }\n\n    VPrototype.clone = function() {\n\n        const clone = V(this.node.cloneNode(true/* deep */))\n        // Note that clone inherits also ID. Therefore, we need to change it here.\n        clone.node.id = V.uniqueId()\n        return clone\n    }\n\n    VPrototype.findOne = function(selector) {\n\n        const found = this.node.querySelector(selector)\n        return found ? V(found) : undefined\n    }\n\n    VPrototype.find = function(selector) {\n\n        const vels = []\n        const nodes = this.node.querySelectorAll(selector)\n\n        if (nodes) {\n\n            // Map DOM elements to `V`s.\n            for (let i = 0; i < nodes.length; i++) {\n                vels.push(V(nodes[i]))\n            }\n        }\n\n        return vels\n    }\n\n    // Returns an array of V elements made from children of this.node.\n    VPrototype.children = function() {\n\n        const children = this.node.childNodes\n\n        const outputArray = []\n        for (let i = 0; i < children.length; i++) {\n            const currentChild = children[i]\n            if (currentChild.nodeType === 1) {\n                outputArray.push(V(children[i]))\n            }\n        }\n        return outputArray\n    }\n\n    // Find an index of an element inside its container.\n    VPrototype.index = function() {\n\n        let index = 0\n        let node = this.node.previousSibling\n\n        while (node) {\n            // nodeType 1 for ELEMENT_NODE\n            if (node.nodeType === 1) index++\n            node = node.previousSibling\n        }\n\n        return index\n    }\n\n    VPrototype.findParentByClass = function(className, terminator) {\n\n        const {ownerSVGElement} = this.node\n        let node = this.node.parentNode\n\n        while (node && node !== terminator && node !== ownerSVGElement) {\n\n            const vel = V(node)\n            if (vel.hasClass(className)) {\n                return vel\n            }\n\n            node = node.parentNode\n        }\n\n        return null\n    }\n\n    // https://jsperf.com/get-common-parent\n    VPrototype.contains = function(el) {\n\n        const a = this.node\n        const b = V.toNode(el)\n        const bup = b && b.parentNode\n\n        return (a === bup) || !!(bup && bup.nodeType === 1 && (a.compareDocumentPosition(bup) & 16))\n    }\n\n    // Convert global point into the coordinate space of this element.\n    VPrototype.toLocalPoint = function(x, y) {\n\n        const svg = this.svg().node\n\n        const p = svg.createSVGPoint()\n        p.x = x\n        p.y = y\n\n        try {\n\n            var globalPoint = p.matrixTransform(svg.getScreenCTM().inverse())\n            var globalToLocalMatrix = this.getTransformToElement(svg).inverse()\n\n        } catch (e) {\n            // IE9 throws an exception in odd cases. (`Unexpected call to method or property access`)\n            // We have to make do with the original coordianates.\n            return p\n        }\n\n        return globalPoint.matrixTransform(globalToLocalMatrix)\n    }\n\n    VPrototype.translateCenterToPoint = function(p) {\n\n        const bbox = this.getBBox({ target: this.svg() })\n        const center = bbox.center()\n\n        this.translate(p.x - center.x, p.y - center.y)\n        return this\n    }\n\n    // Efficiently auto-orient an element. This basically implements the orient=auto attribute\n    // of markers. The easiest way of understanding on what this does is to imagine the element is an\n    // arrowhead. Calling this method on the arrowhead makes it point to the `position` point while\n    // being auto-oriented (properly rotated) towards the `reference` point.\n    // `target` is the element relative to which the transformations are applied. Usually a viewport.\n    VPrototype.translateAndAutoOrient = function(position, reference, target) {\n\n        // Clean-up previously set transformations except the scale. If we didn't clean up the\n        // previous transformations then they'd add up with the old ones. Scale is an exception as\n        // it doesn't add up, consider: `this.scale(2).scale(2).scale(2)`. The result is that the\n        // element is scaled by the factor 2, not 8.\n\n        const s = this.scale()\n        this.attr('transform', '')\n        this.scale(s.sx, s.sy)\n\n        const svg = this.svg().node\n        const bbox = this.getBBox({ target: target || svg })\n\n        // 1. Translate to origin.\n        const translateToOrigin = svg.createSVGTransform()\n        translateToOrigin.setTranslate(-bbox.x - bbox.width / 2, -bbox.y - bbox.height / 2)\n\n        // 2. Rotate around origin.\n        const rotateAroundOrigin = svg.createSVGTransform()\n        const angle = (new g.Point(position)).changeInAngle(position.x - reference.x, position.y - reference.y, reference)\n        rotateAroundOrigin.setRotate(angle, 0, 0)\n\n        // 3. Translate to the `position` + the offset (half my width) towards the `reference` point.\n        const translateFinal = svg.createSVGTransform()\n        const finalPosition = (new g.Point(position)).move(reference, bbox.width / 2)\n        translateFinal.setTranslate(position.x + (position.x - finalPosition.x), position.y + (position.y - finalPosition.y))\n\n        // 4. Apply transformations.\n        const ctm = this.getTransformToElement(target || svg)\n        const transform = svg.createSVGTransform()\n        transform.setMatrix(\n            translateFinal.matrix.multiply(\n                rotateAroundOrigin.matrix.multiply(\n                    translateToOrigin.matrix.multiply(\n                        ctm)))\n        )\n\n        // Instead of directly setting the `matrix()` transform on the element, first, decompose\n        // the matrix into separate transforms. This allows us to use normal Vectorizer methods\n        // as they don't work on matrices. An example of this is to retrieve a scale of an element.\n        // this.node.transform.baseVal.initialize(transform);\n\n        const decomposition = V.decomposeMatrix(transform.matrix)\n\n        this.translate(decomposition.translateX, decomposition.translateY)\n        this.rotate(decomposition.rotation)\n        // Note that scale has been already applied, hence the following line stays commented. (it's here just for reference).\n        //this.scale(decomposition.scaleX, decomposition.scaleY);\n\n        return this\n    }\n\n    VPrototype.animateAlongPath = function(attrs, path) {\n\n        path = V.toNode(path)\n\n        const id = V.ensureId(path)\n        const animateMotion = V('animateMotion', attrs)\n        const mpath = V('mpath', { 'xlink:href': `#${  id}` })\n\n        animateMotion.append(mpath)\n\n        this.append(animateMotion)\n        try {\n            animateMotion.node.beginElement()\n        } catch (e) {\n            // Fallback for IE 9.\n            // Run the animation programatically if FakeSmile (`http://leunen.me/fakesmile/`) present\n            if (document.documentElement.getAttribute('smiling') === 'fake') {\n                /* global getTargets:true, Animator:true, animators:true id2anim:true */\n                // Register the animation. (See `https://answers.launchpad.net/smil/+question/203333`)\n                const animation = animateMotion.node\n                animation.animators = []\n\n                const animationID = animation.getAttribute('id')\n                if (animationID) id2anim[animationID] = animation\n\n                const targets = getTargets(animation)\n                for (let i = 0, len = targets.length; i < len; i++) {\n                    const target = targets[i]\n                    const animator = new Animator(animation, target, i)\n                    animators.push(animator)\n                    animation.animators[i] = animator\n                    animator.register()\n                }\n            }\n        }\n        return this\n    }\n\n    VPrototype.hasClass = function(className) {\n\n        return new RegExp(`(\\\\s|^)${  className  }(\\\\s|$)`).test(this.node.getAttribute('class'))\n    }\n\n    VPrototype.addClass = function(className) {\n\n        if (!this.hasClass(className)) {\n            const prevClasses = this.node.getAttribute('class') || ''\n            this.node.setAttribute('class', (`${prevClasses  } ${  className}`).trim())\n        }\n\n        return this\n    }\n\n    VPrototype.removeClass = function(className) {\n\n        if (this.hasClass(className)) {\n            const newClasses = this.node.getAttribute('class').replace(new RegExp(`(\\\\s|^)${  className  }(\\\\s|$)`, 'g'), '$2')\n            this.node.setAttribute('class', newClasses)\n        }\n\n        return this\n    }\n\n    VPrototype.toggleClass = function(className, toAdd) {\n\n        const toRemove = V.isUndefined(toAdd) ? this.hasClass(className) : !toAdd\n\n        if (toRemove) {\n            this.removeClass(className)\n        } else {\n            this.addClass(className)\n        }\n\n        return this\n    }\n\n    // Interpolate path by discrete points. The precision of the sampling\n    // is controlled by `interval`. In other words, `sample()` will generate\n    // a point on the path starting at the beginning of the path going to the end\n    // every `interval` pixels.\n    // The sampler can be very useful for e.g. finding intersection between two\n    // paths (finding the two closest points from two samples).\n    VPrototype.sample = function(interval) {\n\n        interval = interval || 1\n        const {node} = this\n        const length = node.getTotalLength()\n        const samples = []\n        let distance = 0\n        let sample\n        while (distance < length) {\n            sample = node.getPointAtLength(distance)\n            samples.push({ x: sample.x, y: sample.y, distance: distance })\n            distance += interval\n        }\n        return samples\n    }\n\n    VPrototype.convertToPath = function() {\n\n        const path = V('path')\n        path.attr(this.attr())\n        const d = this.convertToPathData()\n        if (d) {\n            path.attr('d', d)\n        }\n        return path\n    }\n\n    VPrototype.convertToPathData = function() {\n\n        const tagName = this.tagName()\n\n        switch (tagName) {\n            case 'PATH':\n                return this.attr('d')\n            case 'LINE':\n                return V.convertLineToPathData(this.node)\n            case 'POLYGON':\n                return V.convertPolygonToPathData(this.node)\n            case 'POLYLINE':\n                return V.convertPolylineToPathData(this.node)\n            case 'ELLIPSE':\n                return V.convertEllipseToPathData(this.node)\n            case 'CIRCLE':\n                return V.convertCircleToPathData(this.node)\n            case 'RECT':\n                return V.convertRectToPathData(this.node)\n        }\n\n        throw new Error(`${tagName  } cannot be converted to PATH.`)\n    }\n\n    V.prototype.toGeometryShape = function() {\n        let x; let y; let width; let height; let cx; let cy; let r; let rx; let ry; let points; let d; let x1; let x2; let y1; let y2\n        switch (this.tagName()) {\n\n            case 'RECT':\n                x = parseFloat(this.attr('x')) || 0\n                y = parseFloat(this.attr('y')) || 0\n                width = parseFloat(this.attr('width')) || 0\n                height = parseFloat(this.attr('height')) || 0\n                return new g.Rect(x, y, width, height)\n\n            case 'CIRCLE':\n                cx = parseFloat(this.attr('cx')) || 0\n                cy = parseFloat(this.attr('cy')) || 0\n                r = parseFloat(this.attr('r')) || 0\n                return new g.Ellipse({ x: cx, y: cy }, r, r)\n\n            case 'ELLIPSE':\n                cx = parseFloat(this.attr('cx')) || 0\n                cy = parseFloat(this.attr('cy')) || 0\n                rx = parseFloat(this.attr('rx')) || 0\n                ry = parseFloat(this.attr('ry')) || 0\n                return new g.Ellipse({ x: cx, y: cy }, rx, ry)\n\n            case 'POLYLINE':\n                points = V.getPointsFromSvgNode(this)\n                return new g.Polyline(points)\n\n            case 'POLYGON':\n                points = V.getPointsFromSvgNode(this)\n                if (points.length > 1) points.push(points[0])\n                return new g.Polyline(points)\n\n            case 'PATH':\n                d = this.attr('d')\n                if (!g.Path.isDataSupported(d)) d = V.normalizePathData(d)\n                return new g.Path(d)\n\n            case 'LINE':\n                x1 = parseFloat(this.attr('x1')) || 0\n                y1 = parseFloat(this.attr('y1')) || 0\n                x2 = parseFloat(this.attr('x2')) || 0\n                y2 = parseFloat(this.attr('y2')) || 0\n                return new g.Line({ x: x1, y: y1 }, { x: x2, y: y2 })\n        }\n\n        // Anything else is a rectangle\n        return this.getBBox()\n    },\n\n    // Find the intersection of a line starting in the center\n    // of the SVG `node` ending in the point `ref`.\n    // `target` is an SVG element to which `node`s transformations are relative to.\n    // In JointJS, `target` is the `paper.viewport` SVG group element.\n    // Note that `ref` point must be in the coordinate system of the `target` for this function to work properly.\n    // Returns a point in the `target` coordinte system (the same system as `ref` is in) if\n    // an intersection is found. Returns `undefined` otherwise.\n    VPrototype.findIntersection = function(ref, target) {\n\n        const svg = this.svg().node\n        target = target || svg\n        const bbox = this.getBBox({ target: target })\n        const center = bbox.center()\n\n        if (!bbox.intersectionWithLineFromCenterToPoint(ref)) return undefined\n\n        let spot\n        const tagName = this.tagName()\n\n        // Little speed up optimalization for `<rect>` element. We do not do conversion\n        // to path element and sampling but directly calculate the intersection through\n        // a transformed geometrical rectangle.\n        if (tagName === 'RECT') {\n\n            const gRect = new g.Rect(\n                parseFloat(this.attr('x') || 0),\n                parseFloat(this.attr('y') || 0),\n                parseFloat(this.attr('width')),\n                parseFloat(this.attr('height'))\n            )\n            // Get the rect transformation matrix with regards to the SVG document.\n            const rectMatrix = this.getTransformToElement(target)\n            // Decompose the matrix to find the rotation angle.\n            const rectMatrixComponents = V.decomposeMatrix(rectMatrix)\n            // Now we want to rotate the rectangle back so that we\n            // can use `intersectionWithLineFromCenterToPoint()` passing the angle as the second argument.\n            const resetRotation = svg.createSVGTransform()\n            resetRotation.setRotate(-rectMatrixComponents.rotation, center.x, center.y)\n            const rect = V.transformRect(gRect, resetRotation.matrix.multiply(rectMatrix))\n            spot = (new g.Rect(rect)).intersectionWithLineFromCenterToPoint(ref, rectMatrixComponents.rotation)\n\n        } else if (tagName === 'PATH' || tagName === 'POLYGON' || tagName === 'POLYLINE' || tagName === 'CIRCLE' || tagName === 'ELLIPSE') {\n\n            const pathNode = (tagName === 'PATH') ? this : this.convertToPath()\n            const samples = pathNode.sample()\n            let minDistance = Infinity\n            let closestSamples = []\n\n            let i; let sample; let gp; let centerDistance; let refDistance; let distance\n\n            for (i = 0; i < samples.length; i++) {\n\n                sample = samples[i]\n                // Convert the sample point in the local coordinate system to the global coordinate system.\n                gp = V.createSVGPoint(sample.x, sample.y)\n                gp = gp.matrixTransform(this.getTransformToElement(target))\n                sample = new g.Point(gp)\n                centerDistance = sample.distance(center)\n                // Penalize a higher distance to the reference point by 10%.\n                // This gives better results. This is due to\n                // inaccuracies introduced by rounding errors and getPointAtLength() returns.\n                refDistance = sample.distance(ref) * 1.1\n                distance = centerDistance + refDistance\n\n                if (distance < minDistance) {\n                    minDistance = distance\n                    closestSamples = [{ sample: sample, refDistance: refDistance }]\n                } else if (distance < minDistance + 1) {\n                    closestSamples.push({ sample: sample, refDistance: refDistance })\n                }\n            }\n\n            closestSamples.sort(function(a, b) {\n                return a.refDistance - b.refDistance\n            })\n\n            if (closestSamples[0]) {\n                spot = closestSamples[0].sample\n            }\n        }\n\n        return spot\n    }\n\n    /**\n     * @private\n     * @param {string} name\n     * @param {string} value\n     * @returns {Vectorizer}\n     */\n    VPrototype.setAttribute = function(name, value) {\n\n        const el = this.node\n\n        if (value === null) {\n            this.removeAttr(name)\n            return this\n        }\n\n        const qualifiedName = V.qualifyAttr(name)\n\n        if (qualifiedName.ns) {\n            // Attribute names can be namespaced. E.g. `image` elements\n            // have a `xlink:href` attribute to set the source of the image.\n            el.setAttributeNS(qualifiedName.ns, name, value)\n        } else if (name === 'id') {\n            el.id = value\n        } else {\n            el.setAttribute(name, value)\n        }\n\n        return this\n    }\n\n    // Create an SVG document element.\n    // If `content` is passed, it will be used as the SVG content of the `<svg>` root element.\n    V.createSvgDocument = function(content) {\n\n        const svg = `<svg xmlns=\"${  ns.xmlns  }\" xmlns:xlink=\"${  ns.xlink  }\" version=\"${  SVGversion  }\">${  content || ''  }</svg>`\n        const xml = V.parseXML(svg, { async: false })\n        return xml.documentElement\n    }\n\n    V.idCounter = 0\n\n    // A function returning a unique identifier for this client session with every call.\n    V.uniqueId = function() {\n\n        return `v-${  ++V.idCounter}`\n    }\n\n    V.toNode = function(el) {\n\n        return V.isV(el) ? el.node : (el.nodeName && el || el[0])\n    }\n\n    V.ensureId = function(node) {\n\n        node = V.toNode(node)\n        return node.id || (node.id = V.uniqueId())\n    }\n\n    // Replace all spaces with the Unicode No-break space (http://www.fileformat.info/info/unicode/char/a0/index.htm).\n    // IE would otherwise collapse all spaces into one. This is used in the text() method but it is\n    // also exposed so that the programmer can use it in case he needs to. This is useful e.g. in tests\n    // when you want to compare the actual DOM text content without having to add the unicode character in\n    // the place of all spaces.\n    V.sanitizeText = function(text) {\n\n        return (text || '').replace(/ /g, '\\u00A0')\n    }\n\n    V.isUndefined = function(value) {\n\n        return typeof value === 'undefined'\n    }\n\n    V.isString = function(value) {\n\n        return typeof value === 'string'\n    }\n\n    V.isObject = function(value) {\n\n        return value && (typeof value === 'object')\n    }\n\n    V.isArray = Array.isArray\n\n    V.parseXML = function(data, opt) {\n\n        opt = opt || {}\n\n        let xml\n\n        try {\n            const parser = new DOMParser()\n\n            if (!V.isUndefined(opt.async)) {\n                parser.async = opt.async\n            }\n\n            xml = parser.parseFromString(data, 'text/xml')\n        } catch (error) {\n            xml = undefined\n        }\n\n        if (!xml || xml.getElementsByTagName('parsererror').length) {\n            throw new Error(`Invalid XML: ${  data}`)\n        }\n\n        return xml\n    }\n\n    /**\n     * @param {string} name\n     * @returns {{ns: string|null, local: string}} namespace and attribute name\n     */\n    V.qualifyAttr = function(name) {\n\n        if (name.indexOf(':') !== -1) {\n            const combinedKey = name.split(':')\n            return {\n                ns: ns[combinedKey[0]],\n                local: combinedKey[1]\n            }\n        }\n\n        return {\n            ns: null,\n            local: name\n        }\n    }\n\n    V.transformRegex = /(\\w+)\\(([^,)]+),?([^)]+)?\\)/gi\n    V.transformSeparatorRegex = /[ ,]+/\n    V.transformationListRegex = /^(\\w+)\\((.*)\\)/\n\n    V.transformStringToMatrix = function(transform) {\n\n        let transformationMatrix = V.createSVGMatrix()\n        const matches = transform && transform.match(V.transformRegex)\n        if (!matches) {\n            return transformationMatrix\n        }\n\n        for (let i = 0, n = matches.length; i < n; i++) {\n            const transformationString = matches[i]\n\n            const transformationMatch = transformationString.match(V.transformationListRegex)\n            if (transformationMatch) {\n                var sx; var sy; var tx; var ty; var angle\n                let ctm = V.createSVGMatrix()\n                const args = transformationMatch[2].split(V.transformSeparatorRegex)\n                switch (transformationMatch[1].toLowerCase()) {\n                    case 'scale':\n                        sx = parseFloat(args[0])\n                        sy = (args[1] === undefined) ? sx : parseFloat(args[1])\n                        ctm = ctm.scaleNonUniform(sx, sy)\n                        break\n                    case 'translate':\n                        tx = parseFloat(args[0])\n                        ty = parseFloat(args[1])\n                        ctm = ctm.translate(tx, ty)\n                        break\n                    case 'rotate':\n                        angle = parseFloat(args[0])\n                        tx = parseFloat(args[1]) || 0\n                        ty = parseFloat(args[2]) || 0\n                        if (tx !== 0 || ty !== 0) {\n                            ctm = ctm.translate(tx, ty).rotate(angle).translate(-tx, -ty)\n                        } else {\n                            ctm = ctm.rotate(angle)\n                        }\n                        break\n                    case 'skewx':\n                        angle = parseFloat(args[0])\n                        ctm = ctm.skewX(angle)\n                        break\n                    case 'skewy':\n                        angle = parseFloat(args[0])\n                        ctm = ctm.skewY(angle)\n                        break\n                    case 'matrix':\n                        ctm.a = parseFloat(args[0])\n                        ctm.b = parseFloat(args[1])\n                        ctm.c = parseFloat(args[2])\n                        ctm.d = parseFloat(args[3])\n                        ctm.e = parseFloat(args[4])\n                        ctm.f = parseFloat(args[5])\n                        break\n                    default:\n                        continue\n                }\n\n                transformationMatrix = transformationMatrix.multiply(ctm)\n            }\n\n        }\n        return transformationMatrix\n    }\n\n    V.matrixToTransformString = function(matrix) {\n        matrix || (matrix = true)\n\n        return `matrix(${ \n            matrix.a !== undefined ? matrix.a : 1  },${ \n            matrix.b !== undefined ? matrix.b : 0  },${ \n            matrix.c !== undefined ? matrix.c : 0  },${ \n            matrix.d !== undefined ? matrix.d : 1  },${ \n            matrix.e !== undefined ? matrix.e : 0  },${ \n            matrix.f !== undefined ? matrix.f : 0 \n            })`\n    }\n\n    V.parseTransformString = function(transform) {\n\n        let translate; let rotate; let scale\n\n        if (transform) {\n\n            const separator = V.transformSeparatorRegex\n\n            // Allow reading transform string with a single matrix\n            if (transform.trim().indexOf('matrix') >= 0) {\n\n                const matrix = V.transformStringToMatrix(transform)\n                const decomposedMatrix = V.decomposeMatrix(matrix)\n\n                translate = [decomposedMatrix.translateX, decomposedMatrix.translateY]\n                scale = [decomposedMatrix.scaleX, decomposedMatrix.scaleY]\n                rotate = [decomposedMatrix.rotation]\n\n                const transformations = []\n                if (translate[0] !== 0 ||  translate[0] !== 0) {\n                    transformations.push(`translate(${  translate  })`)\n                }\n                if (scale[0] !== 1 ||  scale[1] !== 1) {\n                    transformations.push(`scale(${  scale  })`)\n                }\n                if (rotate[0] !== 0) {\n                    transformations.push(`rotate(${  rotate  })`)\n                }\n                transform = transformations.join(' ')\n\n            } else {\n\n                const translateMatch = transform.match(/translate\\((.*?)\\)/)\n                if (translateMatch) {\n                    translate = translateMatch[1].split(separator)\n                }\n                const rotateMatch = transform.match(/rotate\\((.*?)\\)/)\n                if (rotateMatch) {\n                    rotate = rotateMatch[1].split(separator)\n                }\n                const scaleMatch = transform.match(/scale\\((.*?)\\)/)\n                if (scaleMatch) {\n                    scale = scaleMatch[1].split(separator)\n                }\n            }\n        }\n\n        const sx = (scale && scale[0]) ? parseFloat(scale[0]) : 1\n\n        return {\n            value: transform,\n            translate: {\n                tx: (translate && translate[0]) ? parseInt(translate[0], 10) : 0,\n                ty: (translate && translate[1]) ? parseInt(translate[1], 10) : 0\n            },\n            rotate: {\n                angle: (rotate && rotate[0]) ? parseInt(rotate[0], 10) : 0,\n                cx: (rotate && rotate[1]) ? parseInt(rotate[1], 10) : undefined,\n                cy: (rotate && rotate[2]) ? parseInt(rotate[2], 10) : undefined\n            },\n            scale: {\n                sx: sx,\n                sy: (scale && scale[1]) ? parseFloat(scale[1]) : sx\n            }\n        }\n    }\n\n    V.deltaTransformPoint = function(matrix, point) {\n\n        const dx = point.x * matrix.a + point.y * matrix.c + 0\n        const dy = point.x * matrix.b + point.y * matrix.d + 0\n        return { x: dx, y: dy }\n    }\n\n    V.decomposeMatrix = function(matrix) {\n\n        // @see https://gist.github.com/2052247\n\n        // calculate delta transform point\n        const px = V.deltaTransformPoint(matrix, { x: 0, y: 1 })\n        const py = V.deltaTransformPoint(matrix, { x: 1, y: 0 })\n\n        // calculate skew\n        const skewX = ((180 / PI) * atan2(px.y, px.x) - 90)\n        const skewY = ((180 / PI) * atan2(py.y, py.x))\n\n        return {\n\n            translateX: matrix.e,\n            translateY: matrix.f,\n            scaleX: sqrt(matrix.a * matrix.a + matrix.b * matrix.b),\n            scaleY: sqrt(matrix.c * matrix.c + matrix.d * matrix.d),\n            skewX: skewX,\n            skewY: skewY,\n            rotation: skewX // rotation is the same as skew x\n        }\n    }\n\n    // Return the `scale` transformation from the following equation:\n    // `translate(tx, ty) . rotate(angle) . scale(sx, sy) === matrix(a,b,c,d,e,f)`\n    V.matrixToScale = function(matrix) {\n\n        let a; let b; let c; let d\n        if (matrix) {\n            a = V.isUndefined(matrix.a) ? 1 : matrix.a\n            d = V.isUndefined(matrix.d) ? 1 : matrix.d\n            b = matrix.b\n            c = matrix.c\n        } else {\n            a = d = 1\n        }\n        return {\n            sx: b ? sqrt(a * a + b * b) : a,\n            sy: c ? sqrt(c * c + d * d) : d\n        }\n    },\n\n    // Return the `rotate` transformation from the following equation:\n    // `translate(tx, ty) . rotate(angle) . scale(sx, sy) === matrix(a,b,c,d,e,f)`\n    V.matrixToRotate = function(matrix) {\n\n        let p = { x: 0, y: 1 }\n        if (matrix) {\n            p =  V.deltaTransformPoint(matrix, p)\n        }\n\n        return {\n            angle: g.normalizeAngle(g.toDeg(atan2(p.y, p.x)) - 90)\n        }\n    },\n\n    // Return the `translate` transformation from the following equation:\n    // `translate(tx, ty) . rotate(angle) . scale(sx, sy) === matrix(a,b,c,d,e,f)`\n    V.matrixToTranslate = function(matrix) {\n\n        return {\n            tx: (matrix && matrix.e) || 0,\n            ty: (matrix && matrix.f) || 0\n        }\n    },\n\n    V.isV = function(object) {\n\n        return object instanceof V\n    }\n\n    // For backwards compatibility:\n    V.isVElement = V.isV\n\n    const svgDocument = V('svg').node\n\n    V.createSVGMatrix = function(matrix) {\n\n        const svgMatrix = svgDocument.createSVGMatrix()\n        for (const component in matrix) {\n            svgMatrix[component] = matrix[component]\n        }\n\n        return svgMatrix\n    }\n\n    V.createSVGTransform = function(matrix) {\n\n        if (!V.isUndefined(matrix)) {\n\n            if (!(matrix instanceof SVGMatrix)) {\n                matrix = V.createSVGMatrix(matrix)\n            }\n\n            return svgDocument.createSVGTransformFromMatrix(matrix)\n        }\n\n        return svgDocument.createSVGTransform()\n    }\n\n    V.createSVGPoint = function(x, y) {\n\n        const p = svgDocument.createSVGPoint()\n        p.x = x\n        p.y = y\n        return p\n    }\n\n    V.transformRect = function(r, matrix) {\n\n        const p = svgDocument.createSVGPoint()\n\n        p.x = r.x\n        p.y = r.y\n        const corner1 = p.matrixTransform(matrix)\n\n        p.x = r.x + r.width\n        p.y = r.y\n        const corner2 = p.matrixTransform(matrix)\n\n        p.x = r.x + r.width\n        p.y = r.y + r.height\n        const corner3 = p.matrixTransform(matrix)\n\n        p.x = r.x\n        p.y = r.y + r.height\n        const corner4 = p.matrixTransform(matrix)\n\n        const minX = min(corner1.x, corner2.x, corner3.x, corner4.x)\n        const maxX = max(corner1.x, corner2.x, corner3.x, corner4.x)\n        const minY = min(corner1.y, corner2.y, corner3.y, corner4.y)\n        const maxY = max(corner1.y, corner2.y, corner3.y, corner4.y)\n\n        return new g.Rect(minX, minY, maxX - minX, maxY - minY)\n    }\n\n    V.transformPoint = function(p, matrix) {\n\n        return new g.Point(V.createSVGPoint(p.x, p.y).matrixTransform(matrix))\n    }\n\n    V.transformLine = function(l, matrix) {\n\n        return new g.Line(\n            V.transformPoint(l.start, matrix),\n            V.transformPoint(l.end, matrix)\n        )\n    }\n\n    V.transformPolyline = function(p, matrix) {\n\n        let inPoints = (p instanceof g.Polyline) ? p.points : p\n        if (!V.isArray(inPoints)) inPoints = []\n        const outPoints = []\n        for (let i = 0, n = inPoints.length; i < n; i++) outPoints[i] = V.transformPoint(inPoints[i], matrix)\n        return new g.Polyline(outPoints)\n    },\n\n    // Convert a style represented as string (e.g. `'fill=\"blue\"; stroke=\"red\"'`) to\n    // an object (`{ fill: 'blue', stroke: 'red' }`).\n    V.styleToObject = function(styleString) {\n        const ret = {}\n        const styles = styleString.split(';')\n        for (let i = 0; i < styles.length; i++) {\n            const style = styles[i]\n            const pair = style.split('=')\n            ret[pair[0].trim()] = pair[1].trim()\n        }\n        return ret\n    }\n\n    // Inspired by d3.js https://github.com/mbostock/d3/blob/master/src/svg/arc.js\n    V.createSlicePathData = function(innerRadius, outerRadius, startAngle, endAngle) {\n\n        const svgArcMax = 2 * PI - 1e-6\n        const r0 = innerRadius\n        const r1 = outerRadius\n        let a0 = startAngle\n        let a1 = endAngle\n        var da = (a1 < a0 && (da = a0, a0 = a1, a1 = da), a1 - a0)\n        const df = da < PI ? '0' : '1'\n        const c0 = cos(a0)\n        const s0 = sin(a0)\n        const c1 = cos(a1)\n        const s1 = sin(a1)\n\n        return (da >= svgArcMax)\n            ? (r0\n                ? `M0,${  r1\n                 }A${  r1  },${  r1  } 0 1,1 0,${  -r1\n                 }A${  r1  },${  r1  } 0 1,1 0,${  r1\n                 }M0,${  r0\n                 }A${  r0  },${  r0  } 0 1,0 0,${  -r0\n                 }A${  r0  },${  r0  } 0 1,0 0,${  r0\n                 }Z`\n                : `M0,${  r1\n                 }A${  r1  },${  r1  } 0 1,1 0,${  -r1\n                 }A${  r1  },${  r1  } 0 1,1 0,${  r1\n                 }Z`)\n            : (r0\n                ? `M${  r1 * c0  },${  r1 * s0\n                 }A${  r1  },${  r1  } 0 ${  df  },1 ${  r1 * c1  },${  r1 * s1\n                 }L${  r0 * c1  },${  r0 * s1\n                 }A${  r0  },${  r0  } 0 ${  df  },0 ${  r0 * c0  },${  r0 * s0\n                 }Z`\n                : `M${  r1 * c0  },${  r1 * s0\n                 }A${  r1  },${  r1  } 0 ${  df  },1 ${  r1 * c1  },${  r1 * s1\n                 }L0,0`\n                + `Z`)\n    }\n\n    // Merge attributes from object `b` with attributes in object `a`.\n    // Note that this modifies the object `a`.\n    // Also important to note that attributes are merged but CSS classes are concatenated.\n    V.mergeAttrs = function(a, b) {\n\n        for (const attr in b) {\n\n            if (attr === 'class') {\n                // Concatenate classes.\n                a[attr] = a[attr] ? `${a[attr]  } ${  b[attr]}` : b[attr]\n            } else if (attr === 'style') {\n                // `style` attribute can be an object.\n                if (V.isObject(a[attr]) && V.isObject(b[attr])) {\n                    // `style` stored in `a` is an object.\n                    a[attr] = V.mergeAttrs(a[attr], b[attr])\n                } else if (V.isObject(a[attr])) {\n                    // `style` in `a` is an object but it's a string in `b`.\n                    // Convert the style represented as a string to an object in `b`.\n                    a[attr] = V.mergeAttrs(a[attr], V.styleToObject(b[attr]))\n                } else if (V.isObject(b[attr])) {\n                    // `style` in `a` is a string, in `b` it's an object.\n                    a[attr] = V.mergeAttrs(V.styleToObject(a[attr]), b[attr])\n                } else {\n                    // Both styles are strings.\n                    a[attr] = V.mergeAttrs(V.styleToObject(a[attr]), V.styleToObject(b[attr]))\n                }\n            } else {\n                a[attr] = b[attr]\n            }\n        }\n\n        return a\n    }\n\n    V.annotateString = function(t, annotations, opt) {\n\n        annotations = annotations || []\n        opt = opt || {}\n\n        const offset = opt.offset || 0\n        const compacted = []\n        let batch\n        const ret = []\n        let item\n        let prev\n\n        for (let i = 0; i < t.length; i++) {\n\n            item = ret[i] = t[i]\n\n            for (let j = 0; j < annotations.length; j++) {\n\n                const annotation = annotations[j]\n                const start = annotation.start + offset\n                const end = annotation.end + offset\n\n                if (i >= start && i < end) {\n                    // Annotation applies.\n                    if (V.isObject(item)) {\n                        // There is more than one annotation to be applied => Merge attributes.\n                        item.attrs = V.mergeAttrs(V.mergeAttrs({}, item.attrs), annotation.attrs)\n                    } else {\n                        item = ret[i] = { t: t[i], attrs: annotation.attrs }\n                    }\n                    if (opt.includeAnnotationIndices) {\n                        (item.annotations || (item.annotations = [])).push(j)\n                    }\n                }\n            }\n\n            prev = ret[i - 1]\n\n            if (!prev) {\n\n                batch = item\n\n            } else if (V.isObject(item) && V.isObject(prev)) {\n                // Both previous item and the current one are annotations. If the attributes\n                // didn't change, merge the text.\n                if (JSON.stringify(item.attrs) === JSON.stringify(prev.attrs)) {\n                    batch.t += item.t\n                } else {\n                    compacted.push(batch)\n                    batch = item\n                }\n\n            } else if (V.isObject(item)) {\n                // Previous item was a string, current item is an annotation.\n                compacted.push(batch)\n                batch = item\n\n            } else if (V.isObject(prev)) {\n                // Previous item was an annotation, current item is a string.\n                compacted.push(batch)\n                batch = item\n\n            } else {\n                // Both previous and current item are strings.\n                batch = (batch || '') + item\n            }\n        }\n\n        if (batch) {\n            compacted.push(batch)\n        }\n\n        return compacted\n    }\n\n    V.findAnnotationsAtIndex = function(annotations, index) {\n\n        const found = []\n\n        if (annotations) {\n\n            annotations.forEach(function(annotation) {\n\n                if (annotation.start < index && index <= annotation.end) {\n                    found.push(annotation)\n                }\n            })\n        }\n\n        return found\n    }\n\n    V.findAnnotationsBetweenIndexes = function(annotations, start, end) {\n\n        const found = []\n\n        if (annotations) {\n\n            annotations.forEach(function(annotation) {\n\n                if ((start >= annotation.start && start < annotation.end) || (end > annotation.start && end <= annotation.end) || (annotation.start >= start && annotation.end < end)) {\n                    found.push(annotation)\n                }\n            })\n        }\n\n        return found\n    }\n\n    // Shift all the text annotations after character `index` by `offset` positions.\n    V.shiftAnnotations = function(annotations, index, offset) {\n\n        if (annotations) {\n\n            annotations.forEach(function(annotation) {\n\n                if (annotation.start < index && annotation.end >= index) {\n                    annotation.end += offset\n                } else if (annotation.start >= index) {\n                    annotation.start += offset\n                    annotation.end += offset\n                }\n            })\n        }\n\n        return annotations\n    }\n\n    V.convertLineToPathData = function(line) {\n\n        line = V(line)\n        const d = [\n            'M', line.attr('x1'), line.attr('y1'),\n            'L', line.attr('x2'), line.attr('y2')\n        ].join(' ')\n        return d\n    }\n\n    V.convertPolygonToPathData = function(polygon) {\n\n        const points = V.getPointsFromSvgNode(polygon)\n        if (points.length === 0) return null\n\n        return `${V.svgPointsToPath(points)  } Z`\n    }\n\n    V.convertPolylineToPathData = function(polyline) {\n\n        const points = V.getPointsFromSvgNode(polyline)\n        if (points.length === 0) return null\n\n        return V.svgPointsToPath(points)\n    }\n\n    V.svgPointsToPath = function(points) {\n\n        for (let i = 0, n = points.length; i < n; i++) {\n            points[i] = `${points[i].x  } ${  points[i].y}`\n        }\n\n        return `M ${  points.join(' L')}`\n    }\n\n    V.getPointsFromSvgNode = function(node) {\n\n        node = V.toNode(node)\n        const points = []\n        const nodePoints = node.points\n        if (nodePoints) {\n            for (let i = 0, n = nodePoints.numberOfItems; i < n; i++) {\n                points.push(nodePoints.getItem(i))\n            }\n        }\n\n        return points\n    }\n\n    V.KAPPA = 0.551784\n\n    V.convertCircleToPathData = function(circle) {\n\n        circle = V(circle)\n        const cx = parseFloat(circle.attr('cx')) || 0\n        const cy = parseFloat(circle.attr('cy')) || 0\n        const r = parseFloat(circle.attr('r'))\n        const cd = r * V.KAPPA // Control distance.\n\n        const d = [\n            'M', cx, cy - r,    // Move to the first point.\n            'C', cx + cd, cy - r, cx + r, cy - cd, cx + r, cy, // I. Quadrant.\n            'C', cx + r, cy + cd, cx + cd, cy + r, cx, cy + r, // II. Quadrant.\n            'C', cx - cd, cy + r, cx - r, cy + cd, cx - r, cy, // III. Quadrant.\n            'C', cx - r, cy - cd, cx - cd, cy - r, cx, cy - r, // IV. Quadrant.\n            'Z'\n        ].join(' ')\n        return d\n    }\n\n    V.convertEllipseToPathData = function(ellipse) {\n\n        ellipse = V(ellipse)\n        const cx = parseFloat(ellipse.attr('cx')) || 0\n        const cy = parseFloat(ellipse.attr('cy')) || 0\n        const rx = parseFloat(ellipse.attr('rx'))\n        const ry = parseFloat(ellipse.attr('ry')) || rx\n        const cdx = rx * V.KAPPA // Control distance x.\n        const cdy = ry * V.KAPPA // Control distance y.\n\n        const d = [\n            'M', cx, cy - ry,    // Move to the first point.\n            'C', cx + cdx, cy - ry, cx + rx, cy - cdy, cx + rx, cy, // I. Quadrant.\n            'C', cx + rx, cy + cdy, cx + cdx, cy + ry, cx, cy + ry, // II. Quadrant.\n            'C', cx - cdx, cy + ry, cx - rx, cy + cdy, cx - rx, cy, // III. Quadrant.\n            'C', cx - rx, cy - cdy, cx - cdx, cy - ry, cx, cy - ry, // IV. Quadrant.\n            'Z'\n        ].join(' ')\n        return d\n    }\n\n    V.convertRectToPathData = function(rect) {\n\n        rect = V(rect)\n\n        return V.rectToPath({\n            x: parseFloat(rect.attr('x')) || 0,\n            y: parseFloat(rect.attr('y')) || 0,\n            width: parseFloat(rect.attr('width')) || 0,\n            height: parseFloat(rect.attr('height')) || 0,\n            rx: parseFloat(rect.attr('rx')) || 0,\n            ry: parseFloat(rect.attr('ry')) || 0\n        })\n    }\n\n    // Convert a rectangle to SVG path commands. `r` is an object of the form:\n    // `{ x: [number], y: [number], width: [number], height: [number], top-ry: [number], top-ry: [number], bottom-rx: [number], bottom-ry: [number] }`,\n    // where `x, y, width, height` are the usual rectangle attributes and [top-/bottom-]rx/ry allows for\n    // specifying radius of the rectangle for all its sides (as opposed to the built-in SVG rectangle\n    // that has only `rx` and `ry` attributes).\n    V.rectToPath = function(r) {\n\n        let d\n        const {x} = r\n        const {y} = r\n        const {width} = r\n        const {height} = r\n        const topRx = min(r.rx || r['top-rx'] || 0, width / 2)\n        const bottomRx = min(r.rx || r['bottom-rx'] || 0, width / 2)\n        const topRy = min(r.ry || r['top-ry'] || 0, height / 2)\n        const bottomRy = min(r.ry || r['bottom-ry'] || 0, height / 2)\n\n        if (topRx || bottomRx || topRy || bottomRy) {\n            d = [\n                'M', x, y + topRy,\n                'v', height - topRy - bottomRy,\n                'a', bottomRx, bottomRy, 0, 0, 0, bottomRx, bottomRy,\n                'h', width - 2 * bottomRx,\n                'a', bottomRx, bottomRy, 0, 0, 0, bottomRx, -bottomRy,\n                'v', -(height - bottomRy - topRy),\n                'a', topRx, topRy, 0, 0, 0, -topRx, -topRy,\n                'h', -(width - 2 * topRx),\n                'a', topRx, topRy, 0, 0, 0, -topRx, topRy,\n                'Z'\n            ]\n        } else {\n            d = [\n                'M', x, y,\n                'H', x + width,\n                'V', y + height,\n                'H', x,\n                'V', y,\n                'Z'\n            ]\n        }\n\n        return d.join(' ')\n    }\n\n    // Take a path data string\n    // Return a normalized path data string\n    // If data cannot be parsed, return 'M 0 0'\n    // Adapted from Rappid normalizePath polyfill\n    // Highly inspired by Raphael Library (www.raphael.com)\n    V.normalizePathData = (function() {\n\n        const spaces = '\\x09\\x0a\\x0b\\x0c\\x0d\\x20\\xa0\\u1680\\u180e\\u2000\\u2001\\u2002\\u2003\\u2004\\u2005\\u2006\\u2007\\u2008\\u2009\\u200a\\u202f\\u205f\\u3000\\u2028\\u2029'\n        const pathCommand = new RegExp(`([a-z])[${  spaces  },]*((-?\\\\d*\\\\.?\\\\d*(?:e[\\\\-+]?\\\\d+)?[${  spaces  }]*,?[${  spaces  }]*)+)`, 'ig')\n        const pathValues = new RegExp(`(-?\\\\d*\\\\.?\\\\d*(?:e[\\\\-+]?\\\\d+)?)[${  spaces  }]*,?[${  spaces  }]*`, 'ig')\n\n        const math = Math\n        const {PI} = math\n        const {sin} = math\n        const {cos} = math\n        const {tan} = math\n        const {asin} = math\n        const {sqrt} = math\n        const {abs} = math\n\n        function q2c(x1, y1, ax, ay, x2, y2) {\n\n            const _13 = 1 / 3\n            const _23 = 2 / 3\n            return [(_13 * x1) + (_23 * ax), (_13 * y1) + (_23 * ay), (_13 * x2) + (_23 * ax), (_13 * y2) + (_23 * ay), x2, y2]\n        }\n\n        function a2c(x1, y1, rx, ry, angle, large_arc_flag, sweep_flag, x2, y2, recursive) {\n            // for more information of where this math came from visit:\n            // http://www.w3.org/TR/SVG11/implnote.html#ArcImplementationNotes\n\n            const _120 = (PI * 120) / 180\n            const rad = (PI / 180) * (+angle || 0)\n            let res = []\n            let xy\n\n            const rotate = function(x, y, rad) {\n\n                const X = (x * cos(rad)) - (y * sin(rad))\n                const Y = (x * sin(rad)) + (y * cos(rad))\n                return { x: X, y: Y }\n            }\n\n            if (!recursive) {\n                xy = rotate(x1, y1, -rad)\n                x1 = xy.x\n                y1 = xy.y\n\n                xy = rotate(x2, y2, -rad)\n                x2 = xy.x\n                y2 = xy.y\n\n                const x = (x1 - x2) / 2\n                const y = (y1 - y2) / 2\n                let h = ((x * x) / (rx * rx)) + ((y * y) / (ry * ry))\n\n                if (h > 1) {\n                    h = sqrt(h)\n                    rx = h * rx\n                    ry = h * ry\n                }\n\n                const rx2 = rx * rx\n                const ry2 = ry * ry\n\n                const k = ((large_arc_flag == sweep_flag) ? -1 : 1) * sqrt(abs(((rx2 * ry2) - (rx2 * y * y) - (ry2 * x * x)) / ((rx2 * y * y) + (ry2 * x * x))))\n\n                var cx = ((k * rx * y) / ry) + ((x1 + x2) / 2)\n                var cy = ((k * -ry * x) / rx) + ((y1 + y2) / 2)\n\n                var f1 = asin(((y1 - cy) / ry).toFixed(9))\n                var f2 = asin(((y2 - cy) / ry).toFixed(9))\n\n                f1 = ((x1 < cx) ? (PI - f1) : f1)\n                f2 = ((x2 < cx) ? (PI - f2) : f2)\n\n                if (f1 < 0) f1 = (PI * 2) + f1\n                if (f2 < 0) f2 = (PI * 2) + f2\n\n                if ((sweep_flag && f1) > f2) f1 -= (PI * 2)\n                if ((!sweep_flag && f2) > f1) f2 -= (PI * 2)\n\n            } else {\n                f1 = recursive[0]\n                f2 = recursive[1]\n                cx = recursive[2]\n                cy = recursive[3]\n            }\n\n            let df = f2 - f1\n\n            if (abs(df) > _120) {\n                const f2old = f2\n                const x2old = x2\n                const y2old = y2\n\n                f2 = f1 + (_120 * (((sweep_flag && f2) > f1) ? 1 : -1))\n                x2 = cx + (rx * cos(f2))\n                y2 = cy + (ry * sin(f2))\n\n                res = a2c(x2, y2, rx, ry, angle, 0, sweep_flag, x2old, y2old, [f2, f2old, cx, cy])\n            }\n\n            df = f2 - f1\n\n            const c1 = cos(f1)\n            const s1 = sin(f1)\n            const c2 = cos(f2)\n            const s2 = sin(f2)\n\n            const t = tan(df / 4)\n\n            const hx = (4 / 3) * (rx * t)\n            const hy = (4 / 3) * (ry * t)\n\n            const m1 = [x1, y1]\n            const m2 = [x1 + (hx * s1), y1 - (hy * c1)]\n            const m3 = [x2 + (hx * s2), y2 - (hy * c2)]\n            const m4 = [x2, y2]\n\n            m2[0] = (2 * m1[0]) - m2[0]\n            m2[1] = (2 * m1[1]) - m2[1]\n\n            if (recursive) {\n                return [m2, m3, m4].concat(res)\n\n            } else {\n                res = [m2, m3, m4].concat(res).join().split(',')\n\n                const newres = []\n                const ii = res.length\n                for (let i = 0; i < ii; i++) {\n                    newres[i] = (i % 2) ? rotate(res[i - 1], res[i], rad).y : rotate(res[i], res[i + 1], rad).x\n                }\n\n                return newres\n            }\n        }\n\n        function parsePathString(pathString) {\n\n            if (!pathString) return null\n\n            const paramCounts = { a: 7, c: 6, h: 1, l: 2, m: 2, q: 4, s: 4, t: 2, v: 1, z: 0 }\n            const data = []\n\n            String(pathString).replace(pathCommand, function(a, b, c) {\n\n                const params = []\n                let name = b.toLowerCase()\n                c.replace(pathValues, function(a, b) {\n                    if (b) params.push(+b)\n                })\n\n                if ((name === 'm') && (params.length > 2)) {\n                    data.push([b].concat(params.splice(0, 2)))\n                    name = 'l'\n                    b = ((b === 'm') ? 'l' : 'L')\n                }\n\n                while (params.length >= paramCounts[name]) {\n                    data.push([b].concat(params.splice(0, paramCounts[name])))\n                    if (!paramCounts[name]) break\n                }\n            })\n\n            return data\n        }\n\n        function pathToAbsolute(pathArray) {\n\n            if (!Array.isArray(pathArray) || !Array.isArray(pathArray && pathArray[0])) { // rough assumption\n                pathArray = parsePathString(pathArray)\n            }\n\n            // if invalid string, return 'M 0 0'\n            if (!pathArray || !pathArray.length) return [['M', 0, 0]]\n\n            const res = []\n            let x = 0\n            let y = 0\n            let mx = 0\n            let my = 0\n            const start = 0\n            let pa0\n\n            const ii = pathArray.length\n            for (let i = start; i < ii; i++) {\n\n                const r = []\n                res.push(r)\n\n                const pa = pathArray[i]\n                pa0 = pa[0]\n\n                if (pa0 != pa0.toUpperCase()) {\n                    r[0] = pa0.toUpperCase()\n\n                    var jj\n                    var j\n                    switch (r[0]) {\n                        case 'A':\n                            r[1] = pa[1]\n                            r[2] = pa[2]\n                            r[3] = pa[3]\n                            r[4] = pa[4]\n                            r[5] = pa[5]\n                            r[6] = +pa[6] + x\n                            r[7] = +pa[7] + y\n                            break\n\n                        case 'V':\n                            r[1] = +pa[1] + y\n                            break\n\n                        case 'H':\n                            r[1] = +pa[1] + x\n                            break\n\n                        case 'M':\n                            mx = +pa[1] + x\n                            my = +pa[2] + y\n\n                            jj = pa.length\n                            for (j = 1; j < jj; j++) {\n                                r[j] = +pa[j] + ((j % 2) ? x : y)\n                            }\n                            break\n\n                        default:\n                            jj = pa.length\n                            for (j = 1; j < jj; j++) {\n                                r[j] = +pa[j] + ((j % 2) ? x : y)\n                            }\n                            break\n                    }\n                } else {\n                    const kk = pa.length\n                    for (let k = 0; k < kk; k++) {\n                        r[k] = pa[k]\n                    }\n                }\n\n                switch (r[0]) {\n                    case 'Z':\n                        x = +mx\n                        y = +my\n                        break\n\n                    case 'H':\n                        x = r[1]\n                        break\n\n                    case 'V':\n                        y = r[1]\n                        break\n\n                    case 'M':\n                        mx = r[r.length - 2]\n                        my = r[r.length - 1]\n                        x = r[r.length - 2]\n                        y = r[r.length - 1]\n                        break\n\n                    default:\n                        x = r[r.length - 2]\n                        y = r[r.length - 1]\n                        break\n                }\n            }\n\n            return res\n        }\n\n        function normalize(path) {\n\n            const p = pathToAbsolute(path)\n            const attrs = { x: 0, y: 0, bx: 0, by: 0, X: 0, Y: 0, qx: null, qy: null }\n\n            function processPath(path, d, pcom) {\n\n                let nx; let ny\n\n                if (!path) return ['C', d.x, d.y, d.x, d.y, d.x, d.y]\n\n                if (!(path[0] in { T: 1, Q: 1 })) {\n                    d.qx = null\n                    d.qy = null\n                }\n\n                switch (path[0]) {\n                    case 'M':\n                        d.X = path[1]\n                        d.Y = path[2]\n                        break\n\n                    case 'A':\n                        path = ['C'].concat(a2c.apply(0, [d.x, d.y].concat(path.slice(1))))\n                        break\n\n                    case 'S':\n                        if (pcom === 'C' || pcom === 'S') { // In 'S' case we have to take into account, if the previous command is C/S.\n                            nx = (d.x * 2) - d.bx          // And reflect the previous\n                            ny = (d.y * 2) - d.by          // command's control point relative to the current point.\n                        }\n                        else {                            // or some else or nothing\n                            nx = d.x\n                            ny = d.y\n                        }\n                        path = ['C', nx, ny].concat(path.slice(1))\n                        break\n\n                    case 'T':\n                        if (pcom === 'Q' || pcom === 'T') { // In 'T' case we have to take into account, if the previous command is Q/T.\n                            d.qx = (d.x * 2) - d.qx        // And make a reflection similar\n                            d.qy = (d.y * 2) - d.qy        // to case 'S'.\n                        }\n                        else {                            // or something else or nothing\n                            d.qx = d.x\n                            d.qy = d.y\n                        }\n                        path = ['C'].concat(q2c(d.x, d.y, d.qx, d.qy, path[1], path[2]))\n                        break\n\n                    case 'Q':\n                        d.qx = path[1]\n                        d.qy = path[2]\n                        path = ['C'].concat(q2c(d.x, d.y, path[1], path[2], path[3], path[4]))\n                        break\n\n                    case 'H':\n                        path = ['L'].concat(path[1], d.y)\n                        break\n\n                    case 'V':\n                        path = ['L'].concat(d.x, path[1])\n                        break\n\n                    // leave 'L' & 'Z' commands as they were:\n\n                    case 'L':\n                        break\n\n                    case 'Z':\n                        break\n                }\n\n                return path\n            }\n\n            function fixArc(pp, i) {\n\n                if (pp[i].length > 7) {\n\n                    pp[i].shift()\n                    const pi = pp[i]\n\n                    while (pi.length) {\n                        pcoms[i] = 'A' // if created multiple 'C's, their original seg is saved\n                        pp.splice(i++, 0, ['C'].concat(pi.splice(0, 6)))\n                    }\n\n                    pp.splice(i, 1)\n                    ii = p.length\n                }\n            }\n\n            var pcoms = [] // path commands of original path p\n            let pfirst = '' // temporary holder for original path command\n            let pcom = '' // holder for previous path command of original path\n\n            var ii = p.length\n            for (let i = 0; i < ii; i++) {\n                if (p[i]) pfirst = p[i][0] // save current path command\n\n                if (pfirst !== 'C') { // C is not saved yet, because it may be result of conversion\n                    pcoms[i] = pfirst // Save current path command\n                    if (i > 0) pcom = pcoms[i - 1] // Get previous path command pcom\n                }\n\n                p[i] = processPath(p[i], attrs, pcom) // Previous path command is inputted to processPath\n\n                if (pcoms[i] !== 'A' && pfirst === 'C') pcoms[i] = 'C' // 'A' is the only command\n                // which may produce multiple 'C's\n                // so we have to make sure that 'C' is also 'C' in original path\n\n                fixArc(p, i) // fixArc adds also the right amount of 'A's to pcoms\n\n                const seg = p[i]\n                const seglen = seg.length\n\n                attrs.x = seg[seglen - 2]\n                attrs.y = seg[seglen - 1]\n\n                attrs.bx = parseFloat(seg[seglen - 4]) || attrs.x\n                attrs.by = parseFloat(seg[seglen - 3]) || attrs.y\n            }\n\n            // make sure normalized path data string starts with an M segment\n            if (!p[0][0] || p[0][0] !== 'M') {\n                p.unshift(['M', 0, 0])\n            }\n\n            return p\n        }\n\n        return function(pathData) {\n            return normalize(pathData).join(',').split(',').join(' ')\n        }\n    })()\n\n    V.namespace = ns\n\n    return V\n\n})()\n\n// Global namespace.\n\nvar joint = {\n\n    version: '2.1.4',\n\n    config: {\n        // The class name prefix config is for advanced use only.\n        // Be aware that if you change the prefix, the JointJS CSS will no longer function properly.\n        classNamePrefix: 'joint-',\n        defaultTheme: 'default'\n    },\n\n    // `joint.dia` namespace.\n    dia: {},\n\n    // `joint.ui` namespace.\n    ui: {},\n\n    // `joint.layout` namespace.\n    layout: {},\n\n    // `joint.shapes` namespace.\n    shapes: {},\n\n    // `joint.format` namespace.\n    format: {},\n\n    // `joint.connectors` namespace.\n    connectors: {},\n\n    // `joint.highlighters` namespace.\n    highlighters: {},\n\n    // `joint.routers` namespace.\n    routers: {},\n\n    // `joint.anchors` namespace.\n    anchors: {},\n\n    // `joint.connectionPoints` namespace.\n    connectionPoints: {},\n\n    // `joint.connectionStrategies` namespace.\n    connectionStrategies: {},\n\n    // `joint.linkTools` namespace.\n    linkTools: {},\n\n    // `joint.mvc` namespace.\n    mvc: {\n        views: {}\n    },\n\n    setTheme: function(theme, opt) {\n\n        opt = opt || {}\n\n        joint.util.invoke(joint.mvc.views, 'setTheme', theme, opt)\n\n        // Update the default theme on the view prototype.\n        joint.mvc.View.prototype.defaultTheme = theme\n    },\n\n    // `joint.env` namespace.\n    env: {\n\n        _results: {},\n\n        _tests: {\n\n            svgforeignobject: function() {\n                return !!document.createElementNS &&\n              /SVGForeignObject/.test(({}).toString.call(document.createElementNS('http://www.w3.org/2000/svg', 'foreignObject')))\n            }\n        },\n\n        addTest: function(name, fn) {\n\n            return joint.env._tests[name] = fn\n        },\n\n        test: function(name) {\n\n            const fn = joint.env._tests[name]\n\n            if (!fn) {\n                throw new Error(`Test not defined (\"${  name  }\"). Use \\`joint.env.addTest(name, fn) to add a new test.\\``)\n            }\n\n            let result = joint.env._results[name]\n\n            if (typeof result !== 'undefined') {\n                return result\n            }\n\n            try {\n                result = fn()\n            } catch (error) {\n                result = false\n            }\n\n            // Cache the test result.\n            joint.env._results[name] = result\n\n            return result\n        }\n    },\n\n    util: {\n\n        // Return a simple hash code from a string. See http://werxltd.com/wp/2010/05/13/javascript-implementation-of-javas-string-hashcode-method/.\n        hashCode: function(str) {\n\n            let hash = 0\n            if (str.length == 0) return hash\n            for (let i = 0; i < str.length; i++) {\n                const c = str.charCodeAt(i)\n                hash = ((hash << 5) - hash) + c\n                hash &= hash // Convert to 32bit integer\n            }\n            return hash\n        },\n\n        getByPath: function(obj, path, delim) {\n\n            const keys = Array.isArray(path) ? path.slice() : path.split(delim || '/')\n            let key\n\n            while (keys.length) {\n                key = keys.shift()\n                if (Object(obj) === obj && key in obj) {\n                    obj = obj[key]\n                } else {\n                    return undefined\n                }\n            }\n            return obj\n        },\n\n        setByPath: function(obj, path, value, delim) {\n\n            const keys = Array.isArray(path) ? path : path.split(delim || '/')\n\n            let diver = obj\n            let i = 0\n\n            for (var len = keys.length; i < len - 1; i++) {\n                // diver creates an empty object if there is no nested object under such a key.\n                // This means that one can populate an empty nested object with setByPath().\n                diver = diver[keys[i]] || (diver[keys[i]] = {})\n            }\n            diver[keys[len - 1]] = value\n\n            return obj\n        },\n\n        unsetByPath: function(obj, path, delim) {\n\n            delim = delim || '/'\n\n            const pathArray = Array.isArray(path) ? path.slice() : path.split(delim)\n\n            const propertyToRemove = pathArray.pop()\n            if (pathArray.length > 0) {\n\n                // unsetting a nested attribute\n                const parent = joint.util.getByPath(obj, pathArray, delim)\n\n                if (parent) {\n                    delete parent[propertyToRemove]\n                }\n\n            } else {\n\n                // unsetting a primitive attribute\n                delete obj[propertyToRemove]\n            }\n\n            return obj\n        },\n\n        flattenObject: function(obj, delim, stop) {\n\n            delim = delim || '/'\n            const ret = {}\n\n            for (const key in obj) {\n\n                if (!obj.hasOwnProperty(key)) continue\n\n                let shouldGoDeeper = typeof obj[key] === 'object'\n                if (shouldGoDeeper && stop && stop(obj[key])) {\n                    shouldGoDeeper = false\n                }\n\n                if (shouldGoDeeper) {\n\n                    const flatObject = this.flattenObject(obj[key], delim, stop)\n\n                    for (const flatKey in flatObject) {\n                        if (!flatObject.hasOwnProperty(flatKey)) continue\n                        ret[key + delim + flatKey] = flatObject[flatKey]\n                    }\n\n                } else {\n\n                    ret[key] = obj[key]\n                }\n            }\n\n            return ret\n        },\n\n        uuid: function() {\n\n            // credit: http://stackoverflow.com/posts/2117523/revisions\n\n            return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {\n                const r = Math.random() * 16|0\n                const v = c == 'x' ? r : (r&0x3|0x8)\n                return v.toString(16)\n            })\n        },\n\n        // Generate global unique id for obj and store it as a property of the object.\n        guid: function(obj) {\n\n            this.guid.id = this.guid.id || 1\n            obj.id = (obj.id === undefined ? `j_${  this.guid.id++}` : obj.id)\n            return obj.id\n        },\n\n        toKebabCase: function(string) {\n\n            return string.replace(/[A-Z]/g, '-$&').toLowerCase()\n        },\n\n        normalizeEvent: function(evt) {\n\n            const touchEvt = evt.originalEvent && evt.originalEvent.changedTouches && evt.originalEvent.changedTouches[0]\n            if (touchEvt) {\n                for (const property in evt) {\n                    // copy all the properties from the input event that are not\n                    // defined on the touch event (functions included).\n                    if (touchEvt[property] === undefined) {\n                        touchEvt[property] = evt[property]\n                    }\n                }\n                return touchEvt\n            }\n\n            return evt\n        },\n\n        nextFrame: (function() {\n\n            let raf\n\n            if (typeof window !== 'undefined') {\n\n                raf = window.requestAnimationFrame ||\n                        window.webkitRequestAnimationFrame ||\n                        window.mozRequestAnimationFrame ||\n                        window.oRequestAnimationFrame ||\n                        window.msRequestAnimationFrame\n            }\n\n            if (!raf) {\n\n                let lastTime = 0\n\n                raf = function(callback) {\n\n                    const currTime = new Date().getTime()\n                    const timeToCall = Math.max(0, 16 - (currTime - lastTime))\n                    const id = setTimeout(function() { callback(currTime + timeToCall) }, timeToCall)\n\n                    lastTime = currTime + timeToCall\n\n                    return id\n                }\n            }\n\n            return function(callback, context) {\n                return context\n                    ? raf(callback.bind(context))\n                    : raf(callback)\n            }\n\n        })(),\n\n        cancelFrame: (function() {\n\n            let caf\n            const client = typeof window !== 'undefined'\n\n            if (client) {\n\n                caf = window.cancelAnimationFrame ||\n                        window.webkitCancelAnimationFrame ||\n                        window.webkitCancelRequestAnimationFrame ||\n                        window.msCancelAnimationFrame ||\n                        window.msCancelRequestAnimationFrame ||\n                        window.oCancelAnimationFrame ||\n                        window.oCancelRequestAnimationFrame ||\n                        window.mozCancelAnimationFrame ||\n                        window.mozCancelRequestAnimationFrame\n            }\n\n            caf = caf || clearTimeout\n\n            return client ? caf.bind(window) : caf\n\n        })(),\n\n        // ** Deprecated **\n        shapePerimeterConnectionPoint: function(linkView, view, magnet, reference) {\n\n            let bbox\n            let spot\n\n            if (!magnet) {\n\n                // There is no magnet, try to make the best guess what is the\n                // wrapping SVG element. This is because we want this \"smart\"\n                // connection points to work out of the box without the\n                // programmer to put magnet marks to any of the subelements.\n                // For example, we want the functoin to work on basic.Path elements\n                // without any special treatment of such elements.\n                // The code below guesses the wrapping element based on\n                // one simple assumption. The wrapping elemnet is the\n                // first child of the scalable group if such a group exists\n                // or the first child of the rotatable group if not.\n                // This makese sense because usually the wrapping element\n                // is below any other sub element in the shapes.\n                const scalable = view.$('.scalable')[0]\n                const rotatable = view.$('.rotatable')[0]\n\n                if (scalable && scalable.firstChild) {\n\n                    magnet = scalable.firstChild\n\n                } else if (rotatable && rotatable.firstChild) {\n\n                    magnet = rotatable.firstChild\n                }\n            }\n\n            if (magnet) {\n\n                spot = V(magnet).findIntersection(reference, linkView.paper.viewport)\n                if (!spot) {\n                    bbox = V(magnet).getBBox({ target: linkView.paper.viewport })\n                }\n\n            } else {\n\n                bbox = view.model.getBBox()\n                spot = bbox.intersectionWithLineFromCenterToPoint(reference)\n            }\n            return spot || bbox.center()\n        },\n\n        isPercentage: function(val) {\n\n            return joint.util.isString(val) && val.slice(-1) === '%'\n        },\n\n        parseCssNumeric: function(strValue, restrictUnits) {\n\n            restrictUnits = restrictUnits || []\n            const cssNumeric = { value: parseFloat(strValue) }\n\n            if (Number.isNaN(cssNumeric.value)) {\n                return null\n            }\n\n            const validUnitsExp = restrictUnits.join('|')\n\n            if (joint.util.isString(strValue)) {\n                const matches = new RegExp(`(\\\\d+)(${  validUnitsExp  })$`).exec(strValue)\n                if (!matches) {\n                    return null\n                }\n                if (matches[2]) {\n                    cssNumeric.unit = matches[2]\n                }\n            }\n            return cssNumeric\n        },\n\n        breakText: function(text, size, styles, opt) {\n\n            opt = opt || {}\n            styles = styles || {}\n\n            const {width} = size\n            const {height} = size\n\n            const svgDocument = opt.svgDocument || V('svg').node\n            const textSpan = V('tspan').node\n            const textElement = V('text').attr(styles).append(textSpan).node\n            const textNode = document.createTextNode('')\n\n            // Prevent flickering\n            textElement.style.opacity = 0\n            // Prevent FF from throwing an uncaught exception when `getBBox()`\n            // called on element that is not in the render tree (is not measurable).\n            // <tspan>.getComputedTextLength() returns always 0 in this case.\n            // Note that the `textElement` resp. `textSpan` can become hidden\n            // when it's appended to the DOM and a `display: none` CSS stylesheet\n            // rule gets applied.\n            textElement.style.display = 'block'\n            textSpan.style.display = 'block'\n\n            textSpan.appendChild(textNode)\n            svgDocument.appendChild(textElement)\n\n            if (!opt.svgDocument) {\n\n                document.body.appendChild(svgDocument)\n            }\n\n            const separator = opt.separator || ' '\n            const eol = opt.eol || '\\n'\n\n            const words = text.split(separator)\n            const full = []\n            let lines = []\n            let p\n            let lineHeight\n\n            for (let i = 0, l = 0, len = words.length; i < len; i++) {\n\n                const word = words[i]\n\n                if (!word) continue\n\n                if (eol && word.indexOf(eol) >= 0) {\n                    // word cotains end-of-line character\n                    if (word.length > 1) {\n                        // separate word and continue cycle\n                        const eolWords = word.split(eol)\n                        for (let j = 0, jl = eolWords.length - 1; j < jl; j++) {\n                            eolWords.splice(2 * j + 1, 0, eol)\n                        }\n                        Array.prototype.splice.apply(words, [i, 1].concat(eolWords))\n                        i--\n                        len += eolWords.length - 1\n                    } else {\n                        // creates new line\n                        l++\n                    }\n                    continue\n                }\n\n\n                textNode.data = lines[l] ? `${lines[l]  } ${  word}` : word\n\n                if (textSpan.getComputedTextLength() <= width) {\n\n                    // the current line fits\n                    lines[l] = textNode.data\n\n                    if (p) {\n                        // We were partitioning. Put rest of the word onto next line\n                        full[l++] = true\n\n                        // cancel partitioning\n                        p = 0\n                    }\n\n                } else {\n\n                    if (!lines[l] || p) {\n\n                        const partition = !!p\n\n                        p = word.length - 1\n\n                        if (partition || !p) {\n\n                            // word has only one character.\n                            if (!p) {\n\n                                if (!lines[l]) {\n\n                                    // we won't fit this text within our rect\n                                    lines = []\n\n                                    break\n                                }\n\n                                // partitioning didn't help on the non-empty line\n                                // try again, but this time start with a new line\n\n                                // cancel partitions created\n                                words.splice(i, 2, word + words[i + 1])\n\n                                // adjust word length\n                                len--\n\n                                full[l++] = true\n                                i--\n\n                                continue\n                            }\n\n                            // move last letter to the beginning of the next word\n                            words[i] = word.substring(0, p)\n                            words[i + 1] = word.substring(p) + words[i + 1]\n\n                        } else {\n\n                            // We initiate partitioning\n                            // split the long word into two words\n                            words.splice(i, 1, word.substring(0, p), word.substring(p))\n\n                            // adjust words length\n                            len++\n\n                            if (l && !full[l - 1]) {\n                                // if the previous line is not full, try to fit max part of\n                                // the current word there\n                                l--\n                            }\n                        }\n\n                        i--\n\n                        continue\n                    }\n\n                    l++\n                    i--\n                }\n\n                // if size.height is defined we have to check whether the height of the entire\n                // text exceeds the rect height\n                if (height !== undefined) {\n\n                    if (lineHeight === undefined) {\n\n                        var heightValue\n\n                        // use the same defaults as in V.prototype.text\n                        if (styles.lineHeight === 'auto') {\n                            heightValue = { value: 1.5, unit: 'em' }\n                        } else {\n                            heightValue = joint.util.parseCssNumeric(styles.lineHeight, ['em']) || { value: 1, unit: 'em' }\n                        }\n\n                        lineHeight = heightValue.value\n                        if (heightValue.unit === 'em' ) {\n                            lineHeight *= textElement.getBBox().height\n                        }\n                    }\n\n                    if (lineHeight * lines.length > height) {\n\n                        // remove overflowing lines\n                        lines.splice(Math.floor(height / lineHeight))\n\n                        break\n                    }\n                }\n            }\n\n            if (opt.svgDocument) {\n\n                // svg document was provided, remove the text element only\n                svgDocument.removeChild(textElement)\n\n            } else {\n\n                // clean svg document\n                document.body.removeChild(svgDocument)\n            }\n\n            return lines.join(eol)\n        },\n\n        // Sanitize HTML\n        // Based on https://gist.github.com/ufologist/5a0da51b2b9ef1b861c30254172ac3c9\n        // Parses a string into an array of DOM nodes.\n        // Then outputs it back as a string.\n        sanitizeHTML: function(html) {\n\n            // Ignores tags that are invalid inside a <div> tag (e.g. <body>, <head>)\n\n            // If documentContext (second parameter) is not specified or given as `null` or `undefined`, a new document is used.\n            // Inline events will not execute when the HTML is parsed; this includes, for example, sending GET requests for images.\n\n            // If keepScripts (last parameter) is `false`, scripts are not executed.\n            const output = $($.parseHTML(`<div>${  html  }</div>`, null, false))\n\n            output.find('*').each(function() { // for all nodes\n                const currentNode = this\n\n                $.each(currentNode.attributes, function() { // for all attributes in each node\n                    const currentAttribute = this\n\n                    const attrName = currentAttribute.name\n                    const attrValue = currentAttribute.value\n\n                    // Remove attribute names that start with \"on\" (e.g. onload, onerror...).\n                    // Remove attribute values that start with \"javascript:\" pseudo protocol (e.g. `href=\"javascript:alert(1)\"`).\n                    if (attrName.indexOf('on') === 0 || attrValue.indexOf('javascript:') === 0) {\n                        $(currentNode).removeAttr(attrName)\n                    }\n                })\n            })\n\n            return output.html()\n        },\n\n        // Download `blob` as file with `fileName`.\n        // Does not work in IE9.\n        downloadBlob: function(blob, fileName) {\n\n            if (window.navigator.msSaveBlob) { // requires IE 10+\n                // pulls up a save dialog\n                window.navigator.msSaveBlob(blob, fileName)\n\n            } else { // other browsers\n                // downloads directly in Chrome and Safari\n\n                // presents a save/open dialog in Firefox\n                // Firefox bug: `from` field in save dialog always shows `from:blob:`\n                // https://bugzilla.mozilla.org/show_bug.cgi?id=1053327\n\n                const url = window.URL.createObjectURL(blob)\n                const link = document.createElement('a')\n\n                link.href = url\n                link.download = fileName\n                document.body.appendChild(link)\n\n                link.click()\n\n                document.body.removeChild(link)\n                window.URL.revokeObjectURL(url) // mark the url for garbage collection\n            }\n        },\n\n        // Download `dataUri` as file with `fileName`.\n        // Does not work in IE9.\n        downloadDataUri: function(dataUri, fileName) {\n\n            const blob = joint.util.dataUriToBlob(dataUri)\n            joint.util.downloadBlob(blob, fileName)\n        },\n\n        // Convert an uri-encoded data component (possibly also base64-encoded) to a blob.\n        dataUriToBlob: function(dataUri) {\n\n            // first, make sure there are no newlines in the data uri\n            dataUri = dataUri.replace(/\\s/g, '')\n            dataUri = decodeURIComponent(dataUri)\n\n            const firstCommaIndex = dataUri.indexOf(',') // split dataUri as `dataTypeString`,`data`\n\n            const dataTypeString = dataUri.slice(0, firstCommaIndex) // e.g. 'data:image/jpeg;base64'\n            const mimeString = dataTypeString.split(':')[1].split(';')[0] // e.g. 'image/jpeg'\n\n            const data = dataUri.slice(firstCommaIndex + 1)\n            let decodedString\n            if (dataTypeString.indexOf('base64') >= 0) { // data may be encoded in base64\n                decodedString = atob(data) // decode data\n            } else {\n                // convert the decoded string to UTF-8\n                decodedString = unescape(encodeURIComponent(data))\n            }\n            // write the bytes of the string to a typed array\n            const ia = new Uint8Array(decodedString.length)\n            for (let i = 0; i < decodedString.length; i++) {\n                ia[i] = decodedString.charCodeAt(i)\n            }\n\n            return new Blob([ia], { type: mimeString }) // return the typed array as Blob\n        },\n\n        // Read an image at `url` and return it as base64-encoded data uri.\n        // The mime type of the image is inferred from the `url` file extension.\n        // If data uri is provided as `url`, it is returned back unchanged.\n        // `callback` is a method with `err` as first argument and `dataUri` as second argument.\n        // Works with IE9.\n        imageToDataUri: function(url, callback) {\n\n            if (!url || url.substr(0, 'data:'.length) === 'data:') {\n                // No need to convert to data uri if it is already in data uri.\n\n                // This not only convenient but desired. For example,\n                // IE throws a security error if data:image/svg+xml is used to render\n                // an image to the canvas and an attempt is made to read out data uri.\n                // Now if our image is already in data uri, there is no need to render it to the canvas\n                // and so we can bypass this error.\n\n                // Keep the async nature of the function.\n                return setTimeout(function() {\n                    callback(null, url)\n                }, 0)\n            }\n\n            // chrome, IE10+\n            const modernHandler = function(xhr, callback) {\n\n                if (xhr.status === 200) {\n\n                    const reader = new FileReader()\n\n                    reader.onload = function(evt) {\n                        const dataUri = evt.target.result\n                        callback(null, dataUri)\n                    }\n\n                    reader.onerror = function() {\n                        callback(new Error(`Failed to load image ${  url}`))\n                    }\n\n                    reader.readAsDataURL(xhr.response)\n                } else {\n                    callback(new Error(`Failed to load image ${  url}`))\n                }\n            }\n\n            const legacyHandler = function(xhr, callback) {\n\n                const Uint8ToString = function(u8a) {\n                    const CHUNK_SZ = 0x8000\n                    const c = []\n                    for (let i = 0; i < u8a.length; i += CHUNK_SZ) {\n                        c.push(String.fromCharCode.apply(null, u8a.subarray(i, i + CHUNK_SZ)))\n                    }\n                    return c.join('')\n                }\n\n                if (xhr.status === 200) {\n\n                    const bytes = new Uint8Array(xhr.response)\n\n                    const suffix = (url.split('.').pop()) || 'png'\n                    const map = {\n                        svg: 'svg+xml'\n                    }\n                    const meta = `data:image/${  map[suffix] || suffix  };base64,`\n                    const b64encoded = meta + btoa(Uint8ToString(bytes))\n                    callback(null, b64encoded)\n                } else {\n                    callback(new Error(`Failed to load image ${  url}`))\n                }\n            }\n\n            const xhr = new XMLHttpRequest()\n\n            xhr.open('GET', url, true)\n            xhr.addEventListener('error', function() {\n                callback(new Error(`Failed to load image ${  url}`))\n            })\n\n            xhr.responseType = window.FileReader ? 'blob' : 'arraybuffer'\n\n            xhr.addEventListener('load', function() {\n                if (window.FileReader) {\n                    modernHandler(xhr, callback)\n                } else {\n                    legacyHandler(xhr, callback)\n                }\n            })\n\n            xhr.send()\n        },\n\n        getElementBBox: function(el) {\n\n            const $el = $(el)\n            if ($el.length === 0) {\n                throw new Error('Element not found')\n            }\n\n            const element = $el[0]\n            const doc = element.ownerDocument\n            const clientBBox = element.getBoundingClientRect()\n\n            let strokeWidthX = 0\n            let strokeWidthY = 0\n\n            // Firefox correction\n            if (element.ownerSVGElement) {\n\n                const vel = V(element)\n                const bbox = vel.getBBox({ target: vel.svg() })\n\n                // if FF getBoundingClientRect includes stroke-width, getBBox doesn't.\n                // To unify this across all browsers we need to adjust the final bBox with `stroke-width` value.\n                strokeWidthX = (clientBBox.width - bbox.width)\n                strokeWidthY = (clientBBox.height - bbox.height)\n            }\n\n            return  {\n                x: clientBBox.left + window.pageXOffset - doc.documentElement.offsetLeft + strokeWidthX / 2,\n                y: clientBBox.top + window.pageYOffset - doc.documentElement.offsetTop + strokeWidthY / 2,\n                width: clientBBox.width - strokeWidthX,\n                height: clientBBox.height - strokeWidthY\n            }\n        },\n\n\n        // Highly inspired by the jquery.sortElements plugin by Padolsey.\n        // See http://james.padolsey.com/javascript/sorting-elements-with-jquery/.\n        sortElements: function(elements, comparator) {\n\n            const $elements = $(elements)\n            const placements = $elements.map(function() {\n\n                const sortElement = this\n                const {parentNode} = sortElement\n                // Since the element itself will change position, we have\n                // to have some way of storing it's original position in\n                // the DOM. The easiest way is to have a 'flag' node:\n                const nextSibling = parentNode.insertBefore(document.createTextNode(''), sortElement.nextSibling)\n\n                return function() {\n\n                    if (parentNode === this) {\n                        throw new Error('You can\\'t sort elements if any one is a descendant of another.')\n                    }\n\n                    // Insert before flag:\n                    parentNode.insertBefore(this, nextSibling)\n                    // Remove flag:\n                    parentNode.removeChild(nextSibling)\n                }\n            })\n\n            return Array.prototype.sort.call($elements, comparator).each(function(i) {\n                placements[i].call(this)\n            })\n        },\n\n        // Sets attributes on the given element and its descendants based on the selector.\n        // `attrs` object: { [SELECTOR1]: { attrs1 }, [SELECTOR2]: { attrs2}, ... } e.g. { 'input': { color : 'red' }}\n        setAttributesBySelector: function(element, attrs) {\n\n            const $element = $(element)\n\n            joint.util.forIn(attrs, function(attrs, selector) {\n                const $elements = $element.find(selector).addBack().filter(selector)\n                // Make a special case for setting classes.\n                // We do not want to overwrite any existing class.\n                if (joint.util.has(attrs, 'class')) {\n                    $elements.addClass(attrs.class)\n                    attrs = joint.util.omit(attrs, 'class')\n                }\n                $elements.attr(attrs)\n            })\n        },\n\n        // Return a new object with all four sides (top, right, bottom, left) in it.\n        // Value of each side is taken from the given argument (either number or object).\n        // Default value for a side is 0.\n        // Examples:\n        // joint.util.normalizeSides(5) --> { top: 5, right: 5, bottom: 5, left: 5 }\n        // joint.util.normalizeSides({ horizontal: 5 }) --> { top: 0, right: 5, bottom: 0, left: 5 }\n        // joint.util.normalizeSides({ left: 5 }) --> { top: 0, right: 0, bottom: 0, left: 5 }\n        // joint.util.normalizeSides({ horizontal: 10, left: 5 }) --> { top: 0, right: 10, bottom: 0, left: 5 }\n        // joint.util.normalizeSides({ horizontal: 0, left: 5 }) --> { top: 0, right: 0, bottom: 0, left: 5 }\n        normalizeSides: function(box) {\n\n            if (Object(box) !== box) { // `box` is not an object\n                let val = 0 // `val` left as 0 if `box` cannot be understood as finite number\n                if (isFinite(box)) val = +box // actually also accepts string numbers (e.g. '100')\n\n                return { top: val, right: val, bottom: val, left: val }\n            }\n\n            // `box` is an object\n            let top; let right; let bottom; let left\n            top = right = bottom = left = 0\n\n            if (isFinite(box.vertical)) top = bottom = +box.vertical\n            if (isFinite(box.horizontal)) right = left = +box.horizontal\n\n            if (isFinite(box.top)) top = +box.top // overwrite vertical\n            if (isFinite(box.right)) right = +box.right // overwrite horizontal\n            if (isFinite(box.bottom)) bottom = +box.bottom // overwrite vertical\n            if (isFinite(box.left)) left = +box.left // overwrite horizontal\n\n            return { top: top, right: right, bottom: bottom, left: left }\n        },\n\n        timing: {\n\n            linear: function(t) {\n                return t\n            },\n\n            quad: function(t) {\n                return t * t\n            },\n\n            cubic: function(t) {\n                return t * t * t\n            },\n\n            inout: function(t) {\n                if (t <= 0) return 0\n                if (t >= 1) return 1\n                const t2 = t * t\n                const t3 = t2 * t\n                return 4 * (t < .5 ? t3 : 3 * (t - t2) + t3 - .75)\n            },\n\n            exponential: function(t) {\n                return Math.pow(2, 10 * (t - 1))\n            },\n\n            bounce: function(t) {\n                for (let a = 0, b = 1; 1; a += b, b /= 2) {\n                    if (t >= (7 - 4 * a) / 11) {\n                        const q = (11 - 6 * a - 11 * t) / 4\n                        return -q * q + b * b\n                    }\n                }\n            },\n\n            reverse: function(f) {\n                return function(t) {\n                    return 1 - f(1 - t)\n                }\n            },\n\n            reflect: function(f) {\n                return function(t) {\n                    return .5 * (t < .5 ? f(2 * t) : (2 - f(2 - 2 * t)))\n                }\n            },\n\n            clamp: function(f, n, x) {\n                n = n || 0\n                x = x || 1\n                return function(t) {\n                    const r = f(t)\n                    return r < n ? n : r > x ? x : r\n                }\n            },\n\n            back: function(s) {\n                if (!s) s = 1.70158\n                return function(t) {\n                    return t * t * ((s + 1) * t - s)\n                }\n            },\n\n            elastic: function(x) {\n                if (!x) x = 1.5\n                return function(t) {\n                    return Math.pow(2, 10 * (t - 1)) * Math.cos(20 * Math.PI * x / 3 * t)\n                }\n            }\n        },\n\n        interpolate: {\n\n            number: function(a, b) {\n                const d = b - a\n                return function(t) { return a + d * t }\n            },\n\n            object: function(a, b) {\n                const s = Object.keys(a)\n                return function(t) {\n                    let i; let p\n                    const r = {}\n                    for (i = s.length - 1; i != -1; i--) {\n                        p = s[i]\n                        r[p] = a[p] + (b[p] - a[p]) * t\n                    }\n                    return r\n                }\n            },\n\n            hexColor: function(a, b) {\n\n                const ca = parseInt(a.slice(1), 16)\n                const cb = parseInt(b.slice(1), 16)\n                const ra = ca & 0x0000ff\n                const rd = (cb & 0x0000ff) - ra\n                const ga = ca & 0x00ff00\n                const gd = (cb & 0x00ff00) - ga\n                const ba = ca & 0xff0000\n                const bd = (cb & 0xff0000) - ba\n\n                return function(t) {\n\n                    const r = (ra + rd * t) & 0x000000ff\n                    const g = (ga + gd * t) & 0x0000ff00\n                    const b = (ba + bd * t) & 0x00ff0000\n\n                    return `#${  (1 << 24 | r | g | b ).toString(16).slice(1)}`\n                }\n            },\n\n            unit: function(a, b) {\n\n                const r = /(-?[0-9]*.[0-9]*)(px|em|cm|mm|in|pt|pc|%)/\n                const ma = r.exec(a)\n                const mb = r.exec(b)\n                const p = mb[1].indexOf('.')\n                const f = p > 0 ? mb[1].length - p - 1 : 0\n                a = +ma[1]\n                const d = +mb[1] - a\n                const u = ma[2]\n\n                return function(t) {\n                    return (a + d * t).toFixed(f) + u\n                }\n            }\n        },\n\n        // SVG filters.\n        // (values in parentheses are default values)\n        filter: {\n\n            // `color` ... outline color ('blue')\n            // `width`... outline width (1)\n            // `opacity` ... outline opacity (1)\n            // `margin` ... gap between outline and the element (2)\n            outline: function(args) {\n\n                const tpl = '<filter><feFlood flood-color=\"${color}\" flood-opacity=\"${opacity}\" result=\"colored\"/><feMorphology in=\"SourceAlpha\" result=\"morphedOuter\" operator=\"dilate\" radius=\"${outerRadius}\" /><feMorphology in=\"SourceAlpha\" result=\"morphedInner\" operator=\"dilate\" radius=\"${innerRadius}\" /><feComposite result=\"morphedOuterColored\" in=\"colored\" in2=\"morphedOuter\" operator=\"in\"/><feComposite operator=\"xor\" in=\"morphedOuterColored\" in2=\"morphedInner\" result=\"outline\"/><feMerge><feMergeNode in=\"outline\"/><feMergeNode in=\"SourceGraphic\"/></feMerge></filter>'\n\n                const margin = Number.isFinite(args.margin) ? args.margin : 2\n                const width = Number.isFinite(args.width) ? args.width : 1\n\n                return joint.util.template(tpl)({\n                    color: args.color || 'blue',\n                    opacity: Number.isFinite(args.opacity) ? args.opacity : 1,\n                    outerRadius: margin + width,\n                    innerRadius: margin\n                })\n            },\n\n            // `color` ... color ('red')\n            // `width`... width (1)\n            // `blur` ... blur (0)\n            // `opacity` ... opacity (1)\n            highlight: function(args) {\n\n                const tpl = '<filter><feFlood flood-color=\"${color}\" flood-opacity=\"${opacity}\" result=\"colored\"/><feMorphology result=\"morphed\" in=\"SourceGraphic\" operator=\"dilate\" radius=\"${width}\"/><feComposite result=\"composed\" in=\"colored\" in2=\"morphed\" operator=\"in\"/><feGaussianBlur result=\"blured\" in=\"composed\" stdDeviation=\"${blur}\"/><feBlend in=\"SourceGraphic\" in2=\"blured\" mode=\"normal\"/></filter>'\n\n                return joint.util.template(tpl)({\n                    color: args.color || 'red',\n                    width: Number.isFinite(args.width) ? args.width : 1,\n                    blur: Number.isFinite(args.blur) ? args.blur : 0,\n                    opacity: Number.isFinite(args.opacity) ? args.opacity : 1\n                })\n            },\n\n            // `x` ... horizontal blur (2)\n            // `y` ... vertical blur (optional)\n            blur: function(args) {\n\n                const x = Number.isFinite(args.x) ? args.x : 2\n\n                return joint.util.template('<filter><feGaussianBlur stdDeviation=\"${stdDeviation}\"/></filter>')({\n                    stdDeviation: Number.isFinite(args.y) ? [x, args.y] : x\n                })\n            },\n\n            // `dx` ... horizontal shift (0)\n            // `dy` ... vertical shift (0)\n            // `blur` ... blur (4)\n            // `color` ... color ('black')\n            // `opacity` ... opacity (1)\n            dropShadow: function(args) {\n\n                const tpl = 'SVGFEDropShadowElement' in window\n                    ? '<filter><feDropShadow stdDeviation=\"${blur}\" dx=\"${dx}\" dy=\"${dy}\" flood-color=\"${color}\" flood-opacity=\"${opacity}\"/></filter>'\n                    : '<filter><feGaussianBlur in=\"SourceAlpha\" stdDeviation=\"${blur}\"/><feOffset dx=\"${dx}\" dy=\"${dy}\" result=\"offsetblur\"/><feFlood flood-color=\"${color}\"/><feComposite in2=\"offsetblur\" operator=\"in\"/><feComponentTransfer><feFuncA type=\"linear\" slope=\"${opacity}\"/></feComponentTransfer><feMerge><feMergeNode/><feMergeNode in=\"SourceGraphic\"/></feMerge></filter>'\n\n                return joint.util.template(tpl)({\n                    dx: args.dx || 0,\n                    dy: args.dy || 0,\n                    opacity: Number.isFinite(args.opacity) ? args.opacity : 1,\n                    color: args.color || 'black',\n                    blur: Number.isFinite(args.blur) ? args.blur : 4\n                })\n            },\n\n            // `amount` ... the proportion of the conversion (1). A value of 1 (default) is completely grayscale. A value of 0 leaves the input unchanged.\n            grayscale: function(args) {\n\n                const amount = Number.isFinite(args.amount) ? args.amount : 1\n\n                return joint.util.template('<filter><feColorMatrix type=\"matrix\" values=\"${a} ${b} ${c} 0 0 ${d} ${e} ${f} 0 0 ${g} ${b} ${h} 0 0 0 0 0 1 0\"/></filter>')({\n                    a: 0.2126 + 0.7874 * (1 - amount),\n                    b: 0.7152 - 0.7152 * (1 - amount),\n                    c: 0.0722 - 0.0722 * (1 - amount),\n                    d: 0.2126 - 0.2126 * (1 - amount),\n                    e: 0.7152 + 0.2848 * (1 - amount),\n                    f: 0.0722 - 0.0722 * (1 - amount),\n                    g: 0.2126 - 0.2126 * (1 - amount),\n                    h: 0.0722 + 0.9278 * (1 - amount)\n                })\n            },\n\n            // `amount` ... the proportion of the conversion (1). A value of 1 (default) is completely sepia. A value of 0 leaves the input unchanged.\n            sepia: function(args) {\n\n                const amount = Number.isFinite(args.amount) ? args.amount : 1\n\n                return joint.util.template('<filter><feColorMatrix type=\"matrix\" values=\"${a} ${b} ${c} 0 0 ${d} ${e} ${f} 0 0 ${g} ${h} ${i} 0 0 0 0 0 1 0\"/></filter>')({\n                    a: 0.393 + 0.607 * (1 - amount),\n                    b: 0.769 - 0.769 * (1 - amount),\n                    c: 0.189 - 0.189 * (1 - amount),\n                    d: 0.349 - 0.349 * (1 - amount),\n                    e: 0.686 + 0.314 * (1 - amount),\n                    f: 0.168 - 0.168 * (1 - amount),\n                    g: 0.272 - 0.272 * (1 - amount),\n                    h: 0.534 - 0.534 * (1 - amount),\n                    i: 0.131 + 0.869 * (1 - amount)\n                })\n            },\n\n            // `amount` ... the proportion of the conversion (1). A value of 0 is completely un-saturated. A value of 1 (default) leaves the input unchanged.\n            saturate: function(args) {\n\n                const amount = Number.isFinite(args.amount) ? args.amount : 1\n\n                return joint.util.template('<filter><feColorMatrix type=\"saturate\" values=\"${amount}\"/></filter>')({\n                    amount: 1 - amount\n                })\n            },\n\n            // `angle` ...  the number of degrees around the color circle the input samples will be adjusted (0).\n            hueRotate: function(args) {\n\n                return joint.util.template('<filter><feColorMatrix type=\"hueRotate\" values=\"${angle}\"/></filter>')({\n                    angle: args.angle || 0\n                })\n            },\n\n            // `amount` ... the proportion of the conversion (1). A value of 1 (default) is completely inverted. A value of 0 leaves the input unchanged.\n            invert: function(args) {\n\n                const amount = Number.isFinite(args.amount) ? args.amount : 1\n\n                return joint.util.template('<filter><feComponentTransfer><feFuncR type=\"table\" tableValues=\"${amount} ${amount2}\"/><feFuncG type=\"table\" tableValues=\"${amount} ${amount2}\"/><feFuncB type=\"table\" tableValues=\"${amount} ${amount2}\"/></feComponentTransfer></filter>')({\n                    amount: amount,\n                    amount2: 1 - amount\n                })\n            },\n\n            // `amount` ... proportion of the conversion (1). A value of 0 will create an image that is completely black. A value of 1 (default) leaves the input unchanged.\n            brightness: function(args) {\n\n                return joint.util.template('<filter><feComponentTransfer><feFuncR type=\"linear\" slope=\"${amount}\"/><feFuncG type=\"linear\" slope=\"${amount}\"/><feFuncB type=\"linear\" slope=\"${amount}\"/></feComponentTransfer></filter>')({\n                    amount: Number.isFinite(args.amount) ? args.amount : 1\n                })\n            },\n\n            // `amount` ... proportion of the conversion (1). A value of 0 will create an image that is completely black. A value of 1 (default) leaves the input unchanged.\n            contrast: function(args) {\n\n                const amount = Number.isFinite(args.amount) ? args.amount : 1\n\n                return joint.util.template('<filter><feComponentTransfer><feFuncR type=\"linear\" slope=\"${amount}\" intercept=\"${amount2}\"/><feFuncG type=\"linear\" slope=\"${amount}\" intercept=\"${amount2}\"/><feFuncB type=\"linear\" slope=\"${amount}\" intercept=\"${amount2}\"/></feComponentTransfer></filter>')({\n                    amount: amount,\n                    amount2: .5 - amount / 2\n                })\n            }\n        },\n\n        format: {\n\n            // Formatting numbers via the Python Format Specification Mini-language.\n            // See http://docs.python.org/release/3.1.3/library/string.html#format-specification-mini-language.\n            // Heavilly inspired by the D3.js library implementation.\n            number: function(specifier, value, locale) {\n\n                locale = locale || {\n\n                    currency: ['$', ''],\n                    decimal: '.',\n                    thousands: ',',\n                    grouping: [3]\n                }\n\n                // See Python format specification mini-language: http://docs.python.org/release/3.1.3/library/string.html#format-specification-mini-language.\n                // [[fill]align][sign][symbol][0][width][,][.precision][type]\n                const re = /(?:([^{])?([<>=^]))?([+\\- ])?([$#])?(0)?(\\d+)?(,)?(\\.-?\\d+)?([a-z%])?/i\n\n                const match = re.exec(specifier)\n                let fill = match[1] || ' '\n                let align = match[2] || '>'\n                const sign = match[3] || ''\n                const symbol = match[4] || ''\n                let zfill = match[5]\n                let width = +match[6]\n                let comma = match[7]\n                let precision = match[8]\n                let type = match[9]\n                let scale = 1\n                let prefix = ''\n                let suffix = ''\n                let integer = false\n\n                if (precision) precision = +precision.substring(1)\n\n                if (zfill || fill === '0' && align === '=') {\n                    zfill = fill = '0'\n                    align = '='\n                    if (comma) width -= Math.floor((width - 1) / 4)\n                }\n\n                switch (type) {\n                    case 'n':\n                        comma = true; type = 'g'\n                        break\n                    case '%':\n                        scale = 100; suffix = '%'; type = 'f'\n                        break\n                    case 'p':\n                        scale = 100; suffix = '%'; type = 'r'\n                        break\n                    case 'b':\n                    case 'o':\n                    case 'x':\n                    case 'X':\n                        if (symbol === '#') prefix = `0${  type.toLowerCase()}`\n                        break\n                    case 'c':\n                    case 'd':\n                        integer = true; precision = 0\n                        break\n                    case 's':\n                        scale = -1; type = 'r'\n                        break\n                }\n\n                if (symbol === '$') {\n                    prefix = locale.currency[0]\n                    suffix = locale.currency[1]\n                }\n\n                // If no precision is specified for `'r'`, fallback to general notation.\n                if (type == 'r' && !precision) type = 'g'\n\n                // Ensure that the requested precision is in the supported range.\n                if (precision != null) {\n                    if (type == 'g') precision = Math.max(1, Math.min(21, precision))\n                    else if (type == 'e' || type == 'f') precision = Math.max(0, Math.min(20, precision))\n                }\n\n                const zcomma = zfill && comma\n\n                // Return the empty string for floats formatted as ints.\n                if (integer && (value % 1)) return ''\n\n                // Convert negative to positive, and record the sign prefix.\n                let negative = value < 0 || value === 0 && 1 / value < 0 ? (value = -value, '-') : sign\n\n                let fullSuffix = suffix\n\n                // Apply the scale, computing it from the value's exponent for si format.\n                // Preserve the existing suffix, if any, such as the currency symbol.\n                if (scale < 0) {\n                    const unit = this.prefix(value, precision)\n                    value = unit.scale(value)\n                    fullSuffix = unit.symbol + suffix\n                } else {\n                    value *= scale\n                }\n\n                // Convert to the desired precision.\n                value = this.convert(type, value, precision)\n\n                // Break the value into the integer part (before) and decimal part (after).\n                const i = value.lastIndexOf('.')\n                let before = i < 0 ? value : value.substring(0, i)\n                const after = i < 0 ? '' : locale.decimal + value.substring(i + 1)\n\n                function formatGroup(value) {\n\n                    let i = value.length\n                    const t = []\n                    let j = 0\n                    let g = locale.grouping[0]\n                    while (i > 0 && g > 0) {\n                        t.push(value.substring(i -= g, i + g))\n                        g = locale.grouping[j = (j + 1) % locale.grouping.length]\n                    }\n                    return t.reverse().join(locale.thousands)\n                }\n\n                // If the fill character is not `'0'`, grouping is applied before padding.\n                if (!zfill && comma && locale.grouping) {\n\n                    before = formatGroup(before)\n                }\n\n                let length = prefix.length + before.length + after.length + (zcomma ? 0 : negative.length)\n                const padding = length < width ? new Array(length = width - length + 1).join(fill) : ''\n\n                // If the fill character is `'0'`, grouping is applied after padding.\n                if (zcomma) before = formatGroup(padding + before)\n\n                // Apply prefix.\n                negative += prefix\n\n                // Rejoin integer and decimal parts.\n                value = before + after\n\n                return (align === '<' ? negative + value + padding\n                    : align === '>' ? padding + negative + value\n                        : align === '^' ? padding.substring(0, length >>= 1) + negative + value + padding.substring(length)\n                            : negative + (zcomma ? value : padding + value)) + fullSuffix\n            },\n\n            // Formatting string via the Python Format string.\n            // See https://docs.python.org/2/library/string.html#format-string-syntax)\n            string: function(formatString, value) {\n\n                let fieldDelimiterIndex\n                let fieldDelimiter = '{'\n                let endPlaceholder = false\n                const formattedStringArray = []\n\n                while ((fieldDelimiterIndex = formatString.indexOf(fieldDelimiter)) !== -1) {\n\n                    var pieceFormatedString; var formatSpec; var fieldName\n\n                    pieceFormatedString = formatString.slice(0, fieldDelimiterIndex)\n\n                    if (endPlaceholder) {\n                        formatSpec = pieceFormatedString.split(':')\n                        fieldName = formatSpec.shift().split('.')\n                        pieceFormatedString = value\n\n                        for (let i = 0; i < fieldName.length; i++)\n                            pieceFormatedString = pieceFormatedString[fieldName[i]]\n\n                        if (formatSpec.length)\n                            pieceFormatedString = this.number(formatSpec, pieceFormatedString)\n                    }\n\n                    formattedStringArray.push(pieceFormatedString)\n\n                    formatString = formatString.slice(fieldDelimiterIndex + 1)\n                    endPlaceholder = !endPlaceholder\n                    fieldDelimiter = (endPlaceholder) ? '}' : '{'\n                }\n                formattedStringArray.push(formatString)\n\n                return formattedStringArray.join('')\n            },\n\n            convert: function(type, value, precision) {\n\n                switch (type) {\n                    case 'b': return value.toString(2)\n                    case 'c': return String.fromCharCode(value)\n                    case 'o': return value.toString(8)\n                    case 'x': return value.toString(16)\n                    case 'X': return value.toString(16).toUpperCase()\n                    case 'g': return value.toPrecision(precision)\n                    case 'e': return value.toExponential(precision)\n                    case 'f': return value.toFixed(precision)\n                    case 'r': return (value = this.round(value, this.precision(value, precision))).toFixed(Math.max(0, Math.min(20, this.precision(value * (1 + 1e-15), precision))))\n                    default: return `${value  }`\n                }\n            },\n\n            round: function(value, precision) {\n\n                return precision\n                    ? Math.round(value * (precision = Math.pow(10, precision))) / precision\n                    : Math.round(value)\n            },\n\n            precision: function(value, precision) {\n\n                return precision - (value ? Math.ceil(Math.log(value) / Math.LN10) : 1)\n            },\n\n            prefix: function(value, precision) {\n\n                const prefixes = ['y', 'z', 'a', 'f', 'p', 'n', 'µ', 'm', '', 'k', 'M', 'G', 'T', 'P', 'E', 'Z', 'Y'].map(function(d, i) {\n                    const k = Math.pow(10, Math.abs(8 - i) * 3)\n                    return {\n                        scale: i > 8 ? function(d) { return d / k } : function(d) { return d * k },\n                        symbol: d\n                    }\n                })\n\n                let i = 0\n                if (value) {\n                    if (value < 0) value *= -1\n                    if (precision) value = this.round(value, this.precision(value, precision))\n                    i = 1 + Math.floor(1e-12 + Math.log(value) / Math.LN10)\n                    i = Math.max(-24, Math.min(24, Math.floor((i <= 0 ? i + 1 : i - 1) / 3) * 3))\n                }\n                return prefixes[8 + i / 3]\n            }\n        },\n\n        /*\n            Pre-compile the HTML to be used as a template.\n        */\n        template: function(html) {\n\n            /*\n                Must support the variation in templating syntax found here:\n                https://lodash.com/docs#template\n            */\n            const regex = /<%= ([^ ]+) %>|\\$\\{ ?([^{} ]+) ?\\}|\\{\\{([^{} ]+)\\}\\}/g\n\n            return function(data) {\n\n                data = data || {}\n\n                return html.replace(regex, function(match) {\n\n                    const args = Array.from(arguments)\n                    const attr = args.slice(1, 4).find(function(_attr) {\n                        return !!_attr\n                    })\n\n                    const attrArray = attr.split('.')\n                    let value = data[attrArray.shift()]\n\n                    while (value !== undefined && attrArray.length) {\n                        value = value[attrArray.shift()]\n                    }\n\n                    return value !== undefined ? value : ''\n                })\n            }\n        },\n\n        /**\n         * @param {Element} el Element, which content is intent to display in full-screen mode, 'window.top.document.body' is default.\n         */\n        toggleFullScreen: function(el) {\n\n            const topDocument = window.top.document\n            el = el || topDocument.body\n\n            function prefixedResult(el, prop) {\n\n                const prefixes = ['webkit', 'moz', 'ms', 'o', '']\n                for (let i = 0; i < prefixes.length; i++) {\n                    const prefix = prefixes[i]\n                    const propName = prefix ? (prefix + prop) : (prop.substr(0, 1).toLowerCase() + prop.substr(1))\n                    if (el[propName] !== undefined) {\n                        return joint.util.isFunction(el[propName]) ? el[propName]() : el[propName]\n                    }\n                }\n            }\n\n            if (prefixedResult(topDocument, 'FullscreenElement') || prefixedResult(topDocument, 'FullScreenElement')) {\n                prefixedResult(topDocument, 'ExitFullscreen') || // Spec.\n                prefixedResult(topDocument, 'CancelFullScreen') // Firefox\n            } else {\n                prefixedResult(el, 'RequestFullscreen') || // Spec.\n                prefixedResult(el, 'RequestFullScreen') // Firefox\n            }\n        },\n\n        addClassNamePrefix: function(className) {\n\n            if (!className) return className\n\n            return className.toString().split(' ').map(function(_className) {\n\n                if (_className.substr(0, joint.config.classNamePrefix.length) !== joint.config.classNamePrefix) {\n                    _className = joint.config.classNamePrefix + _className\n                }\n\n                return _className\n\n            }).join(' ')\n        },\n\n        removeClassNamePrefix: function(className) {\n\n            if (!className) return className\n\n            return className.toString().split(' ').map(function(_className) {\n\n                if (_className.substr(0, joint.config.classNamePrefix.length) === joint.config.classNamePrefix) {\n                    _className = _className.substr(joint.config.classNamePrefix.length)\n                }\n\n                return _className\n\n            }).join(' ')\n        },\n\n        wrapWith: function(object, methods, wrapper) {\n\n            if (joint.util.isString(wrapper)) {\n\n                if (!joint.util.wrappers[wrapper]) {\n                    throw new Error(`Unknown wrapper: \"${  wrapper  }\"`)\n                }\n\n                wrapper = joint.util.wrappers[wrapper]\n            }\n\n            if (!joint.util.isFunction(wrapper)) {\n                throw new Error('Wrapper must be a function.')\n            }\n\n            this.toArray(methods).forEach(function(method) {\n                object[method] = wrapper(object[method])\n            })\n        },\n\n        wrappers: {\n\n            /*\n                Prepares a function with the following usage:\n\n                    fn([cell, cell, cell], opt);\n                    fn([cell, cell, cell]);\n                    fn(cell, cell, cell, opt);\n                    fn(cell, cell, cell);\n                    fn(cell);\n            */\n            cells: function(fn) {\n\n                return function() {\n\n                    const args = Array.from(arguments)\n                    const n = args.length\n                    let cells = n > 0 && args[0] || []\n                    let opt = n > 1 && args[n - 1] || {}\n\n                    if (!Array.isArray(cells)) {\n\n                        if (opt instanceof joint.dia.Cell) {\n                            cells = args\n                        } else if (cells instanceof joint.dia.Cell) {\n                            if (args.length > 1) {\n                                args.pop()\n                            }\n                            cells = args\n                        }\n                    }\n\n                    if (opt instanceof joint.dia.Cell) {\n                        opt = {}\n                    }\n\n                    return fn.call(this, cells, opt)\n                }\n            }\n        },\n\n        parseDOMJSON: function(json, namespace) {\n\n            const selectors = {}\n            const svgNamespace = V.namespace.xmlns\n            let ns = namespace || svgNamespace\n            const fragment = document.createDocumentFragment()\n            const queue = [json, fragment, ns]\n            while (queue.length > 0) {\n                ns = queue.pop()\n                const parentNode = queue.pop()\n                const siblingsDef = queue.pop()\n                for (let i = 0, n = siblingsDef.length; i < n; i++) {\n                    const nodeDef = siblingsDef[i]\n                    // TagName\n                    if (!nodeDef.hasOwnProperty('tagName')) throw new Error('json-dom-parser: missing tagName')\n                    const {tagName} = nodeDef\n                    // Namespace URI\n                    if (nodeDef.hasOwnProperty('namespaceURI')) ns = nodeDef.namespaceURI\n                    const node = document.createElementNS(ns, tagName)\n                    const svg = (ns === svgNamespace)\n                    const wrapper = (svg) ? V : $\n                    // Attributes\n                    const {attributes} = nodeDef\n                    if (attributes) wrapper(node).attr(attributes)\n                    // Style\n                    const {style} = nodeDef\n                    if (style) $(node).css(style)\n                    // ClassName\n                    if (nodeDef.hasOwnProperty('className')) {\n                        const {className} = nodeDef\n                        if (svg) {\n                            node.className.baseVal = className\n                        } else {\n                            node.className = className\n                        }\n                    }\n                    // Selector\n                    if (nodeDef.hasOwnProperty('selector')) {\n                        const nodeSelector = nodeDef.selector\n                        if (selectors[nodeSelector]) throw new Error('json-dom-parser: selector must be unique')\n                        selectors[nodeSelector] = node\n                        wrapper(node).attr('joint-selector', nodeSelector)\n                    }\n                    parentNode.appendChild(node)\n                    // Children\n                    const childrenDef = nodeDef.children\n                    if (Array.isArray(childrenDef)) queue.push(childrenDef, node, ns)\n                }\n            }\n            return {\n                fragment: fragment,\n                selectors: selectors\n            }\n        },\n\n        /* global _:true */\n\n        // Copy all the properties to the first argument from the following arguments.\n        // All the properties will be overwritten by the properties from the following\n        // arguments. Inherited properties are ignored.\n        mixin: _.assign,\n\n        // Copy all properties to the first argument from the following\n        // arguments only in case if they don't exists in the first argument.\n        // All the function propererties in the first argument will get\n        // additional property base pointing to the extenders same named\n        // property function's call method.\n        supplement: _.defaults,\n\n        // Same as `mixin()` but deep version.\n        deepMixin: _.mixin,\n\n        // Same as `supplement()` but deep version.\n        deepSupplement: _.defaultsDeep,\n\n        // lodash 3 vs 4 incompatible\n        sortedIndex: _.sortedIndexBy || _.sortedIndex,\n        uniq: _.uniqBy || _.uniq,\n        uniqueId: _.uniqueId,\n        sortBy: _.sortBy,\n        isFunction: _.isFunction,\n        result: _.result,\n        union: _.union,\n        invoke: _.invokeMap || _.invoke,\n        difference: _.difference,\n        intersection: _.intersection,\n        omit: _.omit,\n        pick: _.pick,\n        has: _.has,\n        bindAll: _.bindAll,\n        assign: _.assign,\n        defaults: _.defaults,\n        defaultsDeep: _.defaultsDeep,\n        isPlainObject: _.isPlainObject,\n        isEmpty: _.isEmpty,\n        isEqual: _.isEqual,\n        cloneDeep: _.cloneDeep,\n        toArray: _.toArray,\n        flattenDeep: _.flattenDeep,\n        camelCase: _.camelCase,\n        groupBy: _.groupBy,\n        forIn: _.forIn,\n        without: _.without,\n        debounce: _.debounce,\n        clone: _.clone,\n\n        merge: function() {\n            if (_.mergeWith) {\n                const args = Array.from(arguments)\n                const last = args[args.length - 1]\n\n                const customizer =  this.isFunction(last) ? last : this.noop\n                args.push(function(a,b) {\n                    const customResult = customizer(a, b)\n                    if (customResult !== undefined) {\n                        return customResult\n                    }\n\n                    if (Array.isArray(a) && !Array.isArray(b)) {\n                        return b\n                    }\n                })\n\n                return _.mergeWith.apply(this, args)\n            }\n            return _.merge.apply(this, arguments)\n        },\n\n        /* global _:false */\n\n        noop: function() {},\n\n        isBoolean: function(value) {\n            const {toString} = Object.prototype\n            return value === true || value === false || (!!value && typeof value === 'object' && toString.call(value) === '[object Boolean]')\n        },\n\n        isObject: function(value) {\n            return !!value && (typeof value === 'object' || typeof value === 'function')\n        },\n\n        isNumber: function(value) {\n            const {toString} = Object.prototype\n            return typeof value === 'number' || (!!value && typeof value === 'object' && toString.call(value) === '[object Number]')\n        },\n\n        isString: function(value) {\n            const {toString} = Object.prototype\n            return typeof value === 'string' || (!!value && typeof value === 'object' && toString.call(value) === '[object String]')\n        }\n    }\n}\n\n\njoint.mvc.View = Backbone.View.extend({\n\n    options: {},\n    theme: null,\n    themeClassNamePrefix: joint.util.addClassNamePrefix('theme-'),\n    requireSetThemeOverride: false,\n    defaultTheme: joint.config.defaultTheme,\n    children: null,\n    childNodes: null,\n\n    constructor: function(options) {\n\n        this.requireSetThemeOverride = options && !!options.theme\n        this.options = joint.util.assign({}, this.options, options)\n\n        Backbone.View.call(this, options)\n    },\n\n    initialize: function(options) {\n\n        joint.util.bindAll(this, 'setTheme', 'onSetTheme', 'remove', 'onRemove')\n\n        joint.mvc.views[this.cid] = this\n\n        this.setTheme(this.options.theme || this.defaultTheme)\n        this.init()\n    },\n\n    renderChildren: function(children) {\n        children || (children = this.children)\n        if (children) {\n            const namespace = V.namespace[this.svgElement ? 'xmlns' : 'xhtml']\n            const doc = joint.util.parseDOMJSON(children, namespace)\n            this.vel.empty().append(doc.fragment)\n            this.childNodes = doc.selectors\n        }\n        return this\n    },\n\n    // Override the Backbone `_ensureElement()` method in order to create an\n    // svg element (e.g., `<g>`) node that wraps all the nodes of the Cell view.\n    // Expose class name setter as a separate method.\n    _ensureElement: function() {\n        if (!this.el) {\n            const tagName = joint.util.result(this, 'tagName')\n            const attrs = joint.util.assign({}, joint.util.result(this, 'attributes'))\n            if (this.id) attrs.id = joint.util.result(this, 'id')\n            this.setElement(this._createElement(tagName))\n            this._setAttributes(attrs)\n        } else {\n            this.setElement(joint.util.result(this, 'el'))\n        }\n        this._ensureElClassName()\n    },\n\n    _setAttributes: function(attrs) {\n        if (this.svgElement) {\n            this.vel.attr(attrs)\n        } else {\n            this.$el.attr(attrs)\n        }\n    },\n\n    _createElement: function(tagName) {\n        if (this.svgElement) {\n            return document.createElementNS(V.namespace.xmlns, tagName)\n        } else {\n            return document.createElement(tagName)\n        }\n    },\n\n    // Utilize an alternative DOM manipulation API by\n    // adding an element reference wrapped in Vectorizer.\n    _setElement: function(el) {\n        this.$el = el instanceof Backbone.$ ? el : Backbone.$(el)\n        this.el = this.$el[0]\n        if (this.svgElement) this.vel = V(this.el)\n    },\n\n    _ensureElClassName: function() {\n        const className = joint.util.result(this, 'className')\n        const prefixedClassName = joint.util.addClassNamePrefix(className)\n        // Note: className removal here kept for backwards compatibility only\n        if (this.svgElement) {\n            this.vel.removeClass(className).addClass(prefixedClassName)\n        } else {\n            this.$el.removeClass(className).addClass(prefixedClassName)\n        }\n    },\n\n    init: function() {\n        // Intentionally empty.\n        // This method is meant to be overriden.\n    },\n\n    onRender: function() {\n        // Intentionally empty.\n        // This method is meant to be overriden.\n    },\n\n    setTheme: function(theme, opt) {\n\n        opt = opt || {}\n\n        // Theme is already set, override is required, and override has not been set.\n        // Don't set the theme.\n        if (this.theme && this.requireSetThemeOverride && !opt.override) {\n            return this\n        }\n\n        this.removeThemeClassName()\n        this.addThemeClassName(theme)\n        this.onSetTheme(this.theme/* oldTheme */, theme/* newTheme */)\n        this.theme = theme\n\n        return this\n    },\n\n    addThemeClassName: function(theme) {\n\n        theme = theme || this.theme\n\n        const className = this.themeClassNamePrefix + theme\n\n        if (this.svgElement) {\n            this.vel.addClass(className)\n        } else {\n            this.$el.addClass(className)\n        }\n\n        return this\n    },\n\n    removeThemeClassName: function(theme) {\n\n        theme = theme || this.theme\n\n        const className = this.themeClassNamePrefix + theme\n\n        if (this.svgElement) {\n            this.vel.removeClass(className)\n        } else {\n            this.$el.removeClass(className)\n        }\n\n        return this\n    },\n\n    onSetTheme: function(oldTheme, newTheme) {\n        // Intentionally empty.\n        // This method is meant to be overriden.\n    },\n\n    remove: function() {\n\n        this.onRemove()\n        this.undelegateDocumentEvents()\n\n        joint.mvc.views[this.cid] = null\n\n        Backbone.View.prototype.remove.apply(this, arguments)\n\n        return this\n    },\n\n    onRemove: function() {\n        // Intentionally empty.\n        // This method is meant to be overriden.\n    },\n\n    getEventNamespace: function() {\n        // Returns a per-session unique namespace\n        return `.joint-event-ns-${  this.cid}`\n    },\n\n    delegateElementEvents: function(element, events, data) {\n        if (!events) return this\n        data || (data = {})\n        const eventNS = this.getEventNamespace()\n        for (const eventName in events) {\n            let method = events[eventName]\n            if (typeof method !== 'function') method = this[method]\n            if (!method) continue\n            $(element).on(eventName + eventNS, data, method.bind(this))\n        }\n        return this\n    },\n\n    undelegateElementEvents: function(element) {\n        $(element).off(this.getEventNamespace())\n        return this\n    },\n\n    delegateDocumentEvents: function(events, data) {\n        events || (events = joint.util.result(this, 'documentEvents'))\n        return this.delegateElementEvents(document, events, data)\n    },\n\n    undelegateDocumentEvents: function() {\n        return this.undelegateElementEvents(document)\n    },\n\n    eventData: function(evt, data) {\n        if (!evt) throw new Error('eventData(): event object required.')\n        let currentData = evt.data\n        const key = `__${  this.cid  }__`\n        if (data === undefined) {\n            if (!currentData) return {}\n            return currentData[key] || {}\n        }\n        currentData || (currentData = evt.data = {})\n        currentData[key] || (currentData[key] = {})\n        joint.util.assign(currentData[key], data)\n        return this\n    }\n\n}, {\n\n    extend: function() {\n\n        const args = Array.from(arguments)\n\n        // Deep clone the prototype and static properties objects.\n        // This prevents unexpected behavior where some properties are overwritten outside of this function.\n        const protoProps = args[0] && joint.util.assign({}, args[0]) || {}\n        const staticProps = args[1] && joint.util.assign({}, args[1]) || {}\n\n        // Need the real render method so that we can wrap it and call it later.\n        const renderFn = protoProps.render || (this.prototype && this.prototype.render) || null\n\n        /*\n            Wrap the real render method so that:\n                .. `onRender` is always called.\n                .. `this` is always returned.\n        */\n        protoProps.render = function() {\n\n            if (renderFn) {\n                // Call the original render method.\n                renderFn.apply(this, arguments)\n            }\n\n            // Should always call onRender() method.\n            this.onRender()\n\n            // Should always return itself.\n            return this\n        }\n\n        return Backbone.View.extend.call(this, protoProps, staticProps)\n    }\n})\n\n\n\njoint.dia.GraphCells = Backbone.Collection.extend({\n\n    cellNamespace: joint.shapes,\n\n    initialize: function(models, opt) {\n\n        // Set the optional namespace where all model classes are defined.\n        if (opt.cellNamespace) {\n            this.cellNamespace = opt.cellNamespace\n        }\n\n        this.graph = opt.graph\n    },\n\n    model: function(attrs, opt) {\n\n        const {collection} = opt\n        const namespace = collection.cellNamespace\n\n        // Find the model class in the namespace or use the default one.\n        const ModelClass = (attrs.type === 'link')\n            ? joint.dia.Link\n            : joint.util.getByPath(namespace, attrs.type, '.') || joint.dia.Element\n\n        const cell = new ModelClass(attrs, opt)\n        // Add a reference to the graph. It is necessary to do this here because this is the earliest place\n        // where a new model is created from a plain JS object. For other objects, see `joint.dia.Graph>>_prepareCell()`.\n        if (!opt.dry) {\n            cell.graph = collection.graph\n        }\n\n        return cell\n    },\n\n    // `comparator` makes it easy to sort cells based on their `z` index.\n    comparator: function(model) {\n\n        return model.get('z') || 0\n    }\n})\n\n\njoint.dia.Graph = Backbone.Model.extend({\n\n    _batches: {},\n\n    initialize: function(attrs, opt) {\n\n        opt = opt || {}\n\n        // Passing `cellModel` function in the options object to graph allows for\n        // setting models based on attribute objects. This is especially handy\n        // when processing JSON graphs that are in a different than JointJS format.\n        const cells = new joint.dia.GraphCells([], {\n            model: opt.cellModel,\n            cellNamespace: opt.cellNamespace,\n            graph: this\n        })\n        Backbone.Model.prototype.set.call(this, 'cells', cells)\n\n        // Make all the events fired in the `cells` collection available.\n        // to the outside world.\n        cells.on('all', this.trigger, this)\n\n        // Backbone automatically doesn't trigger re-sort if models attributes are changed later when\n        // they're already in the collection. Therefore, we're triggering sort manually here.\n        this.on('change:z', this._sortOnChangeZ, this)\n\n        // `joint.dia.Graph` keeps an internal data structure (an adjacency list)\n        // for fast graph queries. All changes that affect the structure of the graph\n        // must be reflected in the `al` object. This object provides fast answers to\n        // questions such as \"what are the neighbours of this node\" or \"what\n        // are the sibling links of this link\".\n\n        // Outgoing edges per node. Note that we use a hash-table for the list\n        // of outgoing edges for a faster lookup.\n        // [nodeId] -> Object [edgeId] -> true\n        this._out = {}\n        // Ingoing edges per node.\n        // [nodeId] -> Object [edgeId] -> true\n        this._in = {}\n        // `_nodes` is useful for quick lookup of all the elements in the graph, without\n        // having to go through the whole cells array.\n        // [node ID] -> true\n        this._nodes = {}\n        // `_edges` is useful for quick lookup of all the links in the graph, without\n        // having to go through the whole cells array.\n        // [edgeId] -> true\n        this._edges = {}\n\n        cells.on('add', this._restructureOnAdd, this)\n        cells.on('remove', this._restructureOnRemove, this)\n        cells.on('reset', this._restructureOnReset, this)\n        cells.on('change:source', this._restructureOnChangeSource, this)\n        cells.on('change:target', this._restructureOnChangeTarget, this)\n        cells.on('remove', this._removeCell, this)\n    },\n\n    _sortOnChangeZ: function() {\n\n        this.get('cells').sort()\n    },\n\n    _restructureOnAdd: function(cell) {\n\n        if (cell.isLink()) {\n            this._edges[cell.id] = true\n            const source = cell.source()\n            const target = cell.target()\n            if (source.id) {\n                (this._out[source.id] || (this._out[source.id] = {}))[cell.id] = true\n            }\n            if (target.id) {\n                (this._in[target.id] || (this._in[target.id] = {}))[cell.id] = true\n            }\n        } else {\n            this._nodes[cell.id] = true\n        }\n    },\n\n    _restructureOnRemove: function(cell) {\n\n        if (cell.isLink()) {\n            delete this._edges[cell.id]\n            const source = cell.source()\n            const target = cell.target()\n            if (source.id && this._out[source.id] && this._out[source.id][cell.id]) {\n                delete this._out[source.id][cell.id]\n            }\n            if (target.id && this._in[target.id] && this._in[target.id][cell.id]) {\n                delete this._in[target.id][cell.id]\n            }\n        } else {\n            delete this._nodes[cell.id]\n        }\n    },\n\n    _restructureOnReset: function(cells) {\n\n        // Normalize into an array of cells. The original `cells` is GraphCells Backbone collection.\n        cells = cells.models\n\n        this._out = {}\n        this._in = {}\n        this._nodes = {}\n        this._edges = {}\n\n        cells.forEach(this._restructureOnAdd, this)\n    },\n\n    _restructureOnChangeSource: function(link) {\n\n        const prevSource = link.previous('source')\n        if (prevSource.id && this._out[prevSource.id]) {\n            delete this._out[prevSource.id][link.id]\n        }\n        const source = link.source()\n        if (source.id) {\n            (this._out[source.id] || (this._out[source.id] = {}))[link.id] = true\n        }\n    },\n\n    _restructureOnChangeTarget: function(link) {\n\n        const prevTarget = link.previous('target')\n        if (prevTarget.id && this._in[prevTarget.id]) {\n            delete this._in[prevTarget.id][link.id]\n        }\n        const target = link.get('target')\n        if (target.id) {\n            (this._in[target.id] || (this._in[target.id] = {}))[link.id] = true\n        }\n    },\n\n    // Return all outbound edges for the node. Return value is an object\n    // of the form: [edgeId] -> true\n    getOutboundEdges: function(node) {\n\n        return (this._out && this._out[node]) || {}\n    },\n\n    // Return all inbound edges for the node. Return value is an object\n    // of the form: [edgeId] -> true\n    getInboundEdges: function(node) {\n\n        return (this._in && this._in[node]) || {}\n    },\n\n    toJSON: function() {\n\n        // Backbone does not recursively call `toJSON()` on attributes that are themselves models/collections.\n        // It just clones the attributes. Therefore, we must call `toJSON()` on the cells collection explicitely.\n        const json = Backbone.Model.prototype.toJSON.apply(this, arguments)\n        json.cells = this.get('cells').toJSON()\n        return json\n    },\n\n    fromJSON: function(json, opt) {\n\n        if (!json.cells) {\n\n            throw new Error('Graph JSON must contain cells array.')\n        }\n\n        return this.set(json, opt)\n    },\n\n    set: function(key, val, opt) {\n\n        let attrs\n\n        // Handle both `key`, value and {key: value} style arguments.\n        if (typeof key === 'object') {\n            attrs = key\n            opt = val\n        } else {\n            (attrs = {})[key] = val\n        }\n\n        // Make sure that `cells` attribute is handled separately via resetCells().\n        if (attrs.hasOwnProperty('cells')) {\n            this.resetCells(attrs.cells, opt)\n            attrs = joint.util.omit(attrs, 'cells')\n        }\n\n        // The rest of the attributes are applied via original set method.\n        return Backbone.Model.prototype.set.call(this, attrs, opt)\n    },\n\n    clear: function(opt) {\n\n        opt = joint.util.assign({}, opt, { clear: true })\n\n        const collection = this.get('cells')\n\n        if (collection.length === 0) return this\n\n        this.startBatch('clear', opt)\n\n        // The elements come after the links.\n        const cells = collection.sortBy(function(cell) {\n            return cell.isLink() ? 1 : 2\n        })\n\n        do {\n\n            // Remove all the cells one by one.\n            // Note that all the links are removed first, so it's\n            // safe to remove the elements without removing the connected\n            // links first.\n            cells.shift().remove(opt)\n\n        } while (cells.length > 0)\n\n        this.stopBatch('clear')\n\n        return this\n    },\n\n    _prepareCell: function(cell, opt) {\n\n        let attrs\n        if (cell instanceof Backbone.Model) {\n            attrs = cell.attributes\n            if (!cell.graph && (!opt || !opt.dry)) {\n                // An element can not be member of more than one graph.\n                // A cell stops being the member of the graph after it's explicitly removed.\n                cell.graph = this\n            }\n        } else {\n            // In case we're dealing with a plain JS object, we have to set the reference\n            // to the `graph` right after the actual model is created. This happens in the `model()` function\n            // of `joint.dia.GraphCells`.\n            attrs = cell\n        }\n\n        if (!joint.util.isString(attrs.type)) {\n            throw new TypeError('dia.Graph: cell type must be a string.')\n        }\n\n        return cell\n    },\n\n    minZIndex: function() {\n\n        const firstCell = this.get('cells').first()\n        return firstCell ? (firstCell.get('z') || 0) : 0\n    },\n\n    maxZIndex: function() {\n\n        const lastCell = this.get('cells').last()\n        return lastCell ? (lastCell.get('z') || 0) : 0\n    },\n\n    addCell: function(cell, opt) {\n\n        if (Array.isArray(cell)) {\n\n            return this.addCells(cell, opt)\n        }\n\n        if (cell instanceof Backbone.Model) {\n\n            if (!cell.has('z')) {\n                cell.set('z', this.maxZIndex() + 1)\n            }\n\n        } else if (cell.z === undefined) {\n\n            cell.z = this.maxZIndex() + 1\n        }\n\n        this.get('cells').add(this._prepareCell(cell, opt), opt || {})\n\n        return this\n    },\n\n    addCells: function(cells, opt) {\n\n        if (cells.length) {\n\n            cells = joint.util.flattenDeep(cells)\n            opt.position = cells.length\n\n            this.startBatch('add')\n            cells.forEach(function(cell) {\n                opt.position--\n                this.addCell(cell, opt)\n            }, this)\n            this.stopBatch('add')\n        }\n\n        return this\n    },\n\n    // When adding a lot of cells, it is much more efficient to\n    // reset the entire cells collection in one go.\n    // Useful for bulk operations and optimizations.\n    resetCells: function(cells, opt) {\n\n        const preparedCells = joint.util.toArray(cells).map(function(cell) {\n            return this._prepareCell(cell, opt)\n        }, this)\n        this.get('cells').reset(preparedCells, opt)\n\n        return this\n    },\n\n    removeCells: function(cells, opt) {\n\n        if (cells.length) {\n\n            this.startBatch('remove')\n            joint.util.invoke(cells, 'remove', opt)\n            this.stopBatch('remove')\n        }\n\n        return this\n    },\n\n    _removeCell: function(cell, collection, options) {\n\n        options = options || {}\n\n        if (!options.clear) {\n            // Applications might provide a `disconnectLinks` option set to `true` in order to\n            // disconnect links when a cell is removed rather then removing them. The default\n            // is to remove all the associated links.\n            if (options.disconnectLinks) {\n\n                this.disconnectLinks(cell, options)\n\n            } else {\n\n                this.removeLinks(cell, options)\n            }\n        }\n        // Silently remove the cell from the cells collection. Silently, because\n        // `joint.dia.Cell.prototype.remove` already triggers the `remove` event which is\n        // then propagated to the graph model. If we didn't remove the cell silently, two `remove` events\n        // would be triggered on the graph model.\n        this.get('cells').remove(cell, { silent: true })\n\n        if (cell.graph === this) {\n            // Remove the element graph reference only if the cell is the member of this graph.\n            cell.graph = null\n        }\n    },\n\n    // Get a cell by `id`.\n    getCell: function(id) {\n\n        return this.get('cells').get(id)\n    },\n\n    getCells: function() {\n\n        return this.get('cells').toArray()\n    },\n\n    getElements: function() {\n\n        return Object.keys(this._nodes).map(this.getCell, this)\n    },\n\n    getLinks: function() {\n\n        return Object.keys(this._edges).map(this.getCell, this)\n    },\n\n    getFirstCell: function() {\n\n        return this.get('cells').first()\n    },\n\n    getLastCell: function() {\n\n        return this.get('cells').last()\n    },\n\n    // Get all inbound and outbound links connected to the cell `model`.\n    getConnectedLinks: function(model, opt) {\n\n        opt = opt || {}\n\n        let {inbound} = opt\n        let {outbound} = opt\n        if ((inbound === undefined) && (outbound === undefined)) {\n            inbound = outbound = true\n        }\n\n        // the final array of connected link models\n        const links = []\n        // a hash table of connected edges of the form: [edgeId] -> true\n        // used for quick lookups to check if we already added a link\n        const edges = {}\n\n        if (outbound) {\n            joint.util.forIn(this.getOutboundEdges(model.id), function(exists, edge) {\n                if (!edges[edge]) {\n                    links.push(this.getCell(edge))\n                    edges[edge] = true\n                }\n            }.bind(this))\n        }\n        if (inbound) {\n            joint.util.forIn(this.getInboundEdges(model.id), function(exists, edge) {\n                // skip links that were already added\n                // (those must be self-loop links)\n                // (because they are inbound and outbound edges of the same two elements)\n                if (!edges[edge]) {\n                    links.push(this.getCell(edge))\n                    edges[edge] = true\n                }\n            }.bind(this))\n        }\n\n        // if `deep` option is `true`, check also all the links that are connected to any of the descendant cells\n        if (opt.deep) {\n\n            const embeddedCells = model.getEmbeddedCells({ deep: true })\n\n            // in the first round, we collect all the embedded elements\n            const embeddedElements = {}\n            embeddedCells.forEach(function(cell) {\n                if (cell.isElement()) {\n                    embeddedElements[cell.id] = true\n                }\n            })\n\n            embeddedCells.forEach(function(cell) {\n                if (cell.isLink()) return\n                if (outbound) {\n                    joint.util.forIn(this.getOutboundEdges(cell.id), function(exists, edge) {\n                        if (!edges[edge]) {\n                            const edgeCell = this.getCell(edge)\n                            const sourceId = edgeCell.source().id\n                            const targetId = edgeCell.target().id\n\n                            // if `includeEnclosed` option is falsy, skip enclosed links\n                            if (!opt.includeEnclosed\n                                && (sourceId && embeddedElements[sourceId])\n                                && (targetId && embeddedElements[targetId])) {\n                                return\n                            }\n\n                            links.push(this.getCell(edge))\n                            edges[edge] = true\n                        }\n                    }.bind(this))\n                }\n                if (inbound) {\n                    joint.util.forIn(this.getInboundEdges(cell.id), function(exists, edge) {\n                        if (!edges[edge]) {\n                            const edgeCell = this.getCell(edge)\n                            const sourceId = edgeCell.source().id\n                            const targetId = edgeCell.target().id\n\n                            // if `includeEnclosed` option is falsy, skip enclosed links\n                            if (!opt.includeEnclosed\n                                && (sourceId && embeddedElements[sourceId])\n                                && (targetId && embeddedElements[targetId])) {\n                                return\n                            }\n\n                            links.push(this.getCell(edge))\n                            edges[edge] = true\n                        }\n                    }.bind(this))\n                }\n            }, this)\n        }\n\n        return links\n    },\n\n    getNeighbors: function(model, opt) {\n\n        opt = opt || {}\n\n        let {inbound} = opt\n        let {outbound} = opt\n        if (inbound === undefined && outbound === undefined) {\n            inbound = outbound = true\n        }\n\n        const neighbors = this.getConnectedLinks(model, opt).reduce(function(res, link) {\n\n            const source = link.source()\n            const target = link.target()\n            const loop = link.hasLoop(opt)\n\n            // Discard if it is a point, or if the neighbor was already added.\n            if (inbound && joint.util.has(source, 'id') && !res[source.id]) {\n\n                const sourceElement = this.getCell(source.id)\n\n                if (loop || (sourceElement && sourceElement !== model && (!opt.deep || !sourceElement.isEmbeddedIn(model)))) {\n                    res[source.id] = sourceElement\n                }\n            }\n\n            // Discard if it is a point, or if the neighbor was already added.\n            if (outbound && joint.util.has(target, 'id') && !res[target.id]) {\n\n                const targetElement = this.getCell(target.id)\n\n                if (loop || (targetElement && targetElement !== model && (!opt.deep || !targetElement.isEmbeddedIn(model)))) {\n                    res[target.id] = targetElement\n                }\n            }\n\n            return res\n        }.bind(this), {})\n\n        return joint.util.toArray(neighbors)\n    },\n\n    getCommonAncestor: function(/* cells */) {\n\n        let cellsAncestors = Array.from(arguments).map(function(cell) {\n\n            const ancestors = []\n            let parentId = cell.get('parent')\n\n            while (parentId) {\n\n                ancestors.push(parentId)\n                parentId = this.getCell(parentId).get('parent')\n            }\n\n            return ancestors\n\n        }, this)\n\n        cellsAncestors = cellsAncestors.sort(function(a, b) {\n            return a.length - b.length\n        })\n\n        const commonAncestor = joint.util.toArray(cellsAncestors.shift()).find(function(ancestor) {\n            return cellsAncestors.every(function(cellAncestors) {\n                return cellAncestors.includes(ancestor)\n            })\n        })\n\n        return this.getCell(commonAncestor)\n    },\n\n    // Find the whole branch starting at `element`.\n    // If `opt.deep` is `true`, take into account embedded elements too.\n    // If `opt.breadthFirst` is `true`, use the Breadth-first search algorithm, otherwise use Depth-first search.\n    getSuccessors: function(element, opt) {\n\n        opt = opt || {}\n        const res = []\n        // Modify the options so that it includes the `outbound` neighbors only. In other words, search forwards.\n        this.search(element, function(el) {\n            if (el !== element) {\n                res.push(el)\n            }\n        }, joint.util.assign({}, opt, { outbound: true }))\n        return res\n    },\n\n    // Clone `cells` returning an object that maps the original cell ID to the clone. The number\n    // of clones is exactly the same as the `cells.length`.\n    // This function simply clones all the `cells`. However, it also reconstructs\n    // all the `source/target` and `parent/embed` references within the `cells`.\n    // This is the main difference from the `cell.clone()` method. The\n    // `cell.clone()` method works on one single cell only.\n    // For example, for a graph: `A --- L ---> B`, `cloneCells([A, L, B])`\n    // returns `[A2, L2, B2]` resulting to a graph: `A2 --- L2 ---> B2`, i.e.\n    // the source and target of the link `L2` is changed to point to `A2` and `B2`.\n    cloneCells: function(cells) {\n\n        cells = joint.util.uniq(cells)\n\n        // A map of the form [original cell ID] -> [clone] helping\n        // us to reconstruct references for source/target and parent/embeds.\n        // This is also the returned value.\n        const cloneMap = joint.util.toArray(cells).reduce(function(map, cell) {\n            map[cell.id] = cell.clone()\n            return map\n        }, {})\n\n        joint.util.toArray(cells).forEach(function(cell) {\n\n            const clone = cloneMap[cell.id]\n            // assert(clone exists)\n\n            if (clone.isLink()) {\n                const source = clone.source()\n                const target = clone.target()\n                if (source.id && cloneMap[source.id]) {\n                    // Source points to an element and the element is among the clones.\n                    // => Update the source of the cloned link.\n                    clone.prop('source/id', cloneMap[source.id].id)\n                }\n                if (target.id && cloneMap[target.id]) {\n                    // Target points to an element and the element is among the clones.\n                    // => Update the target of the cloned link.\n                    clone.prop('target/id', cloneMap[target.id].id)\n                }\n            }\n\n            // Find the parent of the original cell\n            const parent = cell.get('parent')\n            if (parent && cloneMap[parent]) {\n                clone.set('parent', cloneMap[parent].id)\n            }\n\n            // Find the embeds of the original cell\n            const embeds = joint.util.toArray(cell.get('embeds')).reduce(function(newEmbeds, embed) {\n                // Embedded cells that are not being cloned can not be carried\n                // over with other embedded cells.\n                if (cloneMap[embed]) {\n                    newEmbeds.push(cloneMap[embed].id)\n                }\n                return newEmbeds\n            }, [])\n\n            if (!joint.util.isEmpty(embeds)) {\n                clone.set('embeds', embeds)\n            }\n        })\n\n        return cloneMap\n    },\n\n    // Clone the whole subgraph (including all the connected links whose source/target is in the subgraph).\n    // If `opt.deep` is `true`, also take into account all the embedded cells of all the subgraph cells.\n    // Return a map of the form: [original cell ID] -> [clone].\n    cloneSubgraph: function(cells, opt) {\n\n        const subgraph = this.getSubgraph(cells, opt)\n        return this.cloneCells(subgraph)\n    },\n\n    // Return `cells` and all the connected links that connect cells in the `cells` array.\n    // If `opt.deep` is `true`, return all the cells including all their embedded cells\n    // and all the links that connect any of the returned cells.\n    // For example, for a single shallow element, the result is that very same element.\n    // For two elements connected with a link: `A --- L ---> B`, the result for\n    // `getSubgraph([A, B])` is `[A, L, B]`. The same goes for `getSubgraph([L])`, the result is again `[A, L, B]`.\n    getSubgraph: function(cells, opt) {\n\n        opt = opt || {}\n\n        const subgraph = []\n        // `cellMap` is used for a quick lookup of existance of a cell in the `cells` array.\n        const cellMap = {}\n        const elements = []\n        const links = []\n\n        joint.util.toArray(cells).forEach(function(cell) {\n            if (!cellMap[cell.id]) {\n                subgraph.push(cell)\n                cellMap[cell.id] = cell\n                if (cell.isLink()) {\n                    links.push(cell)\n                } else {\n                    elements.push(cell)\n                }\n            }\n\n            if (opt.deep) {\n                const embeds = cell.getEmbeddedCells({ deep: true })\n                embeds.forEach(function(embed) {\n                    if (!cellMap[embed.id]) {\n                        subgraph.push(embed)\n                        cellMap[embed.id] = embed\n                        if (embed.isLink()) {\n                            links.push(embed)\n                        } else {\n                            elements.push(embed)\n                        }\n                    }\n                })\n            }\n        })\n\n        links.forEach(function(link) {\n            // For links, return their source & target (if they are elements - not points).\n            const source = link.source()\n            const target = link.target()\n            if (source.id && !cellMap[source.id]) {\n                const sourceElement = this.getCell(source.id)\n                subgraph.push(sourceElement)\n                cellMap[sourceElement.id] = sourceElement\n                elements.push(sourceElement)\n            }\n            if (target.id && !cellMap[target.id]) {\n                const targetElement = this.getCell(target.id)\n                subgraph.push(this.getCell(target.id))\n                cellMap[targetElement.id] = targetElement\n                elements.push(targetElement)\n            }\n        }, this)\n\n        elements.forEach(function(element) {\n            // For elements, include their connected links if their source/target is in the subgraph;\n            const links = this.getConnectedLinks(element, opt)\n            links.forEach(function(link) {\n                const source = link.source()\n                const target = link.target()\n                if (!cellMap[link.id] && source.id && cellMap[source.id] && target.id && cellMap[target.id]) {\n                    subgraph.push(link)\n                    cellMap[link.id] = link\n                }\n            })\n        }, this)\n\n        return subgraph\n    },\n\n    // Find all the predecessors of `element`. This is a reverse operation of `getSuccessors()`.\n    // If `opt.deep` is `true`, take into account embedded elements too.\n    // If `opt.breadthFirst` is `true`, use the Breadth-first search algorithm, otherwise use Depth-first search.\n    getPredecessors: function(element, opt) {\n\n        opt = opt || {}\n        const res = []\n        // Modify the options so that it includes the `inbound` neighbors only. In other words, search backwards.\n        this.search(element, function(el) {\n            if (el !== element) {\n                res.push(el)\n            }\n        }, joint.util.assign({}, opt, { inbound: true }))\n        return res\n    },\n\n    // Perform search on the graph.\n    // If `opt.breadthFirst` is `true`, use the Breadth-first Search algorithm, otherwise use Depth-first search.\n    // By setting `opt.inbound` to `true`, you can reverse the direction of the search.\n    // If `opt.deep` is `true`, take into account embedded elements too.\n    // `iteratee` is a function of the form `function(element) {}`.\n    // If `iteratee` explicitely returns `false`, the searching stops.\n    search: function(element, iteratee, opt) {\n\n        opt = opt || {}\n        if (opt.breadthFirst) {\n            this.bfs(element, iteratee, opt)\n        } else {\n            this.dfs(element, iteratee, opt)\n        }\n    },\n\n    // Breadth-first search.\n    // If `opt.deep` is `true`, take into account embedded elements too.\n    // If `opt.inbound` is `true`, reverse the search direction (it's like reversing all the link directions).\n    // `iteratee` is a function of the form `function(element, distance) {}`.\n    // where `element` is the currently visited element and `distance` is the distance of that element\n    // from the root `element` passed the `bfs()`, i.e. the element we started the search from.\n    // Note that the `distance` is not the shortest or longest distance, it is simply the number of levels\n    // crossed till we visited the `element` for the first time. It is especially useful for tree graphs.\n    // If `iteratee` explicitely returns `false`, the searching stops.\n    bfs: function(element, iteratee, opt) {\n\n        opt = opt || {}\n        const visited = {}\n        const distance = {}\n        const queue = []\n\n        queue.push(element)\n        distance[element.id] = 0\n\n        while (queue.length > 0) {\n            var next = queue.shift()\n            if (!visited[next.id]) {\n                visited[next.id] = true\n                if (iteratee(next, distance[next.id]) === false) return\n                this.getNeighbors(next, opt).forEach(function(neighbor) {\n                    distance[neighbor.id] = distance[next.id] + 1\n                    queue.push(neighbor)\n                })\n            }\n        }\n    },\n\n    // Depth-first search.\n    // If `opt.deep` is `true`, take into account embedded elements too.\n    // If `opt.inbound` is `true`, reverse the search direction (it's like reversing all the link directions).\n    // `iteratee` is a function of the form `function(element, distance) {}`.\n    // If `iteratee` explicitely returns `false`, the search stops.\n    dfs: function(element, iteratee, opt, _visited, _distance) {\n\n        opt = opt || {}\n        const visited = _visited || {}\n        const distance = _distance || 0\n        if (iteratee(element, distance) === false) return\n        visited[element.id] = true\n\n        this.getNeighbors(element, opt).forEach(function(neighbor) {\n            if (!visited[neighbor.id]) {\n                this.dfs(neighbor, iteratee, opt, visited, distance + 1)\n            }\n        }, this)\n    },\n\n    // Get all the roots of the graph. Time complexity: O(|V|).\n    getSources: function() {\n\n        const sources = []\n        joint.util.forIn(this._nodes, function(exists, node) {\n            if (!this._in[node] || joint.util.isEmpty(this._in[node])) {\n                sources.push(this.getCell(node))\n            }\n        }.bind(this))\n        return sources\n    },\n\n    // Get all the leafs of the graph. Time complexity: O(|V|).\n    getSinks: function() {\n\n        const sinks = []\n        joint.util.forIn(this._nodes, function(exists, node) {\n            if (!this._out[node] || joint.util.isEmpty(this._out[node])) {\n                sinks.push(this.getCell(node))\n            }\n        }.bind(this))\n        return sinks\n    },\n\n    // Return `true` if `element` is a root. Time complexity: O(1).\n    isSource: function(element) {\n\n        return !this._in[element.id] || joint.util.isEmpty(this._in[element.id])\n    },\n\n    // Return `true` if `element` is a leaf. Time complexity: O(1).\n    isSink: function(element) {\n\n        return !this._out[element.id] || joint.util.isEmpty(this._out[element.id])\n    },\n\n    // Return `true` is `elementB` is a successor of `elementA`. Return `false` otherwise.\n    isSuccessor: function(elementA, elementB) {\n\n        let isSuccessor = false\n        this.search(elementA, function(element) {\n            if (element === elementB && element !== elementA) {\n                isSuccessor = true\n                return false\n            }\n        }, { outbound: true })\n        return isSuccessor\n    },\n\n    // Return `true` is `elementB` is a predecessor of `elementA`. Return `false` otherwise.\n    isPredecessor: function(elementA, elementB) {\n\n        let isPredecessor = false\n        this.search(elementA, function(element) {\n            if (element === elementB && element !== elementA) {\n                isPredecessor = true\n                return false\n            }\n        }, { inbound: true })\n        return isPredecessor\n    },\n\n    // Return `true` is `elementB` is a neighbor of `elementA`. Return `false` otherwise.\n    // `opt.deep` controls whether to take into account embedded elements as well. See `getNeighbors()`\n    // for more details.\n    // If `opt.outbound` is set to `true`, return `true` only if `elementB` is a successor neighbor.\n    // Similarly, if `opt.inbound` is set to `true`, return `true` only if `elementB` is a predecessor neighbor.\n    isNeighbor: function(elementA, elementB, opt) {\n\n        opt = opt || {}\n\n        let {inbound} = opt\n        let {outbound} = opt\n        if ((inbound === undefined) && (outbound === undefined)) {\n            inbound = outbound = true\n        }\n\n        let isNeighbor = false\n\n        this.getConnectedLinks(elementA, opt).forEach(function(link) {\n\n            const source = link.source()\n            const target = link.target()\n\n            // Discard if it is a point.\n            if (inbound && joint.util.has(source, 'id') && (source.id === elementB.id)) {\n                isNeighbor = true\n                return false\n            }\n\n            // Discard if it is a point, or if the neighbor was already added.\n            if (outbound && joint.util.has(target, 'id') && (target.id === elementB.id)) {\n                isNeighbor = true\n                return false\n            }\n        })\n\n        return isNeighbor\n    },\n\n    // Disconnect links connected to the cell `model`.\n    disconnectLinks: function(model, opt) {\n\n        this.getConnectedLinks(model).forEach(function(link) {\n\n            link.set((link.source().id === model.id ? 'source' : 'target'), { x: 0, y: 0 }, opt)\n        })\n    },\n\n    // Remove links connected to the cell `model` completely.\n    removeLinks: function(model, opt) {\n\n        joint.util.invoke(this.getConnectedLinks(model), 'remove', opt)\n    },\n\n    // Find all elements at given point\n    findModelsFromPoint: function(p) {\n\n        return this.getElements().filter(function(el) {\n            return el.getBBox().containsPoint(p)\n        })\n    },\n\n    // Find all elements in given area\n    findModelsInArea: function(rect, opt) {\n\n        rect = g.rect(rect)\n        opt = joint.util.defaults(opt || {}, { strict: false })\n\n        const method = opt.strict ? 'containsRect' : 'intersect'\n\n        return this.getElements().filter(function(el) {\n            return rect[method](el.getBBox())\n        })\n    },\n\n    // Find all elements under the given element.\n    findModelsUnderElement: function(element, opt) {\n\n        opt = joint.util.defaults(opt || {}, { searchBy: 'bbox' })\n\n        const bbox = element.getBBox()\n        const elements = (opt.searchBy === 'bbox')\n            ? this.findModelsInArea(bbox)\n            : this.findModelsFromPoint(bbox[opt.searchBy]())\n\n        // don't account element itself or any of its descendents\n        return elements.filter(function(el) {\n            return element.id !== el.id && !el.isEmbeddedIn(element)\n        })\n    },\n\n\n    // Return bounding box of all elements.\n    getBBox: function(cells, opt) {\n\n        return this.getCellsBBox(cells || this.getElements(), opt)\n    },\n\n    // Return the bounding box of all cells in array provided.\n    // Links are being ignored.\n    getCellsBBox: function(cells, opt) {\n\n        return joint.util.toArray(cells).reduce(function(memo, cell) {\n            if (cell.isLink()) return memo\n            if (memo) {\n                return memo.union(cell.getBBox(opt))\n            } else {\n                return cell.getBBox(opt)\n            }\n        }, null)\n    },\n\n    translate: function(dx, dy, opt) {\n\n        // Don't translate cells that are embedded in any other cell.\n        const cells = this.getCells().filter(function(cell) {\n            return !cell.isEmbedded()\n        })\n\n        joint.util.invoke(cells, 'translate', dx, dy, opt)\n\n        return this\n    },\n\n    resize: function(width, height, opt) {\n\n        return this.resizeCells(width, height, this.getCells(), opt)\n    },\n\n    resizeCells: function(width, height, cells, opt) {\n\n        // `getBBox` method returns `null` if no elements provided.\n        // i.e. cells can be an array of links\n        const bbox = this.getCellsBBox(cells)\n        if (bbox) {\n            const sx = Math.max(width / bbox.width, 0)\n            const sy = Math.max(height / bbox.height, 0)\n            joint.util.invoke(cells, 'scale', sx, sy, bbox.origin(), opt)\n        }\n\n        return this\n    },\n\n    startBatch: function(name, data) {\n\n        data = data || {}\n        this._batches[name] = (this._batches[name] || 0) + 1\n\n        return this.trigger('batch:start', joint.util.assign({}, data, { batchName: name }))\n    },\n\n    stopBatch: function(name, data) {\n\n        data = data || {}\n        this._batches[name] = (this._batches[name] || 0) - 1\n\n        return this.trigger('batch:stop', joint.util.assign({}, data, { batchName: name }))\n    },\n\n    hasActiveBatch: function(name) {\n\n        if (arguments.length === 0) {\n            return joint.util.toArray(this._batches).some(function(batches) {\n                return batches > 0\n            })\n        }\n        if (Array.isArray(name)) {\n            return name.some(function(name) {\n                return !!this._batches[name]\n            }, this)\n        }\n        return !!this._batches[name]\n    }\n\n}, {\n\n    validations: {\n\n        multiLinks: function(graph, link) {\n\n            // Do not allow multiple links to have the same source and target.\n            const source = link.source()\n            const target = link.target()\n\n            if (source.id && target.id) {\n\n                const sourceModel = link.getSourceElement()\n                if (sourceModel) {\n\n                    const connectedLinks = graph.getConnectedLinks(sourceModel, { outbound: true })\n                    const sameLinks = connectedLinks.filter(function(_link) {\n\n                        const _source = _link.source()\n                        const _target = _link.target()\n\n                        return _source && _source.id === source.id &&\n                            (!_source.port || (_source.port === source.port)) &&\n                            _target && _target.id === target.id &&\n                            (!_target.port || (_target.port === target.port))\n\n                    })\n\n                    if (sameLinks.length > 1) {\n                        return false\n                    }\n                }\n            }\n\n            return true\n        },\n\n        linkPinning: function(graph, link) {\n            return link.source().id && link.target().id\n        }\n    }\n\n})\n\njoint.util.wrapWith(joint.dia.Graph.prototype, ['resetCells', 'addCells', 'removeCells'], 'cells');\n\n(function(joint, V, g, $, util) {\n\n    function setWrapper(attrName, dimension) {\n        return function(value, refBBox) {\n            const isValuePercentage = util.isPercentage(value)\n            value = parseFloat(value)\n            if (isValuePercentage) {\n                value /= 100\n            }\n\n            const attrs = {}\n            if (isFinite(value)) {\n                const attrValue = (isValuePercentage || value >= 0 && value <= 1)\n                    ? value * refBBox[dimension]\n                    : Math.max(value + refBBox[dimension], 0)\n                attrs[attrName] = attrValue\n            }\n\n            return attrs\n        }\n    }\n\n    function positionWrapper(axis, dimension, origin) {\n        return function(value, refBBox) {\n            const valuePercentage = util.isPercentage(value)\n            value = parseFloat(value)\n            if (valuePercentage) {\n                value /= 100\n            }\n\n            let delta\n            if (isFinite(value)) {\n                const refOrigin = refBBox[origin]()\n                if (valuePercentage || value > 0 && value < 1) {\n                    delta = refOrigin[axis] + refBBox[dimension] * value\n                } else {\n                    delta = refOrigin[axis] + value\n                }\n            }\n\n            const point = g.Point()\n            point[axis] = delta || 0\n            return point\n        }\n    }\n\n    function offsetWrapper(axis, dimension, corner) {\n        return function(value, nodeBBox) {\n            let delta\n            if (value === 'middle') {\n                delta = nodeBBox[dimension] / 2\n            } else if (value === corner) {\n                delta = nodeBBox[dimension]\n            } else if (isFinite(value)) {\n                // TODO: or not to do a breaking change?\n                delta = (value > -1 && value < 1) ? (-nodeBBox[dimension] * value) : -value\n            } else if (util.isPercentage(value)) {\n                delta = nodeBBox[dimension] * parseFloat(value) / 100\n            } else {\n                delta = 0\n            }\n\n            const point = g.Point()\n            point[axis] = -(nodeBBox[axis] + delta)\n            return point\n        }\n    }\n\n    function shapeWrapper(shapeConstructor, opt) {\n        const cacheName = 'joint-shape'\n        const resetOffset = opt && opt.resetOffset\n        return function(value, refBBox, node) {\n            const $node = $(node)\n            let cache = $node.data(cacheName)\n            if (!cache || cache.value !== value) {\n                // only recalculate if value has changed\n                const cachedShape = shapeConstructor(value)\n                cache = {\n                    value: value,\n                    shape: cachedShape,\n                    shapeBBox: cachedShape.bbox()\n                }\n                $node.data(cacheName, cache)\n            }\n\n            const shape = cache.shape.clone()\n            const shapeBBox = cache.shapeBBox.clone()\n            const shapeOrigin = shapeBBox.origin()\n            const refOrigin = refBBox.origin()\n\n            shapeBBox.x = refOrigin.x\n            shapeBBox.y = refOrigin.y\n\n            const fitScale = refBBox.maxRectScaleToFit(shapeBBox, refOrigin)\n            // `maxRectScaleToFit` can give Infinity if width or height is 0\n            const sx = (shapeBBox.width === 0 || refBBox.width === 0) ? 1 : fitScale.sx\n            const sy = (shapeBBox.height === 0 || refBBox.height === 0) ? 1 : fitScale.sy\n\n            shape.scale(sx, sy, shapeOrigin)\n            if (resetOffset) {\n                shape.translate(-shapeOrigin.x, -shapeOrigin.y)\n            }\n\n            return shape\n        }\n    }\n\n    // `d` attribute for SVGPaths\n    function dWrapper(opt) {\n        function pathConstructor(value) {\n            return new g.Path(V.normalizePathData(value))\n        }\n        const shape = shapeWrapper(pathConstructor, opt)\n        return function(value, refBBox, node) {\n            const path = shape(value, refBBox, node)\n            return {\n                d: path.serialize()\n            }\n        }\n    }\n\n    // `points` attribute for SVGPolylines and SVGPolygons\n    function pointsWrapper(opt) {\n        const shape = shapeWrapper(g.Polyline, opt)\n        return function(value, refBBox, node) {\n            const polyline = shape(value, refBBox, node)\n            return {\n                points: polyline.serialize()\n            }\n        }\n    }\n\n    function atConnectionWrapper(method, opt) {\n        const zeroVector = new g.Point(1, 0)\n        return function(value) {\n            let p; let angle\n            const tangent = this[method](value)\n            if (tangent) {\n                angle = (opt.rotate) ? tangent.vector().vectorAngle(zeroVector) : 0\n                p = tangent.start\n            } else {\n                p = this.path.start\n                angle = 0\n            }\n            if (angle === 0) return { transform: `translate(${  p.x  },${  p.y  })` }\n            return { transform: `translate(${  p.x  },${  p.y  }) rotate(${  angle  })` }\n        }\n    }\n\n    function isTextInUse(lineHeight, node, attrs) {\n        return (attrs.text !== undefined)\n    }\n\n    function isLinkView() {\n        return this instanceof joint.dia.LinkView\n    }\n\n    function contextMarker(context) {\n        const marker = {}\n        // Stroke\n        // The context 'fill' is disregared here. The usual case is to use the marker with a connection\n        // (for which 'fill' attribute is set to 'none').\n        const {stroke} = context\n        if (typeof stroke === 'string') {\n            marker.stroke = stroke\n            marker.fill = stroke\n        }\n        // Opacity\n        // Again the context 'fill-opacity' is ignored.\n        let {strokeOpacity} = context\n        if (strokeOpacity === undefined) strokeOpacity = context['stroke-opacity']\n        if (strokeOpacity === undefined) strokeOpacity = context.opacity\n        if (strokeOpacity !== undefined) {\n            marker['stroke-opacity'] = strokeOpacity\n            marker['fill-opacity'] = strokeOpacity\n        }\n        return marker\n    }\n\n    const attributesNS = joint.dia.attributes = {\n\n        xlinkHref: {\n            set: 'xlink:href'\n        },\n\n        xlinkShow: {\n            set: 'xlink:show'\n        },\n\n        xlinkRole: {\n            set: 'xlink:role'\n        },\n\n        xlinkType: {\n            set: 'xlink:type'\n        },\n\n        xlinkArcrole: {\n            set: 'xlink:arcrole'\n        },\n\n        xlinkTitle: {\n            set: 'xlink:title'\n        },\n\n        xlinkActuate: {\n            set: 'xlink:actuate'\n        },\n\n        xmlSpace: {\n            set: 'xml:space'\n        },\n\n        xmlBase: {\n            set: 'xml:base'\n        },\n\n        xmlLang: {\n            set: 'xml:lang'\n        },\n\n        preserveAspectRatio: {\n            set: 'preserveAspectRatio'\n        },\n\n        requiredExtension: {\n            set: 'requiredExtension'\n        },\n\n        requiredFeatures: {\n            set: 'requiredFeatures'\n        },\n\n        systemLanguage: {\n            set: 'systemLanguage'\n        },\n\n        externalResourcesRequired: {\n            set: 'externalResourceRequired'\n        },\n\n        filter: {\n            qualify: util.isPlainObject,\n            set: function(filter) {\n                return `url(#${  this.paper.defineFilter(filter)  })`\n            }\n        },\n\n        fill: {\n            qualify: util.isPlainObject,\n            set: function(fill) {\n                return `url(#${  this.paper.defineGradient(fill)  })`\n            }\n        },\n\n        stroke: {\n            qualify: util.isPlainObject,\n            set: function(stroke) {\n                return `url(#${  this.paper.defineGradient(stroke)  })`\n            }\n        },\n\n        sourceMarker: {\n            qualify: util.isPlainObject,\n            set: function(marker, refBBox, node, attrs) {\n                marker = util.assign(contextMarker(attrs), marker)\n                return { 'marker-start': `url(#${  this.paper.defineMarker(marker)  })` }\n            }\n        },\n\n        targetMarker: {\n            qualify: util.isPlainObject,\n            set: function(marker, refBBox, node, attrs) {\n                marker = util.assign(contextMarker(attrs), { transform: 'rotate(180)' }, marker)\n                return { 'marker-end': `url(#${  this.paper.defineMarker(marker)  })` }\n            }\n        },\n\n        vertexMarker: {\n            qualify: util.isPlainObject,\n            set: function(marker, refBBox, node, attrs) {\n                marker = util.assign(contextMarker(attrs), marker)\n                return { 'marker-mid': `url(#${  this.paper.defineMarker(marker)  })` }\n            }\n        },\n\n        text: {\n            qualify: function(text, node, attrs) {\n                return !attrs.textWrap || !util.isPlainObject(attrs.textWrap)\n            },\n            set: function(text, refBBox, node, attrs) {\n                const $node = $(node)\n                const cacheName = 'joint-text'\n                const cache = $node.data(cacheName)\n                const textAttrs = joint.util.pick(attrs, 'lineHeight', 'annotations', 'textPath', 'x', 'textVerticalAnchor', 'eol')\n                const fontSize = textAttrs.fontSize = attrs['font-size'] || attrs.fontSize\n                const textHash = JSON.stringify([text, textAttrs])\n                // Update the text only if there was a change in the string\n                // or any of its attributes.\n                if (cache === undefined || cache !== textHash) {\n                    // Chrome bug:\n                    // Tspans positions defined as `em` are not updated\n                    // when container `font-size` change.\n                    if (fontSize) node.setAttribute('font-size', fontSize)\n                    // Text Along Path Selector\n                    const {textPath} = textAttrs\n                    if (util.isObject(textPath)) {\n                        const pathSelector = textPath.selector\n                        if (typeof pathSelector === 'string') {\n                            const pathNode = this.findBySelector(pathSelector)[0]\n                            if (pathNode instanceof SVGPathElement) {\n                                textAttrs.textPath = util.assign({ 'xlink:href': `#${  pathNode.id}` }, textPath)\n                            }\n                        }\n                    }\n                    V(node).text(`${  text}`, textAttrs)\n                    $node.data(cacheName, textHash)\n                }\n            }\n        },\n\n        textWrap: {\n            qualify: util.isPlainObject,\n            set: function(value, refBBox, node, attrs) {\n                // option `width`\n                const width = value.width || 0\n                if (util.isPercentage(width)) {\n                    refBBox.width *= parseFloat(width) / 100\n                } else if (width <= 0) {\n                    refBBox.width += width\n                } else {\n                    refBBox.width = width\n                }\n                // option `height`\n                const height = value.height || 0\n                if (util.isPercentage(height)) {\n                    refBBox.height *= parseFloat(height) / 100\n                } else if (height <= 0) {\n                    refBBox.height += height\n                } else {\n                    refBBox.height = height\n                }\n                // option `text`\n                let wrappedText\n                let {text} = value\n                if (text === undefined) text = attrs.text\n                if (text !== undefined) {\n                    wrappedText = joint.util.breakText(`${  text}`, refBBox, {\n                        'font-weight': attrs['font-weight'] || attrs.fontWeight,\n                        'font-size': attrs['font-size'] || attrs.fontSize,\n                        'font-family': attrs['font-family'] || attrs.fontFamily,\n                        lineHeight: attrs.lineHeight\n                    }, {\n                        // Provide an existing SVG Document here\n                        // instead of creating a temporary one over again.\n                        svgDocument: this.paper.svg\n                    })\n                } else {\n                    wrappedText = ''\n                }\n                joint.dia.attributes.text.set.call(this, wrappedText, refBBox, node, attrs)\n            }\n        },\n\n        title: {\n            qualify: function(title, node) {\n                // HTMLElement title is specified via an attribute (i.e. not an element)\n                return node instanceof SVGElement\n            },\n            set: function(title, refBBox, node) {\n                const $node = $(node)\n                const cacheName = 'joint-title'\n                const cache = $node.data(cacheName)\n                if (cache === undefined || cache !== title) {\n                    $node.data(cacheName, title)\n                    // Generally <title> element should be the first child element of its parent.\n                    const {firstChild} = node\n                    if (firstChild && firstChild.tagName.toUpperCase() === 'TITLE') {\n                        // Update an existing title\n                        firstChild.textContent = title\n                    } else {\n                        // Create a new title\n                        const titleNode = document.createElementNS(node.namespaceURI, 'title')\n                        titleNode.textContent = title\n                        node.insertBefore(titleNode, firstChild)\n                    }\n                }\n            }\n        },\n\n        lineHeight: {\n            qualify: isTextInUse\n        },\n\n        textVerticalAnchor: {\n            qualify: isTextInUse\n        },\n\n        textPath: {\n            qualify: isTextInUse\n        },\n\n        annotations: {\n            qualify: isTextInUse\n        },\n\n        // `port` attribute contains the `id` of the port that the underlying magnet represents.\n        port: {\n            set: function(port) {\n                return (port === null || port.id === undefined) ? port : port.id\n            }\n        },\n\n        // `style` attribute is special in the sense that it sets the CSS style of the subelement.\n        style: {\n            qualify: util.isPlainObject,\n            set: function(styles, refBBox, node) {\n                $(node).css(styles)\n            }\n        },\n\n        html: {\n            set: function(html, refBBox, node) {\n                $(node).html(`${html  }`)\n            }\n        },\n\n        ref: {\n            // We do not set `ref` attribute directly on an element.\n            // The attribute itself does not qualify for relative positioning.\n        },\n\n        // if `refX` is in [0, 1] then `refX` is a fraction of bounding box width\n        // if `refX` is < 0 then `refX`'s absolute values is the right coordinate of the bounding box\n        // otherwise, `refX` is the left coordinate of the bounding box\n\n        refX: {\n            position: positionWrapper('x', 'width', 'origin')\n        },\n\n        refY: {\n            position: positionWrapper('y', 'height', 'origin')\n        },\n\n        // `ref-dx` and `ref-dy` define the offset of the subelement relative to the right and/or bottom\n        // coordinate of the reference element.\n\n        refDx: {\n            position: positionWrapper('x', 'width', 'corner')\n        },\n\n        refDy: {\n            position: positionWrapper('y', 'height', 'corner')\n        },\n\n        // 'ref-width'/'ref-height' defines the width/height of the subelement relatively to\n        // the reference element size\n        // val in 0..1         ref-width = 0.75 sets the width to 75% of the ref. el. width\n        // val < 0 || val > 1  ref-height = -20 sets the height to the the ref. el. height shorter by 20\n\n        refWidth: {\n            set: setWrapper('width', 'width')\n        },\n\n        refHeight: {\n            set: setWrapper('height', 'height')\n        },\n\n        refRx: {\n            set: setWrapper('rx', 'width')\n        },\n\n        refRy: {\n            set: setWrapper('ry', 'height')\n        },\n\n        refRInscribed: {\n            set: (function(attrName) {\n                const widthFn = setWrapper(attrName, 'width')\n                const heightFn = setWrapper(attrName, 'height')\n                return function(value, refBBox) {\n                    const fn = (refBBox.height > refBBox.width) ? widthFn : heightFn\n                    return fn(value, refBBox)\n                }\n            })('r')\n        },\n\n        refRCircumscribed: {\n            set: function(value, refBBox) {\n                const isValuePercentage = util.isPercentage(value)\n                value = parseFloat(value)\n                if (isValuePercentage) {\n                    value /= 100\n                }\n\n                const diagonalLength = Math.sqrt((refBBox.height * refBBox.height) + (refBBox.width * refBBox.width))\n\n                let rValue\n                if (isFinite(value)) {\n                    if (isValuePercentage || value >= 0 && value <= 1) rValue = value * diagonalLength\n                    else rValue = Math.max(value + diagonalLength, 0)\n                }\n\n                return { r: rValue }\n            }\n        },\n\n        refCx: {\n            set: setWrapper('cx', 'width')\n        },\n\n        refCy: {\n            set: setWrapper('cy', 'height')\n        },\n\n        // `x-alignment` when set to `middle` causes centering of the subelement around its new x coordinate.\n        // `x-alignment` when set to `right` uses the x coordinate as referenced to the right of the bbox.\n\n        xAlignment: {\n            offset: offsetWrapper('x', 'width', 'right')\n        },\n\n        // `y-alignment` when set to `middle` causes centering of the subelement around its new y coordinate.\n        // `y-alignment` when set to `bottom` uses the y coordinate as referenced to the bottom of the bbox.\n\n        yAlignment: {\n            offset: offsetWrapper('y', 'height', 'bottom')\n        },\n\n        resetOffset: {\n            offset: function(val, nodeBBox) {\n                return (val)\n                    ? { x: -nodeBBox.x, y: -nodeBBox.y }\n                    : { x: 0, y: 0 }\n            }\n\n        },\n\n        refDResetOffset: {\n            set: dWrapper({ resetOffset: true })\n        },\n\n        refDKeepOffset: {\n            set: dWrapper({ resetOffset: false })\n        },\n\n        refPointsResetOffset: {\n            set: pointsWrapper({ resetOffset: true })\n        },\n\n        refPointsKeepOffset: {\n            set: pointsWrapper({ resetOffset: false })\n        },\n\n        // LinkView Attributes\n\n        connection: {\n            qualify: isLinkView,\n            set: function() {\n                return { d: this.getSerializedConnection() }\n            }\n        },\n\n        atConnectionLengthKeepGradient: {\n            qualify: isLinkView,\n            set: atConnectionWrapper('getTangentAtLength', { rotate: true })\n        },\n\n        atConnectionLengthIgnoreGradient: {\n            qualify: isLinkView,\n            set: atConnectionWrapper('getTangentAtLength', { rotate: false })\n        },\n\n        atConnectionRatioKeepGradient: {\n            qualify: isLinkView,\n            set: atConnectionWrapper('getTangentAtRatio', { rotate: true })\n        },\n\n        atConnectionRatioIgnoreGradient: {\n            qualify: isLinkView,\n            set: atConnectionWrapper('getTangentAtRatio', { rotate: false })\n        }\n    }\n\n    // Aliases\n    attributesNS.refR = attributesNS.refRInscribed\n    attributesNS.refD = attributesNS.refDResetOffset\n    attributesNS.refPoints = attributesNS.refPointsResetOffset\n    attributesNS.atConnectionLength = attributesNS.atConnectionLengthKeepGradient\n    attributesNS.atConnectionRatio = attributesNS.atConnectionRatioKeepGradient\n\n    // This allows to combine both absolute and relative positioning\n    // refX: 50%, refX2: 20\n    attributesNS.refX2 = attributesNS.refX\n    attributesNS.refY2 = attributesNS.refY\n\n    // Aliases for backwards compatibility\n    attributesNS['ref-x'] = attributesNS.refX\n    attributesNS['ref-y'] = attributesNS.refY\n    attributesNS['ref-dy'] = attributesNS.refDy\n    attributesNS['ref-dx'] = attributesNS.refDx\n    attributesNS['ref-width'] = attributesNS.refWidth\n    attributesNS['ref-height'] = attributesNS.refHeight\n    attributesNS['x-alignment'] = attributesNS.xAlignment\n    attributesNS['y-alignment'] = attributesNS.yAlignment\n\n})(joint, V, g, $, joint.util);\n\n(function(joint, util) {\n\n    const ToolView = joint.mvc.View.extend({\n        name: null,\n        tagName: 'g',\n        className: 'tool',\n        svgElement: true,\n        _visible: true,\n\n        init: function() {\n            const {name} = this\n            if (name) this.vel.attr('data-tool-name', name)\n        },\n\n        configure: function(view, toolsView) {\n            this.relatedView = view\n            this.paper = view.paper\n            this.parentView = toolsView\n            this.simulateRelatedView(this.el)\n            return this\n        },\n\n        simulateRelatedView: function(el) {\n            if (el) el.setAttribute('model-id', this.relatedView.model.id)\n        },\n\n        getName: function() {\n            return this.name\n        },\n\n        show: function() {\n            this.el.style.display = ''\n            this._visible = true\n        },\n\n        hide: function() {\n            this.el.style.display = 'none'\n            this._visible = false\n        },\n\n        isVisible: function() {\n            return !!this._visible\n        },\n\n        focus: function() {\n            const opacity = this.options.focusOpacity\n            if (isFinite(opacity)) this.el.style.opacity = opacity\n            this.parentView.focusTool(this)\n        },\n\n        blur: function() {\n            this.el.style.opacity = ''\n            this.parentView.blurTool(this)\n        },\n\n        update: function() {\n            // to be overriden\n        }\n    })\n\n    const ToolsView = joint.mvc.View.extend({\n        tagName: 'g',\n        className: 'tools',\n        svgElement: true,\n        tools: null,\n        options: {\n            tools: null,\n            relatedView: null,\n            name: null,\n            component: false\n        },\n\n        configure: function(options) {\n            options = util.assign(this.options, options)\n            const {tools} = options\n            if (!Array.isArray(tools)) return this\n            const {relatedView} = options\n            if (!(relatedView instanceof joint.dia.CellView)) return this\n            const views = this.tools = []\n            for (let i = 0, n = tools.length; i < n; i++) {\n                const tool = tools[i]\n                if (!(tool instanceof ToolView)) continue\n                tool.configure(relatedView, this)\n                tool.render()\n                this.vel.append(tool.el)\n                views.push(tool)\n            }\n            return this\n        },\n\n        getName: function() {\n            return this.options.name\n        },\n\n        update: function(opt) {\n\n            opt || (opt = {})\n            const {tools} = this\n            if (!tools) return\n            for (let i = 0, n = tools.length; i < n; i++) {\n                const tool = tools[i]\n                if (opt.tool !== tool.cid && tool.isVisible()) {\n                    tool.update()\n                }\n            }\n            return this\n        },\n\n        focusTool: function(focusedTool) {\n\n            const {tools} = this\n            if (!tools) return this\n            for (let i = 0, n = tools.length; i < n; i++) {\n                const tool = tools[i]\n                if (focusedTool === tool) {\n                    tool.show()\n                } else {\n                    tool.hide()\n                }\n            }\n            return this\n        },\n\n        blurTool: function(blurredTool) {\n            const {tools} = this\n            if (!tools) return this\n            for (let i = 0, n = tools.length; i < n; i++) {\n                const tool = tools[i]\n                if (tool !== blurredTool && !tool.isVisible()) {\n                    tool.show()\n                    tool.update()\n                }\n            }\n            return this\n        },\n\n        hide: function() {\n            return this.focusTool(null)\n        },\n\n        show: function() {\n            return this.blurTool(null)\n        },\n\n        onRemove: function() {\n\n            const {tools} = this\n            if (!tools) return this\n            for (let i = 0, n = tools.length; i < n; i++) {\n                tools[i].remove()\n            }\n            this.tools = null\n        },\n\n        mount: function() {\n            const {options} = this\n            const {relatedView} = options\n            if (relatedView) {\n                const container = (options.component) ? relatedView.el : relatedView.paper.tools\n                container.appendChild(this.el)\n            }\n            return this\n        }\n\n    })\n\n    joint.dia.ToolsView = ToolsView\n    joint.dia.ToolView = ToolView\n\n})(joint, joint.util)\n\n\n// joint.dia.Cell base model.\n// --------------------------\n\njoint.dia.Cell = Backbone.Model.extend({\n\n    // This is the same as Backbone.Model with the only difference that is uses joint.util.merge\n    // instead of just _.extend. The reason is that we want to mixin attributes set in upper classes.\n    constructor: function(attributes, options) {\n\n        let defaults\n        let attrs = attributes || {}\n        this.cid = joint.util.uniqueId('c')\n        this.attributes = {}\n        if (options && options.collection) this.collection = options.collection\n        if (options && options.parse) attrs = this.parse(attrs, options) || {}\n        if ((defaults = joint.util.result(this, 'defaults'))) {\n            //<custom code>\n            // Replaced the call to _.defaults with joint.util.merge.\n            attrs = joint.util.merge({}, defaults, attrs)\n            //</custom code>\n        }\n        this.set(attrs, options)\n        this.changed = {}\n        this.initialize.apply(this, arguments)\n    },\n\n    translate: function(dx, dy, opt) {\n\n        throw new Error('Must define a translate() method.')\n    },\n\n    toJSON: function() {\n\n        const defaultAttrs = this.constructor.prototype.defaults.attrs || {}\n        const {attrs} = this.attributes\n        const finalAttrs = {}\n\n        // Loop through all the attributes and\n        // omit the default attributes as they are implicitly reconstructable by the cell 'type'.\n        joint.util.forIn(attrs, function(attr, selector) {\n\n            const defaultAttr = defaultAttrs[selector]\n\n            joint.util.forIn(attr, function(value, name) {\n\n                // attr is mainly flat though it might have one more level (consider the `style` attribute).\n                // Check if the `value` is object and if yes, go one level deep.\n                if (joint.util.isObject(value) && !Array.isArray(value)) {\n\n                    joint.util.forIn(value, function(value2, name2) {\n\n                        if (!defaultAttr || !defaultAttr[name] || !joint.util.isEqual(defaultAttr[name][name2], value2)) {\n\n                            finalAttrs[selector] = finalAttrs[selector] || {};\n                            (finalAttrs[selector][name] || (finalAttrs[selector][name] = {}))[name2] = value2\n                        }\n                    })\n\n                } else if (!defaultAttr || !joint.util.isEqual(defaultAttr[name], value)) {\n                    // `value` is not an object, default attribute for such a selector does not exist\n                    // or it is different than the attribute value set on the model.\n\n                    finalAttrs[selector] = finalAttrs[selector] || {}\n                    finalAttrs[selector][name] = value\n                }\n            })\n        })\n\n        const attributes = joint.util.cloneDeep(joint.util.omit(this.attributes, 'attrs'))\n        //var attributes = JSON.parse(JSON.stringify(_.omit(this.attributes, 'attrs')));\n        attributes.attrs = finalAttrs\n\n        return attributes\n    },\n\n    initialize: function(options) {\n\n        if (!options || !options.id) {\n\n            this.set('id', joint.util.uuid(), { silent: true })\n        }\n\n        this._transitionIds = {}\n\n        // Collect ports defined in `attrs` and keep collecting whenever `attrs` object changes.\n        this.processPorts()\n        this.on('change:attrs', this.processPorts, this)\n    },\n\n    /**\n     * @deprecated\n     */\n    processPorts: function() {\n\n        // Whenever `attrs` changes, we extract ports from the `attrs` object and store it\n        // in a more accessible way. Also, if any port got removed and there were links that had `target`/`source`\n        // set to that port, we remove those links as well (to follow the same behaviour as\n        // with a removed element).\n\n        const previousPorts = this.ports\n\n        // Collect ports from the `attrs` object.\n        const ports = {}\n        joint.util.forIn(this.get('attrs'), function(attrs, selector) {\n\n            if (attrs && attrs.port) {\n\n                // `port` can either be directly an `id` or an object containing an `id` (and potentially other data).\n                if (attrs.port.id !== undefined) {\n                    ports[attrs.port.id] = attrs.port\n                } else {\n                    ports[attrs.port] = { id: attrs.port }\n                }\n            }\n        })\n\n        // Collect ports that have been removed (compared to the previous ports) - if any.\n        // Use hash table for quick lookup.\n        const removedPorts = {}\n        joint.util.forIn(previousPorts, function(port, id) {\n\n            if (!ports[id]) removedPorts[id] = true\n        })\n\n        // Remove all the incoming/outgoing links that have source/target port set to any of the removed ports.\n        if (this.graph && !joint.util.isEmpty(removedPorts)) {\n\n            const inboundLinks = this.graph.getConnectedLinks(this, { inbound: true })\n            inboundLinks.forEach(function(link) {\n\n                if (removedPorts[link.get('target').port]) link.remove()\n            })\n\n            const outboundLinks = this.graph.getConnectedLinks(this, { outbound: true })\n            outboundLinks.forEach(function(link) {\n\n                if (removedPorts[link.get('source').port]) link.remove()\n            })\n        }\n\n        // Update the `ports` object.\n        this.ports = ports\n    },\n\n    remove: function(opt) {\n\n        opt = opt || {}\n\n        // Store the graph in a variable because `this.graph` won't' be accessbile after `this.trigger('remove', ...)` down below.\n        const {graph} = this\n        if (graph) {\n            graph.startBatch('remove')\n        }\n\n        // First, unembed this cell from its parent cell if there is one.\n        const parentCell = this.getParentCell()\n        if (parentCell) parentCell.unembed(this)\n\n        joint.util.invoke(this.getEmbeddedCells(), 'remove', opt)\n\n        this.trigger('remove', this, this.collection, opt)\n\n        if (graph) {\n            graph.stopBatch('remove')\n        }\n\n        return this\n    },\n\n    toFront: function(opt) {\n\n        const {graph} = this\n        if (graph) {\n\n            opt = opt || {}\n\n            let z = graph.maxZIndex()\n\n            let cells\n\n            if (opt.deep) {\n                cells = this.getEmbeddedCells({ deep: true, breadthFirst: true })\n                cells.unshift(this)\n            } else {\n                cells = [this]\n            }\n\n            z = z - cells.length + 1\n\n            const collection = graph.get('cells')\n            let shouldUpdate = (collection.indexOf(this) !== (collection.length - cells.length))\n            if (!shouldUpdate) {\n                shouldUpdate = cells.some(function(cell, index) {\n                    return cell.get('z') !== z + index\n                })\n            }\n\n            if (shouldUpdate) {\n                this.startBatch('to-front')\n\n                z += cells.length\n\n                cells.forEach(function(cell, index) {\n                    cell.set('z', z + index, opt)\n                })\n\n                this.stopBatch('to-front')\n            }\n        }\n\n        return this\n    },\n\n    toBack: function(opt) {\n\n        const {graph} = this\n        if (graph) {\n\n            opt = opt || {}\n\n            let z = graph.minZIndex()\n\n            let cells\n\n            if (opt.deep) {\n                cells = this.getEmbeddedCells({ deep: true, breadthFirst: true })\n                cells.unshift(this)\n            } else {\n                cells = [this]\n            }\n\n            const collection = graph.get('cells')\n            let shouldUpdate = (collection.indexOf(this) !== 0)\n            if (!shouldUpdate) {\n                shouldUpdate = cells.some(function(cell, index) {\n                    return cell.get('z') !== z + index\n                })\n            }\n\n            if (shouldUpdate) {\n                this.startBatch('to-back')\n\n                z -= cells.length\n\n                cells.forEach(function(cell, index) {\n                    cell.set('z', z + index, opt)\n                })\n\n                this.stopBatch('to-back')\n            }\n        }\n\n        return this\n    },\n\n    parent: function(parent, opt) {\n\n        // getter\n        if (parent === undefined) return this.get('parent')\n        // setter\n        return this.set('parent', parent, opt)\n    },\n\n    embed: function(cell, opt) {\n\n        if (this === cell || this.isEmbeddedIn(cell)) {\n\n            throw new Error('Recursive embedding not allowed.')\n\n        } else {\n\n            this.startBatch('embed')\n\n            const embeds = joint.util.assign([], this.get('embeds'))\n\n            // We keep all element ids after link ids.\n            embeds[cell.isLink() ? 'unshift' : 'push'](cell.id)\n\n            cell.parent(this.id, opt)\n            this.set('embeds', joint.util.uniq(embeds), opt)\n\n            this.stopBatch('embed')\n        }\n\n        return this\n    },\n\n    unembed: function(cell, opt) {\n\n        this.startBatch('unembed')\n\n        cell.unset('parent', opt)\n        this.set('embeds', joint.util.without(this.get('embeds'), cell.id), opt)\n\n        this.stopBatch('unembed')\n\n        return this\n    },\n\n    getParentCell: function() {\n\n        // unlike link.source/target, cell.parent stores id directly as a string\n        const parentId = this.parent()\n        const {graph} = this\n\n        return (parentId && graph && graph.getCell(parentId)) || null\n    },\n\n    // Return an array of ancestor cells.\n    // The array is ordered from the parent of the cell\n    // to the most distant ancestor.\n    getAncestors: function() {\n\n        const ancestors = []\n\n        if (!this.graph) {\n            return ancestors\n        }\n\n        let parentCell = this.getParentCell()\n        while (parentCell) {\n            ancestors.push(parentCell)\n            parentCell = parentCell.getParentCell()\n        }\n\n        return ancestors\n    },\n\n    getEmbeddedCells: function(opt) {\n\n        opt = opt || {}\n\n        // Cell models can only be retrieved when this element is part of a collection.\n        // There is no way this element knows about other cells otherwise.\n        // This also means that calling e.g. `translate()` on an element with embeds before\n        // adding it to a graph does not translate its embeds.\n        if (this.graph) {\n\n            let cells\n\n            if (opt.deep) {\n\n                if (opt.breadthFirst) {\n\n                    // breadthFirst algorithm\n                    cells = []\n                    const queue = this.getEmbeddedCells()\n\n                    while (queue.length > 0) {\n\n                        const parent = queue.shift()\n                        cells.push(parent)\n                        queue.push.apply(queue, parent.getEmbeddedCells())\n                    }\n\n                } else {\n\n                    // depthFirst algorithm\n                    cells = this.getEmbeddedCells()\n                    cells.forEach(function(cell) {\n                        cells.push.apply(cells, cell.getEmbeddedCells(opt))\n                    })\n                }\n\n            } else {\n\n                cells = joint.util.toArray(this.get('embeds')).map(this.graph.getCell, this.graph)\n            }\n\n            return cells\n        }\n        return []\n    },\n\n    isEmbeddedIn: function(cell, opt) {\n\n        const cellId = joint.util.isString(cell) ? cell : cell.id\n        let parentId = this.parent()\n\n        opt = joint.util.defaults({ deep: true }, opt)\n\n        // See getEmbeddedCells().\n        if (this.graph && opt.deep) {\n\n            while (parentId) {\n                if (parentId === cellId) {\n                    return true\n                }\n                parentId = this.graph.getCell(parentId).parent()\n            }\n\n            return false\n\n        } else {\n\n            // When this cell is not part of a collection check\n            // at least whether it's a direct child of given cell.\n            return parentId === cellId\n        }\n    },\n\n    // Whether or not the cell is embedded in any other cell.\n    isEmbedded: function() {\n\n        return !!this.parent()\n    },\n\n    // Isolated cloning. Isolated cloning has two versions: shallow and deep (pass `{ deep: true }` in `opt`).\n    // Shallow cloning simply clones the cell and returns a new cell with different ID.\n    // Deep cloning clones the cell and all its embedded cells recursively.\n    clone: function(opt) {\n\n        opt = opt || {}\n\n        if (!opt.deep) {\n            // Shallow cloning.\n\n            const clone = Backbone.Model.prototype.clone.apply(this, arguments)\n            // We don't want the clone to have the same ID as the original.\n            clone.set('id', joint.util.uuid())\n            // A shallow cloned element does not carry over the original embeds.\n            clone.unset('embeds')\n            // And can not be embedded in any cell\n            // as the clone is not part of the graph.\n            clone.unset('parent')\n\n            return clone\n\n        } else {\n            // Deep cloning.\n\n            // For a deep clone, simply call `graph.cloneCells()` with the cell and all its embedded cells.\n            return joint.util.toArray(joint.dia.Graph.prototype.cloneCells.call(null, [this].concat(this.getEmbeddedCells({ deep: true }))))\n        }\n    },\n\n    // A convenient way to set nested properties.\n    // This method merges the properties you'd like to set with the ones\n    // stored in the cell and makes sure change events are properly triggered.\n    // You can either set a nested property with one object\n    // or use a property path.\n    // The most simple use case is:\n    // `cell.prop('name/first', 'John')` or\n    // `cell.prop({ name: { first: 'John' } })`.\n    // Nested arrays are supported too:\n    // `cell.prop('series/0/data/0/degree', 50)` or\n    // `cell.prop({ series: [ { data: [ { degree: 50 } ] } ] })`.\n    prop: function(props, value, opt) {\n\n        const delim = '/'\n        const isString = joint.util.isString(props)\n\n        if (isString || Array.isArray(props)) {\n            // Get/set an attribute by a special path syntax that delimits\n            // nested objects by the colon character.\n\n            if (arguments.length > 1) {\n\n                let path\n                let pathArray\n\n                if (isString) {\n                    path = props\n                    pathArray = path.split('/')\n                } else {\n                    path = props.join(delim)\n                    pathArray = props.slice()\n                }\n\n                const property = pathArray[0]\n                const pathArrayLength = pathArray.length\n\n                opt = opt || {}\n                opt.propertyPath = path\n                opt.propertyValue = value\n                opt.propertyPathArray = pathArray\n\n                if (pathArrayLength === 1) {\n                    // Property is not nested. We can simply use `set()`.\n                    return this.set(property, value, opt)\n                }\n\n                let update = {}\n                // Initialize the nested object. Subobjects are either arrays or objects.\n                // An empty array is created if the sub-key is an integer. Otherwise, an empty object is created.\n                // Note that this imposes a limitation on object keys one can use with Inspector.\n                // Pure integer keys will cause issues and are therefore not allowed.\n                let initializer = update\n                let prevProperty = property\n\n                for (let i = 1; i < pathArrayLength; i++) {\n                    const pathItem = pathArray[i]\n                    const isArrayIndex = Number.isFinite(isString ? Number(pathItem) : pathItem)\n                    initializer = initializer[prevProperty] = isArrayIndex ? [] : {}\n                    prevProperty = pathItem\n                }\n\n                // Fill update with the `value` on `path`.\n                update = joint.util.setByPath(update, pathArray, value, '/')\n\n                const baseAttributes = joint.util.merge({}, this.attributes)\n                // if rewrite mode enabled, we replace value referenced by path with\n                // the new one (we don't merge).\n                opt.rewrite && joint.util.unsetByPath(baseAttributes, path, '/')\n\n                // Merge update with the model attributes.\n                const attributes = joint.util.merge(baseAttributes, update)\n                // Finally, set the property to the updated attributes.\n                return this.set(property, attributes[property], opt)\n\n            } else {\n\n                return joint.util.getByPath(this.attributes, props, delim)\n            }\n        }\n\n        return this.set(joint.util.merge({}, this.attributes, props), value)\n    },\n\n    // A convient way to unset nested properties\n    removeProp: function(path, opt) {\n\n        // Once a property is removed from the `attrs` attribute\n        // the cellView will recognize a `dirty` flag and rerender itself\n        // in order to remove the attribute from SVG element.\n        opt = opt || {}\n        opt.dirty = true\n\n        const pathArray = Array.isArray(path) ? path : path.split('/')\n\n        if (pathArray.length === 1) {\n            // A top level property\n            return this.unset(path, opt)\n        }\n\n        // A nested property\n        const property = pathArray[0]\n        const nestedPath = pathArray.slice(1)\n        const propertyValue = joint.util.cloneDeep(this.get(property))\n\n        joint.util.unsetByPath(propertyValue, nestedPath, '/')\n\n        return this.set(property, propertyValue, opt)\n    },\n\n    // A convenient way to set nested attributes.\n    attr: function(attrs, value, opt) {\n\n        const args = Array.from(arguments)\n        if (args.length === 0) {\n            return this.get('attrs')\n        }\n\n        if (Array.isArray(attrs)) {\n            args[0] = ['attrs'].concat(attrs)\n        } else if (joint.util.isString(attrs)) {\n            // Get/set an attribute by a special path syntax that delimits\n            // nested objects by the colon character.\n            args[0] = `attrs/${  attrs}`\n\n        } else {\n\n            args[0] = { attrs: attrs }\n        }\n\n        return this.prop.apply(this, args)\n    },\n\n    // A convenient way to unset nested attributes\n    removeAttr: function(path, opt) {\n\n        if (Array.isArray(path)) {\n\n            return this.removeProp(['attrs'].concat(path))\n        }\n\n        return this.removeProp(`attrs/${  path}`, opt)\n    },\n\n    transition: function(path, value, opt, delim) {\n\n        delim = delim || '/'\n\n        const defaults = {\n            duration: 100,\n            delay: 10,\n            timingFunction: joint.util.timing.linear,\n            valueFunction: joint.util.interpolate.number\n        }\n\n        opt = joint.util.assign(defaults, opt)\n\n        let firstFrameTime = 0\n        let interpolatingFunction\n\n        var setter = function(runtime) {\n\n            let id; let progress; let propertyValue\n\n            firstFrameTime = firstFrameTime || runtime\n            runtime -= firstFrameTime\n            progress = runtime / opt.duration\n\n            if (progress < 1) {\n                this._transitionIds[path] = id = joint.util.nextFrame(setter)\n            } else {\n                progress = 1\n                delete this._transitionIds[path]\n            }\n\n            propertyValue = interpolatingFunction(opt.timingFunction(progress))\n\n            opt.transitionId = id\n\n            this.prop(path, propertyValue, opt)\n\n            if (!id) this.trigger('transition:end', this, path)\n\n        }.bind(this)\n\n        const initiator = function(callback) {\n\n            this.stopTransitions(path)\n\n            interpolatingFunction = opt.valueFunction(joint.util.getByPath(this.attributes, path, delim), value)\n\n            this._transitionIds[path] = joint.util.nextFrame(callback)\n\n            this.trigger('transition:start', this, path)\n\n        }.bind(this)\n\n        return setTimeout(initiator, opt.delay, setter)\n    },\n\n    getTransitions: function() {\n\n        return Object.keys(this._transitionIds)\n    },\n\n    stopTransitions: function(path, delim) {\n\n        delim = delim || '/'\n\n        const pathArray = path && path.split(delim)\n\n        Object.keys(this._transitionIds).filter(pathArray && function(key) {\n\n            return joint.util.isEqual(pathArray, key.split(delim).slice(0, pathArray.length))\n\n        }).forEach(function(key) {\n\n            joint.util.cancelFrame(this._transitionIds[key])\n\n            delete this._transitionIds[key]\n\n            this.trigger('transition:end', this, key)\n\n        }, this)\n\n        return this\n    },\n\n    // A shorcut making it easy to create constructs like the following:\n    // `var el = (new joint.shapes.basic.Rect).addTo(graph)`.\n    addTo: function(graph, opt) {\n\n        graph.addCell(this, opt)\n        return this\n    },\n\n    // A shortcut for an equivalent call: `paper.findViewByModel(cell)`\n    // making it easy to create constructs like the following:\n    // `cell.findView(paper).highlight()`\n    findView: function(paper) {\n\n        return paper.findViewByModel(this)\n    },\n\n    isElement: function() {\n\n        return false\n    },\n\n    isLink: function() {\n\n        return false\n    },\n\n    startBatch: function(name, opt) {\n\n        if (this.graph) { this.graph.startBatch(name, joint.util.assign({}, opt, { cell: this })) }\n        return this\n    },\n\n    stopBatch: function(name, opt) {\n\n        if (this.graph) { this.graph.stopBatch(name, joint.util.assign({}, opt, { cell: this })) }\n        return this\n    }\n\n}, {\n\n    getAttributeDefinition: function(attrName) {\n\n        const defNS = this.attributes\n        const globalDefNS = joint.dia.attributes\n        return (defNS && defNS[attrName]) || globalDefNS[attrName]\n    },\n\n    define: function(type, defaults, protoProps, staticProps) {\n\n        protoProps = joint.util.assign({\n            defaults: joint.util.defaultsDeep({ type: type }, defaults, this.prototype.defaults)\n        }, protoProps)\n\n        const Cell = this.extend(protoProps, staticProps)\n        joint.util.setByPath(joint.shapes, type, Cell, '.')\n        return Cell\n    }\n})\n\n// joint.dia.CellView base view and controller.\n// --------------------------------------------\n\n// This is the base view and controller for `joint.dia.ElementView` and `joint.dia.LinkView`.\n\njoint.dia.CellView = joint.mvc.View.extend({\n\n    tagName: 'g',\n\n    svgElement: true,\n\n    selector: 'root',\n\n    className: function() {\n\n        const classNames = ['cell']\n        const type = this.model.get('type')\n\n        if (type) {\n\n            type.toLowerCase().split('.').forEach(function(value, index, list) {\n                classNames.push(`type-${  list.slice(0, index + 1).join('-')}`)\n            })\n        }\n\n        return classNames.join(' ')\n    },\n\n    attributes: function() {\n\n        return { 'model-id': this.model.id }\n    },\n\n    constructor: function(options) {\n\n        // Make sure a global unique id is assigned to this view. Store this id also to the properties object.\n        // The global unique id makes sure that the same view can be rendered on e.g. different machines and\n        // still be associated to the same object among all those clients. This is necessary for real-time\n        // collaboration mechanism.\n        options.id = options.id || joint.util.guid(this)\n\n        joint.mvc.View.call(this, options)\n    },\n\n    init: function() {\n\n        joint.util.bindAll(this, 'remove', 'update')\n\n        // Store reference to this to the <g> DOM element so that the view is accessible through the DOM tree.\n        this.$el.data('view', this)\n\n        // Add the cell's type to the view's element as a data attribute.\n        this.$el.attr('data-type', this.model.get('type'))\n\n        this.listenTo(this.model, 'change:attrs', this.onChangeAttrs)\n    },\n\n    onChangeAttrs: function(cell, attrs, opt) {\n\n        if (opt.dirty) {\n\n            // dirty flag could be set when a model attribute was removed and it needs to be cleared\n            // also from the DOM element. See cell.removeAttr().\n            return this.render()\n        }\n\n        return this.update(cell, attrs, opt)\n    },\n\n    // Return `true` if cell link is allowed to perform a certain UI `feature`.\n    // Example: `can('vertexMove')`, `can('labelMove')`.\n    can: function(feature) {\n\n        const interactive = joint.util.isFunction(this.options.interactive)\n            ? this.options.interactive(this)\n            : this.options.interactive\n\n        return (joint.util.isObject(interactive) && interactive[feature] !== false) ||\n                (joint.util.isBoolean(interactive) && interactive !== false)\n    },\n\n    findBySelector: function(selector, root, selectors) {\n\n        root || (root = this.el)\n        selectors || (selectors = this.selectors)\n\n        // These are either descendants of `this.$el` of `this.$el` itself.\n        // `.` is a special selector used to select the wrapping `<g>` element.\n        if (!selector || selector === '.') return [root]\n        if (selectors && selectors[selector]) return [selectors[selector]]\n        // Maintaining backwards compatibility\n        // e.g. `circle:first` would fail with querySelector() call\n        return $(root).find(selector).toArray()\n    },\n\n    notify: function(eventName) {\n\n        if (this.paper) {\n\n            const args = Array.prototype.slice.call(arguments, 1)\n\n            // Trigger the event on both the element itself and also on the paper.\n            this.trigger.apply(this, [eventName].concat(args))\n\n            // Paper event handlers receive the view object as the first argument.\n            this.paper.trigger.apply(this.paper, [eventName, this].concat(args))\n        }\n    },\n\n    // ** Deprecated **\n    getStrokeBBox: function(el) {\n        // Return a bounding box rectangle that takes into account stroke.\n        // Note that this is a naive and ad-hoc implementation that does not\n        // works only in certain cases and should be replaced as soon as browsers will\n        // start supporting the getStrokeBBox() SVG method.\n        // @TODO any better solution is very welcome!\n\n        const isMagnet = !!el\n\n        el = el || this.el\n        const bbox = V(el).getBBox({ target: this.paper.viewport })\n        let strokeWidth\n        if (isMagnet) {\n\n            strokeWidth = V(el).attr('stroke-width')\n\n        } else {\n\n            strokeWidth = this.model.attr('rect/stroke-width') || this.model.attr('circle/stroke-width') || this.model.attr('ellipse/stroke-width') || this.model.attr('path/stroke-width')\n        }\n\n        strokeWidth = parseFloat(strokeWidth) || 0\n\n        return g.rect(bbox).moveAndExpand({ x: -strokeWidth / 2, y: -strokeWidth / 2, width: strokeWidth, height: strokeWidth })\n    },\n\n    getBBox: function() {\n\n        return this.vel.getBBox({ target: this.paper.svg })\n    },\n\n    highlight: function(el, opt) {\n\n        el = !el ? this.el : this.$(el)[0] || this.el\n\n        // set partial flag if the highlighted element is not the entire view.\n        opt = opt || {}\n        opt.partial = (el !== this.el)\n\n        this.notify('cell:highlight', el, opt)\n        return this\n    },\n\n    unhighlight: function(el, opt) {\n\n        el = !el ? this.el : this.$(el)[0] || this.el\n\n        opt = opt || {}\n        opt.partial = el != this.el\n\n        this.notify('cell:unhighlight', el, opt)\n        return this\n    },\n\n    // Find the closest element that has the `magnet` attribute set to `true`. If there was not such\n    // an element found, return the root element of the cell view.\n    findMagnet: function(el) {\n\n        let $el = this.$(el)\n        const $rootEl = this.$el\n\n        if ($el.length === 0) {\n            $el = $rootEl\n        }\n\n        do {\n\n            const magnet = $el.attr('magnet')\n            if ((magnet || $el.is($rootEl)) && magnet !== 'false') {\n                return $el[0]\n            }\n\n            $el = $el.parent()\n\n        } while ($el.length > 0)\n\n        // If the overall cell has set `magnet === false`, then return `undefined` to\n        // announce there is no magnet found for this cell.\n        // This is especially useful to set on cells that have 'ports'. In this case,\n        // only the ports have set `magnet === true` and the overall element has `magnet === false`.\n        return undefined\n    },\n\n    // Construct a unique selector for the `el` element within this view.\n    // `prevSelector` is being collected through the recursive call.\n    // No value for `prevSelector` is expected when using this method.\n    getSelector: function(el, prevSelector) {\n\n        let selector\n\n        if (el === this.el) {\n            if (typeof prevSelector === 'string') selector = `> ${  prevSelector}`\n            return selector\n        }\n\n        if (el) {\n\n            const nthChild = V(el).index() + 1\n            selector = `${el.tagName  }:nth-child(${  nthChild  })`\n\n            if (prevSelector) {\n                selector += ` > ${  prevSelector}`\n            }\n\n            selector = this.getSelector(el.parentNode, selector)\n        }\n\n        return selector\n    },\n\n    getLinkEnd: function(magnet, x, y, link, endType) {\n\n        const {model} = this\n        const {id} = model\n        const port = this.findAttribute('port', magnet)\n        // Find a unique `selector` of the element under pointer that is a magnet.\n        const selector = magnet.getAttribute('joint-selector')\n\n        let end = { id: id }\n        if (selector != null) end.magnet = selector\n        if (port != null) {\n            end.port = port\n            if (!model.hasPort(port) && !selector) {\n                // port created via the `port` attribute (not API)\n                end.selector = this.getSelector(magnet)\n            }\n        } else if (selector == null && this.el !== magnet) {\n            end.selector = this.getSelector(magnet)\n        }\n\n        const {paper} = this\n        const {connectionStrategy} = paper.options\n        if (typeof connectionStrategy === 'function') {\n            const strategy = connectionStrategy.call(paper, end, this, magnet, new g.Point(x, y), link, endType)\n            if (strategy) end = strategy\n        }\n\n        return end\n    },\n\n    getMagnetFromLinkEnd: function(end) {\n\n        const root = this.el\n        const {port} = end\n        let selector = end.magnet\n        let magnet\n        if (port != null && this.model.hasPort(port)) {\n            magnet = this.findPortNode(port, selector) || root\n        } else {\n            if (!selector) selector = end.selector\n            if (!selector && port != null) {\n                // link end has only `id` and `port` property referencing\n                // a port created via the `port` attribute (not API).\n                selector = `[port=\"${  port  }\"]`\n            }\n            magnet = this.findBySelector(selector, root, this.selectors)[0]\n        }\n\n        return magnet\n    },\n\n    findAttribute: function(attributeName, node) {\n\n        if (!node) return null\n\n        let attributeValue = node.getAttribute(attributeName)\n        if (attributeValue === null) {\n            if (node === this.el) return null\n            let currentNode = node.parentNode\n            while (currentNode && currentNode !== this.el && currentNode.nodeType === 1) {\n                attributeValue = currentNode.getAttribute(attributeName)\n                if (attributeValue !== null) break\n                currentNode = currentNode.parentNode\n            }\n        }\n        return attributeValue\n    },\n\n    getAttributeDefinition: function(attrName) {\n\n        return this.model.constructor.getAttributeDefinition(attrName)\n    },\n\n    setNodeAttributes: function(node, attrs) {\n\n        if (!joint.util.isEmpty(attrs)) {\n            if (node instanceof SVGElement) {\n                V(node).attr(attrs)\n            } else {\n                $(node).attr(attrs)\n            }\n        }\n    },\n\n    processNodeAttributes: function(node, attrs) {\n\n        let attrName; let attrVal; let def; let i; let n\n        let normalAttrs; let setAttrs; let positionAttrs; let offsetAttrs\n        const relatives = []\n        // divide the attributes between normal and special\n        for (attrName in attrs) {\n            if (!attrs.hasOwnProperty(attrName)) continue\n            attrVal = attrs[attrName]\n            def = this.getAttributeDefinition(attrName)\n            if (def && (!joint.util.isFunction(def.qualify) || def.qualify.call(this, attrVal, node, attrs))) {\n                if (joint.util.isString(def.set)) {\n                    normalAttrs || (normalAttrs = {})\n                    normalAttrs[def.set] = attrVal\n                }\n                if (attrVal !== null) {\n                    relatives.push(attrName, def)\n                }\n            } else {\n                normalAttrs || (normalAttrs = {})\n                normalAttrs[joint.util.toKebabCase(attrName)] = attrVal\n            }\n        }\n\n        // handle the rest of attributes via related method\n        // from the special attributes namespace.\n        for (i = 0, n = relatives.length; i < n; i+=2) {\n            attrName = relatives[i]\n            def = relatives[i+1]\n            attrVal = attrs[attrName]\n            if (joint.util.isFunction(def.set)) {\n                setAttrs || (setAttrs = {})\n                setAttrs[attrName] = attrVal\n            }\n            if (joint.util.isFunction(def.position)) {\n                positionAttrs || (positionAttrs = {})\n                positionAttrs[attrName] = attrVal\n            }\n            if (joint.util.isFunction(def.offset)) {\n                offsetAttrs || (offsetAttrs = {})\n                offsetAttrs[attrName] = attrVal\n            }\n        }\n\n        return {\n            raw: attrs,\n            normal: normalAttrs,\n            set: setAttrs,\n            position: positionAttrs,\n            offset: offsetAttrs\n        }\n    },\n\n    updateRelativeAttributes: function(node, attrs, refBBox, opt) {\n\n        opt || (opt = {})\n\n        let attrName; let attrVal; let def\n        const rawAttrs = attrs.raw || {}\n        let nodeAttrs = attrs.normal || {}\n        const setAttrs = attrs.set\n        const positionAttrs = attrs.position\n        const offsetAttrs = attrs.offset\n\n        for (attrName in setAttrs) {\n            attrVal = setAttrs[attrName]\n            def = this.getAttributeDefinition(attrName)\n            // SET - set function should return attributes to be set on the node,\n            // which will affect the node dimensions based on the reference bounding\n            // box. e.g. `width`, `height`, `d`, `rx`, `ry`, `points\n            const setResult = def.set.call(this, attrVal, refBBox.clone(), node, rawAttrs)\n            if (joint.util.isObject(setResult)) {\n                joint.util.assign(nodeAttrs, setResult)\n            } else if (setResult !== undefined) {\n                nodeAttrs[attrName] = setResult\n            }\n        }\n\n        if (node instanceof HTMLElement) {\n            // TODO: setting the `transform` attribute on HTMLElements\n            // via `node.style.transform = 'matrix(...)';` would introduce\n            // a breaking change (e.g. basic.TextBlock).\n            this.setNodeAttributes(node, nodeAttrs)\n            return\n        }\n\n        // The final translation of the subelement.\n        const nodeTransform = nodeAttrs.transform\n        const nodeMatrix = V.transformStringToMatrix(nodeTransform)\n        const nodePosition = g.Point(nodeMatrix.e, nodeMatrix.f)\n        if (nodeTransform) {\n            nodeAttrs = joint.util.omit(nodeAttrs, 'transform')\n            nodeMatrix.e = nodeMatrix.f = 0\n        }\n\n        // Calculate node scale determined by the scalable group\n        // only if later needed.\n        let sx; let sy; let translation\n        if (positionAttrs || offsetAttrs) {\n            const nodeScale = this.getNodeScale(node, opt.scalableNode)\n            sx = nodeScale.sx\n            sy = nodeScale.sy\n        }\n\n        let positioned = false\n        for (attrName in positionAttrs) {\n            attrVal = positionAttrs[attrName]\n            def = this.getAttributeDefinition(attrName)\n            // POSITION - position function should return a point from the\n            // reference bounding box. The default position of the node is x:0, y:0 of\n            // the reference bounding box or could be further specify by some\n            // SVG attributes e.g. `x`, `y`\n            translation = def.position.call(this, attrVal, refBBox.clone(), node, rawAttrs)\n            if (translation) {\n                nodePosition.offset(g.Point(translation).scale(sx, sy))\n                positioned || (positioned = true)\n            }\n        }\n\n        // The node bounding box could depend on the `size` set from the previous loop.\n        // Here we know, that all the size attributes have been already set.\n        this.setNodeAttributes(node, nodeAttrs)\n\n        let offseted = false\n        if (offsetAttrs) {\n            // Check if the node is visible\n            const nodeClientRect = node.getBoundingClientRect()\n            if (nodeClientRect.width > 0 && nodeClientRect.height > 0) {\n                const nodeBBox = V.transformRect(node.getBBox(), nodeMatrix).scale(1 / sx, 1 / sy)\n                for (attrName in offsetAttrs) {\n                    attrVal = offsetAttrs[attrName]\n                    def = this.getAttributeDefinition(attrName)\n                    // OFFSET - offset function should return a point from the element\n                    // bounding box. The default offset point is x:0, y:0 (origin) or could be further\n                    // specify with some SVG attributes e.g. `text-anchor`, `cx`, `cy`\n                    translation = def.offset.call(this, attrVal, nodeBBox, node, rawAttrs)\n                    if (translation) {\n                        nodePosition.offset(g.Point(translation).scale(sx, sy))\n                        offseted || (offseted = true)\n                    }\n                }\n            }\n        }\n\n        // Do not touch node's transform attribute if there is no transformation applied.\n        if (nodeTransform !== undefined || positioned || offseted) {\n            // Round the coordinates to 1 decimal point.\n            nodePosition.round(1)\n            nodeMatrix.e = nodePosition.x\n            nodeMatrix.f = nodePosition.y\n            node.setAttribute('transform', V.matrixToTransformString(nodeMatrix))\n            // TODO: store nodeMatrix metrics?\n        }\n    },\n\n    getNodeScale: function(node, scalableNode) {\n\n        // Check if the node is a descendant of the scalable group.\n        let sx; let sy\n        if (scalableNode && scalableNode.contains(node)) {\n            const scale = scalableNode.scale()\n            sx = 1 / scale.sx\n            sy = 1 / scale.sy\n        } else {\n            sx = 1\n            sy = 1\n        }\n\n        return { sx: sx, sy: sy }\n    },\n\n    findNodesAttributes: function(attrs, root, selectorCache, selectors) {\n\n        // TODO: merge attributes in order defined by `index` property\n\n        // most browsers sort elements in attrs by order of addition\n        // which is useful but not required\n\n        // link.updateLabels() relies on that assumption for merging label attrs over default label attrs\n\n        const nodesAttrs = {}\n\n        for (const selector in attrs) {\n            if (!attrs.hasOwnProperty(selector)) continue\n            const selected = selectorCache[selector] = this.findBySelector(selector, root, selectors)\n            for (let i = 0, n = selected.length; i < n; i++) {\n                const node = selected[i]\n                const nodeId = V.ensureId(node)\n                const nodeAttrs = attrs[selector]\n                const prevNodeAttrs = nodesAttrs[nodeId]\n                if (prevNodeAttrs) {\n                    if (!prevNodeAttrs.merged) {\n                        prevNodeAttrs.merged = true\n                        // if prevNode attrs is `null`, replace with `{}`\n                        prevNodeAttrs.attributes = joint.util.cloneDeep(prevNodeAttrs.attributes) || {}\n                    }\n                    // if prevNode attrs not set (or `null` or`{}`), use node attrs\n                    // if node attrs not set (or `null` or `{}`), use prevNode attrs\n                    joint.util.merge(prevNodeAttrs.attributes, nodeAttrs)\n                } else {\n                    nodesAttrs[nodeId] = {\n                        attributes: nodeAttrs,\n                        node: node,\n                        merged: false\n                    }\n                }\n            }\n        }\n\n        return nodesAttrs\n    },\n\n    // Default is to process the `model.attributes.attrs` object and set attributes on subelements based on the selectors,\n    // unless `attrs` parameter was passed.\n    updateDOMSubtreeAttributes: function(rootNode, attrs, opt) {\n\n        opt || (opt = {})\n        opt.rootBBox || (opt.rootBBox = g.Rect())\n        opt.selectors || (opt.selectors = this.selectors) // selector collection to use\n\n        // Cache table for query results and bounding box calculation.\n        // Note that `selectorCache` needs to be invalidated for all\n        // `updateAttributes` calls, as the selectors might pointing\n        // to nodes designated by an attribute or elements dynamically\n        // created.\n        const selectorCache = {}\n        const bboxCache = {}\n        const relativeItems = []\n        let item; let node; let nodeAttrs; let nodeData; let processedAttrs\n\n        const roAttrs = opt.roAttributes\n        const nodesAttrs = this.findNodesAttributes(roAttrs || attrs, rootNode, selectorCache, opt.selectors)\n        // `nodesAttrs` are different from all attributes, when\n        // rendering only  attributes sent to this method.\n        var nodesAllAttrs = (roAttrs)\n            ? nodesAllAttrs = this.findNodesAttributes(attrs, rootNode, selectorCache, opt.selectors)\n            : nodesAttrs\n\n        for (const nodeId in nodesAttrs) {\n            nodeData = nodesAttrs[nodeId]\n            nodeAttrs = nodeData.attributes\n            node = nodeData.node\n            processedAttrs = this.processNodeAttributes(node, nodeAttrs)\n\n            if (!processedAttrs.set && !processedAttrs.position && !processedAttrs.offset) {\n                // Set all the normal attributes right on the SVG/HTML element.\n                this.setNodeAttributes(node, processedAttrs.normal)\n\n            } else {\n\n                const nodeAllAttrs = nodesAllAttrs[nodeId] && nodesAllAttrs[nodeId].attributes\n                const refSelector = (nodeAllAttrs && (nodeAttrs.ref === undefined))\n                    ? nodeAllAttrs.ref\n                    : nodeAttrs.ref\n\n                var refNode\n                if (refSelector) {\n                    refNode = (selectorCache[refSelector] || this.findBySelector(refSelector, rootNode, opt.selectors))[0]\n                    if (!refNode) {\n                        throw new Error(`dia.ElementView: \"${  refSelector  }\" reference does not exist.`)\n                    }\n                } else {\n                    refNode = null\n                }\n\n                item = {\n                    node: node,\n                    refNode: refNode,\n                    processedAttributes: processedAttrs,\n                    allAttributes: nodeAllAttrs\n                }\n\n                // If an element in the list is positioned relative to this one, then\n                // we want to insert this one before it in the list.\n                const itemIndex = relativeItems.findIndex(function(item) {\n                    return item.refNode === node\n                })\n\n                if (itemIndex > -1) {\n                    relativeItems.splice(itemIndex, 0, item)\n                } else {\n                    relativeItems.push(item)\n                }\n            }\n        }\n\n        for (let i = 0, n = relativeItems.length; i < n; i++) {\n            item = relativeItems[i]\n            node = item.node\n            refNode = item.refNode\n\n            // Find the reference element bounding box. If no reference was provided, we\n            // use the optional bounding box.\n            const refNodeId = refNode ? V.ensureId(refNode) : ''\n            let refBBox = bboxCache[refNodeId]\n            if (!refBBox) {\n                // Get the bounding box of the reference element relative to the `rotatable` `<g>` (without rotation)\n                // or to the root `<g>` element if no rotatable group present if reference node present.\n                // Uses the bounding box provided.\n                refBBox = bboxCache[refNodeId] = (refNode)\n                    ? V(refNode).getBBox({ target: (opt.rotatableNode || rootNode) })\n                    : opt.rootBBox\n            }\n\n            if (roAttrs) {\n                // if there was a special attribute affecting the position amongst passed-in attributes\n                // we have to merge it with the rest of the element's attributes as they are necessary\n                // to update the position relatively (i.e `ref-x` && 'ref-dx')\n                processedAttrs = this.processNodeAttributes(node, item.allAttributes)\n                this.mergeProcessedAttributes(processedAttrs, item.processedAttributes)\n\n            } else {\n                processedAttrs = item.processedAttributes\n            }\n\n            this.updateRelativeAttributes(node, processedAttrs, refBBox, opt)\n        }\n    },\n\n    mergeProcessedAttributes: function(processedAttrs, roProcessedAttrs) {\n\n        processedAttrs.set || (processedAttrs.set = {})\n        processedAttrs.position || (processedAttrs.position = {})\n        processedAttrs.offset || (processedAttrs.offset = {})\n\n        joint.util.assign(processedAttrs.set, roProcessedAttrs.set)\n        joint.util.assign(processedAttrs.position, roProcessedAttrs.position)\n        joint.util.assign(processedAttrs.offset, roProcessedAttrs.offset)\n\n        // Handle also the special transform property.\n        const transform = processedAttrs.normal && processedAttrs.normal.transform\n        if (transform !== undefined && roProcessedAttrs.normal) {\n            roProcessedAttrs.normal.transform = transform\n        }\n        processedAttrs.normal = roProcessedAttrs.normal\n    },\n\n    onRemove: function() {\n        this.removeTools()\n    },\n\n    _toolsView: null,\n\n    hasTools: function(name) {\n        const toolsView = this._toolsView\n        if (!toolsView) return false\n        if (!name) return true\n        return (toolsView.getName() === name)\n    },\n\n    addTools: function(toolsView) {\n\n        this.removeTools()\n\n        if (toolsView instanceof joint.dia.ToolsView) {\n            this._toolsView = toolsView\n            toolsView.configure({ relatedView: this })\n            toolsView.listenTo(this.paper, 'tools:event', this.onToolEvent.bind(this))\n            toolsView.mount()\n        }\n        return this\n    },\n\n    updateTools: function(opt) {\n\n        const toolsView = this._toolsView\n        if (toolsView) toolsView.update(opt)\n        return this\n    },\n\n    removeTools: function() {\n\n        const toolsView = this._toolsView\n        if (toolsView) {\n            toolsView.remove()\n            this._toolsView = null\n        }\n        return this\n    },\n\n    hideTools: function() {\n\n        const toolsView = this._toolsView\n        if (toolsView) toolsView.hide()\n        return this\n    },\n\n    showTools: function() {\n\n        const toolsView = this._toolsView\n        if (toolsView) toolsView.show()\n        return this\n    },\n\n    onToolEvent: function(event) {\n        switch (event) {\n            case 'remove':\n                this.removeTools()\n                break\n            case 'hide':\n                this.hideTools()\n                break\n            case 'show':\n                this.showTools()\n                break\n        }\n    },\n\n    // Interaction. The controller part.\n    // ---------------------------------\n\n    // Interaction is handled by the paper and delegated to the view in interest.\n    // `x` & `y` parameters passed to these functions represent the coordinates already snapped to the paper grid.\n    // If necessary, real coordinates can be obtained from the `evt` event object.\n\n    // These functions are supposed to be overriden by the views that inherit from `joint.dia.Cell`,\n    // i.e. `joint.dia.Element` and `joint.dia.Link`.\n\n    pointerdblclick: function(evt, x, y) {\n\n        this.notify('cell:pointerdblclick', evt, x, y)\n    },\n\n    pointerclick: function(evt, x, y) {\n\n        this.notify('cell:pointerclick', evt, x, y)\n    },\n\n    contextmenu: function(evt, x, y) {\n\n        this.notify('cell:contextmenu', evt, x, y)\n    },\n\n    pointerdown: function(evt, x, y) {\n\n        if (this.model.graph) {\n            this.model.startBatch('pointer')\n            this._graph = this.model.graph\n        }\n\n        this.notify('cell:pointerdown', evt, x, y)\n    },\n\n    pointermove: function(evt, x, y) {\n\n        this.notify('cell:pointermove', evt, x, y)\n    },\n\n    pointerup: function(evt, x, y) {\n\n        this.notify('cell:pointerup', evt, x, y)\n\n        if (this._graph) {\n            // we don't want to trigger event on model as model doesn't\n            // need to be member of collection anymore (remove)\n            this._graph.stopBatch('pointer', { cell: this.model })\n            delete this._graph\n        }\n    },\n\n    mouseover: function(evt) {\n\n        this.notify('cell:mouseover', evt)\n    },\n\n    mouseout: function(evt) {\n\n        this.notify('cell:mouseout', evt)\n    },\n\n    mouseenter: function(evt) {\n\n        this.notify('cell:mouseenter', evt)\n    },\n\n    mouseleave: function(evt) {\n\n        this.notify('cell:mouseleave', evt)\n    },\n\n    mousewheel: function(evt, x, y, delta) {\n\n        this.notify('cell:mousewheel', evt, x, y, delta)\n    },\n\n    onevent: function(evt, eventName, x, y) {\n\n        this.notify(eventName, evt, x, y)\n    },\n\n    onmagnet: function() {\n\n        // noop\n    },\n\n    setInteractivity: function(value) {\n\n        this.options.interactive = value\n    }\n}, {\n\n    dispatchToolsEvent: function(paper, event) {\n        if ((typeof event === 'string') && (paper instanceof joint.dia.Paper)) {\n            paper.trigger('tools:event', event)\n        }\n    }\n})\n\n\n// joint.dia.Element base model.\n// -----------------------------\n\njoint.dia.Element = joint.dia.Cell.extend({\n\n    defaults: {\n        position: { x: 0, y: 0 },\n        size: { width: 1, height: 1 },\n        angle: 0\n    },\n\n    initialize: function() {\n\n        this._initializePorts()\n        joint.dia.Cell.prototype.initialize.apply(this, arguments)\n    },\n\n    /**\n     * @abstract\n     */\n    _initializePorts: function() {\n        // implemented in ports.js\n    },\n\n    isElement: function() {\n\n        return true\n    },\n\n    position: function(x, y, opt) {\n\n        const isSetter = joint.util.isNumber(y)\n\n        opt = (isSetter ? opt : x) || {}\n\n        // option `parentRelative` for setting the position relative to the element's parent.\n        if (opt.parentRelative) {\n\n            // Getting the parent's position requires the collection.\n            // Cell.parent() holds cell id only.\n            if (!this.graph) throw new Error('Element must be part of a graph.')\n\n            const parent = this.getParentCell()\n            var parentPosition = parent && !parent.isLink()\n                ? parent.get('position')\n                : { x: 0, y: 0 }\n        }\n\n        if (isSetter) {\n\n            if (opt.parentRelative) {\n                x += parentPosition.x\n                y += parentPosition.y\n            }\n\n            if (opt.deep) {\n                const currentPosition = this.get('position')\n                this.translate(x - currentPosition.x, y - currentPosition.y, opt)\n            } else {\n                this.set('position', { x: x, y: y }, opt)\n            }\n\n            return this\n\n        } else { // Getter returns a geometry point.\n\n            const elementPosition = g.point(this.get('position'))\n\n            return opt.parentRelative\n                ? elementPosition.difference(parentPosition)\n                : elementPosition\n        }\n    },\n\n    translate: function(tx, ty, opt) {\n\n        tx = tx || 0\n        ty = ty || 0\n\n        if (tx === 0 && ty === 0) {\n            // Like nothing has happened.\n            return this\n        }\n\n        opt = opt || {}\n        // Pass the initiator of the translation.\n        opt.translateBy = opt.translateBy || this.id\n\n        const position = this.get('position') || { x: 0, y: 0 }\n\n        if (opt.restrictedArea && opt.translateBy === this.id) {\n\n            // We are restricting the translation for the element itself only. We get\n            // the bounding box of the element including all its embeds.\n            // All embeds have to be translated the exact same way as the element.\n            const bbox = this.getBBox({ deep: true })\n            const ra = opt.restrictedArea\n            //- - - - - - - - - - - - -> ra.x + ra.width\n            // - - - -> position.x      |\n            // -> bbox.x\n            //                ▓▓▓▓▓▓▓   |\n            //         ░░░░░░░▓▓▓▓▓▓▓\n            //         ░░░░░░░░░        |\n            //   ▓▓▓▓▓▓▓▓░░░░░░░\n            //   ▓▓▓▓▓▓▓▓               |\n            //   <-dx->                     | restricted area right border\n            //         <-width->        |   ░ translated element\n            //   <- - bbox.width - ->       ▓ embedded element\n            const dx = position.x - bbox.x\n            const dy = position.y - bbox.y\n            // Find the maximal/minimal coordinates that the element can be translated\n            // while complies the restrictions.\n            const x = Math.max(ra.x + dx, Math.min(ra.x + ra.width + dx - bbox.width, position.x + tx))\n            const y = Math.max(ra.y + dy, Math.min(ra.y + ra.height + dy - bbox.height, position.y + ty))\n            // recalculate the translation taking the resctrictions into account.\n            tx = x - position.x\n            ty = y - position.y\n        }\n\n        const translatedPosition = {\n            x: position.x + tx,\n            y: position.y + ty\n        }\n\n        // To find out by how much an element was translated in event 'change:position' handlers.\n        opt.tx = tx\n        opt.ty = ty\n\n        if (opt.transition) {\n\n            if (!joint.util.isObject(opt.transition)) opt.transition = {}\n\n            this.transition('position', translatedPosition, joint.util.assign({}, opt.transition, {\n                valueFunction: joint.util.interpolate.object\n            }))\n\n        } else {\n\n            this.set('position', translatedPosition, opt)\n        }\n\n        // Recursively call `translate()` on all the embeds cells.\n        joint.util.invoke(this.getEmbeddedCells(), 'translate', tx, ty, opt)\n\n        return this\n    },\n\n    size: function(width, height, opt) {\n\n        const currentSize = this.get('size')\n        // Getter\n        // () signature\n        if (width === undefined) {\n            return {\n                width: currentSize.width,\n                height: currentSize.height\n            }\n        }\n        // Setter\n        // (size, opt) signature\n        if (joint.util.isObject(width)) {\n            opt = height\n            height = joint.util.isNumber(width.height) ? width.height : currentSize.height\n            width = joint.util.isNumber(width.width) ? width.width : currentSize.width\n        }\n\n        return this.resize(width, height, opt)\n    },\n\n    resize: function(width, height, opt) {\n\n        opt = opt || {}\n\n        this.startBatch('resize', opt)\n\n        if (opt.direction) {\n\n            const currentSize = this.get('size')\n\n            switch (opt.direction) {\n\n                case 'left':\n                case 'right':\n                    // Don't change height when resizing horizontally.\n                    height = currentSize.height\n                    break\n\n                case 'top':\n                case 'bottom':\n                    // Don't change width when resizing vertically.\n                    width = currentSize.width\n                    break\n            }\n\n            // Get the angle and clamp its value between 0 and 360 degrees.\n            const angle = g.normalizeAngle(this.get('angle') || 0)\n\n            let quadrant = {\n                'top-right': 0,\n                right: 0,\n                'top-left': 1,\n                top: 1,\n                'bottom-left': 2,\n                left: 2,\n                'bottom-right': 3,\n                bottom: 3\n            }[opt.direction]\n\n            if (opt.absolute) {\n\n                // We are taking the element's rotation into account\n                quadrant += Math.floor((angle + 45) / 90)\n                quadrant %= 4\n            }\n\n            // This is a rectangle in size of the unrotated element.\n            const bbox = this.getBBox()\n\n            // Pick the corner point on the element, which meant to stay on its place before and\n            // after the rotation.\n            const fixedPoint = bbox[['bottomLeft', 'corner', 'topRight', 'origin'][quadrant]]()\n\n            // Find  an image of the previous indent point. This is the position, where is the\n            // point actually located on the screen.\n            const imageFixedPoint = g.point(fixedPoint).rotate(bbox.center(), -angle)\n\n            // Every point on the element rotates around a circle with the centre of rotation\n            // in the middle of the element while the whole element is being rotated. That means\n            // that the distance from a point in the corner of the element (supposed its always rect) to\n            // the center of the element doesn't change during the rotation and therefore it equals\n            // to a distance on unrotated element.\n            // We can find the distance as DISTANCE = (ELEMENTWIDTH/2)^2 + (ELEMENTHEIGHT/2)^2)^0.5.\n            const radius = Math.sqrt((width * width) + (height * height)) / 2\n\n            // Now we are looking for an angle between x-axis and the line starting at image of fixed point\n            // and ending at the center of the element. We call this angle `alpha`.\n\n            // The image of a fixed point is located in n-th quadrant. For each quadrant passed\n            // going anti-clockwise we have to add 90 degrees. Note that the first quadrant has index 0.\n            //\n            // 3 | 2\n            // --c-- Quadrant positions around the element's center `c`\n            // 0 | 1\n            //\n            let alpha = quadrant * Math.PI / 2\n\n            // Add an angle between the beginning of the current quadrant (line parallel with x-axis or y-axis\n            // going through the center of the element) and line crossing the indent of the fixed point and the center\n            // of the element. This is the angle we need but on the unrotated element.\n            alpha += Math.atan(quadrant % 2 == 0 ? height / width : width / height)\n\n            // Lastly we have to deduct the original angle the element was rotated by and that's it.\n            alpha -= g.toRad(angle)\n\n            // With this angle and distance we can easily calculate the centre of the unrotated element.\n            // Note that fromPolar constructor accepts an angle in radians.\n            const center = g.point.fromPolar(radius, alpha, imageFixedPoint)\n\n            // The top left corner on the unrotated element has to be half a width on the left\n            // and half a height to the top from the center. This will be the origin of rectangle\n            // we were looking for.\n            const origin = g.point(center).offset(width / -2, height / -2)\n\n            // Resize the element (before re-positioning it).\n            this.set('size', { width: width, height: height }, opt)\n\n            // Finally, re-position the element.\n            this.position(origin.x, origin.y, opt)\n\n        } else {\n\n            // Resize the element.\n            this.set('size', { width: width, height: height }, opt)\n        }\n\n        this.stopBatch('resize', opt)\n\n        return this\n    },\n\n    scale: function(sx, sy, origin, opt) {\n\n        const scaledBBox = this.getBBox().scale(sx, sy, origin)\n        this.startBatch('scale', opt)\n        this.position(scaledBBox.x, scaledBBox.y, opt)\n        this.resize(scaledBBox.width, scaledBBox.height, opt)\n        this.stopBatch('scale')\n        return this\n    },\n\n    fitEmbeds: function(opt) {\n\n        opt = opt || {}\n\n        // Getting the children's size and position requires the collection.\n        // Cell.get('embdes') helds an array of cell ids only.\n        if (!this.graph) throw new Error('Element must be part of a graph.')\n\n        const embeddedCells = this.getEmbeddedCells()\n\n        if (embeddedCells.length > 0) {\n\n            this.startBatch('fit-embeds', opt)\n\n            if (opt.deep) {\n                // Recursively apply fitEmbeds on all embeds first.\n                joint.util.invoke(embeddedCells, 'fitEmbeds', opt)\n            }\n\n            // Compute cell's size and position  based on the children bbox\n            // and given padding.\n            const bbox = this.graph.getCellsBBox(embeddedCells)\n            const padding = joint.util.normalizeSides(opt.padding)\n\n            // Apply padding computed above to the bbox.\n            bbox.moveAndExpand({\n                x: -padding.left,\n                y: -padding.top,\n                width: padding.right + padding.left,\n                height: padding.bottom + padding.top\n            })\n\n            // Set new element dimensions finally.\n            this.set({\n                position: { x: bbox.x, y: bbox.y },\n                size: { width: bbox.width, height: bbox.height }\n            }, opt)\n\n            this.stopBatch('fit-embeds')\n        }\n\n        return this\n    },\n\n    // Rotate element by `angle` degrees, optionally around `origin` point.\n    // If `origin` is not provided, it is considered to be the center of the element.\n    // If `absolute` is `true`, the `angle` is considered is abslute, i.e. it is not\n    // the difference from the previous angle.\n    rotate: function(angle, absolute, origin, opt) {\n\n        if (origin) {\n\n            const center = this.getBBox().center()\n            const size = this.get('size')\n            const position = this.get('position')\n            center.rotate(origin, this.get('angle') - angle)\n            const dx = center.x - size.width / 2 - position.x\n            const dy = center.y - size.height / 2 - position.y\n            this.startBatch('rotate', { angle: angle, absolute: absolute, origin: origin })\n            this.position(position.x + dx, position.y + dy, opt)\n            this.rotate(angle, absolute, null, opt)\n            this.stopBatch('rotate')\n\n        } else {\n\n            this.set('angle', absolute ? angle : (this.get('angle') + angle) % 360, opt)\n        }\n\n        return this\n    },\n\n    angle: function() {\n        return g.normalizeAngle(this.get('angle') || 0)\n    },\n\n    getBBox: function(opt) {\n\n        opt = opt || {}\n\n        if (opt.deep && this.graph) {\n\n            // Get all the embedded elements using breadth first algorithm,\n            // that doesn't use recursion.\n            const elements = this.getEmbeddedCells({ deep: true, breadthFirst: true })\n            // Add the model itself.\n            elements.push(this)\n\n            return this.graph.getCellsBBox(elements)\n        }\n\n        const position = this.get('position')\n        const size = this.get('size')\n\n        return new g.Rect(position.x, position.y, size.width, size.height)\n    }\n})\n\n// joint.dia.Element base view and controller.\n// -------------------------------------------\n\njoint.dia.ElementView = joint.dia.CellView.extend({\n\n    /**\n     * @abstract\n     */\n    _removePorts: function() {\n        // implemented in ports.js\n    },\n\n    /**\n     *\n     * @abstract\n     */\n    _renderPorts: function() {\n        // implemented in ports.js\n    },\n\n    className: function() {\n\n        const classNames = joint.dia.CellView.prototype.className.apply(this).split(' ')\n\n        classNames.push('element')\n\n        return classNames.join(' ')\n    },\n\n    metrics: null,\n\n    initialize: function() {\n\n        joint.dia.CellView.prototype.initialize.apply(this, arguments)\n\n        const {model} = this\n\n        this.listenTo(model, 'change:position', this.translate)\n        this.listenTo(model, 'change:size', this.resize)\n        this.listenTo(model, 'change:angle', this.rotate)\n        this.listenTo(model, 'change:markup', this.render)\n\n        this._initializePorts()\n\n        this.metrics = {}\n    },\n\n    /**\n     * @abstract\n     */\n    _initializePorts: function() {\n\n    },\n\n    update: function(cell, renderingOnlyAttrs) {\n\n        this.metrics = {}\n\n        this._removePorts()\n\n        const {model} = this\n        const modelAttrs = model.attr()\n        this.updateDOMSubtreeAttributes(this.el, modelAttrs, {\n            rootBBox: new g.Rect(model.size()),\n            selectors: this.selectors,\n            scalableNode: this.scalableNode,\n            rotatableNode: this.rotatableNode,\n            // Use rendering only attributes if they differs from the model attributes\n            roAttributes: (renderingOnlyAttrs === modelAttrs) ? null : renderingOnlyAttrs\n        })\n\n        this._renderPorts()\n    },\n\n    rotatableSelector: 'rotatable',\n    scalableSelector: 'scalable',\n    scalableNode: null,\n    rotatableNode: null,\n\n    // `prototype.markup` is rendered by default. Set the `markup` attribute on the model if the\n    // default markup is not desirable.\n    renderMarkup: function() {\n\n        const element = this.model\n        const markup = element.get('markup') || element.markup\n        if (!markup) throw new Error('dia.ElementView: markup required')\n        if (Array.isArray(markup)) return this.renderJSONMarkup(markup)\n        if (typeof markup === 'string') return this.renderStringMarkup(markup)\n        throw new Error('dia.ElementView: invalid markup')\n    },\n\n    renderJSONMarkup: function(markup) {\n\n        const doc = joint.util.parseDOMJSON(markup)\n        // Selectors\n        const selectors = this.selectors = doc.selectors\n        const rootSelector = this.selector\n        if (selectors[rootSelector]) throw new Error('dia.ElementView: ambiguous root selector.')\n        selectors[rootSelector] = this.el\n        // Cache transformation groups\n        this.rotatableNode = V(selectors[this.rotatableSelector]) || null\n        this.scalableNode = V(selectors[this.scalableSelector]) || null\n        // Fragment\n        this.vel.append(doc.fragment)\n    },\n\n    renderStringMarkup: function(markup) {\n\n        const {vel} = this\n        vel.append(V(markup))\n        // Cache transformation groups\n        this.rotatableNode = vel.findOne('.rotatable')\n        this.scalableNode = vel.findOne('.scalable')\n\n        const selectors = this.selectors = {}\n        selectors[this.selector] = this.el\n    },\n\n    render: function() {\n\n        this.vel.empty()\n        this.renderMarkup()\n        if (this.scalableNode) {\n            // Double update is necessary for elements with the scalable group only\n            // Note the resize() triggers the other `update`.\n            this.update()\n        }\n        this.resize()\n        if (this.rotatableNode) {\n            // Translate transformation is applied on `this.el` while the rotation transformation\n            // on `this.rotatableNode`\n            this.rotate()\n            this.translate()\n            return this\n        }\n        this.updateTransformation()\n        return this\n    },\n\n    resize: function() {\n\n        if (this.scalableNode) return this.sgResize.apply(this, arguments)\n        if (this.model.attributes.angle) this.rotate()\n        this.update()\n    },\n\n    translate: function() {\n\n        if (this.rotatableNode) return this.rgTranslate()\n        this.updateTransformation()\n    },\n\n    rotate: function() {\n\n        if (this.rotatableNode) return this.rgRotate()\n        this.updateTransformation()\n    },\n\n    updateTransformation: function() {\n\n        let transformation = this.getTranslateString()\n        const rotateString = this.getRotateString()\n        if (rotateString) transformation += ` ${  rotateString}`\n        this.vel.attr('transform', transformation)\n    },\n\n    getTranslateString: function() {\n\n        const {position} = this.model.attributes\n        return `translate(${  position.x  },${  position.y  })`\n    },\n\n    getRotateString: function() {\n        const {attributes} = this.model\n        const {angle} = attributes\n        if (!angle) return null\n        const {size} = attributes\n        return `rotate(${  angle  },${  size.width / 2  },${  size.height / 2  })`\n    },\n\n    getBBox: function(opt) {\n\n        let bbox\n        if (opt && opt.useModelGeometry) {\n            const {model} = this\n            bbox = model.getBBox().bbox(model.angle())\n        } else {\n            bbox = this.getNodeBBox(this.el)\n        }\n\n        return this.paper.localToPaperRect(bbox)\n    },\n\n    nodeCache: function(magnet) {\n\n        const id = V.ensureId(magnet)\n        let metrics = this.metrics[id]\n        if (!metrics) metrics = this.metrics[id] = {}\n        return metrics\n    },\n\n    getNodeData: function(magnet) {\n\n        const metrics = this.nodeCache(magnet)\n        if (!metrics.data) metrics.data = {}\n        return metrics.data\n    },\n\n    getNodeBBox: function(magnet) {\n\n        const rect = this.getNodeBoundingRect(magnet)\n        const magnetMatrix = this.getNodeMatrix(magnet)\n        const translateMatrix = this.getRootTranslateMatrix()\n        const rotateMatrix = this.getRootRotateMatrix()\n        return V.transformRect(rect, translateMatrix.multiply(rotateMatrix).multiply(magnetMatrix))\n    },\n\n    getNodeBoundingRect: function(magnet) {\n\n        const metrics = this.nodeCache(magnet)\n        if (metrics.boundingRect === undefined) metrics.boundingRect = V(magnet).getBBox()\n        return new g.Rect(metrics.boundingRect)\n    },\n\n    getNodeUnrotatedBBox: function(magnet) {\n\n        const rect = this.getNodeBoundingRect(magnet)\n        const magnetMatrix = this.getNodeMatrix(magnet)\n        const translateMatrix = this.getRootTranslateMatrix()\n        return V.transformRect(rect, translateMatrix.multiply(magnetMatrix))\n    },\n\n    getNodeShape: function(magnet) {\n\n        const metrics = this.nodeCache(magnet)\n        if (metrics.geometryShape === undefined) metrics.geometryShape = V(magnet).toGeometryShape()\n        return metrics.geometryShape.clone()\n    },\n\n    getNodeMatrix: function(magnet) {\n\n        const metrics = this.nodeCache(magnet)\n        if (metrics.magnetMatrix === undefined) {\n            const target = this.rotatableNode || this.el\n            metrics.magnetMatrix = V(magnet).getTransformToElement(target)\n        }\n        return V.createSVGMatrix(metrics.magnetMatrix)\n    },\n\n    getRootTranslateMatrix: function() {\n\n        const {model} = this\n        const position = model.position()\n        const mt = V.createSVGMatrix().translate(position.x, position.y)\n        return mt\n    },\n\n    getRootRotateMatrix: function() {\n\n        let mr = V.createSVGMatrix()\n        const {model} = this\n        const angle = model.angle()\n        if (angle) {\n            const bbox = model.getBBox()\n            const cx = bbox.width / 2\n            const cy = bbox.height / 2\n            mr = mr.translate(cx, cy).rotate(angle).translate(-cx, -cy)\n        }\n        return mr\n    },\n\n    // Rotatable & Scalable Group\n    // always slower, kept mainly for backwards compatibility\n\n    rgRotate: function() {\n\n        this.rotatableNode.attr('transform', this.getRotateString())\n    },\n\n    rgTranslate: function() {\n\n        this.vel.attr('transform', this.getTranslateString())\n    },\n\n    sgResize: function(cell, changed, opt) {\n\n        const {model} = this\n        const angle = model.get('angle') || 0\n        const size = model.get('size') || { width: 1, height: 1 }\n        const scalable = this.scalableNode\n\n        // Getting scalable group's bbox.\n        // Due to a bug in webkit's native SVG .getBBox implementation, the bbox of groups with path children includes the paths' control points.\n        // To work around the issue, we need to check whether there are any path elements inside the scalable group.\n        let recursive = false\n        if (scalable.node.getElementsByTagName('path').length > 0) {\n            // If scalable has at least one descendant that is a path, we need to switch to recursive bbox calculation.\n            // If there are no path descendants, group bbox calculation works and so we can use the (faster) native function directly.\n            recursive = true\n        }\n        const scalableBBox = scalable.getBBox({ recursive: recursive })\n\n        // Make sure `scalableBbox.width` and `scalableBbox.height` are not zero which can happen if the element does not have any content. By making\n        // the width/height 1, we prevent HTML errors of the type `scale(Infinity, Infinity)`.\n        const sx = (size.width / (scalableBBox.width || 1))\n        const sy = (size.height / (scalableBBox.height || 1))\n        scalable.attr('transform', `scale(${  sx  },${  sy  })`)\n\n        // Now the interesting part. The goal is to be able to store the object geometry via just `x`, `y`, `angle`, `width` and `height`\n        // Order of transformations is significant but we want to reconstruct the object always in the order:\n        // resize(), rotate(), translate() no matter of how the object was transformed. For that to work,\n        // we must adjust the `x` and `y` coordinates of the object whenever we resize it (because the origin of the\n        // rotation changes). The new `x` and `y` coordinates are computed by canceling the previous rotation\n        // around the center of the resized object (which is a different origin then the origin of the previous rotation)\n        // and getting the top-left corner of the resulting object. Then we clean up the rotation back to what it originally was.\n\n        // Cancel the rotation but now around a different origin, which is the center of the scaled object.\n        const rotatable = this.rotatableNode\n        const rotation = rotatable && rotatable.attr('transform')\n        if (rotation && rotation !== null) {\n\n            rotatable.attr('transform', `${rotation  } rotate(${  -angle  },${  size.width / 2  },${  size.height / 2  })`)\n            const rotatableBBox = scalable.getBBox({ target: this.paper.viewport })\n\n            // Store new x, y and perform rotate() again against the new rotation origin.\n            model.set('position', { x: rotatableBBox.x, y: rotatableBBox.y }, opt)\n            this.rotate()\n        }\n\n        // Update must always be called on non-rotated element. Otherwise, relative positioning\n        // would work with wrong (rotated) bounding boxes.\n        this.update()\n    },\n\n    // Embedding mode methods.\n    // -----------------------\n\n    prepareEmbedding: function(data) {\n\n        data || (data = {})\n\n        const model = data.model || this.model\n        const paper = data.paper || this.paper\n        const graph = paper.model\n\n        model.startBatch('to-front')\n\n        // Bring the model to the front with all his embeds.\n        model.toFront({ deep: true, ui: true })\n\n        // Note that at this point cells in the collection are not sorted by z index (it's running in the batch, see\n        // the dia.Graph._sortOnChangeZ), so we can't assume that the last cell in the collection has the highest z.\n        const maxZ = graph.get('cells').max('z').get('z')\n        const connectedLinks = graph.getConnectedLinks(model, { deep: true, includeEnclosed: true })\n\n        // Move to front also all the inbound and outbound links that are connected\n        // to any of the element descendant. If we bring to front only embedded elements,\n        // links connected to them would stay in the background.\n        joint.util.invoke(connectedLinks, 'set', 'z', maxZ + 1, { ui: true })\n\n        model.stopBatch('to-front')\n\n        // Before we start looking for suitable parent we remove the current one.\n        const parentId = model.parent()\n        parentId && graph.getCell(parentId).unembed(model, { ui: true })\n    },\n\n    processEmbedding: function(data) {\n\n        data || (data = {})\n\n        const model = data.model || this.model\n        const paper = data.paper || this.paper\n        const paperOptions = paper.options\n\n        let candidates = []\n        if (joint.util.isFunction(paperOptions.findParentBy)) {\n            const parents = joint.util.toArray(paperOptions.findParentBy.call(paper.model, this))\n            candidates = parents.filter(function(el) {\n                return el instanceof joint.dia.Cell && this.model.id !== el.id && !el.isEmbeddedIn(this.model)\n            }.bind(this))\n        } else {\n            candidates = paper.model.findModelsUnderElement(model, { searchBy: paperOptions.findParentBy })\n        }\n\n        if (paperOptions.frontParentOnly) {\n            // pick the element with the highest `z` index\n            candidates = candidates.slice(-1)\n        }\n\n        let newCandidateView = null\n        const prevCandidateView = data.candidateEmbedView\n\n        // iterate over all candidates starting from the last one (has the highest z-index).\n        for (let i = candidates.length - 1; i >= 0; i--) {\n\n            const candidate = candidates[i]\n\n            if (prevCandidateView && prevCandidateView.model.id == candidate.id) {\n\n                // candidate remains the same\n                newCandidateView = prevCandidateView\n                break\n\n            } else {\n\n                const view = candidate.findView(paper)\n                if (paperOptions.validateEmbedding.call(paper, this, view)) {\n\n                    // flip to the new candidate\n                    newCandidateView = view\n                    break\n                }\n            }\n        }\n\n        if (newCandidateView && newCandidateView != prevCandidateView) {\n            // A new candidate view found. Highlight the new one.\n            this.clearEmbedding(data)\n            data.candidateEmbedView = newCandidateView.highlight(null, { embedding: true })\n        }\n\n        if (!newCandidateView && prevCandidateView) {\n            // No candidate view found. Unhighlight the previous candidate.\n            this.clearEmbedding(data)\n        }\n    },\n\n    clearEmbedding: function(data) {\n\n        data || (data = {})\n\n        const candidateView = data.candidateEmbedView\n        if (candidateView) {\n            // No candidate view found. Unhighlight the previous candidate.\n            candidateView.unhighlight(null, { embedding: true })\n            data.candidateEmbedView = null\n        }\n    },\n\n    finalizeEmbedding: function(data) {\n\n        data || (data = {})\n\n        const candidateView = data.candidateEmbedView\n        const model = data.model || this.model\n        const paper = data.paper || this.paper\n\n        if (candidateView) {\n\n            // We finished embedding. Candidate view is chosen to become the parent of the model.\n            candidateView.model.embed(model, { ui: true })\n            candidateView.unhighlight(null, { embedding: true })\n\n            data.candidateEmbedView = null\n        }\n\n        joint.util.invoke(paper.model.getConnectedLinks(model, { deep: true }), 'reparent', { ui: true })\n    },\n\n    // Interaction. The controller part.\n    // ---------------------------------\n\n    pointerdblclick: function(evt, x, y) {\n\n        joint.dia.CellView.prototype.pointerdblclick.apply(this, arguments)\n        this.notify('element:pointerdblclick', evt, x, y)\n    },\n\n    pointerclick: function(evt, x, y) {\n\n        joint.dia.CellView.prototype.pointerclick.apply(this, arguments)\n        this.notify('element:pointerclick', evt, x, y)\n    },\n\n    contextmenu: function(evt, x, y) {\n\n        joint.dia.CellView.prototype.contextmenu.apply(this, arguments)\n        this.notify('element:contextmenu', evt, x, y)\n    },\n\n    pointerdown: function(evt, x, y) {\n\n        joint.dia.CellView.prototype.pointerdown.apply(this, arguments)\n        this.notify('element:pointerdown', evt, x, y)\n\n        this.dragStart(evt, x, y)\n    },\n\n    pointermove: function(evt, x, y) {\n\n        const data = this.eventData(evt)\n        switch (data.action) {\n            case 'move':\n                this.drag(evt, x, y)\n                break\n            case 'magnet':\n                this.dragMagnet(evt, x, y)\n                break\n        }\n\n        if (!data.stopPropagation) {\n            joint.dia.CellView.prototype.pointermove.apply(this, arguments)\n            this.notify('element:pointermove', evt, x, y)\n        }\n\n        // Make sure the element view data is passed along.\n        // It could have been wiped out in the handlers above.\n        this.eventData(evt, data)\n    },\n\n    pointerup: function(evt, x, y) {\n\n        const data = this.eventData(evt)\n        switch (data.action) {\n            case 'move':\n                this.dragEnd(evt, x, y)\n                break\n            case 'magnet':\n                this.dragMagnetEnd(evt, x, y)\n                return\n        }\n\n        if (!data.stopPropagation) {\n            this.notify('element:pointerup', evt, x, y)\n            joint.dia.CellView.prototype.pointerup.apply(this, arguments)\n        }\n    },\n\n    mouseover: function(evt) {\n\n        joint.dia.CellView.prototype.mouseover.apply(this, arguments)\n        this.notify('element:mouseover', evt)\n    },\n\n    mouseout: function(evt) {\n\n        joint.dia.CellView.prototype.mouseout.apply(this, arguments)\n        this.notify('element:mouseout', evt)\n    },\n\n    mouseenter: function(evt) {\n\n        joint.dia.CellView.prototype.mouseenter.apply(this, arguments)\n        this.notify('element:mouseenter', evt)\n    },\n\n    mouseleave: function(evt) {\n\n        joint.dia.CellView.prototype.mouseleave.apply(this, arguments)\n        this.notify('element:mouseleave', evt)\n    },\n\n    mousewheel: function(evt, x, y, delta) {\n\n        joint.dia.CellView.prototype.mousewheel.apply(this, arguments)\n        this.notify('element:mousewheel', evt, x, y, delta)\n    },\n\n    onmagnet: function(evt, x, y) {\n\n        this.dragMagnetStart(evt, x, y)\n\n        const {stopPropagation} = this.eventData(evt)\n        if (stopPropagation) evt.stopPropagation()\n    },\n\n    // Drag Start Handlers\n\n    dragStart: function(evt, x, y) {\n\n        if (!this.can('elementMove')) return\n\n        this.eventData(evt, {\n            action: 'move',\n            x: x,\n            y: y,\n            restrictedArea: this.paper.getRestrictedArea(this)\n        })\n    },\n\n    dragMagnetStart: function(evt, x, y) {\n\n        if (!this.can('addLinkFromMagnet')) return\n\n        this.model.startBatch('add-link')\n\n        const {paper} = this\n        const graph = paper.model\n        const magnet = evt.target\n        const link = paper.getDefaultLink(this, magnet)\n        const sourceEnd = this.getLinkEnd(magnet, x, y, link, 'source')\n        const targetEnd = { x: x, y: y }\n\n        link.set({ source: sourceEnd, target: targetEnd })\n        link.addTo(graph, { async: false, ui: true })\n\n        const linkView = link.findView(paper)\n        joint.dia.CellView.prototype.pointerdown.apply(linkView, arguments)\n        linkView.notify('link:pointerdown', evt, x, y)\n        const data = linkView.startArrowheadMove('target', { whenNotAllowed: 'remove' })\n        linkView.eventData(evt, data)\n\n        this.eventData(evt, {\n            action: 'magnet',\n            linkView: linkView,\n            stopPropagation: true\n        })\n\n        this.paper.delegateDragEvents(this, evt.data)\n    },\n\n    // Drag Handlers\n\n    drag: function(evt, x, y) {\n\n        const {paper} = this\n        const grid = paper.options.gridSize\n        const element = this.model\n        const position = element.position()\n        const data = this.eventData(evt)\n\n        // Make sure the new element's position always snaps to the current grid after\n        // translate as the previous one could be calculated with a different grid size.\n        const tx = g.snapToGrid(position.x, grid) - position.x + g.snapToGrid(x - data.x, grid)\n        const ty = g.snapToGrid(position.y, grid) - position.y + g.snapToGrid(y - data.y, grid)\n\n        element.translate(tx, ty, { restrictedArea: data.restrictedArea, ui: true })\n\n        let embedding = !!data.embedding\n        if (paper.options.embeddingMode) {\n            if (!embedding) {\n                // Prepare the element for embedding only if the pointer moves.\n                // We don't want to do unnecessary action with the element\n                // if an user only clicks/dblclicks on it.\n                this.prepareEmbedding(data)\n                embedding = true\n            }\n            this.processEmbedding(data)\n        }\n\n        this.eventData(evt, {\n            x: g.snapToGrid(x, grid),\n            y: g.snapToGrid(y, grid),\n            embedding: embedding\n        })\n    },\n\n    dragMagnet: function(evt, x, y) {\n\n        const data = this.eventData(evt)\n        const {linkView} = data\n        if (linkView) linkView.pointermove(evt, x, y)\n    },\n\n    // Drag End Handlers\n\n    dragEnd: function(evt, x, y) {\n\n        const data = this.eventData(evt)\n        if (data.embedding) this.finalizeEmbedding(data)\n    },\n\n    dragMagnetEnd: function(evt, x, y) {\n\n        const data = this.eventData(evt)\n        const {linkView} = data\n        if (linkView) linkView.pointerup(evt, x, y)\n\n        this.model.stopBatch('add-link')\n    }\n\n})\n\n\n// joint.dia.Link base model.\n// --------------------------\n\njoint.dia.Link = joint.dia.Cell.extend({\n\n    // The default markup for links.\n    markup: [\n        '<path class=\"connection\" stroke=\"black\" d=\"M 0 0 0 0\"/>',\n        '<path class=\"marker-source\" fill=\"black\" stroke=\"black\" d=\"M 0 0 0 0\"/>',\n        '<path class=\"marker-target\" fill=\"black\" stroke=\"black\" d=\"M 0 0 0 0\"/>',\n        '<path class=\"connection-wrap\" d=\"M 0 0 0 0\"/>',\n        '<g class=\"labels\"/>',\n        '<g class=\"marker-vertices\"/>',\n        '<g class=\"marker-arrowheads\"/>',\n        '<g class=\"link-tools\"/>'\n    ].join(''),\n\n    toolMarkup: [\n        '<g class=\"link-tool\">',\n        '<g class=\"tool-remove\" event=\"remove\">',\n        '<circle r=\"11\" />',\n        '<path transform=\"scale(.8) translate(-16, -16)\" d=\"M24.778,21.419 19.276,15.917 24.777,10.415 21.949,7.585 16.447,13.087 10.945,7.585 8.117,10.415 13.618,15.917 8.116,21.419 10.946,24.248 16.447,18.746 21.948,24.248z\" />',\n        '<title>Remove link.</title>',\n        '</g>',\n        '<g class=\"tool-options\" event=\"link:options\">',\n        '<circle r=\"11\" transform=\"translate(25)\"/>',\n        '<path fill=\"white\" transform=\"scale(.55) translate(29, -16)\" d=\"M31.229,17.736c0.064-0.571,0.104-1.148,0.104-1.736s-0.04-1.166-0.104-1.737l-4.377-1.557c-0.218-0.716-0.504-1.401-0.851-2.05l1.993-4.192c-0.725-0.91-1.549-1.734-2.458-2.459l-4.193,1.994c-0.647-0.347-1.334-0.632-2.049-0.849l-1.558-4.378C17.165,0.708,16.588,0.667,16,0.667s-1.166,0.041-1.737,0.105L12.707,5.15c-0.716,0.217-1.401,0.502-2.05,0.849L6.464,4.005C5.554,4.73,4.73,5.554,4.005,6.464l1.994,4.192c-0.347,0.648-0.632,1.334-0.849,2.05l-4.378,1.557C0.708,14.834,0.667,15.412,0.667,16s0.041,1.165,0.105,1.736l4.378,1.558c0.217,0.715,0.502,1.401,0.849,2.049l-1.994,4.193c0.725,0.909,1.549,1.733,2.459,2.458l4.192-1.993c0.648,0.347,1.334,0.633,2.05,0.851l1.557,4.377c0.571,0.064,1.148,0.104,1.737,0.104c0.588,0,1.165-0.04,1.736-0.104l1.558-4.377c0.715-0.218,1.399-0.504,2.049-0.851l4.193,1.993c0.909-0.725,1.733-1.549,2.458-2.458l-1.993-4.193c0.347-0.647,0.633-1.334,0.851-2.049L31.229,17.736zM16,20.871c-2.69,0-4.872-2.182-4.872-4.871c0-2.69,2.182-4.872,4.872-4.872c2.689,0,4.871,2.182,4.871,4.872C20.871,18.689,18.689,20.871,16,20.871z\"/>',\n        '<title>Link options.</title>',\n        '</g>',\n        '</g>'\n    ].join(''),\n\n    doubleToolMarkup: undefined,\n\n    // The default markup for showing/removing vertices. These elements are the children of the .marker-vertices element (see `this.markup`).\n    // Only .marker-vertex and .marker-vertex-remove element have special meaning. The former is used for\n    // dragging vertices (changin their position). The latter is used for removing vertices.\n    vertexMarkup: [\n        '<g class=\"marker-vertex-group\" transform=\"translate(<%= x %>, <%= y %>)\">',\n        '<circle class=\"marker-vertex\" idx=\"<%= idx %>\" r=\"10\" />',\n        '<path class=\"marker-vertex-remove-area\" idx=\"<%= idx %>\" d=\"M16,5.333c-7.732,0-14,4.701-14,10.5c0,1.982,0.741,3.833,2.016,5.414L2,25.667l5.613-1.441c2.339,1.317,5.237,2.107,8.387,2.107c7.732,0,14-4.701,14-10.5C30,10.034,23.732,5.333,16,5.333z\" transform=\"translate(5, -33)\"/>',\n        '<path class=\"marker-vertex-remove\" idx=\"<%= idx %>\" transform=\"scale(.8) translate(9.5, -37)\" d=\"M24.778,21.419 19.276,15.917 24.777,10.415 21.949,7.585 16.447,13.087 10.945,7.585 8.117,10.415 13.618,15.917 8.116,21.419 10.946,24.248 16.447,18.746 21.948,24.248z\">',\n        '<title>Remove vertex.</title>',\n        '</path>',\n        '</g>'\n    ].join(''),\n\n    arrowheadMarkup: [\n        '<g class=\"marker-arrowhead-group marker-arrowhead-group-<%= end %>\">',\n        '<path class=\"marker-arrowhead\" end=\"<%= end %>\" d=\"M 26 0 L 0 13 L 26 26 z\" />',\n        '</g>'\n    ].join(''),\n\n    // may be overwritten by user to change default label (its markup, attrs, position)\n    defaultLabel: undefined,\n\n    // deprecated\n    // may be overwritten by user to change default label markup\n    // lower priority than defaultLabel.markup\n    labelMarkup: undefined,\n\n    // private\n    _builtins: {\n        defaultLabel: {\n            // builtin default markup:\n            // used if neither defaultLabel.markup\n            // nor label.markup is set\n            markup: [\n                {\n                    tagName: 'rect',\n                    selector: 'rect' // faster than tagName CSS selector\n                }, {\n                    tagName: 'text',\n                    selector: 'text' // faster than tagName CSS selector\n                }\n            ],\n            // builtin default attributes:\n            // applied only if builtin default markup is used\n            attrs: {\n                text: {\n                    fill: '#000000',\n                    fontSize: 14,\n                    textAnchor: 'middle',\n                    yAlignment: 'middle',\n                    pointerEvents: 'none'\n                },\n                rect: {\n                    ref: 'text',\n                    fill: '#ffffff',\n                    rx: 3,\n                    ry: 3,\n                    refWidth: 1,\n                    refHeight: 1,\n                    refX: 0,\n                    refY: 0\n                }\n            },\n            // builtin default position:\n            // used if neither defaultLabel.position\n            // nor label.position is set\n            position: {\n                distance: 0.5\n            }\n        }\n    },\n\n    defaults: {\n        type: 'link',\n        source: {},\n        target: {}\n    },\n\n    isLink: function() {\n\n        return true\n    },\n\n    disconnect: function(opt) {\n\n        return this.set({\n            source: { x: 0, y: 0 },\n            target: { x: 0, y: 0 }\n        }, opt)\n    },\n\n    source: function(source, args, opt) {\n\n        // getter\n        if (source === undefined) {\n            return joint.util.clone(this.get('source'))\n        }\n\n        // setter\n        let localSource\n        let localOpt\n\n        // `source` is a cell\n        // take only its `id` and combine with `args`\n        const isCellProvided = source instanceof joint.dia.Cell\n        if (isCellProvided) { // three arguments\n            localSource = joint.util.clone(args) || {}\n            localSource.id = source.id\n            localOpt = opt\n            return this.set('source', localSource, localOpt)\n        }\n\n        // `source` is a g.Point\n        // take only its `x` and `y` and combine with `args`\n        const isPointProvided = source instanceof g.Point\n        if (isPointProvided) { // three arguments\n            localSource = joint.util.clone(args) || {}\n            localSource.x = source.x\n            localSource.y = source.y\n            localOpt = opt\n            return this.set('source', localSource, localOpt)\n        }\n\n        // `source` is an object\n        // no checking\n        // two arguments\n        localSource = source\n        localOpt = args\n        return this.set('source', localSource, localOpt)\n    },\n\n    target: function(target, args, opt) {\n\n        // getter\n        if (target === undefined) {\n            return joint.util.clone(this.get('target'))\n        }\n\n        // setter\n        let localTarget\n        let localOpt\n\n        // `target` is a cell\n        // take only its `id` argument and combine with `args`\n        const isCellProvided = target instanceof joint.dia.Cell\n        if (isCellProvided) { // three arguments\n            localTarget = joint.util.clone(args) || {}\n            localTarget.id = target.id\n            localOpt = opt\n            return this.set('target', localTarget, localOpt)\n        }\n\n        // `target` is a g.Point\n        // take only its `x` and `y` and combine with `args`\n        const isPointProvided = target instanceof g.Point\n        if (isPointProvided) { // three arguments\n            localTarget = joint.util.clone(args) || {}\n            localTarget.x = target.x\n            localTarget.y = target.y\n            localOpt = opt\n            return this.set('target', localTarget, localOpt)\n        }\n\n        // `target` is an object\n        // no checking\n        // two arguments\n        localTarget = target\n        localOpt = args\n        return this.set('target', localTarget, localOpt)\n    },\n\n    router: function(name, args, opt) {\n\n        // getter\n        if (name === undefined) {\n            const router = this.get('router')\n            if (!router) {\n                if (this.get('manhattan')) return { name: 'orthogonal' } // backwards compatibility\n                return null\n            }\n            if (typeof router === 'object') return joint.util.clone(router)\n            return router // e.g. a function\n        }\n\n        // setter\n        const isRouterProvided = ((typeof name === 'object') || (typeof name === 'function'))\n        const localRouter = isRouterProvided ? name : { name: name, args: args }\n        const localOpt = isRouterProvided ? args : opt\n\n        return this.set('router', localRouter, localOpt)\n    },\n\n    connector: function(name, args, opt) {\n\n        // getter\n        if (name === undefined) {\n            const connector = this.get('connector')\n            if (!connector) {\n                if (this.get('smooth')) return { name: 'smooth' } // backwards compatibility\n                return null\n            }\n            if (typeof connector === 'object') return joint.util.clone(connector)\n            return connector // e.g. a function\n        }\n\n        // setter\n        const isConnectorProvided = ((typeof name === 'object' || typeof name === 'function'))\n        const localConnector = isConnectorProvided ? name : { name: name, args: args }\n        const localOpt = isConnectorProvided ? args : opt\n\n        return this.set('connector', localConnector, localOpt)\n    },\n\n    // Labels API\n\n    // A convenient way to set labels. Currently set values will be mixined with `value` if used as a setter.\n    label: function(idx, label, opt) {\n\n        const labels = this.labels()\n\n        idx = (isFinite(idx) && idx !== null) ? (idx | 0) : 0\n        if (idx < 0) idx = labels.length + idx\n\n        // getter\n        if (arguments.length <= 1) return this.prop(['labels', idx])\n        // setter\n        return this.prop(['labels', idx], label, opt)\n    },\n\n    labels: function(labels, opt) {\n\n        // getter\n        if (arguments.length === 0) {\n            labels = this.get('labels')\n            if (!Array.isArray(labels)) return []\n            return labels.slice()\n        }\n        // setter\n        if (!Array.isArray(labels)) labels = []\n        return this.set('labels', labels, opt)\n    },\n\n    insertLabel: function(idx, label, opt) {\n\n        if (!label) throw new Error('dia.Link: no label provided')\n\n        const labels = this.labels()\n        const n = labels.length\n        idx = (isFinite(idx) && idx !== null) ? (idx | 0) : n\n        if (idx < 0) idx = n + idx + 1\n\n        labels.splice(idx, 0, label)\n        return this.labels(labels, opt)\n    },\n\n    // convenience function\n    // add label to end of labels array\n    appendLabel: function(label, opt) {\n\n        return this.insertLabel(-1, label, opt)\n    },\n\n    removeLabel: function(idx, opt) {\n\n        const labels = this.labels()\n        idx = (isFinite(idx) && idx !== null) ? (idx | 0) : -1\n\n        labels.splice(idx, 1)\n        return this.labels(labels, opt)\n    },\n\n    // Vertices API\n\n    vertex: function(idx, vertex, opt) {\n\n        const vertices = this.vertices()\n\n        idx = (isFinite(idx) && idx !== null) ? (idx | 0) : 0\n        if (idx < 0) idx = vertices.length + idx\n\n        // getter\n        if (arguments.length <= 1) return this.prop(['vertices', idx])\n        // setter\n        return this.prop(['vertices', idx], vertex, opt)\n    },\n\n    vertices: function(vertices, opt) {\n\n        // getter\n        if (arguments.length === 0) {\n            vertices = this.get('vertices')\n            if (!Array.isArray(vertices)) return []\n            return vertices.slice()\n        }\n        // setter\n        if (!Array.isArray(vertices)) vertices = []\n        return this.set('vertices', vertices, opt)\n    },\n\n    insertVertex: function(idx, vertex, opt) {\n\n        if (!vertex) throw new Error('dia.Link: no vertex provided')\n\n        const vertices = this.vertices()\n        const n = vertices.length\n        idx = (isFinite(idx) && idx !== null) ? (idx | 0) : n\n        if (idx < 0) idx = n + idx + 1\n\n        vertices.splice(idx, 0, vertex)\n        return this.vertices(vertices, opt)\n    },\n\n    removeVertex: function(idx, opt) {\n\n        const vertices = this.vertices()\n        idx = (isFinite(idx) && idx !== null) ? (idx | 0) : -1\n\n        vertices.splice(idx, 1)\n        return this.vertices(vertices, opt)\n    },\n\n    // Transformations\n\n    translate: function(tx, ty, opt) {\n\n        // enrich the option object\n        opt = opt || {}\n        opt.translateBy = opt.translateBy || this.id\n        opt.tx = tx\n        opt.ty = ty\n\n        return this.applyToPoints(function(p) {\n            return { x: (p.x || 0) + tx, y: (p.y || 0) + ty }\n        }, opt)\n    },\n\n    scale: function(sx, sy, origin, opt) {\n\n        return this.applyToPoints(function(p) {\n            return g.point(p).scale(sx, sy, origin).toJSON()\n        }, opt)\n    },\n\n    applyToPoints: function(fn, opt) {\n\n        if (!joint.util.isFunction(fn)) {\n            throw new TypeError('dia.Link: applyToPoints expects its first parameter to be a function.')\n        }\n\n        const attrs = {}\n\n        const source = this.source()\n        if (!source.id) {\n            attrs.source = fn(source)\n        }\n\n        const target = this.target()\n        if (!target.id) {\n            attrs.target = fn(target)\n        }\n\n        const vertices = this.vertices()\n        if (vertices.length > 0) {\n            attrs.vertices = vertices.map(fn)\n        }\n\n        return this.set(attrs, opt)\n    },\n\n    reparent: function(opt) {\n\n        let newParent\n\n        if (this.graph) {\n\n            const source = this.getSourceElement()\n            const target = this.getTargetElement()\n            const prevParent = this.getParentCell()\n\n            if (source && target) {\n                if (source === target || source.isEmbeddedIn(target)) {\n                    newParent = target\n                } else if (target.isEmbeddedIn(source)) {\n                    newParent = source\n                } else {\n                    newParent = this.graph.getCommonAncestor(source, target)\n                }\n            }\n\n            if (prevParent && (!newParent || newParent.id !== prevParent.id)) {\n                // Unembed the link if source and target has no common ancestor\n                // or common ancestor changed\n                prevParent.unembed(this, opt)\n            }\n\n            if (newParent) {\n                newParent.embed(this, opt)\n            }\n        }\n\n        return newParent\n    },\n\n    hasLoop: function(opt) {\n\n        opt = opt || {}\n\n        const sourceId = this.source().id\n        const targetId = this.target().id\n\n        if (!sourceId || !targetId) {\n            // Link \"pinned\" to the paper does not have a loop.\n            return false\n        }\n\n        let loop = sourceId === targetId\n\n        // Note that there in the deep mode a link can have a loop,\n        // even if it connects only a parent and its embed.\n        // A loop \"target equals source\" is valid in both shallow and deep mode.\n        if (!loop && opt.deep && this.graph) {\n\n            const sourceElement = this.getSourceElement()\n            const targetElement = this.getTargetElement()\n\n            loop = sourceElement.isEmbeddedIn(targetElement) || targetElement.isEmbeddedIn(sourceElement)\n        }\n\n        return loop\n    },\n\n    // unlike source(), this method returns null if source is a point\n    getSourceElement: function() {\n\n        const source = this.source()\n        const {graph} = this\n\n        return (source && source.id && graph && graph.getCell(source.id)) || null\n    },\n\n    // unlike target(), this method returns null if target is a point\n    getTargetElement: function() {\n\n        const target = this.target()\n        const {graph} = this\n\n        return (target && target.id && graph && graph.getCell(target.id)) || null\n    },\n\n    // Returns the common ancestor for the source element,\n    // target element and the link itself.\n    getRelationshipAncestor: function() {\n\n        let connectionAncestor\n\n        if (this.graph) {\n\n            const cells = [\n                this,\n                this.getSourceElement(), // null if source is a point\n                this.getTargetElement() // null if target is a point\n            ].filter(function(item) {\n                return !!item\n            })\n\n            connectionAncestor = this.graph.getCommonAncestor.apply(this.graph, cells)\n        }\n\n        return connectionAncestor || null\n    },\n\n    // Is source, target and the link itself embedded in a given cell?\n    isRelationshipEmbeddedIn: function(cell) {\n\n        const cellId = (joint.util.isString(cell) || joint.util.isNumber(cell)) ? cell : cell.id\n        const ancestor = this.getRelationshipAncestor()\n\n        return !!ancestor && (ancestor.id === cellId || ancestor.isEmbeddedIn(cellId))\n    },\n\n    // Get resolved default label.\n    _getDefaultLabel: function() {\n\n        const defaultLabel = this.get('defaultLabel') || this.defaultLabel || {}\n\n        const label = {}\n        label.markup = defaultLabel.markup || this.get('labelMarkup') || this.labelMarkup\n        label.position = defaultLabel.position\n        label.attrs = defaultLabel.attrs\n        label.size = defaultLabel.size\n\n        return label\n    }\n}, {\n\n    endsEqual: function(a, b) {\n\n        const portsEqual = a.port === b.port || !a.port && !b.port\n        return a.id === b.id && portsEqual\n    }\n})\n\n\n// joint.dia.Link base view and controller.\n// ----------------------------------------\n\njoint.dia.LinkView = joint.dia.CellView.extend({\n\n    className: function() {\n\n        const classNames = joint.dia.CellView.prototype.className.apply(this).split(' ')\n\n        classNames.push('link')\n\n        return classNames.join(' ')\n    },\n\n    options: {\n\n        shortLinkLength: 105,\n        doubleLinkTools: false,\n        longLinkLength: 155,\n        linkToolsOffset: 40,\n        doubleLinkToolsOffset: 65,\n        sampleInterval: 50,\n    },\n\n    _labelCache: null,\n    _labelSelectors: null,\n    _markerCache: null,\n    _V: null,\n    _dragData: null, // deprecated\n\n    metrics: null,\n    decimalsRounding: 2,\n\n    initialize: function(options) {\n\n        joint.dia.CellView.prototype.initialize.apply(this, arguments)\n\n        // create methods in prototype, so they can be accessed from any instance and\n        // don't need to be create over and over\n        if (typeof this.constructor.prototype.watchSource !== 'function') {\n            this.constructor.prototype.watchSource = this.createWatcher('source')\n            this.constructor.prototype.watchTarget = this.createWatcher('target')\n        }\n\n        // `_.labelCache` is a mapping of indexes of labels in the `this.get('labels')` array to\n        // `<g class=\"label\">` nodes wrapped by Vectorizer. This allows for quick access to the\n        // nodes in `updateLabelPosition()` in order to update the label positions.\n        this._labelCache = {}\n\n        // a cache of label selectors\n        this._labelSelectors = {}\n\n        // keeps markers bboxes and positions again for quicker access\n        this._markerCache = {}\n\n        // cache of default markup nodes\n        this._V = {},\n\n        // connection path metrics\n        this.metrics = {},\n\n        // bind events\n        this.startListening()\n    },\n\n    startListening: function() {\n\n        const {model} = this\n\n        this.listenTo(model, 'change:markup', this.render)\n        this.listenTo(model, 'change:smooth change:manhattan change:router change:connector', this.update)\n        this.listenTo(model, 'change:toolMarkup', this.onToolsChange)\n        this.listenTo(model, 'change:labels change:labelMarkup', this.onLabelsChange)\n        this.listenTo(model, 'change:vertices change:vertexMarkup', this.onVerticesChange)\n        this.listenTo(model, 'change:source', this.onSourceChange)\n        this.listenTo(model, 'change:target', this.onTargetChange)\n    },\n\n    onSourceChange: function(cell, source, opt) {\n\n        // Start watching the new source model.\n        this.watchSource(cell, source)\n        // This handler is called when the source attribute is changed.\n        // This can happen either when someone reconnects the link (or moves arrowhead),\n        // or when an embedded link is translated by its ancestor.\n        // 1. Always do update.\n        // 2. Do update only if the opposite end ('target') is also a point.\n        const {model} = this\n        if (!opt.translateBy || !model.get('target').id || !source.id) {\n            this.update(model, null, opt)\n        }\n    },\n\n    onTargetChange: function(cell, target, opt) {\n\n        // Start watching the new target model.\n        this.watchTarget(cell, target)\n        // See `onSourceChange` method.\n        const {model} = this\n        if (!opt.translateBy || (model.get('source').id && !target.id && joint.util.isEmpty(model.get('vertices')))) {\n            this.update(model, null, opt)\n        }\n    },\n\n    onVerticesChange: function(cell, changed, opt) {\n\n        this.renderVertexMarkers()\n\n        // If the vertices have been changed by a translation we do update only if the link was\n        // the only link that was translated. If the link was translated via another element which the link\n        // is embedded in, this element will be translated as well and that triggers an update.\n        // Note that all embeds in a model are sorted - first comes links, then elements.\n        if (!opt.translateBy || opt.translateBy === this.model.id || this.model.hasLoop()) {\n            // Vertices were changed (not as a reaction on translate)\n            // or link.translate() was called or\n            this.update(cell, null, opt)\n        }\n    },\n\n    onToolsChange: function() {\n\n        this.renderTools().updateToolsPosition()\n    },\n\n    onLabelsChange: function(link, labels, opt) {\n\n        let requireRender = true\n\n        const previousLabels = this.model.previous('labels')\n\n        if (previousLabels) {\n            // Here is an optimalization for cases when we know, that change does\n            // not require rerendering of all labels.\n            if (('propertyPathArray' in opt) && ('propertyValue' in opt)) {\n                // The label is setting by `prop()` method\n                const pathArray = opt.propertyPathArray || []\n                const pathLength = pathArray.length\n                if (pathLength > 1) {\n                    // We are changing a single label here e.g. 'labels/0/position'\n                    const labelExists = !!previousLabels[pathArray[1]]\n                    if (labelExists) {\n                        if (pathLength === 2) {\n                            // We are changing the entire label. Need to check if the\n                            // markup is also being changed.\n                            requireRender = ('markup' in Object(opt.propertyValue))\n                        } else if (pathArray[2] !== 'markup') {\n                            // We are changing a label property but not the markup\n                            requireRender = false\n                        }\n                    }\n                }\n            }\n        }\n\n        if (requireRender) {\n            this.renderLabels()\n        } else {\n            this.updateLabels()\n        }\n\n        this.updateLabelPositions()\n    },\n\n    // Rendering.\n    // ----------\n\n    render: function() {\n\n        this.vel.empty()\n        this._V = {}\n        this.renderMarkup()\n        // rendering labels has to be run after the link is appended to DOM tree. (otherwise <Text> bbox\n        // returns zero values)\n        this.renderLabels()\n        // start watching the ends of the link for changes\n        const {model} = this\n        this.watchSource(model, model.source())\n            .watchTarget(model, model.target())\n            .update()\n\n        return this\n    },\n\n    renderMarkup: function() {\n\n        const link = this.model\n        const markup = link.get('markup') || link.markup\n        if (!markup) throw new Error('dia.LinkView: markup required')\n        if (Array.isArray(markup)) return this.renderJSONMarkup(markup)\n        if (typeof markup === 'string') return this.renderStringMarkup(markup)\n        throw new Error('dia.LinkView: invalid markup')\n    },\n\n    renderJSONMarkup: function(markup) {\n\n        const doc = joint.util.parseDOMJSON(markup)\n        // Selectors\n        const selectors = this.selectors = doc.selectors\n        const rootSelector = this.selector\n        if (selectors[rootSelector]) throw new Error('dia.LinkView: ambiguous root selector.')\n        selectors[rootSelector] = this.el\n        // Fragment\n        this.vel.append(doc.fragment)\n    },\n\n    renderStringMarkup: function(markup) {\n\n        // A special markup can be given in the `properties.markup` property. This might be handy\n        // if e.g. arrowhead markers should be `<image>` elements or any other element than `<path>`s.\n        // `.connection`, `.connection-wrap`, `.marker-source` and `.marker-target` selectors\n        // of elements with special meaning though. Therefore, those classes should be preserved in any\n        // special markup passed in `properties.markup`.\n        let children = V(markup)\n        // custom markup may contain only one children\n        if (!Array.isArray(children)) children = [children]\n        // Cache all children elements for quicker access.\n        const cache = this._V // vectorized markup;\n        for (let i = 0, n = children.length; i < n; i++) {\n            const child = children[i]\n            let className = child.attr('class')\n            if (className) {\n                // Strip the joint class name prefix, if there is one.\n                className = joint.util.removeClassNamePrefix(className)\n                cache[$.camelCase(className)] = child\n            }\n        }\n        // partial rendering\n        this.renderTools()\n        this.renderVertexMarkers()\n        this.renderArrowheadMarkers()\n        this.vel.append(children)\n    },\n\n    _getLabelMarkup: function(labelMarkup) {\n\n        if (!labelMarkup) return undefined\n\n        if (Array.isArray(labelMarkup)) return this._getLabelJSONMarkup(labelMarkup)\n        if (typeof labelMarkup === 'string') return this._getLabelStringMarkup(labelMarkup)\n        throw new Error('dia.linkView: invalid label markup')\n    },\n\n    _getLabelJSONMarkup: function(labelMarkup) {\n\n        return joint.util.parseDOMJSON(labelMarkup) // fragment and selectors\n    },\n\n    _getLabelStringMarkup: function(labelMarkup) {\n\n        const children = V(labelMarkup)\n        const fragment = document.createDocumentFragment()\n\n        if (!Array.isArray(children)) {\n            fragment.append(children.node)\n\n        } else {\n            for (let i = 0, n = children.length; i < n; i++) {\n                const currentChild = children[i].node\n                fragment.appendChild(currentChild)\n            }\n        }\n\n        return { fragment: fragment, selectors: {}} // no selectors\n    },\n\n    // Label markup fragment may come wrapped in <g class=\"label\" />, or not.\n    // If it doesn't, add the <g /> container here.\n    _normalizeLabelMarkup: function(markup) {\n\n        if (!markup) return undefined\n\n        const {fragment} = markup\n        if (!(markup.fragment instanceof DocumentFragment) || !markup.fragment.hasChildNodes()) throw new Error('dia.LinkView: invalid label markup.')\n\n        let vNode\n        const {childNodes} = fragment\n\n        if ((childNodes.length > 1) || childNodes[0].nodeName.toUpperCase() !== 'G') {\n            // default markup fragment is not wrapped in <g />\n            // add a <g /> container\n\n            vNode = V('g')\n            vNode.append(fragment)\n            vNode.addClass('label')\n\n        } else {\n            vNode = V(childNodes[0])\n            vNode.addClass('label')\n        }\n\n        return { node: vNode.node, selectors: markup.selectors }\n    },\n\n    renderLabels: function() {\n\n        const cache = this._V\n        let vLabels = cache.labels\n        const labelCache = this._labelCache = {}\n        const labelSelectors = this._labelSelectors = {}\n\n        if (vLabels) vLabels.empty()\n\n        const {model} = this\n        const labels = model.get('labels') || []\n        const labelsCount = labels.length\n        if (labelsCount === 0) return this\n\n        if (!vLabels) {\n            // there is no label container in the markup but some labels are defined\n            // add a <g class=\"labels\" /> container\n            vLabels = cache.labels = V('g').addClass('labels').appendTo(this.el)\n        }\n\n        for (let i = 0; i < labelsCount; i++) {\n\n            const label = labels[i]\n            const labelMarkup = this._normalizeLabelMarkup(this._getLabelMarkup(label.markup))\n\n            var node\n            var selectors\n            if (labelMarkup) {\n                node = labelMarkup.node\n                selectors = labelMarkup.selectors\n\n            } else {\n                const builtinDefaultLabel =  model._builtins.defaultLabel\n                const builtinDefaultLabelMarkup = this._normalizeLabelMarkup(this._getLabelMarkup(builtinDefaultLabel.markup))\n\n                const defaultLabel = model._getDefaultLabel()\n                const defaultLabelMarkup = this._normalizeLabelMarkup(this._getLabelMarkup(defaultLabel.markup))\n\n                const defaultMarkup = defaultLabelMarkup || builtinDefaultLabelMarkup\n\n                node = defaultMarkup.node\n                selectors = defaultMarkup.selectors\n            }\n\n            const vLabel = V(node)\n            vLabel.attr('label-idx', i) // assign label-idx\n            vLabel.appendTo(vLabels)\n            labelCache[i] = vLabel // cache node for `updateLabels()` so it can just update label node positions\n\n            selectors[this.selector] = vLabel.node\n            labelSelectors[i] = selectors // cache label selectors for `updateLabels()`\n        }\n\n        this.updateLabels()\n\n        return this\n    },\n\n    // merge default label attrs into label attrs\n    // keep `undefined` or `null` because `{}` means something else\n    _mergeLabelAttrs: function(hasCustomMarkup, labelAttrs, defaultLabelAttrs, builtinDefaultLabelAttrs) {\n\n        if (labelAttrs === null) return null\n        if (labelAttrs === undefined) {\n\n            if (defaultLabelAttrs === null) return null\n            if (defaultLabelAttrs === undefined) {\n\n                if (hasCustomMarkup) return undefined\n                return builtinDefaultLabelAttrs\n            }\n\n            if (hasCustomMarkup) return defaultLabelAttrs\n            return joint.util.merge({}, builtinDefaultLabelAttrs, defaultLabelAttrs)\n        }\n\n        if (hasCustomMarkup) return joint.util.merge({}, defaultLabelAttrs, labelAttrs)\n        return joint.util.merge({}, builtinDefaultLabelAttrs, defaultLabelAttrs, labelAttrs)\n    },\n\n    updateLabels: function() {\n\n        if (!this._V.labels) return this\n\n        const {model} = this\n        const labels = model.get('labels') || []\n        const canLabelMove = this.can('labelMove')\n\n        const builtinDefaultLabel = model._builtins.defaultLabel\n        const builtinDefaultLabelAttrs = builtinDefaultLabel.attrs\n\n        const defaultLabel = model._getDefaultLabel()\n        const defaultLabelMarkup = defaultLabel.markup\n        const defaultLabelAttrs = defaultLabel.attrs\n\n        for (let i = 0, n = labels.length; i < n; i++) {\n\n            const vLabel = this._labelCache[i]\n            vLabel.attr('cursor', (canLabelMove ? 'move' : 'default'))\n\n            const selectors = this._labelSelectors[i]\n\n            const label = labels[i]\n            const labelMarkup = label.markup\n            const labelAttrs = label.attrs\n\n            const attrs = this._mergeLabelAttrs(\n                (labelMarkup || defaultLabelMarkup),\n                labelAttrs,\n                defaultLabelAttrs,\n                builtinDefaultLabelAttrs\n            )\n\n            this.updateDOMSubtreeAttributes(vLabel.node, attrs, {\n                rootBBox: new g.Rect(label.size),\n                selectors: selectors\n            })\n        }\n\n        return this\n    },\n\n    renderTools: function() {\n\n        if (!this._V.linkTools) return this\n\n        // Tools are a group of clickable elements that manipulate the whole link.\n        // A good example of this is the remove tool that removes the whole link.\n        // Tools appear after hovering the link close to the `source` element/point of the link\n        // but are offset a bit so that they don't cover the `marker-arrowhead`.\n\n        const $tools = $(this._V.linkTools.node).empty()\n        let toolTemplate = joint.util.template(this.model.get('toolMarkup') || this.model.toolMarkup)\n        const tool = V(toolTemplate())\n\n        $tools.append(tool.node)\n\n        // Cache the tool node so that the `updateToolsPosition()` can update the tool position quickly.\n        this._toolCache = tool\n\n        // If `doubleLinkTools` is enabled, we render copy of the tools on the other side of the\n        // link as well but only if the link is longer than `longLinkLength`.\n        if (this.options.doubleLinkTools) {\n\n            let tool2\n            if (this.model.get('doubleToolMarkup') || this.model.doubleToolMarkup) {\n                toolTemplate = joint.util.template(this.model.get('doubleToolMarkup') || this.model.doubleToolMarkup)\n                tool2 = V(toolTemplate())\n            } else {\n                tool2 = tool.clone()\n            }\n\n            $tools.append(tool2.node)\n            this._tool2Cache = tool2\n        }\n\n        return this\n    },\n\n    renderVertexMarkers: function() {\n\n        if (!this._V.markerVertices) return this\n\n        const $markerVertices = $(this._V.markerVertices.node).empty()\n\n        // A special markup can be given in the `properties.vertexMarkup` property. This might be handy\n        // if default styling (elements) are not desired. This makes it possible to use any\n        // SVG elements for .marker-vertex and .marker-vertex-remove tools.\n        const markupTemplate = joint.util.template(this.model.get('vertexMarkup') || this.model.vertexMarkup)\n\n        this.model.vertices().forEach(function(vertex, idx) {\n\n            $markerVertices.append(V(markupTemplate(joint.util.assign({ idx: idx }, vertex))).node)\n        })\n\n        return this\n    },\n\n    renderArrowheadMarkers: function() {\n\n        // Custom markups might not have arrowhead markers. Therefore, jump of this function immediately if that's the case.\n        if (!this._V.markerArrowheads) return this\n\n        const $markerArrowheads = $(this._V.markerArrowheads.node)\n\n        $markerArrowheads.empty()\n\n        // A special markup can be given in the `properties.vertexMarkup` property. This might be handy\n        // if default styling (elements) are not desired. This makes it possible to use any\n        // SVG elements for .marker-vertex and .marker-vertex-remove tools.\n        const markupTemplate = joint.util.template(this.model.get('arrowheadMarkup') || this.model.arrowheadMarkup)\n\n        this._V.sourceArrowhead = V(markupTemplate({ end: 'source' }))\n        this._V.targetArrowhead = V(markupTemplate({ end: 'target' }))\n\n        $markerArrowheads.append(this._V.sourceArrowhead.node, this._V.targetArrowhead.node)\n\n        return this\n    },\n\n    // Updating.\n    // ---------\n\n    // Default is to process the `attrs` object and set attributes on subelements based on the selectors.\n    update: function(model, attributes, opt) {\n\n        opt || (opt = {})\n\n        // update the link path\n        this.updateConnection(opt)\n\n        // update SVG attributes defined by 'attrs/'.\n        this.updateDOMSubtreeAttributes(this.el, this.model.attr(), { selectors: this.selectors })\n\n        this.updateDefaultConnectionPath()\n\n        // update the label position etc.\n        this.updateLabelPositions()\n        this.updateToolsPosition()\n        this.updateArrowheadMarkers()\n\n        this.updateTools(opt)\n        // Local perpendicular flag (as opposed to one defined on paper).\n        // Could be enabled inside a connector/router. It's valid only\n        // during the update execution.\n        this.options.perpendicular = null\n        // Mark that postponed update has been already executed.\n        this.updatePostponed = false\n\n        return this\n    },\n\n    removeRedundantLinearVertices: function(opt) {\n        const link = this.model\n        const vertices = link.vertices()\n        const conciseVertices = []\n        const n = vertices.length\n        let m = 0\n        for (let i = 0; i < n; i++) {\n            const current = new g.Point(vertices[i]).round()\n            const prev = new g.Point(conciseVertices[m - 1] || this.sourceAnchor).round()\n            if (prev.equals(current)) continue\n            const next = new g.Point(vertices[i + 1] || this.targetAnchor).round()\n            if (prev.equals(next)) continue\n            const line = new g.Line(prev, next)\n            if (line.pointOffset(current) === 0) continue\n            conciseVertices.push(vertices[i])\n            m++\n        }\n        if (n === m) return 0\n        link.vertices(conciseVertices, opt)\n        return (n - m)\n    },\n\n    updateDefaultConnectionPath: function() {\n\n        const cache = this._V\n\n        if (cache.connection) {\n            cache.connection.attr('d', this.getSerializedConnection())\n        }\n\n        if (cache.connectionWrap) {\n            cache.connectionWrap.attr('d', this.getSerializedConnection())\n        }\n\n        if (cache.markerSource && cache.markerTarget) {\n            this._translateAndAutoOrientArrows(cache.markerSource, cache.markerTarget)\n        }\n    },\n\n    getEndView: function(type) {\n        switch (type) {\n            case 'source':\n                return this.sourceView || null\n            case 'target':\n                return this.targetView || null\n            default:\n                throw new Error('dia.LinkView: type parameter required.')\n        }\n    },\n\n    getEndAnchor: function(type) {\n        switch (type) {\n            case 'source':\n                return new g.Point(this.sourceAnchor)\n            case 'target':\n                return new g.Point(this.targetAnchor)\n            default:\n                throw new Error('dia.LinkView: type parameter required.')\n        }\n    },\n\n    getEndMagnet: function(type) {\n        switch (type) {\n            case 'source':\n                var {sourceView} = this\n                if (!sourceView) break\n                return this.sourceMagnet || sourceView.el\n            case 'target':\n                var {targetView} = this\n                if (!targetView) break\n                return this.targetMagnet || targetView.el\n            default:\n                throw new Error('dia.LinkView: type parameter required.')\n        }\n        return null\n    },\n\n    updateConnection: function(opt) {\n\n        opt = opt || {}\n\n        const {model} = this\n        let route; let path\n\n        if (opt.translateBy && model.isRelationshipEmbeddedIn(opt.translateBy)) {\n            // The link is being translated by an ancestor that will\n            // shift source point, target point and all vertices\n            // by an equal distance.\n            const tx = opt.tx || 0\n            const ty = opt.ty || 0\n\n            route = (new g.Polyline(this.route)).translate(tx, ty).points\n\n            // translate source and target connection and marker points.\n            this._translateConnectionPoints(tx, ty)\n\n            // translate the path itself\n            path = this.path\n            path.translate(tx, ty)\n\n        } else {\n\n            const vertices = model.vertices()\n            // 1. Find Anchors\n\n            const anchors = this.findAnchors(vertices)\n            const sourceAnchor = this.sourceAnchor = anchors.source\n            const targetAnchor = this.targetAnchor = anchors.target\n\n            // 2. Find Route\n            route = this.findRoute(vertices, opt)\n\n            // 3. Find Connection Points\n            const connectionPoints = this.findConnectionPoints(route, sourceAnchor, targetAnchor)\n            const sourcePoint = this.sourcePoint = connectionPoints.source\n            const targetPoint = this.targetPoint = connectionPoints.target\n\n            // 3b. Find Marker Connection Point - Backwards Compatibility\n            const markerPoints = this.findMarkerPoints(route, sourcePoint, targetPoint)\n\n            // 4. Find Connection\n            path = this.findPath(route, markerPoints.source || sourcePoint, markerPoints.target || targetPoint)\n        }\n\n        this.route = route\n        this.path = path\n        this.metrics = {}\n    },\n\n    findMarkerPoints: function(route, sourcePoint, targetPoint) {\n\n        const firstWaypoint = route[0]\n        const lastWaypoint = route[route.length - 1]\n\n        // Move the source point by the width of the marker taking into account\n        // its scale around x-axis. Note that scale is the only transform that\n        // makes sense to be set in `.marker-source` attributes object\n        // as all other transforms (translate/rotate) will be replaced\n        // by the `translateAndAutoOrient()` function.\n        const cache = this._markerCache\n        // cache source and target points\n        let sourceMarkerPoint; let targetMarkerPoint\n\n        if (this._V.markerSource) {\n\n            cache.sourceBBox = cache.sourceBBox || this._V.markerSource.getBBox()\n            sourceMarkerPoint = g.point(sourcePoint).move(\n                firstWaypoint || targetPoint,\n                cache.sourceBBox.width * this._V.markerSource.scale().sx * -1\n            ).round()\n        }\n\n        if (this._V.markerTarget) {\n\n            cache.targetBBox = cache.targetBBox || this._V.markerTarget.getBBox()\n            targetMarkerPoint = g.point(targetPoint).move(\n                lastWaypoint || sourcePoint,\n                cache.targetBBox.width * this._V.markerTarget.scale().sx * -1\n            ).round()\n        }\n\n        // if there was no markup for the marker, use the connection point.\n        cache.sourcePoint = sourceMarkerPoint || sourcePoint.clone()\n        cache.targetPoint = targetMarkerPoint || targetPoint.clone()\n\n        return {\n            source: sourceMarkerPoint,\n            target: targetMarkerPoint\n        }\n    },\n\n    findAnchors: function(vertices) {\n\n        const {model} = this\n        const firstVertex = vertices[0]\n        const lastVertex = vertices[vertices.length - 1]\n        const sourceDef = model.get('source')\n        const targetDef = model.get('target')\n        const {sourceView} = this\n        const {targetView} = this\n        let sourceMagnet; let targetMagnet\n\n        // Anchor Source\n        let sourceAnchor\n        if (sourceView) {\n            sourceMagnet = (this.sourceMagnet || sourceView.el)\n            let sourceAnchorRef\n            if (firstVertex) {\n                sourceAnchorRef = new g.Point(firstVertex)\n            } else if (targetView) {\n                // TODO: the source anchor reference is not a point, how to deal with this?\n                sourceAnchorRef = this.targetMagnet || targetView.el\n            } else {\n                sourceAnchorRef = new g.Point(targetDef)\n            }\n            sourceAnchor = this.getAnchor(sourceDef.anchor, sourceView, sourceMagnet, sourceAnchorRef, 'source')\n        } else {\n            sourceAnchor = new g.Point(sourceDef)\n        }\n\n        // Anchor Target\n        let targetAnchor\n        if (targetView) {\n            targetMagnet = (this.targetMagnet || targetView.el)\n            const targetAnchorRef = new g.Point(lastVertex || sourceAnchor)\n            targetAnchor = this.getAnchor(targetDef.anchor, targetView, targetMagnet, targetAnchorRef, 'target')\n        } else {\n            targetAnchor = new g.Point(targetDef)\n        }\n\n        // Con\n        return {\n            source: sourceAnchor,\n            target: targetAnchor\n        }\n    },\n\n    findConnectionPoints: function(route, sourceAnchor, targetAnchor) {\n\n        const firstWaypoint = route[0]\n        const lastWaypoint = route[route.length - 1]\n        const {model} = this\n        const sourceDef = model.get('source')\n        const targetDef = model.get('target')\n        const {sourceView} = this\n        const {targetView} = this\n        const paperOptions = this.paper.options\n        let sourceMagnet; let targetMagnet\n\n        // Connection Point Source\n        let sourcePoint\n        if (sourceView) {\n            sourceMagnet = (this.sourceMagnet || sourceView.el)\n            const sourceConnectionPointDef = sourceDef.connectionPoint || paperOptions.defaultConnectionPoint\n            const sourcePointRef = firstWaypoint || targetAnchor\n            const sourceLine = new g.Line(sourcePointRef, sourceAnchor)\n            sourcePoint = this.getConnectionPoint(sourceConnectionPointDef, sourceView, sourceMagnet, sourceLine, 'source')\n        } else {\n            sourcePoint = sourceAnchor\n        }\n        // Connection Point Target\n        let targetPoint\n        if (targetView) {\n            targetMagnet = (this.targetMagnet || targetView.el)\n            const targetConnectionPointDef = targetDef.connectionPoint || paperOptions.defaultConnectionPoint\n            const targetPointRef = lastWaypoint || sourceAnchor\n            const targetLine = new g.Line(targetPointRef, targetAnchor)\n            targetPoint = this.getConnectionPoint(targetConnectionPointDef, targetView, targetMagnet, targetLine, 'target')\n        } else {\n            targetPoint = targetAnchor\n        }\n\n        return {\n            source: sourcePoint,\n            target: targetPoint\n        }\n    },\n\n    getAnchor: function(anchorDef, cellView, magnet, ref, endType) {\n\n        if (!anchorDef) {\n            const paperOptions = this.paper.options\n            if (paperOptions.perpendicularLinks || this.options.perpendicular) {\n                // Backwards compatibility\n                // If `perpendicularLinks` flag is set on the paper and there are vertices\n                // on the link, then try to find a connection point that makes the link perpendicular\n                // even though the link won't point to the center of the targeted object.\n                anchorDef = { name: 'perpendicular' }\n            } else {\n                anchorDef = paperOptions.defaultAnchor\n            }\n        }\n\n        if (!anchorDef) throw new Error('Anchor required.')\n        let anchorFn\n        if (typeof anchorDef === 'function') {\n            anchorFn = anchorDef\n        } else {\n            const anchorName = anchorDef.name\n            anchorFn = joint.anchors[anchorName]\n            if (typeof anchorFn !== 'function') throw new Error(`Unknown anchor: ${  anchorName}`)\n        }\n        const anchor = anchorFn.call(this, cellView, magnet, ref, anchorDef.args || {}, endType, this)\n        if (anchor) return anchor.round(this.decimalsRounding)\n        return new g.Point()\n    },\n\n\n    getConnectionPoint: function(connectionPointDef, view, magnet, line, endType) {\n\n        let connectionPoint\n        const anchor = line.end\n        // Backwards compatibility\n        const paperOptions = this.paper.options\n        if (typeof paperOptions.linkConnectionPoint === 'function') {\n            const linkConnectionMagnet = (magnet === view.el) ? undefined : magnet\n            connectionPoint = paperOptions.linkConnectionPoint(this, view, linkConnectionMagnet, line.start, endType)\n            if (connectionPoint) return connectionPoint\n        }\n\n        if (!connectionPointDef) return anchor\n        let connectionPointFn\n        if (typeof connectionPointDef === 'function') {\n            connectionPointFn = connectionPointDef\n        } else {\n            const connectionPointName = connectionPointDef.name\n            connectionPointFn = joint.connectionPoints[connectionPointName]\n            if (typeof connectionPointFn !== 'function') throw new Error(`Unknown connection point: ${  connectionPointName}`)\n        }\n        connectionPoint = connectionPointFn.call(this, line, view, magnet, connectionPointDef.args || {}, endType, this)\n        if (connectionPoint) return connectionPoint.round(this.decimalsRounding)\n        return anchor\n    },\n\n    _translateConnectionPoints: function(tx, ty) {\n\n        const cache = this._markerCache\n\n        cache.sourcePoint.offset(tx, ty)\n        cache.targetPoint.offset(tx, ty)\n        this.sourcePoint.offset(tx, ty)\n        this.targetPoint.offset(tx, ty)\n        this.sourceAnchor.offset(tx, ty)\n        this.targetAnchor.offset(tx, ty)\n    },\n\n    // if label position is a number, normalize it to a position object\n    // this makes sure that label positions can be merged properly\n    _normalizeLabelPosition: function(labelPosition) {\n\n        if (typeof labelPosition === 'number') return { distance: labelPosition, offset: null, args: null }\n        return labelPosition\n    },\n\n    updateLabelPositions: function() {\n\n        if (!this._V.labels) return this\n\n        const {path} = this\n        if (!path) return this\n\n        // This method assumes all the label nodes are stored in the `this._labelCache` hash table\n        // by their indices in the `this.get('labels')` array. This is done in the `renderLabels()` method.\n\n        const {model} = this\n        const labels = model.get('labels') || []\n        if (!labels.length) return this\n\n        const builtinDefaultLabel = model._builtins.defaultLabel\n        const builtinDefaultLabelPosition = builtinDefaultLabel.position\n\n        const defaultLabel = model._getDefaultLabel()\n        const defaultLabelPosition = this._normalizeLabelPosition(defaultLabel.position)\n\n        const defaultPosition = joint.util.merge({}, builtinDefaultLabelPosition, defaultLabelPosition)\n\n        for (let idx = 0, n = labels.length; idx < n; idx++) {\n\n            const label = labels[idx]\n            const labelPosition = this._normalizeLabelPosition(label.position)\n\n            const position = joint.util.merge({}, defaultPosition, labelPosition)\n\n            const labelPoint = this.getLabelCoordinates(position)\n            this._labelCache[idx].attr('transform', `translate(${  labelPoint.x  }, ${  labelPoint.y  })`)\n        }\n\n        return this\n    },\n\n    updateToolsPosition: function() {\n\n        if (!this._V.linkTools) return this\n\n        // Move the tools a bit to the target position but don't cover the `sourceArrowhead` marker.\n        // Note that the offset is hardcoded here. The offset should be always\n        // more than the `this.$('.marker-arrowhead[end=\"source\"]')[0].bbox().width` but looking\n        // this up all the time would be slow.\n\n        let scale = ''\n        let offset = this.options.linkToolsOffset\n        const connectionLength = this.getConnectionLength()\n\n        // Firefox returns connectionLength=NaN in odd cases (for bezier curves).\n        // In that case we won't update tools position at all.\n        if (!Number.isNaN(connectionLength)) {\n\n            // If the link is too short, make the tools half the size and the offset twice as low.\n            if (connectionLength < this.options.shortLinkLength) {\n                scale = 'scale(.5)'\n                offset /= 2\n            }\n\n            let toolPosition = this.getPointAtLength(offset)\n\n            this._toolCache.attr('transform', `translate(${  toolPosition.x  }, ${  toolPosition.y  }) ${  scale}`)\n\n            if (this.options.doubleLinkTools && connectionLength >= this.options.longLinkLength) {\n\n                const doubleLinkToolsOffset = this.options.doubleLinkToolsOffset || offset\n\n                toolPosition = this.getPointAtLength(connectionLength - doubleLinkToolsOffset)\n                this._tool2Cache.attr('transform', `translate(${  toolPosition.x  }, ${  toolPosition.y  }) ${  scale}`)\n                this._tool2Cache.attr('visibility', 'visible')\n\n            } else if (this.options.doubleLinkTools) {\n\n                this._tool2Cache.attr('visibility', 'hidden')\n            }\n        }\n\n        return this\n    },\n\n    updateArrowheadMarkers: function() {\n\n        if (!this._V.markerArrowheads) return this\n\n        // getting bbox of an element with `display=\"none\"` in IE9 ends up with access violation\n        if ($.css(this._V.markerArrowheads.node, 'display') === 'none') return this\n\n        const sx = this.getConnectionLength() < this.options.shortLinkLength ? .5 : 1\n        this._V.sourceArrowhead.scale(sx)\n        this._V.targetArrowhead.scale(sx)\n\n        this._translateAndAutoOrientArrows(this._V.sourceArrowhead, this._V.targetArrowhead)\n\n        return this\n    },\n\n    // Returns a function observing changes on an end of the link. If a change happens and new end is a new model,\n    // it stops listening on the previous one and starts listening to the new one.\n    createWatcher: function(endType) {\n\n        // create handler for specific end type (source|target).\n        const onModelChange = function(endModel, opt) {\n            this.onEndModelChange(endType, endModel, opt)\n        }\n\n        function watchEndModel(link, end) {\n\n            end = end || {}\n\n            let endModel = null\n            const previousEnd = link.previous(endType) || {}\n\n            if (previousEnd.id) {\n                this.stopListening(this.paper.getModelById(previousEnd.id), 'change', onModelChange)\n            }\n\n            if (end.id) {\n                // If the observed model changes, it caches a new bbox and do the link update.\n                endModel = this.paper.getModelById(end.id)\n                this.listenTo(endModel, 'change', onModelChange)\n            }\n\n            onModelChange.call(this, endModel, { cacheOnly: true })\n\n            return this\n        }\n\n        return watchEndModel\n    },\n\n    onEndModelChange: function(endType, endModel, opt) {\n\n        let doUpdate = !opt.cacheOnly\n        const {model} = this\n        const end = model.get(endType) || {}\n\n        if (endModel) {\n\n            const selector = this.constructor.makeSelector(end)\n            const oppositeEndType = endType == 'source' ? 'target' : 'source'\n            const oppositeEnd = model.get(oppositeEndType) || {}\n            const endId = end.id\n            const oppositeEndId = oppositeEnd.id\n            const oppositeSelector = oppositeEndId && this.constructor.makeSelector(oppositeEnd)\n\n            // Caching end models bounding boxes.\n            // If `opt.handleBy` equals the client-side ID of this link view and it is a loop link, then we already cached\n            // the bounding boxes in the previous turn (e.g. for loop link, the change:source event is followed\n            // by change:target and so on change:source, we already chached the bounding boxes of - the same - element).\n            if (opt.handleBy === this.cid && (endId === oppositeEndId) && selector == oppositeSelector) {\n\n                // Source and target elements are identical. We're dealing with a loop link. We are handling `change` event for the\n                // second time now. There is no need to calculate bbox and find magnet element again.\n                // It was calculated already for opposite link end.\n                this[`${endType  }View`] = this[`${oppositeEndType  }View`]\n                this[`${endType  }Magnet`] = this[`${oppositeEndType  }Magnet`]\n\n            } else if (opt.translateBy) {\n                // `opt.translateBy` optimizes the way we calculate bounding box of the source/target element.\n                // If `opt.translateBy` is an ID of the element that was originally translated.\n\n                // Noop\n\n            } else {\n                // The slowest path, source/target could have been rotated or resized or any attribute\n                // that affects the bounding box of the view might have been changed.\n\n                const connectedModel = this.paper.model.getCell(endId)\n                if (!connectedModel) throw new Error(`LinkView: invalid ${  endType  } cell.`)\n                const connectedView = connectedModel.findView(this.paper)\n                if (connectedView) {\n                    let connectedMagnet = connectedView.getMagnetFromLinkEnd(end)\n                    if (connectedMagnet === connectedView.el) connectedMagnet = null\n                    this[`${endType  }View`] = connectedView\n                    this[`${endType  }Magnet`] = connectedMagnet\n                } else {\n                    // the view is not rendered yet\n                    this[`${endType  }View`] = this[`${endType  }Magnet`] = null\n                }\n            }\n\n            if (opt.handleBy === this.cid && opt.translateBy &&\n                model.isEmbeddedIn(endModel) &&\n                !joint.util.isEmpty(model.get('vertices'))) {\n                // Loop link whose element was translated and that has vertices (that need to be translated with\n                // the parent in which my element is embedded).\n                // If the link is embedded, has a loop and vertices and the end model\n                // has been translated, do not update yet. There are vertices still to be updated (change:vertices\n                // event will come in the next turn).\n                doUpdate = false\n            }\n\n            if (!this.updatePostponed && oppositeEndId) {\n                // The update was not postponed (that can happen e.g. on the first change event) and the opposite\n                // end is a model (opposite end is the opposite end of the link we're just updating, e.g. if\n                // we're reacting on change:source event, the oppositeEnd is the target model).\n\n                const oppositeEndModel = this.paper.getModelById(oppositeEndId)\n\n                // Passing `handleBy` flag via event option.\n                // Note that if we are listening to the same model for event 'change' twice.\n                // The same event will be handled by this method also twice.\n                if (end.id === oppositeEnd.id) {\n                    // We're dealing with a loop link. Tell the handlers in the next turn that they should update\n                    // the link instead of me. (We know for sure there will be a next turn because\n                    // loop links react on at least two events: change on the source model followed by a change on\n                    // the target model).\n                    if (!opt.translateBy || joint.util.isEmpty(model.get('vertices')) || !model.isEmbeddedIn(opt.translateBy)) {\n                        opt.handleBy = this.cid\n                    } else {\n                        doUpdate = false\n                    }\n                }\n\n                if (doUpdate && (opt.handleBy === this.cid || (opt.translateBy && oppositeEndModel.isEmbeddedIn(opt.translateBy)))) {\n\n                    // Here are two options:\n                    // - Source and target are connected to the same model (not necessarily the same port).\n                    // - Both end models are translated by the same ancestor. We know that opposite end\n                    //   model will be translated in the next turn as well.\n                    // In both situations there will be more changes on the model that trigger an\n                    // update. So there is no need to update the linkView yet.\n                    this.updatePostponed = true\n                    doUpdate = false\n                }\n            }\n\n        } else {\n\n            // the link end is a point ~ rect 1x1\n            this[`${endType  }View`] = this[`${endType  }Magnet`] = null\n        }\n\n        if (doUpdate) {\n            this.update(model, null, opt)\n        }\n    },\n\n    _translateAndAutoOrientArrows: function(sourceArrow, targetArrow) {\n\n        // Make the markers \"point\" to their sticky points being auto-oriented towards\n        // `targetPosition`/`sourcePosition`. And do so only if there is a markup for them.\n        const route = joint.util.toArray(this.route)\n        if (sourceArrow) {\n            sourceArrow.translateAndAutoOrient(\n                this.sourcePoint,\n                route[0] || this.targetPoint,\n                this.paper.viewport\n            )\n        }\n\n        if (targetArrow) {\n            targetArrow.translateAndAutoOrient(\n                this.targetPoint,\n                route[route.length - 1] || this.sourcePoint,\n                this.paper.viewport\n            )\n        }\n    },\n\n    _getDefaultLabelPositionArgs: function() {\n\n        const defaultLabel = this.model._getDefaultLabel()\n        const defaultLabelPosition = defaultLabel.position || {}\n        return defaultLabelPosition.args\n    },\n\n    _getLabelPositionArgs: function(idx) {\n\n        const labelPosition = this.model.label(idx).position || {}\n        return labelPosition.args\n    },\n\n    // merge default label position args into label position args\n    // keep `undefined` or `null` because `{}` means something else\n    _mergeLabelPositionArgs: function(labelPositionArgs, defaultLabelPositionArgs) {\n\n        if (labelPositionArgs === null) return null\n        if (labelPositionArgs === undefined) {\n\n            if (defaultLabelPositionArgs === null) return null\n            return defaultLabelPositionArgs\n        }\n\n        return joint.util.merge({}, defaultLabelPositionArgs, labelPositionArgs)\n    },\n\n    // Add default label at given position at end of `labels` array.\n    // Assigns relative coordinates by default.\n    // `opt.absoluteDistance` forces absolute coordinates.\n    // `opt.reverseDistance` forces reverse absolute coordinates (if absoluteDistance = true).\n    // `opt.absoluteOffset` forces absolute coordinates for offset.\n    addLabel: function(x, y, opt) {\n\n        // accept input in form `{ x, y }, opt` or `x, y, opt`\n        const isPointProvided = (typeof x !== 'number')\n        const localX = isPointProvided ? x.x : x\n        const localY = isPointProvided ? x.y : y\n        const localOpt = isPointProvided ? y : opt\n\n        const defaultLabelPositionArgs = this._getDefaultLabelPositionArgs()\n        const labelPositionArgs = localOpt\n        const positionArgs = this._mergeLabelPositionArgs(labelPositionArgs, defaultLabelPositionArgs)\n\n        const label = { position: this.getLabelPosition(localX, localY, positionArgs) }\n        const idx = -1\n        this.model.insertLabel(idx, label, localOpt)\n        return idx\n    },\n\n    // Add a new vertex at calculated index to the `vertices` array.\n    addVertex: function(x, y, opt) {\n\n        // accept input in form `{ x, y }, opt` or `x, y, opt`\n        const isPointProvided = (typeof x !== 'number')\n        const localX = isPointProvided ? x.x : x\n        const localY = isPointProvided ? x.y : y\n        const localOpt = isPointProvided ? y : opt\n\n        const vertex = { x: localX, y: localY }\n        const idx = this.getVertexIndex(localX, localY)\n        this.model.insertVertex(idx, vertex, localOpt)\n        return idx\n    },\n\n    // Send a token (an SVG element, usually a circle) along the connection path.\n    // Example: `link.findView(paper).sendToken(V('circle', { r: 7, fill: 'green' }).node)`\n    // `opt.duration` is optional and is a time in milliseconds that the token travels from the source to the target of the link. Default is `1000`.\n    // `opt.directon` is optional and it determines whether the token goes from source to target or other way round (`reverse`)\n    // `opt.connection` is an optional selector to the connection path.\n    // `callback` is optional and is a function to be called once the token reaches the target.\n    sendToken: function(token, opt, callback) {\n\n        function onAnimationEnd(vToken, callback) {\n            return function() {\n                vToken.remove()\n                if (typeof callback === 'function') {\n                    callback()\n                }\n            }\n        }\n\n        let duration; let isReversed; let selector\n        if (joint.util.isObject(opt)) {\n            duration = opt.duration\n            isReversed = (opt.direction === 'reverse')\n            selector = opt.connection\n        } else {\n            // Backwards compatibility\n            duration = opt\n            isReversed = false\n            selector = null\n        }\n\n        duration = duration || 1000\n\n        const animationAttributes = {\n            dur: `${duration  }ms`,\n            repeatCount: 1,\n            calcMode: 'linear',\n            fill: 'freeze'\n        }\n\n        if (isReversed) {\n            animationAttributes.keyPoints = '1;0'\n            animationAttributes.keyTimes = '0;1'\n        }\n\n        const vToken = V(token)\n        let connection\n        if (typeof selector === 'string') {\n            // Use custom connection path.\n            connection = this.findBySelector(selector, this.el, this.selectors)[0]\n        } else {\n            // Select connection path automatically.\n            const cache = this._V\n            connection = (cache.connection) ? cache.connection.node : this.el.querySelector('path')\n        }\n\n        if (!(connection instanceof SVGPathElement)) {\n            throw new Error('dia.LinkView: token animation requires a valid connection path.')\n        }\n\n        vToken\n            .appendTo(this.paper.viewport)\n            .animateAlongPath(animationAttributes, connection)\n\n        setTimeout(onAnimationEnd(vToken, callback), duration)\n    },\n\n    findRoute: function(vertices) {\n\n        vertices || (vertices = [])\n\n        const namespace = joint.routers\n        let router = this.model.router()\n        const {defaultRouter} = this.paper.options\n\n        if (!router) {\n            if (defaultRouter) router = defaultRouter\n            else return vertices.map(g.Point, g) // no router specified\n        }\n\n        const routerFn = joint.util.isFunction(router) ? router : namespace[router.name]\n        if (!joint.util.isFunction(routerFn)) {\n            throw new Error(`dia.LinkView: unknown router: \"${  router.name  }\".`)\n        }\n\n        const args = router.args || {}\n\n        const route = routerFn.call(\n            this, // context\n            vertices, // vertices\n            args, // options\n            this // linkView\n        )\n\n        if (!route) return vertices.map(g.Point, g)\n        return route\n    },\n\n    // Return the `d` attribute value of the `<path>` element representing the link\n    // between `source` and `target`.\n    findPath: function(route, sourcePoint, targetPoint) {\n\n        const namespace = joint.connectors\n        let connector = this.model.connector()\n        const {defaultConnector} = this.paper.options\n\n        if (!connector) {\n            connector = defaultConnector || {}\n        }\n\n        const connectorFn = joint.util.isFunction(connector) ? connector : namespace[connector.name]\n        if (!joint.util.isFunction(connectorFn)) {\n            throw new Error(`dia.LinkView: unknown connector: \"${  connector.name  }\".`)\n        }\n\n        const args = joint.util.clone(connector.args || {})\n        args.raw = true // Request raw g.Path as the result.\n\n        let path = connectorFn.call(\n            this, // context\n            sourcePoint, // start point\n            targetPoint, // end point\n            route, // vertices\n            args, // options\n            this // linkView\n        )\n\n        if (typeof path === 'string') {\n            // Backwards compatibility for connectors not supporting `raw` option.\n            path = new g.Path(V.normalizePathData(path))\n        }\n\n        return path\n    },\n\n    // Public API.\n    // -----------\n\n    getConnection: function() {\n\n        const {path} = this\n        if (!path) return null\n\n        return path.clone()\n    },\n\n    getSerializedConnection: function() {\n\n        const {path} = this\n        if (!path) return null\n\n        const {metrics} = this\n        if (metrics.hasOwnProperty('data')) return metrics.data\n        const data = path.serialize()\n        metrics.data = data\n        return data\n    },\n\n    getConnectionSubdivisions: function() {\n\n        const {path} = this\n        if (!path) return null\n\n        const {metrics} = this\n        if (metrics.hasOwnProperty('segmentSubdivisions')) return metrics.segmentSubdivisions\n        const subdivisions = path.getSegmentSubdivisions()\n        metrics.segmentSubdivisions = subdivisions\n        return subdivisions\n    },\n\n    getConnectionLength: function() {\n\n        const {path} = this\n        if (!path) return 0\n\n        const {metrics} = this\n        if (metrics.hasOwnProperty('length')) return metrics.length\n        const length = path.length({ segmentSubdivisions: this.getConnectionSubdivisions() })\n        metrics.length = length\n        return length\n    },\n\n    getPointAtLength: function(length) {\n\n        const {path} = this\n        if (!path) return null\n\n        return path.pointAtLength(length, { segmentSubdivisions: this.getConnectionSubdivisions() })\n    },\n\n    getPointAtRatio: function(ratio) {\n\n        const {path} = this\n        if (!path) return null\n\n        return path.pointAt(ratio, { segmentSubdivisions: this.getConnectionSubdivisions() })\n    },\n\n    getTangentAtLength: function(length) {\n\n        const {path} = this\n        if (!path) return null\n\n        return path.tangentAtLength(length, { segmentSubdivisions: this.getConnectionSubdivisions() })\n    },\n\n    getTangentAtRatio: function(ratio) {\n\n        const {path} = this\n        if (!path) return null\n\n        return path.tangentAt(ratio, { segmentSubdivisions: this.getConnectionSubdivisions() })\n    },\n\n    getClosestPoint: function(point) {\n\n        const {path} = this\n        if (!path) return null\n\n        return path.closestPoint(point, { segmentSubdivisions: this.getConnectionSubdivisions() })\n    },\n\n    getClosestPointLength: function(point) {\n\n        const {path} = this\n        if (!path) return null\n\n        return path.closestPointLength(point, { segmentSubdivisions: this.getConnectionSubdivisions() })\n    },\n\n    getClosestPointRatio: function(point) {\n\n        const {path} = this\n        if (!path) return null\n\n        return path.closestPointNormalizedLength(point, { segmentSubdivisions: this.getConnectionSubdivisions() })\n    },\n\n    // accepts options `absoluteDistance: boolean`, `reverseDistance: boolean`, `absoluteOffset: boolean`\n    // to move beyond connection endpoints, absoluteOffset has to be set\n    getLabelPosition: function(x, y, opt) {\n\n        const position = {}\n\n        const localOpt = opt || {}\n        if (opt) position.args = opt\n\n        const isDistanceRelative = !localOpt.absoluteDistance // relative by default\n        const isDistanceAbsoluteReverse = (localOpt.absoluteDistance && localOpt.reverseDistance) // non-reverse by default\n        const isOffsetAbsolute = localOpt.absoluteOffset // offset is non-absolute by default\n\n        const {path} = this\n        const pathOpt = { segmentSubdivisions: this.getConnectionSubdivisions() }\n\n        const labelPoint = new g.Point(x, y)\n        const t = path.closestPointT(labelPoint, pathOpt)\n\n        // GET DISTANCE:\n\n        let labelDistance = path.lengthAtT(t, pathOpt)\n        if (isDistanceRelative) labelDistance = (labelDistance / this.getConnectionLength()) || 0 // fix to prevent NaN for 0 length\n        if (isDistanceAbsoluteReverse) labelDistance = (-1 * (this.getConnectionLength() - labelDistance)) || 1 // fix for end point (-0 => 1)\n\n        position.distance = labelDistance\n\n        // GET OFFSET:\n        // use absolute offset if:\n        // - opt.absoluteOffset is true,\n        // - opt.absoluteOffset is not true but there is no tangent\n\n        let tangent\n        if (!isOffsetAbsolute) tangent = path.tangentAtT(t)\n\n        let labelOffset\n        if (tangent) {\n            labelOffset = tangent.pointOffset(labelPoint)\n\n        } else {\n            const closestPoint = path.pointAtT(t)\n            const labelOffsetDiff = labelPoint.difference(closestPoint)\n            labelOffset = { x: labelOffsetDiff.x, y: labelOffsetDiff.y }\n        }\n\n        position.offset = labelOffset\n\n        return position\n    },\n\n    getLabelCoordinates: function(labelPosition) {\n\n        let labelDistance\n        if (typeof labelPosition === 'number') labelDistance = labelPosition\n        else if (typeof labelPosition.distance === 'number') labelDistance = labelPosition.distance\n        else throw new Error('dia.LinkView: invalid label position distance.')\n\n        const isDistanceRelative = ((labelDistance > 0) && (labelDistance <= 1))\n\n        let labelOffset = 0\n        const labelOffsetCoordinates = { x: 0, y: 0 }\n        if (labelPosition.offset) {\n            const positionOffset = labelPosition.offset\n            if (typeof positionOffset === 'number') labelOffset = positionOffset\n            if (positionOffset.x) labelOffsetCoordinates.x = positionOffset.x\n            if (positionOffset.y) labelOffsetCoordinates.y = positionOffset.y\n        }\n\n        const isOffsetAbsolute = ((labelOffsetCoordinates.x !== 0) || (labelOffsetCoordinates.y !== 0) || labelOffset === 0)\n\n        const {path} = this\n        const pathOpt = { segmentSubdivisions: this.getConnectionSubdivisions() }\n\n        const distance = isDistanceRelative ? (labelDistance * this.getConnectionLength()) : labelDistance\n\n        let point\n\n        if (isOffsetAbsolute) {\n            point = path.pointAtLength(distance, pathOpt)\n            point.offset(labelOffsetCoordinates)\n\n        } else {\n            const tangent = path.tangentAtLength(distance, pathOpt)\n\n            if (tangent) {\n                tangent.rotate(tangent.start, -90)\n                tangent.setLength(labelOffset)\n                point = tangent.end\n\n            } else {\n                // fallback - the connection has zero length\n                point = path.start\n            }\n        }\n\n        return point\n    },\n\n    getVertexIndex: function(x, y) {\n\n        const {model} = this\n        const vertices = model.vertices()\n\n        const vertexLength = this.getClosestPointLength(new g.Point(x, y))\n\n        let idx = 0\n        for (let n = vertices.length; idx < n; idx++) {\n            const currentVertex = vertices[idx]\n            const currentVertexLength = this.getClosestPointLength(currentVertex)\n            if (vertexLength < currentVertexLength) break\n        }\n\n        return idx\n    },\n\n    // Interaction. The controller part.\n    // ---------------------------------\n\n    pointerdblclick: function(evt, x, y) {\n\n        joint.dia.CellView.prototype.pointerdblclick.apply(this, arguments)\n        this.notify('link:pointerdblclick', evt, x, y)\n    },\n\n    pointerclick: function(evt, x, y) {\n\n        joint.dia.CellView.prototype.pointerclick.apply(this, arguments)\n        this.notify('link:pointerclick', evt, x, y)\n    },\n\n    contextmenu: function(evt, x, y) {\n\n        joint.dia.CellView.prototype.contextmenu.apply(this, arguments)\n        this.notify('link:contextmenu', evt, x, y)\n    },\n\n    pointerdown: function(evt, x, y) {\n\n        joint.dia.CellView.prototype.pointerdown.apply(this, arguments)\n        this.notify('link:pointerdown', evt, x, y)\n\n        // Backwards compatibility for the default markup\n        const className = evt.target.getAttribute('class')\n        switch (className) {\n\n            case 'marker-vertex':\n                this.dragVertexStart(evt, x, y)\n                return\n\n            case 'marker-vertex-remove':\n            case 'marker-vertex-remove-area':\n                this.dragVertexRemoveStart(evt, x, y)\n                return\n\n            case 'marker-arrowhead':\n                this.dragArrowheadStart(evt, x, y)\n                return\n\n            case 'connection':\n            case 'connection-wrap':\n                this.dragConnectionStart(evt, x, y)\n                return\n\n            case 'marker-source':\n            case 'marker-target':\n                return\n        }\n\n        this.dragStart(evt, x, y)\n    },\n\n    pointermove: function(evt, x, y) {\n\n        // Backwards compatibility\n        const dragData = this._dragData\n        if (dragData) this.eventData(evt, dragData)\n\n        const data = this.eventData(evt)\n        switch (data.action) {\n\n            case 'vertex-move':\n                this.dragVertex(evt, x, y)\n                break\n\n            case 'label-move':\n                this.dragLabel(evt, x, y)\n                break\n\n            case 'arrowhead-move':\n                this.dragArrowhead(evt, x, y)\n                break\n\n            case 'move':\n                this.drag(evt, x, y)\n                break\n        }\n\n        // Backwards compatibility\n        if (dragData) joint.util.assign(dragData, this.eventData(evt))\n\n        joint.dia.CellView.prototype.pointermove.apply(this, arguments)\n        this.notify('link:pointermove', evt, x, y)\n    },\n\n    pointerup: function(evt, x, y) {\n\n        // Backwards compatibility\n        const dragData = this._dragData\n        if (dragData) {\n            this.eventData(evt, dragData)\n            this._dragData = null\n        }\n\n        const data = this.eventData(evt)\n        switch (data.action) {\n\n            case 'vertex-move':\n                this.dragVertexEnd(evt, x, y)\n                break\n\n            case 'label-move':\n                this.dragLabelEnd(evt, x, y)\n                break\n\n            case 'arrowhead-move':\n                this.dragArrowheadEnd(evt, x, y)\n                break\n\n            case 'move':\n                this.dragEnd(evt, x, y)\n        }\n\n        this.notify('link:pointerup', evt, x, y)\n        joint.dia.CellView.prototype.pointerup.apply(this, arguments)\n    },\n\n    mouseover: function(evt) {\n\n        joint.dia.CellView.prototype.mouseover.apply(this, arguments)\n        this.notify('link:mouseover', evt)\n    },\n\n    mouseout: function(evt) {\n\n        joint.dia.CellView.prototype.mouseout.apply(this, arguments)\n        this.notify('link:mouseout', evt)\n    },\n\n    mouseenter: function(evt) {\n\n        joint.dia.CellView.prototype.mouseenter.apply(this, arguments)\n        this.notify('link:mouseenter', evt)\n    },\n\n    mouseleave: function(evt) {\n\n        joint.dia.CellView.prototype.mouseleave.apply(this, arguments)\n        this.notify('link:mouseleave', evt)\n    },\n\n    mousewheel: function(evt, x, y, delta) {\n\n        joint.dia.CellView.prototype.mousewheel.apply(this, arguments)\n        this.notify('link:mousewheel', evt, x, y, delta)\n    },\n\n    onevent: function(evt, eventName, x, y) {\n\n        // Backwards compatibility\n        const linkTool = V(evt.target).findParentByClass('link-tool', this.el)\n        if (linkTool) {\n            // Allow `interactive.useLinkTools=false`\n            if (this.can('useLinkTools')) {\n                if (eventName === 'remove') {\n                    // No further action to be executed\n                    evt.stopPropagation()\n                    // Built-in remove event\n                    this.model.remove({ ui: true })\n\n                } else {\n                    // link:options and other custom events inside the link tools\n                    this.notify(eventName, evt, x, y)\n                }\n            }\n\n        } else {\n            joint.dia.CellView.prototype.onevent.apply(this, arguments)\n        }\n    },\n\n    onlabel: function(evt, x, y) {\n\n        joint.dia.CellView.prototype.pointerdown.apply(this, arguments)\n        this.notify('link:pointerdown', evt, x, y)\n\n        this.dragLabelStart(evt, x, y)\n\n        const {stopPropagation} = this.eventData(evt)\n        if (stopPropagation) evt.stopPropagation()\n    },\n\n    // Drag Start Handlers\n\n    dragConnectionStart: function(evt, x, y) {\n\n        if (!this.can('vertexAdd')) return\n\n        // Store the index at which the new vertex has just been placed.\n        // We'll be update the very same vertex position in `pointermove()`.\n        const vertexIdx = this.addVertex({ x: x, y: y }, { ui: true })\n        this.eventData(evt, {\n            action: 'vertex-move',\n            vertexIdx: vertexIdx\n        })\n    },\n\n    dragLabelStart: function(evt, x, y) {\n\n        if (!this.can('labelMove')) {\n            // Backwards compatibility:\n            // If labels can't be dragged no default action is triggered.\n            this.eventData(evt, { stopPropagation: true })\n            return\n        }\n\n        const labelNode = evt.currentTarget\n        const labelIdx = parseInt(labelNode.getAttribute('label-idx'), 10)\n\n        const defaultLabelPositionArgs = this._getDefaultLabelPositionArgs()\n        const labelPositionArgs = this._getLabelPositionArgs(labelIdx)\n        const positionArgs = this._mergeLabelPositionArgs(labelPositionArgs, defaultLabelPositionArgs)\n\n        this.eventData(evt, {\n            action: 'label-move',\n            labelIdx: labelIdx,\n            positionArgs: positionArgs,\n            stopPropagation: true\n        })\n\n        this.paper.delegateDragEvents(this, evt.data)\n    },\n\n    dragVertexStart: function(evt, x, y) {\n\n        if (!this.can('vertexMove')) return\n\n        const vertexNode = evt.target\n        const vertexIdx = parseInt(vertexNode.getAttribute('idx'), 10)\n        this.eventData(evt, {\n            action: 'vertex-move',\n            vertexIdx: vertexIdx\n        })\n    },\n\n    dragVertexRemoveStart: function(evt, x, y) {\n\n        if (!this.can('vertexRemove')) return\n\n        const removeNode = evt.target\n        const vertexIdx = parseInt(removeNode.getAttribute('idx'), 10)\n        this.model.removeVertex(vertexIdx)\n    },\n\n    dragArrowheadStart: function(evt, x, y) {\n\n        if (!this.can('arrowheadMove')) return\n\n        const arrowheadNode = evt.target\n        const arrowheadType = arrowheadNode.getAttribute('end')\n        const data = this.startArrowheadMove(arrowheadType, { ignoreBackwardsCompatibility: true })\n\n        this.eventData(evt, data)\n    },\n\n    dragStart: function(evt, x, y) {\n\n        if (!this.can('linkMove')) return\n\n        this.eventData(evt, {\n            action: 'move',\n            dx: x,\n            dy: y\n        })\n    },\n\n    // Drag Handlers\n\n    dragLabel: function(evt, x, y) {\n\n        const data = this.eventData(evt)\n        const label = { position: this.getLabelPosition(x, y, data.positionArgs) }\n        this.model.label(data.labelIdx, label)\n    },\n\n    dragVertex: function(evt, x, y) {\n\n        const data = this.eventData(evt)\n        this.model.vertex(data.vertexIdx, { x: x, y: y }, { ui: true })\n    },\n\n    dragArrowhead: function(evt, x, y) {\n\n        const data = this.eventData(evt)\n\n        if (this.paper.options.snapLinks) {\n\n            this._snapArrowhead(x, y, data)\n\n        } else {\n            // Touchmove event's target is not reflecting the element under the coordinates as mousemove does.\n            // It holds the element when a touchstart triggered.\n            const target = (evt.type === 'mousemove')\n                ? evt.target\n                : document.elementFromPoint(evt.clientX, evt.clientY)\n\n            this._connectArrowhead(target, x, y, data)\n        }\n    },\n\n    drag: function(evt, x, y) {\n\n        const data = this.eventData(evt)\n        this.model.translate(x - data.dx, y - data.dy, { ui: true })\n        this.eventData(evt, {\n            dx: x,\n            dy: y\n        })\n    },\n\n    // Drag End Handlers\n\n    dragLabelEnd: function() {\n        // noop\n    },\n\n    dragVertexEnd: function() {\n        // noop\n    },\n\n    dragArrowheadEnd: function(evt, x, y) {\n\n        const data = this.eventData(evt)\n        const {paper} = this\n\n        if (paper.options.snapLinks) {\n            this._snapArrowheadEnd(data)\n        } else {\n            this._connectArrowheadEnd(data, x, y)\n        }\n\n        if (!paper.linkAllowed(this)) {\n            // If the changed link is not allowed, revert to its previous state.\n            this._disallow(data)\n        } else {\n            this._finishEmbedding(data)\n            this._notifyConnectEvent(data, evt)\n        }\n\n        this._afterArrowheadMove(data)\n\n        // mouseleave event is not triggered due to changing pointer-events to `none`.\n        if (!this.vel.contains(evt.target)) {\n            this.mouseleave(evt)\n        }\n    },\n\n    dragEnd: function() {\n        // noop\n    },\n\n    _disallow: function(data) {\n\n        switch (data.whenNotAllowed) {\n\n            case 'remove':\n                this.model.remove({ ui: true })\n                break\n\n            case 'revert':\n            default:\n                this.model.set(data.arrowhead, data.initialEnd, { ui: true })\n                break\n        }\n    },\n\n    _finishEmbedding: function(data) {\n\n        // Reparent the link if embedding is enabled\n        if (this.paper.options.embeddingMode && this.model.reparent()) {\n            // Make sure we don't reverse to the original 'z' index (see afterArrowheadMove()).\n            data.z = null\n        }\n    },\n\n    _notifyConnectEvent: function(data, evt) {\n\n        const {arrowhead} = data\n        const {initialEnd} = data\n        const currentEnd = this.model.prop(arrowhead)\n        const endChanged = currentEnd && !joint.dia.Link.endsEqual(initialEnd, currentEnd)\n        if (endChanged) {\n            const {paper} = this\n            if (initialEnd.id) {\n                this.notify('link:disconnect', evt, paper.findViewByModel(initialEnd.id), data.initialMagnet, arrowhead)\n            }\n            if (currentEnd.id) {\n                this.notify('link:connect', evt, paper.findViewByModel(currentEnd.id), data.magnetUnderPointer, arrowhead)\n            }\n        }\n    },\n\n    _snapArrowhead: function(x, y, data) {\n\n        // checking view in close area of the pointer\n\n        const r = this.paper.options.snapLinks.radius || 50\n        const viewsInArea = this.paper.findViewsInArea({ x: x - r, y: y - r, width: 2 * r, height: 2 * r })\n\n        if (data.closestView) {\n            data.closestView.unhighlight(data.closestMagnet, {\n                connecting: true,\n                snapping: true\n            })\n        }\n        data.closestView = data.closestMagnet = null\n\n        let distance\n        let minDistance = Number.MAX_VALUE\n        const pointer = g.point(x, y)\n        const {paper} = this\n\n        viewsInArea.forEach(function(view) {\n\n            // skip connecting to the element in case '.': { magnet: false } attribute present\n            if (view.el.getAttribute('magnet') !== 'false') {\n\n                // find distance from the center of the model to pointer coordinates\n                distance = view.model.getBBox().center().distance(pointer)\n\n                // the connection is looked up in a circle area by `distance < r`\n                if (distance < r && distance < minDistance) {\n\n                    if (paper.options.validateConnection.apply(\n                        paper, data.validateConnectionArgs(view, null)\n                    )) {\n                        minDistance = distance\n                        data.closestView = view\n                        data.closestMagnet = view.el\n                    }\n                }\n            }\n\n            view.$('[magnet]').each(function(index, magnet) {\n\n                const bbox = view.getNodeBBox(magnet)\n\n                distance = pointer.distance({\n                    x: bbox.x + bbox.width / 2,\n                    y: bbox.y + bbox.height / 2\n                })\n\n                if (distance < r && distance < minDistance) {\n\n                    if (paper.options.validateConnection.apply(\n                        paper, data.validateConnectionArgs(view, magnet)\n                    )) {\n                        minDistance = distance\n                        data.closestView = view\n                        data.closestMagnet = magnet\n                    }\n                }\n\n            })\n\n        }, this)\n\n        let end\n        const {closestView} = data\n        const {closestMagnet} = data\n        const endType = data.arrowhead\n        if (closestView) {\n            closestView.highlight(closestMagnet, {\n                connecting: true,\n                snapping: true\n            })\n            end = closestView.getLinkEnd(closestMagnet, x, y, this.model, endType)\n        } else {\n            end = { x: x, y: y }\n        }\n\n        this.model.set(endType, end || { x: x, y: y }, { ui: true })\n    },\n\n    _snapArrowheadEnd: function(data) {\n\n        // Finish off link snapping.\n        // Everything except view unhighlighting was already done on pointermove.\n        const {closestView} = data\n        const {closestMagnet} = data\n        if (closestView && closestMagnet) {\n\n            closestView.unhighlight(closestMagnet, { connecting: true, snapping: true })\n            data.magnetUnderPointer = closestView.findMagnet(closestMagnet)\n        }\n\n        data.closestView = data.closestMagnet = null\n    },\n\n    _connectArrowhead: function(target, x, y, data) {\n\n        // checking views right under the pointer\n\n        if (data.eventTarget !== target) {\n            // Unhighlight the previous view under pointer if there was one.\n            if (data.magnetUnderPointer) {\n                data.viewUnderPointer.unhighlight(data.magnetUnderPointer, {\n                    connecting: true\n                })\n            }\n\n            data.viewUnderPointer = this.paper.findView(target)\n            if (data.viewUnderPointer) {\n                // If we found a view that is under the pointer, we need to find the closest\n                // magnet based on the real target element of the event.\n                data.magnetUnderPointer = data.viewUnderPointer.findMagnet(target)\n\n                if (data.magnetUnderPointer && this.paper.options.validateConnection.apply(\n                    this.paper,\n                    data.validateConnectionArgs(data.viewUnderPointer, data.magnetUnderPointer)\n                )) {\n                    // If there was no magnet found, do not highlight anything and assume there\n                    // is no view under pointer we're interested in reconnecting to.\n                    // This can only happen if the overall element has the attribute `'.': { magnet: false }`.\n                    if (data.magnetUnderPointer) {\n                        data.viewUnderPointer.highlight(data.magnetUnderPointer, {\n                            connecting: true\n                        })\n                    }\n                } else {\n                    // This type of connection is not valid. Disregard this magnet.\n                    data.magnetUnderPointer = null\n                }\n            } else {\n                // Make sure we'll unset previous magnet.\n                data.magnetUnderPointer = null\n            }\n        }\n\n        data.eventTarget = target\n\n        this.model.set(data.arrowhead, { x: x, y: y }, { ui: true })\n    },\n\n    _connectArrowheadEnd: function(data, x, y) {\n\n        const view = data.viewUnderPointer\n        const magnet = data.magnetUnderPointer\n        if (!magnet || !view) return\n\n        view.unhighlight(magnet, { connecting: true })\n\n        const endType = data.arrowhead\n        const end = view.getLinkEnd(magnet, x, y, this.model, endType)\n        this.model.set(endType, end, { ui: true })\n    },\n\n    _beforeArrowheadMove: function(data) {\n\n        data.z = this.model.get('z')\n        this.model.toFront()\n\n        // Let the pointer propagate throught the link view elements so that\n        // the `evt.target` is another element under the pointer, not the link itself.\n        this.el.style.pointerEvents = 'none'\n\n        if (this.paper.options.markAvailable) {\n            this._markAvailableMagnets(data)\n        }\n    },\n\n    _afterArrowheadMove: function(data) {\n\n        if (data.z !== null) {\n            this.model.set('z', data.z, { ui: true })\n            data.z = null\n        }\n\n        // Put `pointer-events` back to its original value. See `startArrowheadMove()` for explanation.\n        // Value `auto` doesn't work in IE9. We force to use `visiblePainted` instead.\n        // See `https://developer.mozilla.org/en-US/docs/Web/CSS/pointer-events`.\n        this.el.style.pointerEvents = 'visiblePainted'\n\n        if (this.paper.options.markAvailable) {\n            this._unmarkAvailableMagnets(data)\n        }\n    },\n\n    _createValidateConnectionArgs: function(arrowhead) {\n        // It makes sure the arguments for validateConnection have the following form:\n        // (source view, source magnet, target view, target magnet and link view)\n        const args = []\n\n        args[4] = arrowhead\n        args[5] = this\n\n        let oppositeArrowhead\n        let i = 0\n        let j = 0\n\n        if (arrowhead === 'source') {\n            i = 2\n            oppositeArrowhead = 'target'\n        } else {\n            j = 2\n            oppositeArrowhead = 'source'\n        }\n\n        const end = this.model.get(oppositeArrowhead)\n\n        if (end.id) {\n            const view = args[i] = this.paper.findViewByModel(end.id)\n            let magnet = view.getMagnetFromLinkEnd(end)\n            if (magnet === view.el) magnet = undefined\n            args[i + 1] = magnet\n        }\n\n        function validateConnectionArgs(cellView, magnet) {\n            args[j] = cellView\n            args[j + 1] = cellView.el === magnet ? undefined : magnet\n            return args\n        }\n\n        return validateConnectionArgs\n    },\n\n    _markAvailableMagnets: function(data) {\n\n        function isMagnetAvailable(view, magnet) {\n            const {paper} = view\n            const validate = paper.options.validateConnection\n            return validate.apply(paper, this.validateConnectionArgs(view, magnet))\n        }\n\n        const {paper} = this\n        const elements = paper.model.getElements()\n        data.marked = {}\n\n        for (let i = 0, n = elements.length; i < n; i++) {\n            const view = elements[i].findView(paper)\n\n            if (!view) {\n                continue\n            }\n\n            const magnets = Array.prototype.slice.call(view.el.querySelectorAll('[magnet]'))\n            if (view.el.getAttribute('magnet') !== 'false') {\n                // Element wrapping group is also a magnet\n                magnets.push(view.el)\n            }\n\n            const availableMagnets = magnets.filter(isMagnetAvailable.bind(data, view))\n\n            if (availableMagnets.length > 0) {\n                // highlight all available magnets\n                for (let j = 0, m = availableMagnets.length; j < m; j++) {\n                    view.highlight(availableMagnets[j], { magnetAvailability: true })\n                }\n                // highlight the entire view\n                view.highlight(null, { elementAvailability: true })\n\n                data.marked[view.model.id] = availableMagnets\n            }\n        }\n    },\n\n    _unmarkAvailableMagnets: function(data) {\n\n        const markedKeys = Object.keys(data.marked)\n        let id\n        let markedMagnets\n\n        for (let i = 0, n = markedKeys.length; i < n; i++) {\n            id = markedKeys[i]\n            markedMagnets = data.marked[id]\n\n            const view = this.paper.findViewByModel(id)\n            if (view) {\n                for (let j = 0, m = markedMagnets.length; j < m; j++) {\n                    view.unhighlight(markedMagnets[j], { magnetAvailability: true })\n                }\n                view.unhighlight(null, { elementAvailability: true })\n            }\n        }\n\n        data.marked = null\n    },\n\n    startArrowheadMove: function(end, opt) {\n\n        opt || (opt = {})\n\n        // Allow to delegate events from an another view to this linkView in order to trigger arrowhead\n        // move without need to click on the actual arrowhead dom element.\n        const data = {\n            action: 'arrowhead-move',\n            arrowhead: end,\n            whenNotAllowed: opt.whenNotAllowed || 'revert',\n            initialMagnet: this[`${end  }Magnet`] || (this[`${end  }View`] ? this[`${end  }View`].el : null),\n            initialEnd: joint.util.clone(this.model.get(end)),\n            validateConnectionArgs: this._createValidateConnectionArgs(end)\n        }\n\n        this._beforeArrowheadMove(data)\n\n        if (opt.ignoreBackwardsCompatibility !== true) {\n            this._dragData = data\n        }\n\n        return data\n    }\n}, {\n\n    makeSelector: function(end) {\n\n        let selector = ''\n        // `port` has a higher precendence over `selector`. This is because the selector to the magnet\n        // might change while the name of the port can stay the same.\n        if (end.port) {\n            selector += `[port=\"${  end.port  }\"]`\n        } else if (end.selector) {\n            selector +=  end.selector\n        }\n\n        return selector\n    }\n\n})\n\n\nObject.defineProperty(joint.dia.LinkView.prototype, 'sourceBBox', {\n\n    enumerable: true,\n\n    get: function() {\n        const {sourceView} = this\n        let {sourceMagnet} = this\n        if (sourceView) {\n            if (!sourceMagnet) sourceMagnet = sourceView.el\n            return sourceView.getNodeBBox(sourceMagnet)\n        }\n        const sourceDef = this.model.source()\n        return new g.Rect(sourceDef.x, sourceDef.y, 1, 1)\n    }\n\n})\n\nObject.defineProperty(joint.dia.LinkView.prototype, 'targetBBox', {\n\n    enumerable: true,\n\n    get: function() {\n        const {targetView} = this\n        let {targetMagnet} = this\n        if (targetView) {\n            if (!targetMagnet) targetMagnet = targetView.el\n            return targetView.getNodeBBox(targetMagnet)\n        }\n        const targetDef = this.model.target()\n        return new g.Rect(targetDef.x, targetDef.y, 1, 1)\n    }\n})\n\n\njoint.dia.Paper = joint.mvc.View.extend({\n\n    className: 'paper',\n\n    options: {\n\n        width: 800,\n        height: 600,\n        origin: { x: 0, y: 0 }, // x,y coordinates in top-left corner\n        gridSize: 1,\n\n        // Whether or not to draw the grid lines on the paper's DOM element.\n        // e.g drawGrid: true, drawGrid: { color: 'red', thickness: 2 }\n        drawGrid: false,\n\n        // Whether or not to draw the background on the paper's DOM element.\n        // e.g. background: { color: 'lightblue', image: '/paper-background.png', repeat: 'flip-xy' }\n        background: false,\n\n        perpendicularLinks: false,\n        elementView: joint.dia.ElementView,\n        linkView: joint.dia.LinkView,\n        snapLinks: false, // false, true, { radius: value }\n\n        // When set to FALSE, an element may not have more than 1 link with the same source and target element.\n        multiLinks: true,\n\n        // For adding custom guard logic.\n        guard: function(evt, view) {\n\n            // FALSE means the event isn't guarded.\n            return false\n        },\n\n        highlighting: {\n            default: {\n                name: 'stroke',\n                options: {\n                    padding: 3\n                }\n            },\n            magnetAvailability: {\n                name: 'addClass',\n                options: {\n                    className: 'available-magnet'\n                }\n            },\n            elementAvailability: {\n                name: 'addClass',\n                options: {\n                    className: 'available-cell'\n                }\n            }\n        },\n\n        // Prevent the default context menu from being displayed.\n        preventContextMenu: true,\n\n        // Prevent the default action for blank:pointer<action>.\n        preventDefaultBlankAction: true,\n\n        // Restrict the translation of elements by given bounding box.\n        // Option accepts a boolean:\n        //  true - the translation is restricted to the paper area\n        //  false - no restrictions\n        // A method:\n        // restrictTranslate: function(elementView) {\n        //     var parentId = elementView.model.get('parent');\n        //     return parentId && this.model.getCell(parentId).getBBox();\n        // },\n        // Or a bounding box:\n        // restrictTranslate: { x: 10, y: 10, width: 790, height: 590 }\n        restrictTranslate: false,\n\n        // Marks all available magnets with 'available-magnet' class name and all available cells with\n        // 'available-cell' class name. Marks them when dragging a link is started and unmark\n        // when the dragging is stopped.\n        markAvailable: false,\n\n        // Defines what link model is added to the graph after an user clicks on an active magnet.\n        // Value could be the Backbone.model or a function returning the Backbone.model\n        // defaultLink: function(elementView, magnet) { return condition ? new customLink1() : new customLink2() }\n        defaultLink: new joint.dia.Link,\n\n        // A connector that is used by links with no connector defined on the model.\n        // e.g. { name: 'rounded', args: { radius: 5 }} or a function\n        defaultConnector: { name: 'normal' },\n\n        // A router that is used by links with no router defined on the model.\n        // e.g. { name: 'oneSide', args: { padding: 10 }} or a function\n        defaultRouter: { name: 'normal' },\n\n        defaultAnchor: { name: 'center' },\n\n        defaultConnectionPoint: { name: 'bbox' },\n\n        /* CONNECTING */\n\n        connectionStrategy: null,\n\n        // Check whether to add a new link to the graph when user clicks on an a magnet.\n        validateMagnet: function(cellView, magnet) {\n            return magnet.getAttribute('magnet') !== 'passive'\n        },\n\n        // Check whether to allow or disallow the link connection while an arrowhead end (source/target)\n        // being changed.\n        validateConnection: function(cellViewS, magnetS, cellViewT, magnetT, end, linkView) {\n            return (end === 'target' ? cellViewT : cellViewS) instanceof joint.dia.ElementView\n        },\n\n        /* EMBEDDING */\n\n        // Enables embedding. Reparents the dragged element with elements under it and makes sure that\n        // all links and elements are visible taken the level of embedding into account.\n        embeddingMode: false,\n\n        // Check whether to allow or disallow the element embedding while an element being translated.\n        validateEmbedding: function(childView, parentView) {\n            // by default all elements can be in relation child-parent\n            return true\n        },\n\n        // Determines the way how a cell finds a suitable parent when it's dragged over the paper.\n        // The cell with the highest z-index (visually on the top) will be chosen.\n        findParentBy: 'bbox', // 'bbox'|'center'|'origin'|'corner'|'topRight'|'bottomLeft'\n\n        // If enabled only the element on the very front is taken into account for the embedding.\n        // If disabled the elements under the dragged view are tested one by one\n        // (from front to back) until a valid parent found.\n        frontParentOnly: true,\n\n        // Interactive flags. See online docs for the complete list of interactive flags.\n        interactive: {\n            labelMove: false\n        },\n\n        // When set to true the links can be pinned to the paper.\n        // i.e. link source/target can be a point e.g. link.get('source') ==> { x: 100, y: 100 };\n        linkPinning: true,\n\n        // Custom validation after an interaction with a link ends.\n        // Recognizes a function. If `false` is returned, the link is disallowed (removed or reverted)\n        // (linkView, paper) => boolean\n        allowLink: null,\n\n        // Allowed number of mousemove events after which the pointerclick event will be still triggered.\n        clickThreshold: 0,\n\n        // Number of required mousemove events before the first pointermove event will be triggered.\n        moveThreshold: 0,\n\n        // The namespace, where all the cell views are defined.\n        cellViewNamespace: joint.shapes,\n\n        // The namespace, where all the cell views are defined.\n        highlighterNamespace: joint.highlighters\n    },\n\n    events: {\n        dblclick: 'pointerdblclick',\n        click: 'pointerclick', // triggered alongside pointerdown and pointerup if no movement\n        touchend: 'pointerclick', // triggered alongside pointerdown and pointerup if no movement\n        contextmenu: 'contextmenu',\n        mousedown: 'pointerdown',\n        touchstart: 'pointerdown',\n        mouseover: 'mouseover',\n        mouseout: 'mouseout',\n        mouseenter: 'mouseenter',\n        mouseleave: 'mouseleave',\n        mousewheel: 'mousewheel',\n        DOMMouseScroll: 'mousewheel',\n        'mouseenter .joint-cell': 'mouseenter',\n        'mouseleave .joint-cell': 'mouseleave',\n        'mouseenter .joint-tools': 'mouseenter',\n        'mouseleave .joint-tools': 'mouseleave',\n        'mousedown .joint-cell [event]': 'onevent', // interaction with cell with `event` attribute set\n        'touchstart .joint-cell [event]': 'onevent',\n        'mousedown .joint-cell [magnet]': 'onmagnet', // interaction with cell with `magnet` attribute set\n        'touchstart .joint-cell [magnet]': 'onmagnet',\n        'mousedown .joint-link .label': 'onlabel', // interaction with link label\n        'touchstart .joint-link .label': 'onlabel',\n        'dragstart .joint-cell image': 'onImageDragStart' // firefox fix\n    },\n\n    documentEvents: {\n        mousemove: 'pointermove',\n        touchmove: 'pointermove',\n        mouseup: 'pointerup',\n        touchend: 'pointerup',\n        touchcancel: 'pointerup'\n    },\n\n    _highlights: {},\n\n    init: function() {\n\n        joint.util.bindAll(this, 'pointerup')\n\n        const model = this.model = this.options.model || new joint.dia.Graph\n\n        this.setGrid(this.options.drawGrid)\n        this.cloneOptions()\n        this.render()\n        this.setDimensions()\n\n        this.listenTo(model, 'add', this.onCellAdded)\n            .listenTo(model, 'remove', this.removeView)\n            .listenTo(model, 'reset', this.resetViews)\n            .listenTo(model, 'sort', this._onSort)\n            .listenTo(model, 'batch:stop', this._onBatchStop)\n\n        this.on('cell:highlight', this.onCellHighlight)\n            .on('cell:unhighlight', this.onCellUnhighlight)\n            .on('scale translate', this.update)\n\n        // Hold the value when mouse has been moved: when mouse moved, no click event will be triggered.\n        this._mousemoved = 0\n        // Hash of all cell views.\n        this._views = {}\n        // Reference to the paper owner document\n        this.$document = $(this.el.ownerDocument)\n    },\n\n    cloneOptions: function() {\n\n        const {options} = this\n\n        // This is a fix for the case where two papers share the same options.\n        // Changing origin.x for one paper would change the value of origin.x for the other.\n        // This prevents that behavior.\n        options.origin = joint.util.assign({}, options.origin)\n        options.defaultConnector = joint.util.assign({}, options.defaultConnector)\n        // Return the default highlighting options into the user specified options.\n        options.highlighting = joint.util.defaultsDeep(\n            {},\n            options.highlighting,\n            this.constructor.prototype.options.highlighting\n        )\n    },\n\n    render: function() {\n\n        this.$el.empty()\n\n        this.svg = V('svg').attr({ width: '100%', height: '100%' }).node\n        this.viewport = V('g').addClass(joint.util.addClassNamePrefix('viewport')).node\n        this.defs = V('defs').node\n        this.tools = V('g').addClass(joint.util.addClassNamePrefix('tools-container')).node\n        // Append `<defs>` element to the SVG document. This is useful for filters and gradients.\n        // It's desired to have the defs defined before the viewport (e.g. to make a PDF document pick up defs properly).\n        V(this.svg).append([this.defs, this.viewport, this.tools])\n\n        this.$background = $('<div/>').addClass(joint.util.addClassNamePrefix('paper-background'))\n        if (this.options.background) {\n            this.drawBackground(this.options.background)\n        }\n\n        this.$grid = $('<div/>').addClass(joint.util.addClassNamePrefix('paper-grid'))\n        if (this.options.drawGrid) {\n            this.drawGrid()\n        }\n\n        this.$el.append(this.$background, this.$grid, this.svg)\n\n        return this\n    },\n\n    update: function() {\n\n        if (this.options.drawGrid) {\n            this.drawGrid()\n        }\n\n        if (this._background) {\n            this.updateBackgroundImage(this._background)\n        }\n\n        return this\n    },\n\n    // For storing the current transformation matrix (CTM) of the paper's viewport.\n    _viewportMatrix: null,\n\n    // For verifying whether the CTM is up-to-date. The viewport transform attribute\n    // could have been manipulated directly.\n    _viewportTransformString: null,\n\n    matrix: function(ctm) {\n\n        const {viewport} = this\n\n        // Getter:\n        if (ctm === undefined) {\n\n            const transformString = viewport.getAttribute('transform')\n\n            if ((this._viewportTransformString || null) === transformString) {\n                // It's ok to return the cached matrix. The transform attribute has not changed since\n                // the matrix was stored.\n                ctm = this._viewportMatrix\n            } else {\n                // The viewport transform attribute has changed. Measure the matrix and cache again.\n                ctm = viewport.getCTM()\n                this._viewportMatrix = ctm\n                this._viewportTransformString = transformString\n            }\n\n            // Clone the cached current transformation matrix.\n            // If no matrix previously stored the identity matrix is returned.\n            return V.createSVGMatrix(ctm)\n        }\n\n        // Setter:\n        ctm = V.createSVGMatrix(ctm)\n        const ctmString = V.matrixToTransformString(ctm)\n        viewport.setAttribute('transform', ctmString)\n        this.tools.setAttribute('transform', ctmString)\n\n        this._viewportMatrix = ctm\n        this._viewportTransformString = viewport.getAttribute('transform')\n\n        return this\n    },\n\n    clientMatrix: function() {\n\n        return V.createSVGMatrix(this.viewport.getScreenCTM())\n    },\n\n    _sortDelayingBatches: ['add', 'to-front', 'to-back'],\n\n    _onSort: function() {\n        if (!this.model.hasActiveBatch(this._sortDelayingBatches)) {\n            this.sortViews()\n        }\n    },\n\n    _onBatchStop: function(data) {\n        const name = data && data.batchName\n        if (this._sortDelayingBatches.includes(name) &&\n            !this.model.hasActiveBatch(this._sortDelayingBatches)) {\n            this.sortViews()\n        }\n    },\n\n    onRemove: function() {\n\n        //clean up all DOM elements/views to prevent memory leaks\n        this.removeViews()\n    },\n\n    setDimensions: function(width, height) {\n\n        width = this.options.width = width || this.options.width\n        height = this.options.height = height || this.options.height\n\n        this.$el.css({\n            width: Math.round(width),\n            height: Math.round(height)\n        })\n\n        this.trigger('resize', width, height)\n    },\n\n    setOrigin: function(ox, oy) {\n\n        return this.translate(ox || 0, oy || 0, { absolute: true })\n    },\n\n    // Expand/shrink the paper to fit the content. Snap the width/height to the grid\n    // defined in `gridWidth`, `gridHeight`. `padding` adds to the resulting width/height of the paper.\n    // When options { fitNegative: true } it also translates the viewport in order to make all\n    // the content visible.\n    fitToContent: function(gridWidth, gridHeight, padding, opt) { // alternatively function(opt)\n\n        if (joint.util.isObject(gridWidth)) {\n            // first parameter is an option object\n            opt = gridWidth\n            gridWidth = opt.gridWidth || 1\n            gridHeight = opt.gridHeight || 1\n            padding = opt.padding || 0\n\n        } else {\n\n            opt = opt || {}\n            gridWidth = gridWidth || 1\n            gridHeight = gridHeight || 1\n            padding = padding || 0\n        }\n\n        padding = joint.util.normalizeSides(padding)\n\n        // Calculate the paper size to accomodate all the graph's elements.\n        const bbox = V(this.viewport).getBBox()\n\n        const currentScale = this.scale()\n        const currentTranslate = this.translate()\n\n        bbox.x *= currentScale.sx\n        bbox.y *= currentScale.sy\n        bbox.width *= currentScale.sx\n        bbox.height *= currentScale.sy\n\n        let calcWidth = Math.max(Math.ceil((bbox.width + bbox.x) / gridWidth), 1) * gridWidth\n        let calcHeight = Math.max(Math.ceil((bbox.height + bbox.y) / gridHeight), 1) * gridHeight\n\n        let tx = 0\n        let ty = 0\n\n        if ((opt.allowNewOrigin == 'negative' && bbox.x < 0) || (opt.allowNewOrigin == 'positive' && bbox.x >= 0) || opt.allowNewOrigin == 'any') {\n            tx = Math.ceil(-bbox.x / gridWidth) * gridWidth\n            tx += padding.left\n            calcWidth += tx\n        }\n\n        if ((opt.allowNewOrigin == 'negative' && bbox.y < 0) || (opt.allowNewOrigin == 'positive' && bbox.y >= 0) || opt.allowNewOrigin == 'any') {\n            ty = Math.ceil(-bbox.y / gridHeight) * gridHeight\n            ty += padding.top\n            calcHeight += ty\n        }\n\n        calcWidth += padding.right\n        calcHeight += padding.bottom\n\n        // Make sure the resulting width and height are greater than minimum.\n        calcWidth = Math.max(calcWidth, opt.minWidth || 0)\n        calcHeight = Math.max(calcHeight, opt.minHeight || 0)\n\n        // Make sure the resulting width and height are lesser than maximum.\n        calcWidth = Math.min(calcWidth, opt.maxWidth || Number.MAX_VALUE)\n        calcHeight = Math.min(calcHeight, opt.maxHeight || Number.MAX_VALUE)\n\n        const dimensionChange = calcWidth != this.options.width || calcHeight != this.options.height\n        const originChange = tx != currentTranslate.tx || ty != currentTranslate.ty\n\n        // Change the dimensions only if there is a size discrepency or an origin change\n        if (originChange) {\n            this.translate(tx, ty)\n        }\n        if (dimensionChange) {\n            this.setDimensions(calcWidth, calcHeight)\n        }\n    },\n\n    scaleContentToFit: function(opt) {\n\n        const contentBBox = this.getContentBBox()\n\n        if (!contentBBox.width || !contentBBox.height) return\n\n        opt = opt || {}\n\n        joint.util.defaults(opt, {\n            padding: 0,\n            preserveAspectRatio: true,\n            scaleGrid: null,\n            minScale: 0,\n            maxScale: Number.MAX_VALUE\n            //minScaleX\n            //minScaleY\n            //maxScaleX\n            //maxScaleY\n            //fittingBBox\n        })\n\n        const {padding} = opt\n\n        const minScaleX = opt.minScaleX || opt.minScale\n        const maxScaleX = opt.maxScaleX || opt.maxScale\n        const minScaleY = opt.minScaleY || opt.minScale\n        const maxScaleY = opt.maxScaleY || opt.maxScale\n\n        let fittingBBox\n        if (opt.fittingBBox) {\n            fittingBBox = opt.fittingBBox\n        } else {\n            const currentTranslate = this.translate()\n            fittingBBox = {\n                x: currentTranslate.tx,\n                y: currentTranslate.ty,\n                width: this.options.width,\n                height: this.options.height\n            }\n        }\n\n        fittingBBox = g.rect(fittingBBox).moveAndExpand({\n            x: padding,\n            y: padding,\n            width: -2 * padding,\n            height: -2 * padding\n        })\n\n        const currentScale = this.scale()\n\n        let newSx = fittingBBox.width / contentBBox.width * currentScale.sx\n        let newSy = fittingBBox.height / contentBBox.height * currentScale.sy\n\n        if (opt.preserveAspectRatio) {\n            newSx = newSy = Math.min(newSx, newSy)\n        }\n\n        // snap scale to a grid\n        if (opt.scaleGrid) {\n\n            const gridSize = opt.scaleGrid\n\n            newSx = gridSize * Math.floor(newSx / gridSize)\n            newSy = gridSize * Math.floor(newSy / gridSize)\n        }\n\n        // scale min/max boundaries\n        newSx = Math.min(maxScaleX, Math.max(minScaleX, newSx))\n        newSy = Math.min(maxScaleY, Math.max(minScaleY, newSy))\n\n        this.scale(newSx, newSy)\n\n        const contentTranslation = this.getContentBBox()\n\n        const newOx = fittingBBox.x - contentTranslation.x\n        const newOy = fittingBBox.y - contentTranslation.y\n\n        this.translate(newOx, newOy)\n    },\n\n    // Return the dimensions of the content area in local units (without transformations).\n    getContentArea: function() {\n\n        return V(this.viewport).getBBox()\n    },\n\n    // Return the dimensions of the content bbox in client units (as it appears on screen).\n    getContentBBox: function() {\n\n        const crect = this.viewport.getBoundingClientRect()\n\n        // Using Screen CTM was the only way to get the real viewport bounding box working in both\n        // Google Chrome and Firefox.\n        const clientCTM = this.clientMatrix()\n\n        // for non-default origin we need to take the viewport translation into account\n        const currentTranslate = this.translate()\n\n        return g.rect({\n            x: crect.left - clientCTM.e + currentTranslate.tx,\n            y: crect.top - clientCTM.f + currentTranslate.ty,\n            width: crect.width,\n            height: crect.height\n        })\n    },\n\n    // Returns a geometry rectangle represeting the entire\n    // paper area (coordinates from the left paper border to the right one\n    // and the top border to the bottom one).\n    getArea: function() {\n\n        return this.paperToLocalRect({\n            x: 0,\n            y: 0,\n            width: this.options.width,\n            height: this.options.height\n        })\n    },\n\n    getRestrictedArea: function() {\n\n        let restrictedArea\n\n        if (joint.util.isFunction(this.options.restrictTranslate)) {\n            // A method returning a bounding box\n            restrictedArea = this.options.restrictTranslate.apply(this, arguments)\n        } else if (this.options.restrictTranslate === true) {\n            // The paper area\n            restrictedArea = this.getArea()\n        } else {\n            // Either false or a bounding box\n            restrictedArea = this.options.restrictTranslate || null\n        }\n\n        return restrictedArea\n    },\n\n    createViewForModel: function(cell) {\n\n        // A class taken from the paper options.\n        let optionalViewClass\n\n        // A default basic class (either dia.ElementView or dia.LinkView)\n        let defaultViewClass\n\n        // A special class defined for this model in the corresponding namespace.\n        // e.g. joint.shapes.basic.Rect searches for joint.shapes.basic.RectView\n        const namespace = this.options.cellViewNamespace\n        const type = `${cell.get('type')  }View`\n        const namespaceViewClass = joint.util.getByPath(namespace, type, '.')\n\n        if (cell.isLink()) {\n            optionalViewClass = this.options.linkView\n            defaultViewClass = joint.dia.LinkView\n        } else {\n            optionalViewClass = this.options.elementView\n            defaultViewClass = joint.dia.ElementView\n        }\n\n        // a) the paper options view is a class (deprecated)\n        //  1. search the namespace for a view\n        //  2. if no view was found, use view from the paper options\n        // b) the paper options view is a function\n        //  1. call the function from the paper options\n        //  2. if no view was return, search the namespace for a view\n        //  3. if no view was found, use the default\n        const ViewClass = (optionalViewClass.prototype instanceof Backbone.View)\n            ? namespaceViewClass || optionalViewClass\n            : optionalViewClass.call(this, cell) || namespaceViewClass || defaultViewClass\n\n        return new ViewClass({\n            model: cell,\n            interactive: this.options.interactive\n        })\n    },\n\n    onCellAdded: function(cell, graph, opt) {\n\n        if (this.options.async && opt.async !== false && joint.util.isNumber(opt.position)) {\n\n            this._asyncCells = this._asyncCells || []\n            this._asyncCells.push(cell)\n\n            if (opt.position == 0) {\n\n                if (this._frameId) throw new Error('another asynchronous rendering in progress')\n\n                this.asyncRenderViews(this._asyncCells, opt)\n                delete this._asyncCells\n            }\n\n        } else {\n\n            this.renderView(cell)\n        }\n    },\n\n    removeView: function(cell) {\n\n        const view = this._views[cell.id]\n\n        if (view) {\n            view.remove()\n            delete this._views[cell.id]\n        }\n\n        return view\n    },\n\n    renderView: function(cell) {\n\n        const view = this._views[cell.id] = this.createViewForModel(cell)\n\n        V(this.viewport).append(view.el)\n        view.paper = this\n        view.render()\n\n        return view\n    },\n\n    onImageDragStart: function() {\n        // This is the only way to prevent image dragging in Firefox that works.\n        // Setting -moz-user-select: none, draggable=\"false\" attribute or user-drag: none didn't help.\n\n        return false\n    },\n\n    beforeRenderViews: function(cells) {\n\n        // Make sure links are always added AFTER elements.\n        // They wouldn't find their sources/targets in the DOM otherwise.\n        cells.sort(function(a) { return (a.isLink()) ? 1 : -1 })\n\n        return cells\n    },\n\n    afterRenderViews: function() {\n\n        this.sortViews()\n    },\n\n    resetViews: function(cellsCollection, opt) {\n\n        // clearing views removes any event listeners\n        this.removeViews()\n\n        let cells = cellsCollection.models.slice()\n\n        // `beforeRenderViews()` can return changed cells array (e.g sorted).\n        cells = this.beforeRenderViews(cells, opt) || cells\n\n        this.cancelRenderViews()\n\n        if (this.options.async) {\n\n            this.asyncRenderViews(cells, opt)\n            // Sort the cells once all elements rendered (see asyncRenderViews()).\n\n        } else {\n\n            for (let i = 0, n = cells.length; i < n; i++) {\n                this.renderView(cells[i])\n            }\n\n            // Sort the cells in the DOM manually as we might have changed the order they\n            // were added to the DOM (see above).\n            this.sortViews()\n        }\n    },\n\n    cancelRenderViews: function() {\n        if (this._frameId) {\n            joint.util.cancelFrame(this._frameId)\n            delete this._frameId\n        }\n    },\n\n    removeViews: function() {\n\n        joint.util.invoke(this._views, 'remove')\n\n        this._views = {}\n    },\n\n    asyncBatchAdded: joint.util.noop,\n\n    asyncRenderViews: function(cells, opt) {\n\n        if (this._frameId) {\n\n            const batchSize = (this.options.async && this.options.async.batchSize) || 50\n            const batchCells = cells.splice(0, batchSize)\n\n            batchCells.forEach(function(cell) {\n\n                // The cell has to be part of the graph.\n                // There is a chance in asynchronous rendering\n                // that a cell was removed before it's rendered to the paper.\n                if (cell.graph === this.model) this.renderView(cell)\n\n            }, this)\n\n            this.asyncBatchAdded()\n        }\n\n        if (!cells.length) {\n\n            // No cells left to render.\n            delete this._frameId\n            this.afterRenderViews(opt)\n            this.trigger('render:done', opt)\n\n        } else {\n\n            // Schedule a next batch to render.\n            this._frameId = joint.util.nextFrame(function() {\n                this.asyncRenderViews(cells, opt)\n            }, this)\n        }\n    },\n\n    sortViews: function() {\n\n        // Run insertion sort algorithm in order to efficiently sort DOM elements according to their\n        // associated model `z` attribute.\n\n        const $cells = $(this.viewport).children('[model-id]')\n        const cells = this.model.get('cells')\n\n        joint.util.sortElements($cells, function(a, b) {\n\n            const cellA = cells.get($(a).attr('model-id'))\n            const cellB = cells.get($(b).attr('model-id'))\n\n            return (cellA.get('z') || 0) > (cellB.get('z') || 0) ? 1 : -1\n        })\n    },\n\n    scale: function(sx, sy, ox, oy) {\n\n        // getter\n        if (sx === undefined) {\n            return V.matrixToScale(this.matrix())\n        }\n\n        // setter\n        if (sy === undefined) {\n            sy = sx\n        }\n        if (ox === undefined) {\n            ox = 0\n            oy = 0\n        }\n\n        const translate = this.translate()\n\n        if (ox || oy || translate.tx || translate.ty) {\n            const newTx = translate.tx - ox * (sx - 1)\n            const newTy = translate.ty - oy * (sy - 1)\n            this.translate(newTx, newTy)\n        }\n\n        const ctm = this.matrix()\n        ctm.a = sx || 0\n        ctm.d = sy || 0\n\n        this.matrix(ctm)\n\n        this.trigger('scale', sx, sy, ox, oy)\n\n        return this\n    },\n\n    // Experimental - do not use in production.\n    rotate: function(angle, cx, cy) {\n\n        // getter\n        if (angle === undefined) {\n            return V.matrixToRotate(this.matrix())\n        }\n\n        // setter\n\n        // If the origin is not set explicitely, rotate around the center. Note that\n        // we must use the plain bounding box (`this.el.getBBox()` instead of the one that gives us\n        // the real bounding box (`bbox()`) including transformations).\n        if (cx === undefined) {\n            const bbox = this.viewport.getBBox()\n            cx = bbox.width / 2\n            cy = bbox.height / 2\n        }\n\n        const ctm = this.matrix().translate(cx,cy).rotate(angle).translate(-cx,-cy)\n        this.matrix(ctm)\n\n        return this\n    },\n\n    translate: function(tx, ty) {\n\n        // getter\n        if (tx === undefined) {\n            return V.matrixToTranslate(this.matrix())\n        }\n\n        // setter\n\n        const ctm = this.matrix()\n        ctm.e = tx || 0\n        ctm.f = ty || 0\n\n        this.matrix(ctm)\n\n        const newTranslate = this.translate()\n        const {origin} = this.options\n        origin.x = newTranslate.tx\n        origin.y = newTranslate.ty\n\n        this.trigger('translate', newTranslate.tx, newTranslate.ty)\n\n        if (this.options.drawGrid) {\n            this.drawGrid()\n        }\n\n        return this\n    },\n\n    // Find the first view climbing up the DOM tree starting at element `el`. Note that `el` can also\n    // be a selector or a jQuery object.\n    findView: function($el) {\n\n        let el = joint.util.isString($el)\n            ? this.viewport.querySelector($el)\n            : $el instanceof $ ? $el[0] : $el\n\n        while (el && el !== this.el && el !== document) {\n\n            const id = el.getAttribute('model-id')\n            if (id) return this._views[id]\n\n            el = el.parentNode\n        }\n\n        return undefined\n    },\n\n    // Find a view for a model `cell`. `cell` can also be a string or number representing a model `id`.\n    findViewByModel: function(cell) {\n\n        const id = (joint.util.isString(cell) || joint.util.isNumber(cell)) ? cell : (cell && cell.id)\n\n        return this._views[id]\n    },\n\n    // Find all views at given point\n    findViewsFromPoint: function(p) {\n\n        p = g.point(p)\n\n        const views = this.model.getElements().map(this.findViewByModel, this)\n\n        return views.filter(function(view) {\n            return view && view.vel.getBBox({ target: this.viewport }).containsPoint(p)\n        }, this)\n    },\n\n    // Find all views in given area\n    findViewsInArea: function(rect, opt) {\n\n        opt = joint.util.defaults(opt || {}, { strict: false })\n        rect = g.rect(rect)\n\n        const views = this.model.getElements().map(this.findViewByModel, this)\n        const method = opt.strict ? 'containsRect' : 'intersect'\n\n        return views.filter(function(view) {\n            return view && rect[method](view.vel.getBBox({ target: this.viewport }))\n        }, this)\n    },\n\n    removeTools: function() {\n        joint.dia.CellView.dispatchToolsEvent(this, 'remove')\n        return this\n    },\n\n    hideTools: function() {\n        joint.dia.CellView.dispatchToolsEvent(this, 'hide')\n        return this\n    },\n\n    showTools: function() {\n        joint.dia.CellView.dispatchToolsEvent(this, 'show')\n        return this\n    },\n\n    getModelById: function(id) {\n\n        return this.model.getCell(id)\n    },\n\n    snapToGrid: function(x, y) {\n\n        // Convert global coordinates to the local ones of the `viewport`. Otherwise,\n        // improper transformation would be applied when the viewport gets transformed (scaled/rotated).\n        return this.clientToLocalPoint(x, y).snapToGrid(this.options.gridSize)\n    },\n\n    localToPaperPoint: function(x, y) {\n        // allow `x` to be a point and `y` undefined\n        const localPoint = g.Point(x, y)\n        const paperPoint = V.transformPoint(localPoint, this.matrix())\n        return g.Point(paperPoint)\n    },\n\n    localToPaperRect: function(x, y, width, height) {\n        // allow `x` to be a rectangle and rest arguments undefined\n        const localRect = g.Rect(x, y)\n        const paperRect = V.transformRect(localRect, this.matrix())\n        return g.Rect(paperRect)\n    },\n\n    paperToLocalPoint: function(x, y) {\n        // allow `x` to be a point and `y` undefined\n        const paperPoint = g.Point(x, y)\n        const localPoint = V.transformPoint(paperPoint, this.matrix().inverse())\n        return g.Point(localPoint)\n    },\n\n    paperToLocalRect: function(x, y, width, height) {\n        // allow `x` to be a rectangle and rest arguments undefined\n        const paperRect = g.Rect(x, y, width, height)\n        const localRect = V.transformRect(paperRect, this.matrix().inverse())\n        return g.Rect(localRect)\n    },\n\n    localToClientPoint: function(x, y) {\n        // allow `x` to be a point and `y` undefined\n        const localPoint = g.Point(x, y)\n        const clientPoint = V.transformPoint(localPoint, this.clientMatrix())\n        return g.Point(clientPoint)\n    },\n\n    localToClientRect: function(x, y, width, height) {\n        // allow `x` to be a point and `y` undefined\n        const localRect = g.Rect(x, y, width, height)\n        const clientRect = V.transformRect(localRect, this.clientMatrix())\n        return g.Rect(clientRect)\n    },\n\n    // Transform client coordinates to the paper local coordinates.\n    // Useful when you have a mouse event object and you'd like to get coordinates\n    // inside the paper that correspond to `evt.clientX` and `evt.clientY` point.\n    // Example: var localPoint = paper.clientToLocalPoint({ x: evt.clientX, y: evt.clientY });\n    clientToLocalPoint: function(x, y) {\n        // allow `x` to be a point and `y` undefined\n        const clientPoint = g.Point(x, y)\n        const localPoint = V.transformPoint(clientPoint, this.clientMatrix().inverse())\n        return g.Point(localPoint)\n    },\n\n    clientToLocalRect: function(x, y, width, height) {\n        // allow `x` to be a point and `y` undefined\n        const clientRect = g.Rect(x, y, width, height)\n        const localRect = V.transformRect(clientRect, this.clientMatrix().inverse())\n        return g.Rect(localRect)\n    },\n\n    localToPagePoint: function(x, y) {\n\n        return this.localToPaperPoint(x, y).offset(this.pageOffset())\n    },\n\n    localToPageRect: function(x, y, width, height) {\n\n        return this.localToPaperRect(x, y, width, height).moveAndExpand(this.pageOffset())\n    },\n\n    pageToLocalPoint: function(x, y) {\n\n        const pagePoint = g.Point(x, y)\n        const paperPoint = pagePoint.difference(this.pageOffset())\n        return this.paperToLocalPoint(paperPoint)\n    },\n\n    pageToLocalRect: function(x, y, width, height) {\n\n        const pageOffset = this.pageOffset()\n        const paperRect = g.Rect(x, y, width, height)\n        paperRect.x -= pageOffset.x\n        paperRect.y -= pageOffset.y\n        return this.paperToLocalRect(paperRect)\n    },\n\n    clientOffset: function() {\n\n        const clientRect = this.svg.getBoundingClientRect()\n        return g.Point(clientRect.left, clientRect.top)\n    },\n\n    pageOffset: function() {\n\n        return this.clientOffset().offset(window.scrollX, window.scrollY)\n    },\n\n    linkAllowed: function(linkView) {\n\n        if (!(linkView instanceof joint.dia.LinkView)) {\n            throw new Error('Must provide a linkView.')\n        }\n\n        const link = linkView.model\n        const paperOptions = this.options\n        const graph = this.model\n        const ns = graph.constructor.validations\n\n        if (!paperOptions.multiLinks) {\n            if (!ns.multiLinks.call(this, graph, link)) return false\n        }\n\n        if (!paperOptions.linkPinning) {\n            // Link pinning is not allowed and the link is not connected to the target.\n            if (!ns.linkPinning.call(this, graph, link)) return false\n        }\n\n        if (typeof paperOptions.allowLink === 'function') {\n            if (!paperOptions.allowLink.call(this, linkView, this)) return false\n        }\n\n        return true\n    },\n\n    getDefaultLink: function(cellView, magnet) {\n\n        return joint.util.isFunction(this.options.defaultLink)\n        // default link is a function producing link model\n            ? this.options.defaultLink.call(this, cellView, magnet)\n        // default link is the Backbone model\n            : this.options.defaultLink.clone()\n    },\n\n    // Cell highlighting.\n    // ------------------\n\n    resolveHighlighter: function(opt) {\n\n        opt = opt || {}\n        let highlighterDef = opt.highlighter\n        const paperOpt = this.options\n\n        /*\n            Expecting opt.highlighter to have the following structure:\n            {\n                name: 'highlighter-name',\n                options: {\n                    some: 'value'\n                }\n            }\n        */\n        if (highlighterDef === undefined) {\n\n            // check for built-in types\n            const type = ['embedding', 'connecting', 'magnetAvailability', 'elementAvailability'].find(function(type) {\n                return !!opt[type]\n            })\n\n            highlighterDef = (type && paperOpt.highlighting[type]) || paperOpt.highlighting.default\n        }\n\n        // Do nothing if opt.highlighter is falsey.\n        // This allows the case to not highlight cell(s) in certain cases.\n        // For example, if you want to NOT highlight when embedding elements.\n        if (!highlighterDef) return false\n\n        // Allow specifying a highlighter by name.\n        if (joint.util.isString(highlighterDef)) {\n            highlighterDef = {\n                name: highlighterDef\n            }\n        }\n\n        const {name} = highlighterDef\n        const highlighter = paperOpt.highlighterNamespace[name]\n\n        // Highlighter validation\n        if (!highlighter) {\n            throw new Error(`Unknown highlighter (\"${  name  }\")`)\n        }\n        if (typeof highlighter.highlight !== 'function') {\n            throw new Error(`Highlighter (\"${  name  }\") is missing required highlight() method`)\n        }\n        if (typeof highlighter.unhighlight !== 'function') {\n            throw new Error(`Highlighter (\"${  name  }\") is missing required unhighlight() method`)\n        }\n\n        return {\n            highlighter: highlighter,\n            options: highlighterDef.options || {},\n            name: name\n        }\n    },\n\n    onCellHighlight: function(cellView, magnetEl, opt) {\n\n        opt = this.resolveHighlighter(opt)\n        if (!opt) return\n        if (!magnetEl.id) {\n            magnetEl.id = V.uniqueId()\n        }\n\n        const key = opt.name + magnetEl.id + JSON.stringify(opt.options)\n        if (!this._highlights[key]) {\n\n            const {highlighter} = opt\n            highlighter.highlight(cellView, magnetEl, joint.util.assign({}, opt.options))\n\n            this._highlights[key] = {\n                cellView: cellView,\n                magnetEl: magnetEl,\n                opt: opt.options,\n                highlighter: highlighter\n            }\n        }\n    },\n\n    onCellUnhighlight: function(cellView, magnetEl, opt) {\n\n        opt = this.resolveHighlighter(opt)\n        if (!opt) return\n\n        const key = opt.name + magnetEl.id + JSON.stringify(opt.options)\n        const highlight = this._highlights[key]\n        if (highlight) {\n\n            // Use the cellView and magnetEl that were used by the highlighter.highlight() method.\n            highlight.highlighter.unhighlight(highlight.cellView, highlight.magnetEl, highlight.opt)\n\n            this._highlights[key] = null\n        }\n    },\n\n    // Interaction.\n    // ------------\n\n    pointerdblclick: function(evt) {\n\n        evt.preventDefault()\n\n        evt = joint.util.normalizeEvent(evt)\n\n        const view = this.findView(evt.target)\n        if (this.guard(evt, view)) return\n\n        const localPoint = this.snapToGrid({ x: evt.clientX, y: evt.clientY })\n\n        if (view) {\n            view.pointerdblclick(evt, localPoint.x, localPoint.y)\n\n        } else {\n            this.trigger('blank:pointerdblclick', evt, localPoint.x, localPoint.y)\n        }\n    },\n\n    pointerclick: function(evt) {\n\n        // Trigger event only if mouse has not moved.\n        if (this._mousemoved <= this.options.clickThreshold) {\n\n            evt = joint.util.normalizeEvent(evt)\n\n            const view = this.findView(evt.target)\n            if (this.guard(evt, view)) return\n\n            const localPoint = this.snapToGrid({ x: evt.clientX, y: evt.clientY })\n\n            if (view) {\n                view.pointerclick(evt, localPoint.x, localPoint.y)\n\n            } else {\n                this.trigger('blank:pointerclick', evt, localPoint.x, localPoint.y)\n            }\n        }\n    },\n\n    contextmenu: function(evt) {\n\n        if (this.options.preventContextMenu) evt.preventDefault()\n\n        evt = joint.util.normalizeEvent(evt)\n\n        const view = this.findView(evt.target)\n        if (this.guard(evt, view)) return\n\n        const localPoint = this.snapToGrid({ x: evt.clientX, y: evt.clientY })\n\n        if (view) {\n            view.contextmenu(evt, localPoint.x, localPoint.y)\n\n        } else {\n            this.trigger('blank:contextmenu', evt, localPoint.x, localPoint.y)\n        }\n    },\n\n    pointerdown: function(evt) {\n\n        evt = joint.util.normalizeEvent(evt)\n\n        const view = this.findView(evt.target)\n        if (this.guard(evt, view)) return\n\n        const localPoint = this.snapToGrid({ x: evt.clientX, y: evt.clientY })\n\n        if (view) {\n\n            evt.preventDefault()\n            view.pointerdown(evt, localPoint.x, localPoint.y)\n\n        } else {\n\n            if (this.options.preventDefaultBlankAction) evt.preventDefault()\n\n            this.trigger('blank:pointerdown', evt, localPoint.x, localPoint.y)\n        }\n\n        this.delegateDragEvents(view, evt.data)\n    },\n\n    pointermove: function(evt) {\n\n        evt.preventDefault()\n\n        // mouse moved counter\n        const data = this.eventData(evt)\n        data.mousemoved || (data.mousemoved = 0)\n        const mousemoved = ++data.mousemoved\n        if (mousemoved <= this.options.moveThreshold) return\n\n        evt = joint.util.normalizeEvent(evt)\n\n        const localPoint = this.snapToGrid({ x: evt.clientX, y: evt.clientY })\n\n        const view = data.sourceView\n        if (view) {\n            view.pointermove(evt, localPoint.x, localPoint.y)\n        } else {\n            this.trigger('blank:pointermove', evt, localPoint.x, localPoint.y)\n        }\n\n        this.eventData(evt, data)\n    },\n\n    pointerup: function(evt) {\n\n        this.undelegateDocumentEvents()\n\n        evt = joint.util.normalizeEvent(evt)\n\n        const localPoint = this.snapToGrid({ x: evt.clientX, y: evt.clientY })\n\n        const view = this.eventData(evt).sourceView\n        if (view) {\n            view.pointerup(evt, localPoint.x, localPoint.y)\n        } else {\n            this.trigger('blank:pointerup', evt, localPoint.x, localPoint.y)\n        }\n\n        this.delegateEvents()\n    },\n\n    mouseover: function(evt) {\n\n        evt = joint.util.normalizeEvent(evt)\n\n        const view = this.findView(evt.target)\n        if (this.guard(evt, view)) return\n\n        if (view) {\n            view.mouseover(evt)\n\n        } else {\n            if (this.el === evt.target) return // prevent border of paper from triggering this\n            this.trigger('blank:mouseover', evt)\n        }\n    },\n\n    mouseout: function(evt) {\n\n        evt = joint.util.normalizeEvent(evt)\n\n        const view = this.findView(evt.target)\n        if (this.guard(evt, view)) return\n\n        if (view) {\n            view.mouseout(evt)\n\n        } else {\n            if (this.el === evt.target) return // prevent border of paper from triggering this\n            this.trigger('blank:mouseout', evt)\n        }\n    },\n\n    mouseenter: function(evt) {\n\n        evt = joint.util.normalizeEvent(evt)\n\n        const view = this.findView(evt.target)\n        if (this.guard(evt, view)) return\n        const relatedView = this.findView(evt.relatedTarget)\n        if (view) {\n            // mouse moved from tool over view?\n            if (relatedView === view) return\n            view.mouseenter(evt)\n        } else {\n            if (relatedView) return\n            // `paper` (more descriptive), not `blank`\n            this.trigger('paper:mouseenter', evt)\n        }\n    },\n\n    mouseleave: function(evt) {\n\n        evt = joint.util.normalizeEvent(evt)\n\n        const view = this.findView(evt.target)\n        if (this.guard(evt, view)) return\n        const relatedView = this.findView(evt.relatedTarget)\n        if (view) {\n            // mouse moved from view over tool?\n            if (relatedView === view) return\n            view.mouseleave(evt)\n        } else {\n            if (relatedView) return\n            // `paper` (more descriptive), not `blank`\n            this.trigger('paper:mouseleave', evt)\n        }\n    },\n\n    mousewheel: function(evt) {\n\n        evt = joint.util.normalizeEvent(evt)\n\n        const view = this.findView(evt.target)\n        if (this.guard(evt, view)) return\n\n        const {originalEvent} = evt\n        const localPoint = this.snapToGrid({ x: originalEvent.clientX, y: originalEvent.clientY })\n        const delta = Math.max(-1, Math.min(1, (originalEvent.wheelDelta || -originalEvent.detail)))\n\n        if (view) {\n            view.mousewheel(evt, localPoint.x, localPoint.y, delta)\n\n        } else {\n            this.trigger('blank:mousewheel', evt, localPoint.x, localPoint.y, delta)\n        }\n    },\n\n    onevent: function(evt) {\n\n        const eventNode = evt.currentTarget\n        const eventName = eventNode.getAttribute('event')\n        if (eventName) {\n            const view = this.findView(eventNode)\n            if (view) {\n\n                evt = joint.util.normalizeEvent(evt)\n                if (this.guard(evt, view)) return\n\n                const localPoint = this.snapToGrid({ x: evt.clientX, y: evt.clientY })\n                view.onevent(evt, eventName, localPoint.x, localPoint.y)\n            }\n        }\n    },\n\n    onmagnet: function(evt) {\n\n        const magnetNode = evt.currentTarget\n        const magnetValue = magnetNode.getAttribute('magnet')\n        if (magnetValue) {\n            const view = this.findView(magnetNode)\n            if (view) {\n\n                evt = joint.util.normalizeEvent(evt)\n                if (this.guard(evt, view)) return\n                if (!this.options.validateMagnet(view, magnetNode)) return\n\n                const localPoint = this.snapToGrid(evt.clientX, evt.clientY)\n                view.onmagnet(evt, localPoint.x, localPoint.y)\n            }\n        }\n    },\n\n    onlabel: function(evt) {\n\n        const labelNode = evt.currentTarget\n        const view = this.findView(labelNode)\n        if (view) {\n\n            evt = joint.util.normalizeEvent(evt)\n            if (this.guard(evt, view)) return\n\n            const localPoint = this.snapToGrid(evt.clientX, evt.clientY)\n            view.onlabel(evt, localPoint.x, localPoint.y)\n        }\n    },\n\n    delegateDragEvents: function(view, data) {\n\n        data || (data = {})\n        this.eventData({ data: data }, { sourceView: view || null, mousemoved: 0 })\n        this.delegateDocumentEvents(null, data)\n        this.undelegateEvents()\n    },\n\n    // Guard the specified event. If the event is not interesting, guard returns `true`.\n    // Otherwise, it returns `false`.\n    guard: function(evt, view) {\n\n        if (evt.type === 'mousedown' && evt.button === 2) {\n            // handled as `contextmenu` type\n            return true\n        }\n\n        if (this.options.guard && this.options.guard(evt, view)) {\n            return true\n        }\n\n        if (evt.data && evt.data.guarded !== undefined) {\n            return evt.data.guarded\n        }\n\n        if (view && view.model && (view.model instanceof joint.dia.Cell)) {\n            return false\n        }\n\n        if (this.svg === evt.target || this.el === evt.target || $.contains(this.svg, evt.target)) {\n            return false\n        }\n\n        return true    // Event guarded. Paper should not react on it in any way.\n    },\n\n    setGridSize: function(gridSize) {\n\n        this.options.gridSize = gridSize\n\n        if (this.options.drawGrid) {\n            this.drawGrid()\n        }\n\n        return this\n    },\n\n    clearGrid: function() {\n\n        if (this.$grid) {\n            this.$grid.css('backgroundImage', 'none')\n        }\n        return this\n    },\n\n    _getGriRefs: function() {\n\n        if (!this._gridCache) {\n\n            this._gridCache = {\n                root: V('svg', { width: '100%', height: '100%' }, V('defs')),\n                patterns: {},\n                add: function(id, vel) {\n                    V(this.root.node.childNodes[0]).append(vel)\n                    this.patterns[id] = vel\n                    this.root.append(V('rect', { width: '100%', height: '100%', fill: `url(#${  id  })` }))\n                },\n                get: function(id) {\n                    return  this.patterns[id]\n                },\n                exist: function(id) {\n                    return this.patterns[id] !== undefined\n                }\n            }\n        }\n\n        return this._gridCache\n    },\n\n    setGrid: function(drawGrid) {\n\n        this.clearGrid()\n\n        this._gridCache = null\n        this._gridSettings = []\n\n        const optionsList = Array.isArray(drawGrid) ? drawGrid : [drawGrid || {}]\n        optionsList.forEach(function(item) {\n            this._gridSettings.push.apply(this._gridSettings, this._resolveDrawGridOption(item))\n        }, this)\n        return this\n    },\n\n    _resolveDrawGridOption: function(opt) {\n\n        const namespace = this.constructor.gridPatterns\n        if (joint.util.isString(opt) && Array.isArray(namespace[opt])) {\n            return namespace[opt].map(function(item) {\n                return joint.util.assign({}, item)\n            })\n        }\n\n        const options = opt || { args: [{}] }\n        const isArray = Array.isArray(options)\n        let {name} = options\n\n        if (!isArray && !name && !options.markup ) {\n            name = 'dot'\n        }\n\n        if (name && Array.isArray(namespace[name])) {\n            const pattern = namespace[name].map(function(item) {\n                return joint.util.assign({}, item)\n            })\n\n            const args = Array.isArray(options.args) ? options.args : [options.args || {}]\n\n            joint.util.defaults(args[0], joint.util.omit(opt, 'args'))\n            for (let i = 0; i < args.length; i++) {\n                if (pattern[i]) {\n                    joint.util.assign(pattern[i], args[i])\n                }\n            }\n            return pattern\n        }\n\n        return isArray ? options : [options]\n    },\n\n    drawGrid: function(opt) {\n\n        const {gridSize} = this.options\n        if (gridSize <= 1) {\n            return this.clearGrid()\n        }\n\n        const localOptions = Array.isArray(opt) ? opt : [opt]\n\n        const ctm = this.matrix()\n        const refs = this._getGriRefs()\n\n        this._gridSettings.forEach(function(gridLayerSetting, index) {\n\n            const id = `pattern_${   index}`\n            const options = joint.util.merge(gridLayerSetting, localOptions[index], {\n                sx: ctm.a || 1,\n                sy: ctm.d || 1,\n                ox: ctm.e || 0,\n                oy: ctm.f || 0\n            })\n\n            options.width = gridSize * (ctm.a || 1) * (options.scaleFactor || 1)\n            options.height = gridSize * (ctm.d || 1) * (options.scaleFactor || 1)\n\n            if (!refs.exist(id)) {\n                refs.add(id, V('pattern', { id: id, patternUnits: 'userSpaceOnUse' }, V(options.markup)))\n            }\n\n            const patternDefVel = refs.get(id)\n\n            if (joint.util.isFunction(options.update)) {\n                options.update(patternDefVel.node.childNodes[0], options)\n            }\n\n            let x = options.ox % options.width\n            if (x < 0) x += options.width\n\n            let y = options.oy % options.height\n            if (y < 0) y += options.height\n\n            patternDefVel.attr({\n                x: x,\n                y: y,\n                width: options.width,\n                height: options.height\n            })\n        })\n\n        let patternUri = new XMLSerializer().serializeToString(refs.root.node)\n        patternUri = `url(data:image/svg+xml;base64,${  btoa(patternUri)  })`\n\n        this.$grid.css('backgroundImage', patternUri)\n\n        return this\n    },\n\n    updateBackgroundImage: function(opt) {\n\n        opt = opt || {}\n\n        let backgroundPosition = opt.position || 'center'\n        let backgroundSize = opt.size || 'auto auto'\n\n        const currentScale = this.scale()\n        const currentTranslate = this.translate()\n\n        // backgroundPosition\n        if (joint.util.isObject(backgroundPosition)) {\n            const x = currentTranslate.tx + (currentScale.sx * (backgroundPosition.x || 0))\n            const y = currentTranslate.ty + (currentScale.sy * (backgroundPosition.y || 0))\n            backgroundPosition = `${x  }px ${  y  }px`\n        }\n\n        // backgroundSize\n        if (joint.util.isObject(backgroundSize)) {\n            backgroundSize = g.rect(backgroundSize).scale(currentScale.sx, currentScale.sy)\n            backgroundSize = `${backgroundSize.width  }px ${  backgroundSize.height  }px`\n        }\n\n        this.$background.css({\n            backgroundSize: backgroundSize,\n            backgroundPosition: backgroundPosition\n        })\n    },\n\n    drawBackgroundImage: function(img, opt) {\n\n        // Clear the background image if no image provided\n        if (!(img instanceof HTMLImageElement)) {\n            this.$background.css('backgroundImage', '')\n            return\n        }\n\n        opt = opt || {}\n\n        let backgroundImage\n        const backgroundSize = opt.size\n        let backgroundRepeat = opt.repeat || 'no-repeat'\n        const backgroundOpacity = opt.opacity || 1\n        const backgroundQuality = Math.abs(opt.quality) || 1\n        const backgroundPattern = this.constructor.backgroundPatterns[joint.util.camelCase(backgroundRepeat)]\n\n        if (joint.util.isFunction(backgroundPattern)) {\n            // 'flip-x', 'flip-y', 'flip-xy', 'watermark' and custom\n            img.width *= backgroundQuality\n            img.height *= backgroundQuality\n            const canvas = backgroundPattern(img, opt)\n            if (!(canvas instanceof HTMLCanvasElement)) {\n                throw new Error('dia.Paper: background pattern must return an HTML Canvas instance')\n            }\n\n            backgroundImage = canvas.toDataURL('image/png')\n            backgroundRepeat = 'repeat'\n            if (joint.util.isObject(backgroundSize)) {\n                // recalculate the tile size if an object passed in\n                backgroundSize.width *= canvas.width / img.width\n                backgroundSize.height *= canvas.height / img.height\n            } else if (backgroundSize === undefined) {\n                // calcule the tile size if no provided\n                opt.size = {\n                    width: canvas.width / backgroundQuality,\n                    height: canvas.height / backgroundQuality\n                }\n            }\n        } else {\n            // backgroundRepeat:\n            // no-repeat', 'round', 'space', 'repeat', 'repeat-x', 'repeat-y'\n            backgroundImage = img.src\n            if (backgroundSize === undefined) {\n                // pass the image size for  the backgroundSize if no size provided\n                opt.size = {\n                    width: img.width,\n                    height: img.height\n                }\n            }\n        }\n\n        this.$background.css({\n            opacity: backgroundOpacity,\n            backgroundRepeat: backgroundRepeat,\n            backgroundImage: `url(${  backgroundImage  })`\n        })\n\n        this.updateBackgroundImage(opt)\n    },\n\n    updateBackgroundColor: function(color) {\n\n        this.$el.css('backgroundColor', color || '')\n    },\n\n    drawBackground: function(opt) {\n\n        opt = opt || {}\n\n        this.updateBackgroundColor(opt.color)\n\n        if (opt.image) {\n            opt = this._background = joint.util.cloneDeep(opt)\n            const img = document.createElement('img')\n            img.onload = this.drawBackgroundImage.bind(this, img, opt)\n            img.src = opt.image\n        } else {\n            this.drawBackgroundImage(null)\n            this._background = null\n        }\n\n        return this\n    },\n\n    setInteractivity: function(value) {\n\n        this.options.interactive = value\n\n        joint.util.invoke(this._views, 'setInteractivity', value)\n    },\n\n    // Paper definitions.\n    // ------------------\n\n    isDefined: function(defId) {\n\n        return !!this.svg.getElementById(defId)\n    },\n\n    defineFilter: function(filter) {\n\n        if (!joint.util.isObject(filter)) {\n            throw new TypeError('dia.Paper: defineFilter() requires 1. argument to be an object.')\n        }\n\n        let filterId = filter.id\n        const {name} = filter\n        // Generate a hash code from the stringified filter definition. This gives us\n        // a unique filter ID for different definitions.\n        if (!filterId) {\n            filterId = name + this.svg.id + joint.util.hashCode(JSON.stringify(filter))\n        }\n        // If the filter already exists in the document,\n        // we're done and we can just use it (reference it using `url()`).\n        // If not, create one.\n        if (!this.isDefined(filterId)) {\n\n            const namespace = joint.util.filter\n            const filterSVGString = namespace[name] && namespace[name](filter.args || {})\n            if (!filterSVGString) {\n                throw new Error(`Non-existing filter ${  name}`)\n            }\n\n            // Set the filter area to be 3x the bounding box of the cell\n            // and center the filter around the cell.\n            const filterAttrs = joint.util.assign({\n                filterUnits: 'objectBoundingBox',\n                x: -1,\n                y: -1,\n                width: 3,\n                height: 3\n            }, filter.attrs, {\n                id: filterId\n            })\n\n            V(filterSVGString, filterAttrs).appendTo(this.defs)\n        }\n\n        return filterId\n    },\n\n    defineGradient: function(gradient) {\n\n        if (!joint.util.isObject(gradient)) {\n            throw new TypeError('dia.Paper: defineGradient() requires 1. argument to be an object.')\n        }\n\n        let gradientId = gradient.id\n        const {type} = gradient\n        const {stops} = gradient\n        // Generate a hash code from the stringified filter definition. This gives us\n        // a unique filter ID for different definitions.\n        if (!gradientId) {\n            gradientId = type + this.svg.id + joint.util.hashCode(JSON.stringify(gradient))\n        }\n        // If the gradient already exists in the document,\n        // we're done and we can just use it (reference it using `url()`).\n        // If not, create one.\n        if (!this.isDefined(gradientId)) {\n\n            const stopTemplate = joint.util.template('<stop offset=\"${offset}\" stop-color=\"${color}\" stop-opacity=\"${opacity}\"/>')\n            const gradientStopsStrings = joint.util.toArray(stops).map(function(stop) {\n                return stopTemplate({\n                    offset: stop.offset,\n                    color: stop.color,\n                    opacity: Number.isFinite(stop.opacity) ? stop.opacity : 1\n                })\n            })\n\n            const gradientSVGString = [\n                `<${  type  }>`,\n                gradientStopsStrings.join(''),\n                `</${  type  }>`\n            ].join('')\n\n            const gradientAttrs = joint.util.assign({ id: gradientId }, gradient.attrs)\n\n            V(gradientSVGString, gradientAttrs).appendTo(this.defs)\n        }\n\n        return gradientId\n    },\n\n    defineMarker: function(marker) {\n\n        if (!joint.util.isObject(marker)) {\n            throw new TypeError('dia.Paper: defineMarker() requires 1. argument to be an object.')\n        }\n\n        let markerId = marker.id\n\n        // Generate a hash code from the stringified filter definition. This gives us\n        // a unique filter ID for different definitions.\n        if (!markerId) {\n            markerId = this.svg.id + joint.util.hashCode(JSON.stringify(marker))\n        }\n\n        if (!this.isDefined(markerId)) {\n\n            const attrs = joint.util.omit(marker, 'type', 'userSpaceOnUse')\n            const pathMarker = V('marker', {\n                id: markerId,\n                orient: 'auto',\n                overflow: 'visible',\n                markerUnits: marker.markerUnits || 'userSpaceOnUse'\n            }, [\n                V(marker.type || 'path', attrs)\n            ])\n\n            pathMarker.appendTo(this.defs)\n        }\n\n        return markerId\n    }\n}, {\n\n    backgroundPatterns: {\n\n        flipXy: function(img) {\n            // d b\n            // q p\n\n            const canvas = document.createElement('canvas')\n            const imgWidth = img.width\n            const imgHeight = img.height\n\n            canvas.width = 2 * imgWidth\n            canvas.height = 2 * imgHeight\n\n            const ctx = canvas.getContext('2d')\n            // top-left image\n            ctx.drawImage(img, 0, 0, imgWidth, imgHeight)\n            // xy-flipped bottom-right image\n            ctx.setTransform(-1, 0, 0, -1, canvas.width, canvas.height)\n            ctx.drawImage(img, 0, 0, imgWidth, imgHeight)\n            // x-flipped top-right image\n            ctx.setTransform(-1, 0, 0, 1, canvas.width, 0)\n            ctx.drawImage(img, 0, 0, imgWidth, imgHeight)\n            // y-flipped bottom-left image\n            ctx.setTransform(1, 0, 0, -1, 0, canvas.height)\n            ctx.drawImage(img, 0, 0, imgWidth, imgHeight)\n\n            return canvas\n        },\n\n        flipX: function(img) {\n            // d b\n            // d b\n\n            const canvas = document.createElement('canvas')\n            const imgWidth = img.width\n            const imgHeight = img.height\n\n            canvas.width = imgWidth * 2\n            canvas.height = imgHeight\n\n            const ctx = canvas.getContext('2d')\n            // left image\n            ctx.drawImage(img, 0, 0, imgWidth, imgHeight)\n            // flipped right image\n            ctx.translate(2 * imgWidth, 0)\n            ctx.scale(-1, 1)\n            ctx.drawImage(img, 0, 0, imgWidth, imgHeight)\n\n            return canvas\n        },\n\n        flipY: function(img) {\n            // d d\n            // q q\n\n            const canvas = document.createElement('canvas')\n            const imgWidth = img.width\n            const imgHeight = img.height\n\n            canvas.width = imgWidth\n            canvas.height = imgHeight * 2\n\n            const ctx = canvas.getContext('2d')\n            // top image\n            ctx.drawImage(img, 0, 0, imgWidth, imgHeight)\n            // flipped bottom image\n            ctx.translate(0, 2 * imgHeight)\n            ctx.scale(1, -1)\n            ctx.drawImage(img, 0, 0, imgWidth, imgHeight)\n\n            return canvas\n        },\n\n        watermark: function(img, opt) {\n            //   d\n            // d\n\n            opt = opt || {}\n\n            const imgWidth = img.width\n            const imgHeight = img.height\n\n            const canvas = document.createElement('canvas')\n            canvas.width = imgWidth * 3\n            canvas.height = imgHeight * 3\n\n            const ctx = canvas.getContext('2d')\n            const angle = joint.util.isNumber(opt.watermarkAngle) ? -opt.watermarkAngle : -20\n            const radians = g.toRad(angle)\n            const stepX = canvas.width / 4\n            const stepY = canvas.height / 4\n\n            for (let i = 0; i < 4; i ++) {\n                for (let j = 0; j < 4; j++) {\n                    if ((i + j) % 2 > 0) {\n                        // reset the current transformations\n                        ctx.setTransform(1, 0, 0, 1, (2 * i - 1) * stepX, (2 * j - 1)  * stepY)\n                        ctx.rotate(radians)\n                        ctx.drawImage(img, -imgWidth / 2, -imgHeight / 2, imgWidth, imgHeight)\n                    }\n                }\n            }\n\n            return canvas\n        }\n    },\n\n    gridPatterns: {\n        dot: [{\n            color: '#AAAAAA',\n            thickness: 1,\n            markup: 'rect',\n            update: function(el, opt) {\n                V(el).attr({\n                    width: opt.thickness * opt.sx,\n                    height: opt.thickness * opt.sy,\n                    fill: opt.color\n                })\n            }\n        }],\n        fixedDot: [{\n            color: '#AAAAAA',\n            thickness: 1,\n            markup: 'rect',\n            update: function(el, opt) {\n                const size = opt.sx <= 1 ? opt.thickness * opt.sx : opt.thickness\n                V(el).attr({ width: size, height: size, fill: opt.color })\n            }\n        }],\n        mesh: [{\n            color: '#AAAAAA',\n            thickness: 1,\n            markup: 'path',\n            update: function(el, opt) {\n\n                let d\n                const {width} = opt\n                const {height} = opt\n                const {thickness} = opt\n\n                if (width - thickness >= 0 && height - thickness >= 0) {\n                    d = ['M', width, 0, 'H0 M0 0 V0', height].join(' ')\n                } else {\n                    d = 'M 0 0 0 0'\n                }\n\n                V(el).attr({ d: d, stroke: opt.color, 'stroke-width': opt.thickness })\n            }\n        }],\n        doubleMesh: [{\n            color: '#AAAAAA',\n            thickness: 1,\n            markup: 'path',\n            update: function(el, opt) {\n\n                let d\n                const {width} = opt\n                const {height} = opt\n                const {thickness} = opt\n\n                if (width - thickness >= 0 && height - thickness >= 0) {\n                    d = ['M', width, 0, 'H0 M0 0 V0', height].join(' ')\n                } else {\n                    d = 'M 0 0 0 0'\n                }\n\n                V(el).attr({ d: d, stroke: opt.color, 'stroke-width': opt.thickness })\n            }\n        }, {\n            color: '#000000',\n            thickness: 3,\n            scaleFactor: 4,\n            markup: 'path',\n            update: function(el, opt) {\n\n                let d\n                const {width} = opt\n                const {height} = opt\n                const {thickness} = opt\n\n                if (width - thickness >= 0 && height - thickness >= 0) {\n                    d = ['M', width, 0, 'H0 M0 0 V0', height].join(' ')\n                } else {\n                    d = 'M 0 0 0 0'\n                }\n\n                V(el).attr({ d: d, stroke: opt.color, 'stroke-width': opt.thickness })\n            }\n        }]\n    }\n});\n\n(function(joint, util) {\n\n    const PortData = function(data) {\n\n        const clonedData = util.cloneDeep(data) || {}\n        this.ports = []\n        this.groups = {}\n        this.portLayoutNamespace = joint.layout.Port\n        this.portLabelLayoutNamespace = joint.layout.PortLabel\n\n        this._init(clonedData)\n    }\n\n    PortData.prototype = {\n\n        getPorts: function() {\n            return this.ports\n        },\n\n        getGroup: function(name) {\n            return this.groups[name] || {}\n        },\n\n        getPortsByGroup: function(groupName) {\n\n            return this.ports.filter(function(port) {\n                return port.group === groupName\n            })\n        },\n\n        getGroupPortsMetrics: function(groupName, elBBox) {\n\n            const group = this.getGroup(groupName)\n            const ports = this.getPortsByGroup(groupName)\n\n            const groupPosition = group.position || {}\n            let groupPositionName = groupPosition.name\n            const namespace = this.portLayoutNamespace\n            if (!namespace[groupPositionName]) {\n                groupPositionName = 'left'\n            }\n\n            const groupArgs = groupPosition.args || {}\n            const portsArgs = ports.map(function(port) {\n                return port && port.position && port.position.args\n            })\n            const groupPortTransformations = namespace[groupPositionName](portsArgs, elBBox, groupArgs)\n\n            const accumulator = {\n                ports: ports,\n                result: []\n            }\n\n            util.toArray(groupPortTransformations).reduce(function(res, portTransformation, index) {\n                const port = res.ports[index]\n                res.result.push({\n                    portId: port.id,\n                    portTransformation: portTransformation,\n                    labelTransformation: this._getPortLabelLayout(port, g.Point(portTransformation), elBBox),\n                    portAttrs: port.attrs,\n                    portSize: port.size,\n                    labelSize: port.label.size\n                })\n                return res\n            }.bind(this), accumulator)\n\n            return accumulator.result\n        },\n\n        _getPortLabelLayout: function(port, portPosition, elBBox) {\n\n            const namespace = this.portLabelLayoutNamespace\n            const labelPosition = port.label.position.name || 'left'\n\n            if (namespace[labelPosition]) {\n                return namespace[labelPosition](portPosition, elBBox, port.label.position.args)\n            }\n\n            return null\n        },\n\n        _init: function(data) {\n\n            // prepare groups\n            if (util.isObject(data.groups)) {\n                const groups = Object.keys(data.groups)\n                for (let i = 0, n = groups.length; i < n; i++) {\n                    const key = groups[i]\n                    this.groups[key] = this._evaluateGroup(data.groups[key])\n                }\n            }\n\n            // prepare ports\n            const ports = util.toArray(data.items)\n            for (let j = 0, m = ports.length; j < m; j++) {\n                this.ports.push(this._evaluatePort(ports[j]))\n            }\n        },\n\n        _evaluateGroup: function(group) {\n\n            return util.merge(group, {\n                position: this._getPosition(group.position, true),\n                label: this._getLabel(group, true)\n            })\n        },\n\n        _evaluatePort: function(port) {\n\n            const evaluated = util.assign({}, port)\n\n            const group = this.getGroup(port.group)\n\n            evaluated.markup = evaluated.markup || group.markup\n            evaluated.attrs = util.merge({}, group.attrs, evaluated.attrs)\n            evaluated.position = this._createPositionNode(group, evaluated)\n            evaluated.label = util.merge({}, group.label, this._getLabel(evaluated))\n            evaluated.z = this._getZIndex(group, evaluated)\n            evaluated.size = util.assign({}, group.size, evaluated.size)\n\n            return evaluated\n        },\n\n        _getZIndex: function(group, port) {\n\n            if (util.isNumber(port.z)) {\n                return port.z\n            }\n            if (util.isNumber(group.z) || group.z === 'auto') {\n                return group.z\n            }\n            return 'auto'\n        },\n\n        _createPositionNode: function(group, port) {\n\n            return util.merge({\n                name: 'left',\n                args: {}\n            }, group.position, { args: port.args })\n        },\n\n        _getPosition: function(position, setDefault) {\n\n            const args = {}\n            let positionName\n\n            if (util.isFunction(position)) {\n                positionName = 'fn'\n                args.fn = position\n            } else if (util.isString(position)) {\n                positionName = position\n            } else if (position === undefined) {\n                positionName = setDefault ? 'left' : null\n            } else if (Array.isArray(position)) {\n                positionName = 'absolute'\n                args.x = position[0]\n                args.y = position[1]\n            } else if (util.isObject(position)) {\n                positionName = position.name\n                util.assign(args, position.args)\n            }\n\n            const result = { args: args }\n\n            if (positionName) {\n                result.name = positionName\n            }\n            return result\n        },\n\n        _getLabel: function(item, setDefaults) {\n\n            const label = item.label || {}\n\n            const ret = label\n            ret.position = this._getPosition(label.position, setDefaults)\n\n            return ret\n        }\n    }\n\n    util.assign(joint.dia.Element.prototype, {\n\n        _initializePorts: function() {\n\n            this._createPortData()\n            this.on('change:ports', function() {\n\n                this._processRemovedPort()\n                this._createPortData()\n            }, this)\n        },\n\n        /**\n         * remove links tied wiht just removed element\n         * @private\n         */\n        _processRemovedPort: function() {\n\n            const current = this.get('ports') || {}\n            const currentItemsMap = {}\n\n            util.toArray(current.items).forEach(function(item) {\n                currentItemsMap[item.id] = true\n            })\n\n            const previous = this.previous('ports') || {}\n            const removed = {}\n\n            util.toArray(previous.items).forEach(function(item) {\n                if (!currentItemsMap[item.id]) {\n                    removed[item.id] = true\n                }\n            })\n\n            const {graph} = this\n            if (graph && !util.isEmpty(removed)) {\n\n                const inboundLinks = graph.getConnectedLinks(this, { inbound: true })\n                inboundLinks.forEach(function(link) {\n\n                    if (removed[link.get('target').port]) link.remove()\n                })\n\n                const outboundLinks = graph.getConnectedLinks(this, { outbound: true })\n                outboundLinks.forEach(function(link) {\n\n                    if (removed[link.get('source').port]) link.remove()\n                })\n            }\n        },\n\n        /**\n         * @returns {boolean}\n         */\n        hasPorts: function() {\n\n            const ports = this.prop('ports/items')\n            return Array.isArray(ports) && ports.length > 0\n        },\n\n        /**\n         * @param {string} id\n         * @returns {boolean}\n         */\n        hasPort: function(id) {\n\n            return this.getPortIndex(id) !== -1\n        },\n\n        /**\n         * @returns {Array<object>}\n         */\n        getPorts: function() {\n\n            return util.cloneDeep(this.prop('ports/items')) || []\n        },\n\n        /**\n         * @param {string} id\n         * @returns {object}\n         */\n        getPort: function(id) {\n\n            return util.cloneDeep(util.toArray(this.prop('ports/items')).find(function(port) {\n                return port.id && port.id === id\n            }))\n        },\n\n        /**\n         * @param {string} groupName\n         * @returns {Object<portId, {x: number, y: number, angle: number}>}\n         */\n        getPortsPositions: function(groupName) {\n\n            const portsMetrics = this._portSettingsData.getGroupPortsMetrics(groupName, g.Rect(this.size()))\n\n            return portsMetrics.reduce(function(positions, metrics) {\n                const transformation = metrics.portTransformation\n                positions[metrics.portId] = {\n                    x: transformation.x,\n                    y: transformation.y,\n                    angle: transformation.angle\n                }\n                return positions\n            }, {})\n        },\n\n        /**\n         * @param {string|Port} port port id or port\n         * @returns {number} port index\n         */\n        getPortIndex: function(port) {\n\n            const id = util.isObject(port) ? port.id : port\n\n            if (!this._isValidPortId(id)) {\n                return -1\n            }\n\n            return util.toArray(this.prop('ports/items')).findIndex(function(item) {\n                return item.id === id\n            })\n        },\n\n        /**\n         * @param {object} port\n         * @param {object} [opt]\n         * @returns {joint.dia.Element}\n         */\n        addPort: function(port, opt) {\n\n            if (!util.isObject(port) || Array.isArray(port)) {\n                throw new Error('Element: addPort requires an object.')\n            }\n\n            const ports = util.assign([], this.prop('ports/items'))\n            ports.push(port)\n            this.prop('ports/items', ports, opt)\n\n            return this\n        },\n\n        /**\n         * @param {string} portId\n         * @param {string|object=} path\n         * @param {*=} value\n         * @param {object=} opt\n         * @returns {joint.dia.Element}\n         */\n        portProp: function(portId, path, value, opt) {\n\n            const index = this.getPortIndex(portId)\n\n            if (index === -1) {\n                throw new Error(`Element: unable to find port with id ${  portId}`)\n            }\n\n            let args = Array.prototype.slice.call(arguments, 1)\n            if (Array.isArray(path)) {\n                args[0] = ['ports', 'items', index].concat(path)\n            } else if (util.isString(path)) {\n\n                // Get/set an attribute by a special path syntax that delimits\n                // nested objects by the colon character.\n                args[0] = ['ports/items/', index, '/', path].join('')\n\n            } else {\n\n                args = [`ports/items/${  index}`]\n                if (util.isPlainObject(path)) {\n                    args.push(path)\n                    args.push(value)\n                }\n            }\n\n            return this.prop.apply(this, args)\n        },\n\n        _validatePorts: function() {\n\n            let portsAttr = this.get('ports') || {}\n\n            const errorMessages = []\n            portsAttr = portsAttr || {}\n            const ports = util.toArray(portsAttr.items)\n\n            ports.forEach(function(p) {\n\n                if (typeof p !== 'object') {\n                    errorMessages.push('Element: invalid port ', p)\n                }\n\n                if (!this._isValidPortId(p.id)) {\n                    p.id = util.uuid()\n                }\n            }, this)\n\n            if (joint.util.uniq(ports, 'id').length !== ports.length) {\n                errorMessages.push('Element: found id duplicities in ports.')\n            }\n\n            return errorMessages\n        },\n\n        /**\n         * @param {string} id port id\n         * @returns {boolean}\n         * @private\n         */\n        _isValidPortId: function(id) {\n\n            return id !== null && id !== undefined && !util.isObject(id)\n        },\n\n        addPorts: function(ports, opt) {\n\n            if (ports.length) {\n                this.prop('ports/items', util.assign([], this.prop('ports/items')).concat(ports), opt)\n            }\n\n            return this\n        },\n\n        removePort: function(port, opt) {\n\n            const options = opt || {}\n            const ports = util.assign([], this.prop('ports/items'))\n\n            const index = this.getPortIndex(port)\n\n            if (index !== -1) {\n                ports.splice(index, 1)\n                options.rewrite = true\n                this.prop('ports/items', ports, options)\n            }\n\n            return this\n        },\n\n        /**\n         * @private\n         */\n        _createPortData: function() {\n\n            const err = this._validatePorts()\n\n            if (err.length > 0) {\n                this.set('ports', this.previous('ports'))\n                throw new Error(err.join(' '))\n            }\n\n            let prevPortData\n\n            if (this._portSettingsData) {\n\n                prevPortData = this._portSettingsData.getPorts()\n            }\n\n            this._portSettingsData = new PortData(this.get('ports'))\n\n            const curPortData = this._portSettingsData.getPorts()\n\n            if (prevPortData) {\n\n                const added = curPortData.filter(function(item) {\n                    if (!prevPortData.find(function(prevPort) { return prevPort.id === item.id})) {\n                        return item\n                    }\n                })\n\n                const removed = prevPortData.filter(function(item) {\n                    if (!curPortData.find(function(curPort) { return curPort.id === item.id})) {\n                        return item\n                    }\n                })\n\n                if (removed.length > 0) {\n                    this.trigger('ports:remove', this, removed)\n                }\n\n                if (added.length > 0) {\n                    this.trigger('ports:add', this, added)\n                }\n            }\n        }\n    })\n\n    util.assign(joint.dia.ElementView.prototype, {\n\n        portContainerMarkup: 'g',\n        portMarkup: [{\n            tagName: 'circle',\n            selector: 'circle',\n            attributes: {\n                r: 10,\n                fill: '#FFFFFF',\n                stroke: '#000000'\n            }\n        }],\n        portLabelMarkup: [{\n            tagName: 'text',\n            selector: 'text',\n            attributes: {\n                fill: '#000000'\n            }\n        }],\n        /** @type {Object<string, {portElement: Vectorizer, portLabelElement: Vectorizer}>} */\n        _portElementsCache: null,\n\n        /**\n         * @private\n         */\n        _initializePorts: function() {\n\n            this._portElementsCache = {}\n\n            this.listenTo(this.model, 'change:ports', function() {\n\n                this._refreshPorts()\n            })\n        },\n\n        /**\n         * @typedef {Object} Port\n         *\n         * @property {string} id\n         * @property {Object} position\n         * @property {Object} label\n         * @property {Object} attrs\n         * @property {string} markup\n         * @property {string} group\n         */\n\n        /**\n         * @private\n         */\n        _refreshPorts: function() {\n\n            this._removePorts()\n            this._portElementsCache = {}\n\n            this._renderPorts()\n        },\n\n        /**\n         * @private\n         */\n        _renderPorts: function() {\n\n            // references to rendered elements without z-index\n            const elementReferences = []\n            const elem = this._getContainerElement()\n\n            for (let i = 0, count = elem.node.childNodes.length; i < count; i++) {\n                elementReferences.push(elem.node.childNodes[i])\n            }\n\n            const portsGropsByZ = util.groupBy(this.model._portSettingsData.getPorts(), 'z')\n            const withoutZKey = 'auto'\n\n            // render non-z first\n            util.toArray(portsGropsByZ[withoutZKey]).forEach(function(port) {\n                const portElement = this._getPortElement(port)\n                elem.append(portElement)\n                elementReferences.push(portElement)\n            }, this)\n\n            const groupNames = Object.keys(portsGropsByZ)\n            for (let k = 0; k < groupNames.length; k++) {\n                const groupName = groupNames[k]\n                if (groupName !== withoutZKey) {\n                    const z = parseInt(groupName, 10)\n                    this._appendPorts(portsGropsByZ[groupName], z, elementReferences)\n                }\n            }\n\n            this._updatePorts()\n        },\n\n        /**\n         * @returns {V}\n         * @private\n         */\n        _getContainerElement: function() {\n\n            return this.rotatableNode || this.vel\n        },\n\n        /**\n         * @param {Array<Port>}ports\n         * @param {number} z\n         * @param refs\n         * @private\n         */\n        _appendPorts: function(ports, z, refs) {\n\n            const containerElement = this._getContainerElement()\n            const portElements = util.toArray(ports).map(this._getPortElement, this)\n\n            if (refs[z] || z < 0) {\n                V(refs[Math.max(z, 0)]).before(portElements)\n            } else {\n                containerElement.append(portElements)\n            }\n        },\n\n        /**\n         * Try to get element from cache,\n         * @param port\n         * @returns {*}\n         * @private\n         */\n        _getPortElement: function(port) {\n\n            if (this._portElementsCache[port.id]) {\n                return this._portElementsCache[port.id].portElement\n            }\n            return this._createPortElement(port)\n        },\n\n        findPortNode: function(portId, selector) {\n            const portCache = this._portElementsCache[portId]\n            if (!portCache) return null\n            const portRoot = portCache.portContentElement.node\n            const portSelectors = portCache.portContentSelectors\n            return this.findBySelector(selector, portRoot, portSelectors)[0]\n        },\n\n        /**\n         * @private\n         */\n        _updatePorts: function() {\n\n            // layout ports without group\n            this._updatePortGroup(undefined)\n            // layout ports with explicit group\n            const groupsNames = Object.keys(this.model._portSettingsData.groups)\n            groupsNames.forEach(this._updatePortGroup, this)\n        },\n\n        /**\n         * @private\n         */\n        _removePorts: function() {\n            util.invoke(this._portElementsCache, 'portElement.remove')\n        },\n\n        /**\n         * @param {Port} port\n         * @returns {V}\n         * @private\n         */\n        _createPortElement: function(port) {\n\n\n            let portElement\n            let labelElement\n\n            const portMarkup = this._getPortMarkup(port)\n            let portSelectors\n            if (Array.isArray(portMarkup)) {\n                const portDoc = util.parseDOMJSON(portMarkup)\n                const portFragment = portDoc.fragment\n                if (portFragment.childNodes.length > 1) {\n                    portElement = V('g').append(portFragment)\n                } else {\n                    portElement = V(portFragment.firstChild)\n                }\n                portSelectors = portDoc.selectors\n            } else {\n                portElement = V(portMarkup)\n                if (Array.isArray(portElement)) {\n                    portElement = V('g').append(portElement)\n                }\n            }\n\n            if (!portElement) {\n                throw new Error('ElementView: Invalid port markup.')\n            }\n\n            portElement.attr({\n                port: port.id,\n                'port-group': port.group\n            })\n\n            const labelMarkup = this._getPortLabelMarkup(port.label)\n            let labelSelectors\n            if (Array.isArray(labelMarkup)) {\n                const labelDoc = util.parseDOMJSON(labelMarkup)\n                const labelFragment = labelDoc.fragment\n                if (labelFragment.childNodes.length > 1) {\n                    labelElement = V('g').append(labelFragment)\n                } else {\n                    labelElement = V(labelFragment.firstChild)\n                }\n                labelSelectors = labelDoc.selectors\n            } else {\n                labelElement = V(labelMarkup)\n                if (Array.isArray(labelElement)) {\n                    labelElement = V('g').append(labelElement)\n                }\n            }\n\n            if (!labelElement) {\n                throw new Error('ElementView: Invalid port label markup.')\n            }\n\n            let portContainerSelectors\n            if (portSelectors && labelSelectors) {\n                for (const key in labelSelectors) {\n                    if (portSelectors[key]) throw new Error('ElementView: selectors within port must be unique.')\n                }\n                portContainerSelectors = util.assign({}, portSelectors, labelSelectors)\n            } else {\n                portContainerSelectors = portSelectors || labelSelectors\n            }\n\n            const portContainerElement = V(this.portContainerMarkup)\n                .addClass('joint-port')\n                .append([\n                    portElement.addClass('joint-port-body'),\n                    labelElement.addClass('joint-port-label')\n                ])\n\n            this._portElementsCache[port.id] = {\n                portElement: portContainerElement,\n                portLabelElement: labelElement,\n                portSelectors: portContainerSelectors,\n                portLabelSelectors: labelSelectors,\n                portContentElement: portElement,\n                portContentSelectors: portSelectors\n            }\n\n            return portContainerElement\n        },\n\n        /**\n         * @param {string=} groupName\n         * @private\n         */\n        _updatePortGroup: function(groupName) {\n\n            const elementBBox = g.Rect(this.model.size())\n            const portsMetrics = this.model._portSettingsData.getGroupPortsMetrics(groupName, elementBBox)\n\n            for (let i = 0, n = portsMetrics.length; i < n; i++) {\n                const metrics = portsMetrics[i]\n                const {portId} = metrics\n                const cached = this._portElementsCache[portId] || {}\n                const {portTransformation} = metrics\n                this.applyPortTransform(cached.portElement, portTransformation)\n                this.updateDOMSubtreeAttributes(cached.portElement.node, metrics.portAttrs, {\n                    rootBBox: new g.Rect(metrics.portSize),\n                    selectors: cached.portSelectors\n                })\n\n                const {labelTransformation} = metrics\n                if (labelTransformation) {\n                    this.applyPortTransform(cached.portLabelElement, labelTransformation, (-portTransformation.angle || 0))\n                    this.updateDOMSubtreeAttributes(cached.portLabelElement.node, labelTransformation.attrs, {\n                        rootBBox: new g.Rect(metrics.labelSize),\n                        selectors: cached.portLabelSelectors\n                    })\n                }\n            }\n        },\n\n        /**\n         * @param {Vectorizer} element\n         * @param {{dx:number, dy:number, angle: number, attrs: Object, x:number: y:number}} transformData\n         * @param {number=} initialAngle\n         * @constructor\n         */\n        applyPortTransform: function(element, transformData, initialAngle) {\n\n            const matrix = V.createSVGMatrix()\n                .rotate(initialAngle || 0)\n                .translate(transformData.x || 0, transformData.y || 0)\n                .rotate(transformData.angle || 0)\n\n            element.transform(matrix, { absolute: true })\n        },\n\n        /**\n         * @param {Port} port\n         * @returns {string}\n         * @private\n         */\n        _getPortMarkup: function(port) {\n\n            return port.markup || this.model.get('portMarkup') || this.model.portMarkup || this.portMarkup\n        },\n\n        /**\n         * @param {Object} label\n         * @returns {string}\n         * @private\n         */\n        _getPortLabelMarkup: function(label) {\n\n            return label.markup || this.model.get('portLabelMarkup') || this.model.portLabelMarkup || this.portLabelMarkup\n        }\n\n    })\n}(joint, joint.util))\n\njoint.dia.Element.define('basic.Generic', {\n    attrs: {\n        '.': { fill: '#ffffff', stroke: 'none' }\n    }\n})\n\njoint.shapes.basic.Generic.define('basic.Rect', {\n    attrs: {\n        rect: {\n            fill: '#ffffff',\n            stroke: '#000000',\n            width: 100,\n            height: 60\n        },\n        text: {\n            fill: '#000000',\n            text: '',\n            'font-size': 14,\n            'ref-x': .5,\n            'ref-y': .5,\n            'text-anchor': 'middle',\n            'y-alignment': 'middle',\n            'font-family': 'Arial, helvetica, sans-serif'\n        }\n    }\n}, {\n    markup: '<g class=\"rotatable\"><g class=\"scalable\"><rect/></g><text/></g>'\n})\n\njoint.shapes.basic.TextView = joint.dia.ElementView.extend({\n\n    initialize: function() {\n        joint.dia.ElementView.prototype.initialize.apply(this, arguments)\n        // The element view is not automatically rescaled to fit the model size\n        // when the attribute 'attrs' is changed.\n        this.listenTo(this.model, 'change:attrs', this.resize)\n    }\n})\n\njoint.shapes.basic.Generic.define('basic.Text', {\n    attrs: {\n        text: {\n            'font-size': 18,\n            fill: '#000000'\n        }\n    }\n}, {\n    markup: '<g class=\"rotatable\"><g class=\"scalable\"><text/></g></g>',\n})\n\njoint.shapes.basic.Generic.define('basic.Circle', {\n    size: { width: 60, height: 60 },\n    attrs: {\n        circle: {\n            fill: '#ffffff',\n            stroke: '#000000',\n            r: 30,\n            cx: 30,\n            cy: 30\n        },\n        text: {\n            'font-size': 14,\n            text: '',\n            'text-anchor': 'middle',\n            'ref-x': .5,\n            'ref-y': .5,\n            'y-alignment': 'middle',\n            fill: '#000000',\n            'font-family': 'Arial, helvetica, sans-serif'\n        }\n    }\n}, {\n    markup: '<g class=\"rotatable\"><g class=\"scalable\"><circle/></g><text/></g>',\n})\n\njoint.shapes.basic.Generic.define('basic.Ellipse', {\n    size: { width: 60, height: 40 },\n    attrs: {\n        ellipse: {\n            fill: '#ffffff',\n            stroke: '#000000',\n            rx: 30,\n            ry: 20,\n            cx: 30,\n            cy: 20\n        },\n        text: {\n            'font-size': 14,\n            text: '',\n            'text-anchor': 'middle',\n            'ref-x': .5,\n            'ref-y': .5,\n            'y-alignment': 'middle',\n            fill: '#000000',\n            'font-family': 'Arial, helvetica, sans-serif'\n        }\n    }\n}, {\n    markup: '<g class=\"rotatable\"><g class=\"scalable\"><ellipse/></g><text/></g>',\n})\n\njoint.shapes.basic.Generic.define('basic.Polygon', {\n    size: { width: 60, height: 40 },\n    attrs: {\n        polygon: {\n            fill: '#ffffff',\n            stroke: '#000000'\n        },\n        text: {\n            'font-size': 14,\n            text: '',\n            'text-anchor': 'middle',\n            'ref-x': .5,\n            'ref-dy': 20,\n            'y-alignment': 'middle',\n            fill: '#000000',\n            'font-family': 'Arial, helvetica, sans-serif'\n        }\n    }\n}, {\n    markup: '<g class=\"rotatable\"><g class=\"scalable\"><polygon/></g><text/></g>',\n})\n\njoint.shapes.basic.Generic.define('basic.Polyline', {\n    size: { width: 60, height: 40 },\n    attrs: {\n        polyline: {\n            fill: '#ffffff',\n            stroke: '#000000'\n        },\n        text: {\n            'font-size': 14,\n            text: '',\n            'text-anchor': 'middle',\n            'ref-x': .5,\n            'ref-dy': 20,\n            'y-alignment': 'middle',\n            fill: '#000000',\n            'font-family': 'Arial, helvetica, sans-serif'\n        }\n    }\n}, {\n    markup: '<g class=\"rotatable\"><g class=\"scalable\"><polyline/></g><text/></g>',\n})\n\njoint.shapes.basic.Generic.define('basic.Image', {\n    attrs: {\n        text: {\n            'font-size': 14,\n            text: '',\n            'text-anchor': 'middle',\n            'ref-x': .5,\n            'ref-dy': 20,\n            'y-alignment': 'middle',\n            fill: '#000000',\n            'font-family': 'Arial, helvetica, sans-serif'\n        }\n    }\n}, {\n    markup: '<g class=\"rotatable\"><g class=\"scalable\"><image/></g><text/></g>',\n})\n\njoint.shapes.basic.Generic.define('basic.Path', {\n    size: { width: 60, height: 60 },\n    attrs: {\n        path: {\n            fill: '#ffffff',\n            stroke: '#000000'\n        },\n        text: {\n            'font-size': 14,\n            text: '',\n            'text-anchor': 'middle',\n            ref: 'path',\n            'ref-x': .5,\n            'ref-dy': 10,\n            fill: '#000000',\n            'font-family': 'Arial, helvetica, sans-serif'\n        }\n    }\n\n}, {\n    markup: '<g class=\"rotatable\"><g class=\"scalable\"><path/></g><text/></g>',\n})\n\njoint.shapes.basic.Path.define('basic.Rhombus', {\n    attrs: {\n        path: {\n            d: 'M 30 0 L 60 30 30 60 0 30 z'\n        },\n        text: {\n            'ref-y': .5,\n            'ref-dy': null,\n            'y-alignment': 'middle'\n        }\n    }\n})\n\n\n/**\n * @deprecated use the port api instead\n */\n// PortsModelInterface is a common interface for shapes that have ports. This interface makes it easy\n// to create new shapes with ports functionality. It is assumed that the new shapes have\n// `inPorts` and `outPorts` array properties. Only these properties should be used to set ports.\n// In other words, using this interface, it is no longer recommended to set ports directly through the\n// `attrs` object.\n\n// Usage:\n// joint.shapes.custom.MyElementWithPorts = joint.shapes.basic.Path.extend(_.extend({}, joint.shapes.basic.PortsModelInterface, {\n//     getPortAttrs: function(portName, index, total, selector, type) {\n//         var attrs = {};\n//         var portClass = 'port' + index;\n//         var portSelector = selector + '>.' + portClass;\n//         var portTextSelector = portSelector + '>text';\n//         var portBodySelector = portSelector + '>.port-body';\n//\n//         attrs[portTextSelector] = { text: portName };\n//         attrs[portBodySelector] = { port: { id: portName || _.uniqueId(type) , type: type } };\n//         attrs[portSelector] = { ref: 'rect', 'ref-y': (index + 0.5) * (1 / total) };\n//\n//         if (selector === '.outPorts') { attrs[portSelector]['ref-dx'] = 0; }\n//\n//         return attrs;\n//     }\n//}));\njoint.shapes.basic.PortsModelInterface = {\n\n    initialize: function() {\n\n        this.updatePortsAttrs()\n        this.on('change:inPorts change:outPorts', this.updatePortsAttrs, this)\n\n        // Call the `initialize()` of the parent.\n        this.constructor.__super__.constructor.__super__.initialize.apply(this, arguments)\n    },\n\n    updatePortsAttrs: function(eventName) {\n\n        if (this._portSelectors) {\n\n            const newAttrs = joint.util.omit(this.get('attrs'), this._portSelectors)\n            this.set('attrs', newAttrs, { silent: true })\n        }\n\n        // This holds keys to the `attrs` object for all the port specific attribute that\n        // we set in this method. This is necessary in order to remove previously set\n        // attributes for previous ports.\n        this._portSelectors = []\n\n        const attrs = {}\n\n        joint.util.toArray(this.get('inPorts')).forEach(function(portName, index, ports) {\n            const portAttributes = this.getPortAttrs(portName, index, ports.length, '.inPorts', 'in')\n            this._portSelectors = this._portSelectors.concat(Object.keys(portAttributes))\n            joint.util.assign(attrs, portAttributes)\n        }, this)\n\n        joint.util.toArray(this.get('outPorts')).forEach(function(portName, index, ports) {\n            const portAttributes = this.getPortAttrs(portName, index, ports.length, '.outPorts', 'out')\n            this._portSelectors = this._portSelectors.concat(Object.keys(portAttributes))\n            joint.util.assign(attrs, portAttributes)\n        }, this)\n\n        // Silently set `attrs` on the cell so that noone knows the attrs have changed. This makes sure\n        // that, for example, command manager does not register `change:attrs` command but only\n        // the important `change:inPorts`/`change:outPorts` command.\n        this.attr(attrs, { silent: true })\n        // Manually call the `processPorts()` method that is normally called on `change:attrs` (that we just made silent).\n        this.processPorts()\n        // Let the outside world (mainly the `ModelView`) know that we're done configuring the `attrs` object.\n        this.trigger('process:ports')\n    },\n\n    getPortSelector: function(name) {\n\n        let selector = '.inPorts'\n        let index = this.get('inPorts').indexOf(name)\n\n        if (index < 0) {\n            selector = '.outPorts'\n            index = this.get('outPorts').indexOf(name)\n\n            if (index < 0) throw new Error('getPortSelector(): Port doesn\\'t exist.')\n        }\n\n        return `${selector  }>g:nth-child(${  index + 1  })>.port-body`\n    }\n}\n\njoint.shapes.basic.PortsViewInterface = {\n\n    initialize: function() {\n\n        // `Model` emits the `process:ports` whenever it's done configuring the `attrs` object for ports.\n        this.listenTo(this.model, 'process:ports', this.update)\n\n        joint.dia.ElementView.prototype.initialize.apply(this, arguments)\n    },\n\n    update: function() {\n\n        // First render ports so that `attrs` can be applied to those newly created DOM elements\n        // in `ElementView.prototype.update()`.\n        this.renderPorts()\n        joint.dia.ElementView.prototype.update.apply(this, arguments)\n    },\n\n    renderPorts: function() {\n\n        const $inPorts = this.$('.inPorts').empty()\n        const $outPorts = this.$('.outPorts').empty()\n\n        const portTemplate = joint.util.template(this.model.portMarkup)\n\n        const ports = this.model.ports || []\n        ports.filter(function(p) {\n            return p.type === 'in'\n        }).forEach(function(port, index) {\n\n            $inPorts.append(V(portTemplate({ id: index, port: port })).node)\n        })\n\n        ports.filter(function(p) {\n            return p.type === 'out'\n        }).forEach(function(port, index) {\n\n            $outPorts.append(V(portTemplate({ id: index, port: port })).node)\n        })\n    }\n}\n\njoint.shapes.basic.Generic.define('basic.TextBlock', {\n    // see joint.css for more element styles\n    attrs: {\n        rect: {\n            fill: '#ffffff',\n            stroke: '#000000',\n            width: 80,\n            height: 100\n        },\n        text: {\n            fill: '#000000',\n            'font-size': 14,\n            'font-family': 'Arial, helvetica, sans-serif'\n        },\n        '.content': {\n            text: '',\n            'ref-x': .5,\n            'ref-y': .5,\n            'y-alignment': 'middle',\n            'x-alignment': 'middle'\n        }\n    },\n\n    content: ''\n}, {\n    markup: [\n        '<g class=\"rotatable\">',\n        '<g class=\"scalable\"><rect/></g>',\n        joint.env.test('svgforeignobject') ? '<foreignObject class=\"fobj\"><body xmlns=\"http://www.w3.org/1999/xhtml\"><div class=\"content\"/></body></foreignObject>' : '<text class=\"content\"/>',\n        '</g>'\n    ].join(''),\n\n    initialize: function() {\n\n        this.listenTo(this, 'change:size', this.updateSize)\n        this.listenTo(this, 'change:content', this.updateContent)\n        this.updateSize(this, this.get('size'))\n        this.updateContent(this, this.get('content'))\n        joint.shapes.basic.Generic.prototype.initialize.apply(this, arguments)\n    },\n\n    updateSize: function(cell, size) {\n\n        // Selector `foreignObject' doesn't work across all browsers, we're using class selector instead.\n        // We have to clone size as we don't want attributes.div.style to be same object as attributes.size.\n        this.attr({\n            '.fobj': joint.util.assign({}, size),\n            div: {\n                style: joint.util.assign({}, size)\n            }\n        })\n    },\n\n    updateContent: function(cell, content) {\n\n        if (joint.env.test('svgforeignobject')) {\n\n            // Content element is a <div> element.\n            this.attr({\n                '.content': {\n                    html: joint.util.sanitizeHTML(content)\n                }\n            })\n\n        } else {\n\n            // Content element is a <text> element.\n            // SVG elements don't have innerHTML attribute.\n            this.attr({\n                '.content': {\n                    text: content\n                }\n            })\n        }\n    },\n\n    // Here for backwards compatibility:\n    setForeignObjectSize: function() {\n\n        this.updateSize.apply(this, arguments)\n    },\n\n    // Here for backwards compatibility:\n    setDivContent: function() {\n\n        this.updateContent.apply(this, arguments)\n    }\n})\n\n// TextBlockView implements the fallback for IE when no foreignObject exists and\n// the text needs to be manually broken.\njoint.shapes.basic.TextBlockView = joint.dia.ElementView.extend({\n\n    initialize: function() {\n\n        joint.dia.ElementView.prototype.initialize.apply(this, arguments)\n\n        // Keep this for backwards compatibility:\n        this.noSVGForeignObjectElement = !joint.env.test('svgforeignobject')\n\n        if (!joint.env.test('svgforeignobject')) {\n\n            this.listenTo(this.model, 'change:content change:size', function(cell) {\n                // avoiding pass of extra paramters\n                this.updateContent(cell)\n            })\n        }\n    },\n\n    update: function(cell, renderingOnlyAttrs) {\n\n        const {model} = this\n\n        if (!joint.env.test('svgforeignobject')) {\n\n            // Update everything but the content first.\n            const noTextAttrs = joint.util.omit(renderingOnlyAttrs || model.get('attrs'), '.content')\n            joint.dia.ElementView.prototype.update.call(this, model, noTextAttrs)\n\n            if (!renderingOnlyAttrs || joint.util.has(renderingOnlyAttrs, '.content')) {\n                // Update the content itself.\n                this.updateContent(model, renderingOnlyAttrs)\n            }\n\n        } else {\n\n            joint.dia.ElementView.prototype.update.call(this, model, renderingOnlyAttrs)\n        }\n    },\n\n    updateContent: function(cell, renderingOnlyAttrs) {\n\n        // Create copy of the text attributes\n        let textAttrs = joint.util.merge({}, (renderingOnlyAttrs || cell.get('attrs'))['.content'])\n\n        textAttrs = joint.util.omit(textAttrs, 'text')\n\n        // Break the content to fit the element size taking into account the attributes\n        // set on the model.\n        const text = joint.util.breakText(cell.get('content'), cell.get('size'), textAttrs, {\n            // measuring sandbox svg document\n            svgDocument: this.paper.svg\n        })\n\n        // Create a new attrs with same structure as the model attrs { text: { *textAttributes* }}\n        const attrs = joint.util.setByPath({}, '.content', textAttrs, '/')\n\n        // Replace text attribute with the one we just processed.\n        attrs['.content'].text = text\n\n        // Update the view using renderingOnlyAttributes parameter.\n        joint.dia.ElementView.prototype.update.call(this, cell, attrs)\n    }\n});\n\n(function(dia, util, env, V) {\n\n    \n\n    // ELEMENTS\n\n    const {Element} = dia\n\n    Element.define('standard.Rectangle', {\n        attrs: {\n            body: {\n                refWidth: '100%',\n                refHeight: '100%',\n                strokeWidth: 2,\n                stroke: '#000000',\n                fill: '#FFFFFF'\n            },\n            label: {\n                textVerticalAnchor: 'middle',\n                textAnchor: 'middle',\n                refX: '50%',\n                refY: '50%',\n                fontSize: 14,\n                fill: '#333333'\n            }\n        }\n    }, {\n        markup: [{\n            tagName: 'rect',\n            selector: 'body',\n        }, {\n            tagName: 'text',\n            selector: 'label'\n        }]\n    })\n\n    Element.define('standard.Circle', {\n        attrs: {\n            body: {\n                refCx: '50%',\n                refCy: '50%',\n                refR: '50%',\n                strokeWidth: 2,\n                stroke: '#333333',\n                fill: '#FFFFFF'\n            },\n            label: {\n                textVerticalAnchor: 'middle',\n                textAnchor: 'middle',\n                refX: '50%',\n                refY: '50%',\n                fontSize: 14,\n                fill: '#333333'\n            }\n        }\n    }, {\n        markup: [{\n            tagName: 'circle',\n            selector: 'body'\n        }, {\n            tagName: 'text',\n            selector: 'label'\n        }]\n    })\n\n    Element.define('standard.Ellipse', {\n        attrs: {\n            body: {\n                refCx: '50%',\n                refCy: '50%',\n                refRx: '50%',\n                refRy: '50%',\n                strokeWidth: 2,\n                stroke: '#333333',\n                fill: '#FFFFFF'\n            },\n            label: {\n                textVerticalAnchor: 'middle',\n                textAnchor: 'middle',\n                refX: '50%',\n                refY: '50%',\n                fontSize: 14,\n                fill: '#333333'\n            }\n        }\n    }, {\n        markup: [{\n            tagName: 'ellipse',\n            selector: 'body'\n        }, {\n            tagName: 'text',\n            selector: 'label'\n        }]\n    })\n\n    Element.define('standard.Path', {\n        attrs: {\n            body: {\n                refD: 'M 0 0 L 10 0 10 10 0 10 Z',\n                strokeWidth: 2,\n                stroke: '#333333',\n                fill: '#FFFFFF'\n            },\n            label: {\n                textVerticalAnchor: 'middle',\n                textAnchor: 'middle',\n                refX: '50%',\n                refY: '50%',\n                fontSize: 14,\n                fill: '#333333'\n            }\n        }\n    }, {\n        markup: [{\n            tagName: 'path',\n            selector: 'body'\n        }, {\n            tagName: 'text',\n            selector: 'label'\n        }]\n    })\n\n    Element.define('standard.Polygon', {\n        attrs: {\n            body: {\n                refPoints: '0 0 10 0 10 10 0 10',\n                strokeWidth: 2,\n                stroke: '#333333',\n                fill: '#FFFFFF'\n            },\n            label: {\n                textVerticalAnchor: 'middle',\n                textAnchor: 'middle',\n                refX: '50%',\n                refY: '50%',\n                fontSize: 14,\n                fill: '#333333'\n            }\n        }\n    }, {\n        markup: [{\n            tagName: 'polygon',\n            selector: 'body'\n        }, {\n            tagName: 'text',\n            selector: 'label'\n        }]\n    })\n\n    Element.define('standard.Polyline', {\n        attrs: {\n            body: {\n                refPoints: '0 0 10 0 10 10 0 10 0 0',\n                strokeWidth: 2,\n                stroke: '#333333',\n                fill: '#FFFFFF'\n            },\n            label: {\n                textVerticalAnchor: 'middle',\n                textAnchor: 'middle',\n                refX: '50%',\n                refY: '50%',\n                fontSize: 14,\n                fill: '#333333'\n            }\n        }\n    }, {\n        markup: [{\n            tagName: 'polyline',\n            selector: 'body'\n        }, {\n            tagName: 'text',\n            selector: 'label'\n        }]\n    })\n\n    Element.define('standard.Image', {\n        attrs: {\n            image: {\n                refWidth: '100%',\n                refHeight: '100%',\n                // xlinkHref: '[URL]'\n            },\n            label: {\n                textVerticalAnchor: 'top',\n                textAnchor: 'middle',\n                refX: '50%',\n                refY: '100%',\n                refY2: 10,\n                fontSize: 14,\n                fill: '#333333'\n            }\n        }\n    }, {\n        markup: [{\n            tagName: 'image',\n            selector: 'image'\n        }, {\n            tagName: 'text',\n            selector: 'label'\n        }]\n    })\n\n    Element.define('standard.BorderedImage', {\n        attrs: {\n            border: {\n                refWidth: '100%',\n                refHeight: '100%',\n                stroke: '#333333',\n                strokeWidth: 2\n            },\n            image: {\n                // xlinkHref: '[URL]'\n                refWidth: -1,\n                refHeight: -1,\n                x: 0.5,\n                y: 0.5\n            },\n            label: {\n                textVerticalAnchor: 'top',\n                textAnchor: 'middle',\n                refX: '50%',\n                refY: '100%',\n                refY2: 10,\n                fontSize: 14,\n                fill: '#333333'\n            }\n        }\n    }, {\n        markup: [{\n            tagName: 'image',\n            selector: 'image'\n        }, {\n            tagName: 'rect',\n            selector: 'border',\n            attributes: {\n                fill: 'none'\n            }\n        }, {\n            tagName: 'text',\n            selector: 'label'\n        }]\n    })\n\n    Element.define('standard.EmbeddedImage', {\n        attrs: {\n            body: {\n                refWidth: '100%',\n                refHeight: '100%',\n                stroke: '#333333',\n                fill: '#FFFFFF',\n                strokeWidth: 2\n            },\n            image: {\n                // xlinkHref: '[URL]'\n                refWidth: '30%',\n                refHeight: -20,\n                x: 10,\n                y: 10,\n                preserveAspectRatio: 'xMidYMin'\n            },\n            label: {\n                textVerticalAnchor: 'top',\n                textAnchor: 'left',\n                refX: '30%',\n                refX2: 20, // 10 + 10\n                refY: 10,\n                fontSize: 14,\n                fill: '#333333'\n            }\n        }\n    }, {\n        markup: [{\n            tagName: 'rect',\n            selector: 'body'\n        }, {\n            tagName: 'image',\n            selector: 'image'\n        }, {\n            tagName: 'text',\n            selector: 'label'\n        }]\n    })\n\n    Element.define('standard.HeaderedRectangle', {\n        attrs: {\n            body: {\n                refWidth: '100%',\n                refHeight: '100%',\n                strokeWidth: 2,\n                stroke: '#000000',\n                fill: '#FFFFFF'\n            },\n            header: {\n                refWidth: '100%',\n                height: 30,\n                strokeWidth: 2,\n                stroke: '#000000',\n                fill: '#FFFFFF'\n            },\n            headerText: {\n                textVerticalAnchor: 'middle',\n                textAnchor: 'middle',\n                refX: '50%',\n                refY: 15,\n                fontSize: 16,\n                fill: '#333333'\n            },\n            bodyText: {\n                textVerticalAnchor: 'middle',\n                textAnchor: 'middle',\n                refX: '50%',\n                refY: '50%',\n                refY2: 15,\n                fontSize: 14,\n                fill: '#333333'\n            }\n        }\n    }, {\n        markup: [{\n            tagName: 'rect',\n            selector: 'body'\n        }, {\n            tagName: 'rect',\n            selector: 'header'\n        }, {\n            tagName: 'text',\n            selector: 'headerText'\n        }, {\n            tagName: 'text',\n            selector: 'bodyText'\n        }]\n    })\n\n    const CYLINDER_TILT = 10\n\n    joint.dia.Element.define('standard.Cylinder', {\n        attrs: {\n            body: {\n                lateralArea: CYLINDER_TILT,\n                fill: '#FFFFFF',\n                stroke: '#333333',\n                strokeWidth: 2\n            },\n            top: {\n                refCx: '50%',\n                cy: CYLINDER_TILT,\n                refRx: '50%',\n                ry: CYLINDER_TILT,\n                fill: '#FFFFFF',\n                stroke: '#333333',\n                strokeWidth: 2\n            },\n            label: {\n                textVerticalAnchor: 'middle',\n                textAnchor: 'middle',\n                refX: '50%',\n                refY: '100%',\n                refY2: 15,\n                fontSize: 14,\n                fill: '#333333'\n            }\n        }\n    }, {\n        markup: [{\n            tagName: 'path',\n            selector: 'body'\n        }, {\n            tagName: 'ellipse',\n            selector: 'top'\n        }, {\n            tagName: 'text',\n            selector: 'label'\n        }],\n\n        topRy: function(t, opt) {\n            // getter\n            if (t === undefined) return this.attr('body/lateralArea')\n\n            // setter\n            const isPercentage = util.isPercentage(t)\n\n            const bodyAttrs = { lateralArea: t }\n            const topAttrs = isPercentage\n                ? { refCy: t, refRy: t, cy: null, ry: null }\n                : { refCy: null, refRy: null, cy: t, ry: t }\n\n            return this.attr({ body: bodyAttrs, top: topAttrs }, opt)\n        }\n\n    }, {\n        attributes: {\n            lateralArea: {\n                set: function(t, refBBox) {\n                    const isPercentage = util.isPercentage(t)\n                    if (isPercentage) t = parseFloat(t) / 100\n\n                    const {x} = refBBox\n                    const {y} = refBBox\n                    const w = refBBox.width\n                    const h = refBBox.height\n\n                    // curve control point variables\n                    const rx = w / 2\n                    const ry = isPercentage ? (h * t) : t\n\n                    const kappa = V.KAPPA\n                    const cx = kappa * rx\n                    const cy = kappa * (isPercentage ? (h * t) : t)\n\n                    // shape variables\n                    const xLeft = x\n                    const xCenter = x + (w / 2)\n                    const xRight = x + w\n\n                    const ySideTop = y + ry\n                    const yCurveTop = ySideTop - ry\n                    const ySideBottom = y + h - ry\n                    const yCurveBottom = y + h\n\n                    // return calculated shape\n                    const data = [\n                        'M', xLeft, ySideTop,\n                        'L', xLeft, ySideBottom,\n                        'C', x, (ySideBottom + cy), (xCenter - cx), yCurveBottom, xCenter, yCurveBottom,\n                        'C', (xCenter + cx), yCurveBottom, xRight, (ySideBottom + cy), xRight, ySideBottom,\n                        'L', xRight, ySideTop,\n                        'C', xRight, (ySideTop - cy), (xCenter + cx), yCurveTop, xCenter, yCurveTop,\n                        'C', (xCenter - cx), yCurveTop, xLeft, (ySideTop - cy), xLeft, ySideTop,\n                        'Z'\n                    ]\n                    return { d: data.join(' ') }\n                }\n            }\n        }\n    })\n\n    const foLabelMarkup = {\n        tagName: 'foreignObject',\n        selector: 'foreignObject',\n        attributes: {\n            overflow: 'hidden'\n        },\n        children: [{\n            tagName: 'div',\n            namespaceURI: 'http://www.w3.org/1999/xhtml',\n            selector: 'label',\n            style: {\n                width: '100%',\n                height: '100%',\n                position: 'static',\n                backgroundColor: 'transparent',\n                textAlign: 'center',\n                margin: 0,\n                padding: '0px 5px',\n                boxSizing: 'border-box',\n                display: 'flex',\n                alignItems: 'center',\n                justifyContent: 'center'\n            }\n        }]\n    }\n\n    const svgLabelMarkup = {\n        tagName: 'text',\n        selector: 'label',\n        attributes: {\n            'text-anchor': 'middle'\n        }\n    }\n\n    const labelMarkup = (env.test('svgforeignobject')) ? foLabelMarkup : svgLabelMarkup\n\n    Element.define('standard.TextBlock', {\n        attrs: {\n            body: {\n                refWidth: '100%',\n                refHeight: '100%',\n                stroke: '#333333',\n                fill: '#ffffff',\n                strokeWidth: 2\n            },\n            foreignObject: {\n                refWidth: '100%',\n                refHeight: '100%'\n            },\n            label: {\n                style: {\n                    fontSize: 14\n                }\n            }\n        }\n    }, {\n        markup: [{\n            tagName: 'rect',\n            selector: 'body'\n        }, labelMarkup]\n    }, {\n        attributes: {\n            text: {\n                set: function(text, refBBox, node, attrs) {\n                    if (node instanceof HTMLElement) {\n                        node.textContent = text\n                    } else {\n                        // No foreign object\n                        const style = attrs.style || {}\n                        const wrapValue = { text: text, width: -5, height: '100%' }\n                        const wrapAttrs = util.assign({ textVerticalAnchor: 'middle' }, style)\n                        dia.attributes.textWrap.set.call(this, wrapValue, refBBox, node, wrapAttrs)\n                        return { fill: style.color || null }\n                    }\n                },\n                position: function(text, refBBox, node) {\n                    // No foreign object\n                    if (node instanceof SVGElement) return refBBox.center()\n                }\n            }\n        }\n    })\n\n    // LINKS\n\n    const {Link} = dia\n\n    Link.define('standard.Link', {\n        attrs: {\n            line: {\n                connection: true,\n                stroke: '#333333',\n                strokeWidth: 2,\n                strokeLinejoin: 'round',\n                targetMarker: {\n                    type: 'path',\n                    d: 'M 10 -5 0 0 10 5 z'\n                }\n            },\n            wrapper: {\n                connection: true,\n                strokeWidth: 10,\n                strokeLinejoin: 'round'\n            }\n        }\n    }, {\n        markup: [{\n            tagName: 'path',\n            selector: 'wrapper',\n            attributes: {\n                fill: 'none',\n                cursor: 'pointer',\n                stroke: 'transparent'\n            }\n        }, {\n            tagName: 'path',\n            selector: 'line',\n            attributes: {\n                fill: 'none',\n                'pointer-events': 'none'\n            }\n        }]\n    })\n\n    Link.define('standard.DoubleLink', {\n        attrs: {\n            line: {\n                connection: true,\n                stroke: '#DDDDDD',\n                strokeWidth: 4,\n                strokeLinejoin: 'round',\n                targetMarker: {\n                    type: 'path',\n                    stroke: '#000000',\n                    d: 'M 10 -3 10 -10 -2 0 10 10 10 3'\n                }\n            },\n            outline: {\n                connection: true,\n                stroke: '#000000',\n                strokeWidth: 6,\n                strokeLinejoin: 'round'\n            }\n        }\n    }, {\n        markup: [{\n            tagName: 'path',\n            selector: 'outline',\n            attributes: {\n                fill: 'none'\n            }\n        }, {\n            tagName: 'path',\n            selector: 'line',\n            attributes: {\n                fill: 'none'\n            }\n        }]\n    })\n\n    Link.define('standard.ShadowLink', {\n        attrs: {\n            line: {\n                connection: true,\n                stroke: '#FF0000',\n                strokeWidth: 20,\n                strokeLinejoin: 'round',\n                targetMarker: {\n                    type: 'path',\n                    stroke: 'none',\n                    d: 'M 0 -10 -10 0 0 10 z'\n                },\n                sourceMarker: {\n                    type: 'path',\n                    stroke: 'none',\n                    d: 'M -10 -10 0 0 -10 10 0 10 0 -10 z'\n                }\n            },\n            shadow: {\n                connection: true,\n                refX: 3,\n                refY: 6,\n                stroke: '#000000',\n                strokeOpacity: 0.2,\n                strokeWidth: 20,\n                strokeLinejoin: 'round',\n                targetMarker: {\n                    type: 'path',\n                    d: 'M 0 -10 -10 0 0 10 z',\n                    stroke: 'none'\n                },\n                sourceMarker: {\n                    type: 'path',\n                    stroke: 'none',\n                    d: 'M -10 -10 0 0 -10 10 0 10 0 -10 z'\n                }\n            }\n        }\n    }, {\n        markup: [{\n            tagName: 'path',\n            selector: 'shadow',\n            attributes: {\n                fill: 'none'\n            }\n        }, {\n            tagName: 'path',\n            selector: 'line',\n            attributes: {\n                fill: 'none'\n            }\n        }]\n    })\n\n\n})(joint.dia, joint.util, joint.env, V)\n\njoint.routers.manhattan = (function(g, joint, util) {\n\n    \n\n    var config = {\n\n        // size of the step to find a route (the grid of the manhattan pathfinder)\n        step: 10,\n\n        // the number of route finding loops that cause the router to abort\n        // returns fallback route instead\n        maximumLoops: 2000,\n\n        // the number of decimal places to round floating point coordinates\n        precision: 10,\n\n        // maximum change of direction\n        maxAllowedDirectionChange: 90,\n\n        // should the router use perpendicular linkView option?\n        // does not connect anchor of element but rather a point close-by that is orthogonal\n        // this looks much better\n        perpendicular: true,\n\n        // should the source and/or target not be considered as obstacles?\n        excludeEnds: [], // 'source', 'target'\n\n        // should certain types of elements not be considered as obstacles?\n        excludeTypes: ['basic.Text'],\n\n        // possible starting directions from an element\n        startDirections: ['top', 'right', 'bottom', 'left'],\n\n        // possible ending directions to an element\n        endDirections: ['top', 'right', 'bottom', 'left'],\n\n        // specify the directions used above and what they mean\n        directionMap: {\n            top: { x: 0, y: -1 },\n            right: { x: 1, y: 0 },\n            bottom: { x: 0, y: 1 },\n            left: { x: -1, y: 0 }\n        },\n\n        // cost of an orthogonal step\n        cost: function() {\n\n            return this.step\n        },\n\n        // an array of directions to find next points on the route\n        // different from start/end directions\n        directions: function() {\n\n            const {step} = this\n            const cost = this.cost()\n\n            return [\n                { offsetX: step  , offsetY: 0     , cost: cost },\n                { offsetX: 0     , offsetY: step  , cost: cost },\n                { offsetX: -step , offsetY: 0     , cost: cost },\n                { offsetX: 0     , offsetY: -step , cost: cost }\n            ]\n        },\n\n        // a penalty received for direction change\n        penalties: function() {\n\n            return {\n                0: 0,\n                45: this.step / 2,\n                90: this.step / 2\n            }\n        },\n\n        // padding applied on the element bounding boxes\n        paddingBox: function() {\n\n            const {step} = this\n\n            return {\n                x: -step,\n                y: -step,\n                width: 2 * step,\n                height: 2 * step\n            }\n        },\n\n        // a router to use when the manhattan router fails\n        // (one of the partial routes returns null)\n        fallbackRouter: function(vertices, opt, linkView) {\n\n            if (!util.isFunction(joint.routers.orthogonal)) {\n                throw new Error('Manhattan requires the orthogonal router as default fallback.')\n            }\n\n            return joint.routers.orthogonal(vertices, util.assign({}, config, opt), linkView)\n        },\n\n        /* Deprecated */\n        // a simple route used in situations when main routing method fails\n        // (exceed max number of loop iterations, inaccessible)\n        fallbackRoute: function(from, to, opt) {\n\n            return null // null result will trigger the fallbackRouter\n\n            // left for reference:\n            /*// Find an orthogonal route ignoring obstacles.\n\n            var point = ((opt.previousDirAngle || 0) % 180 === 0)\n                    ? new g.Point(from.x, to.y)\n                    : new g.Point(to.x, from.y);\n\n            return [point];*/\n        },\n\n        // if a function is provided, it's used to route the link while dragging an end\n        // i.e. function(from, to, opt) { return []; }\n        draggingRoute: null\n    }\n\n    // HELPER CLASSES //\n\n    // Map of obstacles\n    // Helper structure to identify whether a point lies inside an obstacle.\n    function ObstacleMap(opt) {\n\n        this.map = {}\n        this.options = opt\n        // tells how to divide the paper when creating the elements map\n        this.mapGridSize = 100\n    }\n\n    ObstacleMap.prototype.build = function(graph, link) {\n\n        const opt = this.options\n\n        // source or target element could be excluded from set of obstacles\n        const excludedEnds = util.toArray(opt.excludeEnds).reduce(function(res, item) {\n\n            const end = link.get(item)\n            if (end) {\n                const cell = graph.getCell(end.id)\n                if (cell) {\n                    res.push(cell)\n                }\n            }\n\n            return res\n        }, [])\n\n        // Exclude any embedded elements from the source and the target element.\n        let excludedAncestors = []\n\n        const source = graph.getCell(link.get('source').id)\n        if (source) {\n            excludedAncestors = util.union(excludedAncestors, source.getAncestors().map(function(cell) { return cell.id }))\n        }\n\n        const target = graph.getCell(link.get('target').id)\n        if (target) {\n            excludedAncestors = util.union(excludedAncestors, target.getAncestors().map(function(cell) { return cell.id }))\n        }\n\n        // Builds a map of all elements for quicker obstacle queries (i.e. is a point contained\n        // in any obstacle?) (a simplified grid search).\n        // The paper is divided into smaller cells, where each holds information about which\n        // elements belong to it. When we query whether a point lies inside an obstacle we\n        // don't need to go through all obstacles, we check only those in a particular cell.\n        const {mapGridSize} = this\n\n        graph.getElements().reduce(function(map, element) {\n\n            const isExcludedType = util.toArray(opt.excludeTypes).includes(element.get('type'))\n            const isExcludedEnd = excludedEnds.find(function(excluded) { return excluded.id === element.id })\n            const isExcludedAncestor = excludedAncestors.includes(element.id)\n\n            const isExcluded = isExcludedType || isExcludedEnd || isExcludedAncestor\n            if (!isExcluded) {\n                const bbox = element.getBBox().moveAndExpand(opt.paddingBox)\n\n                const origin = bbox.origin().snapToGrid(mapGridSize)\n                const corner = bbox.corner().snapToGrid(mapGridSize)\n\n                for (let {x} = origin; x <= corner.x; x += mapGridSize) {\n                    for (let {y} = origin; y <= corner.y; y += mapGridSize) {\n                        const gridKey = `${x  }@${  y}`\n                        map[gridKey] = map[gridKey] || []\n                        map[gridKey].push(bbox)\n                    }\n                }\n            }\n\n            return map\n        }, this.map)\n\n        return this\n    }\n\n    ObstacleMap.prototype.isPointAccessible = function(point) {\n\n        const mapKey = point.clone().snapToGrid(this.mapGridSize).toString()\n\n        return util.toArray(this.map[mapKey]).every( function(obstacle) {\n            return !obstacle.containsPoint(point)\n        })\n    }\n\n    // Sorted Set\n    // Set of items sorted by given value.\n    function SortedSet() {\n        this.items = []\n        this.hash = {}\n        this.values = {}\n        this.OPEN = 1\n        this.CLOSE = 2\n    }\n\n    SortedSet.prototype.add = function(item, value) {\n\n        if (this.hash[item]) {\n            // item removal\n            this.items.splice(this.items.indexOf(item), 1)\n        } else {\n            this.hash[item] = this.OPEN\n        }\n\n        this.values[item] = value\n\n        const index = joint.util.sortedIndex(this.items, item, function(i) {\n            return this.values[i]\n        }.bind(this))\n\n        this.items.splice(index, 0, item)\n    }\n\n    SortedSet.prototype.remove = function(item) {\n\n        this.hash[item] = this.CLOSE\n    }\n\n    SortedSet.prototype.isOpen = function(item) {\n\n        return this.hash[item] === this.OPEN\n    }\n\n    SortedSet.prototype.isClose = function(item) {\n\n        return this.hash[item] === this.CLOSE\n    }\n\n    SortedSet.prototype.isEmpty = function() {\n\n        return this.items.length === 0\n    }\n\n    SortedSet.prototype.pop = function() {\n\n        const item =  this.items.shift()\n        this.remove(item)\n        return item\n    }\n\n    // HELPERS //\n\n    // return source bbox\n    function getSourceBBox(linkView, opt) {\n\n        // expand by padding box\n        if (opt && opt.paddingBox) return linkView.sourceBBox.clone().moveAndExpand(opt.paddingBox)\n\n        return linkView.sourceBBox.clone()\n    }\n\n    // return target bbox\n    function getTargetBBox(linkView, opt) {\n\n        // expand by padding box\n        if (opt && opt.paddingBox) return linkView.targetBBox.clone().moveAndExpand(opt.paddingBox)\n\n        return linkView.targetBBox.clone()\n    }\n\n    // return source anchor\n    function getSourceAnchor(linkView, opt) {\n\n        if (linkView.sourceAnchor) return linkView.sourceAnchor\n\n        // fallback: center of bbox\n        const sourceBBox = getSourceBBox(linkView, opt)\n        return sourceBBox.center()\n    }\n\n    // return target anchor\n    function getTargetAnchor(linkView, opt) {\n\n        if (linkView.targetAnchor) return linkView.targetAnchor\n\n        // fallback: center of bbox\n        const targetBBox = getTargetBBox(linkView, opt)\n        return targetBBox.center() // default\n    }\n\n    // returns a direction index from start point to end point\n    // corrects for grid deformation between start and end\n    function getDirectionAngle(start, end, numDirections, grid, opt) {\n\n        const quadrant = 360 / numDirections\n        const angleTheta = start.theta(fixAngleEnd(start, end, grid, opt))\n        const normalizedAngle = g.normalizeAngle(angleTheta + (quadrant / 2))\n        return quadrant * Math.floor(normalizedAngle / quadrant)\n    }\n\n    // helper function for getDirectionAngle()\n    // corrects for grid deformation\n    // (if a point is one grid steps away from another in both dimensions,\n    // it is considered to be 45 degrees away, even if the real angle is different)\n    // this causes visible angle discrepancies if `opt.step` is much larger than `paper.gridSize`\n    function fixAngleEnd(start, end, grid, opt) {\n\n        const {step} = opt\n\n        const diffX = end.x - start.x\n        const diffY = end.y - start.y\n\n        const gridStepsX = diffX / grid.x\n        const gridStepsY = diffY / grid.y\n\n        const distanceX = gridStepsX * step\n        const distanceY = gridStepsY * step\n\n        return new g.Point(start.x + distanceX, start.y + distanceY)\n    }\n\n    // return the change in direction between two direction angles\n    function getDirectionChange(angle1, angle2) {\n\n        const directionChange = Math.abs(angle1 - angle2)\n        return (directionChange > 180) ? (360 - directionChange) : directionChange\n    }\n\n    // fix direction offsets according to current grid\n    function getGridOffsets(directions, grid, opt) {\n\n        const {step} = opt\n\n        util.toArray(opt.directions).forEach(function(direction) {\n\n            direction.gridOffsetX = (direction.offsetX / step) * grid.x\n            direction.gridOffsetY = (direction.offsetY / step) * grid.y\n        })\n    }\n\n    // get grid size in x and y dimensions, adapted to source and target positions\n    function getGrid(step, source, target) {\n\n        return {\n            source: source.clone(),\n            x: getGridDimension(target.x - source.x, step),\n            y: getGridDimension(target.y - source.y, step)\n        }\n    }\n\n    // helper function for getGrid()\n    function getGridDimension(diff, step) {\n\n        // return step if diff = 0\n        if (!diff) return step\n\n        const absDiff = Math.abs(diff)\n        const numSteps = Math.round(absDiff / step)\n\n        // return absDiff if less than one step apart\n        if (!numSteps) return absDiff\n\n        // otherwise, return corrected step\n        const roundedDiff = numSteps * step\n        const remainder = absDiff - roundedDiff\n        const stepCorrection = remainder / numSteps\n\n        return step + stepCorrection\n    }\n\n    // return a clone of point snapped to grid\n    function snapToGrid(point, grid) {\n\n        const {source} = grid\n\n        const snappedX = g.snapToGrid(point.x - source.x, grid.x) + source.x\n        const snappedY = g.snapToGrid(point.y - source.y, grid.y) + source.y\n\n        return new g.Point(snappedX, snappedY)\n    }\n\n    // round the point to opt.precision\n    function round(point, opt) {\n\n        if (!point) return point\n\n        return point.round(opt.precision)\n    }\n\n    // return a string representing the point\n    // string is rounded to nearest int in both dimensions\n    function getKey(point) {\n\n        return point.clone().round().toString()\n    }\n\n    // return a normalized vector from given point\n    // used to determine the direction of a difference of two points\n    function normalizePoint(point) {\n\n        return new g.Point(\n            point.x === 0 ? 0 : Math.abs(point.x) / point.x,\n            point.y === 0 ? 0 : Math.abs(point.y) / point.y\n        )\n    }\n\n    // PATHFINDING //\n\n    // reconstructs a route by concatenating points with their parents\n    function reconstructRoute(parents, points, tailPoint, from, to, opt) {\n\n        const route = []\n\n        let prevDiff = normalizePoint(to.difference(tailPoint))\n\n        let currentKey = getKey(tailPoint)\n        let parent = parents[currentKey]\n\n        let point\n        while (parent) {\n\n            point = round(points[currentKey], opt)\n\n            const diff = normalizePoint(point.difference(round(parent.clone(), opt)))\n            if (!diff.equals(prevDiff)) {\n                route.unshift(point)\n                prevDiff = diff\n            }\n\n            currentKey = getKey(parent)\n            parent = parents[currentKey]\n        }\n\n        const leadPoint = round(points[currentKey], opt)\n\n        const fromDiff = normalizePoint(leadPoint.difference(from))\n        if (!fromDiff.equals(prevDiff)) {\n            route.unshift(leadPoint)\n        }\n\n        return route\n    }\n\n    // heuristic method to determine the distance between two points\n    function estimateCost(from, endPoints) {\n\n        let min = Infinity\n\n        for (let i = 0, len = endPoints.length; i < len; i++) {\n            const cost = from.manhattanDistance(endPoints[i])\n            if (cost < min) min = cost\n        }\n\n        return min\n    }\n\n    // find points around the bbox taking given directions into account\n    // lines are drawn from anchor in given directions, intersections recorded\n    // if anchor is outside bbox, only those directions that intersect get a rect point\n    // the anchor itself is returned as rect point (representing some directions)\n    // (since those directions are unobstructed by the bbox)\n    function getRectPoints(anchor, bbox, directionList, grid, opt) {\n\n        const {directionMap} = opt\n\n        const snappedAnchor = round(snapToGrid(anchor, grid), opt)\n        const snappedCenter = round(snapToGrid(bbox.center(), grid), opt)\n        const anchorCenterVector = snappedAnchor.difference(snappedCenter)\n\n        const keys = util.isObject(directionMap) ? Object.keys(directionMap) : []\n        const dirList = util.toArray(directionList)\n        const rectPoints = keys.reduce(function(res, key) {\n\n            if (dirList.includes(key)) {\n                const direction = directionMap[key]\n\n                // create a line that is guaranteed to intersect the bbox if bbox is in the direction\n                // even if anchor lies outside of bbox\n                const endpoint = new g.Point(\n                    snappedAnchor.x + direction.x * (Math.abs(anchorCenterVector.x) + bbox.width),\n                    snappedAnchor.y + direction.y * (Math.abs(anchorCenterVector.y) + bbox.height)\n                )\n                const intersectionLine = new g.Line(anchor, endpoint)\n\n                // get the farther intersection, in case there are two\n                // (that happens if anchor lies next to bbox)\n                const intersections = intersectionLine.intersect(bbox) || []\n                const numIntersections = intersections.length\n                let farthestIntersectionDistance\n                let farthestIntersection = null\n                for (let i = 0; i < numIntersections; i++) {\n                    const currentIntersection = intersections[i]\n                    const distance = snappedAnchor.squaredDistance(currentIntersection)\n                    if (farthestIntersectionDistance === undefined || (distance > farthestIntersectionDistance)) {\n                        farthestIntersectionDistance = distance\n                        farthestIntersection = snapToGrid(currentIntersection, grid)\n                    }\n                }\n                const point = round(farthestIntersection, opt)\n\n                // if an intersection was found in this direction, it is our rectPoint\n                if (point) {\n                    // if the rectPoint lies inside the bbox, offset it by one more step\n                    if (bbox.containsPoint(point)) {\n                        round(point.offset(direction.x * grid.x, direction.y * grid.y), opt)\n                    }\n\n                    // then add the point to the result array\n                    res.push(point)\n                }\n            }\n\n            return res\n        }, [])\n\n        // if anchor lies outside of bbox, add it to the array of points\n        if (!bbox.containsPoint(snappedAnchor)) rectPoints.push(snappedAnchor)\n\n        return rectPoints\n    }\n\n    // finds the route between two points/rectangles (`from`, `to`) implementing A* algorithm\n    // rectangles get rect points assigned by getRectPoints()\n    function findRoute(from, to, map, opt) {\n\n        // Get grid for this route.\n\n        let sourceAnchor; let targetAnchor\n\n        if (from instanceof g.Rect) { // `from` is sourceBBox\n            sourceAnchor = getSourceAnchor(this, opt).clone()\n        } else {\n            sourceAnchor = from.clone()\n        }\n\n        if (to instanceof g.Rect) { // `to` is targetBBox\n            targetAnchor = getTargetAnchor(this, opt).clone()\n        } else {\n            targetAnchor = to.clone()\n        }\n\n        const grid = getGrid(opt.step, sourceAnchor, targetAnchor)\n\n        // Get pathfinding points.\n\n        let start; let end\n        let startPoints; let endPoints\n\n        // set of points we start pathfinding from\n        if (from instanceof g.Rect) { // `from` is sourceBBox\n            start = round(snapToGrid(sourceAnchor, grid), opt)\n            startPoints = getRectPoints(start, from, opt.startDirections, grid, opt)\n\n        } else {\n            start = round(snapToGrid(sourceAnchor, grid), opt)\n            startPoints = [start]\n        }\n\n        // set of points we want the pathfinding to finish at\n        if (to instanceof g.Rect) { // `to` is targetBBox\n            end = round(snapToGrid(targetAnchor, grid), opt)\n            endPoints = getRectPoints(targetAnchor, to, opt.endDirections, grid, opt)\n\n        } else {\n            end = round(snapToGrid(targetAnchor, grid), opt)\n            endPoints = [end]\n        }\n\n        // take into account only accessible rect points (those not under obstacles)\n        startPoints = startPoints.filter(map.isPointAccessible, map)\n        endPoints = endPoints.filter(map.isPointAccessible, map)\n\n        // Check that there is an accessible route point on both sides.\n        // Otherwise, use fallbackRoute().\n        if (startPoints.length > 0 && endPoints.length > 0) {\n\n            // The set of tentative points to be evaluated, initially containing the start points.\n            // Rounded to nearest integer for simplicity.\n            const openSet = new SortedSet()\n            // Keeps reference to actual points for given elements of the open set.\n            const points = {}\n            // Keeps reference to a point that is immediate predecessor of given element.\n            const parents = {}\n            // Cost from start to a point along best known path.\n            const costs = {}\n\n            for (var i = 0, n = startPoints.length; i < n; i++) {\n                const point = startPoints[i]\n\n                const key = getKey(point)\n                openSet.add(key, estimateCost(point, endPoints))\n                points[key] = point\n                costs[key] = 0\n            }\n\n            const previousRouteDirectionAngle = opt.previousDirectionAngle // undefined for first route\n            const isPathBeginning = (previousRouteDirectionAngle === undefined)\n\n            // directions\n            let direction; let directionChange\n            const {directions} = opt\n            getGridOffsets(directions, grid, opt)\n\n            const numDirections = directions.length\n\n            const endPointsKeys = util.toArray(endPoints).reduce(function(res, endPoint) {\n\n                const key = getKey(endPoint)\n                res.push(key)\n                return res\n            }, [])\n\n            // main route finding loop\n            let loopsRemaining = opt.maximumLoops\n            while (!openSet.isEmpty() && loopsRemaining > 0) {\n\n                // remove current from the open list\n                const currentKey = openSet.pop()\n                const currentPoint = points[currentKey]\n                const currentParent = parents[currentKey]\n                const currentCost = costs[currentKey]\n\n                const isRouteBeginning = (currentParent === undefined) // undefined for route starts\n                const isStart = currentPoint.equals(start) // (is source anchor or `from` point) = can leave in any direction\n\n                var previousDirectionAngle\n                if (!isRouteBeginning) previousDirectionAngle = getDirectionAngle(currentParent, currentPoint, numDirections, grid, opt) // a vertex on the route\n                else if (!isPathBeginning) previousDirectionAngle = previousRouteDirectionAngle // beginning of route on the path\n                else if (!isStart) previousDirectionAngle = getDirectionAngle(start, currentPoint, numDirections, grid, opt) // beginning of path, start rect point\n                else previousDirectionAngle = null // beginning of path, source anchor or `from` point\n\n                // check if we reached any endpoint\n                if (endPointsKeys.indexOf(currentKey) >= 0) {\n                    opt.previousDirectionAngle = previousDirectionAngle\n                    return reconstructRoute(parents, points, currentPoint, start, end, opt)\n                }\n\n                // go over all possible directions and find neighbors\n                for (i = 0; i < numDirections; i++) {\n                    direction = directions[i]\n\n                    const directionAngle = direction.angle\n                    directionChange = getDirectionChange(previousDirectionAngle, directionAngle)\n\n                    // if the direction changed rapidly, don't use this point\n                    // any direction is allowed for starting points\n                    if (!(isPathBeginning && isStart) && directionChange > opt.maxAllowedDirectionChange) continue\n\n                    const neighborPoint = currentPoint.clone().offset(direction.gridOffsetX, direction.gridOffsetY)\n                    const neighborKey = getKey(neighborPoint)\n\n                    // Closed points from the openSet were already evaluated.\n                    if (openSet.isClose(neighborKey) || !map.isPointAccessible(neighborPoint)) continue\n\n                    // We can only enter end points at an acceptable angle.\n                    if (endPointsKeys.indexOf(neighborKey) >= 0) { // neighbor is an end point\n                        round(neighborPoint, opt) // remove rounding errors\n\n                        const isNeighborEnd = neighborPoint.equals(end) // (is target anchor or `to` point) = can be entered in any direction\n\n                        if (!isNeighborEnd) {\n                            const endDirectionAngle = getDirectionAngle(neighborPoint, end, numDirections, grid, opt)\n                            const endDirectionChange = getDirectionChange(directionAngle, endDirectionAngle)\n\n                            if (endDirectionChange > opt.maxAllowedDirectionChange) continue\n                        }\n                    }\n\n                    // The current direction is ok.\n\n                    const neighborCost = direction.cost\n                    const neighborPenalty = isStart ? 0 : opt.penalties[directionChange] // no penalties for start point\n                    const costFromStart = currentCost + neighborCost + neighborPenalty\n\n                    if (!openSet.isOpen(neighborKey) || (costFromStart < costs[neighborKey])) {\n                        // neighbor point has not been processed yet\n                        // or the cost of the path from start is lower than previously calculated\n\n                        points[neighborKey] = neighborPoint\n                        parents[neighborKey] = currentPoint\n                        costs[neighborKey] = costFromStart\n                        openSet.add(neighborKey, costFromStart + estimateCost(neighborPoint, endPoints))\n                    }\n                }\n\n                loopsRemaining--\n            }\n        }\n\n        // no route found (`to` point either wasn't accessible or finding route took\n        // way too much calculation)\n        return opt.fallbackRoute.call(this, start, end, opt)\n    }\n\n    // resolve some of the options\n    function resolveOptions(opt) {\n\n        opt.directions = util.result(opt, 'directions')\n        opt.penalties = util.result(opt, 'penalties')\n        opt.paddingBox = util.result(opt, 'paddingBox')\n\n        util.toArray(opt.directions).forEach(function(direction) {\n\n            const point1 = new g.Point(0, 0)\n            const point2 = new g.Point(direction.offsetX, direction.offsetY)\n\n            direction.angle = g.normalizeAngle(point1.theta(point2))\n        })\n    }\n\n    // initialization of the route finding\n    function router(vertices, opt, linkView) {\n\n        resolveOptions(opt)\n\n        // enable/disable linkView perpendicular option\n        linkView.options.perpendicular = !!opt.perpendicular\n\n        const sourceBBox = getSourceBBox(linkView, opt)\n        const targetBBox = getTargetBBox(linkView, opt)\n\n        const sourceAnchor = getSourceAnchor(linkView, opt)\n        //var targetAnchor = getTargetAnchor(linkView, opt);\n\n        // pathfinding\n        const map = (new ObstacleMap(opt)).build(linkView.paper.model, linkView.model)\n        const oldVertices = util.toArray(vertices).map(g.Point)\n        const newVertices = []\n        let tailPoint = sourceAnchor // the origin of first route's grid, does not need snapping\n\n        // find a route by concatenating all partial routes (routes need to pass through vertices)\n        // source -> vertex[1] -> ... -> vertex[n] -> target\n        for (let i = 0, len = oldVertices.length; i <= len; i++) {\n\n            let partialRoute = null\n\n            const from = to || sourceBBox\n            var to = oldVertices[i]\n\n            if (!to) {\n                // this is the last iteration\n                // we ran through all vertices in oldVertices\n                // 'to' is not a vertex.\n\n                to = targetBBox\n\n                // If the target is a point (i.e. it's not an element), we\n                // should use dragging route instead of main routing method if it has been provided.\n                const isEndingAtPoint = !linkView.model.get('source').id || !linkView.model.get('target').id\n\n                if (isEndingAtPoint && util.isFunction(opt.draggingRoute)) {\n                    // Make sure we are passing points only (not rects).\n                    const dragFrom = (from === sourceBBox) ? sourceAnchor : from\n                    const dragTo = to.origin()\n\n                    partialRoute = opt.draggingRoute.call(linkView, dragFrom, dragTo, opt)\n                }\n            }\n\n            // if partial route has not been calculated yet use the main routing method to find one\n            partialRoute = partialRoute || findRoute.call(linkView, from, to, map, opt)\n\n            if (partialRoute === null) { // the partial route cannot be found\n                return opt.fallbackRouter(vertices, opt, linkView)\n            }\n\n            const leadPoint = partialRoute[0]\n\n            // remove the first point if the previous partial route had the same point as last\n            if (leadPoint && leadPoint.equals(tailPoint)) partialRoute.shift()\n\n            // save tailPoint for next iteration\n            tailPoint = partialRoute[partialRoute.length - 1] || tailPoint\n\n            Array.prototype.push.apply(newVertices, partialRoute)\n        }\n\n        return newVertices\n    }\n\n    // public function\n    return function(vertices, opt, linkView) {\n\n        return router(vertices, util.assign({}, config, opt), linkView)\n    }\n\n})(g, joint, joint.util)\n\njoint.routers.metro = (function(util) {\n\n    const config = {\n\n        maxAllowedDirectionChange: 45,\n\n        // cost of a diagonal step\n        diagonalCost: function() {\n\n            const {step} = this\n            return Math.ceil(Math.sqrt(step * step << 1))\n        },\n\n        // an array of directions to find next points on the route\n        // different from start/end directions\n        directions: function() {\n\n            const {step} = this\n            const cost = this.cost()\n            const diagonalCost = this.diagonalCost()\n\n            return [\n                { offsetX: step  , offsetY: 0     , cost: cost },\n                { offsetX: step  , offsetY: step  , cost: diagonalCost },\n                { offsetX: 0     , offsetY: step  , cost: cost },\n                { offsetX: -step , offsetY: step  , cost: diagonalCost },\n                { offsetX: -step , offsetY: 0     , cost: cost },\n                { offsetX: -step , offsetY: -step , cost: diagonalCost },\n                { offsetX: 0     , offsetY: -step , cost: cost },\n                { offsetX: step  , offsetY: -step , cost: diagonalCost }\n            ]\n        },\n\n        // a simple route used in situations when main routing method fails\n        // (exceed max number of loop iterations, inaccessible)\n        fallbackRoute: function(from, to, opt) {\n\n            // Find a route which breaks by 45 degrees ignoring all obstacles.\n\n            const theta = from.theta(to)\n\n            const route = []\n\n            let a = { x: to.x, y: from.y }\n            let b = { x: from.x, y: to.y }\n\n            if (theta % 180 > 90) {\n                const t = a\n                a = b\n                b = t\n            }\n\n            const p1 = (theta % 90) < 45 ? a : b\n            const l1 = new g.Line(from, p1)\n\n            const alpha = 90 * Math.ceil(theta / 90)\n\n            const p2 = g.Point.fromPolar(l1.squaredLength(), g.toRad(alpha + 135), p1)\n            const l2 = new g.Line(to, p2)\n\n            const intersectionPoint = l1.intersection(l2)\n            const point = intersectionPoint || to\n\n            const directionFrom = intersectionPoint ? point : from\n\n            const quadrant = 360 / opt.directions.length\n            const angleTheta = directionFrom.theta(to)\n            const normalizedAngle = g.normalizeAngle(angleTheta + (quadrant / 2))\n            const directionAngle = quadrant * Math.floor(normalizedAngle / quadrant)\n\n            opt.previousDirectionAngle = directionAngle\n\n            if (point) route.push(point.round())\n            route.push(to)\n\n            return route\n        }\n    }\n\n    // public function\n    return function(vertices, opt, linkView) {\n\n        if (!util.isFunction(joint.routers.manhattan)) {\n            throw new Error('Metro requires the manhattan router.')\n        }\n\n        return joint.routers.manhattan(vertices, util.assign({}, config, opt), linkView)\n    }\n\n})(joint.util)\n\n// Does not make any changes to vertices.\n// Returns the arguments that are passed to it, unchanged.\njoint.routers.normal = function(vertices, opt, linkView) {\n\n    return vertices\n}\n\n// Routes the link always to/from a certain side\n//\n// Arguments:\n//   padding ... gap between the element and the first vertex. :: Default 40.\n//   side ... 'left' | 'right' | 'top' | 'bottom' :: Default 'bottom'.\n//\njoint.routers.oneSide = function(vertices, opt, linkView) {\n\n    const side = opt.side || 'bottom'\n    const padding = opt.padding || 40\n\n    // LinkView contains cached source an target bboxes.\n    // Note that those are Geometry rectangle objects.\n    const {sourceBBox} = linkView\n    const {targetBBox} = linkView\n    const sourcePoint = sourceBBox.center()\n    const targetPoint = targetBBox.center()\n\n    let coordinate; let dimension; let direction\n\n    switch (side) {\n        case 'bottom':\n            direction = 1\n            coordinate = 'y'\n            dimension = 'height'\n            break\n        case 'top':\n            direction = -1\n            coordinate = 'y'\n            dimension = 'height'\n            break\n        case 'left':\n            direction = -1\n            coordinate = 'x'\n            dimension = 'width'\n            break\n        case 'right':\n            direction = 1\n            coordinate = 'x'\n            dimension = 'width'\n            break\n        default:\n            throw new Error('Router: invalid side')\n    }\n\n    // move the points from the center of the element to outside of it.\n    sourcePoint[coordinate] += direction * (sourceBBox[dimension] / 2 + padding)\n    targetPoint[coordinate] += direction * (targetBBox[dimension] / 2 + padding)\n\n    // make link orthogonal (at least the first and last vertex).\n    if (direction * (sourcePoint[coordinate] - targetPoint[coordinate]) > 0) {\n        targetPoint[coordinate] = sourcePoint[coordinate]\n    } else {\n        sourcePoint[coordinate] = targetPoint[coordinate]\n    }\n\n    return [sourcePoint].concat(vertices, targetPoint)\n}\n\njoint.routers.orthogonal = (function(util) {\n\n    // bearing -> opposite bearing\n    const opposites = {\n        N: 'S',\n        S: 'N',\n        E: 'W',\n        W: 'E'\n    }\n\n    // bearing -> radians\n    const radians = {\n        N: -Math.PI / 2 * 3,\n        S: -Math.PI / 2,\n        E: 0,\n        W: Math.PI\n    }\n\n    // HELPERS //\n\n    // returns a point `p` where lines p,p1 and p,p2 are perpendicular and p is not contained\n    // in the given box\n    function freeJoin(p1, p2, bbox) {\n\n        let p = new g.Point(p1.x, p2.y)\n        if (bbox.containsPoint(p)) p = new g.Point(p2.x, p1.y)\n        // kept for reference\n        // if (bbox.containsPoint(p)) p = null;\n\n        return p\n    }\n\n    // returns either width or height of a bbox based on the given bearing\n    function getBBoxSize(bbox, bearing) {\n\n        return bbox[(bearing === 'W' || bearing === 'E') ? 'width' : 'height']\n    }\n\n    // simple bearing method (calculates only orthogonal cardinals)\n    function getBearing(from, to) {\n\n        if (from.x === to.x) return (from.y > to.y) ? 'N' : 'S'\n        if (from.y === to.y) return (from.x > to.x) ? 'W' : 'E'\n        return null\n    }\n\n    // transform point to a rect\n    function getPointBox(p) {\n\n        return new g.Rect(p.x, p.y, 0, 0)\n    }\n\n    // return source bbox\n    function getSourceBBox(linkView, opt) {\n\n        const padding = (opt && opt.elementPadding) || 20\n        return linkView.sourceBBox.clone().inflate(padding)\n    }\n\n    // return target bbox\n    function getTargetBBox(linkView, opt) {\n\n        const padding = (opt && opt.elementPadding) || 20\n        return linkView.targetBBox.clone().inflate(padding)\n    }\n\n    // return source anchor\n    function getSourceAnchor(linkView, opt) {\n\n        if (linkView.sourceAnchor) return linkView.sourceAnchor\n\n        // fallback: center of bbox\n        const sourceBBox = getSourceBBox(linkView, opt)\n        return sourceBBox.center()\n    }\n\n    // return target anchor\n    function getTargetAnchor(linkView, opt) {\n\n        if (linkView.targetAnchor) return linkView.targetAnchor\n\n        // fallback: center of bbox\n        const targetBBox = getTargetBBox(linkView, opt)\n        return targetBBox.center() // default\n    }\n\n    // PARTIAL ROUTERS //\n\n    function vertexVertex(from, to, bearing) {\n\n        const p1 = new g.Point(from.x, to.y)\n        const p2 = new g.Point(to.x, from.y)\n        const d1 = getBearing(from, p1)\n        const d2 = getBearing(from, p2)\n        const opposite = opposites[bearing]\n\n        const p = (d1 === bearing || (d1 !== opposite && (d2 === opposite || d2 !== bearing))) ? p1 : p2\n\n        return { points: [p], direction: getBearing(p, to) }\n    }\n\n    function elementVertex(from, to, fromBBox) {\n\n        const p = freeJoin(from, to, fromBBox)\n\n        return { points: [p], direction: getBearing(p, to) }\n    }\n\n    function vertexElement(from, to, toBBox, bearing) {\n\n        const route = {}\n\n        const points = [new g.Point(from.x, to.y), new g.Point(to.x, from.y)]\n        const freePoints = points.filter(function(pt) { return !toBBox.containsPoint(pt) })\n        const freeBearingPoints = freePoints.filter(function(pt) { return getBearing(pt, from) !== bearing })\n\n        let p\n\n        if (freeBearingPoints.length > 0) {\n            // Try to pick a point which bears the same direction as the previous segment.\n\n            p = freeBearingPoints.filter(function(pt) { return getBearing(from, pt) === bearing }).pop()\n            p = p || freeBearingPoints[0]\n\n            route.points = [p]\n            route.direction = getBearing(p, to)\n\n        } else {\n            // Here we found only points which are either contained in the element or they would create\n            // a link segment going in opposite direction from the previous one.\n            // We take the point inside element and move it outside the element in the direction the\n            // route is going. Now we can join this point with the current end (using freeJoin).\n\n            p = util.difference(points, freePoints)[0]\n\n            const p2 = (new g.Point(to)).move(p, -getBBoxSize(toBBox, bearing) / 2)\n            const p1 = freeJoin(p2, from, toBBox)\n\n            route.points = [p1, p2]\n            route.direction = getBearing(p2, to)\n        }\n\n        return route\n    }\n\n    function elementElement(from, to, fromBBox, toBBox) {\n\n        let route = elementVertex(to, from, toBBox)\n        const p1 = route.points[0]\n\n        if (fromBBox.containsPoint(p1)) {\n\n            route = elementVertex(from, to, fromBBox)\n            const p2 = route.points[0]\n\n            if (toBBox.containsPoint(p2)) {\n\n                const fromBorder = (new g.Point(from)).move(p2, -getBBoxSize(fromBBox, getBearing(from, p2)) / 2)\n                const toBorder = (new g.Point(to)).move(p1, -getBBoxSize(toBBox, getBearing(to, p1)) / 2)\n                const mid = (new g.Line(fromBorder, toBorder)).midpoint()\n\n                const startRoute = elementVertex(from, mid, fromBBox)\n                const endRoute = vertexVertex(mid, to, startRoute.direction)\n\n                route.points = [startRoute.points[0], endRoute.points[0]]\n                route.direction = endRoute.direction\n            }\n        }\n\n        return route\n    }\n\n    // Finds route for situations where one element is inside the other.\n    // Typically the route is directed outside the outer element first and\n    // then back towards the inner element.\n    function insideElement(from, to, fromBBox, toBBox, bearing) {\n\n        const route = {}\n        const boundary = fromBBox.union(toBBox).inflate(1)\n\n        // start from the point which is closer to the boundary\n        const reversed = boundary.center().distance(to) > boundary.center().distance(from)\n        const start = reversed ? to : from\n        const end = reversed ? from : to\n\n        let p1; let p2; let p3\n\n        if (bearing) {\n            // Points on circle with radius equals 'W + H` are always outside the rectangle\n            // with width W and height H if the center of that circle is the center of that rectangle.\n            p1 = g.Point.fromPolar(boundary.width + boundary.height, radians[bearing], start)\n            p1 = boundary.pointNearestToPoint(p1).move(p1, -1)\n\n        } else {\n            p1 = boundary.pointNearestToPoint(start).move(start, 1)\n        }\n\n        p2 = freeJoin(p1, end, boundary)\n\n        if (p1.round().equals(p2.round())) {\n            p2 = g.Point.fromPolar(boundary.width + boundary.height, g.toRad(p1.theta(start)) + Math.PI / 2, end)\n            p2 = boundary.pointNearestToPoint(p2).move(end, 1).round()\n            p3 = freeJoin(p1, p2, boundary)\n            route.points = reversed ? [p2, p3, p1] : [p1, p3, p2]\n\n        } else {\n            route.points = reversed ? [p2, p1] : [p1, p2]\n        }\n\n        route.direction = reversed ? getBearing(p1, to) : getBearing(p2, to)\n\n        return route\n    }\n\n    // MAIN ROUTER //\n\n    // Return points through which a connection needs to be drawn in order to obtain an orthogonal link\n    // routing from source to target going through `vertices`.\n    function router(vertices, opt, linkView) {\n\n        const padding = opt.elementPadding || 20\n\n        let sourceBBox = getSourceBBox(linkView, opt)\n        let targetBBox = getTargetBBox(linkView, opt)\n\n        const sourceAnchor = getSourceAnchor(linkView, opt)\n        const targetAnchor = getTargetAnchor(linkView, opt)\n\n        // if anchor lies outside of bbox, the bbox expands to include it\n        sourceBBox = sourceBBox.union(getPointBox(sourceAnchor))\n        targetBBox = targetBBox.union(getPointBox(targetAnchor))\n\n        vertices = util.toArray(vertices).map(g.Point)\n        vertices.unshift(sourceAnchor)\n        vertices.push(targetAnchor)\n\n        let bearing // bearing of previous route segment\n\n        const orthogonalVertices = [] // the array of found orthogonal vertices to be returned\n        for (let i = 0, max = vertices.length - 1; i < max; i++) {\n\n            let route = null\n\n            const from = vertices[i]\n            const to = vertices[i + 1]\n\n            const isOrthogonal = !!getBearing(from, to)\n\n            if (i === 0) { // source\n\n                if (i + 1 === max) { // route source -> target\n\n                    // Expand one of the elements by 1px to detect situations when the two\n                    // elements are positioned next to each other with no gap in between.\n                    if (sourceBBox.intersect(targetBBox.clone().inflate(1))) {\n                        route = insideElement(from, to, sourceBBox, targetBBox)\n\n                    } else if (!isOrthogonal) {\n                        route = elementElement(from, to, sourceBBox, targetBBox)\n                    }\n\n                } else { // route source -> vertex\n\n                    if (sourceBBox.containsPoint(to)) {\n                        route = insideElement(from, to, sourceBBox, getPointBox(to).inflate(padding))\n\n                    } else if (!isOrthogonal) {\n                        route = elementVertex(from, to, sourceBBox)\n                    }\n                }\n\n            } else if (i + 1 === max) { // route vertex -> target\n\n                // prevent overlaps with previous line segment\n                const isOrthogonalLoop = isOrthogonal && getBearing(to, from) === bearing\n\n                if (targetBBox.containsPoint(from) || isOrthogonalLoop) {\n                    route = insideElement(from, to, getPointBox(from).inflate(padding), targetBBox, bearing)\n\n                } else if (!isOrthogonal) {\n                    route = vertexElement(from, to, targetBBox, bearing)\n                }\n\n            } else if (!isOrthogonal) { // route vertex -> vertex\n                route = vertexVertex(from, to, bearing)\n            }\n\n            // applicable to all routes:\n\n            // set bearing for next iteration\n            if (route) {\n                Array.prototype.push.apply(orthogonalVertices, route.points)\n                bearing = route.direction\n\n            } else {\n                // orthogonal route and not looped\n                bearing = getBearing(from, to)\n            }\n\n            // push `to` point to identified orthogonal vertices array\n            if (i + 1 < max) {\n                orthogonalVertices.push(to)\n            }\n        }\n\n        return orthogonalVertices\n    }\n\n    return router\n\n})(joint.util)\n\njoint.connectors.normal = function(sourcePoint, targetPoint, route, opt) {\n\n    const raw = opt && opt.raw\n    const points = [sourcePoint].concat(route).concat([targetPoint])\n\n    const polyline = new g.Polyline(points)\n    const path = new g.Path(polyline)\n\n    return (raw) ? path : path.serialize()\n}\n\njoint.connectors.rounded = function(sourcePoint, targetPoint, route, opt) {\n\n    opt || (opt = {})\n\n    const offset = opt.radius || 10\n    const {raw} = opt\n    const path = new g.Path()\n    let segment\n\n    segment = g.Path.createSegment('M', sourcePoint)\n    path.appendSegment(segment)\n\n    const _13 = 1 / 3\n    const _23 = 2 / 3\n\n    let curr\n    let prev; let next\n    let prevDistance; let nextDistance\n    let startMove; let endMove\n    let roundedStart; let roundedEnd\n    let control1; let control2\n\n    for (let index = 0, n = route.length; index < n; index++) {\n\n        curr = new g.Point(route[index])\n\n        prev = route[index - 1] || sourcePoint\n        next = route[index + 1] || targetPoint\n\n        prevDistance = nextDistance || (curr.distance(prev) / 2)\n        nextDistance = curr.distance(next) / 2\n\n        startMove = -Math.min(offset, prevDistance)\n        endMove = -Math.min(offset, nextDistance)\n\n        roundedStart = curr.clone().move(prev, startMove).round()\n        roundedEnd = curr.clone().move(next, endMove).round()\n\n        control1 = new g.Point((_13 * roundedStart.x) + (_23 * curr.x), (_23 * curr.y) + (_13 * roundedStart.y))\n        control2 = new g.Point((_13 * roundedEnd.x) + (_23 * curr.x), (_23 * curr.y) + (_13 * roundedEnd.y))\n\n        segment = g.Path.createSegment('L', roundedStart)\n        path.appendSegment(segment)\n\n        segment = g.Path.createSegment('C', control1, control2, roundedEnd)\n        path.appendSegment(segment)\n    }\n\n    segment = g.Path.createSegment('L', targetPoint)\n    path.appendSegment(segment)\n\n    return (raw) ? path : path.serialize()\n}\n\njoint.connectors.smooth = function(sourcePoint, targetPoint, route, opt) {\n\n    const raw = opt && opt.raw\n    let path\n\n    if (route && route.length !== 0) {\n\n        const points = [sourcePoint].concat(route).concat([targetPoint])\n        const curves = g.Curve.throughPoints(points)\n\n        path = new g.Path(curves)\n\n    } else {\n        // if we have no route, use a default cubic bezier curve\n        // cubic bezier requires two control points\n        // the control points have `x` midway between source and target\n        // this produces an S-like curve\n\n        path = new g.Path()\n\n        let segment\n\n        segment = g.Path.createSegment('M', sourcePoint)\n        path.appendSegment(segment)\n\n        if ((Math.abs(sourcePoint.x - targetPoint.x)) >= (Math.abs(sourcePoint.y - targetPoint.y))) {\n            const controlPointX = (sourcePoint.x + targetPoint.x) / 2\n\n            segment = g.Path.createSegment('C', controlPointX, sourcePoint.y, controlPointX, targetPoint.y, targetPoint.x, targetPoint.y)\n            path.appendSegment(segment)\n\n        } else {\n            const controlPointY = (sourcePoint.y + targetPoint.y) / 2\n\n            segment = g.Path.createSegment('C', sourcePoint.x, controlPointY, targetPoint.x, controlPointY, targetPoint.x, targetPoint.y)\n            path.appendSegment(segment)\n\n        }\n    }\n\n    return (raw) ? path : path.serialize()\n}\n\njoint.connectors.jumpover = (function(g, util) {\n\n    // default size of jump if not specified in options\n    const JUMP_SIZE = 5\n\n    // available jump types\n    // first one taken as default\n    const JUMP_TYPES = ['arc', 'gap', 'cubic']\n\n    // takes care of math. error for case when jump is too close to end of line\n    const CLOSE_PROXIMITY_PADDING = 1\n\n    // list of connector types not to jump over.\n    const IGNORED_CONNECTORS = ['smooth']\n\n    /**\n     * Transform start/end and route into series of lines\n     * @param {g.point} sourcePoint start point\n     * @param {g.point} targetPoint end point\n     * @param {g.point[]} route optional list of route\n     * @return {g.line[]} [description]\n     */\n    function createLines(sourcePoint, targetPoint, route) {\n        // make a flattened array of all points\n        const points = [].concat(sourcePoint, route, targetPoint)\n        return points.reduce(function(resultLines, point, idx) {\n            // if there is a next point, make a line with it\n            const nextPoint = points[idx + 1]\n            if (nextPoint != null) {\n                resultLines[idx] = g.line(point, nextPoint)\n            }\n            return resultLines\n        }, [])\n    }\n\n    function setupUpdating(jumpOverLinkView) {\n        let updateList = jumpOverLinkView.paper._jumpOverUpdateList\n\n        // first time setup for this paper\n        if (updateList == null) {\n            updateList = jumpOverLinkView.paper._jumpOverUpdateList = []\n            jumpOverLinkView.paper.on('cell:pointerup', updateJumpOver)\n            jumpOverLinkView.paper.model.on('reset', function() {\n                updateList = jumpOverLinkView.paper._jumpOverUpdateList = []\n            })\n        }\n\n        // add this link to a list so it can be updated when some other link is updated\n        if (updateList.indexOf(jumpOverLinkView) < 0) {\n            updateList.push(jumpOverLinkView)\n\n            // watch for change of connector type or removal of link itself\n            // to remove the link from a list of jump over connectors\n            jumpOverLinkView.listenToOnce(jumpOverLinkView.model, 'change:connector remove', function() {\n                updateList.splice(updateList.indexOf(jumpOverLinkView), 1)\n            })\n        }\n    }\n\n    /**\n     * Handler for a batch:stop event to force\n     * update of all registered links with jump over connector\n     * @param {object} batchEvent optional object with info about batch\n     */\n    function updateJumpOver() {\n        const updateList = this._jumpOverUpdateList\n        for (let i = 0; i < updateList.length; i++) {\n            updateList[i].update()\n        }\n    }\n\n    /**\n     * Utility function to collect all intersection poinst of a single\n     * line against group of other lines.\n     * @param {g.line} line where to find points\n     * @param {g.line[]} crossCheckLines lines to cross\n     * @return {g.point[]} list of intersection points\n     */\n    function findLineIntersections(line, crossCheckLines) {\n        return util.toArray(crossCheckLines).reduce(function(res, crossCheckLine) {\n            const intersection = line.intersection(crossCheckLine)\n            if (intersection) {\n                res.push(intersection)\n            }\n            return res\n        }, [])\n    }\n\n    /**\n     * Sorting function for list of points by their distance.\n     * @param {g.point} p1 first point\n     * @param {g.point} p2 second point\n     * @return {number} squared distance between points\n     */\n    function sortPoints(p1, p2) {\n        return g.line(p1, p2).squaredLength()\n    }\n\n    /**\n     * Split input line into multiple based on intersection points.\n     * @param {g.line} line input line to split\n     * @param {g.point[]} intersections poinst where to split the line\n     * @param {number} jumpSize the size of jump arc (length empty spot on a line)\n     * @return {g.line[]} list of lines being split\n     */\n    function createJumps(line, intersections, jumpSize) {\n        return intersections.reduce(function(resultLines, point, idx) {\n            // skipping points that were merged with the previous line\n            // to make bigger arc over multiple lines that are close to each other\n            if (point.skip === true) {\n                return resultLines\n            }\n\n            // always grab the last line from buffer and modify it\n            const lastLine = resultLines.pop() || line\n\n            // calculate start and end of jump by moving by a given size of jump\n            const jumpStart = g.point(point).move(lastLine.start, -(jumpSize))\n            let jumpEnd = g.point(point).move(lastLine.start, +(jumpSize))\n\n            // now try to look at the next intersection point\n            const nextPoint = intersections[idx + 1]\n            if (nextPoint != null) {\n                const distance = jumpEnd.distance(nextPoint)\n                if (distance <= jumpSize) {\n                    // next point is close enough, move the jump end by this\n                    // difference and mark the next point to be skipped\n                    jumpEnd = nextPoint.move(lastLine.start, distance)\n                    nextPoint.skip = true\n                }\n            } else {\n                // this block is inside of `else` as an optimization so the distance is\n                // not calculated when we know there are no other intersection points\n                const endDistance = jumpStart.distance(lastLine.end)\n                // if the end is too close to possible jump, draw remaining line instead of a jump\n                if (endDistance < jumpSize * 2 + CLOSE_PROXIMITY_PADDING) {\n                    resultLines.push(lastLine)\n                    return resultLines\n                }\n            }\n\n            const startDistance = jumpEnd.distance(lastLine.start)\n            if (startDistance < jumpSize * 2 + CLOSE_PROXIMITY_PADDING) {\n                // if the start of line is too close to jump, draw that line instead of a jump\n                resultLines.push(lastLine)\n                return resultLines\n            }\n\n            // finally create a jump line\n            const jumpLine = g.line(jumpStart, jumpEnd)\n            // it's just simple line but with a `isJump` property\n            jumpLine.isJump = true\n\n            resultLines.push(\n                g.line(lastLine.start, jumpStart),\n                jumpLine,\n                g.line(jumpEnd, lastLine.end)\n            )\n            return resultLines\n        }, [])\n    }\n\n    /**\n     * Assemble `D` attribute of a SVG path by iterating given lines.\n     * @param {g.line[]} lines source lines to use\n     * @param {number} jumpSize the size of jump arc (length empty spot on a line)\n     * @return {string}\n     */\n    function buildPath(lines, jumpSize, jumpType) {\n\n        const path = new g.Path()\n        let segment\n\n        // first move to the start of a first line\n        segment = g.Path.createSegment('M', lines[0].start)\n        path.appendSegment(segment)\n\n        // make a paths from lines\n        joint.util.toArray(lines).forEach(function(line, index) {\n\n            if (line.isJump) {\n                let angle; let diff\n\n                let control1; let control2\n\n                if (jumpType === 'arc') { // approximates semicircle with 2 curves\n                    angle = -90\n                    // determine rotation of arc based on difference between points\n                    diff = line.start.difference(line.end)\n                    // make sure the arc always points up (or right)\n                    var xAxisRotate = Number((diff.x < 0) || (diff.x === 0 && diff.y < 0))\n                    if (xAxisRotate) angle += 180\n\n                    const midpoint = line.midpoint()\n                    const centerLine = new g.Line(midpoint, line.end).rotate(midpoint, angle)\n\n                    let halfLine\n\n                    // first half\n                    halfLine = new g.Line(line.start, midpoint)\n\n                    control1 = halfLine.pointAt(2 / 3).rotate(line.start, angle)\n                    control2 = centerLine.pointAt(1 / 3).rotate(centerLine.end, -angle)\n\n                    segment = g.Path.createSegment('C', control1, control2, centerLine.end)\n                    path.appendSegment(segment)\n\n                    // second half\n                    halfLine = new g.Line(midpoint, line.end)\n\n                    control1 = centerLine.pointAt(1 / 3).rotate(centerLine.end, angle)\n                    control2 = halfLine.pointAt(1 / 3).rotate(line.end, -angle)\n\n                    segment = g.Path.createSegment('C', control1, control2, line.end)\n                    path.appendSegment(segment)\n\n                } else if (jumpType === 'gap') {\n                    segment = g.Path.createSegment('M', line.end)\n                    path.appendSegment(segment)\n\n                } else if (jumpType === 'cubic') { // approximates semicircle with 1 curve\n                    angle = line.start.theta(line.end)\n\n                    const xOffset = jumpSize * 0.6\n                    let yOffset = jumpSize * 1.35\n\n                    // determine rotation of arc based on difference between points\n                    diff = line.start.difference(line.end)\n                    // make sure the arc always points up (or right)\n                    xAxisRotate = Number((diff.x < 0) || (diff.x === 0 && diff.y < 0))\n                    if (xAxisRotate) yOffset *= -1\n\n                    control1 = g.Point(line.start.x + xOffset, line.start.y + yOffset).rotate(line.start, angle)\n                    control2 = g.Point(line.end.x - xOffset, line.end.y + yOffset).rotate(line.end, angle)\n\n                    segment = g.Path.createSegment('C', control1, control2, line.end)\n                    path.appendSegment(segment)\n                }\n\n            } else {\n                segment = g.Path.createSegment('L', line.end)\n                path.appendSegment(segment)\n            }\n        })\n\n        return path\n    }\n\n    /**\n     * Actual connector function that will be run on every update.\n     * @param {g.point} sourcePoint start point of this link\n     * @param {g.point} targetPoint end point of this link\n     * @param {g.point[]} route of this link\n     * @param {object} opt options\n     * @property {number} size optional size of a jump arc\n     * @return {string} created `D` attribute of SVG path\n     */\n    return function(sourcePoint, targetPoint, route, opt) { // eslint-disable-line max-params\n\n        setupUpdating(this)\n\n        const {raw} = opt\n        const jumpSize = opt.size || JUMP_SIZE\n        let jumpType = opt.jump && (`${  opt.jump}`).toLowerCase()\n        const ignoreConnectors = opt.ignoreConnectors || IGNORED_CONNECTORS\n\n        // grab the first jump type as a default if specified one is invalid\n        if (JUMP_TYPES.indexOf(jumpType) === -1) {\n            jumpType = JUMP_TYPES[0]\n        }\n\n        const {paper} = this\n        const graph = paper.model\n        const allLinks = graph.getLinks()\n\n        // there is just one link, draw it directly\n        if (allLinks.length === 1) {\n            return buildPath(\n                createLines(sourcePoint, targetPoint, route),\n                jumpSize, jumpType\n            )\n        }\n\n        const thisModel = this.model\n        const thisIndex = allLinks.indexOf(thisModel)\n        const defaultConnector = paper.options.defaultConnector || {}\n\n        // not all links are meant to be jumped over.\n        const links = allLinks.filter(function(link, idx) {\n\n            const connector = link.get('connector') || defaultConnector\n\n            // avoid jumping over links with connector type listed in `ignored connectors`.\n            if (util.toArray(ignoreConnectors).includes(connector.name)) {\n                return false\n            }\n            // filter out links that are above this one and  have the same connector type\n            // otherwise there would double hoops for each intersection\n            if (idx > thisIndex) {\n                return connector.name !== 'jumpover'\n            }\n            return true\n        })\n\n        // find views for all links\n        const linkViews = links.map(function(link) {\n            return paper.findViewByModel(link)\n        })\n\n        // create lines for this link\n        const thisLines = createLines(\n            sourcePoint,\n            targetPoint,\n            route\n        )\n\n        // create lines for all other links\n        const linkLines = linkViews.map(function(linkView) {\n            if (linkView == null) {\n                return []\n            }\n            if (linkView === this) {\n                return thisLines\n            }\n            return createLines(\n                linkView.sourcePoint,\n                linkView.targetPoint,\n                linkView.route\n            )\n        }, this)\n\n        // transform lines for this link by splitting with jump lines at\n        // points of intersection with other links\n        const jumpingLines = thisLines.reduce(function(resultLines, thisLine) {\n            // iterate all links and grab the intersections with this line\n            // these are then sorted by distance so the line can be split more easily\n\n            const intersections = links.reduce(function(res, link, i) {\n                // don't intersection with itself\n                if (link !== thisModel) {\n\n                    const lineIntersections = findLineIntersections(thisLine, linkLines[i])\n                    res.push.apply(res, lineIntersections)\n                }\n                return res\n            }, []).sort(function(a, b) {\n                return sortPoints(thisLine.start, a) - sortPoints(thisLine.start, b)\n            })\n\n            if (intersections.length > 0) {\n                // split the line based on found intersection points\n                resultLines.push.apply(resultLines, createJumps(thisLine, intersections, jumpSize))\n            } else {\n                // without any intersection the line goes uninterrupted\n                resultLines.push(thisLine)\n            }\n            return resultLines\n        }, [])\n\n        const path = buildPath(jumpingLines, jumpSize, jumpType)\n        return (raw) ? path : path.serialize()\n    }\n}(g, joint.util));\n\n(function(g, joint, util) {\n\n    function portTransformAttrs(point, angle, opt) {\n\n        const trans = point.toJSON()\n\n        trans.angle = angle || 0\n\n        return joint.util.defaults({}, opt, trans)\n    }\n\n    function lineLayout(ports, p1, p2) {\n        return ports.map(function(port, index, ports) {\n            const p = this.pointAt(((index + 0.5) / ports.length))\n            // `dx`,`dy` per port offset option\n            if (port.dx || port.dy) {\n                p.offset(port.dx || 0, port.dy || 0)\n            }\n\n            return portTransformAttrs(p.round(), 0, port)\n        }, g.line(p1, p2))\n    }\n\n    function ellipseLayout(ports, elBBox, startAngle, stepFn) {\n\n        const center = elBBox.center()\n        const ratio = elBBox.width / elBBox.height\n        const p1 = elBBox.topMiddle()\n\n        const ellipse = g.Ellipse.fromRect(elBBox)\n\n        return ports.map(function(port, index, ports) {\n\n            const angle = startAngle + stepFn(index, ports.length)\n            const p2 = p1.clone()\n                .rotate(center, -angle)\n                .scale(ratio, 1, center)\n\n            const theta = port.compensateRotation ? -ellipse.tangentTheta(p2) : 0\n\n            // `dx`,`dy` per port offset option\n            if (port.dx || port.dy) {\n                p2.offset(port.dx || 0, port.dy || 0)\n            }\n\n            // `dr` delta radius option\n            if (port.dr) {\n                p2.move(center, port.dr)\n            }\n\n            return portTransformAttrs(p2.round(), theta, port)\n        })\n    }\n\n    // Creates a point stored in arguments\n    function argPoint(bbox, args) {\n\n        let {x} = args\n        if (util.isString(x)) {\n            x = parseFloat(x) / 100 * bbox.width\n        }\n\n        let {y} = args\n        if (util.isString(y)) {\n            y = parseFloat(y) / 100 * bbox.height\n        }\n\n        return g.point(x || 0, y || 0)\n    }\n\n    joint.layout.Port = {\n\n        /**\n         * @param {Array<Object>} ports\n         * @param {g.Rect} elBBox\n         * @param {Object=} opt opt Group options\n         * @returns {Array<g.Point>}\n         */\n        absolute: function(ports, elBBox, opt) {\n            //TODO v.talas angle\n            return ports.map(argPoint.bind(null, elBBox))\n        },\n\n        /**\n         * @param {Array<Object>} ports\n         * @param {g.Rect} elBBox\n         * @param {Object=} opt opt Group options\n         * @returns {Array<g.Point>}\n         */\n        fn: function(ports, elBBox, opt) {\n            return opt.fn(ports, elBBox, opt)\n        },\n\n        /**\n         * @param {Array<Object>} ports\n         * @param {g.Rect} elBBox\n         * @param {Object=} opt opt Group options\n         * @returns {Array<g.Point>}\n         */\n        line: function(ports, elBBox, opt) {\n\n            const start = argPoint(elBBox, opt.start || elBBox.origin())\n            const end = argPoint(elBBox, opt.end || elBBox.corner())\n\n            return lineLayout(ports, start, end)\n        },\n\n        /**\n         * @param {Array<Object>} ports\n         * @param {g.Rect} elBBox\n         * @param {Object=} opt opt Group options\n         * @returns {Array<g.Point>}\n         */\n        left: function(ports, elBBox, opt) {\n            return lineLayout(ports, elBBox.origin(), elBBox.bottomLeft())\n        },\n\n        /**\n         * @param {Array<Object>} ports\n         * @param {g.Rect} elBBox\n         * @param {Object=} opt opt Group options\n         * @returns {Array<g.Point>}\n         */\n        right: function(ports, elBBox, opt) {\n            return lineLayout(ports, elBBox.topRight(), elBBox.corner())\n        },\n\n        /**\n         * @param {Array<Object>} ports\n         * @param {g.Rect} elBBox\n         * @param {Object=} opt opt Group options\n         * @returns {Array<g.Point>}\n         */\n        top: function(ports, elBBox, opt) {\n            return lineLayout(ports, elBBox.origin(), elBBox.topRight())\n        },\n\n        /**\n         * @param {Array<Object>} ports\n         * @param {g.Rect} elBBox\n         * @param {Object=} opt opt Group options\n         * @returns {Array<g.Point>}\n         */\n        bottom: function(ports, elBBox, opt) {\n            return lineLayout(ports, elBBox.bottomLeft(), elBBox.corner())\n        },\n\n        /**\n         * @param {Array<Object>} ports\n         * @param {g.Rect} elBBox\n         * @param {Object=} opt Group options\n         * @returns {Array<g.Point>}\n         */\n        ellipseSpread: function(ports, elBBox, opt) {\n\n            const startAngle = opt.startAngle || 0\n            const stepAngle = opt.step || 360 / ports.length\n\n            return ellipseLayout(ports, elBBox, startAngle, function(index) {\n                return index * stepAngle\n            })\n        },\n\n        /**\n         * @param {Array<Object>} ports\n         * @param {g.Rect} elBBox\n         * @param {Object=} opt Group options\n         * @returns {Array<g.Point>}\n         */\n        ellipse: function(ports, elBBox, opt) {\n\n            const startAngle = opt.startAngle || 0\n            const stepAngle = opt.step || 20\n\n            return ellipseLayout(ports, elBBox, startAngle, function(index, count) {\n                return (index + 0.5 - count / 2) * stepAngle\n            })\n        }\n    }\n\n})(g, joint, joint.util);\n\n(function(g, joint, util) {\n\n    function labelAttributes(opt1, opt2) {\n\n        return util.defaultsDeep({}, opt1, opt2, {\n            x: 0,\n            y: 0,\n            angle: 0,\n            attrs: {\n                '.': {\n                    y: '0',\n                    'text-anchor': 'start'\n                }\n            }\n        })\n\n    }\n\n    function outsideLayout(portPosition, elBBox, autoOrient, opt) {\n\n        opt = util.defaults({}, opt, { offset: 15 })\n        const angle = elBBox.center().theta(portPosition)\n        const x = getBBoxAngles(elBBox)\n\n        let tx; let ty; let y; let textAnchor\n        const {offset} = opt\n        let orientAngle = 0\n\n        if (angle < x[1] || angle > x[2]) {\n            y = '.3em'\n            tx = offset\n            ty = 0\n            textAnchor = 'start'\n        } else if (angle < x[0]) {\n            y = '0'\n            tx = 0\n            ty = -offset\n            if (autoOrient) {\n                orientAngle = -90\n                textAnchor = 'start'\n            } else {\n                textAnchor = 'middle'\n            }\n        } else if (angle < x[3]) {\n            y = '.3em'\n            tx = -offset\n            ty = 0\n            textAnchor = 'end'\n        } else {\n            y = '.6em'\n            tx = 0\n            ty = offset\n            if (autoOrient) {\n                orientAngle = 90\n                textAnchor = 'start'\n            } else {\n                textAnchor = 'middle'\n            }\n        }\n\n        const {round} = Math\n        return labelAttributes({\n            x: round(tx),\n            y: round(ty),\n            angle: orientAngle,\n            attrs: {\n                '.': {\n                    y: y,\n                    'text-anchor': textAnchor\n                }\n            }\n        })\n    }\n\n    function getBBoxAngles(elBBox) {\n\n        const center = elBBox.center()\n\n        const tl = center.theta(elBBox.origin())\n        const bl = center.theta(elBBox.bottomLeft())\n        const br = center.theta(elBBox.corner())\n        const tr = center.theta(elBBox.topRight())\n\n        return [tl, tr, br, bl]\n    }\n\n    function insideLayout(portPosition, elBBox, autoOrient, opt) {\n\n        const angle = elBBox.center().theta(portPosition)\n        opt = util.defaults({}, opt, { offset: 15 })\n\n        let tx; let ty; let y; let textAnchor\n        const {offset} = opt\n        let orientAngle = 0\n\n        const bBoxAngles = getBBoxAngles(elBBox)\n\n        if (angle < bBoxAngles[1] || angle > bBoxAngles[2]) {\n            y = '.3em'\n            tx = -offset\n            ty = 0\n            textAnchor = 'end'\n        } else if (angle < bBoxAngles[0]) {\n            y = '.6em'\n            tx = 0\n            ty = offset\n            if (autoOrient) {\n                orientAngle = 90\n                textAnchor = 'start'\n            } else {\n                textAnchor = 'middle'\n            }\n        } else if (angle < bBoxAngles[3]) {\n            y = '.3em'\n            tx = offset\n            ty = 0\n            textAnchor = 'start'\n        } else {\n            y = '0em'\n            tx = 0\n            ty = -offset\n            if (autoOrient) {\n                orientAngle = -90\n                textAnchor = 'start'\n            } else {\n                textAnchor = 'middle'\n            }\n        }\n\n        const {round} = Math\n        return labelAttributes({\n            x: round(tx),\n            y: round(ty),\n            angle: orientAngle,\n            attrs: {\n                '.': {\n                    y: y,\n                    'text-anchor': textAnchor\n                }\n            }\n        })\n    }\n\n    function radialLayout(portCenterOffset, autoOrient, opt) {\n\n        opt = util.defaults({}, opt, { offset: 20 })\n\n        const origin = g.point(0, 0)\n        const angle = -portCenterOffset.theta(origin)\n        let orientAngle = angle\n        const offset = portCenterOffset.clone()\n            .move(origin, opt.offset)\n            .difference(portCenterOffset)\n            .round()\n\n        let y = '.3em'\n        let textAnchor\n\n        if ((angle + 90) % 180 === 0) {\n            textAnchor = autoOrient ? 'end' : 'middle'\n            if (!autoOrient && angle === -270) {\n                y = '0em'\n            }\n        } else if (angle > -270 && angle < -90) {\n            textAnchor = 'start'\n            orientAngle = angle - 180\n        } else {\n            textAnchor = 'end'\n        }\n\n        const {round} = Math\n        return labelAttributes({\n            x: round(offset.x),\n            y: round(offset.y),\n            angle: autoOrient ? orientAngle : 0,\n            attrs: {\n                '.': {\n                    y: y,\n                    'text-anchor': textAnchor\n                }\n            }\n        })\n    }\n\n    joint.layout.PortLabel = {\n\n        manual: function(portPosition, elBBox, opt) {\n            return labelAttributes(opt, elBBox)\n        },\n\n        left: function(portPosition, elBBox, opt) {\n            return labelAttributes(opt, { x: -15, attrs: { '.': { y: '.3em', 'text-anchor': 'end' }}})\n        },\n\n        right: function(portPosition, elBBox, opt) {\n            return labelAttributes(opt, { x: 15, attrs: { '.': { y: '.3em', 'text-anchor': 'start' }}})\n        },\n\n        top: function(portPosition, elBBox, opt) {\n            return labelAttributes(opt, { y: -15, attrs: { '.': { 'text-anchor': 'middle' }}})\n        },\n\n        bottom: function(portPosition, elBBox, opt) {\n            return labelAttributes(opt, { y: 15, attrs: { '.': { y: '.6em', 'text-anchor': 'middle' }}})\n        },\n\n        outsideOriented: function(portPosition, elBBox, opt) {\n            return outsideLayout(portPosition, elBBox, true, opt)\n        },\n\n        outside: function(portPosition, elBBox, opt) {\n            return outsideLayout(portPosition, elBBox, false, opt)\n        },\n\n        insideOriented: function(portPosition, elBBox, opt) {\n            return insideLayout(portPosition, elBBox, true, opt)\n        },\n\n        inside: function(portPosition, elBBox, opt) {\n            return insideLayout(portPosition, elBBox, false, opt)\n        },\n\n        radial: function(portPosition, elBBox, opt) {\n            return radialLayout(portPosition.difference(elBBox.center()), false, opt)\n        },\n\n        radialOriented: function(portPosition, elBBox, opt) {\n            return radialLayout(portPosition.difference(elBBox.center()), true, opt)\n        }\n    }\n\n})(g, joint, joint.util)\n\njoint.highlighters.addClass = {\n\n    className: joint.util.addClassNamePrefix('highlighted'),\n\n    /**\n     * @param {joint.dia.CellView} cellView\n     * @param {Element} magnetEl\n     * @param {object=} opt\n     */\n    highlight: function(cellView, magnetEl, opt) {\n\n        const options = opt || {}\n        const className = options.className || this.className\n        V(magnetEl).addClass(className)\n    },\n\n    /**\n     * @param {joint.dia.CellView} cellView\n     * @param {Element} magnetEl\n     * @param {object=} opt\n     */\n    unhighlight: function(cellView, magnetEl, opt) {\n\n        const options = opt || {}\n        const className = options.className || this.className\n        V(magnetEl).removeClass(className)\n    }\n}\n\njoint.highlighters.opacity = {\n\n    /**\n     * @param {joint.dia.CellView} cellView\n     * @param {Element} magnetEl\n     */\n    highlight: function(cellView, magnetEl) {\n\n        V(magnetEl).addClass(joint.util.addClassNamePrefix('highlight-opacity'))\n    },\n\n    /**\n     * @param {joint.dia.CellView} cellView\n     * @param {Element} magnetEl\n     */\n    unhighlight: function(cellView, magnetEl) {\n\n        V(magnetEl).removeClass(joint.util.addClassNamePrefix('highlight-opacity'))\n    }\n}\n\njoint.highlighters.stroke = {\n\n    defaultOptions: {\n        padding: 3,\n        rx: 0,\n        ry: 0,\n        attrs: {\n            'stroke-width': 3,\n            stroke: '#FEB663'\n        }\n    },\n\n    _views: {},\n\n    getHighlighterId: function(magnetEl, opt) {\n\n        return magnetEl.id + JSON.stringify(opt)\n    },\n\n    removeHighlighter: function(id) {\n        if (this._views[id]) {\n            this._views[id].remove()\n            this._views[id] = null\n        }\n    },\n\n    /**\n     * @param {joint.dia.CellView} cellView\n     * @param {Element} magnetEl\n     * @param {object=} opt\n     */\n    highlight: function(cellView, magnetEl, opt) {\n\n        const id = this.getHighlighterId(magnetEl, opt)\n\n        // Only highlight once.\n        if (this._views[id]) return\n\n        const options = joint.util.defaults(opt || {}, this.defaultOptions)\n\n        const magnetVel = V(magnetEl)\n        let magnetBBox\n\n        try {\n\n            var pathData = magnetVel.convertToPathData()\n\n        } catch (error) {\n\n            // Failed to get path data from magnet element.\n            // Draw a rectangle around the entire cell view instead.\n            magnetBBox = magnetVel.bbox(true/* without transforms */)\n            pathData = V.rectToPath(joint.util.assign({}, options, magnetBBox))\n        }\n\n        const highlightVel = V('path').attr({\n            d: pathData,\n            'pointer-events': 'none',\n            'vector-effect': 'non-scaling-stroke',\n            fill: 'none'\n        }).attr(options.attrs)\n\n        let highlightMatrix = magnetVel.getTransformToElement(cellView.el)\n\n        // Add padding to the highlight element.\n        const {padding} = options\n        if (padding) {\n\n            magnetBBox || (magnetBBox = magnetVel.bbox(true))\n\n            const cx = magnetBBox.x + (magnetBBox.width / 2)\n            const cy = magnetBBox.y + (magnetBBox.height / 2)\n\n            magnetBBox = V.transformRect(magnetBBox, highlightMatrix)\n\n            const width = Math.max(magnetBBox.width, 1)\n            const height = Math.max(magnetBBox.height, 1)\n            const sx = (width + padding) / width\n            const sy = (height + padding) / height\n\n            const paddingMatrix = V.createSVGMatrix({\n                a: sx,\n                b: 0,\n                c: 0,\n                d: sy,\n                e: cx - sx * cx,\n                f: cy - sy * cy\n            })\n\n            highlightMatrix = highlightMatrix.multiply(paddingMatrix)\n        }\n\n        highlightVel.transform(highlightMatrix)\n\n        // joint.mvc.View will handle the theme class name and joint class name prefix.\n        const highlightView = this._views[id] = new joint.mvc.View({\n            svgElement: true,\n            className: 'highlight-stroke',\n            el: highlightVel.node\n        })\n\n        // Remove the highlight view when the cell is removed from the graph.\n        const removeHandler = this.removeHighlighter.bind(this, id)\n        const cell = cellView.model\n        highlightView.listenTo(cell, 'remove', removeHandler)\n        highlightView.listenTo(cell.graph, 'reset', removeHandler)\n\n        cellView.vel.append(highlightVel)\n    },\n\n    /**\n     * @param {joint.dia.CellView} cellView\n     * @param {Element} magnetEl\n     * @param {object=} opt\n     */\n    unhighlight: function(cellView, magnetEl, opt) {\n\n        this.removeHighlighter(this.getHighlighterId(magnetEl, opt))\n    }\n};\n\n(function(joint, util) {\n\n    function bboxWrapper(method) {\n\n        return function(view, magnet, ref, opt) {\n\n            const rotate = !!opt.rotate\n            const bbox = (rotate) ? view.getNodeUnrotatedBBox(magnet) : view.getNodeBBox(magnet)\n            const anchor = bbox[method]()\n\n            let {dx} = opt\n            if (dx) {\n                const dxPercentage = util.isPercentage(dx)\n                dx = parseFloat(dx)\n                if (isFinite(dx)) {\n                    if (dxPercentage) {\n                        dx /= 100\n                        dx *= bbox.width\n                    }\n                    anchor.x += dx\n                }\n            }\n\n            let {dy} = opt\n            if (dy) {\n                const dyPercentage = util.isPercentage(dy)\n                dy = parseFloat(dy)\n                if (isFinite(dy)) {\n                    if (dyPercentage) {\n                        dy /= 100\n                        dy *= bbox.height\n                    }\n                    anchor.y += dy\n                }\n            }\n\n            return (rotate) ? anchor.rotate(view.model.getBBox().center(), -view.model.angle()) : anchor\n        }\n    }\n\n    function resolveRefAsBBoxCenter(fn) {\n\n        return function(view, magnet, ref, opt) {\n\n            if (ref instanceof Element) {\n                const refView = this.paper.findView(ref)\n                const refPoint = (refView)\n                    ? refView.getNodeBBox(ref).center()\n                    : new g.Point()\n\n                return fn.call(this, view, magnet, refPoint, opt)\n            }\n\n            return fn.apply(this, arguments)\n        }\n    }\n\n    function perpendicular(view, magnet, refPoint, opt) {\n\n        const angle = view.model.angle()\n        const bbox = view.getNodeBBox(magnet)\n        const anchor = bbox.center()\n        const topLeft = bbox.origin()\n        const bottomRight = bbox.corner()\n\n        let {padding} = opt\n        if (!isFinite(padding)) padding = 0\n\n        if ((topLeft.y + padding) <= refPoint.y && refPoint.y <= (bottomRight.y - padding)) {\n            const dy = (refPoint.y - anchor.y)\n            anchor.x += (angle === 0 || angle === 180) ? 0 : dy * 1 / Math.tan(g.toRad(angle))\n            anchor.y += dy\n        } else if ((topLeft.x + padding) <= refPoint.x && refPoint.x <= (bottomRight.x - padding)) {\n            const dx = (refPoint.x - anchor.x)\n            anchor.y += (angle === 90 || angle === 270) ? 0 : dx * Math.tan(g.toRad(angle))\n            anchor.x += dx\n        }\n\n        return anchor\n    }\n\n    function midSide(view, magnet, refPoint, opt) {\n\n        const rotate = !!opt.rotate\n        let bbox; let angle; let center\n        if (rotate) {\n            bbox = view.getNodeUnrotatedBBox(magnet)\n            center = view.model.getBBox().center()\n            angle = view.model.angle()\n        } else {\n            bbox = view.getNodeBBox(magnet)\n        }\n\n        const {padding} = opt\n        if (isFinite(padding)) bbox.inflate(padding)\n\n        if (rotate) refPoint.rotate(center, angle)\n\n        const side = bbox.sideNearestToPoint(refPoint)\n        let anchor\n        switch (side) {\n            case 'left': anchor = bbox.leftMiddle(); break\n            case 'right': anchor = bbox.rightMiddle(); break\n            case 'top': anchor = bbox.topMiddle(); break\n            case 'bottom': anchor = bbox.bottomMiddle(); break\n        }\n\n        return (rotate) ? anchor.rotate(center, -angle) : anchor\n    }\n\n    // Can find anchor from model, when there is no selector or the link end\n    // is connected to a port\n    function modelCenter(view, magnet) {\n\n        const {model} = view\n        const bbox = model.getBBox()\n        const center = bbox.center()\n        const angle = model.angle()\n\n        const portId = view.findAttribute('port', magnet)\n        if (portId) {\n            const portGroup = model.portProp(portId, 'group')\n            const portsPositions = model.getPortsPositions(portGroup)\n            const anchor = new g.Point(portsPositions[portId]).offset(bbox.origin())\n            anchor.rotate(center, -angle)\n            return anchor\n        }\n\n        return center\n    }\n\n    joint.anchors = {\n        center: bboxWrapper('center'),\n        top: bboxWrapper('topMiddle'),\n        bottom: bboxWrapper('bottomMiddle'),\n        left: bboxWrapper('leftMiddle'),\n        right: bboxWrapper('rightMiddle'),\n        topLeft: bboxWrapper('origin'),\n        topRight: bboxWrapper('topRight'),\n        bottomLeft: bboxWrapper('bottomLeft'),\n        bottomRight: bboxWrapper('corner'),\n        perpendicular: resolveRefAsBBoxCenter(perpendicular),\n        midSide: resolveRefAsBBoxCenter(midSide),\n        modelCenter: modelCenter\n    }\n\n})(joint, joint.util);\n\n(function(joint, util, g, V) {\n\n    function closestIntersection(intersections, refPoint) {\n\n        if (intersections.length === 1) return intersections[0]\n        return util.sortBy(intersections, function(i) { return i.squaredDistance(refPoint) })[0]\n    }\n\n    function offset(p1, p2, offset) {\n\n        if (!isFinite(offset)) return p1\n        const length = p1.distance(p2)\n        if (offset === 0 && length > 0) return p1\n        return p1.move(p2, -Math.min(offset, length - 1))\n    }\n\n    function stroke(magnet) {\n\n        const stroke = magnet.getAttribute('stroke-width')\n        if (stroke === null) return 0\n        return parseFloat(stroke) || 0\n    }\n\n    // Connection Points\n\n    function anchor(line, view, magnet, opt) {\n\n        return offset(line.end, line.start, opt.offset)\n    }\n\n    function bboxIntersection(line, view, magnet, opt) {\n\n        const bbox = view.getNodeBBox(magnet)\n        if (opt.stroke) bbox.inflate(stroke(magnet) / 2)\n        const intersections = line.intersect(bbox)\n        const cp = (intersections)\n            ? closestIntersection(intersections, line.start)\n            : line.end\n        return offset(cp, line.start, opt.offset)\n    }\n\n    function rectangleIntersection(line, view, magnet, opt) {\n\n        const angle = view.model.angle()\n        if (angle === 0) {\n            return bboxIntersection(line, view, magnet, opt)\n        }\n\n        const bboxWORotation = view.getNodeUnrotatedBBox(magnet)\n        if (opt.stroke) bboxWORotation.inflate(stroke(magnet) / 2)\n        const center = bboxWORotation.center()\n        const lineWORotation = line.clone().rotate(center, angle)\n        const intersections = lineWORotation.setLength(1e6).intersect(bboxWORotation)\n        const cp = (intersections)\n            ? closestIntersection(intersections, lineWORotation.start).rotate(center, -angle)\n            : line.end\n        return offset(cp, line.start, opt.offset)\n    }\n\n    const BNDR_SUBDIVISIONS = 'segmentSubdivisons'\n    const BNDR_SHAPE_BBOX = 'shapeBBox'\n\n    function boundaryIntersection(line, view, magnet, opt) {\n\n        let node; let intersection\n        const {selector} = opt\n        const anchor = line.end\n\n        if (typeof selector === 'string') {\n            node = view.findBySelector(selector)[0]\n        } else if (Array.isArray(selector)) {\n            node = util.getByPath(magnet, selector)\n        } else {\n            // Find the closest non-group descendant\n            node = magnet\n            do {\n                const tagName = node.tagName.toUpperCase()\n                if (tagName === 'G') {\n                    node = node.firstChild\n                } else if (tagName === 'TITLE') {\n                    node = node.nextSibling\n                } else break\n            } while (node)\n        }\n\n        if (!(node instanceof Element)) return anchor\n\n        const localShape = view.getNodeShape(node)\n        const magnetMatrix = view.getNodeMatrix(node)\n        const translateMatrix = view.getRootTranslateMatrix()\n        const rotateMatrix = view.getRootRotateMatrix()\n        const targetMatrix = translateMatrix.multiply(rotateMatrix).multiply(magnetMatrix)\n        const localMatrix = targetMatrix.inverse()\n        const localLine = V.transformLine(line, localMatrix)\n        const localRef = localLine.start.clone()\n        const data = view.getNodeData(node)\n\n        if (opt.insideout === false) {\n            if (!data[BNDR_SHAPE_BBOX]) data[BNDR_SHAPE_BBOX] = localShape.bbox()\n            const localBBox = data[BNDR_SHAPE_BBOX]\n            if (localBBox.containsPoint(localRef)) return anchor\n        }\n\n        // Caching segment subdivisions for paths\n        let pathOpt\n        if (localShape instanceof g.Path) {\n            const precision = opt.precision || 2\n            if (!data[BNDR_SUBDIVISIONS]) data[BNDR_SUBDIVISIONS] = localShape.getSegmentSubdivisions({ precision: precision })\n            pathOpt = {\n                precision: precision,\n                segmentSubdivisions: data[BNDR_SUBDIVISIONS]\n            }\n        }\n\n        if (opt.extrapolate === true) localLine.setLength(1e6)\n\n        intersection = localLine.intersect(localShape, pathOpt)\n        if (intersection) {\n            // More than one intersection\n            if (V.isArray(intersection)) intersection = closestIntersection(intersection, localRef)\n        } else if (opt.sticky === true) {\n            // No intersection, find the closest point instead\n            if (localShape instanceof g.Rect) {\n                intersection = localShape.pointNearestToPoint(localRef)\n            } else if (localShape instanceof g.Ellipse) {\n                intersection = localShape.intersectionWithLineFromCenterToPoint(localRef)\n            } else {\n                intersection = localShape.closestPoint(localRef, pathOpt)\n            }\n        }\n\n        const cp = (intersection) ? V.transformPoint(intersection, targetMatrix) : anchor\n        let cpOffset = opt.offset || 0\n        if (opt.stroke) cpOffset += stroke(node) / 2\n\n        return offset(cp, line.start, cpOffset)\n    }\n\n    joint.connectionPoints = {\n        anchor: anchor,\n        bbox: bboxIntersection,\n        rectangle: rectangleIntersection,\n        boundary: boundaryIntersection\n    }\n\n})(joint, joint.util, g, V);\n\n(function(joint, util) {\n\n    function abs2rel(value, max) {\n\n        if (max === 0) return '0%'\n        return `${Math.round(value / max * 100)  }%`\n    }\n\n    function pin(relative) {\n\n        return function(end, view, magnet, coords) {\n\n            const angle = view.model.angle()\n            const bbox = view.getNodeUnrotatedBBox(magnet)\n            const origin = view.model.getBBox().center()\n            coords.rotate(origin, angle)\n            let dx = coords.x - bbox.x\n            let dy = coords.y - bbox.y\n\n            if (relative) {\n                dx = abs2rel(dx, bbox.width)\n                dy = abs2rel(dy, bbox.height)\n            }\n\n            end.anchor = {\n                name: 'topLeft',\n                args: {\n                    dx: dx,\n                    dy: dy,\n                    rotate: true\n                }\n            }\n\n            return end\n        }\n    }\n\n    joint.connectionStrategies = {\n        useDefaults: util.noop,\n        pinAbsolute: pin(false),\n        pinRelative: pin(true)\n    }\n\n})(joint, joint.util);\n\n(function(joint, util, V, g) {\n\n    function getAnchor(coords, view, magnet) {\n        // take advantage of an existing logic inside of the\n        // pin relative connection strategy\n        const end = joint.connectionStrategies.pinRelative.call(\n            this.paper,\n            {},\n            view,\n            magnet,\n            coords,\n            this.model\n        )\n        return end.anchor\n    }\n\n    function snapAnchor(coords, view, magnet, type, relatedView, toolView) {\n        const {snapRadius} = toolView.options\n        const isSource = (type === 'source')\n        const refIndex = (isSource ? 0 : -1)\n        const ref = this.model.vertex(refIndex) || this.getEndAnchor(isSource ? 'target' : 'source')\n        if (ref) {\n            if (Math.abs(ref.x - coords.x) < snapRadius) coords.x = ref.x\n            if (Math.abs(ref.y - coords.y) < snapRadius) coords.y = ref.y\n        }\n        return coords\n    }\n\n    const {ToolView} = joint.dia\n\n    // Vertex Handles\n    const VertexHandle = joint.mvc.View.extend({\n        tagName: 'circle',\n        svgElement: true,\n        className: 'marker-vertex',\n        events: {\n            mousedown: 'onPointerDown',\n            touchstart: 'onPointerDown',\n            dblclick: 'onDoubleClick'\n        },\n        documentEvents: {\n            mousemove: 'onPointerMove',\n            touchmove: 'onPointerMove',\n            mouseup: 'onPointerUp',\n            touchend: 'onPointerUp'\n        },\n        attributes: {\n            r: 6,\n            fill: '#33334F',\n            stroke: '#FFFFFF',\n            'stroke-width': 2,\n            cursor: 'move'\n        },\n        position: function(x, y) {\n            this.vel.attr({ cx: x, cy: y })\n        },\n        onPointerDown: function(evt) {\n            evt.stopPropagation()\n            this.options.paper.undelegateEvents()\n            this.delegateDocumentEvents(null, evt.data)\n            this.trigger('will-change')\n        },\n        onPointerMove: function(evt) {\n            this.trigger('changing', this, evt)\n        },\n        onDoubleClick: function(evt) {\n            this.trigger('remove', this, evt)\n        },\n        onPointerUp: function(evt) {\n            this.trigger('changed', this, evt)\n            this.undelegateDocumentEvents()\n            this.options.paper.delegateEvents()\n        }\n    })\n\n    const Vertices = ToolView.extend({\n        name: 'vertices',\n        options: {\n            handleClass: VertexHandle,\n            snapRadius: 20,\n            redundancyRemoval: true,\n            vertexAdding: true,\n        },\n        children: [{\n            tagName: 'path',\n            selector: 'connection',\n            className: 'joint-vertices-path',\n            attributes: {\n                fill: 'none',\n                stroke: 'transparent',\n                'stroke-width': 10,\n                cursor: 'cell'\n            }\n        }],\n        handles: null,\n        events: {\n            'mousedown .joint-vertices-path': 'onPathPointerDown'\n        },\n        onRender: function() {\n            this.resetHandles()\n            if (this.options.vertexAdding) {\n                this.renderChildren()\n                this.updatePath()\n            }\n            const {relatedView} = this\n            const vertices = relatedView.model.vertices()\n            for (let i = 0, n = vertices.length; i < n; i++) {\n                const vertex = vertices[i]\n                const handle = new (this.options.handleClass)({ index: i, paper: this.paper })\n                handle.render()\n                handle.position(vertex.x, vertex.y)\n                this.simulateRelatedView(handle.el)\n                handle.vel.appendTo(this.el)\n                this.handles.push(handle)\n                this.startHandleListening(handle)\n            }\n            return this\n        },\n        update: function() {\n            this.render()\n            return this\n        },\n        updatePath: function() {\n            const {connection} = this.childNodes\n            if (connection) connection.setAttribute('d', this.relatedView.getConnection().serialize())\n        },\n        startHandleListening: function(handle) {\n            const {relatedView} = this\n            if (relatedView.can('vertexMove')) {\n                this.listenTo(handle, 'will-change', this.onHandleWillChange)\n                this.listenTo(handle, 'changing', this.onHandleChanging)\n                this.listenTo(handle, 'changed', this.onHandleChanged)\n            }\n            if (relatedView.can('vertexRemove')) {\n                this.listenTo(handle, 'remove', this.onHandleRemove)\n            }\n        },\n        resetHandles: function() {\n            const {handles} = this\n            this.handles = []\n            this.stopListening()\n            if (!Array.isArray(handles)) return\n            for (let i = 0, n = handles.length; i < n; i++) {\n                handles[i].remove()\n            }\n        },\n        getNeighborPoints: function(index) {\n            const linkView = this.relatedView\n            const vertices = linkView.model.vertices()\n            const prev = (index > 0) ? vertices[index - 1] : linkView.sourceAnchor\n            const next = (index < vertices.length - 1) ? vertices[index + 1] : linkView.targetAnchor\n            return {\n                prev: new g.Point(prev),\n                next: new g.Point(next)\n            }\n        },\n        onHandleWillChange: function(handle, evt) {\n            this.focus()\n            this.relatedView.model.startBatch('vertex-move', { ui: true, tool: this.cid })\n        },\n        onHandleChanging: function(handle, evt) {\n            const {relatedView} = this\n            const {paper} = relatedView\n            const {index} = handle.options\n            const vertex = paper.snapToGrid(evt.clientX, evt.clientY).toJSON()\n            this.snapVertex(vertex, index)\n            relatedView.model.vertex(index, vertex, { ui: true, tool: this.cid })\n            handle.position(vertex.x, vertex.y)\n        },\n        snapVertex: function(vertex, index) {\n            const {snapRadius} = this.options\n            if (snapRadius > 0) {\n                const neighbors = this.getNeighborPoints(index)\n                const {prev} = neighbors\n                const {next} = neighbors\n                if (Math.abs(vertex.x - prev.x) < snapRadius) {\n                    vertex.x = prev.x\n                } else if (Math.abs(vertex.x - next.x) < snapRadius) {\n                    vertex.x = next.x\n                }\n                if (Math.abs(vertex.y - prev.y) < snapRadius) {\n                    vertex.y = neighbors.prev.y\n                } else if (Math.abs(vertex.y - next.y) < snapRadius) {\n                    vertex.y = next.y\n                }\n            }\n        },\n        onHandleChanged: function(handle, evt) {\n            if (this.options.vertexAdding) this.updatePath()\n            if (!this.options.redundancyRemoval) return\n            const linkView = this.relatedView\n            const verticesRemoved = linkView.removeRedundantLinearVertices({ ui: true, tool: this.cid })\n            if (verticesRemoved) this.render()\n            this.blur()\n            linkView.model.stopBatch('vertex-move', { ui: true, tool: this.cid })\n            if (this.eventData(evt).vertexAdded) {\n                linkView.model.stopBatch('vertex-add', { ui: true, tool: this.cid })\n            }\n        },\n        onHandleRemove: function(handle) {\n            const {index} = handle.options\n            this.relatedView.model.removeVertex(index, { ui: true })\n        },\n        onPathPointerDown: function(evt) {\n            evt.stopPropagation()\n            const vertex = this.paper.snapToGrid(evt.clientX, evt.clientY).toJSON()\n            const {relatedView} = this\n            relatedView.model.startBatch('vertex-add', { ui: true, tool: this.cid })\n            const index = relatedView.getVertexIndex(vertex.x, vertex.y)\n            this.snapVertex(vertex, index)\n            relatedView.model.insertVertex(index, vertex, { ui: true, tool: this.cid })\n            this.render()\n            const handle = this.handles[index]\n            this.eventData(evt, { vertexAdded: true })\n            handle.onPointerDown(evt)\n        },\n        onRemove: function() {\n            this.resetHandles()\n        }\n    }, {\n        VertexHandle: VertexHandle // keep as class property\n    })\n\n    const SegmentHandle = joint.mvc.View.extend({\n        tagName: 'g',\n        svgElement: true,\n        className: 'marker-segment',\n        events: {\n            mousedown: 'onPointerDown',\n            touchstart: 'onPointerDown'\n        },\n        documentEvents: {\n            mousemove: 'onPointerMove',\n            touchmove: 'onPointerMove',\n            mouseup: 'onPointerUp',\n            touchend: 'onPointerUp'\n        },\n        children: [{\n            tagName: 'line',\n            selector: 'line',\n            attributes: {\n                stroke: '#33334F',\n                'stroke-width': 2,\n                fill: 'none',\n                'pointer-events': 'none'\n            }\n        }, {\n            tagName: 'rect',\n            selector: 'handle',\n            attributes: {\n                width: 20,\n                height: 8,\n                x: -10,\n                y: -4,\n                rx: 4,\n                ry: 4,\n                fill: '#33334F',\n                stroke: '#FFFFFF',\n                'stroke-width': 2\n            }\n        }],\n        onRender: function() {\n            this.renderChildren()\n        },\n        position: function(x, y, angle, view) {\n\n            const matrix = V.createSVGMatrix().translate(x, y).rotate(angle)\n            const {handle} = this.childNodes\n            handle.setAttribute('transform', V.matrixToTransformString(matrix))\n            handle.setAttribute('cursor', (angle % 180 === 0) ? 'row-resize' : 'col-resize')\n\n            const viewPoint = view.getClosestPoint(new g.Point(x, y))\n            const {line} = this.childNodes\n            line.setAttribute('x1', x)\n            line.setAttribute('y1', y)\n            line.setAttribute('x2', viewPoint.x)\n            line.setAttribute('y2', viewPoint.y)\n        },\n        onPointerDown: function(evt) {\n            this.trigger('change:start', this, evt)\n            evt.stopPropagation()\n            this.options.paper.undelegateEvents()\n            this.delegateDocumentEvents(null, evt.data)\n        },\n        onPointerMove: function(evt) {\n            this.trigger('changing', this, evt)\n        },\n        onPointerUp: function(evt) {\n            this.undelegateDocumentEvents()\n            this.options.paper.delegateEvents()\n            this.trigger('change:end', this, evt)\n        },\n        show: function() {\n            this.el.style.display = ''\n        },\n        hide: function() {\n            this.el.style.display = 'none'\n        }\n    })\n\n    const Segments = ToolView.extend({\n        name: 'segments',\n        precision: .5,\n        options: {\n            handleClass: SegmentHandle,\n            segmentLengthThreshold: 40,\n            redundancyRemoval: true,\n            anchor: getAnchor,\n            snapRadius: 10,\n            snapHandle: true\n        },\n        handles: null,\n        onRender: function() {\n            this.resetHandles()\n            const {relatedView} = this\n            const vertices = relatedView.model.vertices()\n            vertices.unshift(relatedView.sourcePoint)\n            vertices.push(relatedView.targetPoint)\n            for (let i = 0, n = vertices.length; i < n - 1; i++) {\n                const vertex = vertices[i]\n                const nextVertex = vertices[i + 1]\n                const handle = this.renderHandle(vertex, nextVertex)\n                this.simulateRelatedView(handle.el)\n                this.handles.push(handle)\n                handle.options.index = i\n            }\n            return this\n        },\n        renderHandle: function(vertex, nextVertex) {\n            const handle = new (this.options.handleClass)({ paper: this.paper })\n            handle.render()\n            this.updateHandle(handle, vertex, nextVertex)\n            handle.vel.appendTo(this.el)\n            this.startHandleListening(handle)\n            return handle\n        },\n        update: function() {\n            this.render()\n            return this\n        },\n        startHandleListening: function(handle) {\n            this.listenTo(handle, 'change:start', this.onHandleChangeStart)\n            this.listenTo(handle, 'changing', this.onHandleChanging)\n            this.listenTo(handle, 'change:end', this.onHandleChangeEnd)\n        },\n        resetHandles: function() {\n            const {handles} = this\n            this.handles = []\n            this.stopListening()\n            if (!Array.isArray(handles)) return\n            for (let i = 0, n = handles.length; i < n; i++) {\n                handles[i].remove()\n            }\n        },\n        shiftHandleIndexes: function(value) {\n            const {handles} = this\n            for (let i = 0, n = handles.length; i < n; i++) handles[i].options.index += value\n        },\n        resetAnchor: function(type, anchor) {\n            const relatedModel = this.relatedView.model\n            if (anchor) {\n                relatedModel.prop([type, 'anchor'], anchor, {\n                    rewrite: true,\n                    ui: true,\n                    tool: this.cid\n                })\n            } else {\n                relatedModel.removeProp([type, 'anchor'], {\n                    ui: true,\n                    tool: this.cid\n                })\n            }\n        },\n        snapHandle: function(handle, position, data) {\n\n            const {index} = handle.options\n            const linkView = this.relatedView\n            const link = linkView.model\n            const vertices = link.vertices()\n            const {axis} = handle.options\n            const prev = vertices[index - 2] || data.sourceAnchor\n            const next = vertices[index + 1] || data.targetAnchor\n            const {snapRadius} = this.options\n            if (Math.abs(position[axis] - prev[axis]) < snapRadius) {\n                position[axis] = prev[axis]\n            } else if (Math.abs(position[axis] - next[axis]) < snapRadius) {\n                position[axis] = next[axis]\n            }\n            return position\n        },\n\n        onHandleChanging: function(handle, evt) {\n\n            const data = this.eventData(evt)\n            const {relatedView} = this\n            const {paper} = relatedView\n            const index = handle.options.index - 1\n            const coords = paper.snapToGrid(evt.clientX, evt.clientY)\n            const position = this.snapHandle(handle, coords.clone(), data)\n            const {axis} = handle.options\n            const offset = (this.options.snapHandle) ? 0 : (coords[axis] - position[axis])\n            const link = relatedView.model\n            const vertices = util.cloneDeep(link.vertices())\n            let vertex = vertices[index]\n            let nextVertex = vertices[index + 1]\n            let anchorFn = this.options.anchor\n            if (typeof anchorFn !== 'function') anchorFn = null\n\n            // First Segment\n            const {sourceView} = relatedView\n            const {sourceBBox} = relatedView\n            let changeSourceAnchor = false\n            let deleteSourceAnchor = false\n            if (!vertex) {\n                vertex = relatedView.sourceAnchor.toJSON()\n                vertex[axis] = position[axis]\n                if (sourceBBox.containsPoint(vertex)) {\n                    vertex[axis] = position[axis]\n                    changeSourceAnchor = true\n                } else {\n                    // we left the area of the source magnet for the first time\n                    vertices.unshift(vertex)\n                    this.shiftHandleIndexes(1)\n                    deleteSourceAnchor = true\n                }\n            } else if (index === 0) {\n                if (sourceBBox.containsPoint(vertex)) {\n                    vertices.shift()\n                    this.shiftHandleIndexes(-1)\n                    changeSourceAnchor = true\n                } else {\n                    vertex[axis] = position[axis]\n                    deleteSourceAnchor = true\n                }\n            } else {\n                vertex[axis] = position[axis]\n            }\n\n            if (anchorFn && sourceView) {\n                if (changeSourceAnchor) {\n                    const sourceAnchorPosition = data.sourceAnchor.clone()\n                    sourceAnchorPosition[axis] = position[axis]\n                    const sourceAnchor = anchorFn.call(relatedView, sourceAnchorPosition, sourceView, relatedView.sourceMagnet || sourceView.el, 'source', relatedView)\n                    this.resetAnchor('source', sourceAnchor)\n                }\n                if (deleteSourceAnchor) {\n                    this.resetAnchor('source', data.sourceAnchorDef)\n                }\n            }\n\n            // Last segment\n            const {targetView} = relatedView\n            const {targetBBox} = relatedView\n            let changeTargetAnchor = false\n            let deleteTargetAnchor = false\n            if (!nextVertex) {\n                nextVertex = relatedView.targetAnchor.toJSON()\n                nextVertex[axis] = position[axis]\n                if (targetBBox.containsPoint(nextVertex)) {\n                    changeTargetAnchor = true\n                } else {\n                    // we left the area of the target magnet for the first time\n                    vertices.push(nextVertex)\n                    deleteTargetAnchor = true\n                }\n            } else if (index === vertices.length - 2) {\n                if (targetBBox.containsPoint(nextVertex)) {\n                    vertices.pop()\n                    changeTargetAnchor = true\n                } else {\n                    nextVertex[axis] = position[axis]\n                    deleteTargetAnchor = true\n                }\n            } else {\n                nextVertex[axis] = position[axis]\n            }\n\n            if (anchorFn && targetView) {\n                if (changeTargetAnchor) {\n                    const targetAnchorPosition = data.targetAnchor.clone()\n                    targetAnchorPosition[axis] = position[axis]\n                    const targetAnchor = anchorFn.call(relatedView, targetAnchorPosition, targetView, relatedView.targetMagnet || targetView.el, 'target', relatedView)\n                    this.resetAnchor('target', targetAnchor)\n                }\n                if (deleteTargetAnchor) {\n                    this.resetAnchor('target', data.targetAnchorDef)\n                }\n            }\n\n            link.vertices(vertices, { ui: true, tool: this.cid })\n            this.updateHandle(handle, vertex, nextVertex, offset)\n        },\n        onHandleChangeStart: function(handle, evt) {\n            const {index} = handle.options\n            const {handles} = this\n            if (!Array.isArray(handles)) return\n            for (let i = 0, n = handles.length; i < n; i++) {\n                if (i !== index) handles[i].hide()\n            }\n            this.focus()\n            const {relatedView} = this\n            const relatedModel = relatedView.model\n            this.eventData(evt, {\n                sourceAnchor: relatedView.sourceAnchor.clone(),\n                targetAnchor: relatedView.targetAnchor.clone(),\n                sourceAnchorDef: util.clone(relatedModel.prop(['source', 'anchor'])),\n                targetAnchorDef: util.clone(relatedModel.prop(['target', 'anchor']))\n            })\n            relatedView.model.startBatch('segment-move', { ui: true, tool: this.cid })\n        },\n        onHandleChangeEnd: function(handle) {\n            const linkView = this.relatedView\n            if (this.options.redundancyRemoval) {\n                linkView.removeRedundantLinearVertices({ ui: true, tool: this.cid })\n            }\n            this.render()\n            this.blur()\n            linkView.model.stopBatch('segment-move', { ui: true, tool: this.cid })\n        },\n        updateHandle: function(handle, vertex, nextVertex, offset) {\n            const vertical = Math.abs(vertex.x - nextVertex.x) < this.precision\n            const horizontal = Math.abs(vertex.y - nextVertex.y) < this.precision\n            if (vertical || horizontal) {\n                const segmentLine = new g.Line(vertex, nextVertex)\n                const length = segmentLine.length()\n                if (length < this.options.segmentLengthThreshold) {\n                    handle.hide()\n                } else {\n                    const position = segmentLine.midpoint()\n                    const axis = (vertical) ? 'x' : 'y'\n                    position[axis] += offset || 0\n                    const angle = segmentLine.vector().vectorAngle(new g.Point(1, 0))\n                    handle.position(position.x, position.y, angle, this.relatedView)\n                    handle.show()\n                    handle.options.axis = axis\n                }\n            } else {\n                handle.hide()\n            }\n        },\n        onRemove: function() {\n            this.resetHandles()\n        }\n    }, {\n        SegmentHandle: SegmentHandle // keep as class property\n    })\n\n    // End Markers\n    const Arrowhead = ToolView.extend({\n        tagName: 'path',\n        xAxisVector: new g.Point(1, 0),\n        events: {\n            mousedown: 'onPointerDown',\n            touchstart: 'onPointerDown'\n        },\n        documentEvents: {\n            mousemove: 'onPointerMove',\n            touchmove: 'onPointerMove',\n            mouseup: 'onPointerUp',\n            touchend: 'onPointerUp'\n        },\n        onRender: function() {\n            this.update()\n        },\n        update: function() {\n            const {ratio} = this\n            const view = this.relatedView\n            const tangent = view.getTangentAtRatio(ratio)\n            let position; let angle\n            if (tangent) {\n                position = tangent.start\n                angle = tangent.vector().vectorAngle(this.xAxisVector) || 0\n            } else {\n                position = view.getPointAtRatio(ratio)\n                angle = 0\n            }\n            const matrix = V.createSVGMatrix().translate(position.x, position.y).rotate(angle)\n            this.vel.transform(matrix, { absolute: true })\n            return this\n        },\n        onPointerDown: function(evt) {\n            evt.stopPropagation()\n            const {relatedView} = this\n            relatedView.model.startBatch('arrowhead-move', { ui: true, tool: this.cid })\n            if (relatedView.can('arrowheadMove')) {\n                relatedView.startArrowheadMove(this.arrowheadType)\n                this.delegateDocumentEvents()\n                relatedView.paper.undelegateEvents()\n            }\n            this.focus()\n            this.el.style.pointerEvents = 'none'\n        },\n        onPointerMove: function(evt) {\n            const coords = this.paper.snapToGrid(evt.clientX, evt.clientY)\n            this.relatedView.pointermove(evt, coords.x, coords.y)\n        },\n        onPointerUp: function(evt) {\n            this.undelegateDocumentEvents()\n            const {relatedView} = this\n            const {paper} = relatedView\n            const coords = paper.snapToGrid(evt.clientX, evt.clientY)\n            relatedView.pointerup(evt, coords.x, coords.y)\n            paper.delegateEvents()\n            this.blur()\n            this.el.style.pointerEvents = ''\n            relatedView.model.stopBatch('arrowhead-move', { ui: true, tool: this.cid })\n        }\n    })\n\n    const TargetArrowhead = Arrowhead.extend({\n        name: 'target-arrowhead',\n        ratio: 1,\n        arrowheadType: 'target',\n        attributes: {\n            d: 'M -10 -8 10 0 -10 8 Z',\n            fill: '#33334F',\n            stroke: '#FFFFFF',\n            'stroke-width': 2,\n            cursor: 'move',\n            class: 'target-arrowhead'\n        }\n    })\n\n    const SourceArrowhead = Arrowhead.extend({\n        name: 'source-arrowhead',\n        ratio: 0,\n        arrowheadType: 'source',\n        attributes: {\n            d: 'M 10 -8 -10 0 10 8 Z',\n            fill: '#33334F',\n            stroke: '#FFFFFF',\n            'stroke-width': 2,\n            cursor: 'move',\n            class: 'source-arrowhead'\n        }\n    })\n\n    const Button = ToolView.extend({\n        name: 'button',\n        events: {\n            mousedown: 'onPointerDown',\n            touchstart: 'onPointerDown'\n        },\n        options: {\n            distance: 0,\n            offset: 0,\n            rotate: false\n        },\n        onRender: function() {\n            this.renderChildren(this.options.markup)\n            this.update()\n        },\n        update: function() {\n            let tangent; let position; let angle\n            const distance = this.options.distance || 0\n            if (util.isPercentage(distance)) {\n                tangent = this.relatedView.getTangentAtRatio(parseFloat(distance) / 100)\n            } else {\n                tangent = this.relatedView.getTangentAtLength(distance)\n            }\n            if (tangent) {\n                position = tangent.start\n                angle = tangent.vector().vectorAngle(new g.Point(1,0)) || 0\n            } else {\n                position = this.relatedView.getConnection().start\n                angle = 0\n            }\n            let matrix = V.createSVGMatrix()\n                .translate(position.x, position.y)\n                .rotate(angle)\n                .translate(0, this.options.offset || 0)\n            if (!this.options.rotate) matrix = matrix.rotate(-angle)\n            this.vel.transform(matrix, { absolute: true })\n            return this\n        },\n        onPointerDown: function(evt) {\n            evt.stopPropagation()\n            const actionFn = this.options.action\n            if (typeof actionFn === 'function') {\n                actionFn.call(this.relatedView, evt, this.relatedView)\n            }\n        }\n    })\n\n\n    const Remove = Button.extend({\n        children: [{\n            tagName: 'circle',\n            selector: 'button',\n            attributes: {\n                r: 7,\n                fill: '#FF1D00',\n                cursor: 'pointer'\n            }\n        }, {\n            tagName: 'path',\n            selector: 'icon',\n            attributes: {\n                d: 'M -3 -3 3 3 M -3 3 3 -3',\n                fill: 'none',\n                stroke: '#FFFFFF',\n                'stroke-width': 2,\n                'pointer-events': 'none'\n            }\n        }],\n        options: {\n            distance: 60,\n            offset: 0,\n            action: function(evt) {\n                this.model.remove({ ui: true, tool: this.cid })\n            }\n        }\n    })\n\n    const Boundary = ToolView.extend({\n        name: 'boundary',\n        tagName: 'rect',\n        options: {\n            padding: 10\n        },\n        attributes: {\n            fill: 'none',\n            stroke: '#33334F',\n            'stroke-width': .5,\n            'stroke-dasharray': '5, 5',\n            'pointer-events': 'none'\n        },\n        onRender: function() {\n            this.update()\n        },\n        update: function() {\n            let {padding} = this.options\n            if (!isFinite(padding)) padding = 0\n            const bbox = this.relatedView.getConnection().bbox().inflate(padding)\n            this.vel.attr(bbox.toJSON())\n            return this\n        }\n    })\n\n    const Anchor = ToolView.extend({\n        tagName: 'g',\n        type: null,\n        children: [{\n            tagName: 'circle',\n            selector: 'anchor',\n            attributes: {\n                cursor: 'pointer'\n            }\n        }, {\n            tagName: 'rect',\n            selector: 'area',\n            attributes: {\n                'pointer-events': 'none',\n                fill: 'none',\n                stroke: '#33334F',\n                'stroke-dasharray': '2,4',\n                rx: 5,\n                ry: 5\n            }\n        }],\n        events: {\n            mousedown: 'onPointerDown',\n            touchstart: 'onPointerDown',\n            dblclick: 'onPointerDblClick'\n        },\n        documentEvents: {\n            mousemove: 'onPointerMove',\n            touchmove: 'onPointerMove',\n            mouseup: 'onPointerUp',\n            touchend: 'onPointerUp'\n        },\n        options: {\n            snap: snapAnchor,\n            anchor: getAnchor,\n            customAnchorAttributes: {\n                'stroke-width': 4,\n                stroke: '#33334F',\n                fill: '#FFFFFF',\n                r: 5\n            },\n            defaultAnchorAttributes: {\n                'stroke-width': 2,\n                stroke: '#FFFFFF',\n                fill: '#33334F',\n                r: 6\n            },\n            areaPadding: 6,\n            snapRadius: 10,\n            restrictArea: true,\n            redundancyRemoval: true\n        },\n        onRender: function() {\n            this.renderChildren()\n            this.toggleArea(false)\n            this.update()\n        },\n        update: function() {\n            const {type} = this\n            const {relatedView} = this\n            const view = relatedView.getEndView(type)\n            if (view) {\n                this.updateAnchor()\n                this.updateArea()\n                this.el.style.display = ''\n            } else {\n                this.el.style.display = 'none'\n            }\n            return this\n        },\n        updateAnchor: function() {\n            const {childNodes} = this\n            if (!childNodes) return\n            const anchorNode = childNodes.anchor\n            if (!anchorNode) return\n            const {relatedView} = this\n            const {type} = this\n            const position = relatedView.getEndAnchor(type)\n            const {options} = this\n            const customAnchor = relatedView.model.prop([type, 'anchor'])\n            anchorNode.setAttribute('transform', `translate(${  position.x  },${  position.y  })`)\n            const anchorAttributes = (customAnchor) ? options.customAnchorAttributes : options.defaultAnchorAttributes\n            for (const attrName in anchorAttributes) {\n                anchorNode.setAttribute(attrName, anchorAttributes[attrName])\n            }\n        },\n        updateArea: function() {\n            const {childNodes} = this\n            if (!childNodes) return\n            const areaNode = childNodes.area\n            if (!areaNode) return\n            const {relatedView} = this\n            const {type} = this\n            const view = relatedView.getEndView(type)\n            const magnet = relatedView.getEndMagnet(type)\n            let padding = this.options.areaPadding\n            if (!isFinite(padding)) padding = 0\n            const bbox = view.getNodeUnrotatedBBox(magnet).inflate(padding)\n            const angle = view.model.angle()\n            areaNode.setAttribute('x', -bbox.width / 2)\n            areaNode.setAttribute('y', -bbox.height / 2)\n            areaNode.setAttribute('width', bbox.width)\n            areaNode.setAttribute('height', bbox.height)\n            const origin = view.model.getBBox().center()\n            const center = bbox.center().rotate(origin, -angle)\n            areaNode.setAttribute('transform', `translate(${  center.x  },${  center.y  }) rotate(${  angle })`)\n        },\n        toggleArea: function(visible) {\n            this.childNodes.area.style.display = (visible) ? '' : 'none'\n        },\n        onPointerDown: function(evt) {\n            evt.stopPropagation()\n            this.paper.undelegateEvents()\n            this.delegateDocumentEvents()\n            this.focus()\n            this.toggleArea(this.options.restrictArea)\n            this.relatedView.model.startBatch('anchor-move', { ui: true, tool: this.cid })\n        },\n        resetAnchor: function(anchor) {\n            const {type} = this\n            const relatedModel = this.relatedView.model\n            if (anchor) {\n                relatedModel.prop([type, 'anchor'], anchor, {\n                    rewrite: true,\n                    ui: true,\n                    tool: this.cid\n                })\n            } else {\n                relatedModel.removeProp([type, 'anchor'], {\n                    ui: true,\n                    tool: this.cid\n                })\n            }\n        },\n        onPointerMove: function(evt) {\n\n            const {relatedView} = this\n            const {type} = this\n            const view = relatedView.getEndView(type)\n            const magnet = relatedView.getEndMagnet(type)\n\n            let coords = this.paper.clientToLocalPoint(evt.clientX, evt.clientY)\n            const snapFn = this.options.snap\n            if (typeof snapFn === 'function') {\n                coords = snapFn.call(relatedView, coords, view, magnet, type, relatedView, this)\n                coords = new g.Point(coords)\n            }\n\n            if (this.options.restrictArea) {\n                // snap coords within node bbox\n                const bbox = view.getNodeUnrotatedBBox(magnet)\n                const angle = view.model.angle()\n                const origin = view.model.getBBox().center()\n                const rotatedCoords = coords.clone().rotate(origin, angle)\n                if (!bbox.containsPoint(rotatedCoords)) {\n                    coords = bbox.pointNearestToPoint(rotatedCoords).rotate(origin, -angle)\n                }\n            }\n\n            let anchor\n            const anchorFn = this.options.anchor\n            if (typeof anchorFn === 'function') {\n                anchor = anchorFn.call(relatedView, coords, view, magnet, type, relatedView)\n            }\n\n            this.resetAnchor(anchor)\n            this.update()\n        },\n\n        onPointerUp: function(evt) {\n            this.paper.delegateEvents()\n            this.undelegateDocumentEvents()\n            this.blur()\n            this.toggleArea(false)\n            const linkView = this.relatedView\n            if (this.options.redundancyRemoval) linkView.removeRedundantLinearVertices({ ui: true, tool: this.cid })\n            linkView.model.stopBatch('anchor-move', { ui: true, tool: this.cid })\n        },\n\n        onPointerDblClick: function() {\n            this.resetAnchor()\n            this.update()\n        }\n    })\n\n    const SourceAnchor = Anchor.extend({\n        name: 'source-anchor',\n        type: 'source'\n    })\n\n    const TargetAnchor = Anchor.extend({\n        name: 'target-anchor',\n        type: 'target'\n    })\n\n    // Export\n    joint.linkTools = {\n        Vertices: Vertices,\n        Segments: Segments,\n        SourceArrowhead: SourceArrowhead,\n        TargetArrowhead: TargetArrowhead,\n        SourceAnchor: SourceAnchor,\n        TargetAnchor: TargetAnchor,\n        Button: Button,\n        Remove: Remove,\n        Boundary: Boundary\n    }\n\n})(joint, joint.util, V, g)\n\njoint.dia.Element.define('erd.Entity', {\n    size: { width: 150, height: 60 },\n    attrs: {\n        '.outer': {\n            fill: '#2ECC71', stroke: '#27AE60', 'stroke-width': 2,\n            points: '100,0 100,60 0,60 0,0'\n        },\n        '.inner': {\n            fill: '#2ECC71', stroke: '#27AE60', 'stroke-width': 2,\n            points: '95,5 95,55 5,55 5,5',\n            display: 'none'\n        },\n        text: {\n            text: 'Entity',\n            'font-family': 'Arial', 'font-size': 14,\n            'ref-x': .5, 'ref-y': .5,\n            'y-alignment': 'middle', 'text-anchor': 'middle'\n        }\n    }\n}, {\n    markup: '<g class=\"rotatable\"><g class=\"scalable\"><polygon class=\"outer\"/><polygon class=\"inner\"/></g><text/></g>',\n})\n\n\njoint.shapes.erd.Entity.define('erd.WeakEntity', {\n    attrs: {\n        '.inner': { display: 'auto' },\n        text: { text: 'Weak Entity' }\n    }\n})\n\njoint.dia.Element.define('erd.Relationship', {\n    size: { width: 80, height: 80 },\n    attrs: {\n        '.outer': {\n            fill: '#3498DB', stroke: '#2980B9', 'stroke-width': 2,\n            points: '40,0 80,40 40,80 0,40'\n        },\n        '.inner': {\n            fill: '#3498DB', stroke: '#2980B9', 'stroke-width': 2,\n            points: '40,5 75,40 40,75 5,40',\n            display: 'none'\n        },\n        text: {\n            text: 'Relationship',\n            'font-family': 'Arial', 'font-size': 12,\n            'ref-x': .5, 'ref-y': .5,\n            'y-alignment': 'middle', 'text-anchor': 'middle'\n        }\n    }\n}, {\n    markup: '<g class=\"rotatable\"><g class=\"scalable\"><polygon class=\"outer\"/><polygon class=\"inner\"/></g><text/></g>',\n})\n\njoint.shapes.erd.Relationship.define('erd.IdentifyingRelationship', {\n    attrs: {\n        '.inner': { display: 'auto' },\n        text: { text: 'Identifying' }\n    }\n})\n\njoint.dia.Element.define('erd.Attribute', {\n    size: { width: 100, height: 50 },\n    attrs: {\n        ellipse: {\n            transform: 'translate(50, 25)'\n        },\n        '.outer': {\n            stroke: '#D35400', 'stroke-width': 2,\n            cx: 0, cy: 0, rx: 50, ry: 25,\n            fill: '#E67E22'\n        },\n        '.inner': {\n            stroke: '#D35400', 'stroke-width': 2,\n            cx: 0, cy: 0, rx: 45, ry: 20,\n            fill: '#E67E22', display: 'none'\n        },\n        text: {\n            'font-family': 'Arial', 'font-size': 14,\n            'ref-x': .5, 'ref-y': .5,\n            'y-alignment': 'middle', 'text-anchor': 'middle'\n        }\n    }\n}, {\n    markup: '<g class=\"rotatable\"><g class=\"scalable\"><ellipse class=\"outer\"/><ellipse class=\"inner\"/></g><text/></g>',\n})\n\njoint.shapes.erd.Attribute.define('erd.Multivalued', {\n    attrs: {\n        '.inner': { display: 'block' },\n        text: { text: 'multivalued' }\n    }\n})\n\njoint.shapes.erd.Attribute.define('erd.Derived', {\n    attrs: {\n        '.outer': { 'stroke-dasharray': '3,5' },\n        text: { text: 'derived' }\n    }\n})\n\njoint.shapes.erd.Attribute.define('erd.Key', {\n    attrs: {\n        ellipse: { 'stroke-width': 4 },\n        text: { text: 'key', 'font-weight': '800', 'text-decoration': 'underline' }\n    }\n})\n\njoint.shapes.erd.Attribute.define('erd.Normal', {\n    attrs: { text: { text: 'Normal' }}\n})\n\njoint.dia.Element.define('erd.ISA', {\n    type: 'erd.ISA',\n    size: { width: 100, height: 50 },\n    attrs: {\n        polygon: {\n            points: '0,0 50,50 100,0',\n            fill: '#F1C40F', stroke: '#F39C12', 'stroke-width': 2\n        },\n        text: {\n            text: 'ISA', 'font-size': 18,\n            'ref-x': .5, 'ref-y': .3,\n            'y-alignment': 'middle', 'text-anchor': 'middle'\n        }\n    }\n}, {\n    markup: '<g class=\"rotatable\"><g class=\"scalable\"><polygon/></g><text/></g>',\n})\n\njoint.dia.Link.define('erd.Line', {}, {\n    cardinality: function(value) {\n        this.set('labels', [{ position: -20, attrs: { text: { dy: -8, text: value }}}])\n    }\n})\n\njoint.shapes.basic.Circle.define('fsa.State', {\n    attrs: {\n        circle: { 'stroke-width': 3 },\n        text: { 'font-weight': '800' }\n    }\n})\n\njoint.dia.Element.define('fsa.StartState', {\n    size: { width: 20, height: 20 },\n    attrs: {\n        circle: {\n            transform: 'translate(10, 10)',\n            r: 10,\n            fill: '#000000'\n        }\n    }\n}, {\n    markup: '<g class=\"rotatable\"><g class=\"scalable\"><circle/></g></g>',\n})\n\njoint.dia.Element.define('fsa.EndState', {\n    size: { width: 20, height: 20 },\n    attrs: {\n        '.outer': {\n            transform: 'translate(10, 10)',\n            r: 10,\n            fill: '#ffffff',\n            stroke: '#000000'\n        },\n\n        '.inner': {\n            transform: 'translate(10, 10)',\n            r: 6,\n            fill: '#000000'\n        }\n    }\n}, {\n    markup: '<g class=\"rotatable\"><g class=\"scalable\"><circle class=\"outer\"/><circle class=\"inner\"/></g></g>',\n})\n\njoint.dia.Link.define('fsa.Arrow', {\n    attrs: { '.marker-target': { d: 'M 10 0 L 0 5 L 10 10 z' }},\n    smooth: true\n})\n\njoint.dia.Element.define('org.Member', {\n    size: { width: 180, height: 70 },\n    attrs: {\n        rect: { width: 170, height: 60 },\n\n        '.card': {\n            fill: '#FFFFFF', stroke: '#000000', 'stroke-width': 2,\n            'pointer-events': 'visiblePainted', rx: 10, ry: 10\n        },\n\n        image: {\n            width: 48, height: 48,\n            ref: '.card', 'ref-x': 10, 'ref-y': 5\n        },\n\n        '.rank': {\n            'text-decoration': 'underline',\n            ref: '.card', 'ref-x': 0.9, 'ref-y': 0.2,\n            'font-family': 'Courier New', 'font-size': 14,\n            'text-anchor': 'end'\n        },\n\n        '.name': {\n            'font-weight': '800',\n            ref: '.card', 'ref-x': 0.9, 'ref-y': 0.6,\n            'font-family': 'Courier New', 'font-size': 14,\n            'text-anchor': 'end'\n        }\n    }\n}, {\n    markup: '<g class=\"rotatable\"><g class=\"scalable\"><rect class=\"card\"/><image/></g><text class=\"rank\"/><text class=\"name\"/></g>',\n})\n\njoint.dia.Link.define('org.Arrow', {\n    source: { selector: '.card' }, target: { selector: '.card' },\n    attrs: { '.connection': { stroke: '#585858', 'stroke-width': 3 }},\n    z: -1\n})\n\njoint.shapes.basic.Generic.define('chess.KingWhite', {\n    size: { width: 42, height: 38 }\n}, {\n    markup: '<g class=\"rotatable\"><g class=\"scalable\"><g style=\"fill:none; fill-opacity:1; fill-rule:evenodd; stroke:#000000; stroke-width:1.5; stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:4; stroke-dasharray:none; stroke-opacity:1;\"><path      d=\"M 22.5,11.63 L 22.5,6\"      style=\"fill:none; stroke:#000000; stroke-linejoin:miter;\" />    <path      d=\"M 20,8 L 25,8\"      style=\"fill:none; stroke:#000000; stroke-linejoin:miter;\" />    <path      d=\"M 22.5,25 C 22.5,25 27,17.5 25.5,14.5 C 25.5,14.5 24.5,12 22.5,12 C 20.5,12 19.5,14.5 19.5,14.5 C 18,17.5 22.5,25 22.5,25\"      style=\"fill:#ffffff; stroke:#000000; stroke-linecap:butt; stroke-linejoin:miter;\" />    <path      d=\"M 11.5,37 C 17,40.5 27,40.5 32.5,37 L 32.5,30 C 32.5,30 41.5,25.5 38.5,19.5 C 34.5,13 25,16 22.5,23.5 L 22.5,27 L 22.5,23.5 C 19,16 9.5,13 6.5,19.5 C 3.5,25.5 11.5,29.5 11.5,29.5 L 11.5,37 z \"      style=\"fill:#ffffff; stroke:#000000;\" />    <path      d=\"M 11.5,30 C 17,27 27,27 32.5,30\"      style=\"fill:none; stroke:#000000;\" />    <path      d=\"M 11.5,33.5 C 17,30.5 27,30.5 32.5,33.5\"      style=\"fill:none; stroke:#000000;\" />    <path      d=\"M 11.5,37 C 17,34 27,34 32.5,37\"      style=\"fill:none; stroke:#000000;\" />  </g></g></g>'\n})\n\njoint.shapes.basic.Generic.define('chess.KingBlack', {\n    size: { width: 42, height: 38 }\n}, {\n    markup: '<g class=\"rotatable\"><g class=\"scalable\"><g style=\"fill:none; fill-opacity:1; fill-rule:evenodd; stroke:#000000; stroke-width:1.5; stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:4; stroke-dasharray:none; stroke-opacity:1;\">    <path       d=\"M 22.5,11.63 L 22.5,6\"       style=\"fill:none; stroke:#000000; stroke-linejoin:miter;\"       id=\"path6570\" />    <path       d=\"M 22.5,25 C 22.5,25 27,17.5 25.5,14.5 C 25.5,14.5 24.5,12 22.5,12 C 20.5,12 19.5,14.5 19.5,14.5 C 18,17.5 22.5,25 22.5,25\"       style=\"fill:#000000;fill-opacity:1; stroke-linecap:butt; stroke-linejoin:miter;\" />    <path       d=\"M 11.5,37 C 17,40.5 27,40.5 32.5,37 L 32.5,30 C 32.5,30 41.5,25.5 38.5,19.5 C 34.5,13 25,16 22.5,23.5 L 22.5,27 L 22.5,23.5 C 19,16 9.5,13 6.5,19.5 C 3.5,25.5 11.5,29.5 11.5,29.5 L 11.5,37 z \"       style=\"fill:#000000; stroke:#000000;\" />    <path       d=\"M 20,8 L 25,8\"       style=\"fill:none; stroke:#000000; stroke-linejoin:miter;\" />    <path       d=\"M 32,29.5 C 32,29.5 40.5,25.5 38.03,19.85 C 34.15,14 25,18 22.5,24.5 L 22.51,26.6 L 22.5,24.5 C 20,18 9.906,14 6.997,19.85 C 4.5,25.5 11.85,28.85 11.85,28.85\"       style=\"fill:none; stroke:#ffffff;\" />    <path       d=\"M 11.5,30 C 17,27 27,27 32.5,30 M 11.5,33.5 C 17,30.5 27,30.5 32.5,33.5 M 11.5,37 C 17,34 27,34 32.5,37\"       style=\"fill:none; stroke:#ffffff;\" />  </g></g></g>'\n})\n\njoint.shapes.basic.Generic.define('chess.QueenWhite', {\n    size: { width: 42, height: 38 }\n}, {\n    markup: '<g class=\"rotatable\"><g class=\"scalable\"><g style=\"opacity:1; fill:#ffffff; fill-opacity:1; fill-rule:evenodd; stroke:#000000; stroke-width:1.5; stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:4; stroke-dasharray:none; stroke-opacity:1;\">    <path      d=\"M 9 13 A 2 2 0 1 1  5,13 A 2 2 0 1 1  9 13 z\"      transform=\"translate(-1,-1)\" />    <path      d=\"M 9 13 A 2 2 0 1 1  5,13 A 2 2 0 1 1  9 13 z\"      transform=\"translate(15.5,-5.5)\" />    <path      d=\"M 9 13 A 2 2 0 1 1  5,13 A 2 2 0 1 1  9 13 z\"      transform=\"translate(32,-1)\" />    <path      d=\"M 9 13 A 2 2 0 1 1  5,13 A 2 2 0 1 1  9 13 z\"      transform=\"translate(7,-4.5)\" />    <path      d=\"M 9 13 A 2 2 0 1 1  5,13 A 2 2 0 1 1  9 13 z\"      transform=\"translate(24,-4)\" />    <path      d=\"M 9,26 C 17.5,24.5 30,24.5 36,26 L 38,14 L 31,25 L 31,11 L 25.5,24.5 L 22.5,9.5 L 19.5,24.5 L 14,10.5 L 14,25 L 7,14 L 9,26 z \"      style=\"stroke-linecap:butt;\" />    <path      d=\"M 9,26 C 9,28 10.5,28 11.5,30 C 12.5,31.5 12.5,31 12,33.5 C 10.5,34.5 10.5,36 10.5,36 C 9,37.5 11,38.5 11,38.5 C 17.5,39.5 27.5,39.5 34,38.5 C 34,38.5 35.5,37.5 34,36 C 34,36 34.5,34.5 33,33.5 C 32.5,31 32.5,31.5 33.5,30 C 34.5,28 36,28 36,26 C 27.5,24.5 17.5,24.5 9,26 z \"      style=\"stroke-linecap:butt;\" />    <path      d=\"M 11.5,30 C 15,29 30,29 33.5,30\"      style=\"fill:none;\" />    <path      d=\"M 12,33.5 C 18,32.5 27,32.5 33,33.5\"      style=\"fill:none;\" />  </g></g></g>'\n})\n\njoint.shapes.basic.Generic.define('chess.QueenBlack', {\n    size: { width: 42, height: 38 }\n}, {\n    markup: '<g class=\"rotatable\"><g class=\"scalable\"><g style=\"opacity:1; fill:#000000; fill-opacity:1; fill-rule:evenodd; stroke:#000000; stroke-width:1.5; stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:4; stroke-dasharray:none; stroke-opacity:1;\">    <g style=\"fill:#000000; stroke:none;\">      <circle cx=\"6\"    cy=\"12\" r=\"2.75\" />      <circle cx=\"14\"   cy=\"9\"  r=\"2.75\" />      <circle cx=\"22.5\" cy=\"8\"  r=\"2.75\" />      <circle cx=\"31\"   cy=\"9\"  r=\"2.75\" />      <circle cx=\"39\"   cy=\"12\" r=\"2.75\" />    </g>    <path       d=\"M 9,26 C 17.5,24.5 30,24.5 36,26 L 38.5,13.5 L 31,25 L 30.7,10.9 L 25.5,24.5 L 22.5,10 L 19.5,24.5 L 14.3,10.9 L 14,25 L 6.5,13.5 L 9,26 z\"       style=\"stroke-linecap:butt; stroke:#000000;\" />    <path       d=\"M 9,26 C 9,28 10.5,28 11.5,30 C 12.5,31.5 12.5,31 12,33.5 C 10.5,34.5 10.5,36 10.5,36 C 9,37.5 11,38.5 11,38.5 C 17.5,39.5 27.5,39.5 34,38.5 C 34,38.5 35.5,37.5 34,36 C 34,36 34.5,34.5 33,33.5 C 32.5,31 32.5,31.5 33.5,30 C 34.5,28 36,28 36,26 C 27.5,24.5 17.5,24.5 9,26 z\"       style=\"stroke-linecap:butt;\" />    <path       d=\"M 11,38.5 A 35,35 1 0 0 34,38.5\"       style=\"fill:none; stroke:#000000; stroke-linecap:butt;\" />    <path       d=\"M 11,29 A 35,35 1 0 1 34,29\"       style=\"fill:none; stroke:#ffffff;\" />    <path       d=\"M 12.5,31.5 L 32.5,31.5\"       style=\"fill:none; stroke:#ffffff;\" />    <path       d=\"M 11.5,34.5 A 35,35 1 0 0 33.5,34.5\"       style=\"fill:none; stroke:#ffffff;\" />    <path       d=\"M 10.5,37.5 A 35,35 1 0 0 34.5,37.5\"       style=\"fill:none; stroke:#ffffff;\" />  </g></g></g>'\n})\n\njoint.shapes.basic.Generic.define('chess.RookWhite', {\n    size: { width: 32, height: 34 }\n}, {\n    markup: '<g class=\"rotatable\"><g class=\"scalable\"><g style=\"opacity:1; fill:#ffffff; fill-opacity:1; fill-rule:evenodd; stroke:#000000; stroke-width:1.5; stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:4; stroke-dasharray:none; stroke-opacity:1;\">    <path      d=\"M 9,39 L 36,39 L 36,36 L 9,36 L 9,39 z \"      style=\"stroke-linecap:butt;\" />    <path      d=\"M 12,36 L 12,32 L 33,32 L 33,36 L 12,36 z \"      style=\"stroke-linecap:butt;\" />    <path      d=\"M 11,14 L 11,9 L 15,9 L 15,11 L 20,11 L 20,9 L 25,9 L 25,11 L 30,11 L 30,9 L 34,9 L 34,14\"      style=\"stroke-linecap:butt;\" />    <path      d=\"M 34,14 L 31,17 L 14,17 L 11,14\" />    <path      d=\"M 31,17 L 31,29.5 L 14,29.5 L 14,17\"      style=\"stroke-linecap:butt; stroke-linejoin:miter;\" />    <path      d=\"M 31,29.5 L 32.5,32 L 12.5,32 L 14,29.5\" />    <path      d=\"M 11,14 L 34,14\"      style=\"fill:none; stroke:#000000; stroke-linejoin:miter;\" />  </g></g></g>'\n})\n\njoint.shapes.basic.Generic.define('chess.RookBlack', {\n    size: { width: 32, height: 34 }\n}, {\n    markup: '<g class=\"rotatable\"><g class=\"scalable\"><g style=\"opacity:1; fill:#000000; fill-opacity:1; fill-rule:evenodd; stroke:#000000; stroke-width:1.5; stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:4; stroke-dasharray:none; stroke-opacity:1;\">    <path      d=\"M 9,39 L 36,39 L 36,36 L 9,36 L 9,39 z \"      style=\"stroke-linecap:butt;\" />    <path      d=\"M 12.5,32 L 14,29.5 L 31,29.5 L 32.5,32 L 12.5,32 z \"      style=\"stroke-linecap:butt;\" />    <path      d=\"M 12,36 L 12,32 L 33,32 L 33,36 L 12,36 z \"      style=\"stroke-linecap:butt;\" />    <path      d=\"M 14,29.5 L 14,16.5 L 31,16.5 L 31,29.5 L 14,29.5 z \"      style=\"stroke-linecap:butt;stroke-linejoin:miter;\" />    <path      d=\"M 14,16.5 L 11,14 L 34,14 L 31,16.5 L 14,16.5 z \"      style=\"stroke-linecap:butt;\" />    <path      d=\"M 11,14 L 11,9 L 15,9 L 15,11 L 20,11 L 20,9 L 25,9 L 25,11 L 30,11 L 30,9 L 34,9 L 34,14 L 11,14 z \"      style=\"stroke-linecap:butt;\" />    <path      d=\"M 12,35.5 L 33,35.5 L 33,35.5\"      style=\"fill:none; stroke:#ffffff; stroke-width:1; stroke-linejoin:miter;\" />    <path      d=\"M 13,31.5 L 32,31.5\"      style=\"fill:none; stroke:#ffffff; stroke-width:1; stroke-linejoin:miter;\" />    <path      d=\"M 14,29.5 L 31,29.5\"      style=\"fill:none; stroke:#ffffff; stroke-width:1; stroke-linejoin:miter;\" />    <path      d=\"M 14,16.5 L 31,16.5\"      style=\"fill:none; stroke:#ffffff; stroke-width:1; stroke-linejoin:miter;\" />    <path      d=\"M 11,14 L 34,14\"      style=\"fill:none; stroke:#ffffff; stroke-width:1; stroke-linejoin:miter;\" />  </g></g></g>'\n})\n\njoint.shapes.basic.Generic.define('chess.BishopWhite', {\n    size: { width: 38, height: 38 }\n}, {\n    markup: '<g class=\"rotatable\"><g class=\"scalable\"><g style=\"opacity:1; fill:none; fill-rule:evenodd; fill-opacity:1; stroke:#000000; stroke-width:1.5; stroke-linecap:round; stroke-linejoin:round; stroke-miterlimit:4; stroke-dasharray:none; stroke-opacity:1;\">    <g style=\"fill:#ffffff; stroke:#000000; stroke-linecap:butt;\">       <path        d=\"M 9,36 C 12.39,35.03 19.11,36.43 22.5,34 C 25.89,36.43 32.61,35.03 36,36 C 36,36 37.65,36.54 39,38 C 38.32,38.97 37.35,38.99 36,38.5 C 32.61,37.53 25.89,38.96 22.5,37.5 C 19.11,38.96 12.39,37.53 9,38.5 C 7.646,38.99 6.677,38.97 6,38 C 7.354,36.06 9,36 9,36 z\" />      <path        d=\"M 15,32 C 17.5,34.5 27.5,34.5 30,32 C 30.5,30.5 30,30 30,30 C 30,27.5 27.5,26 27.5,26 C 33,24.5 33.5,14.5 22.5,10.5 C 11.5,14.5 12,24.5 17.5,26 C 17.5,26 15,27.5 15,30 C 15,30 14.5,30.5 15,32 z\" />      <path        d=\"M 25 8 A 2.5 2.5 0 1 1  20,8 A 2.5 2.5 0 1 1  25 8 z\" />    </g>    <path      d=\"M 17.5,26 L 27.5,26 M 15,30 L 30,30 M 22.5,15.5 L 22.5,20.5 M 20,18 L 25,18\"      style=\"fill:none; stroke:#000000; stroke-linejoin:miter;\" />  </g></g></g>'\n})\n\njoint.shapes.basic.Generic.define('chess.BishopBlack', {\n    size: { width: 38, height: 38 }\n}, {\n    markup: '<g class=\"rotatable\"><g class=\"scalable\"><g style=\"opacity:1; fill:none; fill-rule:evenodd; fill-opacity:1; stroke:#000000; stroke-width:1.5; stroke-linecap:round; stroke-linejoin:round; stroke-miterlimit:4; stroke-dasharray:none; stroke-opacity:1;\">    <g style=\"fill:#000000; stroke:#000000; stroke-linecap:butt;\">       <path        d=\"M 9,36 C 12.39,35.03 19.11,36.43 22.5,34 C 25.89,36.43 32.61,35.03 36,36 C 36,36 37.65,36.54 39,38 C 38.32,38.97 37.35,38.99 36,38.5 C 32.61,37.53 25.89,38.96 22.5,37.5 C 19.11,38.96 12.39,37.53 9,38.5 C 7.646,38.99 6.677,38.97 6,38 C 7.354,36.06 9,36 9,36 z\" />      <path        d=\"M 15,32 C 17.5,34.5 27.5,34.5 30,32 C 30.5,30.5 30,30 30,30 C 30,27.5 27.5,26 27.5,26 C 33,24.5 33.5,14.5 22.5,10.5 C 11.5,14.5 12,24.5 17.5,26 C 17.5,26 15,27.5 15,30 C 15,30 14.5,30.5 15,32 z\" />      <path        d=\"M 25 8 A 2.5 2.5 0 1 1  20,8 A 2.5 2.5 0 1 1  25 8 z\" />    </g>    <path       d=\"M 17.5,26 L 27.5,26 M 15,30 L 30,30 M 22.5,15.5 L 22.5,20.5 M 20,18 L 25,18\"       style=\"fill:none; stroke:#ffffff; stroke-linejoin:miter;\" />  </g></g></g>'\n})\n\njoint.shapes.basic.Generic.define('chess.KnightWhite', {\n    size: { width: 38, height: 37 }\n}, {\n    markup: '<g class=\"rotatable\"><g class=\"scalable\"><g style=\"opacity:1; fill:none; fill-opacity:1; fill-rule:evenodd; stroke:#000000; stroke-width:1.5; stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:4; stroke-dasharray:none; stroke-opacity:1;\">    <path      d=\"M 22,10 C 32.5,11 38.5,18 38,39 L 15,39 C 15,30 25,32.5 23,18\"      style=\"fill:#ffffff; stroke:#000000;\" />    <path      d=\"M 24,18 C 24.38,20.91 18.45,25.37 16,27 C 13,29 13.18,31.34 11,31 C 9.958,30.06 12.41,27.96 11,28 C 10,28 11.19,29.23 10,30 C 9,30 5.997,31 6,26 C 6,24 12,14 12,14 C 12,14 13.89,12.1 14,10.5 C 13.27,9.506 13.5,8.5 13.5,7.5 C 14.5,6.5 16.5,10 16.5,10 L 18.5,10 C 18.5,10 19.28,8.008 21,7 C 22,7 22,10 22,10\"      style=\"fill:#ffffff; stroke:#000000;\" />    <path      d=\"M 9.5 25.5 A 0.5 0.5 0 1 1 8.5,25.5 A 0.5 0.5 0 1 1 9.5 25.5 z\"      style=\"fill:#000000; stroke:#000000;\" />    <path      d=\"M 15 15.5 A 0.5 1.5 0 1 1  14,15.5 A 0.5 1.5 0 1 1  15 15.5 z\"      transform=\"matrix(0.866,0.5,-0.5,0.866,9.693,-5.173)\"      style=\"fill:#000000; stroke:#000000;\" />  </g></g></g>'\n})\n\njoint.shapes.basic.Generic.define('chess.KnightBlack', {\n    size: { width: 38, height: 37 }\n}, {\n    markup: '<g class=\"rotatable\"><g class=\"scalable\"><g style=\"opacity:1; fill:none; fill-opacity:1; fill-rule:evenodd; stroke:#000000; stroke-width:1.5; stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:4; stroke-dasharray:none; stroke-opacity:1;\">    <path      d=\"M 22,10 C 32.5,11 38.5,18 38,39 L 15,39 C 15,30 25,32.5 23,18\"      style=\"fill:#000000; stroke:#000000;\" />    <path      d=\"M 24,18 C 24.38,20.91 18.45,25.37 16,27 C 13,29 13.18,31.34 11,31 C 9.958,30.06 12.41,27.96 11,28 C 10,28 11.19,29.23 10,30 C 9,30 5.997,31 6,26 C 6,24 12,14 12,14 C 12,14 13.89,12.1 14,10.5 C 13.27,9.506 13.5,8.5 13.5,7.5 C 14.5,6.5 16.5,10 16.5,10 L 18.5,10 C 18.5,10 19.28,8.008 21,7 C 22,7 22,10 22,10\"      style=\"fill:#000000; stroke:#000000;\" />    <path      d=\"M 9.5 25.5 A 0.5 0.5 0 1 1 8.5,25.5 A 0.5 0.5 0 1 1 9.5 25.5 z\"      style=\"fill:#ffffff; stroke:#ffffff;\" />    <path      d=\"M 15 15.5 A 0.5 1.5 0 1 1  14,15.5 A 0.5 1.5 0 1 1  15 15.5 z\"      transform=\"matrix(0.866,0.5,-0.5,0.866,9.693,-5.173)\"      style=\"fill:#ffffff; stroke:#ffffff;\" />    <path      d=\"M 24.55,10.4 L 24.1,11.85 L 24.6,12 C 27.75,13 30.25,14.49 32.5,18.75 C 34.75,23.01 35.75,29.06 35.25,39 L 35.2,39.5 L 37.45,39.5 L 37.5,39 C 38,28.94 36.62,22.15 34.25,17.66 C 31.88,13.17 28.46,11.02 25.06,10.5 L 24.55,10.4 z \"      style=\"fill:#ffffff; stroke:none;\" />  </g></g></g>'\n})\n\njoint.shapes.basic.Generic.define('chess.PawnWhite', {\n    size: { width: 28, height: 33 }\n}, {\n    markup: '<g class=\"rotatable\"><g class=\"scalable\"><path d=\"M 22,9 C 19.79,9 18,10.79 18,13 C 18,13.89 18.29,14.71 18.78,15.38 C 16.83,16.5 15.5,18.59 15.5,21 C 15.5,23.03 16.44,24.84 17.91,26.03 C 14.91,27.09 10.5,31.58 10.5,39.5 L 33.5,39.5 C 33.5,31.58 29.09,27.09 26.09,26.03 C 27.56,24.84 28.5,23.03 28.5,21 C 28.5,18.59 27.17,16.5 25.22,15.38 C 25.71,14.71 26,13.89 26,13 C 26,10.79 24.21,9 22,9 z \"  style=\"opacity:1; fill:#ffffff; fill-opacity:1; fill-rule:nonzero; stroke:#000000; stroke-width:1.5; stroke-linecap:round; stroke-linejoin:miter; stroke-miterlimit:4; stroke-dasharray:none; stroke-opacity:1;\" /></g></g>'\n})\n\njoint.shapes.basic.Generic.define('chess.PawnBlack', {\n    size: { width: 28, height: 33 }\n}, {\n    markup: '<g class=\"rotatable\"><g class=\"scalable\"><path d=\"M 22,9 C 19.79,9 18,10.79 18,13 C 18,13.89 18.29,14.71 18.78,15.38 C 16.83,16.5 15.5,18.59 15.5,21 C 15.5,23.03 16.44,24.84 17.91,26.03 C 14.91,27.09 10.5,31.58 10.5,39.5 L 33.5,39.5 C 33.5,31.58 29.09,27.09 26.09,26.03 C 27.56,24.84 28.5,23.03 28.5,21 C 28.5,18.59 27.17,16.5 25.22,15.38 C 25.71,14.71 26,13.89 26,13 C 26,10.79 24.21,9 22,9 z \"  style=\"opacity:1; fill:#000000; fill-opacity:1; fill-rule:nonzero; stroke:#000000; stroke-width:1.5; stroke-linecap:round; stroke-linejoin:miter; stroke-miterlimit:4; stroke-dasharray:none; stroke-opacity:1;\" /></g></g>'\n})\n\njoint.shapes.basic.Generic.define('pn.Place', {\n    size: { width: 50, height: 50 },\n    attrs: {\n        '.root': {\n            r: 25,\n            fill: '#ffffff',\n            stroke: '#000000',\n            transform: 'translate(25, 25)'\n        },\n        '.label': {\n            'text-anchor': 'middle',\n            'ref-x': .5,\n            'ref-y': -20,\n            ref: '.root',\n            fill: '#000000',\n            'font-size': 12\n        },\n        '.tokens > circle': {\n            fill: '#000000',\n            r: 5\n        },\n        '.tokens.one > circle': { transform: 'translate(25, 25)' },\n\n        '.tokens.two > circle:nth-child(1)': { transform: 'translate(19, 25)' },\n        '.tokens.two > circle:nth-child(2)': { transform: 'translate(31, 25)' },\n\n        '.tokens.three > circle:nth-child(1)': { transform: 'translate(18, 29)' },\n        '.tokens.three > circle:nth-child(2)': { transform: 'translate(25, 19)' },\n        '.tokens.three > circle:nth-child(3)': { transform: 'translate(32, 29)' },\n\n        '.tokens.alot > text': {\n            transform: 'translate(25, 18)',\n            'text-anchor': 'middle',\n            fill: '#000000'\n        }\n    }\n}, {\n    markup: '<g class=\"rotatable\"><g class=\"scalable\"><circle class=\"root\"/><g class=\"tokens\" /></g><text class=\"label\"/></g>',\n})\n\njoint.shapes.pn.PlaceView = joint.dia.ElementView.extend({}, {\n\n    initialize: function() {\n\n        joint.dia.ElementView.prototype.initialize.apply(this, arguments)\n\n        this.model.on('change:tokens', function() {\n\n            this.renderTokens()\n            this.update()\n\n        }, this)\n    },\n\n    render: function() {\n\n        joint.dia.ElementView.prototype.render.apply(this, arguments)\n\n        this.renderTokens()\n        this.update()\n    },\n\n    renderTokens: function() {\n\n        const $tokens = this.$('.tokens').empty()\n        $tokens[0].className.baseVal = 'tokens'\n\n        const tokens = this.model.get('tokens')\n\n        if (!tokens) return\n\n        switch (tokens) {\n\n            case 1:\n                $tokens[0].className.baseVal += ' one'\n                $tokens.append(V('<circle/>').node)\n                break\n\n            case 2:\n                $tokens[0].className.baseVal += ' two'\n                $tokens.append(V('<circle/>').node, V('<circle/>').node)\n                break\n\n            case 3:\n                $tokens[0].className.baseVal += ' three'\n                $tokens.append(V('<circle/>').node, V('<circle/>').node, V('<circle/>').node)\n                break\n\n            default:\n                $tokens[0].className.baseVal += ' alot'\n                $tokens.append(V('<text/>').text(`${tokens  }`).node)\n                break\n        }\n    }\n})\n\njoint.shapes.basic.Generic.define('pn.Transition', {\n    size: { width: 12, height: 50 },\n    attrs: {\n        rect: {\n            width: 12,\n            height: 50,\n            fill: '#000000',\n            stroke: '#000000'\n        },\n        '.label': {\n            'text-anchor': 'middle',\n            'ref-x': .5,\n            'ref-y': -20,\n            ref: 'rect',\n            fill: '#000000',\n            'font-size': 12\n        }\n    }\n}, {\n    markup: '<g class=\"rotatable\"><g class=\"scalable\"><rect class=\"root\"/></g></g><text class=\"label\"/>',\n})\n\njoint.dia.Link.define('pn.Link', {\n    attrs: { '.marker-target': { d: 'M 10 0 L 0 5 L 10 10 z' }}\n})\n\n/**\n * @deprecated use the port api insteac\n */\njoint.shapes.basic.Generic.define('devs.Model', {\n    inPorts: [],\n    outPorts: [],\n    size: {\n        width: 80,\n        height: 80\n    },\n    attrs: {\n        '.': {\n            magnet: false\n        },\n        '.label': {\n            text: 'Model',\n            'ref-x': .5,\n            'ref-y': 10,\n            'font-size': 18,\n            'text-anchor': 'middle',\n            fill: '#000'\n        },\n        '.body': {\n            'ref-width': '100%',\n            'ref-height': '100%',\n            stroke: '#000'\n        }\n    },\n    ports: {\n        groups: {\n            in: {\n                position: {\n                    name: 'left'\n                },\n                attrs: {\n                    '.port-label': {\n                        fill: '#000'\n                    },\n                    '.port-body': {\n                        fill: '#fff',\n                        stroke: '#000',\n                        r: 10,\n                        magnet: true\n                    }\n                },\n                label: {\n                    position: {\n                        name: 'left',\n                        args: {\n                            y: 10\n                        }\n                    }\n                }\n            },\n            out: {\n                position: {\n                    name: 'right'\n                },\n                attrs: {\n                    '.port-label': {\n                        fill: '#000'\n                    },\n                    '.port-body': {\n                        fill: '#fff',\n                        stroke: '#000',\n                        r: 10,\n                        magnet: true\n                    }\n                },\n                label: {\n                    position: {\n                        name: 'right',\n                        args: {\n                            y: 10\n                        }\n                    }\n                }\n            }\n        }\n    }\n}, {\n    markup: '<g class=\"rotatable\"><rect class=\"body\"/><text class=\"label\"/></g>',\n    portMarkup: '<circle class=\"port-body\"/>',\n    portLabelMarkup: '<text class=\"port-label\"/>',\n\n    initialize: function() {\n\n        joint.shapes.basic.Generic.prototype.initialize.apply(this, arguments)\n\n        this.on('change:inPorts change:outPorts', this.updatePortItems, this)\n        this.updatePortItems()\n    },\n\n    updatePortItems: function(model, changed, opt) {\n\n        // Make sure all ports are unique.\n        const inPorts = joint.util.uniq(this.get('inPorts'))\n        const outPorts = joint.util.difference(joint.util.uniq(this.get('outPorts')), inPorts)\n\n        const inPortItems = this.createPortItems('in', inPorts)\n        const outPortItems = this.createPortItems('out', outPorts)\n\n        this.prop('ports/items', inPortItems.concat(outPortItems), joint.util.assign({ rewrite: true }, opt))\n    },\n\n    createPortItem: function(group, port) {\n\n        return {\n            id: port,\n            group: group,\n            attrs: {\n                '.port-label': {\n                    text: port\n                }\n            }\n        }\n    },\n\n    createPortItems: function(group, ports) {\n\n        return joint.util.toArray(ports).map(this.createPortItem.bind(this, group))\n    },\n\n    _addGroupPort: function(port, group, opt) {\n\n        const ports = this.get(group)\n        return this.set(group, Array.isArray(ports) ? ports.concat(port) : [port], opt)\n    },\n\n    addOutPort: function(port, opt) {\n\n        return this._addGroupPort(port, 'outPorts', opt)\n    },\n\n    addInPort: function(port, opt) {\n\n        return this._addGroupPort(port, 'inPorts', opt)\n    },\n\n    _removeGroupPort: function(port, group, opt) {\n\n        return this.set(group, joint.util.without(this.get(group), port), opt)\n    },\n\n    removeOutPort: function(port, opt) {\n\n        return this._removeGroupPort(port, 'outPorts', opt)\n    },\n\n    removeInPort: function(port, opt) {\n\n        return this._removeGroupPort(port, 'inPorts', opt)\n    },\n\n    _changeGroup: function(group, properties, opt) {\n\n        return this.prop(`ports/groups/${  group}`, joint.util.isObject(properties) ? properties : {}, opt)\n    },\n\n    changeInGroup: function(properties, opt) {\n\n        return this._changeGroup('in', properties, opt)\n    },\n\n    changeOutGroup: function(properties, opt) {\n\n        return this._changeGroup('out', properties, opt)\n    }\n})\n\njoint.shapes.devs.Model.define('devs.Atomic', {\n    size: {\n        width: 80,\n        height: 80\n    },\n    attrs: {\n        '.label': {\n            text: 'Atomic'\n        }\n    }\n})\n\njoint.shapes.devs.Model.define('devs.Coupled', {\n    size: {\n        width: 200,\n        height: 300\n    },\n    attrs: {\n        '.label': {\n            text: 'Coupled'\n        }\n    }\n})\n\njoint.dia.Link.define('devs.Link', {\n    attrs: {\n        '.connection': {\n            'stroke-width': 2\n        }\n    }\n})\n\njoint.shapes.basic.Generic.define('uml.Class', {\n    attrs: {\n        rect: { width: 200 },\n\n        '.uml-class-name-rect': { stroke: 'black', 'stroke-width': 2, fill: '#3498db' },\n        '.uml-class-attrs-rect': { stroke: 'black', 'stroke-width': 2, fill: '#2980b9' },\n        '.uml-class-methods-rect': { stroke: 'black', 'stroke-width': 2, fill: '#2980b9' },\n\n        '.uml-class-name-text': {\n            ref: '.uml-class-name-rect',\n            'ref-y': .5,\n            'ref-x': .5,\n            'text-anchor': 'middle',\n            'y-alignment': 'middle',\n            'font-weight': 'bold',\n            fill: 'black',\n            'font-size': 12,\n            'font-family': 'Times New Roman'\n        },\n        '.uml-class-attrs-text': {\n            ref: '.uml-class-attrs-rect', 'ref-y': 5, 'ref-x': 5,\n            fill: 'black', 'font-size': 12, 'font-family': 'Times New Roman'\n        },\n        '.uml-class-methods-text': {\n            ref: '.uml-class-methods-rect', 'ref-y': 5, 'ref-x': 5,\n            fill: 'black', 'font-size': 12, 'font-family': 'Times New Roman'\n        }\n    },\n\n    name: [],\n    attributes: [],\n    methods: []\n}, {\n    markup: [\n        '<g class=\"rotatable\">',\n        '<g class=\"scalable\">',\n        '<rect class=\"uml-class-name-rect\"/><rect class=\"uml-class-attrs-rect\"/><rect class=\"uml-class-methods-rect\"/>',\n        '</g>',\n        '<text class=\"uml-class-name-text\"/><text class=\"uml-class-attrs-text\"/><text class=\"uml-class-methods-text\"/>',\n        '</g>'\n    ].join(''),\n\n    initialize: function() {\n\n        this.on('change:name change:attributes change:methods', function() {\n            this.updateRectangles()\n            this.trigger('uml-update')\n        }, this)\n\n        this.updateRectangles()\n\n        joint.shapes.basic.Generic.prototype.initialize.apply(this, arguments)\n    },\n\n    getClassName: function() {\n        return this.get('name')\n    },\n\n    updateRectangles: function() {\n\n        const attrs = this.get('attrs')\n\n        const rects = [\n            { type: 'name', text: this.getClassName() },\n            { type: 'attrs', text: this.get('attributes') },\n            { type: 'methods', text: this.get('methods') }\n        ]\n\n        let offsetY = 0\n\n        rects.forEach(function(rect) {\n\n            const lines = Array.isArray(rect.text) ? rect.text : [rect.text]\n            const rectHeight = lines.length * 20 + 20\n\n            attrs[`.uml-class-${  rect.type  }-text`].text = lines.join('\\n')\n            attrs[`.uml-class-${  rect.type  }-rect`].height = rectHeight\n            attrs[`.uml-class-${  rect.type  }-rect`].transform = `translate(0,${  offsetY  })`\n\n            offsetY += rectHeight\n        })\n    }\n\n})\n\njoint.shapes.uml.ClassView = joint.dia.ElementView.extend({\n\n    initialize: function() {\n\n        joint.dia.ElementView.prototype.initialize.apply(this, arguments)\n\n        this.listenTo(this.model, 'uml-update', function() {\n            this.update()\n            this.resize()\n        })\n    }\n})\n\njoint.shapes.uml.Class.define('uml.Abstract', {\n    attrs: {\n        '.uml-class-name-rect': { fill: '#e74c3c' },\n        '.uml-class-attrs-rect': { fill: '#c0392b' },\n        '.uml-class-methods-rect': { fill: '#c0392b' }\n    }\n}, {\n\n    getClassName: function() {\n        return ['<<Abstract>>', this.get('name')]\n    }\n\n})\njoint.shapes.uml.AbstractView = joint.shapes.uml.ClassView\n\njoint.shapes.uml.Class.define('uml.Interface', {\n    attrs: {\n        '.uml-class-name-rect': { fill: '#f1c40f' },\n        '.uml-class-attrs-rect': { fill: '#f39c12' },\n        '.uml-class-methods-rect': { fill: '#f39c12' }\n    }\n}, {\n    getClassName: function() {\n        return ['<<Interface>>', this.get('name')]\n    }\n})\njoint.shapes.uml.InterfaceView = joint.shapes.uml.ClassView\n\njoint.dia.Link.define('uml.Generalization', {\n    attrs: { '.marker-target': { d: 'M 20 0 L 0 10 L 20 20 z', fill: 'white' }}\n})\n\njoint.dia.Link.define('uml.Implementation', {\n    attrs: {\n        '.marker-target': { d: 'M 20 0 L 0 10 L 20 20 z', fill: 'white' },\n        '.connection': { 'stroke-dasharray': '3,3' }\n    }\n})\n\njoint.dia.Link.define('uml.Aggregation', {\n    attrs: { '.marker-target': { d: 'M 40 10 L 20 20 L 0 10 L 20 0 z', fill: 'white' }}\n})\n\njoint.dia.Link.define('uml.Composition', {\n    attrs: { '.marker-target': { d: 'M 40 10 L 20 20 L 0 10 L 20 0 z', fill: 'black' }}\n})\n\njoint.dia.Link.define('uml.Association')\n\n// Statechart\n\njoint.shapes.basic.Generic.define('uml.State', {\n    attrs: {\n        '.uml-state-body': {\n            width: 200, height: 200, rx: 10, ry: 10,\n            fill: '#ecf0f1', stroke: '#bdc3c7', 'stroke-width': 3\n        },\n        '.uml-state-separator': {\n            stroke: '#bdc3c7', 'stroke-width': 2\n        },\n        '.uml-state-name': {\n            ref: '.uml-state-body', 'ref-x': .5, 'ref-y': 5, 'text-anchor': 'middle',\n            fill: '#000000', 'font-family': 'Courier New', 'font-size': 14\n        },\n        '.uml-state-events': {\n            ref: '.uml-state-separator', 'ref-x': 5, 'ref-y': 5,\n            fill: '#000000', 'font-family': 'Courier New', 'font-size': 14\n        }\n    },\n\n    name: 'State',\n    events: []\n\n}, {\n    markup: [\n        '<g class=\"rotatable\">',\n        '<g class=\"scalable\">',\n        '<rect class=\"uml-state-body\"/>',\n        '</g>',\n        '<path class=\"uml-state-separator\"/>',\n        '<text class=\"uml-state-name\"/>',\n        '<text class=\"uml-state-events\"/>',\n        '</g>'\n    ].join(''),\n\n    initialize: function() {\n\n        this.on({\n            'change:name': this.updateName,\n            'change:events': this.updateEvents,\n            'change:size': this.updatePath\n        }, this)\n\n        this.updateName()\n        this.updateEvents()\n        this.updatePath()\n\n        joint.shapes.basic.Generic.prototype.initialize.apply(this, arguments)\n    },\n\n    updateName: function() {\n\n        this.attr('.uml-state-name/text', this.get('name'))\n    },\n\n    updateEvents: function() {\n\n        this.attr('.uml-state-events/text', this.get('events').join('\\n'))\n    },\n\n    updatePath: function() {\n\n        const d = `M 0 20 L ${  this.get('size').width  } 20`\n\n        // We are using `silent: true` here because updatePath() is meant to be called\n        // on resize and there's no need to to update the element twice (`change:size`\n        // triggers also an update).\n        this.attr('.uml-state-separator/d', d, { silent: true })\n    }\n})\n\njoint.shapes.basic.Circle.define('uml.StartState', {\n    type: 'uml.StartState',\n    attrs: { circle: { fill: '#34495e', stroke: '#2c3e50', 'stroke-width': 2, rx: 1 }}\n})\n\njoint.shapes.basic.Generic.define('uml.EndState', {\n    size: { width: 20, height: 20 },\n    attrs: {\n        'circle.outer': {\n            transform: 'translate(10, 10)',\n            r: 10,\n            fill: '#ffffff',\n            stroke: '#2c3e50'\n        },\n\n        'circle.inner': {\n            transform: 'translate(10, 10)',\n            r: 6,\n            fill: '#34495e'\n        }\n    }\n}, {\n    markup: '<g class=\"rotatable\"><g class=\"scalable\"><circle class=\"outer\"/><circle class=\"inner\"/></g></g>',\n})\n\njoint.dia.Link.define('uml.Transition', {\n    attrs: {\n        '.marker-target': { d: 'M 10 0 L 0 5 L 10 10 z', fill: '#34495e', stroke: '#2c3e50' },\n        '.connection': { stroke: '#2c3e50' }\n    }\n})\n\njoint.shapes.basic.Generic.define('logic.Gate', {\n    size: { width: 80, height: 40 },\n    attrs: {\n        '.': { magnet: false },\n        '.body': { width: 100, height: 50 },\n        circle: { r: 7, stroke: 'black', fill: 'transparent', 'stroke-width': 2 }\n    }\n}, {\n    operation: function() {\n        return true\n    }\n})\n\njoint.shapes.logic.Gate.define('logic.IO', {\n    size: { width: 60, height: 30 },\n    attrs: {\n        '.body': { fill: 'white', stroke: 'black', 'stroke-width': 2 },\n        '.wire': { ref: '.body', 'ref-y': .5, stroke: 'black' },\n        text: {\n            fill: 'black',\n            ref: '.body', 'ref-x': .5, 'ref-y': .5, 'y-alignment': 'middle',\n            'text-anchor': 'middle',\n            'font-weight': 'bold',\n            'font-variant': 'small-caps',\n            'text-transform': 'capitalize',\n            'font-size': '14px'\n        }\n    }\n}, {\n    markup: '<g class=\"rotatable\"><g class=\"scalable\"><rect class=\"body\"/></g><path class=\"wire\"/><circle/><text/></g>',\n})\n\njoint.shapes.logic.IO.define('logic.Input', {\n    attrs: {\n        '.wire': { 'ref-dx': 0, d: 'M 0 0 L 23 0' },\n        circle: { ref: '.body', 'ref-dx': 30, 'ref-y': 0.5, magnet: true, class: 'output', port: 'out' },\n        text: { text: 'input' }\n    }\n})\n\njoint.shapes.logic.IO.define('logic.Output', {\n    attrs: {\n        '.wire': { 'ref-x': 0, d: 'M 0 0 L -23 0' },\n        circle: { ref: '.body', 'ref-x': -30, 'ref-y': 0.5, magnet: 'passive', class: 'input', port: 'in' },\n        text: { text: 'output' }\n    }\n})\n\njoint.shapes.logic.Gate.define('logic.Gate11', {\n    attrs: {\n        '.input': { ref: '.body', 'ref-x': -2, 'ref-y': 0.5, magnet: 'passive', port: 'in' },\n        '.output': { ref: '.body', 'ref-dx': 2, 'ref-y': 0.5, magnet: true, port: 'out' }\n    }\n}, {\n    markup: '<g class=\"rotatable\"><g class=\"scalable\"><image class=\"body\"/></g><circle class=\"input\"/><circle class=\"output\"/></g>',\n})\n\njoint.shapes.logic.Gate.define('logic.Gate21', {\n    attrs: {\n        '.input1': { ref: '.body', 'ref-x': -2, 'ref-y': 0.3, magnet: 'passive', port: 'in1' },\n        '.input2': { ref: '.body', 'ref-x': -2, 'ref-y': 0.7, magnet: 'passive', port: 'in2' },\n        '.output': { ref: '.body', 'ref-dx': 2, 'ref-y': 0.5, magnet: true, port: 'out' }\n    }\n}, {\n    markup: '<g class=\"rotatable\"><g class=\"scalable\"><image class=\"body\"/></g><circle class=\"input input1\"/><circle  class=\"input input2\"/><circle class=\"output\"/></g>',\n})\n\njoint.shapes.logic.Gate11.define('logic.Repeater', {\n    attrs: { image: { 'xlink:href': 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' }}\n}, {\n    operation: function(input) {\n        return input\n    }\n})\n\njoint.shapes.logic.Gate11.define('logic.Not', {\n    attrs: { image: { 'xlink:href': 'data:image/svg+xml;base64,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' }}\n}, {\n    operation: function(input) {\n        return !input\n    }\n})\n\njoint.shapes.logic.Gate21.define('logic.Or', {\n    attrs: { image: { 'xlink:href': 'data:image/svg+xml;base64,PD94bWwgdmVyc2lvbj0iMS4wIiBlbmNvZGluZz0iVVRGLTgiIHN0YW5kYWxvbmU9Im5vIj8+CjwhLS0gQ3JlYXRlZCB3aXRoIElua3NjYXBlIChodHRwOi8vd3d3Lmlua3NjYXBlLm9yZy8pIC0tPgo8c3ZnCiAgIHhtbG5zOmRjPSJodHRwOi8vcHVybC5vcmcvZGMvZWxlbWVudHMvMS4xLyIKICAgeG1sbnM6Y2M9Imh0dHA6Ly9jcmVhdGl2ZWNvbW1vbnMub3JnL25zIyIKICAgeG1sbnM6cmRmPSJodHRwOi8vd3d3LnczLm9yZy8xOTk5LzAyLzIyLXJkZi1zeW50YXgtbnMjIgogICB4bWxuczpzdmc9Imh0dHA6Ly93d3cudzMub3JnLzIwMDAvc3ZnIgogICB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciCiAgIHhtbG5zOnNvZGlwb2RpPSJodHRwOi8vc29kaXBvZGkuc291cmNlZm9yZ2UubmV0L0RURC9zb2RpcG9kaS0wLmR0ZCIKICAgeG1sbnM6aW5rc2NhcGU9Imh0dHA6Ly93d3cuaW5rc2NhcGUub3JnL25hbWVzcGFjZXMvaW5rc2NhcGUiCiAgIHdpZHRoPSIxMDAiCiAgIGhlaWdodD0iNTAiCiAgIGlkPSJzdmcyIgogICBzb2RpcG9kaTp2ZXJzaW9uPSIwLjMyIgogICBpbmtzY2FwZTp2ZXJzaW9uPSIwLjQ2IgogICB2ZXJzaW9uPSIxLjAiCiAgIHNvZGlwb2RpOmRvY25hbWU9Ik9SIEFOU0kuc3ZnIgogICBpbmtzY2FwZTpvdXRwdXRfZXh0ZW5zaW9uPSJvcmcuaW5rc2NhcGUub3V0cHV0LnN2Zy5pbmtzY2FwZSI+CiAgPGRlZnMKICAgICBpZD0iZGVmczQiPgogICAgPGlua3NjYXBlOnBlcnNwZWN0aXZlCiAgICAgICBzb2RpcG9kaTp0eXBlPSJpbmtzY2FwZTpwZXJzcDNkIgogICAgICAgaW5rc2NhcGU6dnBfeD0iMCA6IDE1IDogMSIKICAgICAgIGlua3NjYXBlOnZwX3k9IjAgOiAxMDAwIDogMCIKICAgICAgIGlua3NjYXBlOnZwX3o9IjUwIDogMTUgOiAxIgogICAgICAgaW5rc2NhcGU6cGVyc3AzZC1vcmlnaW49IjI1IDogMTAgOiAxIgogICAgICAgaWQ9InBlcnNwZWN0aXZlMjcxNCIgLz4KICAgIDxpbmtzY2FwZTpwZXJzcGVjdGl2ZQogICAgICAgc29kaXBvZGk6dHlwZT0iaW5rc2NhcGU6cGVyc3AzZCIKICAgICAgIGlua3NjYXBlOnZwX3g9IjAgOiAwLjUgOiAxIgogICAgICAgaW5rc2NhcGU6dnBfeT0iMCA6IDEwMDAgOiAwIgogICAgICAgaW5rc2NhcGU6dnBfej0iMSA6IDAuNSA6IDEiCiAgICAgICBpbmtzY2FwZTpwZXJzcDNkLW9yaWdpbj0iMC41IDogMC4zMzMzMzMzMyA6IDEiCiAgICAgICBpZD0icGVyc3BlY3RpdmUyODA2IiAvPgogICAgPGlua3NjYXBlOnBlcnNwZWN0aXZlCiAgICAgICBpZD0icGVyc3BlY3RpdmUyODE5IgogICAgICAgaW5rc2NhcGU6cGVyc3AzZC1vcmlnaW49IjM3Mi4wNDcyNCA6IDM1MC43ODczOSA6IDEiCiAgICAgICBpbmtzY2FwZTp2cF96PSI3NDQuMDk0NDggOiA1MjYuMTgxMDkgOiAxIgogICAgICAgaW5rc2NhcGU6dnBfeT0iMCA6IDEwMDAgOiAwIgogICAgICAgaW5rc2NhcGU6dnBfeD0iMCA6IDUyNi4xODEwOSA6IDEiCiAgICAgICBzb2RpcG9kaTp0eXBlPSJpbmtzY2FwZTpwZXJzcDNkIiAvPgogICAgPGlua3NjYXBlOnBlcnNwZWN0aXZlCiAgICAgICBpZD0icGVyc3BlY3RpdmUyNzc3IgogICAgICAgaW5rc2NhcGU6cGVyc3AzZC1vcmlnaW49Ijc1IDogNDAgOiAxIgogICAgICAgaW5rc2NhcGU6dnBfej0iMTUwIDogNjAgOiAxIgogICAgICAgaW5rc2NhcGU6dnBfeT0iMCA6IDEwMDAgOiAwIgogICAgICAgaW5rc2NhcGU6dnBfeD0iMCA6IDYwIDogMSIKICAgICAgIHNvZGlwb2RpOnR5cGU9Imlua3NjYXBlOnBlcnNwM2QiIC8+CiAgICA8aW5rc2NhcGU6cGVyc3BlY3RpdmUKICAgICAgIGlkPSJwZXJzcGVjdGl2ZTMyNzUiCiAgICAgICBpbmtzY2FwZTpwZXJzcDNkLW9yaWdpbj0iNTAgOiAzMy4zMzMzMzMgOiAxIgogICAgICAgaW5rc2NhcGU6dnBfej0iMTAwIDogNTAgOiAxIgogICAgICAgaW5rc2NhcGU6dnBfeT0iMCA6IDEwMDAgOiAwIgogICAgICAgaW5rc2NhcGU6dnBfeD0iMCA6IDUwIDogMSIKICAgICAgIHNvZGlwb2RpOnR5cGU9Imlua3NjYXBlOnBlcnNwM2QiIC8+CiAgICA8aW5rc2NhcGU6cGVyc3BlY3RpdmUKICAgICAgIGlkPSJwZXJzcGVjdGl2ZTU1MzMiCiAgICAgICBpbmtzY2FwZTpwZXJzcDNkLW9yaWdpbj0iMzIgOiAyMS4zMzMzMzMgOiAxIgogICAgICAgaW5rc2NhcGU6dnBfej0iNjQgOiAzMiA6IDEiCiAgICAgICBpbmtzY2FwZTp2cF95PSIwIDogMTAwMCA6IDAiCiAgICAgICBpbmtzY2FwZTp2cF94PSIwIDogMzIgOiAxIgogICAgICAgc29kaXBvZGk6dHlwZT0iaW5rc2NhcGU6cGVyc3AzZCIgLz4KICAgIDxpbmtzY2FwZTpwZXJzcGVjdGl2ZQogICAgICAgaWQ9InBlcnNwZWN0aXZlMjU1NyIKICAgICAgIGlua3NjYXBlOnBlcnNwM2Qtb3JpZ2luPSIyNSA6IDE2LjY2NjY2NyA6IDEiCiAgICAgICBpbmtzY2FwZTp2cF96PSI1MCA6IDI1IDogMSIKICAgICAgIGlua3NjYXBlOnZwX3k9IjAgOiAxMDAwIDogMCIKICAgICAgIGlua3NjYXBlOnZwX3g9IjAgOiAyNSA6IDEiCiAgICAgICBzb2RpcG9kaTp0eXBlPSJpbmtzY2FwZTpwZXJzcDNkIiAvPgogIDwvZGVmcz4KICA8c29kaXBvZGk6bmFtZWR2aWV3CiAgICAgaWQ9ImJhc2UiCiAgICAgcGFnZWNvbG9yPSIjZmZmZmZmIgogICAgIGJvcmRlcmNvbG9yPSIjNjY2NjY2IgogICAgIGJvcmRlcm9wYWNpdHk9IjEuMCIKICAgICBpbmtzY2FwZTpwYWdlb3BhY2l0eT0iMC4wIgogICAgIGlua3NjYXBlOnBhZ2VzaGFkb3c9IjIiCiAgICAgaW5rc2NhcGU6em9vbT0iNCIKICAgICBpbmtzY2FwZTpjeD0iMTEzLjAwMDM5IgogICAgIGlua3NjYXBlOmN5PSIxMi44OTM3MzEiCiAgICAgaW5rc2NhcGU6ZG9jdW1lbnQtdW5pdHM9InB4IgogICAgIGlua3NjYXBlOmN1cnJlbnQtbGF5ZXI9ImcyNTYwIgogICAgIHNob3dncmlkPSJmYWxzZSIKICAgICBpbmtzY2FwZTpncmlkLWJib3g9InRydWUiCiAgICAgaW5rc2NhcGU6Z3JpZC1wb2ludHM9InRydWUiCiAgICAgZ3JpZHRvbGVyYW5jZT0iMTAwMDAiCiAgICAgaW5rc2NhcGU6d2luZG93LXdpZHRoPSIxMzk5IgogICAgIGlua3NjYXBlOndpbmRvdy1oZWlnaHQ9Ijg3NCIKICAgICBpbmtzY2FwZTp3aW5kb3cteD0iMzciCiAgICAgaW5rc2NhcGU6d2luZG93LXk9Ii00IgogICAgIGlua3NjYXBlOnNuYXAtYmJveD0idHJ1ZSI+CiAgICA8aW5rc2NhcGU6Z3JpZAogICAgICAgaWQ9IkdyaWRGcm9tUHJlMDQ2U2V0dGluZ3MiCiAgICAgICB0eXBlPSJ4eWdyaWQiCiAgICAgICBvcmlnaW54PSIwcHgiCiAgICAgICBvcmlnaW55PSIwcHgiCiAgICAgICBzcGFjaW5neD0iMXB4IgogICAgICAgc3BhY2luZ3k9IjFweCIKICAgICAgIGNvbG9yPSIjMDAwMGZmIgogICAgICAgZW1wY29sb3I9IiMwMDAwZmYiCiAgICAgICBvcGFjaXR5PSIwLjIiCiAgICAgICBlbXBvcGFjaXR5PSIwLjQiCiAgICAgICBlbXBzcGFjaW5nPSI1IgogICAgICAgdmlzaWJsZT0idHJ1ZSIKICAgICAgIGVuYWJsZWQ9InRydWUiIC8+CiAgPC9zb2RpcG9kaTpuYW1lZHZpZXc+CiAgPG1ldGFkYXRhCiAgICAgaWQ9Im1ldGFkYXRhNyI+CiAgICA8cmRmOlJERj4KICAgICAgPGNjOldvcmsKICAgICAgICAgcmRmOmFib3V0PSIiPgogICAgICAgIDxkYzpmb3JtYXQ+aW1hZ2Uvc3ZnK3htbDwvZGM6Zm9ybWF0PgogICAgICAgIDxkYzp0eXBlCiAgICAgICAgICAgcmRmOnJlc291cmNlPSJodHRwOi8vcHVybC5vcmcvZGMvZGNtaXR5cGUvU3RpbGxJbWFnZSIgLz4KICAgICAgPC9jYzpXb3JrPgogICAgPC9yZGY6UkRGPgogIDwvbWV0YWRhdGE+CiAgPGcKICAgICBpbmtzY2FwZTpsYWJlbD0iTGF5ZXIgMSIKICAgICBpbmtzY2FwZTpncm91cG1vZGU9ImxheWVyIgogICAgIGlkPSJsYXllcjEiPgogICAgPHBhdGgKICAgICAgIHN0eWxlPSJmaWxsOm5vbmU7c3Ryb2tlOiMwMDAwMDA7c3Ryb2tlLXdpZHRoOjI7c3Ryb2tlLWxpbmVjYXA6YnV0dDtzdHJva2UtbGluZWpvaW46bWl0ZXI7c3Ryb2tlLW9wYWNpdHk6MSIKICAgICAgIGQ9Im0gNzAsMjUgYyAyMCwwIDI1LDAgMjUsMCIKICAgICAgIGlkPSJwYXRoMzA1OSIKICAgICAgIHNvZGlwb2RpOm5vZGV0eXBlcz0iY2MiIC8+CiAgICA8cGF0aAogICAgICAgc3R5bGU9ImZpbGw6bm9uZTtzdHJva2U6IzAwMDAwMDtzdHJva2Utd2lkdGg6MjtzdHJva2UtbGluZWNhcDpidXR0O3N0cm9rZS1saW5lam9pbjptaXRlcjtzdHJva2Utb3BhY2l0eToxIgogICAgICAgZD0iTSAzMSwxNSA1LDE1IgogICAgICAgaWQ9InBhdGgzMDYxIiAvPgogICAgPHBhdGgKICAgICAgIHN0eWxlPSJmaWxsOm5vbmU7c3Ryb2tlOiMwMDAwMDA7c3Ryb2tlLXdpZHRoOjEuOTk5OTk5ODg7c3Ryb2tlLWxpbmVjYXA6YnV0dDtzdHJva2UtbGluZWpvaW46bWl0ZXI7c3Ryb2tlLW9wYWNpdHk6MSIKICAgICAgIGQ9Ik0gMzIsMzUgNSwzNSIKICAgICAgIGlkPSJwYXRoMzk0NCIgLz4KICAgIDxnCiAgICAgICBpZD0iZzI1NjAiCiAgICAgICBpbmtzY2FwZTpsYWJlbD0iTGF5ZXIgMSIKICAgICAgIHRyYW5zZm9ybT0idHJhbnNsYXRlKDI2LjUsLTM5LjUpIj4KICAgICAgPHBhdGgKICAgICAgICAgc3R5bGU9ImZpbGw6IzAwMDAwMDtmaWxsLW9wYWNpdHk6MTtmaWxsLXJ1bGU6ZXZlbm9kZDtzdHJva2U6bm9uZTtzdHJva2Utd2lkdGg6MztzdHJva2UtbGluZWNhcDpidXR0O3N0cm9rZS1saW5lam9pbjptaXRlcjtzdHJva2Utb3BhY2l0eToxIgogICAgICAgICBkPSJNIC0yLjQwNjI1LDQ0LjUgTCAtMC40MDYyNSw0Ni45Mzc1IEMgLTAuNDA2MjUsNDYuOTM3NSA1LjI1LDUzLjkzNzU0OSA1LjI1LDY0LjUgQyA1LjI1LDc1LjA2MjQ1MSAtMC40MDYyNSw4Mi4wNjI1IC0wLjQwNjI1LDgyLjA2MjUgTCAtMi40MDYyNSw4NC41IEwgMC43NSw4NC41IEwgMTQuNzUsODQuNSBDIDE3LjE1ODA3Niw4NC41MDAwMDEgMjIuNDM5Njk5LDg0LjUyNDUxNCAyOC4zNzUsODIuMDkzNzUgQyAzNC4zMTAzMDEsNzkuNjYyOTg2IDQwLjkxMTUzNiw3NC43NTA0ODQgNDYuMDYyNSw2NS4yMTg3NSBMIDQ0Ljc1LDY0LjUgTCA0Ni4wNjI1LDYzLjc4MTI1IEMgMzUuNzU5Mzg3LDQ0LjcxNTU5IDE5LjUwNjU3NCw0NC41IDE0Ljc1LDQ0LjUgTCAwLjc1LDQ0LjUgTCAtMi40MDYyNSw0NC41IHogTSAzLjQ2ODc1LDQ3LjUgTCAxNC43NSw0Ny41IEMgMTkuNDM0MTczLDQ3LjUgMzMuMDM2ODUsNDcuMzY5NzkzIDQyLjcxODc1LDY0LjUgQyAzNy45NTE5NjQsNzIuOTI5MDc1IDMyLjE5NzQ2OSw3Ny4xODM5MSAyNyw3OS4zMTI1IEMgMjEuNjM5MzM5LDgxLjUwNzkyNCAxNy4xNTgwNzUsODEuNTAwMDAxIDE0Ljc1LDgxLjUgTCAzLjUsODEuNSBDIDUuMzczNTg4NCw3OC4zOTE1NjYgOC4yNSw3Mi40NTA2NSA4LjI1LDY0LjUgQyA4LjI1LDU2LjUyNjY0NiA1LjM0MTQ2ODYsNTAuNTk5ODE1IDMuNDY4NzUsNDcuNSB6IgogICAgICAgICBpZD0icGF0aDQ5NzMiCiAgICAgICAgIHNvZGlwb2RpOm5vZGV0eXBlcz0iY2NzY2NjY3NjY2NjY2NjY2NzY2NzYyIgLz4KICAgIDwvZz4KICA8L2c+Cjwvc3ZnPgo=' }}\n}, {\n    operation: function(input1, input2) {\n        return input1 || input2\n    }\n})\n\njoint.shapes.logic.Gate21.define('logic.And', {\n    attrs: { image: { 'xlink:href': 'data:image/svg+xml;base64,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' }}\n\n}, {\n    operation: function(input1, input2) {\n        return input1 && input2\n    }\n})\n\njoint.shapes.logic.Gate21.define('logic.Nor', {\n    attrs: { image: { 'xlink:href': 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}}\n}, {\n    operation: function(input1, input2) {\n        return !(input1 || input2)\n    }\n})\n\njoint.shapes.logic.Gate21.define('logic.Nand', {\n    attrs: { image: { 'xlink:href': 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Higher weight edges are generally\n            // made shorter and straighter than lower weight edges.\n            weight: link.get('weight') || 1,\n            // Where to place the label relative to the edge.\n            // l = left, c = center r = right.\n            labelpos: link.get('labelPosition') || 'c',\n            // How many pixels to move the label away from the edge.\n            // Applies only when labelpos is l or r.\n            labeloffset: link.get('labelOffset') || 0,\n            // The width of the edge label in pixels.\n            width: labelSize.width || 0,\n            // The height of the edge label in pixels.\n            height: labelSize.height || 0\n        }\n\n        return edge\n    },\n\n    importElement: function(opt, v, gl) {\n\n        const element = this.getCell(v)\n        const glNode = gl.node(v)\n\n        if (opt.setPosition) {\n            opt.setPosition(element, glNode)\n        } else {\n            element.set('position', {\n                x: glNode.x - glNode.width / 2,\n                y: glNode.y - glNode.height / 2\n            })\n        }\n    },\n\n    importLink: function(opt, edgeObj, gl) {\n\n        const link = this.getCell(edgeObj.name)\n        const glEdge = gl.edge(edgeObj)\n        const points = glEdge.points || []\n\n        // check the `setLinkVertices` here for backwards compatibility\n        if (opt.setVertices || opt.setLinkVertices) {\n            if (joint.util.isFunction(opt.setVertices)) {\n                opt.setVertices(link, points)\n            } else {\n                // Remove the first and last point from points array.\n                // Those are source/target element connection points\n                // ie. they lies on the edge of connected elements.\n                link.set('vertices', points.slice(1, points.length - 1))\n            }\n        }\n\n        if (opt.setLabels && ('x' in glEdge) && ('y' in glEdge)) {\n            const labelPosition = { x: glEdge.x, y: glEdge.y }\n            if (joint.util.isFunction(opt.setLabels)) {\n                opt.setLabels(link, labelPosition, points)\n            } else {\n                // Convert the absolute label position to a relative position\n                // towards the closest point on the edge\n                const polyline = g.Polyline(points)\n                const length = polyline.closestPointLength(labelPosition)\n                const closestPoint = polyline.pointAtLength(length)\n                const distance = length / polyline.length()\n                link.label(0, {\n                    position: {\n                        distance: distance,\n                        offset: g.Point(labelPosition).difference(closestPoint).toJSON()\n                    }\n                })\n            }\n        }\n    },\n\n    layout: function(graphOrCells, opt) {\n\n        let graph\n\n        if (graphOrCells instanceof joint.dia.Graph) {\n            graph = graphOrCells\n        } else {\n            // Reset cells in dry mode so the graph reference is not stored on the cells.\n            // `sort: false` to prevent elements to change their order based on the z-index\n            graph = (new joint.dia.Graph()).resetCells(graphOrCells, { dry: true, sort: false })\n        }\n\n        // This is not needed anymore.\n        graphOrCells = null\n\n        opt = joint.util.defaults(opt || {}, {\n            resizeClusters: true,\n            clusterPadding: 10,\n            exportElement: this.exportElement,\n            exportLink: this.exportLink\n        })\n\n        // create a graphlib.Graph that represents the joint.dia.Graph\n        const glGraph = graph.toGraphLib({\n            directed: true,\n            // We are about to use edge naming feature.\n            multigraph: true,\n            // We are able to layout graphs with embeds.\n            compound: true,\n            setNodeLabel: opt.exportElement,\n            setEdgeLabel: opt.exportLink,\n            setEdgeName: function(link) {\n                // Graphlib edges have no ids. We use edge name property\n                // to store and retrieve ids instead.\n                return link.id\n            }\n        })\n\n        const glLabel = {}\n        const marginX = opt.marginX || 0\n        const marginY = opt.marginY || 0\n\n        // Dagre layout accepts options as lower case.\n        // Direction for rank nodes. Can be TB, BT, LR, or RL\n        if (opt.rankDir) glLabel.rankdir = opt.rankDir\n        // Alignment for rank nodes. Can be UL, UR, DL, or DR\n        if (opt.align) glLabel.align = opt.align\n        // Number of pixels that separate nodes horizontally in the layout.\n        if (opt.nodeSep) glLabel.nodesep = opt.nodeSep\n        // Number of pixels that separate edges horizontally in the layout.\n        if (opt.edgeSep) glLabel.edgesep = opt.edgeSep\n        // Number of pixels between each rank in the layout.\n        if (opt.rankSep) glLabel.ranksep = opt.rankSep\n        // Type of algorithm to assign a rank to each node in the input graph.\n        // Possible values: network-simplex, tight-tree or longest-path\n        if (opt.ranker) glLabel.ranker = opt.ranker\n        // Number of pixels to use as a margin around the left and right of the graph.\n        if (marginX) glLabel.marginx = marginX\n        // Number of pixels to use as a margin around the top and bottom of the graph.\n        if (marginY) glLabel.marginy = marginY\n\n        // Set the option object for the graph label.\n        glGraph.setGraph(glLabel)\n\n        // Executes the layout.\n        dagre.layout(glGraph, { debugTiming: !!opt.debugTiming })\n\n        // Wrap all graph changes into a batch.\n        graph.startBatch('layout')\n\n        // Update the graph.\n        graph.fromGraphLib(glGraph, {\n            importNode: this.importElement.bind(graph, opt),\n            importEdge: this.importLink.bind(graph, opt)\n        })\n\n        if (opt.resizeClusters) {\n            // Resize and reposition cluster elements (parents of other elements)\n            // to fit their children.\n            // 1. filter clusters only\n            // 2. map id on cells\n            // 3. sort cells by their depth (the deepest first)\n            // 4. resize cell to fit their direct children only.\n            const clusters = glGraph.nodes()\n                .filter(function(v) { return glGraph.children(v).length > 0 })\n                .map(graph.getCell.bind(graph))\n                .sort(function(aCluster, bCluster) {\n                    return bCluster.getAncestors().length - aCluster.getAncestors().length\n                })\n\n            joint.util.invoke(clusters, 'fitEmbeds', { padding: opt.clusterPadding })\n        }\n\n        graph.stopBatch('layout')\n\n        // Width and height of the graph extended by margins.\n        const glSize = glGraph.graph()\n        // Return the bounding box of the graph after the layout.\n        return g.Rect(\n            marginX,\n            marginY,\n            Math.abs(glSize.width - 2 * marginX),\n            Math.abs(glSize.height - 2 * marginY)\n        )\n    },\n\n    fromGraphLib: function(glGraph, opt) {\n\n        opt = opt || {}\n\n        const importNode = opt.importNode || joint.util.noop\n        const importEdge = opt.importEdge || joint.util.noop\n        const graph = (this instanceof joint.dia.Graph) ? this : new joint.dia.Graph\n\n        // Import all nodes.\n        glGraph.nodes().forEach(function(node) {\n            importNode.call(graph, node, glGraph, graph, opt)\n        })\n\n        // Import all edges.\n        glGraph.edges().forEach(function(edge) {\n            importEdge.call(graph, edge, glGraph, graph, opt)\n        })\n\n        return graph\n    },\n\n    // Create new graphlib graph from existing JointJS graph.\n    toGraphLib: function(graph, opt) {\n\n        opt = opt || {}\n\n        const glGraphType = joint.util.pick(opt, 'directed', 'compound', 'multigraph')\n        const glGraph = new graphlib.Graph(glGraphType)\n        const setNodeLabel = opt.setNodeLabel || joint.util.noop\n        const setEdgeLabel = opt.setEdgeLabel || joint.util.noop\n        const setEdgeName = opt.setEdgeName || joint.util.noop\n        const collection = graph.get('cells')\n\n        for (let i = 0, n = collection.length; i < n; i++) {\n\n            const cell = collection.at(i)\n            if (cell.isLink()) {\n\n                const source = cell.get('source')\n                const target = cell.get('target')\n\n                // Links that end at a point are ignored.\n                if (!source.id || !target.id) break\n\n                // Note that if we are creating a multigraph we can name the edges. If\n                // we try to name edges on a non-multigraph an exception is thrown.\n                glGraph.setEdge(source.id, target.id, setEdgeLabel(cell), setEdgeName(cell))\n\n            } else {\n\n                glGraph.setNode(cell.id, setNodeLabel(cell))\n\n                // For the compound graphs we have to take embeds into account.\n                if (glGraph.isCompound() && cell.has('parent')) {\n                    const parentId = cell.get('parent')\n                    if (collection.has(parentId)) {\n                        // Make sure the parent cell is included in the graph (this can\n                        // happen when the layout is run on part of the graph only).\n                        glGraph.setParent(cell.id, parentId)\n                    }\n                }\n            }\n        }\n\n        return glGraph\n    }\n}\n\njoint.dia.Graph.prototype.toGraphLib = function(opt) {\n\n    return joint.layout.DirectedGraph.toGraphLib(this, opt)\n}\n\njoint.dia.Graph.prototype.fromGraphLib = function(glGraph, opt) {\n\n    return joint.layout.DirectedGraph.fromGraphLib.call(this, glGraph, opt)\n};\n\n/**\n * Copyright 2015 The Chromium Authors. All rights reserved.\n *\n * The Chromium Authors can be found at\n * http://src.chromium.org/svn/trunk/src/AUTHORS\n *\n * Redistribution and use in source and binary forms, with or without\n * modification, are permitted provided that the following conditions are\n * met:\n *\n *    * Redistributions of source code must retain the above copyright\n * notice, this list of conditions and the following disclaimer.\n *    * Redistributions in binary form must reproduce the above\n * copyright notice, this list of conditions and the following disclaimer\n * in the documentation and/or other materials provided with the\n * distribution.\n *    * Neither the name of Google Inc. nor the names of its\n * contributors may be used to endorse or promote products derived from\n * this software without specific prior written permission.\n\n * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS\n * \"AS IS\" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT\n * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR\n * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT\n * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,\n * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT\n * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,\n * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY\n * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT\n * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE\n * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.\n */\n\n// SVGPathSeg API polyfill\n// https://github.com/progers/pathseg\n//\n// This is a drop-in replacement for the SVGPathSeg and SVGPathSegList APIs that were removed from\n// SVG2 (https://lists.w3.org/Archives/Public/www-svg/2015Jun/0044.html), including the latest spec\n// changes which were implemented in Firefox 43 and Chrome 46.\n\n(function() { \n    if (typeof window !== 'undefined' && !(\"SVGPathSeg\" in window)) {\n        // Spec: http://www.w3.org/TR/SVG11/single-page.html#paths-InterfaceSVGPathSeg\n        window.SVGPathSeg = function(type, typeAsLetter, owningPathSegList) {\n            this.pathSegType = type\n            this.pathSegTypeAsLetter = typeAsLetter\n            this._owningPathSegList = owningPathSegList\n        }\n\n        window.SVGPathSeg.prototype.classname = \"SVGPathSeg\"\n\n        window.SVGPathSeg.PATHSEG_UNKNOWN = 0\n        window.SVGPathSeg.PATHSEG_CLOSEPATH = 1\n        window.SVGPathSeg.PATHSEG_MOVETO_ABS = 2\n        window.SVGPathSeg.PATHSEG_MOVETO_REL = 3\n        window.SVGPathSeg.PATHSEG_LINETO_ABS = 4\n        window.SVGPathSeg.PATHSEG_LINETO_REL = 5\n        window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_ABS = 6\n        window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_REL = 7\n        window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_ABS = 8\n        window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_REL = 9\n        window.SVGPathSeg.PATHSEG_ARC_ABS = 10\n        window.SVGPathSeg.PATHSEG_ARC_REL = 11\n        window.SVGPathSeg.PATHSEG_LINETO_HORIZONTAL_ABS = 12\n        window.SVGPathSeg.PATHSEG_LINETO_HORIZONTAL_REL = 13\n        window.SVGPathSeg.PATHSEG_LINETO_VERTICAL_ABS = 14\n        window.SVGPathSeg.PATHSEG_LINETO_VERTICAL_REL = 15\n        window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_SMOOTH_ABS = 16\n        window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_SMOOTH_REL = 17\n        window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_SMOOTH_ABS = 18\n        window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_SMOOTH_REL = 19\n\n        // Notify owning PathSegList on any changes so they can be synchronized back to the path element.\n        window.SVGPathSeg.prototype._segmentChanged = function() {\n            if (this._owningPathSegList)\n                this._owningPathSegList.segmentChanged(this)\n        }\n\n        window.SVGPathSegClosePath = function(owningPathSegList) {\n            window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_CLOSEPATH, \"z\", owningPathSegList)\n        }\n        window.SVGPathSegClosePath.prototype = Object.create(window.SVGPathSeg.prototype)\n        window.SVGPathSegClosePath.prototype.toString = function() { return \"[object SVGPathSegClosePath]\" }\n        window.SVGPathSegClosePath.prototype._asPathString = function() { return this.pathSegTypeAsLetter }\n        window.SVGPathSegClosePath.prototype.clone = function() { return new window.SVGPathSegClosePath(undefined) }\n\n        window.SVGPathSegMovetoAbs = function(owningPathSegList, x, y) {\n            window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_MOVETO_ABS, \"M\", owningPathSegList)\n            this._x = x\n            this._y = y\n        }\n        window.SVGPathSegMovetoAbs.prototype = Object.create(window.SVGPathSeg.prototype)\n        window.SVGPathSegMovetoAbs.prototype.toString = function() { return \"[object SVGPathSegMovetoAbs]\" }\n        window.SVGPathSegMovetoAbs.prototype._asPathString = function() { return `${this.pathSegTypeAsLetter  } ${  this._x  } ${  this._y}` }\n        window.SVGPathSegMovetoAbs.prototype.clone = function() { return new window.SVGPathSegMovetoAbs(undefined, this._x, this._y) }\n        Object.defineProperty(window.SVGPathSegMovetoAbs.prototype, \"x\", { get: function() { return this._x }, set: function(x) { this._x = x; this._segmentChanged() }, enumerable: true })\n        Object.defineProperty(window.SVGPathSegMovetoAbs.prototype, \"y\", { get: function() { return this._y }, set: function(y) { this._y = y; this._segmentChanged() }, enumerable: true })\n\n        window.SVGPathSegMovetoRel = function(owningPathSegList, x, y) {\n            window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_MOVETO_REL, \"m\", owningPathSegList)\n            this._x = x\n            this._y = y\n        }\n        window.SVGPathSegMovetoRel.prototype = Object.create(window.SVGPathSeg.prototype)\n        window.SVGPathSegMovetoRel.prototype.toString = function() { return \"[object SVGPathSegMovetoRel]\" }\n        window.SVGPathSegMovetoRel.prototype._asPathString = function() { return `${this.pathSegTypeAsLetter  } ${  this._x  } ${  this._y}` }\n        window.SVGPathSegMovetoRel.prototype.clone = function() { return new window.SVGPathSegMovetoRel(undefined, this._x, this._y) }\n        Object.defineProperty(window.SVGPathSegMovetoRel.prototype, \"x\", { get: function() { return this._x }, set: function(x) { this._x = x; this._segmentChanged() }, enumerable: true })\n        Object.defineProperty(window.SVGPathSegMovetoRel.prototype, \"y\", { get: function() { return this._y }, set: function(y) { this._y = y; this._segmentChanged() }, enumerable: true })\n\n        window.SVGPathSegLinetoAbs = function(owningPathSegList, x, y) {\n            window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_LINETO_ABS, \"L\", owningPathSegList)\n            this._x = x\n            this._y = y\n        }\n        window.SVGPathSegLinetoAbs.prototype = Object.create(window.SVGPathSeg.prototype)\n        window.SVGPathSegLinetoAbs.prototype.toString = function() { return \"[object SVGPathSegLinetoAbs]\" }\n        window.SVGPathSegLinetoAbs.prototype._asPathString = function() { return `${this.pathSegTypeAsLetter  } ${  this._x  } ${  this._y}` }\n        window.SVGPathSegLinetoAbs.prototype.clone = function() { return new window.SVGPathSegLinetoAbs(undefined, this._x, this._y) }\n        Object.defineProperty(window.SVGPathSegLinetoAbs.prototype, \"x\", { get: function() { return this._x }, set: function(x) { this._x = x; this._segmentChanged() }, enumerable: true })\n        Object.defineProperty(window.SVGPathSegLinetoAbs.prototype, \"y\", { get: function() { return this._y }, set: function(y) { this._y = y; this._segmentChanged() }, enumerable: true })\n\n        window.SVGPathSegLinetoRel = function(owningPathSegList, x, y) {\n            window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_LINETO_REL, \"l\", owningPathSegList)\n            this._x = x\n            this._y = y\n        }\n        window.SVGPathSegLinetoRel.prototype = Object.create(window.SVGPathSeg.prototype)\n        window.SVGPathSegLinetoRel.prototype.toString = function() { return \"[object SVGPathSegLinetoRel]\" }\n        window.SVGPathSegLinetoRel.prototype._asPathString = function() { return `${this.pathSegTypeAsLetter  } ${  this._x  } ${  this._y}` }\n        window.SVGPathSegLinetoRel.prototype.clone = function() { return new window.SVGPathSegLinetoRel(undefined, this._x, this._y) }\n        Object.defineProperty(window.SVGPathSegLinetoRel.prototype, \"x\", { get: function() { return this._x }, set: function(x) { this._x = x; this._segmentChanged() }, enumerable: true })\n        Object.defineProperty(window.SVGPathSegLinetoRel.prototype, \"y\", { get: function() { return this._y }, set: function(y) { this._y = y; this._segmentChanged() }, enumerable: true })\n\n        window.SVGPathSegCurvetoCubicAbs = function(owningPathSegList, x, y, x1, y1, x2, y2) {\n            window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_ABS, \"C\", owningPathSegList)\n            this._x = x\n            this._y = y\n            this._x1 = x1\n            this._y1 = y1\n            this._x2 = x2\n            this._y2 = y2\n        }\n        window.SVGPathSegCurvetoCubicAbs.prototype = Object.create(window.SVGPathSeg.prototype)\n        window.SVGPathSegCurvetoCubicAbs.prototype.toString = function() { return \"[object SVGPathSegCurvetoCubicAbs]\" }\n        window.SVGPathSegCurvetoCubicAbs.prototype._asPathString = function() { return `${this.pathSegTypeAsLetter  } ${  this._x1  } ${  this._y1  } ${  this._x2  } ${  this._y2  } ${  this._x  } ${  this._y}` }\n        window.SVGPathSegCurvetoCubicAbs.prototype.clone = function() { return new window.SVGPathSegCurvetoCubicAbs(undefined, this._x, this._y, this._x1, this._y1, this._x2, this._y2) }\n        Object.defineProperty(window.SVGPathSegCurvetoCubicAbs.prototype, \"x\", { get: function() { return this._x }, set: function(x) { this._x = x; this._segmentChanged() }, enumerable: true })\n        Object.defineProperty(window.SVGPathSegCurvetoCubicAbs.prototype, \"y\", { get: function() { return this._y }, set: function(y) { this._y = y; this._segmentChanged() }, enumerable: true })\n        Object.defineProperty(window.SVGPathSegCurvetoCubicAbs.prototype, \"x1\", { get: function() { return this._x1 }, set: function(x1) { this._x1 = x1; this._segmentChanged() }, enumerable: true })\n        Object.defineProperty(window.SVGPathSegCurvetoCubicAbs.prototype, \"y1\", { get: function() { return this._y1 }, set: function(y1) { this._y1 = y1; this._segmentChanged() }, enumerable: true })\n        Object.defineProperty(window.SVGPathSegCurvetoCubicAbs.prototype, \"x2\", { get: function() { return this._x2 }, set: function(x2) { this._x2 = x2; this._segmentChanged() }, enumerable: true })\n        Object.defineProperty(window.SVGPathSegCurvetoCubicAbs.prototype, \"y2\", { get: function() { return this._y2 }, set: function(y2) { this._y2 = y2; this._segmentChanged() }, enumerable: true })\n\n        window.SVGPathSegCurvetoCubicRel = function(owningPathSegList, x, y, x1, y1, x2, y2) {\n            window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_REL, \"c\", owningPathSegList)\n            this._x = x\n            this._y = y\n            this._x1 = x1\n            this._y1 = y1\n            this._x2 = x2\n            this._y2 = y2\n        }\n        window.SVGPathSegCurvetoCubicRel.prototype = Object.create(window.SVGPathSeg.prototype)\n        window.SVGPathSegCurvetoCubicRel.prototype.toString = function() { return \"[object SVGPathSegCurvetoCubicRel]\" }\n        window.SVGPathSegCurvetoCubicRel.prototype._asPathString = function() { return `${this.pathSegTypeAsLetter  } ${  this._x1  } ${  this._y1  } ${  this._x2  } ${  this._y2  } ${  this._x  } ${  this._y}` }\n        window.SVGPathSegCurvetoCubicRel.prototype.clone = function() { return new window.SVGPathSegCurvetoCubicRel(undefined, this._x, this._y, this._x1, this._y1, this._x2, this._y2) }\n        Object.defineProperty(window.SVGPathSegCurvetoCubicRel.prototype, \"x\", { get: function() { return this._x }, set: function(x) { this._x = x; this._segmentChanged() }, enumerable: true })\n        Object.defineProperty(window.SVGPathSegCurvetoCubicRel.prototype, \"y\", { get: function() { return this._y }, set: function(y) { this._y = y; this._segmentChanged() }, enumerable: true })\n        Object.defineProperty(window.SVGPathSegCurvetoCubicRel.prototype, \"x1\", { get: function() { return this._x1 }, set: function(x1) { this._x1 = x1; this._segmentChanged() }, enumerable: true })\n        Object.defineProperty(window.SVGPathSegCurvetoCubicRel.prototype, \"y1\", { get: function() { return this._y1 }, set: function(y1) { this._y1 = y1; this._segmentChanged() }, enumerable: true })\n        Object.defineProperty(window.SVGPathSegCurvetoCubicRel.prototype, \"x2\", { get: function() { return this._x2 }, set: function(x2) { this._x2 = x2; this._segmentChanged() }, enumerable: true })\n        Object.defineProperty(window.SVGPathSegCurvetoCubicRel.prototype, \"y2\", { get: function() { return this._y2 }, set: function(y2) { this._y2 = y2; this._segmentChanged() }, enumerable: true })\n\n        window.SVGPathSegCurvetoQuadraticAbs = function(owningPathSegList, x, y, x1, y1) {\n            window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_ABS, \"Q\", owningPathSegList)\n            this._x = x\n            this._y = y\n            this._x1 = x1\n            this._y1 = y1\n        }\n        window.SVGPathSegCurvetoQuadraticAbs.prototype = Object.create(window.SVGPathSeg.prototype)\n        window.SVGPathSegCurvetoQuadraticAbs.prototype.toString = function() { return \"[object SVGPathSegCurvetoQuadraticAbs]\" }\n        window.SVGPathSegCurvetoQuadraticAbs.prototype._asPathString = function() { return `${this.pathSegTypeAsLetter  } ${  this._x1  } ${  this._y1  } ${  this._x  } ${  this._y}` }\n        window.SVGPathSegCurvetoQuadraticAbs.prototype.clone = function() { return new window.SVGPathSegCurvetoQuadraticAbs(undefined, this._x, this._y, this._x1, this._y1) }\n        Object.defineProperty(window.SVGPathSegCurvetoQuadraticAbs.prototype, \"x\", { get: function() { return this._x }, set: function(x) { this._x = x; this._segmentChanged() }, enumerable: true })\n        Object.defineProperty(window.SVGPathSegCurvetoQuadraticAbs.prototype, \"y\", { get: function() { return this._y }, set: function(y) { this._y = y; this._segmentChanged() }, enumerable: true })\n        Object.defineProperty(window.SVGPathSegCurvetoQuadraticAbs.prototype, \"x1\", { get: function() { return this._x1 }, set: function(x1) { this._x1 = x1; this._segmentChanged() }, enumerable: true })\n        Object.defineProperty(window.SVGPathSegCurvetoQuadraticAbs.prototype, \"y1\", { get: function() { return this._y1 }, set: function(y1) { this._y1 = y1; this._segmentChanged() }, enumerable: true })\n\n        window.SVGPathSegCurvetoQuadraticRel = function(owningPathSegList, x, y, x1, y1) {\n            window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_REL, \"q\", owningPathSegList)\n            this._x = x\n            this._y = y\n            this._x1 = x1\n            this._y1 = y1\n        }\n        window.SVGPathSegCurvetoQuadraticRel.prototype = Object.create(window.SVGPathSeg.prototype)\n        window.SVGPathSegCurvetoQuadraticRel.prototype.toString = function() { return \"[object SVGPathSegCurvetoQuadraticRel]\" }\n        window.SVGPathSegCurvetoQuadraticRel.prototype._asPathString = function() { return `${this.pathSegTypeAsLetter  } ${  this._x1  } ${  this._y1  } ${  this._x  } ${  this._y}` }\n        window.SVGPathSegCurvetoQuadraticRel.prototype.clone = function() { return new window.SVGPathSegCurvetoQuadraticRel(undefined, this._x, this._y, this._x1, this._y1) }\n        Object.defineProperty(window.SVGPathSegCurvetoQuadraticRel.prototype, \"x\", { get: function() { return this._x }, set: function(x) { this._x = x; this._segmentChanged() }, enumerable: true })\n        Object.defineProperty(window.SVGPathSegCurvetoQuadraticRel.prototype, \"y\", { get: function() { return this._y }, set: function(y) { this._y = y; this._segmentChanged() }, enumerable: true })\n        Object.defineProperty(window.SVGPathSegCurvetoQuadraticRel.prototype, \"x1\", { get: function() { return this._x1 }, set: function(x1) { this._x1 = x1; this._segmentChanged() }, enumerable: true })\n        Object.defineProperty(window.SVGPathSegCurvetoQuadraticRel.prototype, \"y1\", { get: function() { return this._y1 }, set: function(y1) { this._y1 = y1; this._segmentChanged() }, enumerable: true })\n\n        window.SVGPathSegArcAbs = function(owningPathSegList, x, y, r1, r2, angle, largeArcFlag, sweepFlag) {\n            window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_ARC_ABS, \"A\", owningPathSegList)\n            this._x = x\n            this._y = y\n            this._r1 = r1\n            this._r2 = r2\n            this._angle = angle\n            this._largeArcFlag = largeArcFlag\n            this._sweepFlag = sweepFlag\n        }\n        window.SVGPathSegArcAbs.prototype = Object.create(window.SVGPathSeg.prototype)\n        window.SVGPathSegArcAbs.prototype.toString = function() { return \"[object SVGPathSegArcAbs]\" }\n        window.SVGPathSegArcAbs.prototype._asPathString = function() { return `${this.pathSegTypeAsLetter  } ${  this._r1  } ${  this._r2  } ${  this._angle  } ${  this._largeArcFlag ? \"1\" : \"0\"  } ${  this._sweepFlag ? \"1\" : \"0\"  } ${  this._x  } ${  this._y}` }\n        window.SVGPathSegArcAbs.prototype.clone = function() { return new window.SVGPathSegArcAbs(undefined, this._x, this._y, this._r1, this._r2, this._angle, this._largeArcFlag, this._sweepFlag) }\n        Object.defineProperty(window.SVGPathSegArcAbs.prototype, \"x\", { get: function() { return this._x }, set: function(x) { this._x = x; this._segmentChanged() }, enumerable: true })\n        Object.defineProperty(window.SVGPathSegArcAbs.prototype, \"y\", { get: function() { return this._y }, set: function(y) { this._y = y; this._segmentChanged() }, enumerable: true })\n        Object.defineProperty(window.SVGPathSegArcAbs.prototype, \"r1\", { get: function() { return this._r1 }, set: function(r1) { this._r1 = r1; this._segmentChanged() }, enumerable: true })\n        Object.defineProperty(window.SVGPathSegArcAbs.prototype, \"r2\", { get: function() { return this._r2 }, set: function(r2) { this._r2 = r2; this._segmentChanged() }, enumerable: true })\n        Object.defineProperty(window.SVGPathSegArcAbs.prototype, \"angle\", { get: function() { return this._angle }, set: function(angle) { this._angle = angle; this._segmentChanged() }, enumerable: true })\n        Object.defineProperty(window.SVGPathSegArcAbs.prototype, \"largeArcFlag\", { get: function() { return this._largeArcFlag }, set: function(largeArcFlag) { this._largeArcFlag = largeArcFlag; this._segmentChanged() }, enumerable: true })\n        Object.defineProperty(window.SVGPathSegArcAbs.prototype, \"sweepFlag\", { get: function() { return this._sweepFlag }, set: function(sweepFlag) { this._sweepFlag = sweepFlag; this._segmentChanged() }, enumerable: true })\n\n        window.SVGPathSegArcRel = function(owningPathSegList, x, y, r1, r2, angle, largeArcFlag, sweepFlag) {\n            window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_ARC_REL, \"a\", owningPathSegList)\n            this._x = x\n            this._y = y\n            this._r1 = r1\n            this._r2 = r2\n            this._angle = angle\n            this._largeArcFlag = largeArcFlag\n            this._sweepFlag = sweepFlag\n        }\n        window.SVGPathSegArcRel.prototype = Object.create(window.SVGPathSeg.prototype)\n        window.SVGPathSegArcRel.prototype.toString = function() { return \"[object SVGPathSegArcRel]\" }\n        window.SVGPathSegArcRel.prototype._asPathString = function() { return `${this.pathSegTypeAsLetter  } ${  this._r1  } ${  this._r2  } ${  this._angle  } ${  this._largeArcFlag ? \"1\" : \"0\"  } ${  this._sweepFlag ? \"1\" : \"0\"  } ${  this._x  } ${  this._y}` }\n        window.SVGPathSegArcRel.prototype.clone = function() { return new window.SVGPathSegArcRel(undefined, this._x, this._y, this._r1, this._r2, this._angle, this._largeArcFlag, this._sweepFlag) }\n        Object.defineProperty(window.SVGPathSegArcRel.prototype, \"x\", { get: function() { return this._x }, set: function(x) { this._x = x; this._segmentChanged() }, enumerable: true })\n        Object.defineProperty(window.SVGPathSegArcRel.prototype, \"y\", { get: function() { return this._y }, set: function(y) { this._y = y; this._segmentChanged() }, enumerable: true })\n        Object.defineProperty(window.SVGPathSegArcRel.prototype, \"r1\", { get: function() { return this._r1 }, set: function(r1) { this._r1 = r1; this._segmentChanged() }, enumerable: true })\n        Object.defineProperty(window.SVGPathSegArcRel.prototype, \"r2\", { get: function() { return this._r2 }, set: function(r2) { this._r2 = r2; this._segmentChanged() }, enumerable: true })\n        Object.defineProperty(window.SVGPathSegArcRel.prototype, \"angle\", { get: function() { return this._angle }, set: function(angle) { this._angle = angle; this._segmentChanged() }, enumerable: true })\n        Object.defineProperty(window.SVGPathSegArcRel.prototype, \"largeArcFlag\", { get: function() { return this._largeArcFlag }, set: function(largeArcFlag) { this._largeArcFlag = largeArcFlag; this._segmentChanged() }, enumerable: true })\n        Object.defineProperty(window.SVGPathSegArcRel.prototype, \"sweepFlag\", { get: function() { return this._sweepFlag }, set: function(sweepFlag) { this._sweepFlag = sweepFlag; this._segmentChanged() }, enumerable: true })\n\n        window.SVGPathSegLinetoHorizontalAbs = function(owningPathSegList, x) {\n            window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_LINETO_HORIZONTAL_ABS, \"H\", owningPathSegList)\n            this._x = x\n        }\n        window.SVGPathSegLinetoHorizontalAbs.prototype = Object.create(window.SVGPathSeg.prototype)\n        window.SVGPathSegLinetoHorizontalAbs.prototype.toString = function() { return \"[object SVGPathSegLinetoHorizontalAbs]\" }\n        window.SVGPathSegLinetoHorizontalAbs.prototype._asPathString = function() { return `${this.pathSegTypeAsLetter  } ${  this._x}` }\n        window.SVGPathSegLinetoHorizontalAbs.prototype.clone = function() { return new window.SVGPathSegLinetoHorizontalAbs(undefined, this._x) }\n        Object.defineProperty(window.SVGPathSegLinetoHorizontalAbs.prototype, \"x\", { get: function() { return this._x }, set: function(x) { this._x = x; this._segmentChanged() }, enumerable: true })\n\n        window.SVGPathSegLinetoHorizontalRel = function(owningPathSegList, x) {\n            window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_LINETO_HORIZONTAL_REL, \"h\", owningPathSegList)\n            this._x = x\n        }\n        window.SVGPathSegLinetoHorizontalRel.prototype = Object.create(window.SVGPathSeg.prototype)\n        window.SVGPathSegLinetoHorizontalRel.prototype.toString = function() { return \"[object SVGPathSegLinetoHorizontalRel]\" }\n        window.SVGPathSegLinetoHorizontalRel.prototype._asPathString = function() { return `${this.pathSegTypeAsLetter  } ${  this._x}` }\n        window.SVGPathSegLinetoHorizontalRel.prototype.clone = function() { return new window.SVGPathSegLinetoHorizontalRel(undefined, this._x) }\n        Object.defineProperty(window.SVGPathSegLinetoHorizontalRel.prototype, \"x\", { get: function() { return this._x }, set: function(x) { this._x = x; this._segmentChanged() }, enumerable: true })\n\n        window.SVGPathSegLinetoVerticalAbs = function(owningPathSegList, y) {\n            window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_LINETO_VERTICAL_ABS, \"V\", owningPathSegList)\n            this._y = y\n        }\n        window.SVGPathSegLinetoVerticalAbs.prototype = Object.create(window.SVGPathSeg.prototype)\n        window.SVGPathSegLinetoVerticalAbs.prototype.toString = function() { return \"[object SVGPathSegLinetoVerticalAbs]\" }\n        window.SVGPathSegLinetoVerticalAbs.prototype._asPathString = function() { return `${this.pathSegTypeAsLetter  } ${  this._y}` }\n        window.SVGPathSegLinetoVerticalAbs.prototype.clone = function() { return new window.SVGPathSegLinetoVerticalAbs(undefined, this._y) }\n        Object.defineProperty(window.SVGPathSegLinetoVerticalAbs.prototype, \"y\", { get: function() { return this._y }, set: function(y) { this._y = y; this._segmentChanged() }, enumerable: true })\n\n        window.SVGPathSegLinetoVerticalRel = function(owningPathSegList, y) {\n            window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_LINETO_VERTICAL_REL, \"v\", owningPathSegList)\n            this._y = y\n        }\n        window.SVGPathSegLinetoVerticalRel.prototype = Object.create(window.SVGPathSeg.prototype)\n        window.SVGPathSegLinetoVerticalRel.prototype.toString = function() { return \"[object SVGPathSegLinetoVerticalRel]\" }\n        window.SVGPathSegLinetoVerticalRel.prototype._asPathString = function() { return `${this.pathSegTypeAsLetter  } ${  this._y}` }\n        window.SVGPathSegLinetoVerticalRel.prototype.clone = function() { return new window.SVGPathSegLinetoVerticalRel(undefined, this._y) }\n        Object.defineProperty(window.SVGPathSegLinetoVerticalRel.prototype, \"y\", { get: function() { return this._y }, set: function(y) { this._y = y; this._segmentChanged() }, enumerable: true })\n\n        window.SVGPathSegCurvetoCubicSmoothAbs = function(owningPathSegList, x, y, x2, y2) {\n            window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_SMOOTH_ABS, \"S\", owningPathSegList)\n            this._x = x\n            this._y = y\n            this._x2 = x2\n            this._y2 = y2\n        }\n        window.SVGPathSegCurvetoCubicSmoothAbs.prototype = Object.create(window.SVGPathSeg.prototype)\n        window.SVGPathSegCurvetoCubicSmoothAbs.prototype.toString = function() { return \"[object SVGPathSegCurvetoCubicSmoothAbs]\" }\n        window.SVGPathSegCurvetoCubicSmoothAbs.prototype._asPathString = function() { return `${this.pathSegTypeAsLetter  } ${  this._x2  } ${  this._y2  } ${  this._x  } ${  this._y}` }\n        window.SVGPathSegCurvetoCubicSmoothAbs.prototype.clone = function() { return new window.SVGPathSegCurvetoCubicSmoothAbs(undefined, this._x, this._y, this._x2, this._y2) }\n        Object.defineProperty(window.SVGPathSegCurvetoCubicSmoothAbs.prototype, \"x\", { get: function() { return this._x }, set: function(x) { this._x = x; this._segmentChanged() }, enumerable: true })\n        Object.defineProperty(window.SVGPathSegCurvetoCubicSmoothAbs.prototype, \"y\", { get: function() { return this._y }, set: function(y) { this._y = y; this._segmentChanged() }, enumerable: true })\n        Object.defineProperty(window.SVGPathSegCurvetoCubicSmoothAbs.prototype, \"x2\", { get: function() { return this._x2 }, set: function(x2) { this._x2 = x2; this._segmentChanged() }, enumerable: true })\n        Object.defineProperty(window.SVGPathSegCurvetoCubicSmoothAbs.prototype, \"y2\", { get: function() { return this._y2 }, set: function(y2) { this._y2 = y2; this._segmentChanged() }, enumerable: true })\n\n        window.SVGPathSegCurvetoCubicSmoothRel = function(owningPathSegList, x, y, x2, y2) {\n            window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_SMOOTH_REL, \"s\", owningPathSegList)\n            this._x = x\n            this._y = y\n            this._x2 = x2\n            this._y2 = y2\n        }\n        window.SVGPathSegCurvetoCubicSmoothRel.prototype = Object.create(window.SVGPathSeg.prototype)\n        window.SVGPathSegCurvetoCubicSmoothRel.prototype.toString = function() { return \"[object SVGPathSegCurvetoCubicSmoothRel]\" }\n        window.SVGPathSegCurvetoCubicSmoothRel.prototype._asPathString = function() { return `${this.pathSegTypeAsLetter  } ${  this._x2  } ${  this._y2  } ${  this._x  } ${  this._y}` }\n        window.SVGPathSegCurvetoCubicSmoothRel.prototype.clone = function() { return new window.SVGPathSegCurvetoCubicSmoothRel(undefined, this._x, this._y, this._x2, this._y2) }\n        Object.defineProperty(window.SVGPathSegCurvetoCubicSmoothRel.prototype, \"x\", { get: function() { return this._x }, set: function(x) { this._x = x; this._segmentChanged() }, enumerable: true })\n        Object.defineProperty(window.SVGPathSegCurvetoCubicSmoothRel.prototype, \"y\", { get: function() { return this._y }, set: function(y) { this._y = y; this._segmentChanged() }, enumerable: true })\n        Object.defineProperty(window.SVGPathSegCurvetoCubicSmoothRel.prototype, \"x2\", { get: function() { return this._x2 }, set: function(x2) { this._x2 = x2; this._segmentChanged() }, enumerable: true })\n        Object.defineProperty(window.SVGPathSegCurvetoCubicSmoothRel.prototype, \"y2\", { get: function() { return this._y2 }, set: function(y2) { this._y2 = y2; this._segmentChanged() }, enumerable: true })\n\n        window.SVGPathSegCurvetoQuadraticSmoothAbs = function(owningPathSegList, x, y) {\n            window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_SMOOTH_ABS, \"T\", owningPathSegList)\n            this._x = x\n            this._y = y\n        }\n        window.SVGPathSegCurvetoQuadraticSmoothAbs.prototype = Object.create(window.SVGPathSeg.prototype)\n        window.SVGPathSegCurvetoQuadraticSmoothAbs.prototype.toString = function() { return \"[object SVGPathSegCurvetoQuadraticSmoothAbs]\" }\n        window.SVGPathSegCurvetoQuadraticSmoothAbs.prototype._asPathString = function() { return `${this.pathSegTypeAsLetter  } ${  this._x  } ${  this._y}` }\n        window.SVGPathSegCurvetoQuadraticSmoothAbs.prototype.clone = function() { return new window.SVGPathSegCurvetoQuadraticSmoothAbs(undefined, this._x, this._y) }\n        Object.defineProperty(window.SVGPathSegCurvetoQuadraticSmoothAbs.prototype, \"x\", { get: function() { return this._x }, set: function(x) { this._x = x; this._segmentChanged() }, enumerable: true })\n        Object.defineProperty(window.SVGPathSegCurvetoQuadraticSmoothAbs.prototype, \"y\", { get: function() { return this._y }, set: function(y) { this._y = y; this._segmentChanged() }, enumerable: true })\n\n        window.SVGPathSegCurvetoQuadraticSmoothRel = function(owningPathSegList, x, y) {\n            window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_SMOOTH_REL, \"t\", owningPathSegList)\n            this._x = x\n            this._y = y\n        }\n        window.SVGPathSegCurvetoQuadraticSmoothRel.prototype = Object.create(window.SVGPathSeg.prototype)\n        window.SVGPathSegCurvetoQuadraticSmoothRel.prototype.toString = function() { return \"[object SVGPathSegCurvetoQuadraticSmoothRel]\" }\n        window.SVGPathSegCurvetoQuadraticSmoothRel.prototype._asPathString = function() { return `${this.pathSegTypeAsLetter  } ${  this._x  } ${  this._y}` }\n        window.SVGPathSegCurvetoQuadraticSmoothRel.prototype.clone = function() { return new window.SVGPathSegCurvetoQuadraticSmoothRel(undefined, this._x, this._y) }\n        Object.defineProperty(window.SVGPathSegCurvetoQuadraticSmoothRel.prototype, \"x\", { get: function() { return this._x }, set: function(x) { this._x = x; this._segmentChanged() }, enumerable: true })\n        Object.defineProperty(window.SVGPathSegCurvetoQuadraticSmoothRel.prototype, \"y\", { get: function() { return this._y }, set: function(y) { this._y = y; this._segmentChanged() }, enumerable: true })\n\n        // Add createSVGPathSeg* functions to window.SVGPathElement.\n        // Spec: http://www.w3.org/TR/SVG11/single-page.html#paths-Interfacewindow.SVGPathElement.\n        window.SVGPathElement.prototype.createSVGPathSegClosePath = function() { return new window.SVGPathSegClosePath(undefined) }\n        window.SVGPathElement.prototype.createSVGPathSegMovetoAbs = function(x, y) { return new window.SVGPathSegMovetoAbs(undefined, x, y) }\n        window.SVGPathElement.prototype.createSVGPathSegMovetoRel = function(x, y) { return new window.SVGPathSegMovetoRel(undefined, x, y) }\n        window.SVGPathElement.prototype.createSVGPathSegLinetoAbs = function(x, y) { return new window.SVGPathSegLinetoAbs(undefined, x, y) }\n        window.SVGPathElement.prototype.createSVGPathSegLinetoRel = function(x, y) { return new window.SVGPathSegLinetoRel(undefined, x, y) }\n        window.SVGPathElement.prototype.createSVGPathSegCurvetoCubicAbs = function(x, y, x1, y1, x2, y2) { return new window.SVGPathSegCurvetoCubicAbs(undefined, x, y, x1, y1, x2, y2) }\n        window.SVGPathElement.prototype.createSVGPathSegCurvetoCubicRel = function(x, y, x1, y1, x2, y2) { return new window.SVGPathSegCurvetoCubicRel(undefined, x, y, x1, y1, x2, y2) }\n        window.SVGPathElement.prototype.createSVGPathSegCurvetoQuadraticAbs = function(x, y, x1, y1) { return new window.SVGPathSegCurvetoQuadraticAbs(undefined, x, y, x1, y1) }\n        window.SVGPathElement.prototype.createSVGPathSegCurvetoQuadraticRel = function(x, y, x1, y1) { return new window.SVGPathSegCurvetoQuadraticRel(undefined, x, y, x1, y1) }\n        window.SVGPathElement.prototype.createSVGPathSegArcAbs = function(x, y, r1, r2, angle, largeArcFlag, sweepFlag) { return new window.SVGPathSegArcAbs(undefined, x, y, r1, r2, angle, largeArcFlag, sweepFlag) }\n        window.SVGPathElement.prototype.createSVGPathSegArcRel = function(x, y, r1, r2, angle, largeArcFlag, sweepFlag) { return new window.SVGPathSegArcRel(undefined, x, y, r1, r2, angle, largeArcFlag, sweepFlag) }\n        window.SVGPathElement.prototype.createSVGPathSegLinetoHorizontalAbs = function(x) { return new window.SVGPathSegLinetoHorizontalAbs(undefined, x) }\n        window.SVGPathElement.prototype.createSVGPathSegLinetoHorizontalRel = function(x) { return new window.SVGPathSegLinetoHorizontalRel(undefined, x) }\n        window.SVGPathElement.prototype.createSVGPathSegLinetoVerticalAbs = function(y) { return new window.SVGPathSegLinetoVerticalAbs(undefined, y) }\n        window.SVGPathElement.prototype.createSVGPathSegLinetoVerticalRel = function(y) { return new window.SVGPathSegLinetoVerticalRel(undefined, y) }\n        window.SVGPathElement.prototype.createSVGPathSegCurvetoCubicSmoothAbs = function(x, y, x2, y2) { return new window.SVGPathSegCurvetoCubicSmoothAbs(undefined, x, y, x2, y2) }\n        window.SVGPathElement.prototype.createSVGPathSegCurvetoCubicSmoothRel = function(x, y, x2, y2) { return new window.SVGPathSegCurvetoCubicSmoothRel(undefined, x, y, x2, y2) }\n        window.SVGPathElement.prototype.createSVGPathSegCurvetoQuadraticSmoothAbs = function(x, y) { return new window.SVGPathSegCurvetoQuadraticSmoothAbs(undefined, x, y) }\n        window.SVGPathElement.prototype.createSVGPathSegCurvetoQuadraticSmoothRel = function(x, y) { return new window.SVGPathSegCurvetoQuadraticSmoothRel(undefined, x, y) }\n    }\n\n    if (typeof window !== 'undefined' && !(\"SVGPathSegList\" in window)) {\n        // Spec: http://www.w3.org/TR/SVG11/single-page.html#paths-InterfaceSVGPathSegList\n        window.SVGPathSegList = function(pathElement) {\n            this._pathElement = pathElement\n            this._list = this._parsePath(this._pathElement.getAttribute(\"d\"))\n\n            // Use a MutationObserver to catch changes to the path's \"d\" attribute.\n            this._mutationObserverConfig = { attributes: true, attributeFilter: [\"d\"] }\n            this._pathElementMutationObserver = new MutationObserver(this._updateListFromPathMutations.bind(this))\n            this._pathElementMutationObserver.observe(this._pathElement, this._mutationObserverConfig)\n        }\n\n        window.SVGPathSegList.prototype.classname = \"SVGPathSegList\"\n\n        Object.defineProperty(window.SVGPathSegList.prototype, \"numberOfItems\", {\n            get: function() {\n                this._checkPathSynchronizedToList()\n                return this._list.length\n            },\n            enumerable: true\n        })\n\n        // Add the pathSegList accessors to window.SVGPathElement.\n        // Spec: http://www.w3.org/TR/SVG11/single-page.html#paths-InterfaceSVGAnimatedPathData\n        Object.defineProperty(window.SVGPathElement.prototype, \"pathSegList\", {\n            get: function() {\n                if (!this._pathSegList)\n                    this._pathSegList = new window.SVGPathSegList(this)\n                return this._pathSegList\n            },\n            enumerable: true\n        })\n        // FIXME: The following are not implemented and simply return window.SVGPathElement.pathSegList.\n        Object.defineProperty(window.SVGPathElement.prototype, \"normalizedPathSegList\", { get: function() { return this.pathSegList }, enumerable: true })\n        Object.defineProperty(window.SVGPathElement.prototype, \"animatedPathSegList\", { get: function() { return this.pathSegList }, enumerable: true })\n        Object.defineProperty(window.SVGPathElement.prototype, \"animatedNormalizedPathSegList\", { get: function() { return this.pathSegList }, enumerable: true })\n\n        // Process any pending mutations to the path element and update the list as needed.\n        // This should be the first call of all public functions and is needed because\n        // MutationObservers are not synchronous so we can have pending asynchronous mutations.\n        window.SVGPathSegList.prototype._checkPathSynchronizedToList = function() {\n            this._updateListFromPathMutations(this._pathElementMutationObserver.takeRecords())\n        }\n\n        window.SVGPathSegList.prototype._updateListFromPathMutations = function(mutationRecords) {\n            if (!this._pathElement)\n                return\n            let hasPathMutations = false\n            mutationRecords.forEach(function(record) {\n                if (record.attributeName == \"d\")\n                    hasPathMutations = true\n            })\n            if (hasPathMutations)\n                this._list = this._parsePath(this._pathElement.getAttribute(\"d\"))\n        }\n\n        // Serialize the list and update the path's 'd' attribute.\n        window.SVGPathSegList.prototype._writeListToPath = function() {\n            this._pathElementMutationObserver.disconnect()\n            this._pathElement.setAttribute(\"d\", window.SVGPathSegList._pathSegArrayAsString(this._list))\n            this._pathElementMutationObserver.observe(this._pathElement, this._mutationObserverConfig)\n        }\n\n        // When a path segment changes the list needs to be synchronized back to the path element.\n        window.SVGPathSegList.prototype.segmentChanged = function(pathSeg) {\n            this._writeListToPath()\n        }\n\n        window.SVGPathSegList.prototype.clear = function() {\n            this._checkPathSynchronizedToList()\n\n            this._list.forEach(function(pathSeg) {\n                pathSeg._owningPathSegList = null\n            })\n            this._list = []\n            this._writeListToPath()\n        }\n\n        window.SVGPathSegList.prototype.initialize = function(newItem) {\n            this._checkPathSynchronizedToList()\n\n            this._list = [newItem]\n            newItem._owningPathSegList = this\n            this._writeListToPath()\n            return newItem\n        }\n\n        window.SVGPathSegList.prototype._checkValidIndex = function(index) {\n            if (isNaN(index) || index < 0 || index >= this.numberOfItems)\n                throw \"INDEX_SIZE_ERR\"\n        }\n\n        window.SVGPathSegList.prototype.getItem = function(index) {\n            this._checkPathSynchronizedToList()\n\n            this._checkValidIndex(index)\n            return this._list[index]\n        }\n\n        window.SVGPathSegList.prototype.insertItemBefore = function(newItem, index) {\n            this._checkPathSynchronizedToList()\n\n            // Spec: If the index is greater than or equal to numberOfItems, then the new item is appended to the end of the list.\n            if (index > this.numberOfItems)\n                index = this.numberOfItems\n            if (newItem._owningPathSegList) {\n                // SVG2 spec says to make a copy.\n                newItem = newItem.clone()\n            }\n            this._list.splice(index, 0, newItem)\n            newItem._owningPathSegList = this\n            this._writeListToPath()\n            return newItem\n        }\n\n        window.SVGPathSegList.prototype.replaceItem = function(newItem, index) {\n            this._checkPathSynchronizedToList()\n\n            if (newItem._owningPathSegList) {\n                // SVG2 spec says to make a copy.\n                newItem = newItem.clone()\n            }\n            this._checkValidIndex(index)\n            this._list[index] = newItem\n            newItem._owningPathSegList = this\n            this._writeListToPath()\n            return newItem\n        }\n\n        window.SVGPathSegList.prototype.removeItem = function(index) {\n            this._checkPathSynchronizedToList()\n\n            this._checkValidIndex(index)\n            const item = this._list[index]\n            this._list.splice(index, 1)\n            this._writeListToPath()\n            return item\n        }\n\n        window.SVGPathSegList.prototype.appendItem = function(newItem) {\n            this._checkPathSynchronizedToList()\n\n            if (newItem._owningPathSegList) {\n                // SVG2 spec says to make a copy.\n                newItem = newItem.clone()\n            }\n            this._list.push(newItem)\n            newItem._owningPathSegList = this\n            // TODO: Optimize this to just append to the existing attribute.\n            this._writeListToPath()\n            return newItem\n        }\n\n        window.SVGPathSegList._pathSegArrayAsString = function(pathSegArray) {\n            let string = \"\"\n            let first = true\n            pathSegArray.forEach(function(pathSeg) {\n                if (first) {\n                    first = false\n                    string += pathSeg._asPathString()\n                } else {\n                    string += ` ${  pathSeg._asPathString()}`\n                }\n            })\n            return string\n        }\n\n        // This closely follows SVGPathParser::parsePath from Source/core/svg/SVGPathParser.cpp.\n        window.SVGPathSegList.prototype._parsePath = function(string) {\n            if (!string || string.length == 0)\n                return []\n\n            const owningPathSegList = this\n\n            const Builder = function() {\n                this.pathSegList = []\n            }\n\n            Builder.prototype.appendSegment = function(pathSeg) {\n                this.pathSegList.push(pathSeg)\n            }\n\n            const Source = function(string) {\n                this._string = string\n                this._currentIndex = 0\n                this._endIndex = this._string.length\n                this._previousCommand = window.SVGPathSeg.PATHSEG_UNKNOWN\n\n                this._skipOptionalSpaces()\n            }\n\n            Source.prototype._isCurrentSpace = function() {\n                const character = this._string[this._currentIndex]\n                return character <= \" \" && (character == \" \" || character == \"\\n\" || character == \"\\t\" || character == \"\\r\" || character == \"\\f\")\n            }\n\n            Source.prototype._skipOptionalSpaces = function() {\n                while (this._currentIndex < this._endIndex && this._isCurrentSpace())\n                    this._currentIndex++\n                return this._currentIndex < this._endIndex\n            }\n\n            Source.prototype._skipOptionalSpacesOrDelimiter = function() {\n                if (this._currentIndex < this._endIndex && !this._isCurrentSpace() && this._string.charAt(this._currentIndex) != \",\")\n                    return false\n                if (this._skipOptionalSpaces()) {\n                    if (this._currentIndex < this._endIndex && this._string.charAt(this._currentIndex) == \",\") {\n                        this._currentIndex++\n                        this._skipOptionalSpaces()\n                    }\n                }\n                return this._currentIndex < this._endIndex\n            }\n\n            Source.prototype.hasMoreData = function() {\n                return this._currentIndex < this._endIndex\n            }\n\n            Source.prototype.peekSegmentType = function() {\n                const lookahead = this._string[this._currentIndex]\n                return this._pathSegTypeFromChar(lookahead)\n            }\n\n            Source.prototype._pathSegTypeFromChar = function(lookahead) {\n                switch (lookahead) {\n                case \"Z\":\n                case \"z\":\n                    return window.SVGPathSeg.PATHSEG_CLOSEPATH\n                case \"M\":\n                    return window.SVGPathSeg.PATHSEG_MOVETO_ABS\n                case \"m\":\n                    return window.SVGPathSeg.PATHSEG_MOVETO_REL\n                case \"L\":\n                    return window.SVGPathSeg.PATHSEG_LINETO_ABS\n                case \"l\":\n                    return window.SVGPathSeg.PATHSEG_LINETO_REL\n                case \"C\":\n                    return window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_ABS\n                case \"c\":\n                    return window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_REL\n                case \"Q\":\n                    return window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_ABS\n                case \"q\":\n                    return window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_REL\n                case \"A\":\n                    return window.SVGPathSeg.PATHSEG_ARC_ABS\n                case \"a\":\n                    return window.SVGPathSeg.PATHSEG_ARC_REL\n                case \"H\":\n                    return window.SVGPathSeg.PATHSEG_LINETO_HORIZONTAL_ABS\n                case \"h\":\n                    return window.SVGPathSeg.PATHSEG_LINETO_HORIZONTAL_REL\n                case \"V\":\n                    return window.SVGPathSeg.PATHSEG_LINETO_VERTICAL_ABS\n                case \"v\":\n                    return window.SVGPathSeg.PATHSEG_LINETO_VERTICAL_REL\n                case \"S\":\n                    return window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_SMOOTH_ABS\n                case \"s\":\n                    return window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_SMOOTH_REL\n                case \"T\":\n                    return window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_SMOOTH_ABS\n                case \"t\":\n                    return window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_SMOOTH_REL\n                default:\n                    return window.SVGPathSeg.PATHSEG_UNKNOWN\n                }\n            }\n\n            Source.prototype._nextCommandHelper = function(lookahead, previousCommand) {\n                // Check for remaining coordinates in the current command.\n                if ((lookahead == \"+\" || lookahead == \"-\" || lookahead == \".\" || (lookahead >= \"0\" && lookahead <= \"9\")) && previousCommand != window.SVGPathSeg.PATHSEG_CLOSEPATH) {\n                    if (previousCommand == window.SVGPathSeg.PATHSEG_MOVETO_ABS)\n                        return window.SVGPathSeg.PATHSEG_LINETO_ABS\n                    if (previousCommand == window.SVGPathSeg.PATHSEG_MOVETO_REL)\n                        return window.SVGPathSeg.PATHSEG_LINETO_REL\n                    return previousCommand\n                }\n                return window.SVGPathSeg.PATHSEG_UNKNOWN\n            }\n\n            Source.prototype.initialCommandIsMoveTo = function() {\n                // If the path is empty it is still valid, so return true.\n                if (!this.hasMoreData())\n                    return true\n                const command = this.peekSegmentType()\n                // Path must start with moveTo.\n                return command == window.SVGPathSeg.PATHSEG_MOVETO_ABS || command == window.SVGPathSeg.PATHSEG_MOVETO_REL\n            }\n\n            // Parse a number from an SVG path. This very closely follows genericParseNumber(...) from Source/core/svg/SVGParserUtilities.cpp.\n            // Spec: http://www.w3.org/TR/SVG11/single-page.html#paths-PathDataBNF\n            Source.prototype._parseNumber = function() {\n                let exponent = 0\n                let integer = 0\n                let frac = 1\n                let decimal = 0\n                let sign = 1\n                let expsign = 1\n\n                const startIndex = this._currentIndex\n\n                this._skipOptionalSpaces()\n\n                // Read the sign.\n                if (this._currentIndex < this._endIndex && this._string.charAt(this._currentIndex) == \"+\")\n                    this._currentIndex++\n                else if (this._currentIndex < this._endIndex && this._string.charAt(this._currentIndex) == \"-\") {\n                    this._currentIndex++\n                    sign = -1\n                }\n\n                if (this._currentIndex == this._endIndex || ((this._string.charAt(this._currentIndex) < \"0\" || this._string.charAt(this._currentIndex) > \"9\") && this._string.charAt(this._currentIndex) != \".\"))\n                    // The first character of a number must be one of [0-9+-.].\n                    return undefined\n\n                // Read the integer part, build right-to-left.\n                const startIntPartIndex = this._currentIndex\n                while (this._currentIndex < this._endIndex && this._string.charAt(this._currentIndex) >= \"0\" && this._string.charAt(this._currentIndex) <= \"9\")\n                    this._currentIndex++ // Advance to first non-digit.\n\n                if (this._currentIndex != startIntPartIndex) {\n                    let scanIntPartIndex = this._currentIndex - 1\n                    let multiplier = 1\n                    while (scanIntPartIndex >= startIntPartIndex) {\n                        integer += multiplier * (this._string.charAt(scanIntPartIndex--) - \"0\")\n                        multiplier *= 10\n                    }\n                }\n\n                // Read the decimals.\n                if (this._currentIndex < this._endIndex && this._string.charAt(this._currentIndex) == \".\") {\n                    this._currentIndex++\n\n                    // There must be a least one digit following the .\n                    if (this._currentIndex >= this._endIndex || this._string.charAt(this._currentIndex) < \"0\" || this._string.charAt(this._currentIndex) > \"9\")\n                        return undefined\n                    while (this._currentIndex < this._endIndex && this._string.charAt(this._currentIndex) >= \"0\" && this._string.charAt(this._currentIndex) <= \"9\") {\n                        frac *= 10\n                        decimal += (this._string.charAt(this._currentIndex) - \"0\") / frac\n                        this._currentIndex += 1\n                    }\n                }\n\n                // Read the exponent part.\n                if (this._currentIndex != startIndex && this._currentIndex + 1 < this._endIndex && (this._string.charAt(this._currentIndex) == \"e\" || this._string.charAt(this._currentIndex) == \"E\") && (this._string.charAt(this._currentIndex + 1) != \"x\" && this._string.charAt(this._currentIndex + 1) != \"m\")) {\n                    this._currentIndex++\n\n                    // Read the sign of the exponent.\n                    if (this._string.charAt(this._currentIndex) == \"+\") {\n                        this._currentIndex++\n                    } else if (this._string.charAt(this._currentIndex) == \"-\") {\n                        this._currentIndex++\n                        expsign = -1\n                    }\n\n                    // There must be an exponent.\n                    if (this._currentIndex >= this._endIndex || this._string.charAt(this._currentIndex) < \"0\" || this._string.charAt(this._currentIndex) > \"9\")\n                        return undefined\n\n                    while (this._currentIndex < this._endIndex && this._string.charAt(this._currentIndex) >= \"0\" && this._string.charAt(this._currentIndex) <= \"9\") {\n                        exponent *= 10\n                        exponent += (this._string.charAt(this._currentIndex) - \"0\")\n                        this._currentIndex++\n                    }\n                }\n\n                let number = integer + decimal\n                number *= sign\n\n                if (exponent)\n                    number *= Math.pow(10, expsign * exponent)\n\n                if (startIndex == this._currentIndex)\n                    return undefined\n\n                this._skipOptionalSpacesOrDelimiter()\n\n                return number\n            }\n\n            Source.prototype._parseArcFlag = function() {\n                if (this._currentIndex >= this._endIndex)\n                    return undefined\n                let flag = false\n                const flagChar = this._string.charAt(this._currentIndex++)\n                if (flagChar == \"0\")\n                    flag = false\n                else if (flagChar == \"1\")\n                    flag = true\n                else\n                    return undefined\n\n                this._skipOptionalSpacesOrDelimiter()\n                return flag\n            }\n\n            Source.prototype.parseSegment = function() {\n                const lookahead = this._string[this._currentIndex]\n                let command = this._pathSegTypeFromChar(lookahead)\n                if (command == window.SVGPathSeg.PATHSEG_UNKNOWN) {\n                    // Possibly an implicit command. Not allowed if this is the first command.\n                    if (this._previousCommand == window.SVGPathSeg.PATHSEG_UNKNOWN)\n                        return null\n                    command = this._nextCommandHelper(lookahead, this._previousCommand)\n                    if (command == window.SVGPathSeg.PATHSEG_UNKNOWN)\n                        return null\n                } else {\n                    this._currentIndex++\n                }\n\n                this._previousCommand = command\n\n                switch (command) {\n                case window.SVGPathSeg.PATHSEG_MOVETO_REL:\n                    return new window.SVGPathSegMovetoRel(owningPathSegList, this._parseNumber(), this._parseNumber())\n                case window.SVGPathSeg.PATHSEG_MOVETO_ABS:\n                    return new window.SVGPathSegMovetoAbs(owningPathSegList, this._parseNumber(), this._parseNumber())\n                case window.SVGPathSeg.PATHSEG_LINETO_REL:\n                    return new window.SVGPathSegLinetoRel(owningPathSegList, this._parseNumber(), this._parseNumber())\n                case window.SVGPathSeg.PATHSEG_LINETO_ABS:\n                    return new window.SVGPathSegLinetoAbs(owningPathSegList, this._parseNumber(), this._parseNumber())\n                case window.SVGPathSeg.PATHSEG_LINETO_HORIZONTAL_REL:\n                    return new window.SVGPathSegLinetoHorizontalRel(owningPathSegList, this._parseNumber())\n                case window.SVGPathSeg.PATHSEG_LINETO_HORIZONTAL_ABS:\n                    return new window.SVGPathSegLinetoHorizontalAbs(owningPathSegList, this._parseNumber())\n                case window.SVGPathSeg.PATHSEG_LINETO_VERTICAL_REL:\n                    return new window.SVGPathSegLinetoVerticalRel(owningPathSegList, this._parseNumber())\n                case window.SVGPathSeg.PATHSEG_LINETO_VERTICAL_ABS:\n                    return new window.SVGPathSegLinetoVerticalAbs(owningPathSegList, this._parseNumber())\n                case window.SVGPathSeg.PATHSEG_CLOSEPATH:\n                    this._skipOptionalSpaces()\n                    return new window.SVGPathSegClosePath(owningPathSegList)\n                case window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_REL:\n                    var points = {x1: this._parseNumber(), y1: this._parseNumber(), x2: this._parseNumber(), y2: this._parseNumber(), x: this._parseNumber(), y: this._parseNumber()}\n                    return new window.SVGPathSegCurvetoCubicRel(owningPathSegList, points.x, points.y, points.x1, points.y1, points.x2, points.y2)\n                case window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_ABS:\n                    var points = {x1: this._parseNumber(), y1: this._parseNumber(), x2: this._parseNumber(), y2: this._parseNumber(), x: this._parseNumber(), y: this._parseNumber()}\n                    return new window.SVGPathSegCurvetoCubicAbs(owningPathSegList, points.x, points.y, points.x1, points.y1, points.x2, points.y2)\n                case window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_SMOOTH_REL:\n                    var points = {x2: this._parseNumber(), y2: this._parseNumber(), x: this._parseNumber(), y: this._parseNumber()}\n                    return new window.SVGPathSegCurvetoCubicSmoothRel(owningPathSegList, points.x, points.y, points.x2, points.y2)\n                case window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_SMOOTH_ABS:\n                    var points = {x2: this._parseNumber(), y2: this._parseNumber(), x: this._parseNumber(), y: this._parseNumber()}\n                    return new window.SVGPathSegCurvetoCubicSmoothAbs(owningPathSegList, points.x, points.y, points.x2, points.y2)\n                case window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_REL:\n                    var points = {x1: this._parseNumber(), y1: this._parseNumber(), x: this._parseNumber(), y: this._parseNumber()}\n                    return new window.SVGPathSegCurvetoQuadraticRel(owningPathSegList, points.x, points.y, points.x1, points.y1)\n                case window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_ABS:\n                    var points = {x1: this._parseNumber(), y1: this._parseNumber(), x: this._parseNumber(), y: this._parseNumber()}\n                    return new window.SVGPathSegCurvetoQuadraticAbs(owningPathSegList, points.x, points.y, points.x1, points.y1)\n                case window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_SMOOTH_REL:\n                    return new window.SVGPathSegCurvetoQuadraticSmoothRel(owningPathSegList, this._parseNumber(), this._parseNumber())\n                case window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_SMOOTH_ABS:\n                    return new window.SVGPathSegCurvetoQuadraticSmoothAbs(owningPathSegList, this._parseNumber(), this._parseNumber())\n                case window.SVGPathSeg.PATHSEG_ARC_REL:\n                    var points = {x1: this._parseNumber(), y1: this._parseNumber(), arcAngle: this._parseNumber(), arcLarge: this._parseArcFlag(), arcSweep: this._parseArcFlag(), x: this._parseNumber(), y: this._parseNumber()}\n                    return new window.SVGPathSegArcRel(owningPathSegList, points.x, points.y, points.x1, points.y1, points.arcAngle, points.arcLarge, points.arcSweep)\n                case window.SVGPathSeg.PATHSEG_ARC_ABS:\n                    var points = {x1: this._parseNumber(), y1: this._parseNumber(), arcAngle: this._parseNumber(), arcLarge: this._parseArcFlag(), arcSweep: this._parseArcFlag(), x: this._parseNumber(), y: this._parseNumber()}\n                    return new window.SVGPathSegArcAbs(owningPathSegList, points.x, points.y, points.x1, points.y1, points.arcAngle, points.arcLarge, points.arcSweep)\n                default:\n                    throw \"Unknown path seg type.\"\n                }\n            }\n\n            const builder = new Builder()\n            const source = new Source(string)\n\n            if (!source.initialCommandIsMoveTo())\n                return []\n            while (source.hasMoreData()) {\n                const pathSeg = source.parseSegment()\n                if (!pathSeg)\n                    return []\n                builder.appendSegment(pathSeg)\n            }\n\n            return builder.pathSegList\n        }\n    }\n}())\n\n//      JointJS library (http://jointjs.com)\n//      (c) 2011-2014 client IO. http://client.io.\n\njoint.shapes.chart = {}\n\njoint.shapes.chart.Plot = joint.shapes.basic.Generic.extend({\n\n    markup: [\n        '<clipPath class=\"clip\"><rect/></clipPath>',\n        '<g class=\"rotatable\">',\n        '<g class=\"scalable\"></g>',\n        '<g class=\"background\"><rect/><text/></g>',\n        '<g class=\"axis\">',\n        '<g class=\"y-axis\"><path/><g class=\"ticks\"></g></g>',\n        '<g class=\"x-axis\"><path/><g class=\"ticks\"></g></g>',\n        '<g class=\"markings\"></g>',\n        '</g>',\n        '<g class=\"data\"><g class=\"series\"></g></g>',\n        '<g class=\"foreground\">',\n        '<rect/><text class=\"caption\"/><text class=\"subcaption\"/>',\n        '<g class=\"legend\"><g class=\"legend-items\"></g></g>',\n        '<line class=\"guideline x-guideline\" /><line class=\"guideline y-guideline\" />',\n        '</g>',\n        '</g>'\n    ].join(''),\n    tickMarkup: '<g class=\"tick\"><line/><text/></g>',\n    pointMarkup: '<g class=\"point\"><circle/><text/></g>',\n    barMarkup: '<path class=\"bar\"/>',\n    markingMarkup: '<g class=\"marking\"><rect/><text/></g>',\n    serieMarkup: '<g><clipPath class=\"serie-clip\"><rect/></clipPath><path/><g class=\"bars\"></g><g class=\"points\"></g></g>',\n    legendItemMarkup: '<g class=\"legend-item\"><circle/><text/></g>',\n\n    defaults: joint.util.deepSupplement({\n\n        type: 'chart.Plot',\n        attrs: {\n            '.data path': { fill: 'none', stroke: 'black' },\n            '.data .bars rect': { fill: 'none', stroke: 'black' },\n            '.background rect': { fill: 'white', stroke: '#e5e5e5', opacity: 1 },\n            '.background text': { fill: 'black', text: 'No data available.', ref: '.', 'ref-x': .5, 'ref-y': .5, 'text-anchor': 'middle', 'y-alignment': 'middle', display: 'none' },\n            '.foreground > rect': { fill: 'white', stroke: '#e5e5e5', opacity: 0, 'pointer-events': 'none' },\n            '.foreground .caption': { fill: 'black', text: '', ref: '.foreground > rect', 'ref-x': .5, 'ref-y': 10, 'text-anchor': 'middle', 'y-alignment': 'middle', 'font-size': 14 },\n            '.foreground .subcaption': { fill: 'black', text: '', ref: '.foreground > rect', 'ref-x': .5, 'ref-y': 23, 'text-anchor': 'middle', 'y-alignment': 'middle', 'font-size': 10 },\n            '.point': { display: 'inline-block' },\n            '.point circle': { r: 2, stroke: 'black', fill: 'black', opacity: .3 },\n            '.point text': { fill: 'black', 'font-size': 8, 'text-anchor': 'middle', display: 'none' },\n            '.axis path': { fill: 'none', stroke: 'black' },\n            '.axis .tick': { fill: 'none', stroke: 'black' },\n            '.y-axis .tick line': { fill: 'none', stroke: 'black', x2: 2, y2: 0, opacity: 1 },\n            '.x-axis .tick line': { fill: 'none', stroke: 'black', x2: 0, y2: -3, opacity: 1 },\n            '.y-axis .tick text': { fill: 'black', stroke: 'none', 'font-size': 10, 'text-anchor': 'end' },\n            '.x-axis .tick text': { fill: 'black', stroke: 'none', 'font-size': 10, 'text-anchor': 'middle' },\n            '.y-axis .tick text > tspan': { dy: '-.5em', x: -5 },\n            '.x-axis .tick text > tspan': { dy: '.5em', x: 0 },\n            '.axis .markings': { fill: 'black', stroke: 'none', 'fill-opacity': 1 },\n            '.axis .markings text': { fill: 'black', 'text-anchor': 'end', 'font-size': 10, dy: -5, dx: -5 },\n            '.guideline': { 'pointer-events': 'none', display: 'none' },\n            '.x-guideline': { stroke: 'black', visibility: 'hidden' },\n            '.y-guideline': { stroke: 'black', visibility: 'hidden' },\n            '.legend': { 'ref-x': 10, 'ref-y': 10 },\n            '.legend-item text': { fill: 'black', transform: 'translate(14, 0)', 'font-size': 11 },\n            '.legend-item circle': { r: 5, transform: 'translate(5,5)' },\n            '.legend-item': { cursor: 'pointer' },\n            '.legend-item.disabled circle': { fill: 'gray' },\n            '.legend-item.disabled text': { opacity: .5 }\n        }\n\n    }, joint.shapes.basic.Generic.prototype.defaults),\n\n    legendPosition: function(pos, opt) {\n\n        opt = opt || {}\n\n        this.trigger('batch:start');\n\n        // Clean up previous attributes first. Do it silently so that we don't unncessarilly trigger updates.\n        [\n            '.legend/ref-x',\n            '.legend/ref-y',\n            '.legend/ref-dx',\n            '.legend/ref-dy',\n            '.legend/x-alignment',\n            '.legend/y-alignment'\n        ].forEach(function(item) {\n            this.removeAttr(item, { silent: true })\n        }, this)\n\n        const padding = opt.padding || 10\n\n        const attrs = {\n\n            n: { '.legend': { 'ref-x': .5, 'x-alignment': -.5, 'ref-y': padding }},\n            ne: { '.legend': { 'ref-dx': -padding, 'x-alignment': -.999, 'ref-y': padding }},\n            e: { '.legend': { 'ref-dx': -padding, 'x-alignment': -.999, 'ref-y': .5, 'y-alignment': -.5 }},\n            se: { '.legend': { 'ref-dx': -padding, 'ref-dy': -padding, 'x-alignment': -.999, 'y-alignment': -.999 }},\n            s: { '.legend': { 'ref-x': .5, 'ref-dy': -padding, 'x-alignment': -.5, 'y-alignment': -.999 }},\n            sw: { '.legend': { 'ref-x': padding, 'ref-dy': -padding, 'y-alignment': -.999 }},\n            w: { '.legend': { 'ref-x': padding, 'ref-y': .5, 'y-alignment': -.5 }},\n            nw: { '.legend': { 'ref-x': padding, 'ref-y': padding }},\n            nnw: { '.legend': { 'ref-x': padding, 'ref-y': -padding, 'y-alignment': -.999 }},\n            nn: { '.legend': { 'ref-x': .5, 'ref-y': -padding, 'x-alignment': -.5, 'y-alignment': -.999 }},\n            nne: { '.legend': { 'ref-dx': -padding, 'ref-y': -padding, 'x-alignment': -.999, 'y-alignment': -.999 }},\n            nnee: { '.legend': { 'ref-dx': padding, 'ref-y': -padding, 'y-alignment': -.999 }},\n            nee: { '.legend': { 'ref-y': padding, 'ref-dx': padding }},\n            ee: { '.legend': { 'ref-dx': padding, 'ref-y': .5, 'y-alignment': -.5 }},\n            see: { '.legend': { 'ref-dx': padding, 'ref-dy': -padding, 'y-alignment': -.999 }},\n            ssee: { '.legend': { 'ref-dx': padding, 'ref-dy': padding }},\n            sse: { '.legend': { 'ref-dx': -padding, 'ref-dy': padding, 'x-alignment': -.999 }},\n            ss: { '.legend': { 'ref-x': .5, 'ref-dy': padding, 'x-alignment': -.5 }},\n            ssw: { '.legend': { 'ref-x': padding, 'ref-dy': padding }},\n            ssww: { '.legend': { 'ref-x': -padding, 'ref-dy': padding, 'x-alignment': -.999 }},\n            sww: { '.legend': { 'ref-x': -padding, 'ref-dy': -padding, 'x-alignment': -.999, 'y-alignment': -.999 }},\n            ww: { '.legend': { 'ref-x': -padding, 'ref-y': .5, 'x-alignment': -.999, 'y-alignment': -.5 }},\n            nww: { '.legend': { 'ref-x': -padding, 'ref-y': padding, 'x-alignment': -.999 }},\n            nnww: { '.legend': { 'ref-x': -padding, 'ref-y': -padding, 'x-alignment': -.999, 'y-alignment': -.999 }}\n        }\n\n        if (attrs[pos]) {\n            this.attr(attrs[pos])\n        }\n\n        this.trigger('batch:stop')\n    },\n\n    // Add point `p` as the last point to the serie identified by `serieName`. If `opt.maxLen` is set and\n    // the number of points in the serie is higher than `maxLen`, shift the data in the serie.\n    addPoint: function(p, serieName, opt) {\n\n        opt = opt || {}\n\n        let series = this.get('series')\n\n        const serieIndex = joint.util.toArray(series).findIndex(function(item) {\n            return item.name === serieName\n        })\n        if (serieIndex === -1) {\n            throw new Error(`Serie ${  serieName  } was not found.`)\n        }\n\n        // Clone the serie so that the normal Backbone mechanism for `set()` and `prev()` works as expected.\n        const serie = joint.util.cloneDeep(series[serieIndex])\n        serie.data.push(p)\n\n        if (Number.isFinite(opt.maxLen) && serie.data.length > opt.maxLen) {\n\n            serie.data.shift()\n        }\n\n        // Again, slice the array so that we don't alter the `series` array currently set.\n        series = series.slice()\n        series[serieIndex] = serie\n\n        this.set('series', series, opt)\n    },\n\n    // Return the last point in the serie identified by `serieName`.\n    lastPoint: function(serieName) {\n\n        const serie = joint.util.toArray(this.get('series')).find(function(item) {\n            return item && item.name === serieName\n        }).data\n\n        return serie[serie.length - 1]\n    },\n\n    // Return the first point in the serie identified by `serieName`.\n    firstPoint: function(serieName) {\n\n        return joint.util.toArray(this.get('series')).find(function(item) {\n            return item && item.name === serieName\n        }).data[0]\n    }\n})\n\njoint.shapes.chart.PlotView = joint.dia.ElementView.extend({\n\n    events: {\n\n        mousemove: 'onMouseMove',\n        mouseout: 'onMouseOut'\n    },\n\n    initialize: function() {\n\n        joint.dia.ElementView.prototype.initialize.apply(this, arguments)\n\n        this.listenTo(this.model, 'change:series change:interpolate change:padding change:canvas change:markings change:axis', function() { this.update() })\n\n        this.on('cell:pointerdown', this.onPointerDown, this)\n\n        // A list of disabled serie names. This is used when toggling series via the legend\n        // or programmatically.\n        this._disabledSeries = []\n    },\n\n    renderMarkup: function() {\n\n        joint.dia.ElementView.prototype.renderMarkup.apply(this, arguments)\n\n        // Cache important elements for faster access.\n        this.elDataClipPath = this.$('.clip')[0]\n        this.elDataClipPathRect = this.elDataClipPath.firstChild\n        this.elBackgroundRect = this.$('.background rect')[0]\n        this.elBackgroundText = this.$('.background text')[0]\n        this.elForeground = this.$('.foreground')[0]\n        this.elForegroundRect = this.$('.foreground rect')[0]\n        this.elDataSeries = this.$('.data .series')[0]\n        this.elYAxisPath = this.$('.y-axis path')[0]\n        this.elYAxisTicks = this.$('.y-axis .ticks')[0]\n        this.elXAxisPath = this.$('.x-axis path')[0]\n        this.elXAxisTicks = this.$('.x-axis .ticks')[0]\n        this.elMarkings = this.$('.axis .markings')[0]\n        this.elXGuideline = this.$('.x-guideline')[0]\n        this.elYGuideline = this.$('.y-guideline')[0]\n        this.elLegend = this.$('.legend')[0]\n        this.elLegendItems = this.$('.legend-items')[0]\n\n        // An SVG element for repeatable elements. This will be used as an original for future clones.\n        this.elTick = V(this.model.tickMarkup)\n        this.elMarking = V(this.model.markingMarkup)\n        this.elLegendItem = V(this.model.legendItemMarkup)\n        this.elPoint = V(this.model.pointMarkup)\n        this.elBar = V(this.model.barMarkup)\n        this.elSerie = V(this.model.serieMarkup)\n\n        // Create clip region for the chart area and for the markings as they could also be out\n        // of the clip region.\n        this.elDataClipPath.id = `clip_${  this.cid}`\n        V(this.$('.data')[0]).attr('clip-path', `url(#${  this.elDataClipPath.id  })`)\n        V(this.elMarkings).attr('clip-path', `url(#${  this.elDataClipPath.id  })`)\n    },\n\n    update: function() {\n\n        const series = this.filterSeries()\n\n        // Get statistics about the series.\n        this.calculateStats(series)\n\n        const size = this.model.get('size')\n        const {width} = size\n        const {height} = size\n\n        // Chart area.\n        this.canvas = joint.util.assign({\n            x: 0, y: 0,\n            width: width, height: height\n        }, this.model.get('canvas'))\n\n        // Padding. In theory, padding is not necessary as one can always set the canvas area\n        // directly. However, it is much more convenient to be able to set a padding only for\n        // a specific dimension(s) (top/right/bottom/left) and let the canvas alone.\n        // Note that it is always advisable to set `padding` for bar charts, otherwise\n        // some of the bars (or their parts - depending on the `align` option) won't be visible.\n        let padding\n        const defaultPadding = { top: 0, right: 0, bottom: 0, left: 0 }\n        const modelPadding = this.model.get('padding')\n        if (joint.util.isObject(modelPadding)) {\n\n            padding = joint.util.assign({}, defaultPadding, modelPadding)\n\n        } else if (modelPadding !== undefined) {\n            // The padding is assumed to be a number. In this case, compensate for the right/bottom coordinates\n            // automatically. So that if e.g. `padding` is `10`, the chart area is moved `10px` from the left\n            // and the width becomes `2*10px` less so that there is also `10px` padding from the right.\n            padding = { top: modelPadding, right: 2 * modelPadding, bottom: 2 * modelPadding, left: modelPadding }\n\n        } else {\n\n            padding = defaultPadding\n        }\n\n        this.canvas = g.rect(this.canvas).moveAndExpand(g.rect(padding.left, padding.top, -padding.right, -padding.bottom))\n\n        const viewRect = { x: 0, y: 0, width: width, height: height }\n\n        V(this.elDataClipPathRect).attr(viewRect)\n        V(this.elBackgroundRect).attr(viewRect)\n        V(this.elForegroundRect).attr(viewRect)\n\n\n        this.updateAxis()\n        this.updateMarkings()\n\n        if (this.isEmpty()) {\n            // No data available.\n            // Show the \"No data available\" label that is hidden by default.\n            $(this.elBackgroundText).show()\n\n        } else {\n\n            $(this.elBackgroundText).hide()\n        }\n\n        this.updateSeries(series)\n\n        this.updateLegend()\n\n        // Apply attrs.\n        joint.dia.ElementView.prototype.update.apply(this, arguments)\n    },\n\n    calculateStats: function(series) {\n\n        series = series || this.model.get('series')\n\n        const xValues = []\n        const yValues = []\n        // `xMap` maps x values to an array of series these x values appear in and the corresponding\n        // y values. This is useful when we want to, for a given x value, retriev all the corresponding\n        // y values from all the series this x value appeared in (especially useful in tooltips).\n        const xMap = {}\n        const yMap = {}\n\n        const bySerie = {}\n\n        joint.util.toArray(series).forEach(function(serie, idx) {\n\n            const stats = bySerie[serie.name || idx] || (bySerie[serie.name || idx] = {})\n\n            // Initial assumptions.\n            stats.decreasingX = true\n            stats.decreasingY = true\n            stats.nonDecreasingX = true\n            stats.nonDecreasingY = true\n\n            let prev   // Previous data point.\n\n            joint.util.forIn(serie.data, function(dp) {\n\n                stats.minX = stats.minX === undefined ? dp.x : Math.min(stats.minX, dp.x)\n                stats.maxX = stats.maxX === undefined ? dp.x : Math.max(stats.maxX, dp.x)\n                stats.minY = stats.minY === undefined ? dp.y : Math.min(stats.minY, dp.y)\n                stats.maxY = stats.maxY === undefined ? dp.y : Math.max(stats.maxY, dp.y)\n\n                if (prev) {\n                    stats.decreasingX = stats.decreasingX && dp.x < prev.x\n                    stats.decreasingY = stats.decreasingY && dp.y < prev.y\n                    stats.nonDecreasingX = stats.nonDecreasingX && dp.x >= prev.x\n                    stats.nonDecreasingY = stats.nonDecreasingY && dp.y >= prev.y\n                }\n\n                if (!xValues.includes(dp.x)) xValues.push(dp.x)\n                if (!yValues.includes(dp.y)) yValues.push(dp.y);\n\n                (xMap[dp.x] || (xMap[dp.x] = [])).push({ serie: serie, x: dp.x, y: dp.y });\n                (yMap[dp.y] || (yMap[dp.y] = [])).push({ serie: serie, x: dp.x, y: dp.y })\n\n                prev = dp\n            })\n        })\n\n        const axis = this.model.get('axis') || {}\n        const xAxis = axis['x-axis'] || {}\n        const yAxis = axis['y-axis'] || {}\n\n        this.stats = {\n            minX: xAxis.min === undefined ? xValues.reduce(function(min, item) {\n                return item < min ? item : min\n            }, Infinity) : xAxis.min,\n            maxX: xAxis.max === undefined ? xValues.reduce(function(max, item) {\n                return item > max ? item : max\n            }, -Infinity) : xAxis.max,\n            minY: yAxis.min === undefined ? yValues.reduce(function(min, item) {\n                return item < min ? item : min\n            }, Infinity) : yAxis.min,\n            maxY: yAxis.max === undefined ? yValues.reduce(function(max, item) {\n                return item > max ? item : max\n            }, -Infinity) : yAxis.max,\n            bySerie: bySerie,\n            xValues: xValues,\n            yValues: yValues,\n            xMap: xMap,\n            yMap: yMap\n        }\n    },\n\n    isEmpty: function() {\n\n        return !this.stats.xValues.length\n    },\n\n    updateSeries: function(series) {\n\n        series = series || this.model.get('series')\n\n        // Remove all the previously rendered series.\n        this.elDataSeries.textContent = ''\n\n        if (this.isEmpty()) return\n\n        const xDomain = [this.stats.minX, this.stats.maxX]\n        const yDomain = [this.stats.minY, this.stats.maxY]\n        const xRange = [this.canvas.x, this.canvas.x + this.canvas.width]\n        // Note how the `yRange` is inverted. This is because we render points from bottom to top.\n        const yRange = [this.canvas.y + this.canvas.height, this.canvas.y]\n\n        const attrs = this.model.get('attrs')\n\n        joint.util.toArray(series).forEach(function(serie, i) {\n\n            const points = serie.data\n            const transformedPoints = []\n\n            const elSerie = this.elSerie.clone().attr('class', serie.name || (`serie-${  i}`))\n            V(this.elDataSeries).append(elSerie)\n\n            joint.util.forIn(points, function(p) {\n\n                // Transform the data point to the chart area.\n                const x = g.scale.linear(xDomain, xRange, p.x)\n                const y = g.scale.linear(yDomain, yRange, p.y)\n\n                transformedPoints.push({ x: x, y: y })\n\n                // Set position of the point element circle and label.\n                // A little optimization: do not render the points if they're not turned on.\n                if (attrs['.point'] && attrs['.point'].display !== 'none') {\n\n                    this.renderPoint(p, serie)\n                }\n\n                if (serie.bars) {\n\n                    this.renderBar(p, serie)\n                }\n\n            }.bind(this))\n\n            // Clip the serie path in order to clip the helper continuation of the path\n            // that is used to close the path for filling. (see `fixPathForFill()`).\n            const elSeriePathClip = elSerie.findOne('.serie-clip')\n\n            const size = this.model.get('size')\n            const stats = this.stats.bySerie[serie.name || i]\n            const minX = g.scale.linear(xDomain, xRange, stats.minX)\n            const maxX = g.scale.linear(xDomain, xRange, stats.maxX)\n\n            const elSeriePathClipRect = elSeriePathClip.findOne('rect')\n            elSeriePathClipRect.attr(g.rect(minX, 0, maxX - minX, size.height))\n\n            if (!serie.bars) {\n                // Bars were already rendered for each data point.\n\n                const elSeriePath = elSerie.findOne('path')\n                elSeriePath.attr({\n                    d: this.seriePathData(transformedPoints, serie, i),\n                    'clip-path': `url(#${  elSeriePathClip.node.id  })`\n                })\n            }\n\n        }, this)\n    },\n\n    seriePathClipData: function(points, serie) {\n\n        const padding = 10\n        const size = this.model.get('size')\n        const firstPoint = points[0]\n        const d = ['M', firstPoint.x, firstPoint.y, 'V', size.height + padding]\n        return d.join(' ')\n    },\n\n    renderBar: function(p, serie) {\n\n        const xDomain = [this.stats.minX, this.stats.maxX]\n        const yDomain = [this.stats.minY, this.stats.maxY]\n        const xRange = [this.canvas.x, this.canvas.x + this.canvas.width]\n        // Note how the `yRange` is inverted. This is because we render points from bottom to top.\n        const yRange = [this.canvas.y + this.canvas.height, this.canvas.y]\n\n        // Transform the data point to the chart area.\n        const x = g.scale.linear(xDomain, xRange, p.x)\n        const y = g.scale.linear(yDomain, yRange, p.y)\n\n        const definedBarWidth = serie.bars.barWidth || .8\n        const barWidth = definedBarWidth > 1 ? definedBarWidth : (this.canvas.width / (this.stats.maxX - this.stats.minX)) * definedBarWidth\n        const barHeight = g.scale.linear(yDomain, yRange, 0) - y\n\n        // `rx` values can be defined either directly in the data point for a specific bar\n        // or on the `serie` object for all the bars.\n        const topRx = p['top-rx'] || serie.bars['top-rx']\n        const topRy = p['top-ry'] || serie.bars['top-ry']\n        const bottomRx = p['bottom-rx'] || serie.bars['bottom-rx']\n        const bottomRy = p['bottom-ry'] || serie.bars['bottom-ry']\n\n        // Alignment of the bar against the x coordinate. `'left'` is the default.\n        const barX = ({\n\n            left: x,\n            middle: x - barWidth / 2,\n            right: x - barWidth\n\n        })[serie.bars.align || 'middle']\n\n        const elBar = this.elBar.clone()\n        elBar.attr({\n            'data-serie': serie.name,\n            'data-x': p.x,\n            'data-y': p.y,\n            d: V.rectToPath({ x: barX, y: y, width: barWidth, height: barHeight, 'top-rx': topRx, 'top-ry': topRy, 'bottom-rx': bottomRx, 'bottom-ry': bottomRy })\n        })\n\n        const serieSelector = serie.name || (`serie-${  this.model.get('series').indexOf(serie)}`)\n        V(this.elDataSeries).findOne(`.${  serieSelector  } .bars`).append(elBar)\n\n        return elBar.node\n    },\n\n    renderPoint: function(p, serie) {\n\n        const xDomain = [this.stats.minX, this.stats.maxX]\n        const yDomain = [this.stats.minY, this.stats.maxY]\n        const xRange = [this.canvas.x, this.canvas.x + this.canvas.width]\n        // Note how the `yRange` is inverted. This is because we render points from bottom to top.\n        const yRange = [this.canvas.y + this.canvas.height, this.canvas.y]\n\n        // Transform the data point to the chart area.\n        const x = g.scale.linear(xDomain, xRange, p.x)\n        const y = g.scale.linear(yDomain, yRange, p.y)\n\n        const elPoint = this.elPoint.clone()\n        elPoint.attr({\n            'data-serie': serie.name,\n            'data-x': p.x,\n            'data-y': p.y\n        })\n        elPoint.findOne('circle').attr({ cx: x, cy: y })\n        elPoint.findOne('text').attr({ x: x, dy: y }).text(this.pointLabel(p, serie))\n\n        const serieSelector = serie.name || (`serie-${  this.model.get('series').indexOf(serie)}`)\n        V(this.elDataSeries).findOne(`.${  serieSelector  } .points`).append(elPoint)\n\n        return elPoint.node\n    },\n\n    // Construct an SVG path for the data points. Use interpolation if desired.\n    seriePathData: function(points, serie, idx) {\n\n        const interpolate = serie.interpolate === undefined ? this.model.get('interpolate') : serie.interpolate\n        let d\n        let i\n        let p\n        const pointsLength = points.length\n\n        switch (interpolate) {\n\n            case 'bezier':\n                d = new g.Path(g.Curve.throughPoints(points)).serialize()\n                break\n\n            case 'step':\n                p = points[0]\n                d = ['M', p.x, p.y]\n                for (i = 1; i < pointsLength; i++) {\n                    d.push('H', (p.x + points[i].x) / 2, 'V', points[i].y)\n                    p = points[i]\n                }\n                break\n\n            case 'stepBefore':\n                d = ['M', points[0].x, points[0].y]\n                for (i = 1; i < pointsLength; i++) {\n                    d.push('V', points[i].y, 'H', points[i].x)\n                }\n                break\n\n            case 'stepAfter':\n                d = ['M', points[0].x, points[0].y]\n                for (i = 1; i < pointsLength; i++) {\n                    d.push('H', points[i].x, 'V', points[i].y)\n                }\n                break\n\n            default:        // linear\n                d = ['M']\n                for (i = 0; i < pointsLength; i++) {\n                    d.push(points[i].x, points[i].y)\n                }\n                break\n        }\n\n        d = this.fixPathForFill(d, points, serie, idx)\n\n        return d.join(' ')\n    },\n\n    fixPathForFill: function(d, points, serie, idx) {\n\n        // Nothing needs to be fixed for empty points list.\n        if (points.length === 0) return d\n\n        // If the serie is not non-decreasing (it is an arbitrary function), it is assumed that\n        // the author knows what he's doing and handles proper fill himself.\n        const stats = this.stats.bySerie[serie.name || idx]\n        if (!stats.nonDecreasingX) return d\n\n        const padding = 10\n        const size = this.model.get('size')\n        const firstPoint = points[0]\n        const lastPoint = points[points.length - 1]\n\n        // Start a subpath at the level of the last point of the serie but below the visible chart area\n        // (i.e. below the clipped region) and continue that path to the level of the first point circling\n        // around the bottom of the clipping region. This makes sure that even though the serie\n        // has its last x point before another serie in the chart and fill is set on the serie SVG path element\n        // the fill will properly fill the region below the serie path. This is nicely visible\n        // if you comment out the setting of the `clip-path` attribute on the `.data` group.\n        const dPrefix = ['M', lastPoint.x, size.height + padding, 'H', firstPoint.x - padding, 'V', firstPoint.y]\n        // The first path command is assumed to be `'M'`. Due to the trick\n        // to fully support a proper fill, there is already preceeding a subpath.\n        // Therefore, we want to continue that subpath with a line command.\n        d[0] = 'L'\n\n        return dPrefix.concat(d)\n    },\n\n    updateAxis: function() {\n\n        const size = this.model.get('size')\n        const {width} = size\n        const {height} = size\n\n        const axis = this.model.get('axis')\n\n        // The canvas could be larger or smaller than the actual height of the chart view.\n        // This can happen when the chart is zoomed. However, we still want to render the\n        // axis along the height of the chart view (not continueing it below or above).\n        // The `canvasHeighRatio` helps us adjust the range to which we map the values\n        // from the axis domain.\n        const canvasHeightRatio = this.canvas.height / height\n\n        // Axis line.\n        V(this.elYAxisPath).attr('d', ['M', 0, 0, 'L', 0, height].join(' '))\n        V(this.elXAxisPath).attr('d', ['M', 0, height, 'L', width, height].join(' '))\n\n        // Clean up old ticks.\n        this.elXAxisTicks.textContent = ''\n        this.elYAxisTicks.textContent = ''\n\n        if (this.isEmpty()) return\n\n        const xDomain = [this.stats.minX, this.stats.maxX]\n        const yDomain = [this.stats.minY, this.stats.maxY]\n        const xRange = [this.canvas.x, this.canvas.x + this.canvas.width]\n        const yRange = [0, this.canvas.height]\n        const yDomainSpan = yDomain[1] - yDomain[0]\n        const yAxis = axis && axis['y-axis'] || {}\n        const xAxis = axis && axis['x-axis'] || {}\n\n        // Number of ticks. If the length of the domain interval is zero, show at least one tick.\n        const ticks = (yDomainSpan) > 0 ? (yAxis.ticks - 1 || 10) : 0\n        // A tick step. We must scale the tick step down by the `canvasHeightRatio`.\n        // The tick step becomes smaller if the canvas is larger than the chart view and bigger otherwise.\n        const tickStep = (yDomainSpan / ticks) / canvasHeightRatio\n\n        // Render ticks.\n        // Start at `yDomain[0]` and step by `tickStep` `ticks` number of times.\n        let y = yDomain[0]\n\n        for (let i = 0; i < ticks + 1; i++) {\n\n            const ty = g.scale.linear(yDomain, yRange, y)\n\n            const elTick = this.elTick.clone()\n            elTick.translate(0, ty)\n            V(this.elYAxisTicks).append(elTick)\n\n            // Invert the `y` value according to the domain as we're moving from top to bottom but\n            // the axis ticks are labeled from bottom to top.\n            let tickValue = yDomain[1] - (y - yDomain[0])\n            // The `tickValue` is shifted by the `canvas.y` offset but first we must scale this offset\n            // back to the domain of the axis.\n            tickValue += g.scale.linear(yRange, yDomain, this.canvas.y) - yDomain[0]\n\n            elTick.findOne('text').text(this.tickLabel(tickValue, yAxis))\n\n            y += tickStep\n        }\n        this.stats.xValues.forEach(function(x, i) {\n\n            // Show only every `tickStep` value. Default is to show all the `x` values.\n            if (i % (xAxis.tickStep || 1) !== 0) return\n\n            const tx = g.scale.linear(xDomain, xRange, x)\n\n            // Do not show ticks that are outside the chart view area.\n            if (tx > width) return\n\n            const elTick = this.elTick.clone()\n            elTick.translate(tx, height)\n            V(this.elXAxisTicks).append(elTick)\n\n            elTick.findOne('text').text(this.tickLabel(x, xAxis))\n\n        }, this)\n    },\n\n    tickLabel: function(value, opt) {\n\n        if (joint.util.isFunction(opt.tickFormat)) {\n\n            return opt.tickFormat(value)\n        }\n\n        const formatSpecifier = opt.tickFormat || '.1f'\n        const label = joint.util.format.number(formatSpecifier, value)\n        return label + (joint.util.isFunction(opt.tickSuffix) ? opt.tickSuffix(value) : (opt.tickSuffix || ''))\n    },\n\n    pointLabel: function(p, opt) {\n\n        if (joint.util.isFunction(opt.pointFormat)) {\n\n            return opt.pointFormat(p)\n        }\n\n        const formatSpecifier = opt.pointFormat || '.1f'\n        const label = joint.util.format.number(formatSpecifier, p.y)\n        return label + (opt.pointSuffix || '')\n    },\n\n    updateMarkings: function() {\n\n        // Clean up old markings.\n        this.elMarkings.textContent = ''\n\n        const markings = this.model.get('markings')\n        // No need to continue if there are no markings.\n        if (!markings || markings.length === 0) return\n\n        const size = this.model.get('size')\n        const {width} = size\n        const {height} = size\n\n        const xDomain = [this.stats.minX, this.stats.maxX]\n        const yDomain = [this.stats.minY, this.stats.maxY]\n        let xRange = [this.canvas.x, this.canvas.x + this.canvas.width]\n        let yRange = [this.canvas.y, this.canvas.y + this.canvas.height]\n\n        function firstDefined(a, b) {\n            return a === undefined ? b : a\n        }\n\n        joint.util.toArray(markings).forEach(function(marking, i) {\n\n            // Start and end of the marking. The following adjustments makes it\n            // easier to define the marking. It does not really matter if the `end`\n            // is before `start`. Also, if the only thing defined is `start.y`, the marking\n            // will be a single line starting at that `y` position crossing the whole chart.\n            const start = marking.start || marking.end\n            const end = marking.end || marking.start\n\n            const startX = Math.min(firstDefined(start.x, this.stats.minX), firstDefined(end.x, this.stats.minX))\n            const endX = Math.max(firstDefined(start.x, this.stats.maxX), firstDefined(end.x, this.stats.maxX))\n            const startY = Math.min(firstDefined(start.y, this.stats.minY), firstDefined(end.y, this.stats.minY))\n            const endY = Math.max(firstDefined(start.y, this.stats.maxY), firstDefined(end.y, this.stats.maxY))\n\n            // Scale `start` and `end` to use for translating the marking rectangle.\n\n            // If the marking is a trendline, i.e. one of the coordinates is missing,\n            // (in other words the marking is not an area), we want such line to\n            // cover the whole view regardless of the canvas area. The reasoning behind\n            // this is that, for example, if we have a bar chart and some of the bars\n            // are rendered after the canvas area and we can compensate for this by\n            // setting a padding on the canvas area, we still want the trendlines\n            // to be rendered for those bars.\n            const isTrendLineX = start.x === undefined || end.x === undefined\n            const isTrendLineY = start.y === undefined || end.y === undefined\n\n            if (isTrendLineX) xRange = [0, width]\n            if (isTrendLineY) yRange = [0, height]\n\n            const startTx = g.scale.linear(xDomain, xRange, startX)\n            const endTx = g.scale.linear(xDomain, xRange, endX)\n            const startTy = g.scale.linear(yDomain, yRange, startY)\n            const endTy = g.scale.linear(yDomain, yRange, endY)\n\n            // Marking position and dimensions.\n            const mx = startTx\n            const my = yRange[1] - endTy + yRange[0]\n            let mw = endTx - startTx\n            let mh = endTy - startTy\n\n            // Limit the marking to the bounding box of the canvas.\n            //if (mx + mw > this.canvas.width + this.canvas.x) mw = this.canvas.width + this.canvas.x - mx;\n            //if (my + mh > this.canvas.height + this.canvas.y) mh = this.canvas.height + this.canvas.y - my;\n\n            // Make sure we give the marking a positive width and height, otherwise it's not visible at all.\n            mw = Math.max(mw, 1)\n            mh = Math.max(mh, 1)\n\n            // Render the marking.\n            const elMarking = this.elMarking.clone()\n            elMarking.findOne('rect').attr({ x: mx, y: my, width: mw, height: mh })\n            elMarking.findOne('text').text(marking.label || '').attr({ x: mx + mw, y: my })\n            const className = `${elMarking.attr('class')  } ${  marking.name || (`marking-${  i}`)}`\n            elMarking.attr(joint.util.assign({ class: className }, marking.attrs))\n            V(this.elMarkings).append(elMarking)\n\n        }, this)\n    },\n\n    updateLegend: function() {\n\n        const series = this.model.get('series')\n\n        this.elLegendItems.textContent = ''\n\n        joint.util.toArray(series).forEach(function(serie, i) {\n\n            // Give the outside world the ability to decide whether a legend item should be shown or not.\n            if (joint.util.isFunction(serie.showLegend) && !serie.showLegend(serie, this.stats.bySerie[serie.name || i])) {\n\n                return\n\n            } else if (serie.showLegend === false) {\n\n                return\n            }\n\n            const elLegendItem = this.elLegendItem.clone()\n            if (this._disabledSeries.includes(serie.name)) {\n                elLegendItem.addClass('disabled')\n            }\n            elLegendItem.attr('data-serie', serie.name)\n            elLegendItem.findOne('circle').attr({ fill: this.getSerieColor(serie.name) })\n            elLegendItem.findOne('text').text(serie.label || serie.name)\n            elLegendItem.translate(0, i * (serie.legendLabelLineHeight || 16))\n            V(this.elLegendItems).append(elLegendItem)\n\n        }, this)\n    },\n\n    getSerieColor: function(serieName) {\n\n        const attrs = this.model.get('attrs')\n\n        const serieAttrs = Object.keys(attrs).find(function(selector) {\n            return selector.includes(serieName)\n        })\n\n        return serieAttrs ? attrs[serieAttrs].stroke || attrs[serieAttrs].fill : 'black'\n    },\n\n    hideSerie: function(serieName) {\n\n        if (!this._disabledSeries.includes(serieName)) {\n            this._disabledSeries.push(serieName)\n        }\n\n        const series = this.filterSeries()\n        this.update(series)\n    },\n\n    showSerie: function(serieName) {\n\n        this._disabledSeries = joint.util.without(this._disabledSeries, serieName)\n\n        const series = this.filterSeries()\n        this.update(series)\n    },\n\n    filterSeries: function(series) {\n\n        series = series || this.model.get('series')\n\n        series = joint.util.toArray(series).filter(function(serie) {\n            return !this._disabledSeries.includes(serie.name)\n        }, this)\n\n        return series\n    },\n\n    // Interaction.\n    // ------------\n\n    onPointerDown: function(evt, x, y) {\n\n        const elLegendItem = $(evt.target).closest('.legend-item')[0]\n        if (elLegendItem) {\n\n            V(elLegendItem).toggleClass('disabled')\n\n            if (V(elLegendItem).hasClass('disabled')) {\n\n                this.hideSerie(V(elLegendItem).attr('data-serie'))\n\n            } else {\n\n                this.showSerie(V(elLegendItem).attr('data-serie'))\n            }\n        }\n    },\n\n    onMouseMove: function(evt) {\n\n        this.showGuidelines(evt.clientX, evt.clientY, evt)\n    },\n\n    onMouseOut: function(evt) {\n\n        this.hideGuidelines()\n        this.trigger('mouseout', evt)\n    },\n\n    showGuidelines: function(clientX, clientY, evt) {\n\n        const angle = this.model.get('angle')\n        const bbox = this.model.getBBox()\n        const localPoint = g.point(V(this.paper.viewport).toLocalPoint(clientX, clientY)).rotate(bbox.center(), angle)\n\n        if (g.rect(bbox).containsPoint(localPoint)) {\n\n            const size = this.model.get('size')\n\n            const x = localPoint.x - bbox.x\n            const y = localPoint.y - bbox.y\n\n            V(this.elXGuideline).attr({ x1: x, y1: 0, x2: x, y2: size.height, visibility: 'visible' })\n            V(this.elYGuideline).attr({ x1: 0, y1: y, x2: size.width, y2: y, visibility: 'visible' })\n\n            const dataX = g.scale.linear([this.canvas.x, this.canvas.x + this.canvas.width], [this.stats.minX, this.stats.maxX], x)\n            const dataY = g.scale.linear([this.canvas.y, this.canvas.y + this.canvas.height], [this.stats.minY, this.stats.maxY], y)\n\n            const dataPoint = { x: dataX, y: this.stats.minY + this.stats.maxY - dataY }\n            const clientPoint = { x: clientX, y: clientY }\n            const closestPoints = this.closestPoints(dataX)\n\n            this.trigger('mouseover', dataPoint, clientPoint, closestPoints, evt)\n        }\n    },\n\n    // Return the closest points for a given `x` value. The returned array contains objects\n    // with `x` and `y` values and a `serie` object this `x` value appeared in.\n    closestPoints: function(x) {\n\n        const xValuesIndex = joint.util.sortedIndex(this.stats.xValues, x)\n\n        const xValue = this.stats.xValues[xValuesIndex]\n        const xValueBefore = this.stats.xValues[xValuesIndex - 1]\n\n        const xClosest = xValueBefore === undefined ? xValue : (Math.abs(x - xValue) < Math.abs(x - xValueBefore) ? xValue : xValueBefore)\n\n        return this.stats.xMap[xClosest]\n    },\n\n    hideGuidelines: function() {\n\n        V(this.elXGuideline).attr('visibility', 'hidden')\n        V(this.elYGuideline).attr('visibility', 'hidden')\n    }\n})\n\njoint.shapes.chart.Pie = joint.shapes.basic.Generic.extend({\n\n    markup: [\n        '<g class=\"rotatable\">',\n        '<g class=\"scalable\"></g>',\n        '<g class=\"background\"><rect/><text/></g>',\n        '<g class=\"data\"></g>',\n        '<g class=\"foreground\">',\n        '<rect/><text class=\"caption\"/><text class=\"subcaption\"/>',\n        '<g class=\"legend\"><g class=\"legend-items\"></g></g>',\n        '</g>',\n        '</g>'\n    ].join(''),\n\n    sliceMarkup: '<g class=\"slice\"/>',\n    sliceFillMarkup: '<path class=\"slice-fill\"/>',\n    sliceBorderMarkup: '<path class=\"slice-border\"/>',\n    sliceInnerLabelMarkup: '<text class=\"slice-inner-label\"/>',\n    legendSerieMarkup: '<g class=\"legend-serie\"><text/></g>',\n    legendSliceMarkup: '<g class=\"legend-slice\"><circle/><text/></g>',\n\n    defaults: joint.util.deepSupplement({\n\n        type: 'chart.Pie',\n        size: { width: 200, height: 200 },\n\n        // work only on first (or alone) serie\n        pieHole: 0,\n\n        // serieDefaults.startAngle: pie is draw clockwise from est (right)\n        serieDefaults: {\n            startAngle: 0,\n            degree: 360,\n            label: null,\n            showLegend: true,\n            labelLineHeight: 6\n        },\n\n        // onClickEffect/onHoverEffect: effect on click/mouseOver (see this.effectOnSlice for a list and option, ex. onHoverEffect: {type: 'enlarge', scale: 1.05})\n        sliceDefaults: {\n            innerLabel: '{percentage:.0f}%',\n            innerLabelMargin: 6,\n            legendLabel: '{label}: {value}',\n            legendLabelLineHeight: 6,\n            legendLabelMargin: 14,\n            offset: 0,\n            onClickEffect: { type: 'offset', offset: 20 },\n            onHoverEffect: null\n        },\n\n        series: [],\n\n        attrs: {\n            '.background > rect': { opacity: 0 },\n            '.background > text': { fill: 'black', text: 'No data available.', ref: '.background > rect', 'ref-x': .5, 'ref-y': .5, 'text-anchor': 'middle', 'y-alignment': 'middle', display: 'none' },\n            '.foreground > rect': { fill: 'white', stroke: '#e5e5e5', opacity: 0, 'pointer-events': 'none' },\n            '.foreground .caption': { fill: 'black', text: '', ref: '.foreground > rect', 'ref-x': 2, 'ref-y': 6, 'text-anchor': 'start', 'y-alignment': 'middle', 'font-size': 14 },\n            '.foreground .subcaption': { fill: 'black', text: '', ref: '.foreground > rect', 'ref-x': 2, 'ref-y': 18, 'text-anchor': 'start', 'y-alignment': 'middle', 'font-size': 10 },\n            '.data': { ref: '.background', 'ref-x': .5, 'ref-y': .5 },\n            '.slice': { cursor: 'pointer' },\n            '.slice > .slice-fill': { stroke: '#ffffff', 'stroke-width': 1, 'fill-opacity': 1 },\n            '.slice.hover > .slice-fill': { 'fill-opacity': .8 },\n            '.slice > .slice-border': { 'stroke-width': 6, 'stroke-opacity': .4, 'fill-opacity': 1, fill: 'none', display: 'none' },\n            '.slice.hover > .slice-border': { display: 'block' },\n            '.slice > .slice-inner-label': { 'text-anchor': 'middle', 'font-size': '12', stroke: 'none', 'stroke-width': '0', fill: '#ffffff' },\n            '.slice > .slice-inner-label > tspan': { dy: '-.5em' },\n            '.legend': { 'ref-dx': 20, 'ref-y': 5 },\n            '.legend-serie text': { fill: 'grey', transform: 'translate(2, 0)', 'font-size': 13 },\n            '.legend-slice': { cursor: 'pointer' },\n            '.legend-slice text': { 'font-weight': 'normal', fill: 'black', 'font-size': 11 },\n            '.legend-slice.hover text': { 'font-weight': 'bold' },\n            '.legend-slice circle': { r: 5, transform: 'translate(5,5)' }\n        }\n\n    }, joint.shapes.basic.Generic.prototype.defaults),\n\n    addSlice: function(slice, serieIndex, opt) {\n\n        opt = opt || {}\n        serieIndex = serieIndex || 0\n\n        let series = this.get('series')\n\n        // If serie is undefinied (first slice added to serie)\n        if (series[serieIndex] === undefined) series[serieIndex] = { data: [] }\n\n        // Clone the serie so that the normal Backbone mechanism for `set()` and `prev()` works as expected.\n        const serie = joint.util.cloneDeep(series[serieIndex])\n        serie.data.push(slice)\n\n        // Again, slice the array so that we don't alter the `series` array currently set.\n        series = series.slice()\n        series[serieIndex] = serie\n\n        // If it's a new serie (first slice added)\n        opt = serie.data.length > 1 ? joint.util.assign(opt, { changedSerieIndex: serieIndex }) : opt\n\n        // Set in opt the serieIndex that change for update only serieIndex on view (could it be better?)\n        this.set('series', series, opt)\n    },\n\n    editSlice: function(slice, sliceIndex, serieIndex, opt) {\n\n        opt = opt || {}\n        serieIndex = serieIndex || 0\n\n        let series = this.get('series')\n\n        if (series[serieIndex] === undefined || series[serieIndex].data[sliceIndex] === undefined) {\n            throw new Error(`Slice ${  sliceIndex  } on serie ${  serieIndex  } was not found.`)\n        }\n\n        // Clone the serie so that the normal Backbone mechanism for `set()` and `prev()` works as expected.\n        const serie = joint.util.cloneDeep(series[serieIndex])\n        serie.data[sliceIndex] = joint.util.assign(serie.data[sliceIndex], slice)\n\n        // Again, slice the array so that we don't alter the `series` array currently set.\n        series = series.slice()\n        series[serieIndex] = serie\n\n        this.set('series', series, joint.util.assign(opt, { changedSerieIndex: serieIndex }))\n    }\n})\n\njoint.shapes.chart.PieView = joint.dia.ElementView.extend({\n\n    events: {\n        'mouseover .slice': 'onMouseOverSlice',\n        'mouseout .slice': 'onMouseOverSlice',\n        'mousemove .slice': 'onMouseMoveSlice',\n        'mouseover .legend-slice': 'onEventLegendItem',\n        'mouseout .legend-slice': 'onEventLegendItem'\n    },\n\n    initialize: function() {\n\n        joint.dia.ElementView.prototype.initialize.apply(this, arguments)\n\n        // Little optimization that update only the serie changed\n        this.listenTo(this.model, 'change:series change:serieDefaults change:sliceDefaults change:pieHole',\n            function(model, attr, opt) {\n                this.update(null, null, null, opt.changedSerieIndex)\n            })\n\n        this.on('cell:pointerclick', this.onClickSlice, this)\n        this.on('cell:pointerclick', this.onEventLegendItem, this)\n    },\n\n    renderMarkup: function() {\n\n        joint.dia.ElementView.prototype.renderMarkup.apply(this, arguments)\n\n        // Cache important elements for faster access.\n        this.elBackgroundRect = this.$('.background rect')[0]\n        this.elBackgroundText = this.$('.background text')[0]\n\n        this.elForegroundRect = this.$('.foreground rect')[0]\n\n        this.elLegendItems = this.$('.legend-items')[0]\n\n        this.elPie = this.$('.data')[0]\n\n        // An SVG element for repeatable elements. This will be used as an original for future clones.\n        this.elSlice = V(this.model.sliceMarkup)\n        this.elSliceFill = V(this.model.sliceFillMarkup)\n        this.elSliceBorder = V(this.model.sliceBorderMarkup)\n        this.elSliceInnerLabel = V(this.model.sliceInnerLabelMarkup)\n\n        this.elLegendSerie = V(this.model.legendSerieMarkup)\n        this.elLegendSlice = V(this.model.legendSliceMarkup)\n    },\n\n    update: function(cell, renderingOnlyAttrs, opt, serieIndex) {\n\n        const series = this.calculateSeries(serieIndex)\n\n        if (serieIndex in series) {\n            // Remove only the serieIndex for which is request update\n            $(this.elPie).find(`.serie-${  serieIndex}`).remove()\n        } else {\n            // Remove all the previously rendered series.\n            $(this.elPie).empty()\n        }\n\n        const size = this.model.get('size')\n        V(this.elBackgroundRect).attr(size)\n        V(this.elForegroundRect).attr(size)\n\n        if (!series.length) {\n            // No data available.\n            // Show the \"No data available\" label that is hidden by default.\n            $(this.elBackgroundText).show()\n        } else {\n            $(this.elBackgroundText).hide()\n        }\n\n        joint.util.toArray(series).forEach(function(serie, index) {\n            // Use serieIndex for update only the requested serie\n            if (serieIndex !== undefined && serieIndex !== index) return\n\n            joint.util.forIn(serie.data, this.updateSlice.bind(this))\n        }, this)\n\n        this.updateLegend()\n\n        // Apply attrs.\n        joint.dia.ElementView.prototype.update.apply(this, arguments)\n    },\n\n    calculateSeries: function(serieIndex) {\n\n        const series = joint.util.cloneDeep(this.model.get('series'))\n\n        const serieDefaults = this.model.get('serieDefaults')\n        const sliceDefaults = this.model.get('sliceDefaults')\n\n        // Pie outer radius less margin\n        const size = this.model.get('size')\n        const radius = Math.min(size.width, size.height) / 2\n\n        let pieHole = this.model.get('pieHole')\n        pieHole = pieHole > 1 ? pieHole : radius * pieHole\n\n        let outerRadius = radius\n        const radiusStep = (radius - pieHole) / series.length\n\n        this._series = series.map(function(serie, index) {\n\n            // Use serieIndex for update only the selected serie\n            if (serieIndex !== undefined && serieIndex !== index) return serie\n\n            serie = joint.util.defaults(serie, serieDefaults)\n\n            let {startAngle} = serie\n\n            // Calculate percentage of each slice\n            const total = serie.data.reduce(function(sum, slice) {\n                return sum + slice.value\n            }, 0)\n            const circleDividedByTotal = serie.degree / total || 0\n            const percentageDividedByTotal = 100 / total\n\n            serie.data = serie.data.map(function(slice, sliceIndex) {\n\n                // Init default params for all slice (less some attributes valid only for outer slice)\n                slice = joint.util.defaults(slice, joint.util.omit(sliceDefaults, 'offset', 'onClickEffect', 'onHoverEffect'))\n\n                slice.outerRadius = outerRadius\n                slice.innerRadius = outerRadius - radiusStep\n\n                // For outer slice\n                if (!index) {\n                    // Init default params for outer slice\n                    slice = joint.util.defaults(slice, joint.util.pick(sliceDefaults, 'offset', 'onClickEffect', 'onHoverEffect'))\n\n                    slice.isOuter = true\n                    slice.offset = slice.offset > 1 ? slice.offset : slice.offset * slice.outerRadius\n                    slice.onClickEffect.offset = slice.onClickEffect.offset > 1 ? slice.onClickEffect.offset : slice.onClickEffect.offset * slice.outerRadius\n                }\n\n                slice.serieIndex = index\n                slice.sliceIndex = sliceIndex\n                slice.innerLabelMargin = (slice.innerLabelMargin < -1 || slice.innerLabelMargin > 1) ? slice.innerLabelMargin : slice.innerLabelMargin * slice.outerRadius\n                slice.percentage = slice.value * percentageDividedByTotal\n\n                const angle = slice.value * circleDividedByTotal\n\n                slice.degree = {\n                    angle: angle,\n                    start: startAngle,\n                    end: angle + startAngle\n                }\n\n                slice.rad = {\n                    angle: g.toRad(slice.degree.angle, true),\n                    start: g.toRad(slice.degree.start, true),\n                    end: g.toRad(slice.degree.end, true)\n                }\n\n                slice.middleangle = (slice.rad.start + slice.rad.end) / 2\n\n                startAngle = slice.degree.end\n\n                return slice\n            })\n\n            outerRadius -= radiusStep\n\n            return serie\n        })\n\n        return this._series\n    },\n\n    updateLegend: function() {\n\n        const series = this._series\n\n        this.elLegendItems.textContent = ''\n\n        let xPadding = 0\n        const fontSizeLegendSerieText = parseInt(this.model.attr('.legend-serie text/font-size'), 10)\n        const fontSizeLegendSliceText = parseInt(this.model.attr('.legend-slice text/font-size'), 10)\n\n        joint.util.toArray(series).forEach(function(serie, serieIndex) {\n\n            if (!serie.showLegend) return\n\n            // Append Serie label\n            if (serie.label) {\n                const elLegendSerie = this.elLegendSerie.clone()\n\n                if (serie.name) elLegendSerie.addClass(serie.name)\n                elLegendSerie.attr({ 'data-serie': serieIndex })\n\n                elLegendSerie.findOne('text').text(serie.label)\n                elLegendSerie.translate(0, xPadding)\n\n                V(this.elLegendItems).append(elLegendSerie)\n\n                // 1.5 is the proportional space between the legend items (one and half height of item)\n                xPadding += (fontSizeLegendSerieText + serie.labelLineHeight)\n            }\n\n            // Append Slices\n            joint.util.forIn(serie.data, function(slice, sliceIndex) {\n\n                const elLegendSlice = this.elLegendSlice.clone()\n\n                const slicefillColor = this.getSliceFillColor(sliceIndex, serieIndex)\n\n                if (slice.name) elLegendSlice.addClass(slice.name)\n                elLegendSlice.attr({ 'data-serie': serieIndex, 'data-slice': sliceIndex })\n\n                elLegendSlice.findOne('text').text(joint.util.format.string(slice.legendLabel, slice))\n                elLegendSlice.findOne('text').translate(slice.legendLabelMargin)\n                elLegendSlice.translate(0, xPadding)\n\n                // 1.5 is the proportional space between the legend items (one and half height of item)\n                xPadding += (fontSizeLegendSliceText + slice.legendLabelLineHeight)\n\n                // is a gradient\n                if (joint.util.isObject(slicefillColor)) {\n                    this.applyGradient(elLegendSlice.findOne('circle'), 'fill', slicefillColor)\n                } else {\n                    elLegendSlice.findOne('circle').attr({ fill: slicefillColor })\n                }\n\n                V(this.elLegendItems).append(elLegendSlice)\n\n            }.bind(this))\n        }, this)\n    },\n\n    // `selector` is a CSS selector or `'.'`. `attr` is either a `'fill'` or `'stroke'`.\n    // `gradient` must be in the special JointJS gradient format:\n    // `{ type: <linearGradient|radialGradient>, stops: [ { offset: <offset>, color: <color> }, ... ]`.\n    // An example is: `{ fill: { type: 'linearGradient', stops: [ { offset: '10%', color: 'green' }, { offset: '50%', color: 'blue' } ] } }`.\n    applyGradient: function(selector, attr, gradient) {\n\n        const $selected = joint.util.isString(selector) ? this.findBySelector(selector) : $(selector).toArray()\n        const gradientId = this.paper.defineGradient(gradient)\n\n        $selected.forEach(function(node) {\n            V(node).attr(attr, `url(#${  gradientId  })`)\n        })\n    },\n\n    updateSlice: function(slice) {\n\n        const elSlice = this.elSlice.clone()\n\n        // Append slice (at start for use .bbox() later)\n        V(this.elPie).append(elSlice)\n\n        // RENDER SLICE\n        const elSliceFill = this.elSliceFill.clone()\n\n        const slicefillColor = this.getSliceFillColor(slice.sliceIndex, slice.serieIndex)\n\n        elSliceFill.attr({\n            fill: slicefillColor,\n            d: V.createSlicePathData(slice.innerRadius, slice.outerRadius, slice.rad.start, slice.rad.end)\n        })\n\n        elSlice.append(elSliceFill)\n\n        // is a gradient\n        if (joint.util.isObject(slicefillColor)) {\n\n            this.applyGradient(`#${  elSliceFill.attr('id')}`, 'fill', slicefillColor)\n        }\n\n        // RENDER BORDER\n        const elSliceBorder = this.elSliceBorder.clone()\n\n        // ...with polar coordinate\n        const borderStrokeWidth = parseInt(this.model.attr('.slice > .slice-border/stroke-width'), 10)\n        const startPoint = g.point.fromPolar(slice.outerRadius + borderStrokeWidth / 2, -slice.rad.start, g.point(0, 0))\n        const endPoint = g.point.fromPolar(slice.outerRadius + borderStrokeWidth / 2, -slice.rad.end, g.point(0, 0))\n\n        elSliceBorder.attr({\n            stroke: slicefillColor,\n            d: this.drawArc(startPoint, endPoint, slice.outerRadius + borderStrokeWidth / 2, slice.rad.start, slice.rad.end)\n        })\n\n        elSlice.append(elSliceBorder)\n\n        // is a gradient\n        if (joint.util.isObject(slicefillColor)) {\n\n            this.applyGradient(`#${  elSliceBorder.attr('id')}`, 'stroke', slicefillColor)\n        }\n\n        // RENDER INNER LABEL\n        const elSliceInnerLabel = this.elSliceInnerLabel.clone()\n\n        // Apply inner label text through template\n        elSliceInnerLabel.text(joint.util.format.string(slice.innerLabel, slice))\n\n        elSlice.append(elSliceInnerLabel)\n\n        // After the append (inserted in DOM) can calculate bbox of element\n        const innerLabelBbox = elSliceInnerLabel.bbox()\n\n        // Translate label: the gap from the middle of the text (bbox) and the pie border is constant\n        const radiusLabel = (slice.outerRadius - innerLabelBbox.width / 2) - slice.innerLabelMargin\n\n        elSliceInnerLabel.translate((radiusLabel * Math.cos(-slice.middleangle)),\n            (-radiusLabel * Math.sin(-slice.middleangle)))\n\n        // Add element data attributes\n        elSlice.attr({\n            'data-serie': slice.serieIndex,\n            'data-slice': slice.sliceIndex,\n            'data-value': slice.value\n        })\n\n        // Add class for styling use\n        const nameSerie = this._series[slice.serieIndex].name\n\n        if (nameSerie) elSlice.addClass(nameSerie)\n        if (slice.name) elSlice.addClass(slice.name)\n\n        elSlice.addClass(`serie-${  slice.serieIndex  } slice-${  slice.sliceIndex}`)\n\n        // Is an outer slice\n        if (slice.isOuter) {\n            elSlice.addClass('outer')\n\n            // Apply init offset for explode some slices\n            if (slice.offset) {\n                elSlice.addClass('clicked')\n\n                this.effectOnSlice(elSlice, slice, { type: 'offset', offset: slice.offset })\n            }\n        }\n\n        return elSlice\n    },\n\n    getSliceFillColor: function(sliceIndex, serieIndex) {\n\n        serieIndex = serieIndex || 0\n\n        const attrs = this.model.get('attrs')\n\n        // Find if there is customized fill color for selected slice in attrs\n        const sliceFillAttr = Object.keys(attrs).find(function(selector) {\n            return selector.indexOf(`.serie-${  serieIndex  }.slice-${  sliceIndex  } > .slice-fill`) > -1\n        })\n\n        return sliceFillAttr ? attrs[sliceFillAttr].fill : this._series[serieIndex].data[sliceIndex].fill\n    },\n\n    onMouseMoveSlice: function(event) {\n\n        const elSlice = V(event.currentTarget)\n\n        const serieIndex = elSlice.attr('data-serie')\n        const sliceIndex = elSlice.attr('data-slice')\n\n        const slice = this._series[serieIndex].data[sliceIndex]\n\n        this.trigger(event.type, slice, event)\n    },\n\n    mouseOverSlice: function(sliceIndex, serieIndex) {\n\n        serieIndex = serieIndex || 0\n\n        const elSlice = V(this.$(`.slice[data-serie=\"${  serieIndex  }\"][data-slice=\"${  sliceIndex  }\"]`)[0])\n\n        const slice = this._series[serieIndex].data[sliceIndex]\n\n        elSlice.toggleClass('hover')\n\n        // Do effect if it is an outer slice and requested\n        if (slice.isOuter && !joint.util.isEmpty(slice.onHoverEffect)) {\n            this.effectOnSlice(elSlice, slice, slice.onHoverEffect, !elSlice.hasClass('hover'))\n        }\n\n        // Add class 'hover' also to legend\n        const elLegendSlice = V(this.$(`.legend-slice[data-serie=\"${  serieIndex  }\"][data-slice=\"${  sliceIndex  }\"]`)[0])\n        if (elLegendSlice) elLegendSlice.toggleClass('hover')\n\n        // Apply only attr style with selector '.slice' or '.legend-slice'\n        const attrsForSliceAndLegend = Object.keys(this.model.get('attrs')).filter(function(selector) {\n            return (selector.indexOf('.slice') > -1 || selector.indexOf('.legend-slice') > -1)\n        })\n\n        joint.dia.ElementView.prototype.update.call(this, this.model, joint.util.pick(this.model.get('attrs'), attrsForSliceAndLegend))\n    },\n\n    onMouseOverSlice: function(event) {\n\n        const elSlice = V(event.currentTarget)\n\n        const serieIndex = elSlice.attr('data-serie')\n        const sliceIndex = elSlice.attr('data-slice')\n\n        this.mouseOverSlice(sliceIndex, serieIndex)\n\n        const slice = this._series[serieIndex].data[sliceIndex]\n\n        this.trigger(event.type, slice, event)\n    },\n\n    clickSlice: function(sliceIndex, serieIndex) {\n\n        serieIndex = serieIndex || 0\n\n        const elSlice = V(this.$(`.slice[data-serie=\"${  serieIndex  }\"][data-slice=\"${  sliceIndex  }\"]`)[0])\n\n        const slice = this._series[serieIndex].data[sliceIndex]\n\n        if (!slice.isOuter) return\n\n        if (!elSlice.hasClass('clicked')) {\n            elSlice.addClass('clicked')\n\n            // Update the model series => resize and clone preserve offset\n            this.model.get('series')[serieIndex].data[sliceIndex].offset = slice.onClickEffect.offset\n\n            this.effectOnSlice(elSlice, slice, slice.onClickEffect)\n        } else {\n            elSlice.removeClass('clicked')\n\n            // Update the model series => resize and clone preserve offset\n            this.model.get('series')[serieIndex].data[sliceIndex].offset = 0\n\n            this.effectOnSlice(elSlice, slice, slice.onClickEffect, true)\n        }\n    },\n\n    onClickSlice: function(event) {\n\n        // Only for outer (external slice)\n        const elSlice = V($(event.target).closest('.slice.outer')[0])\n\n        if (elSlice) {\n\n            const serieIndex = elSlice.attr('data-serie')\n            const sliceIndex = elSlice.attr('data-slice')\n\n            this.clickSlice(sliceIndex, serieIndex)\n\n            const slice = this._series[serieIndex].data[sliceIndex]\n\n            this.trigger(event.type, slice, event)\n        }\n    },\n\n    onEventLegendItem: function(event) {\n\n        const elLegendItem = V($(event.target).closest('.legend-slice')[0])\n\n        if (elLegendItem) {\n\n            const serieIndex = elLegendItem.attr('data-serie')\n            const sliceIndex = elLegendItem.attr('data-slice')\n\n            switch (event.type) {\n                case 'click':\n                    this.clickSlice(sliceIndex, serieIndex)\n                    break\n                case 'mouseover':\n                case 'mouseout':\n                    this.mouseOverSlice(sliceIndex, serieIndex)\n                    break\n            }\n        }\n    },\n\n    effectOnSlice: function(elSlice, slice, effect, remove) {\n\n        remove = remove || false\n\n        switch (effect.type) {\n            case 'enlarge':\n                if (!remove) elSlice.scale(effect.scale || 1.05)\n                else elSlice.scale(1)\n                break\n            case 'offset':\n                if (!remove) elSlice.translate(effect.offset * Math.cos(-slice.middleangle), -effect.offset * Math.sin(-slice.middleangle))\n                else elSlice.translate(0, 0, { absolute: true })\n                break\n        }\n    },\n\n    svgArcMax: 2 * Math.PI - 1e-6,\n    drawArc: function(startPoint, endPoint, radius, startAngle, endAngle) {\n        let largeArcFlag = 0\n        let sweepFlag = 1\n\n        const angle = endAngle - startAngle\n\n        if (angle > Math.PI) {\n\n            largeArcFlag = 1\n\n            if (angle >= this.svgArcMax) {\n                largeArcFlag = 0\n                sweepFlag = 0\n            }\n        }\n\n        return `M${  startPoint.x  },${  startPoint.y  } A${  radius  },${\n             radius  } 0 ${  largeArcFlag  },${  sweepFlag\n             } ${  endPoint.x  },${  endPoint.y}`\n    }\n\n})\n\n// Knob chart.\n// -----------\n\n// Supports the following properties:\n// `min` and `max` for defining the domain of the `value`.\n// `value` is the final value of the knob.\n// `fill` for the fill color of the knob.\n// Moreover, all of these properties can be arrays in which case the knob\n// displayes more values stacked one on another.\njoint.shapes.chart.Knob = joint.shapes.chart.Pie.extend({\n\n    defaults: joint.util.deepSupplement({\n        type: 'chart.Knob',\n        sliceDefaults: {\n            legendLabel: '{value:.0f}',\n            outer: { offsetOnClick: 0 }\n        },\n        pieHole: .7,\n        value: 0,\n        attrs: {\n            '.legend': { 'ref-x': .5, 'ref-y': .5, 'ref-dx': null, 'x-alignment': -.5, 'y-alignment': -.5 },\n            '.legend-slice text': { 'font-size': 30 },\n            '.legend-slice circle': { display: 'none' },\n            '.slice-inner-label': { display: 'none' },\n            '.slice-fill': { stroke: 'none' }\n        }\n    }, joint.shapes.chart.Pie.prototype.defaults),\n\n    initialize: function() {\n\n        this.set('series', this.getKnobSeries(), { silent: true })\n        joint.shapes.chart.Pie.prototype.initialize.apply(this, arguments)\n        this.on('change:value change:min change:max change:fill', this.updateKnob, this)\n    },\n\n    getKnobSeries: function() {\n\n        // Create one serie with one slice holding the knob value and color.\n        const values = Array.isArray(this.get('value')) ? this.get('value') : [this.get('value')]\n        const fills = Array.isArray(this.get('fill')) ? this.get('fill') : [this.get('fill')]\n        const mins = Array.isArray(this.get('min')) ? this.get('min') : [this.get('min')]\n        const maxs = Array.isArray(this.get('max')) ? this.get('max') : [this.get('max')]\n        const series = values.map(function(value, i) {\n\n            const min = mins[i] === undefined ? mins[0] : mins[i]\n            const max = maxs[i] === undefined ? maxs[0] : maxs[i]\n            const fill = fills[i] === undefined ? fills[0] : fills[i]\n            return {\n                degree: g.scale.linear([min, max], [0, 360], value),\n                data: [ { value: value, fill: fill } ],\n                showLegend: !(i > 0) // Show legend only for the first serie.\n            }\n        })\n\n        return series\n    },\n\n    updateKnob: function() {\n\n        this.set('series', this.getKnobSeries())\n    }\n})\n\njoint.shapes.chart.KnobView = joint.shapes.chart.PieView\n\n\n// Matrix diagram.\njoint.shapes.chart.Matrix = joint.shapes.basic.Generic.extend({\n\n    markup: [\n        '<g class=\"rotatable\">',\n        '<g class=\"scalable\">',\n        '<g class=\"background\"><rect/></g>',\n        '<g class=\"cells\"/>',\n        '<g class=\"foreground\"/>',\n        '</g>',\n        '<g class=\"labels\">',\n        '<g class=\"rows\"/>',\n        '<g class=\"columns\"/>',\n        '</g>',\n        '</g>'\n    ].join(''),\n\n    cellMarkup: '<rect class=\"cell\"/>',\n    labelMarkup: '<text class=\"label\"/>',\n    gridLineMarkup: '<path class=\"grid-line\"/>',\n\n    defaults: joint.util.deepSupplement({\n\n        type: 'chart.Matrix',\n\n        attrs: {\n            '.background rect': { fill: '#eeeeee' },\n            '.grid-line': { stroke: 'white', 'stroke-width': 2 },\n            '.label': { fill: 'black', 'alignment-baseline': 'middle' },\n            '.labels .rows .label': { 'text-anchor': 'end' },\n            '.labels .columns .label': { 'text-anchor': 'start' }\n        }\n\n    }, joint.shapes.basic.Generic.prototype.defaults)\n})\n\njoint.shapes.chart.MatrixView = joint.dia.ElementView.extend({\n\n    initialize: function() {\n\n        joint.dia.ElementView.prototype.initialize.apply(this, arguments)\n        this.listenTo(this.model, 'change:size', function() { this.renderLabels(); this.update() })\n        this.listenTo(this.model, 'change:cells', function() { this.renderMarkup(); this.update() })\n    },\n\n    renderMarkup: function() {\n\n        joint.dia.ElementView.prototype.renderMarkup.apply(this, arguments)\n\n        this.elCells = this.$('.cells')[0]\n        this.elRowLabels = this.$('.labels .rows')[0]\n        this.elColumnLabels = this.$('.labels .columns')[0]\n        this.elForeground = this.$('.foreground')[0]\n\n        this.elCell = V(this.model.cellMarkup)\n        this.elGridLine = V(this.model.gridLineMarkup)\n\n        const cells = this.model.get('cells') || []\n        const size = this.model.get('size')\n\n        this.elBackgroundRect = this.$('.background rect')[0]\n        V(this.elBackgroundRect).attr(size)\n\n        const cellHeight = size.height / cells.length\n        const cellWidth = size.width / cells.length\n        const elCellsFragment = document.createDocumentFragment()\n        this.elCells.textContent = ''\n\n        this.elForeground.textContent = ''\n        const elGridLinesFragment = document.createDocumentFragment()\n\n        // Cells.\n        // ------\n\n        let row; let j; let elGridLine; let cell; let elCell\n\n        for (let i = 0; i < cells.length; i++) {\n\n            elGridLine = this.elGridLine.clone()\n            elGridLine.addClass('horizontal')\n            elGridLine.attr('d', `M 0 ${  i * cellHeight  } ${  size.width  } ${  i * cellHeight}`)\n            elGridLinesFragment.appendChild(elGridLine.node)\n\n            row = cells[i]\n            for (j = 0; j < row.length; j++) {\n\n                if (i === 0) {\n\n                    elGridLine = this.elGridLine.clone()\n                    elGridLine.addClass('vertical')\n                    elGridLine.attr('d', `M ${  j * cellWidth  } 0 ${  j * cellWidth  } ${  size.height}`)\n                    elGridLinesFragment.appendChild(elGridLine.node)\n                }\n\n                cell = row[j]\n                if (cell) {\n                    elCell = this.elCell.clone()\n                    elCell.attr(joint.util.assign({\n                        x: j * cellWidth,\n                        y: i * cellHeight,\n                        width: cellWidth,\n                        height: cellHeight\n                    }, cell))\n\n                    elCellsFragment.appendChild(elCell.node)\n                }\n            }\n        }\n\n        this.elForeground.appendChild(elGridLinesFragment)\n        this.elCells.appendChild(elCellsFragment)\n\n        this.renderLabels()\n    },\n\n    renderLabels: function() {\n\n        // Labels are outside the scalables groups. Therefore,\n        // we must make sure their position stays correct after resize.\n\n        this.elLabel = V(this.model.labelMarkup)\n\n        const cells = this.model.get('cells') || []\n        const labels = this.model.get('labels') || {}\n        const rowLabels = labels.rows || []\n        const columnLabels = labels.columns || []\n        const size = this.model.get('size')\n        const cellHeight = size.height / cells.length\n        const cellWidth = size.width / cells.length\n        let label; let elLabel\n\n        this.elRowLabels.textContent = ''\n        this.elColumnLabels.textContent = ''\n\n        const elRowLabelsFragment = document.createDocumentFragment()\n        for (let i = 0; i < rowLabels.length; i++) {\n\n            label = labels.rows[i]\n            elLabel = this.elLabel.clone()\n            elLabel.text(label.text)\n            elLabel.attr(joint.util.assign({\n                x: -(labels.padding || 5),\n                y: i * cellHeight + cellHeight / 2,\n                'text-anchor': 'end',\n                'dominant-baseline': 'central',\n                'font-size': cellHeight,\n                'data-row': i\n            }, joint.util.omit(label, 'text')))\n            elRowLabelsFragment.appendChild(elLabel.node)\n        }\n        this.elRowLabels.appendChild(elRowLabelsFragment)\n\n        let x; let y\n        const elColumnLabelsFragment = document.createDocumentFragment()\n        for (let j = 0; j < columnLabels.length; j++) {\n\n            label = labels.columns[j]\n            elLabel = this.elLabel.clone()\n            x = j * cellWidth + cellWidth / 2\n            y = -(labels.padding || 5)\n            elLabel.attr('x', x)\n            elLabel.text(label.text)\n            elLabel.attr(joint.util.assign({\n                y: y,\n                'text-anchor': 'start',\n                'dominant-baseline': 'central',\n                'font-size': cellWidth,\n                'data-column': j\n            }, joint.util.omit(label, 'text')))\n            elLabel.rotate(-90, x, y)\n            elColumnLabelsFragment.appendChild(elLabel.node)\n        }\n        this.elColumnLabels.appendChild(elColumnLabelsFragment)\n    }\n})\n\njoint.shapes.bpmn = {}\n\njoint.shapes.bpmn.icons = {\n\n    none: '',\n\n    message: 'data:image/svg+xml;base64,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',\n\n    plus: 'data:image/svg+xml;base64,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',\n\n    cross: 'data:image/svg+xml;base64,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',\n\n    user: 'data:image/svg+xml;base64,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',\n\n    circle: 'data:image/png;base64,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',\n\n    service: 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAADAAAAAwCAYAAABXAvmHAAAAGXRFWHRTb2Z0d2FyZQBBZG9iZSBJbWFnZVJlYWR5ccllPAAAB1RJREFUeNrMWltMVFcUHZAIRSAkSFACITRAVbQ/DVhHiRZC2y9jotFgqgmxKqShKdFCggZbEpP2h1Q/oLUg8GH0xy/LKwpDEEFsjKCM8kYkgAhTpggDMzCc7kX2mGF677w80J5khbnnntc+Zz/W2ReNxvsSQLhPWCBYGPhdTdjg7aBCCI/gVSfu+CHBfPz48ba7d+82AocOHfqT6mYIEV6Oua4CfE6YHxsbeyS49Pf3P6C6RYJ2vQTwVTtKHx+fXYRzhM0qTbYR/g4JCQmyVYSFhQXTHyMhUWXMzTzmTo3MorATHxH0eEXAriYrtCmNiop6tby8bLCdgNVqfR0ZGTlC735RaJ/EY+HhGSFhTVSIyg7CIO3mRHNzs44WOYydJuQQ/AjxhJ9hsFqt9qlwKElJSRB8nvAjIYYN+hucDMbCmMHBwZP03E/YLlUAKh8TnoSHh49NT0+vLG5paWk0JyfnPu9cJ8EUGho6cfTo0fbBwcFWRwH6+vpaYcy0yCk26Hb0zc7ObsFYaIOxaY5xqn9M2ClTgGw8wqM4LuzevXu6xMTEnitXrjTOz8/3Chfl7du3Ly5fvtyUkJDQrzRedXV1I2/KWZkCwCDrsMMWi+WV46Sk42+EhwV24VhnNpuHaY43NFct5pRtA7tw9BkZGQ/peVHIL+bDhw8/YrtKXJM4QOVrVNfV1TXKXr2d6mTK8EI+tk4KPrszNjY2mIJTiK+vb5iK+zX29vbqW1paLNRe7N271590PpF+hyq1hzpt3bpVTE5ODlDfFIU5FdfiTRxAkDKVlpY2QI2VVNvOHUIVXjJmUEcC6Rz7keGLffv2CdoMK5/AogzupCZA8aZNmwxkbEMKi18sKSmxqcF1QjohmgF6UYl3LPw7GxoYGBAbN24U+fn5puLi4qWqqqoBGdwJxZ+J2ZeEXF6U9dixYw+VdLi1tbWJF3/aycBn0aa9vb3J1q++vl4EBARAfYRM7oTSwpFzjjAeExMznJ6e/mRkZORfAoA20Mn8Re3KFAaD9zpH2MzP13GK1GcafSl+iIiICGEymd6Nh4BG7SbVNgNj8Zg7nQmwdPLkybahoaG22dnZbntu41i6u7sh7CzhM1fciZCKTUEf9M3KyhLJycnYBCGTO6FYmpqa3HKX5eXlDWysUW5wp0K0LSoqasvLyxP+/v7ixIkTQjZ3WhFAR8UbAdzgTmY/Pz9rfHy8KCgoEKOjo0I2d1pxzxhAr9e3GI3GZ87ogp0KpbriTrdv3+6ghS9XVlYaFxYWxFpxJ5QaltxMeAOOf+DAgQ4VI55mIy53hzuRx7GuNXfSsM5FwJURzhBK3HSjZ/8P3MmrQIYgxUJUcvDKx/OtW7c61ps7ObtSziHiqlEJ0AU+VqgfPI8lOjraajAYVNUGKgg7Kisra4RDwG9bnFAqZMTjcBBI3ziLA0ovQPL0cXFxg6STU84W1NPT8+DSpUtt8DY3btwwqqm2p9zJ1q+wsBAqC7uL9EQA3H+Fu+41NzdXkPELMmQhizvZeSc9bQ5OucAtATiKLsAPK+0KXCKIWW1trSBSJjIzM8EwxYULF4RM7mRf0tLSnrCX/JXwLW9CLPO4VVfKcHAj4kMvldwZ6ojzr5CywMBAsWXLFrFnz54VmjAxMSE84U4KQqziTvYFapqSktIJnkbtXjNvW+DU5ioB8vDIOrlq7Xfu3GmgINNHl47lixcvIiO3QszsuY273ElFgFXcSSVGTBFfew7eBv4GHucoAHz6Y+I1r23UgFRmED6e1QD8XZBOW7zlTk4EgE28rKioaHBnbNgnPJ+vw8UGrO8rcoVzdJ2MqKmp0ZEbC7l58yaSWacJn0LqoKCgcc1/XOg0nHqhBDt6XI+TsXvnNXdycQJpUCHouzOagTkxN9/mrKqZAE7QgloEOtR7zZ1cCFABRqpkxNgIMuKnmIsvQGaOJ9UepzLelzupjJnlzI2mpqZ28KKvcspHy2vY4I0AMrhTDOMLQhXeXbt2zftAJikd7yl3AmZAxXFK3lIJH08lUUo++aBSo+ki7vQBGaHTRBjdwJ7TghGENFqtNoAuPTvUEmFkDxN0Z7ZSkBymvlqltUj5DOQpd/Kk4HbG6pct5fuYp9xJQlk8depUK1/8P5EqgDvcydPV4g6gVMcutNmWd5IlgEvuhA8ixJl63LjU64uKinS4g+AW5niauE+wKn0vUwB3uNMcvM+RI0faQcKU0ioHDx60pVWMtmQWvj9jLFtaBXNwWmWXbBvYThiAO8TO8UIMHHAQaOIIPyEQ7d+/v9NRgN27d3exfv/AhG4D9zVgLIzJ7heJrW3SjdgVd7Jr8zsybfZUATyKU4tXVXKt9Txml2pqUdbXdDXuZPf+OySPkX+1CQBixtzmjEqfQL6tJaqtxU/ix3I9n4JaeUEInZmZGSHasVIxNTU1wx9TulTGNNGf35zN67eOFL6X4Hv+/Hkr3aN14PNEPYL5atgvjde4+1HBy3/PaXb49xwwzD/eZyP/EWAAQ3AUnjpOYHIAAAAASUVORK5CYII='\n}\n\n// Icon Interface\n\njoint.shapes.bpmn.IconInterface = {\n\n    initialize: function() {\n\n        // In order to be able to use multiple interfaces for one Backbone.model, we need to keep\n        // reference to the actual parent class prototype.\n        this._parent = (this._parent || this).constructor.__super__\n\n        this._parent.initialize.apply(this, arguments)\n\n        this.listenTo(this, 'change:icon', this._onIconChange)\n\n        this._onIconChange(this, this.get('icon') || 'none')\n    },\n\n    _onIconChange: function(cell, icon) {\n\n        const {icons} = joint.shapes.bpmn\n\n        if (joint.util.has(icons, icon)) {\n\n            cell.attr('image/xlink:href', icons[icon])\n\n        } else {\n\n            throw `BPMN: Unknown icon: ${  icon}`\n        }\n    }\n}\n\n// SubProcess Interface\n\njoint.shapes.bpmn.SubProcessInterface = {\n\n    initialize: function() {\n\n        // See IconInterface.initialize()\n        this._parent = (this._parent || this).constructor.__super__\n\n        this._parent.initialize.apply(this, arguments)\n\n        this.listenTo(this, 'change:subProcess', this._onSubProcessChange)\n\n        this._onSubProcessChange(this, this.get('subProcess') || null)\n    },\n\n    _onSubProcessChange: function(cell, subProcess) {\n\n        cell.attr({\n            '.sub-process': {\n                visibility: subProcess ? 'visible' : 'hidden',\n                'data-sub-process': subProcess || ''\n            }\n        })\n    }\n}\n\n\n// Task\n\njoint.shapes.bpmn.ActivityView = joint.shapes.basic.TextBlockView\njoint.shapes.bpmn.Activity = joint.shapes.basic.TextBlock.extend({\n\n    markup: [\n        '<g class=\"rotatable\">',\n        '<g class=\"scalable\"><rect class=\"body outer\"/><rect class=\"body inner\"/></g>',\n        joint.env.test('svgforeignobject') ? '<foreignObject class=\"fobj\"><body xmlns=\"http://www.w3.org/1999/xhtml\"><div class=\"content\"/></body></foreignObject>' : '<text class=\"content\"/>',\n        '<path class=\"sub-process\"/><image class=\"icon\"/></g>'\n    ].join(''),\n\n    defaults: joint.util.deepSupplement({\n\n        size: { width: 100, height: 100 },\n        type: 'bpmn.Activity',\n        attrs: {\n            rect: {\n                rx: 8,\n                ry: 8,\n                width: 100,\n                height: 100\n            },\n            '.body': {\n                fill: '#ffffff',\n                stroke: '#000000'\n            },\n            '.inner': {\n                transform: 'scale(0.9,0.9) translate(5,5)'\n            },\n            path: {\n                d: 'M 0 0 L 30 0 30 30 0 30 z M 15 4 L 15 26 M 4 15 L 26 15',\n                ref: '.inner',\n                'ref-x': 0.5,\n                'ref-dy': -30,\n                'x-alignment': 'middle',\n                stroke: '#000000',\n                fill: 'transparent'\n            },\n            image: {\n                ref: '.inner',\n                'ref-x': 5,\n                width: 20,\n                height: 20\n            }\n        },\n        activityType: 'task',\n        subProcess: null\n\n    }, joint.shapes.basic.TextBlock.prototype.defaults),\n\n    initialize: function() {\n\n        joint.shapes.basic.TextBlock.prototype.initialize.apply(this, arguments)\n\n        this.listenTo(this, 'change:activityType', this.onActivityTypeChange)\n        this.listenTo(this, 'change:subProcess', this.onSubProcessChange)\n\n        this.onSubProcessChange(this, this.get('subProcess'))\n        this.onActivityTypeChange(this, this.get('activityType'))\n    },\n\n    onActivityTypeChange: function(cell, type) {\n\n        switch (type) {\n\n            case 'task':\n\n                cell.attr({\n                    '.inner': {\n                        visibility: 'hidden'\n                    },\n                    '.outer': {\n                        'stroke-width': 1,\n                        'stroke-dasharray': 'none'\n                    },\n                    path: {\n                        ref: '.outer'\n                    },\n                    image: {\n                        ref: '.outer'\n                    }\n                })\n\n                break\n\n            case 'transaction':\n\n                cell.attr({\n                    '.inner': {\n                        visibility: 'visible'\n                    },\n                    '.outer': {\n                        'stroke-width': 1,\n                        'stroke-dasharray': 'none'\n                    },\n                    path: {\n                        ref: '.inner'\n                    },\n                    image: {\n                        ref: '.inner'\n                    }\n                })\n\n                break\n\n            case 'event-sub-process':\n\n                cell.attr({\n                    '.inner': {\n                        visibility: 'hidden'\n                    },\n                    '.outer': {\n                        'stroke-width': 1,\n                        'stroke-dasharray': '1,2'\n                    },\n                    path: {\n                        ref: '.outer'\n                    },\n                    image: {\n                        ref: '.outer'\n                    }\n                })\n\n                break\n\n            case 'call-activity':\n\n                cell.attr({\n                    '.inner': {\n                        visibility: 'hidden'\n                    },\n                    '.outer': {\n                        'stroke-width': 5,\n                        'stroke-dasharray': 'none'\n                    },\n                    path: {\n                        ref: '.outer'\n                    },\n                    image: {\n                        ref: '.outer'\n                    }\n                })\n\n                break\n\n            default:\n\n                throw `BPMN: Unknown Activity Type: ${  type}`\n        }\n    },\n\n    onSubProcessChange: function(cell, subProcess) {\n\n        // Although that displaying sub-process icon is implemented in the interface\n        // we want also to reposition text and image when sub-process is shown.\n\n        if (subProcess) {\n\n            cell.attr({\n                '.fobj div': {\n                    style: {\n                        verticalAlign: 'baseline',\n                        paddingTop: 10\n                    }\n                },\n                image: {\n                    'ref-dy': -25,\n                    'ref-y': ''\n                },\n                text: { // IE fallback only\n                    'ref-y': 25\n                }\n            })\n\n        } else {\n\n            cell.attr({\n                '.fobj div': {\n                    style: {\n                        verticalAlign: 'middle',\n                        paddingTop: 0\n                    }\n                },\n                image: {\n                    'ref-dy': '',\n                    'ref-y': 5\n                },\n                text: { // IE fallback only\n                    'ref-y': .5\n                }\n            })\n        }\n    }\n\n}).extend(joint.shapes.bpmn.IconInterface).extend(joint.shapes.bpmn.SubProcessInterface)\n\n// Annotation\n\njoint.shapes.bpmn.AnnotationView = joint.shapes.basic.TextBlockView\njoint.shapes.bpmn.Annotation = joint.shapes.basic.TextBlock.extend({\n\n    markup: [\n        '<g class=\"rotatable\">',\n        '<g class=\"scalable\"><rect class=\"body\"/></g>',\n        joint.env.test('svgforeignobject') ? '<foreignObject class=\"fobj\"><body xmlns=\"http://www.w3.org/1999/xhtml\"><div class=\"content\"/></body></foreignObject>' : '<text class=\"content\"/>',\n        '<path class=\"stroke\"/></g>'\n    ].join(''),\n\n    defaults: joint.util.deepSupplement({\n\n        size: { width: 100, height: 100 },\n        type: 'bpmn.Annotation',\n        attrs: {\n            rect: {\n                width: 100,\n                height: 100\n            },\n            '.body': {\n                'fill-opacity': 0.1,\n                fill: '#ffffff',\n                stroke: 'none'\n            },\n            '.fobj div': {\n                style: {\n                    textAlign: 'left',\n                    paddingLeft: 10\n                }\n            },\n            '.stroke': {\n                stroke: '#000000',\n                fill: 'none',\n                'stroke-width': 3\n            }\n\n        },\n        wingLength: 20\n\n    }, joint.shapes.basic.TextBlock.prototype.defaults),\n\n    initialize: function() {\n\n        joint.shapes.basic.TextBlock.prototype.initialize.apply(this, arguments)\n\n        this.listenTo(this, 'change:size', this.onSizeChange)\n\n        // calculate dasharray for first time\n        this.onSizeChange(this, this.get('size'))\n    },\n\n    onSizeChange: function(cell, size) {\n\n        cell.attr('.stroke', {\n            d: cell.getStrokePathData(size.width, size.height, cell.get('wingLength'))\n        })\n    },\n\n    getStrokePathData: function(width, height, wingLength) {\n\n        // wing length can't be greater than the element width\n        wingLength = Math.min(wingLength, width)\n\n        return ['M', wingLength, '0 L 0 0 0', height, wingLength, height].join(' ')\n    }\n\n})\n\n// Gateway\n\njoint.shapes.bpmn.Gateway = joint.dia.Element.extend({\n\n    markup: '<g class=\"rotatable\"><g class=\"scalable\"><polygon class=\"body\"/><image/></g></g><text class=\"label\"/>',\n\n    defaults: joint.util.deepSupplement({\n\n        type: 'bpmn.Gateway',\n        size: { width: 80, height: 80 },\n        attrs: {\n            '.body': {\n                points: '40,0 80,40 40,80 0,40',\n                fill: '#ffffff',\n                stroke: '#000000'\n            },\n            '.label': {\n                text: '',\n                ref: '.body',\n                'ref-x': .5,\n                'ref-dy': 20,\n                'y-alignment': 'middle',\n                'x-alignment': 'middle',\n                'font-size': 14,\n                'font-family': 'Arial, helvetica, sans-serif',\n                fill: '#000000'\n            },\n            image: {\n                width:  40, height: 40, 'xlink:href': '', transform: 'translate(20,20)'\n            }\n        }\n\n    }, joint.dia.Element.prototype.defaults)\n\n}).extend(joint.shapes.bpmn.IconInterface)\n\n// Events\n\njoint.shapes.bpmn.Event = joint.dia.Element.extend({\n\n    markup: '<g class=\"rotatable\"><g class=\"scalable\"><circle class=\"body outer\"/><circle class=\"body inner\"/><image/></g><text class=\"label\"/></g>',\n\n    defaults: joint.util.deepSupplement({\n\n        type: 'bpmn.Event',\n        size: { width: 60, height: 60 },\n        attrs: {\n            '.body': {\n                fill: '#ffffff',\n                stroke: '#000000'\n            },\n            '.outer': {\n                'stroke-width': 1, r: 30,\n                transform: 'translate(30,30)'\n            },\n            '.inner': {\n                'stroke-width': 1, r: 26,\n                transform: 'translate(30,30)'\n            },\n            image: {\n                width:  40, height: 40, 'xlink:href': '', transform: 'translate(10,10)'\n            },\n            '.label': {\n                text: '',\n                fill: '#000000',\n                'font-family': 'Arial', 'font-size': 14,\n                ref: '.outer', 'ref-x': .5, 'ref-dy': 20,\n                'x-alignment': 'middle', 'y-alignment': 'middle'\n            }\n        },\n        eventType: 'start'\n\n    }, joint.dia.Element.prototype.defaults),\n\n    initialize: function() {\n\n        joint.dia.Element.prototype.initialize.apply(this, arguments)\n\n        this.listenTo(this, 'change:eventType', this.onEventTypeChange)\n\n        this.onEventTypeChange(this, this.get('eventType'))\n    },\n\n    onEventTypeChange: function(cell, type) {\n\n        switch (type) {\n\n            case 'start':\n\n                cell.attr({\n                    '.inner': {\n                        visibility: 'hidden'\n                    },\n                    '.outer': {\n                        'stroke-width': 1\n                    }\n                })\n\n                break\n\n            case 'end':\n\n                cell.attr({\n                    '.inner': {\n                        visibility: 'hidden'\n                    },\n                    '.outer': {\n                        'stroke-width': 5\n                    }\n                })\n\n                break\n\n            case 'intermediate':\n\n                cell.attr({\n                    '.inner': {\n                        visibility: 'visible'\n                    },\n                    '.outer': {\n                        'stroke-width': 1\n                    }\n                })\n\n                break\n\n            default:\n\n                throw `BPMN: Unknown Event Type: ${  type}`\n        }\n    }\n\n}).extend(joint.shapes.bpmn.IconInterface)\n\n// Pool & Lanes\n\njoint.shapes.bpmn.Pool = joint.dia.Element.extend({\n\n    markup: ['<g class=\"rotatable\">',\n        '<g class=\"scalable\"><rect class=\"body\"/></g>',\n        '<svg overflow=\"hidden\" class=\"blackbox-wrap\"><text class=\"blackbox-label\"/></svg>',\n        '<rect class=\"header\"/><text class=\"label\"/>',\n        '<g class=\"lanes\"/>',\n        '</g>'].join(''),\n\n    laneMarkup: '<g class=\"lane\"><rect class=\"lane-body\"/><rect class=\"lane-header\"/><text class=\"lane-label\"/></g>',\n\n    defaults: joint.util.deepSupplement({\n\n        type: 'bpmn.Pool',\n        size: {\n            width: 600,\n            height: 300\n        },\n        attrs: {\n            '.body': {\n                fill: '#ffffff',\n                stroke: '#000000',\n                width: 500,\n                height: 200,\n                'pointer-events': 'stroke'\n            },\n            '.header': {\n                fill: '#ffffff',\n                stroke: '#000000',\n                width: 20,\n                ref: '.body',\n                'ref-height': 1,\n                'pointer-events': 'visiblePainted'\n            },\n            '.label': {\n                fill: '#000000',\n                transform: 'rotate(-90)',\n                ref: '.header',\n                'ref-x': 10,\n                'ref-y': .5,\n                'font-family': 'Arial',\n                'font-size': 14,\n                'x-alignment': 'middle',\n                'text-anchor': 'middle'\n            },\n            '.lane-body': {\n                fill: '#ffffff',\n                stroke: '#000000',\n                'pointer-events': 'stroke'\n            },\n            '.lane-header': {\n                fill: '#ffffff',\n                stroke: '#000000',\n                'pointer-events': 'visiblePainted'\n            },\n            '.lane-label': {\n                fill: '#000000',\n                transform: 'rotate(-90)',\n                'text-anchor': 'middle',\n                'font-family': 'Arial',\n                'font-size': 13\n            },\n            '.blackbox-wrap': {\n                ref: '.body',\n                'ref-width': 1,\n                'ref-height': 1\n            },\n            '.blackbox-label': {\n                text: 'Black Box',\n                'text-anchor': 'middle',\n                transform: 'translate(0,-7)'\n            },\n            '.blackbox-label > tspan': {\n                dx: '50%',\n                dy: '50%'\n            }\n        }\n\n    }, joint.dia.Element.prototype.defaults)\n})\n\njoint.shapes.bpmn.PoolView = joint.dia.ElementView.extend({\n\n    options: {\n        headerWidth: 20\n    },\n\n    initialize: function() {\n\n        this.listenTo(this.model, 'change:lanes', function(cell, lanes) {\n\n            this.renderLanes(lanes)\n        })\n\n        joint.dia.ElementView.prototype.initialize.apply(this, arguments)\n    },\n\n    update: function() {\n\n        if (this.lanesAttrs === undefined) {\n            // This is the first time update. We render the lanes.\n            return this.renderLanes(this.model.get('lanes'))\n        }\n\n        return joint.dia.ElementView.prototype.update.call(this, this.model,\n            // always update everything including the lanes attributes\n            joint.util.merge({}, this.model.get('attrs'), this.lanesAttrs || {})\n        )\n    },\n\n    renderMarkup: function() {\n\n        joint.dia.ElementView.prototype.renderMarkup.apply(this, arguments)\n\n        // a holder for all the lanes\n        this.$lanes = this.$('.lanes')\n\n        // An SVG element for the lane\n        this.laneMarkup =  V(this.model.laneMarkup)\n    },\n\n    renderLanes: function(lanes) {\n\n        lanes = lanes || {}\n\n        // index keeps track on how many lanes we created\n        this.index = 0\n\n        const headerWidth = lanes.headerWidth === undefined ? this.options.headerWidth : lanes.headerWidth\n        this.lanesAttrs = {\n            '.header': { width: headerWidth },\n            '.label': { text: lanes.label || '' }\n        }\n\n        this.$lanes.empty()\n\n        if (lanes.sublanes) {\n\n            // recursion start\n            this.renderSublanes(lanes.sublanes, headerWidth, 0, 1, 'lanes')\n        }\n\n        // We don't want the lanes attributes to be stored on model.\n        // That's why we are using renderingOnlyAttrs parameter in ElementView.update\n        this.update(this.model, joint.util.merge({}, this.model.get('attrs'), this.lanesAttrs))\n    },\n\n    calculateRatios: function(lanes, ratio) {\n\n        let definedRatio = 0\n        const calculated = []\n        const ratios = []\n\n        for (let i = 0, n = lanes.length; i < n; i++) {\n            const lane = lanes[i]\n            const laneRatio = lane.ratio\n            if (Number.isFinite(laneRatio)) {\n                definedRatio += laneRatio / 10\n                ratios[i] = laneRatio / 10 / ratio\n            } else {\n                calculated.push(i)\n            }\n        }\n\n        const calculatedRatio = Math.max(1 - definedRatio, 0) * ratio / calculated.length\n        for (let j = 0, m = calculated.length; j < m; j++) {\n            ratios[calculated[j]] = calculatedRatio\n        }\n\n        return ratios\n    },\n\n    renderSublanes: function(lanes, prevX, prevY, prevRatio, prevPath) {\n\n        const defaultHeaderWidth = this.options.headerWidth\n        const path = `${prevPath  }/sublanes/`\n        const ratios = this.calculateRatios(lanes, prevRatio)\n\n        joint.util.toArray(lanes).reduce(function(ratioSum, lane, index) {\n\n            let className = `lane${  this.index}`\n            const bodySelector = `.${  className  } .lane-body`\n            const headerSelector = `.${  className  } .lane-header`\n            const labelSelector = `.${  className  } .lane-label`\n\n            if (lane.name) {\n                // add custom css class if specified\n                className += ` ${  lane.name}`\n            }\n\n            // append a new lane to the pool\n            const lanePath = path + index\n            const svgLane = this.laneMarkup.clone()\n                .addClass(className)\n                .attr({\n                    'data-lane-path': lanePath,\n                    'data-lane-index': this.index\n                })\n\n            this.$lanes.append(svgLane.node)\n\n            const ratio = ratios[index]\n            const headerWidth = lane.headerWidth === undefined ? defaultHeaderWidth : lane.headerWidth\n            const y = prevY + ratioSum\n\n            this.lanesAttrs[bodySelector] = {\n                ref: '.body',\n                'ref-height': ratio,\n                'ref-width': -prevX,\n                'ref-x': prevX,\n                'ref-y': y\n            }\n\n            this.lanesAttrs[headerSelector] = {\n                width: headerWidth,\n                ref: '.body',\n                'ref-height': ratio,\n                'ref-x': prevX,\n                'ref-y': y\n            }\n\n            this.lanesAttrs[labelSelector] = {\n                text: lane.label,\n                ref: headerSelector,\n                'ref-x': 10,\n                'ref-y': .5,\n                'x-alignment': 'middle'\n            }\n\n            this.index++\n\n            if (lane.sublanes) {\n\n                // recursively render any child lanes\n                this.renderSublanes(lane.sublanes, prevX + headerWidth, y, ratio, lanePath)\n            }\n\n            return ratioSum + ratio\n\n        }.bind(this), 0)\n    }\n})\n\n// Group\n\njoint.shapes.bpmn.Group = joint.dia.Element.extend({\n\n    markup: '<g class=\"rotatable\"><g class=\"scalable\"><rect class=\"body\"/></g><rect class=\"label-rect\"/><g class=\"label-group\"><svg overflow=\"hidden\" class=\"label-wrap\"><text class=\"label\"/></svg></g></g>',\n\n    defaults: joint.util.deepSupplement({\n\n        type: 'bpmn.Group',\n        size: {\n            width: 200,\n            height: 200\n        },\n        attrs: {\n            '.body': {\n                width: 200,\n                height: 200,\n                stroke: '#000000',\n                'stroke-dasharray': '6,6',\n                'stroke-width': 2,\n                fill: 'transparent',\n                rx: 15,\n                ry: 15,\n                'pointer-events': 'stroke'\n            },\n            '.label-rect': {\n                ref: '.body',\n                'ref-width': 0.6,\n                'ref-x': 0.4,\n                'ref-y': -30,\n                height: 25,\n                fill: '#ffffff',\n                stroke: '#000000'\n            },\n            '.label-group': {\n                ref: '.label-rect',\n                'ref-x': 0,\n                'ref-y': 0\n            },\n            '.label-wrap': {\n                ref: '.label-rect',\n                'ref-width': 1,\n                'ref-height': 1\n            },\n            '.label': {\n                text: '',\n                x: '50%',\n                y: '1.3em',\n                'text-anchor': 'middle',\n                'font-family': 'Arial',\n                'font-size': 14,\n                fill: '#000000'\n            }\n        }\n\n    }, joint.dia.Element.prototype.defaults)\n})\n\n// Data Object\n\njoint.shapes.bpmn.DataObject = joint.dia.Element.extend({\n\n    markup: '<g class=\"rotatable\"><g class=\"scalable\"><polygon class=\"body\"/></g><text class=\"label\"/></g>',\n\n    defaults: joint.util.deepSupplement({\n\n        type: 'bpmn.DataObject',\n        size: {\n            width: 60,\n            height: 80\n        },\n        attrs: {\n            '.body': {\n                points: '20,0 60,0 60,80 0,80 0,20 20,0 20,20 0,20',\n                stroke: '#000000',\n                fill: '#ffffff'\n            },\n            '.label': {\n                ref: '.body',\n                'ref-x': .5,\n                'ref-dy': 5,\n                text: '',\n                'text-anchor': 'middle'\n            }\n        }\n\n    }, joint.dia.Element.prototype.defaults)\n})\n\njoint.shapes.bpmn.Conversation = joint.dia.Element.extend({\n\n    markup: '<g class=\"rotatable\"><g class=\"scalable\"><polygon class=\"body\"/></g><text class=\"label\"/><path class=\"sub-process\"/></g>',\n\n    defaults: joint.util.deepSupplement({\n\n        type: 'bpmn.Conversation',\n        size: {\n            width: 100,\n            height: 100\n        },\n        attrs: {\n            '.body': {\n                points: '25,0 75,0 100,50 75,100 25,100 0,50',\n                stroke: '#000000',\n                fill: '#ffffff'\n            },\n            '.label': {\n                text: '',\n                ref: '.body',\n                'ref-x': .5,\n                'ref-dy': 5,\n                'text-anchor': 'middle'\n            },\n            path: {\n                d: 'M 0 0 L 30 0 30 30 0 30 z M 15 4 L 15 26 M 4 15 L 26 15',\n                ref: '.body',\n                'ref-x': 0.5,\n                'ref-dy': -30,\n                'x-alignment': 'middle',\n                fill: '#ffffff',\n                stroke: '#000000',\n                'fill-opacity': 0\n            }\n        },\n\n        conversationType: 'conversation'\n\n    }, joint.dia.Element.prototype.defaults),\n\n    initialize: function() {\n\n        joint.dia.Element.prototype.initialize.apply(this, arguments)\n\n        this.listenTo(this, 'change:conversationType', this.onConversationTypeChange)\n\n        this.onConversationTypeChange(this, this.get('conversationType'))\n    },\n\n    onConversationTypeChange: function(cell, type) {\n\n        switch (type) {\n\n            case 'conversation':\n\n                cell.attr('polygon/stroke-width', 1)\n\n                break\n\n            case 'call-conversation':\n\n                cell.attr('polygon/stroke-width', 4)\n\n                break\n\n            default:\n\n                throw `BPMN: Unknown Conversation Type: ${  type}`\n        }\n    }\n\n}).extend(joint.shapes.bpmn.SubProcessInterface)\n\n// Choreograpy\n\njoint.shapes.bpmn.Choreography = joint.shapes.basic.TextBlock.extend({\n    /*\n        markup: '<g class=\"rotatable\"><g class=\"scalable\"><rect class=\"body\"/></g><g class=\"participants\"/><text class=\"label\"/><path class=\"sub-process\"/></g>',\n*/\n    markup: [\n        '<g class=\"rotatable\">',\n        '<g class=\"scalable\"><rect class=\"body\"/></g>',\n        joint.env.test('svgforeignobject') ? '<foreignObject class=\"fobj\"><body xmlns=\"http://www.w3.org/1999/xhtml\"><div class=\"content\"/></body></foreignObject>' : '<text class=\"content\"/>',\n        '<text class=\"label\"/><path class=\"sub-process\"/><g class=\"participants\"/>',\n        '</g>'\n    ].join(''),\n\n    participantMarkup: '<g class=\"participant\"><rect class=\"participant-rect\"/><text class=\"participant-label\"/></g>',\n\n    defaults: joint.util.deepSupplement({\n\n        type: 'bpmn.Choreography',\n        size: {\n            width: 60,\n            height: 80\n        },\n        attrs: {\n            // HACK (TODO!): as we don't have indexes on attributes yet (to determine the order\n            // of applying attributes) we have to reintroduce the rect attribute again\n            // so it changes the \"order\" how the attributes are processed.\n            // It's necessary to apply all `rect` attributes before we apply '.body' attributes,\n            // otherwise our stroke and fill will be overwritten.\n            rect: {},\n            '.body': {\n                width: 60,\n                height: 80,\n                stroke: '#000000',\n                fill: '#ffffff'\n            },\n            '.label': {\n                ref: '.body',\n                'ref-x': .5,\n                'ref-dy': 5,\n                text: '',\n                'text-anchor': 'middle'\n            },\n            '.participant-rect': {\n                stroke: '#000000',\n                fill: '#aaaaaa',\n                ref: '.body',\n                'ref-width': 1\n            },\n            '.participant-label': {\n                'text-anchor': 'middle',\n                ref: '.participant_0 .participant-rect',\n                'ref-x': .5,\n                'ref-y': .5,\n                'y-alignment': 'middle'\n            },\n            '.sub-process': {\n                d: 'M 0 0 L 30 0 30 30 0 30 z M 15 4 L 15 26 M 4 15 L 26 15',\n                ref: '.body',\n                'ref-x': 0.5,\n                'ref-dy': -30,\n                'x-alignment': 'middle',\n                fill: 'transparent',\n                stroke: '#000000'\n            }\n        },\n\n        participants: [],\n        initiatingParticipant: 0 // index (number) or participant name (string)\n\n    }, joint.shapes.basic.TextBlock.prototype.defaults)\n\n}).extend(joint.shapes.bpmn.SubProcessInterface)\n\njoint.shapes.bpmn.ChoreographyView = joint.shapes.basic.TextBlockView.extend({\n\n    options: {\n        participantHeight: 20\n    },\n\n    initialize: function() {\n\n        this.listenTo(this.model, 'change:participants', function(cell, participants) {\n            this.renderParticipants(participants)\n        })\n\n        this.listenTo(this.model, 'change:initiatingParticipant', this.layoutAndUpdate)\n\n        joint.shapes.basic.TextBlockView.prototype.initialize.apply(this, arguments)\n\n        if (!joint.env.test('svgforeignobject')) {\n            // Attach our own handler for content change.\n            // The new one will take the participant attributes into account.\n            this.stopListening(this.model, 'change:content').listenTo(this.model, 'change:content', function(cell) {\n                this.updateContent(cell, this.participantsAttrs)\n            })\n        }\n    },\n\n    update: function() {\n\n        if (this.participantsAttrs === undefined) {\n            // This is the first time update. We render the participants.\n            return this.renderParticipants(this.model.get('participants'))\n        }\n\n        this.layoutAndUpdate()\n\n        return this\n    },\n\n    render: function() {\n        // Reset participants cache when `dirty: true` flag used in `attrs()`.\n        this.participantsAttrs = undefined\n        joint.dia.ElementView.prototype.render.apply(this, arguments)\n    },\n\n    renderMarkup: function() {\n\n        joint.dia.ElementView.prototype.renderMarkup.apply(this, arguments)\n\n        // a holder for all the lanes\n        this.$participants = this.$('.participants')\n\n        // An SVG element for the lane\n        this.participantMarkup =  V(this.model.participantMarkup)\n    },\n\n    renderParticipants: function(participants) {\n\n        this.$participants.empty()\n        this.participantsAttrs = {}\n\n        joint.util.toArray(participants).forEach(function(participant, index) {\n\n            const className = `participant_${  index}`\n            const selector = `.${  className}`\n\n            this.participantsAttrs[`${selector  } .participant-rect`] = {\n                height: this.options.participantHeight\n            }\n\n            this.participantsAttrs[`${selector  } .participant-label`] = {\n                text: participant\n            }\n\n            this.$participants.append(this.participantMarkup.clone().addClass(className).node)\n\n        }, this)\n\n        this.layoutAndUpdate()\n    },\n\n    layoutAndUpdate: function() {\n\n        const participants = this.model.get('participants') || []\n\n        const count = participants.length\n\n        const pHeight = this.options.participantHeight\n        const eHeight = this.model.get('size').height\n        const bHeight = Math.max(0, eHeight - (pHeight * count))\n\n        let offsetY = 0\n\n        const initiator = this.model.get('initiatingParticipant')\n\n        // initiator index\n        const i = Math.max(joint.util.isNumber(initiator) ? Math.abs(initiator) : participants.indexOf(initiator), 0)\n\n        // body position index\n        const b = Math.min(i, count - 2)\n\n        joint.util.toArray(participants).forEach(function(participant, index) {\n\n            const selector = `.participant_${  index}`\n\n            this.participantsAttrs[selector] = {\n                transform: `translate(0,${  offsetY  })`\n            }\n\n            this.participantsAttrs[`${selector  } .participant-rect`].fill = (i == index)\n                ? this.model.attr('.body/fill')\n                : this.model.attr('.participant-rect/fill')\n\n            this.participantsAttrs[`${selector  } .participant-rect`].stroke = (i == index)\n                ? this.model.attr('.body/stroke')\n                : this.model.attr('.participant-rect/stroke')\n\n            offsetY += pHeight + (b == index ? bHeight : 0)\n\n        }, this)\n\n        // set sub-process icon position\n        const sp = count < 2 ? 0 : b - count + 1\n\n        this.participantsAttrs['.sub-process'] = {\n            'ref-dy': Math.max(-eHeight, sp * pHeight - 30)\n        }\n\n        // Change text content position in the middle of the participant body\n        const c = count < 2 ? 0 : b + 1\n\n        this.participantsAttrs['.fobj div'] = {\n            style: {\n                height: bHeight,\n                paddingTop: pHeight * c\n            }\n        }\n        // Same as above just IE fallback\n        this.participantsAttrs['.content'] = {\n            'ref-y': pHeight * c + bHeight / 2\n        }\n\n        // We don't want the participants attributes to be stored on model.\n        // That's why we are using renderingOnlyAttrs parameter in ElementView.update\n        const attrs = joint.util.merge({}, this.model.get('attrs'), this.participantsAttrs || {})\n\n        // Backwards compatibility\n        // The text is set by `.content/html` now (leaving this in the attrs would result\n        // in not being able to change content).\n        joint.util.unsetByPath(attrs, 'div/html')\n\n        joint.shapes.basic.TextBlockView.prototype.update.call(this, this.model, attrs)\n    }\n\n})\n\n// Message\n\njoint.shapes.bpmn.Message = joint.dia.Element.extend({\n\n    markup: '<g class=\"rotatable\"><g class=\"scalable\"><polygon class=\"body\"/></g><text class=\"label\"/></g>',\n\n    defaults: joint.util.deepSupplement({\n\n        type: 'bpmn.Message',\n        size: {\n            width: 60,\n            height: 40\n        },\n        attrs: {\n            '.body': {\n                points: '0,0 60,0 60,40 0,40 0,0 60,0 30,20 0,0',\n                stroke: '#000000',\n                fill: '#ffffff'\n            },\n            '.label': {\n                ref: '.body',\n                'ref-x': .5,\n                'ref-dy': 5,\n                text: '',\n                'text-anchor': 'middle'\n            }\n        }\n\n    }, joint.dia.Element.prototype.defaults)\n})\n\n// Sequence Flows\n\njoint.shapes.bpmn.Flow = joint.dia.Link.extend({\n\n    defaults: {\n\n        type: 'bpmn.Flow',\n\n        attrs: {\n\n            '.marker-source': {\n                d: 'M 0 0'\n            },\n            '.marker-target': {\n                d: 'M 10 0 L 0 5 L 10 10 z',\n                fill: '#000000'\n            },\n            '.connection': {\n                'stroke-dasharray': ' ',\n                'stroke-width': 1\n            },\n            '.connection-wrap': {\n                style: '',\n                onMouseOver: '',\n                onMouseOut: ''\n            }\n        },\n\n        flowType: 'normal'\n    },\n\n    initialize: function() {\n\n        joint.dia.Link.prototype.initialize.apply(this, arguments)\n\n        this.listenTo(this, 'change:flowType', this.onFlowTypeChange)\n\n        this.onFlowTypeChange(this, this.get('flowType'))\n    },\n\n    onFlowTypeChange: function(cell, type) {\n\n        let attrs\n\n        switch (type) {\n\n            case 'default':\n\n                attrs = {\n                    '.marker-source': {\n                        d: 'M 0 5 L 20 5 M 20 0 L 10 10',\n                        fill: 'none'\n                    }\n                }\n\n                break\n\n            case 'conditional':\n\n                attrs = {\n                    '.marker-source': {\n                        d: 'M 20 8 L 10 0 L 0 8 L 10 16 z',\n                        fill: '#FFF'\n                    }\n                }\n\n                break\n\n            case 'normal':\n\n                attrs = {}\n\n                break\n\n            case 'message':\n\n                attrs = {\n                    '.marker-target': {\n                        fill: '#FFF'\n                    },\n                    '.connection': {\n                        'stroke-dasharray': '4,4'\n                    }\n                }\n\n                break\n\n            case 'association':\n\n                attrs = {\n                    '.marker-target': {\n                        d: 'M 0 0'\n                    },\n                    '.connection': {\n                        'stroke-dasharray': '4,4'\n                    }\n                }\n\n                break\n\n            case 'conversation':\n\n                // The only way how to achieved 'spaghetti insulation effect' on links is to\n                // have the .connection-wrap covering the inner part of the .connection.\n                // The outer part of the .connection then looks like two parallel lines.\n                attrs = {\n                    '.marker-target': {\n                        d: 'M 0 0'\n                    },\n                    '.connection': {\n                        'stroke-width': '7px'\n                    },\n                    '.connection-wrap': {\n                        // As the css takes priority over the svg attributes, that's only way\n                        // how to overwrite default jointjs styling.\n                        style: 'stroke: #fff; stroke-width: 5px; opacity: 1;',\n                        onMouseOver: 'var s=this.style;s.stroke=\\'#000\\';s.strokeWidth=15;s.opacity=.4',\n                        onMouseOut: 'var s=this.style;s.stroke=\\'#fff\\';s.strokeWidth=5;s.opacity=1'\n                    }\n                }\n\n                break\n\n            default:\n\n                throw `BPMN: Unknown Flow Type: ${  type}`\n        }\n\n        cell.attr(joint.util.merge({}, this.defaults.attrs, attrs))\n    }\n})\n\n// Command manager implements undo/redo functionality.\n\njoint.dia.CommandManager = Backbone.Model.extend({\n\n    defaults: {\n        cmdBeforeAdd: null,\n        cmdNameRegex: /^(?:add|remove|change:\\w+)$/,\n        // List of options names that will passed when a command is applied (redone).\n        // e.g ['propertyPath', 'propertyValue']\n        // See `dia.Cell.prototype.prop()` for more about the `propertyPath` option.\n        applyOptionsList: ['propertyPath'],\n        // List of options names that will passed when a command is reverted (undone).\n        revertOptionsList: ['propertyPath']\n    },\n\n    // length of prefix 'change:' in the event name\n    PREFIX_LENGTH: 7,\n\n    initialize: function(options) {\n\n        joint.util.bindAll(this, 'initBatchCommand', 'storeBatchCommand')\n\n        this.graph = options.graph\n\n        this.reset()\n        this.listen()\n    },\n\n    listen: function() {\n\n        this.listenTo(this.graph, 'all', this.addCommand, this)\n\n        this.listenTo(this.graph, 'batch:start', this.initBatchCommand, this)\n        this.listenTo(this.graph, 'batch:stop', this.storeBatchCommand, this)\n    },\n\n    createCommand: function(options) {\n\n        const cmd = {\n            action: undefined,\n            data: { id: undefined, type: undefined, previous: {}, next: {}},\n            batch: options && options.batch\n        }\n\n        return cmd\n    },\n\n    push: function(cmd) {\n\n        this.redoStack = []\n\n        if (!cmd.batch) {\n            this.undoStack.push(cmd)\n            this.trigger('add', cmd)\n        } else {\n            this.lastCmdIndex = Math.max(this.lastCmdIndex, 0)\n            // Commands possible thrown away. Someone might be interested.\n            this.trigger('batch', cmd)\n        }\n    },\n\n    addCommand: function(cmdName, cell, graph, options) {\n\n        // Do not account for changes in `dry` run.\n        if (options && options.dry) {\n            return\n        }\n\n        if (!this.get('cmdNameRegex').test(cmdName)) {\n            return\n        }\n\n        if (typeof this.get('cmdBeforeAdd') === 'function' && !this.get('cmdBeforeAdd').apply(this, arguments)) {\n            return\n        }\n\n        let command\n        const isGraphCommand = (cell instanceof joint.dia.Graph)\n\n        if (this.batchCommand) {\n            // set command as the one used last.\n            // in most cases we are working with same object, doing same action\n            // etc. translate an object piece by piece\n            command = this.batchCommand[Math.max(this.lastCmdIndex, 0)]\n\n            // Check if we are start working with new object or performing different action with it.\n            // Note, that command is uninitialized when lastCmdIndex equals -1. (see 'initBatchCommand()')\n            // in that case we are done, command we were looking for is already set\n            const isDifferentModel = ((isGraphCommand && !command.graphChange) || command.data.id !== cell.id)\n            const isDifferentAction = (command.action !== cmdName)\n            if (this.lastCmdIndex >= 0 && (isDifferentModel || isDifferentAction)) {\n\n                // trying to find command first, which was performing same action with the object\n                // as we are doing with the model now\n                const similarCommandIndex = this.batchCommand.findIndex(function(cmd, index) {\n                    return ((isGraphCommand && cmd.graphChange) || cmd.data.id === cell.id) && cmd.action === cmdName\n                })\n\n                if (similarCommandIndex < 0 || (cmdName === 'add' || cmdName === 'remove')) {\n                    // command with such an id and action was not found. Let's create new one.\n                    // Adding and Removing is always preserve as new command. e.g.\n                    // (add1, remove1, add2) can not be changed to (remove1, add2) neither (add2, remove1).\n                    command = this.createCommand({ batch:  true })\n                } else {\n                    // move the command to the end of the batch.\n                    command = this.batchCommand[similarCommandIndex]\n                    this.batchCommand.splice(similarCommandIndex, 1)\n                }\n\n                this.lastCmdIndex = this.batchCommand.push(command) - 1\n            }\n\n        } else {\n\n            // single command\n            command = this.createCommand({ batch: false })\n        }\n\n        if (cmdName === 'add' || cmdName === 'remove') {\n\n            command.action = cmdName\n            command.data.id = cell.id\n            command.data.type = cell.attributes.type\n            command.data.attributes = joint.util.merge({}, cell.toJSON())\n            command.options = options || {}\n\n            this.push(command)\n            return\n        }\n\n        // `changedAttribute` holds the attribute name corresponding\n        // to the change event triggered on the model.\n        const changedAttribute = cmdName.substr(this.PREFIX_LENGTH)\n\n        if (!command.batch || !command.action) {\n            // Do this only once. Set previous box and action (also serves as a flag so that\n            // we don't repeat this branche).\n            command.action = cmdName\n            command.data.previous[changedAttribute] = joint.util.clone(cell.previous(changedAttribute))\n            command.options = options || {}\n            if (isGraphCommand) {\n                command.graphChange = true\n            } else {\n                command.data.id = cell.id\n                command.data.type = cell.attributes.type\n            }\n        }\n\n        command.data.next[changedAttribute] = joint.util.clone(cell.get(changedAttribute))\n\n        this.push(command)\n    },\n\n    // Batch commands are those that merge certain commands applied in a row (1) and those that\n    // hold multiple commands where one action consists of more than one command (2)\n    // (1) This is useful for e.g. when the user is dragging an object in the paper which would\n    // normally lead to 1px translation commands. Applying undo() on such commands separately is\n    // most likely undesirable.\n    // (2) e.g When you are removing an element, you don't want all links connected to that element, which\n    // are also being removed to be part of different command\n\n    initBatchCommand: function() {\n\n        if (!this.batchCommand) {\n\n            this.batchCommand = [this.createCommand({ batch:  true })]\n            this.lastCmdIndex = -1\n\n            // batch level counts how many times has been initBatchCommand executed.\n            // It is useful when we doing an operation recursively.\n            this.batchLevel = 0\n\n        } else {\n\n            // batch command is already active\n            this.batchLevel++\n        }\n    },\n\n    storeBatchCommand: function() {\n\n        // In order to store batch command it is necesary to run storeBatchCommand as many times as\n        // initBatchCommand was executed\n        if (this.batchCommand && this.batchLevel <= 0) {\n\n            const batchCommand = this.filterBatchCommand(this.batchCommand)\n            // checking if there is any valid command in batch\n            // for example: calling `initBatchCommand` immediately followed by `storeBatchCommand`\n            if (batchCommand.length > 0) {\n\n                this.redoStack = []\n\n                this.undoStack.push(batchCommand)\n                this.trigger('add', batchCommand)\n            }\n\n            this.batchCommand = null\n            this.lastCmdIndex = null\n            this.batchLevel = null\n\n        } else if (this.batchCommand && this.batchLevel > 0) {\n\n            // low down batch command level, but not store it yet\n            this.batchLevel--\n        }\n    },\n\n    // Takes batch commands and returns only such commands, which when applied in order change the graph.\n    filterBatchCommand: function(batchCommand) {\n\n        let commands = batchCommand.slice()\n        const filteredCommands = []\n\n        while (commands.length > 0) {\n\n            const command = commands.shift()\n            var {id} = command.data\n\n            if (command.action == null || (id == null && !command.graphChange)) {\n                continue\n            }\n\n            if (command.action === 'add') {\n\n                var removeIndex = commands.findIndex(function(item) {\n                    return item.action === 'remove' && item.data && item.data.id === id\n                })\n                if (removeIndex >= 0) {\n                    // `add` command followed by `remove` command\n                    // Lets remove the `remove` command and all other commands related to\n                    // this cell. Note that no commands can exist after the `remove` command,\n                    // but some could inbetween `add` and `remove`.\n                    // e.g.  . ADD . CHNG . REM . => . . . .\n                    commands = commands.filter(function(cmd, index) {\n                        return index > removeIndex || cmd.data.id !== id\n                    })\n                    continue\n                }\n\n            } else if (command.action === 'remove') {\n\n                const addIndex = commands.findIndex(function(item) {\n                    return item.action === 'add' && item.data && item.data.id == id\n                })\n                if (addIndex >= 0) {\n                    // `remove` command followed by `add` command\n                    // Lets remove only the `add` command. Note that another commands could exist\n                    // after the `add` command, but not inbetween `remove` and `add`.\n                    // e.g. . CHNG1 . REM . ADD . CHNG2 . ==> . CHNG1 . . . CHNG2 .\n                    commands.splice(addIndex, 1)\n                    continue\n                }\n\n            } else if (command.action.indexOf('change') === 0) {\n\n                if (joint.util.isEqual(command.data.previous, command.data.next)) {\n                    // This is a command which when applied doesn't actually change anything.\n                    continue\n                }\n            }\n\n            // This is a valid command.\n            filteredCommands.push(command)\n        }\n\n        return filteredCommands\n    },\n\n    revertCommand: function(command, opt) {\n\n        this.stopListening()\n\n        let batchCommand\n        if (Array.isArray(command)) {\n            batchCommand = this.constructor.sortBatchCommands(command)\n        } else {\n            batchCommand = [command]\n        }\n\n        const {graph} = this\n        for (let i = batchCommand.length - 1; i >= 0; i--) {\n\n            const cmd = batchCommand[i]\n            const model = cmd.graphChange ? graph : graph.getCell(cmd.data.id)\n            const cmdOpt = joint.util.assign({\n                commandManager: this.id || this.cid\n            }, opt, joint.util.pick(cmd.options, this.get('revertOptionsList')))\n\n            switch (cmd.action) {\n                case 'add':\n                    model.remove(cmdOpt)\n                    break\n\n                case 'remove':\n                    graph.addCell(cmd.data.attributes, cmdOpt)\n                    break\n\n                default:\n                    var attribute = cmd.action.substr(this.PREFIX_LENGTH)\n                    model.set(attribute, cmd.data.previous[attribute], cmdOpt)\n                    break\n            }\n        }\n\n        this.listen()\n    },\n\n    applyCommand: function(command, opt) {\n\n        this.stopListening()\n\n        let batchCommand\n        if (Array.isArray(command)) {\n            batchCommand = this.constructor.sortBatchCommands(command)\n        } else {\n            batchCommand = [command]\n        }\n\n        const {graph} = this\n        for (let i = 0; i < batchCommand.length; i++) {\n\n            const cmd = batchCommand[i]\n            const model = cmd.graphChange ? graph : graph.getCell(cmd.data.id)\n            const cmdOpt = joint.util.assign({\n                commandManager: this.id || this.cid\n            }, opt, joint.util.pick(cmd.options, this.get('applyOptionsList')))\n\n            switch (cmd.action) {\n\n                case 'add':\n                    graph.addCell(cmd.data.attributes, cmdOpt)\n                    break\n\n                case 'remove':\n                    model.remove(cmdOpt)\n                    break\n\n                default:\n                    var attribute = cmd.action.substr(this.PREFIX_LENGTH)\n                    model.set(attribute, cmd.data.next[attribute], cmdOpt)\n                    break\n            }\n        }\n\n        this.listen()\n    },\n\n    undo: function(opt) {\n\n        const command = this.undoStack.pop()\n\n        if (command) {\n\n            this.revertCommand(command, opt)\n            this.redoStack.push(command)\n        }\n    },\n\n    redo: function(opt) {\n\n        const command = this.redoStack.pop()\n\n        if (command) {\n\n            this.applyCommand(command, opt)\n            this.undoStack.push(command)\n        }\n    },\n\n    cancel: function(opt) {\n\n        if (this.hasUndo()) {\n\n            this.revertCommand(this.undoStack.pop(), opt)\n            this.redoStack = []\n        }\n    },\n\n    reset: function() {\n\n        this.undoStack = []\n        this.redoStack = []\n    },\n\n    hasUndo: function() {\n\n        return this.undoStack.length > 0\n    },\n\n    hasRedo: function() {\n\n        return this.redoStack.length > 0\n    }\n}, {\n\n    sortBatchCommands: function(commands) {\n\n        // Note that `filterBatchCommand` method makes sure there is no `add` and `remove`\n        // command in the same batch for the same element.\n\n        // Here we swap only commands related to the same element, where `change` command\n        // is before an `add` command (similary for the `remove` event).\n\n        const commandsSorted = []\n        for (let index = 0; index < commands.length; index++) {\n\n            const command = commands[index]\n            let insertPosition = null\n\n            if (command.action === 'add') {\n                const {id} = command.data\n\n                for (let i = 0; i < index; i++) {\n\n                    if (commands[i].data.id === id) {\n                        // add command should appear before the first change command\n                        insertPosition = i - 1\n                        break\n                    }\n                }\n            }\n\n            if (insertPosition !== null) {\n                commandsSorted.splice(insertPosition, 0, command)\n\n            } else {\n                commandsSorted.push(command)\n            }\n        }\n\n        return commandsSorted\n    }\n\n})\n\njoint.dia.Validator = Backbone.Model.extend({\n\n    initialize: function(options) {\n\n        this._map = {}\n        this._commandManager = options.commandManager\n\n        this.listenTo(this._commandManager, 'add', this._onCommand)\n    },\n\n    defaults: {\n\n        // To cancel (= undo + delete from redo stack) a command if is not valid.\n        cancelInvalid: true\n    },\n\n    // iterates throught each command, stops on first invalid command.\n    _onCommand: function(command) {\n\n        if (Array.isArray(command)) {\n            return command.find(function(singleCmd) { return !this._validateCommand(singleCmd) }, this)\n        }\n\n        return this._validateCommand(command)\n    },\n\n    // check whether the command is not against any rule\n    _validateCommand: function(command) {\n\n        // Backbone.model set() and Backbone.collection add() allow to pass an option parameter.\n        // That is also kept within the command. It skips validation if requested.\n        if (command.options && command.options.validation === false) return true\n\n        let handoverErr\n\n        joint.util.toArray(this._map[command.action]).forEach(function(route) {\n\n            let i = 0\n\n            function callbacks(err) {\n\n                const fn = route[i++]\n\n                try {\n                    if (fn) {\n                        fn(err, command, callbacks)\n                    } else {\n                        handoverErr = err\n                        return\n                    }\n                } catch (err) {\n                    callbacks(err)\n                }\n            }\n\n            callbacks(handoverErr)\n        })\n\n        if (handoverErr) {\n\n            if (this.get('cancelInvalid')) this._commandManager.cancel()\n            this.trigger('invalid', handoverErr)\n            return false\n        }\n\n        //command is valid\n        return true\n    },\n\n\n    validate: function(actions) {\n\n        const callbacks = Array.prototype.slice.call(arguments, 1)\n\n        callbacks.forEach(function(callback) {\n            if (joint.util.isFunction(callback)) return\n            throw new Error(`${actions  } requires callback functions.`)\n        })\n\n        actions.split(' ').forEach(function(action) {\n            (this._map[action] = this._map[action] || []).push(callbacks)\n        }, this)\n\n        return this\n    }\n\n})\n\n// Various utility functions for graph construction.\n// =================================================\n\n// This plugin extends the `joint.dia.Graph` object with additional methods.\n\n\n// Construct a tree from JSON structure of the form:\n// `{ name: 'my label', children: [ { name: 'my label 2', children: [...] }, ...] }`\n// `parent` is the tree object, i.e. the top level node.\n// `opt.children` is the property specifying the children array. `'children'` is the default.\n// If `opt.children` is a function, it will called with the current node as an argument and should return an array of its child nodes.\n// `opt.makeElement` is a function that is passed the current tree node and returns a JointJS element for it.\n// `opt.makeLink` is a function that is passed a parent and child nodes and returns a JointJS link for the edge.\njoint.dia.Graph.prototype.constructTree = function(parent, opt, parentElement, collector) {\n\n    collector = collector || []\n\n    const children = joint.util.isFunction(opt.children) ? opt.children(parent) : parent[opt.children || 'children']\n\n    if (!parentElement) {\n\n        parentElement = opt.makeElement(parent)\n        collector.push(parentElement)\n    }\n\n    joint.util.toArray(children).forEach(function(child) {\n\n        const childElement = opt.makeElement(child)\n        const link = opt.makeLink(parentElement, childElement)\n        collector.push(childElement, link)\n\n        this.constructTree(child, opt, childElement, collector)\n\n    }, this)\n\n    return collector\n}\n\n// Returns an array of IDs of nodes on the shortest path between `source` and `target`.\n// `source` and `target` can either be elements or IDs of elemements.\n// `opt.weight` is an optional function returning a distance between two nodes.\n// If `opt.directed` is `true`, the algorithm will take link direction into account.\njoint.dia.Graph.prototype.shortestPath = function(source, target, opt) {\n\n    opt = opt || {}\n\n    const adjacencyList = {}\n    this.getLinks().forEach(function(link) {\n\n        const sourceId = link.get('source').id\n        const targetId = link.get('target').id\n        if (!adjacencyList[sourceId]) {\n            adjacencyList[sourceId] = []\n        }\n        if (!adjacencyList[targetId]) {\n            adjacencyList[targetId] = []\n        }\n\n        adjacencyList[sourceId].push(targetId)\n        if (!opt.directed) {\n            adjacencyList[targetId].push(sourceId)\n        }\n    })\n\n    const previous = joint.alg.Dijkstra(adjacencyList, source.id || source, opt.weight)\n\n    const path = []\n    let u = target.id || target\n    if (previous[u]) path.push(u)\n    while ((u = previous[u])) {\n        path.unshift(u)\n    }\n    return path\n}\n\n// PaperScroller\n// =============\n\n\n// `PaperScroller` wraps the paper root element and implements panning and centering of the paper.\n\n// Example usage:\n\n//      var paperScroller = new joint.ui.PaperScroller;\n//      var paper = new joint.dia.Paper({ el: paperScroller.el });\n//      paperScroller.options.paper = paper;\n//      $appElement.append(paperScroller.render().el);\n\n//      paperScroller.center();\n//      paper.on('blank:pointerdown', paperScroller.startPanning);\n\njoint.ui.PaperScroller = joint.mvc.View.extend({\n\n    className: 'paper-scroller',\n\n    options: {\n        paper: undefined,\n        // Default padding makes sure the paper inside the paperScroller is always panable\n        // all the way left, right, bottom and top.\n        // It also makes sure that there is always at least a fragment of the paper visible.\n        // Example usage:\n        //   padding: 10\n        //   padding: { left: 20, right: 20 }\n        //   padding: function() { return 10; }\n        padding: function() {\n\n            const clientSize = this.getClientSize()\n            const minVisibleSize = Math.max(this.options.minVisiblePaperSize, 1) || 1\n            const padding = {}\n\n            padding.left = padding.right = Math.max(clientSize.width - minVisibleSize, 0)\n            padding.top = padding.bottom = Math.max(clientSize.height - minVisibleSize, 0)\n\n            return padding\n        },\n        // Minimal size (px) of the paper that has to stay visible.\n        // Used by the default padding method only.\n        minVisiblePaperSize: 50,\n        autoResizePaper: false,\n        baseWidth: undefined,\n        baseHeight: undefined,\n        contentOptions: undefined,\n        cursor: 'default'\n    },\n\n    // Internal padding storage\n    _padding: { left: 0, top: 0 },\n\n    init: function() {\n\n        joint.util.bindAll(this, 'startPanning', 'stopPanning', 'pan', 'onBackgroundEvent')\n\n        const {paper} = this.options\n\n        // keep scale values for a quicker access\n        const initScale = paper.scale()\n        this._sx = initScale.sx\n        this._sy = initScale.sy\n\n        // if the base paper dimension is not specified use the paper size.\n        this.options.baseWidth === undefined && (this.options.baseWidth = paper.options.width)\n        this.options.baseHeight === undefined && (this.options.baseHeight = paper.options.height)\n\n        this.$background = $('<div/>').addClass('paper-scroller-background')\n            .css({ width: paper.options.width, height: paper.options.height })\n            .append(paper.el)\n            .appendTo(this.el)\n\n        this.listenTo(paper, 'scale', this.onScale)\n            .listenTo(paper, 'resize', this.onResize)\n            .listenTo(paper, 'beforeprint beforeexport', this.storeScrollPosition)\n            .listenTo(paper, 'afterprint afterexport', this.restoreScrollPosition)\n\n        // automatically resize the paper\n        if (this.options.autoResizePaper) {\n            this.listenTo(paper.model, 'change add remove reset', this.adjustPaper)\n            if (paper.options.async) {\n                this.listenTo(paper, 'render:done', this.adjustPaper)\n            }\n        }\n\n        this.delegateBackgroundEvents()\n        this.setCursor(this.options.cursor)\n    },\n\n    lock: function() {\n        this.$el.css('overflow', 'hidden')\n        return this\n    },\n\n    unlock: function() {\n        this.$el.css('overflow', 'scroll')\n        return this\n    },\n\n    setCursor: function(cursor) {\n\n        switch (cursor) {\n            case 'grab':\n                // Make a special case for the cursor above\n                // due to bad support across browsers.\n                // It's handled in `layout.css`.\n                this.$el.css('cursor', '')\n                break\n            default:\n                this.$el.css('cursor', cursor)\n                break\n        }\n\n        this.$el.attr('data-cursor', cursor)\n        this.options.cursor = cursor\n\n        return this\n    },\n\n    // Set up listeners for passing events from outside the paper to the paper\n    delegateBackgroundEvents: function(events) {\n\n        events || (events = joint.util.result(this.options.paper, 'events'))\n\n        const normalizedEvents = this.paperEvents = Object.keys(events || {}).reduce(normalizeEvents.bind(this), {})\n\n        Object.keys(normalizedEvents).forEach(delegateBackgroundEvent, this)\n\n        function normalizeEvents(res, event) {\n            const listener = events[event]\n            // skip events with selectors\n            if (event.indexOf(' ') === -1) {\n                res[event] = joint.util.isFunction(listener) ? listener : this.options.paper[listener]\n            }\n            return res\n        }\n\n        function delegateBackgroundEvent(event) {\n            // Sending event data with `guarded=false` to prevent events from\n            // being guarded by the paper.\n            this.delegate(event, { guarded: false }, this.onBackgroundEvent)\n        }\n\n        return this\n    },\n\n    // Pass the event outside the paper to the paper.\n    onBackgroundEvent: function(evt) {\n\n        if (this.$background.is(evt.target)) {\n            const listener = this.paperEvents[evt.type]\n            if (joint.util.isFunction(listener)) {\n                listener.apply(this.options.paper, arguments)\n            }\n        }\n    },\n\n    onResize: function() {\n\n        // Move scroller so the user sees the same area as before the resizing.\n        if (this._center) this.center(this._center.x, this._center.y)\n    },\n\n    onScale: function(sx, sy, ox, oy) {\n\n        this.adjustScale(sx, sy)\n\n        // update scale values for a quicker access\n        this._sx = sx\n        this._sy = sy\n\n        // Move scroller to scale origin.\n        if (ox || oy) this.center(ox, oy)\n    },\n\n    storeScrollPosition: function() {\n\n        this._scrollLeftBeforePrint = this.el.scrollLeft\n        this._scrollTopBeforePrint = this.el.scrollTop\n    },\n\n    restoreScrollPosition: function() {\n\n        // Set the paper element to the scroll position before printing.\n        this.el.scrollLeft = this._scrollLeftBeforePrint\n        this.el.scrollTop = this._scrollTopBeforePrint\n\n        // Clean-up.\n        this._scrollLeftBeforePrint = null\n        this._scrollTopBeforePrint = null\n    },\n\n    beforePaperManipulation: function() {\n\n        if (joint.env.test('msie') || joint.env.test('msedge')) {\n            // IE is trying to show every frame while we manipulate the paper.\n            // That makes the viewport kind of jumping while zooming for example.\n            // Make the paperScroller invisible fixes this.\n            // MSEDGE seems to have a problem with text positions after the animation.\n            this.$el.css('visibility', 'hidden')\n        }\n    },\n\n    afterPaperManipulation: function() {\n\n        if (joint.env.test('msie') || joint.env.test('msedge')) {\n            this.$el.css('visibility', 'visible')\n        }\n    },\n\n    clientToLocalPoint: function(x, y) {\n\n        const ctm = this.options.paper.matrix()\n\n        x += this.el.scrollLeft - this._padding.left - ctm.e\n        x /= ctm.a\n\n\n        y += this.el.scrollTop - this._padding.top - ctm.f\n        y /= ctm.d\n\n        return new g.Point(x, y)\n    },\n\n    localToBackgroundPoint: function(x, y) {\n\n        const localPoint = new g.Point(x, y)\n        const ctm = this.options.paper.matrix()\n        const padding = this._padding\n        return V.transformPoint(localPoint, ctm).offset(padding.left, padding.top)\n    },\n\n    adjustPaper: function() {\n\n        // store the current mid point of visible paper area, so we can center the paper\n        // to the same point after the resize\n        const clientSize = this.getClientSize()\n        this._center = this.clientToLocalPoint(clientSize.width / 2, clientSize.height / 2)\n\n        const options = joint.util.assign({\n            gridWidth: this.options.baseWidth,\n            gridHeight: this.options.baseHeight,\n            allowNewOrigin: 'negative'\n        }, this.options.contentOptions)\n\n        this.options.paper.fitToContent(this.transformContentOptions(options))\n\n        return this\n    },\n\n    adjustScale: function(sx, sy) {\n\n        const paperOptions = this.options.paper.options\n        const fx = sx / this._sx\n        const fy = sy / this._sy\n\n        this.options.paper.setOrigin(paperOptions.origin.x * fx, paperOptions.origin.y * fy)\n        this.options.paper.setDimensions(paperOptions.width * fx, paperOptions.height * fy)\n    },\n\n    // Recalculates content options taking the current scale into account.\n    transformContentOptions: function(opt) {\n\n        const sx = this._sx\n        const sy = this._sy\n\n        if (opt.gridWidth) opt.gridWidth *= sx\n        if (opt.gridHeight) opt.gridHeight *= sy\n        if (opt.minWidth) opt.minWidth *= sx\n        if (opt.minHeight) opt.minHeight *= sy\n\n        if (joint.util.isObject(opt.padding)) {\n            opt.padding = {\n                left: (opt.padding.left || 0) * sx,\n                right: (opt.padding.right || 0) * sx,\n                top: (opt.padding.top || 0) * sy,\n                bottom: (opt.padding.bottom || 0) * sy\n            }\n        } else if (joint.util.isNumber(opt.padding)) {\n            opt.padding *= sx\n        }\n\n        return opt\n    },\n\n    // Adjust the paper position so the point [x,y] (local units) is moved\n    // to the center of paperScroller element.\n    // If neither `x` nor `y` provided, center to paper center.\n    // If `x` or `y` not provided, only center in the dimensions we know.\n    // Difference from scroll() is that center() adds padding to paper to\n    // make sure x, y will actually be centered.\n    center: function(x, y, opt) {\n\n        const ctm = this.options.paper.matrix()\n\n        // the paper rectangle\n        // x1,y1 ---------\n        // |             |\n        // ----------- x2,y2\n        const x1 = -ctm.e\n        const y1 = -ctm.f\n        const x2 = x1 + this.options.paper.options.width\n        const y2 = y1 + this.options.paper.options.height\n\n        const xIsNumber = joint.util.isNumber(x)\n        const yIsNumber = joint.util.isNumber(y)\n\n        let localOpt\n\n        if (!xIsNumber && !yIsNumber) {\n            // no coordinates provided\n\n            localOpt = x\n\n            // find center of the paper\n            x = (x1 + x2) / 2\n            y = (y1 + y2) / 2\n\n        } else {\n            localOpt = opt\n\n            // if one of the coords not provided, substitute with middle\n            // of visible area in that dimension\n            const visibleAreaCenter = this.getVisibleArea().center()\n\n            if (xIsNumber) x *= ctm.a // convert x to local\n            else x = visibleAreaCenter.x // default\n\n            if (yIsNumber) y *= ctm.d // convert y to local\n            else y = visibleAreaCenter.y // default\n        }\n\n        const clientSize = this.getClientSize()\n\n        const p = this.getPadding()\n        const cx = clientSize.width / 2\n        const cy = clientSize.height / 2\n\n        // calculate paddings\n        const left = cx - p.left - x + x1\n        const right = cx - p.right + x - x2\n        const top = cy - p.top - y + y1\n        const bottom = cy - p.bottom + y - y2\n\n        this.addPadding(\n            Math.max(left, 0),\n            Math.max(right, 0),\n            Math.max(top, 0),\n            Math.max(bottom, 0)\n        )\n\n        this.scroll(x, y, localOpt)\n\n        return this\n    },\n\n    // Position the paper so that the center of content (local units) is at\n    // the center of client area.\n    centerContent: function(opt) {\n\n        return this.positionContent('center', opt)\n    },\n\n    // Position the paper so that the center of element (local units) is at\n    // the center of client area.\n    centerElement: function(element, opt) {\n\n        this.checkElement(element, 'centerElement')\n\n        return this.positionElement(element, 'center', opt)\n    },\n\n    // Position the paper so that the `positionName`-determined point of\n    // content is at `positionName`-determined point of client area.\n    positionContent: function(positionName, opt) {\n\n        const contentArea = this.options.paper.getContentArea() // local units\n        return this.positionRect(contentArea, positionName, opt)\n    },\n\n    // Position the paper so that the `positionName`-determined point of\n    // element area is at `positionName`-determined point of client area.\n    positionElement: function(element, positionName, opt) {\n\n        this.checkElement(element, 'positionElement')\n\n        const elementArea = element.getBBox() // local units\n        return this.positionRect(elementArea, positionName, opt)\n    },\n\n    // Position the paper so that the `positionName`-determined point of\n    // `rect` is at `positionName`-determined point of client area.\n    // For example, to position the paper so that the top-left corner of\n    // `rect` is in the top-left corner of client area and 10px away from\n    // edges:\n    // - `positionRect('top-left', { padding: 10 });`\n    positionRect: function(rect, positionName, opt) {\n\n        let point\n        switch (positionName) {\n            case 'center':\n                point = rect.center()\n                return this.positionPoint(point, '50%', '50%', opt)\n\n            case 'top':\n                point = rect.topMiddle()\n                return this.positionPoint(point, '50%', 0, opt)\n\n            case 'top-right':\n                point = rect.topRight()\n                return this.positionPoint(point, '100%', 0, opt)\n\n            case 'right':\n                point = rect.rightMiddle()\n                return this.positionPoint(point, '100%', '50%', opt)\n\n            case 'bottom-right':\n                point = rect.bottomRight()\n                return this.positionPoint(point, '100%', '100%', opt)\n\n            case 'bottom':\n                point = rect.bottomMiddle()\n                return this.positionPoint(point, '50%', '100%', opt)\n\n            case 'bottom-left':\n                point = rect.bottomLeft()\n                return this.positionPoint(point, 0, '100%', opt)\n\n            case 'left':\n                point = rect.leftMiddle()\n                return this.positionPoint(point, 0, '50%', opt)\n\n            case 'top-left':\n                point = rect.topLeft()\n                return this.positionPoint(point, 0, 0, opt)\n\n            default:\n                throw new Error(`Provided positionName ('${  positionName  }') was not recognized.`)\n        }\n    },\n\n    // Position the paper so that `point` is `x` and `y` away from the (left\n    // and top) edges of the client area.\n    // Optional padding from edges with `opt.padding`.\n    // Optional animation with `opt.animaiton`.\n    // Percentages are allowed; they are understood with reference to the area\n    // of the client area that is inside padding.\n    // Negative values/percentages mean start counting from the other edge of\n    // the client area (right and/or bottom).\n    positionPoint: function(point, x, y, opt) {\n\n        opt = opt || {}\n        const padding = joint.util.normalizeSides(opt.padding) // client units\n\n        const clientRect = new g.Rect(this.getClientSize())\n        const restrictedClientRect = clientRect.clone().moveAndExpand({\n            x: padding.left,\n            y: padding.top,\n            width: -padding.right - padding.left,\n            height: -padding.top - padding.bottom\n        })\n\n        const xIsPercentage = joint.util.isPercentage(x)\n        x = parseFloat(x) // ignores the final %\n        if (xIsPercentage) x = (x / 100) * Math.max(0, restrictedClientRect.width)\n        if (x < 0) x = restrictedClientRect.width + x // if negative, start counting from other edge\n\n        const yIsPercentage = joint.util.isPercentage(y)\n        y = parseFloat(y) // ignores the final %\n        if (yIsPercentage) y = (y / 100) * Math.max(0, restrictedClientRect.height)\n        if (y < 0) y = restrictedClientRect.height + y // if negative, start counting from other edge\n\n        const target = restrictedClientRect.origin().offset(x, y) // client units\n        const center = clientRect.center()\n        const centerVector = center.difference(target)\n\n        const scale = this.zoom()\n\n        const localCenterVector = centerVector.scale(1 / scale, 1 / scale) // local units\n        const localCenter = point.clone().offset(localCenterVector)\n        return this.center(localCenter.x, localCenter.y, opt)\n    },\n\n    // Put the point at [x,y] in the paper (local units) to the center of\n    // paperScroller window.\n    // Less aggresive than center() as it only changes position of scrollbars\n    // without adding paddings - it won't actually move view onto the position\n    // if there isn't enough room for it!\n    // If `x` or `y` is not provided, only scroll in the directions we know.\n    // Optionally you can specify `animation` key in option argument\n    // to make the scroll animated; object is passed into $.animate\n    scroll: function(x, y, opt) {\n\n        const ctm = this.options.paper.matrix()\n\n        const clientSize = this.getClientSize()\n\n        const change = {}\n\n        if (joint.util.isNumber(x)) {\n            const cx = clientSize.width / 2\n            change.scrollLeft = x - cx + ctm.e + (this._padding.left || 0)\n        }\n\n        if (joint.util.isNumber(y)) {\n            const cy = clientSize.height / 2\n            change.scrollTop = y - cy + ctm.f + (this._padding.top || 0)\n        }\n\n        if (opt && opt.animation) this.$el.animate(change, opt.animation)\n        else this.$el.prop(change)\n    },\n\n    // Simple wrapper around scroll method that finds center of paper\n    // content and scrolls to it.\n    // Accepts same `opt` objects as the scroll() method (`opt.animation`).\n    scrollToContent: function(opt) {\n\n        const center = this.options.paper.getContentArea().center()\n        const sx = this._sx\n        const sy = this._sy\n\n        center.x *= sx\n        center.y *= sy\n\n        return this.scroll(center.x, center.y, opt)\n    },\n\n    // Simple wrapper around scroll method that finds center of specified\n    // element and scrolls to it.\n    // Accepts same `opt` objects as the scroll() method (`opt.animation`).\n    scrollToElement: function(element, opt) {\n\n        this.checkElement(element, 'scrollToElement')\n\n        const center = element.getBBox().center()\n        const sx = this._sx\n        const sy = this._sy\n\n        center.x *= sx\n        center.y *= sy\n\n        return this.scroll(center.x, center.y, opt)\n    },\n\n    // Position the paper inside the paper wrapper and resize the wrapper.\n    addPadding: function(left, right, top, bottom) {\n\n        const base = this.getPadding()\n\n        const padding = this._padding = {\n            left: Math.round(base.left + (left || 0)),\n            top: Math.round(base.top + (top || 0)),\n            bottom: Math.round(base.bottom + (bottom || 0)),\n            right: Math.round(base.right + (right || 0))\n        }\n\n        this.$background.css({\n            width: padding.left + this.options.paper.options.width + padding.right,\n            height: padding.top + this.options.paper.options.height + padding.bottom\n        })\n        this.options.paper.$el.css({\n            left: padding.left,\n            top: padding.top\n        })\n\n        return this\n    },\n\n    zoom: function(value, opt) {\n\n        if (value === undefined) {\n            return this._sx\n        }\n\n        opt = opt || {}\n\n        const clientSize = this.getClientSize()\n\n        const center = this.clientToLocalPoint(clientSize.width / 2, clientSize.height / 2)\n        let sx = value\n        let sy = value\n        let ox\n        let oy\n\n        if (!opt.absolute) {\n            sx += this._sx\n            sy += this._sy\n        }\n\n        if (opt.grid) {\n            sx = Math.round(sx / opt.grid) * opt.grid\n            sy = Math.round(sy / opt.grid) * opt.grid\n        }\n\n        // check if the new scale won't exceed the given boundaries\n        if (opt.max) {\n            sx = Math.min(opt.max, sx)\n            sy = Math.min(opt.max, sy)\n        }\n\n        if (opt.min) {\n            sx = Math.max(opt.min, sx)\n            sy = Math.max(opt.min, sy)\n        }\n\n        if (opt.ox === undefined || opt.oy === undefined) {\n\n            // if the origin is not specified find the center of the paper's visible area.\n            ox = center.x\n            oy = center.y\n\n        } else {\n\n            const fsx = sx / this._sx\n            const fsy = sy / this._sy\n\n            ox = opt.ox - ((opt.ox - center.x) / fsx)\n            oy = opt.oy - ((opt.oy - center.y) / fsy)\n        }\n\n        this.beforePaperManipulation()\n\n        this.options.paper.scale(sx, sy)\n        this.center(ox, oy)\n\n        this.afterPaperManipulation()\n\n        return this\n    },\n\n    zoomToFit: function(opt) {\n\n        opt = opt || {}\n\n        const {paper} = this.options\n        const paperOrigin = joint.util.assign({}, paper.options.origin)\n\n        // fitting bbox has exact size of the the PaperScroller\n        opt.fittingBBox = opt.fittingBBox || joint.util.assign({}, new g.Point(paperOrigin), {\n            width: this.$el.width(),\n            height: this.$el.height()\n        })\n\n        this.beforePaperManipulation()\n\n        // scale the vieport\n        paper.scaleContentToFit(opt)\n\n        // restore original origin\n        paper.setOrigin(paperOrigin.x, paperOrigin.y)\n\n        this.adjustPaper().centerContent()\n\n        this.afterPaperManipulation()\n\n        return this\n    },\n\n    transitionClassName: 'transition-in-progress',\n    transitionEventName: 'transitionend.paper-scroller-transition',\n\n    transitionToPoint: function(x, y, opt) {\n\n        // Allow both `transition(point, options)` and `transition(x, y, options)`\n        if (joint.util.isObject(x)) {\n            opt = y\n            y = x.y\n            x = x.x\n        }\n\n        opt || (opt = {})\n\n        const oldScale = this._sx\n        const scale = Math.max(opt.scale || oldScale, 1e-6)\n\n        const clientSize = this.getClientSize()\n\n        const localPoint = new g.Point(x, y)\n        const localCenter = this.clientToLocalPoint(clientSize.width / 2, clientSize.height / 2)\n        let transform; let transformOrigin\n\n        if (oldScale === scale) {\n            // Tranlate only\n            const translate = localCenter.difference(localPoint).scale(oldScale, oldScale).round()\n            transform = `translate(${  translate.x  }px,${  translate.y  }px)`\n\n        } else {\n            // Translate and scale concurrently\n            const distance = scale / (oldScale - scale) * localPoint.distance(localCenter)\n            const localOrigin = localCenter.clone().move(localPoint, distance)\n            const origin = this.localToBackgroundPoint(localOrigin).round()\n            transform = `scale(${  scale / oldScale  })`\n            transformOrigin = `${origin.x  }px ${  origin.y  }px`\n        }\n\n        this.$el\n            .addClass(this.transitionClassName)\n        this.$background\n            .off(this.transitionEventName)\n            .on(this.transitionEventName, function(evt) {\n\n                const {paperScroller} = this\n                paperScroller.syncTransition(this.scale, { x: this.x, y: this.y })\n                // Trigger a callback\n                const {onTransitionEnd} = this\n                if (joint.util.isFunction(onTransitionEnd)) {\n                    onTransitionEnd.call(paperScroller, evt)\n                }\n            }.bind({\n                // TransitionEnd handler context\n                paperScroller: this,\n                scale: scale,\n                x: x,\n                y: y,\n                onTransitionEnd: opt.onTransitionEnd\n            }))\n            .css({\n                transition: 'transform',\n                transitionDuration: opt.duration || '1s',\n                transitionDelay: opt.delay,\n                transitionTimingFunction: opt.timingFunction,\n                transformOrigin: transformOrigin,\n                transform: transform\n            })\n\n        return this\n    },\n\n    syncTransition: function(scale, center) {\n\n        this.beforePaperManipulation()\n\n        this.options.paper.scale(scale)\n\n        this.removeTransition()\n            .center(center.x, center.y)\n\n        this.afterPaperManipulation()\n\n        return this\n    },\n\n    removeTransition: function() {\n\n        this.$el\n            .removeClass(this.transitionClassName)\n        this.$background\n            .off(this.transitionEventName)\n            .css({\n                transition: '',\n                transitionDuration: '',\n                transitionDelay: '',\n                transitionTimingFunction: '',\n                transform: '',\n                transformOrigin: ''\n            })\n\n        return this\n    },\n\n    transitionToRect: function(rect, opt) {\n\n        rect = new g.Rect(rect)\n        opt || (opt = {})\n\n        const maxScale = opt.maxScale || Infinity\n        const minScale = opt.minScale || Number.MIN_VALUE\n        const scaleGrid = opt.scaleGrid || null\n        const visibility = opt.visibility || 1\n        const center = (opt.center) ? new g.Point(opt.center) : rect.center()\n\n        const clientSize = this.getClientSize()\n\n        const clientWidth = clientSize.width * visibility\n        const clientHeight = clientSize.height * visibility\n        const clientRect = new g.Rect({\n            x: center.x - clientWidth / 2,\n            y: center.y - clientHeight / 2,\n            width: clientWidth,\n            height: clientHeight\n        })\n\n        // scale the paper so all the corner points are in the viewport.\n        let scale = clientRect.maxRectUniformScaleToFit(rect, center)\n        scale = Math.min(scale, maxScale)\n        if (scaleGrid) {\n            scale = Math.floor(scale / scaleGrid) * scaleGrid\n        }\n        scale = Math.max(minScale, scale)\n\n        return this.transitionToPoint(center, joint.util.defaults({ scale: scale }, opt))\n    },\n\n    startPanning: function(evt) {\n\n        evt = joint.util.normalizeEvent(evt)\n\n        this._clientX = evt.clientX\n        this._clientY = evt.clientY\n\n        this.$el.addClass('is-panning')\n        this.trigger('pan:start', evt)\n\n        $(document.body).on({\n            'mousemove.panning touchmove.panning': this.pan,\n            'mouseup.panning touchend.panning': this.stopPanning\n        })\n\n        $(window).on('mouseup.panning', this.stopPanning)\n    },\n\n    pan: function(evt) {\n\n        evt = joint.util.normalizeEvent(evt)\n\n        const dx = evt.clientX - this._clientX\n        const dy = evt.clientY - this._clientY\n\n        this.el.scrollTop -= dy\n        this.el.scrollLeft -= dx\n\n        this._clientX = evt.clientX\n        this._clientY = evt.clientY\n    },\n\n    stopPanning: function(evt) {\n\n        $(document.body).off('.panning')\n        $(window).off('.panning')\n        this.$el.removeClass('is-panning')\n        this.trigger('pan:stop', evt)\n    },\n\n    // Return the client dimensions in pixels as reported by browser.\n    // \"What is the size of the window through which the user can see the paper?\"\n    getClientSize: function() {\n\n        return { width: this.el.clientWidth, height: this.el.clientHeight }\n    },\n\n    getPadding: function() {\n\n        let {padding} = this.options\n        if (joint.util.isFunction(padding)) {\n            padding = padding.call(this)\n        }\n\n        return joint.util.normalizeSides(padding)\n    },\n\n    // Return the dimensions of the visible area in local units.\n    // \"What part of the paper can be seen by the user, taking zooming and panning into account?\"\n    getVisibleArea: function() {\n\n        const ctm = this.options.paper.matrix()\n        const clientSize = this.getClientSize() // client units\n\n        const area = {\n            x: this.el.scrollLeft || 0,\n            y: this.el.scrollTop || 0,\n            width: clientSize.width,\n            height: clientSize.height\n        } // client units\n\n        const transformedArea = V.transformRect(area, ctm.inverse()) // local units\n\n        transformedArea.x -= (this._padding.left || 0) / this._sx\n        transformedArea.y -= (this._padding.top || 0) / this._sy\n\n        return new g.Rect(transformedArea)\n    },\n\n    isElementVisible: function(element, opt) {\n\n        this.checkElement(element, 'isElementVisible')\n\n        opt = opt || {}\n        const method = opt.strict ? 'containsRect' : 'intersect'\n        return !!this.getVisibleArea()[method](element.getBBox())\n    },\n\n    isPointVisible: function(point) {\n\n        return this.getVisibleArea().containsPoint(point)\n    },\n\n    // some method require element only because link is missing some tools (eg. bbox)\n    checkElement: function(element, methodName) {\n\n        if (!(element && element instanceof joint.dia.Element)) {\n            throw new TypeError(`ui.PaperScroller.${  methodName  }() accepts instance of joint.dia.Element only`)\n        }\n    },\n\n    onRemove: function() {\n\n        this.stopPanning()\n    }\n\n})\n\njoint.env.addTest('msie', function() {\n    const {userAgent} = window.navigator\n    return userAgent.indexOf('MSIE') !== -1 || userAgent.indexOf('Trident') !== -1\n})\n\njoint.env.addTest('msedge', function() {\n    return /Edge\\/\\d+/.test(window.navigator.userAgent)\n})\n\n// Selection\n// =============\n\n// `Selection` implements selecting group of elements and moving the selected elements in one go.\n// Typically, the selection will be bound to the `Shift` key\n// and selecting/deselecting individual elements to the `Ctrl` key.\n\n// Example usage:\n\n// var graph = new joint.dia.Graph;\n// var paper = new joint.dia.Paper({ model: graph });\n// var selectionItems = new Backbone.Collection;\n// var selection = new joint.ui.Selection({ paper: paper, graph: graph, model: selectionItems });\n\n// // Bulk selecting group of elements by creating a rectangular selection area.\n// paper.on('blank:pointerdown', selection.startSelecting);\n\n// // Selecting individual elements with click and the `Ctrl`/`Command` key.\n// paper.on('cell:pointerup', function(cellView, evt) {\n//      if ((evt.ctrlKey || evt.metaKey) && !(cellView.model instanceof joint.dia.Link)) {\n//              selectionItems.add(cellView.model);\n//      }\n// });\n\n// // Deselecting previously selected elements with click and the `Ctrl`/`Command` key.\n// selection.on('selection-box:pointerdown', function(evt) {\n//      if (evt.ctrlKey || evt.metaKey) {\n//              var cell = selectionItems.get($(evt.target).data('model'));\n//              selectionItems.reset(selectionItems.without(cell));\n//              selection.destroySelectionBox(paper.findViewByModel(cell));\n//      }\n// });\n\njoint.ui.Selection = joint.mvc.View.extend({\n\n    options: {\n        paper: undefined,\n        graph: undefined,\n        boxContent: function(boxElement) {\n            return joint.util.template('<%= length %> elements selected.')({\n                length: this.model.length\n            })\n        },\n        handles: [{\n            name: 'remove',\n            position: 'nw',\n            events: {\n                pointerdown: 'removeElements'\n            }\n        }, {\n            name: 'rotate',\n            position: 'sw',\n            events: {\n                pointerdown: 'startRotating',\n                pointermove: 'doRotate',\n                pointerup: 'stopBatch'\n            }\n        }, {\n            name: 'resize',\n            position: 'se',\n            events: {\n                pointerdown: 'startResizing',\n                pointermove: 'doResize',\n                pointerup: 'stopBatch'\n            }\n        }],\n        useModelGeometry: false,\n        strictSelection: false,\n        rotateAngleGrid: 15,\n        allowTranslate: true\n    },\n\n    className: 'selection',\n\n    events: {\n        'mousedown .selection-box': 'onSelectionBoxPointerDown',\n        'touchstart .selection-box': 'onSelectionBoxPointerDown',\n        'mousedown .handle': 'onHandlePointerDown',\n        'touchstart .handle': 'onHandlePointerDown'\n    },\n\n    /**\n     * @private\n     */\n    init: function() {\n\n        // For backwards compatibility:\n        if (this.options.model) {\n            this.options.collection = this.options.model\n        }\n\n        const collection = this.collection = this.options.collection || this.collection || new Backbone.Collection\n\n        if (!collection.comparator) {\n            // Make sure the elements are always sorted from the parents to their childs.\n            // That is necessary for translating selected elements.\n            collection.comparator = this.constructor.depthComparator\n            collection.sort()\n        }\n\n        // For backwards compatibility:\n        this.model = collection\n\n        if (this.options.paper) {\n            // Allow selection to be initialized with a paper only.\n            joint.util.defaults(this.options, { graph: this.options.paper.model })\n        } else {\n            throw new Error('Selection: paper required')\n        }\n\n        joint.util.bindAll(this, 'startSelecting', 'stopSelecting', 'adjustSelection', 'pointerup')\n\n        $(document.body).on('mousemove.selection touchmove.selection', this.adjustSelection)\n        $(document).on('mouseup.selection touchend.selection', this.pointerup)\n\n        const {paper} = this.options\n        const {graph} = this.options\n\n        this.listenTo(graph, 'reset', this.cancelSelection)\n        this.listenTo(paper, 'scale translate', this.updateSelectionBoxes)\n        this.listenTo(graph, 'remove change', function(cell, opt) {\n            // Do not react on changes that happened inside the selection.\n            if (opt.selection !== this.cid)  {\n                this.updateSelectionBoxes()\n            }\n        })\n\n        this.listenTo(collection, 'remove', this.onRemoveElement)\n        this.listenTo(collection, 'reset', this.onResetElements)\n        this.listenTo(collection, 'add', this.onAddElement)\n\n        paper.$el.append(this.$el)\n\n        // A counter of existing boxes. We don't want to update selection boxes on\n        // each graph change when no selection boxes exist.\n        this._boxCount = 0\n\n        this.$selectionWrapper = this.createSelectionWrapper()\n\n        // Add handles.\n        this.handles = []\n        joint.util.toArray(this.options.handles).forEach(this.addHandle, this)\n    },\n\n    /**\n     * @private\n     */\n    cancelSelection: function() {\n\n        this.model.reset([], { ui: true })\n    },\n\n    /**\n     * @public\n     * @param {object} opt\n     * @returns {joint.ui.Selection}\n     */\n    addHandle: function(opt) {\n\n        this.handles.push(opt)\n\n        const $handle = $('<div/>', {\n            class: `handle ${  opt.position || ''  } ${  opt.name || ''}`,\n            'data-action': opt.name\n        })\n        if (opt.icon) {\n            $handle.css('background-image', `url(${  opt.icon  })`)\n        }\n\n        $handle.html(opt.content || '')\n\n        // `opt.attrs` allows for setting arbitrary attributes on the generated HTML.\n        // This object is of the form: `<selector> : { <attributeName> : <attributeValue>, ... }`\n        joint.util.setAttributesBySelector($handle, opt.attrs)\n\n        this.$selectionWrapper.append($handle)\n\n        joint.util.forIn(opt.events, function(method, event) {\n\n            if (joint.util.isString(method)) {\n                this.on(`action:${  opt.name  }:${  event}`, this[method], this)\n            } else {\n                // Otherwise, it must be a function.\n                this.on(`action:${  opt.name  }:${  event}`, method)\n            }\n\n        }.bind(this))\n\n        return this\n    },\n\n    /**\n     * @public\n     * @param {jQuery.Event} evt\n     */\n    stopSelecting: function(evt) {\n\n        let localPoint\n        const {paper} = this.options\n\n        switch (this._action) {\n\n            case 'selecting':\n\n                var offset = this.$el.offset()\n                var width = this.$el.width()\n                var height = this.$el.height()\n\n                // Convert offset coordinates to the local point of the <svg> root element viewport.\n                localPoint = paper.pageToLocalPoint(offset.left, offset.top)\n\n                // Convert width and height to take current viewport scale into account\n                var paperScale = paper.scale()\n                width /= paperScale.sx\n                height /= paperScale.sy\n\n                var selectedArea = g.rect(localPoint.x, localPoint.y, width, height)\n                var elementViews = this.getElementsInSelectedArea(selectedArea)\n\n                var {filter} = this.options\n                if (Array.isArray(filter)) {\n\n                    elementViews = elementViews.filter(function(view) {\n                        return !filter.includes(view.model) && !filter.includes(view.model.get('type'))\n                    })\n\n                } else if (joint.util.isFunction(filter)) {\n\n                    elementViews = elementViews.filter(function(view) {\n                        return !filter(view.model)\n                    })\n                }\n\n                var models = elementViews.map(function(view) {\n                    return view.model\n                })\n                this.model.reset(models, { ui: true })\n\n                break\n\n            case 'translating':\n\n                this.options.graph.stopBatch('selection-translate')\n                localPoint = paper.snapToGrid({ x: evt.clientX, y: evt.clientY })\n                this.notify('selection-box:pointerup', evt, localPoint.x, localPoint.y)\n                // Everything else is done during the translation.\n                break\n\n            default:\n                // Hide selection if the user clicked somehwere else in the document.\n                if (!this._action) {\n                    this.cancelSelection()\n                }\n                break\n        }\n\n        this._action = null\n    },\n\n    /**\n     * @public\n     * @param {string} name\n     * @returns {joint.ui.Selection}\n     */\n    removeHandle: function(name) {\n\n        const handleIdx = joint.util.toArray(this.handles).findIndex(function(item) {\n            return item.name === name\n        })\n\n        const handle = this.handles[handleIdx]\n        if (handle) {\n\n            joint.util.forIn(handle.events, function(method, event) {\n                this.off(`action:${  name  }:${  event}`)\n            }.bind(this))\n\n            this.$(`.handle.${  name}`).remove()\n\n            this.handles.splice(handleIdx, 1)\n        }\n\n        return this\n    },\n\n    /**\n     * @public\n     * @param {jQuery.Event} evt\n     */\n    startSelecting: function(evt) {\n\n        evt = joint.util.normalizeEvent(evt)\n\n        this.cancelSelection()\n\n        const paperElement = this.options.paper.el\n        let offsetX; let offsetY\n\n        if (evt.offsetX != null && evt.offsetY != null && $.contains(paperElement, evt.target)) {\n\n            offsetX = evt.offsetX\n            offsetY = evt.offsetY\n\n        } else {\n\n            // We do not use `evt.offsetX` and `evt.offsetY` event properties when the event target\n            // is not inside the the paper element or properties are not defined (FF).\n\n            const paperOffset = $(paperElement).offset()\n            const paperScrollLeft = paperElement.scrollLeft\n            const paperScrollTop = paperElement.scrollTop\n\n            offsetX = evt.clientX - paperOffset.left + window.pageXOffset + paperScrollLeft\n            offsetY = evt.clientY - paperOffset.top + window.pageYOffset + paperScrollTop\n        }\n\n        this.$el.css({ width: 1, height: 1, left: offsetX, top: offsetY })\n        this.showLasso()\n\n        this._action = 'selecting'\n        this._clientX = evt.clientX\n        this._clientY = evt.clientY\n        this._offsetX = offsetX\n        this._offsetY = offsetY\n    },\n\n    /**\n     * @param {string} name\n     * @param {Object} opt\n     * @returns {joint.ui.Selection}\n     */\n    changeHandle: function(name, opt) {\n\n        const handle = joint.util.toArray(this.handles).find(function(item) {\n            return item && item.name === name\n        })\n\n        if (handle) {\n\n            this.removeHandle(name)\n            this.addHandle(joint.util.merge({ name: name }, handle, opt))\n        }\n\n        return this\n    },\n\n    /**\n     * @private\n     * @param {jQuery.Event} evt\n     */\n    onSelectionBoxPointerDown: function(evt) {\n\n        evt.stopPropagation()\n        evt = joint.util.normalizeEvent(evt)\n\n        // Start translating selected elements.\n        if (this.options.allowTranslate) {\n            this.startTranslatingSelection(evt)\n        }\n\n        this._activeElementView = this.getCellView(evt.target)\n        const localPoint = this.options.paper.snapToGrid({ x: evt.clientX, y: evt.clientY })\n        this.notify('selection-box:pointerdown', evt, localPoint.x, localPoint.y)\n    },\n\n    /**\n     * @private\n     * @param {jQuery.Event} evt\n     */\n    startTranslatingSelection: function(evt) {\n\n        this._action = 'translating'\n\n        this.options.graph.startBatch('selection-translate')\n\n        const snappedClientCoords = this.options.paper.snapToGrid({ x: evt.clientX, y: evt.clientY })\n        this._snappedClientX = snappedClientCoords.x\n        this._snappedClientY = snappedClientCoords.y\n    },\n\n    /**\n     * @private\n     * @param {jQuery.Event} evt\n     */\n    adjustSelection: function(evt) {\n\n        evt = joint.util.normalizeEvent(evt)\n\n        let dx\n        let dy\n\n        switch (this._action) {\n\n            case 'selecting':\n\n                dx = evt.clientX - this._clientX\n                dy = evt.clientY - this._clientY\n\n                var left = parseInt(this.$el.css('left'), 10)\n                var top = parseInt(this.$el.css('top'), 10)\n\n                this.$el.css({\n                    left: dx < 0 ? this._offsetX + dx : left,\n                    top: dy < 0 ? this._offsetY + dy : top,\n                    width: Math.abs(dx),\n                    height: Math.abs(dy)\n                })\n                break\n\n            case 'translating':\n\n                var snappedClientCoords = this.options.paper.snapToGrid({ x: evt.clientX, y: evt.clientY })\n                var snappedClientX = snappedClientCoords.x\n                var snappedClientY = snappedClientCoords.y\n\n                dx = snappedClientX - this._snappedClientX\n                dy = snappedClientY - this._snappedClientY\n\n                // restrict to area\n                var restrictedArea = this.options.paper.getRestrictedArea()\n                if (restrictedArea) {\n\n                    const elements = this.model.toArray()\n                    const selectionBBox = this.options.graph.getCellsBBox(elements)\n\n                    // restrict movement to ensure that all elements within selection stay inside restricted area\n                    const minDx = restrictedArea.x - selectionBBox.x\n                    const minDy = restrictedArea.y - selectionBBox.y\n                    const maxDx = (restrictedArea.x + restrictedArea.width) - (selectionBBox.x + selectionBBox.width)\n                    const maxDy = (restrictedArea.y + restrictedArea.height) - (selectionBBox.y + selectionBBox.height)\n\n                    if (dx < minDx) dx = minDx\n                    if (dy < minDy) dy = minDy\n\n                    if (dx > maxDx) dx = maxDx\n                    if (dy > maxDy) dy = maxDy\n                }\n\n                if (dx || dy) {\n\n                    this.translateSelectedElements(dx, dy)\n\n                    if (!this.boxesUpdated) {\n\n                        const paperScale = this.options.paper.scale()\n\n                        // Translate each of the `selection-box` amd `selection-wrapper`.\n                        this.$el.children('.selection-box').add(this.$selectionWrapper)\n                            .css({\n                                left: `+=${  dx * paperScale.sx}`,\n                                top: `+=${  dy * paperScale.sy}`\n                            })\n\n                    } else if (this.model.length > 1) {\n\n                        // If there is more than one cell in the selection, we need to update\n                        // the selection boxes again. e.g when the first element went over the\n                        // edge of the paper, a translate event was triggered, which updated the selection\n                        // boxes. After that all remaining elements were translated but the selection\n                        // boxes stayed unchanged.\n                        this.updateSelectionBoxes()\n                    }\n\n                    this._snappedClientX = snappedClientX\n                    this._snappedClientY = snappedClientY\n                }\n\n                this.notify('selection-box:pointermove', evt, snappedClientX, snappedClientY)\n                break\n\n            default:\n                if (this._action) {\n                    this.pointermove(evt)\n                }\n                break\n        }\n\n        this.boxesUpdated = false\n    },\n\n    translateSelectedElements: function(dx, dy) {\n\n        // This hash of flags makes sure we're not adjusting vertices of one link twice.\n        // This could happen as one link can be an inbound link of one element in the selection\n        // and outbound link of another at the same time.\n        const processedCells = {}\n\n        this.model.each(function(element) {\n\n            // TODO: snap to grid.\n            if (processedCells[element.id]) return\n\n            // Make sure that selection won't update itself when not necessary\n            const opt = { selection: this.cid }\n\n            // Translate the element itself.\n            element.translate(dx, dy, opt)\n\n            element.getEmbeddedCells({ deep: true }).forEach(function(embed) {\n                processedCells[embed.id] = true\n            })\n\n            // Translate link vertices as well.\n            const connectedLinks = this.options.graph.getConnectedLinks(element)\n\n            connectedLinks.forEach(function(link) {\n\n                if (processedCells[link.id]) return\n\n                link.translate(dx, dy, opt)\n\n                processedCells[link.id] = true\n            })\n\n        }.bind(this))\n    },\n\n    /**\n     * @private\n     * @param {string} eventName\n     * @param {jQuery.Event} event\n     */\n    notify: function(eventName, event) {\n\n        const args = Array.prototype.slice.call(arguments, 1)\n        this.trigger.apply(this, [eventName, this._activeElementView].concat(args))\n    },\n\n    /**\n     * @private\n     * @param {g.rect} selectedArea\n     * @returns {Object.<string, joint.dia.Element>}\n     */\n    getElementsInSelectedArea: function(selectedArea) {\n\n        const {paper} = this.options\n\n        const filterOpt = {\n            strict: this.options.strictSelection\n        }\n\n        if (this.options.useModelGeometry) {\n            const models = paper.model.findModelsInArea(selectedArea, filterOpt)\n            return models.map(paper.findViewByModel, paper).filter(function(item) {\n                return !!item\n            })\n        }\n\n        return paper.findViewsInArea(selectedArea, filterOpt)\n    },\n\n    /**\n     * @private\n     * @param {jQuery.Event} evt\n     */\n    pointerup: function(evt) {\n\n        if (!this._action) return\n\n        this.triggerAction(this._action, 'pointerup', evt)\n        this.stopSelecting(evt)\n\n        this._activeElementView = null\n        this._action = null\n    },\n\n    /**\n     * @private\n     * @param {joint.dia.Element} element\n     */\n    destroySelectionBox: function(element) {\n\n        this.$(`[data-model=\"${  element.get('id')  }\"]`).remove()\n\n        if (this.$el.children('.selection-box').length === 0) {\n            this.hide()\n        }\n\n        this._boxCount = Math.max(0, this._boxCount - 1)\n    },\n\n    /**\n     * @private\n     */\n    hide: function() {\n        this.$el.removeClass('lasso selected')\n    },\n\n    /**\n     * @private\n     */\n    showSelected: function() {\n        this.$el.addClass('selected')\n    },\n\n    /**\n     * @private\n     */\n    showLasso: function() {\n        this.$el.addClass('lasso')\n    },\n\n    /**\n     * @private\n     */\n    destroyAllSelectionBoxes: function() {\n\n        this.hide()\n        this.$el.children('.selection-box').remove()\n        this._boxCount = 0\n    },\n\n    /**\n     * @private\n     * @param {joint.dia.Element} element\n     */\n    createSelectionBox: function(element) {\n\n        const elementView = element.findView(this.options.paper)\n        if (elementView) {\n            const viewBBox = elementView.getBBox({ useModelGeometry: this.options.useModelGeometry })\n            $('<div/>')\n                .addClass('selection-box')\n                .attr('data-model', element.get('id'))\n                .css({ left: viewBBox.x, top: viewBBox.y, width: viewBBox.width, height: viewBBox.height })\n                .appendTo(this.el)\n            this.showSelected()\n            this._boxCount++\n        }\n    },\n\n    /**\n     * @private\n     * @returns {jQuery}\n     */\n    createSelectionWrapper: function() {\n\n        const $selectionWrapper = $('<div/>', { class: 'selection-wrapper' })\n        const $box = $('<div/>', { class: 'box' })\n        $selectionWrapper.append($box)\n        $selectionWrapper.attr('data-selection-length', this.model.length)\n        this.$el.prepend($selectionWrapper)\n        return $selectionWrapper\n    },\n\n    /**\n     * @private\n     */\n    updateSelectionWrapper: function() {\n\n        // Find the position and dimension of the rectangle wrapping\n        // all the element views.\n        const origin = { x: Infinity, y: Infinity }\n        const corner = { x: 0, y: 0 }\n\n        this.model.each(function(cell) {\n\n            const view = this.options.paper.findViewByModel(cell)\n            if (view) {\n                const bbox = view.getBBox({ useModelGeometry: this.options.useModelGeometry })\n                origin.x = Math.min(origin.x, bbox.x)\n                origin.y = Math.min(origin.y, bbox.y)\n                corner.x = Math.max(corner.x, bbox.x + bbox.width)\n                corner.y = Math.max(corner.y, bbox.y + bbox.height)\n            }\n        }.bind(this))\n\n        this.$selectionWrapper.css({\n            left: origin.x,\n            top: origin.y,\n            width: (corner.x - origin.x),\n            height: (corner.y - origin.y)\n        }).attr('data-selection-length', this.model.length)\n\n        if (joint.util.isFunction(this.options.boxContent)) {\n\n            const $box = this.$('.box')\n            const content = this.options.boxContent.call(this, $box[0])\n\n            // don't append empty content. (the content might had been created inside boxContent()\n            if (content) {\n                $box.html(content)\n            }\n        }\n    },\n\n    /**\n     * @private\n     */\n    updateSelectionBoxes: function() {\n\n        if (!this._boxCount) return\n\n        this.hide()\n\n        const children = this.$el.children('.selection-box')\n        for (let i = 0, n = children.length; i < n; i++) {\n            const element = children[i]\n\n            const removedId = $(element).remove().attr('data-model')\n\n            // try to find an element with the same id in the selection collection and\n            // find the view for this model.\n            const removedModel = this.model.get(removedId)\n\n            if (removedModel) {\n                // The view doesn't need to exist on the paper anymore as we use this method\n                // as a handler for element removal.\n                this.createSelectionBox(removedModel)\n            }\n        }\n        this.updateSelectionWrapper()\n\n        // When an user drags selection boxes over the edge of the paper and the paper gets resized,\n        // we update the selection boxes here (giving them exact position) and we do not want\n        // the selection boxes to be shifted again based on the mousemove.\n        // See adjustSelection() method.\n        this.boxesUpdated = true\n    },\n\n    /**\n     * @private\n     */\n    onRemove: function() {\n\n        $(document.body).off('.selection', this.adjustSelection)\n        $(document).off('.selection', this.pointerup)\n    },\n\n    /**\n     * @private\n     * @param {jQuery.Event} evt\n     */\n    onHandlePointerDown: function(evt) {\n\n        this._action = $(evt.target).closest('.handle').attr('data-action')\n        if (this._action) {\n\n            evt.preventDefault()\n            evt.stopPropagation()\n            evt = joint.util.normalizeEvent(evt)\n\n            this._clientX = evt.clientX\n            this._clientY = evt.clientY\n            this._startClientX = this._clientX\n            this._startClientY = this._clientY\n\n            this.triggerAction(this._action, 'pointerdown', evt)\n        }\n    },\n\n    /**\n     * @private\n     * @param {HTMLElement} element\n     * @returns {joint.dia.Element}\n     */\n    getCellView: function(element) {\n\n        const cell = this.model.get(element.getAttribute('data-model'))\n        return cell && cell.findView(this.options.paper)\n    },\n\n    /**\n     * @private\n     * @param {jQuery.Event} evt\n     */\n    pointermove: function(evt) {\n\n        if (!this._action) return\n\n        const clientCoords = this.options.paper.snapToGrid({ x: evt.clientX, y: evt.clientY })\n        const oldClientCoords = this.options.paper.snapToGrid({ x: this._clientX, y: this._clientY })\n\n        const dx = clientCoords.x - oldClientCoords.x\n        const dy = clientCoords.y - oldClientCoords.y\n\n        this.triggerAction(this._action, 'pointermove', evt, dx, dy, evt.clientX - this._startClientX, evt.clientY - this._startClientY)\n\n        this._clientX = evt.clientX\n        this._clientY = evt.clientY\n    },\n\n    /**\n     * Trigger an action on the Selection object. `evt` is a DOM event\n     * @private\n     * @param {string} action\n     * @param {string} eventName abstracted JointJS event name (pointerdown, pointermove, pointerup).\n     * @param {jQuery.Event} evt\n     */\n    triggerAction: function(action, eventName, evt) {\n\n        const args = Array.prototype.slice.call(arguments, 2)\n        args.unshift(`action:${  action  }:${  eventName}`)\n        this.trigger.apply(this, args)\n    },\n\n    // Handle actions.\n\n    /**\n     * @private\n     * @param {joint.dia.Element} element\n     */\n    onRemoveElement: function(element) {\n\n        this.destroySelectionBox(element)\n        this.updateSelectionWrapper()\n    },\n\n    /**\n     * @private\n     * @param {Backbone.Collection.<joint.dia.Cell>} elements\n     */\n    onResetElements: function(elements) {\n\n        this.destroyAllSelectionBoxes()\n\n        elements.each(this.createSelectionBox.bind(this))\n\n        this.updateSelectionWrapper()\n    },\n\n    /**\n     * @private\n     * @param {joint.dia.Element} element\n     */\n    onAddElement: function(element) {\n\n        this.createSelectionBox(element)\n        this.updateSelectionWrapper()\n    },\n\n    /**\n     * @private\n     * @param {jQuery.Event} evt\n     */\n    removeElements: function(evt) {\n\n        // Store cells before `cancelSelection()` resets the selection collection.\n        const cells = this.collection.toArray()\n        this.cancelSelection()\n        this.options.graph.removeCells(cells, { selection: this.cid })\n    },\n\n    /**\n     * @private\n     * @param {jQuery.Event} evt\n     */\n    startRotating: function(evt) {\n\n        this.options.graph.trigger('batch:start')\n\n        const center = this.options.graph.getBBox(this.model.models).center()\n        const clientCoords = this.options.paper.snapToGrid({ x: evt.clientX, y: evt.clientY })\n        const initialAngles = this.model.toArray().reduce(function(res, element) {\n            res[element.id] = g.normalizeAngle(element.get('angle') || 0)\n            return res\n        }, {})\n\n        this._rotation = {\n            center: center,\n            clientAngle: g.point(clientCoords).theta(center),\n            initialAngles: initialAngles\n        }\n    },\n\n    /**\n     * @private\n     * @param {jQuery.Event} evt\n     */\n    startResizing: function(evt) {\n\n        const {paper} = this.options\n        const {graph} = this.options\n        const grid = paper.options.gridSize\n        const elements = this.model.toArray()\n\n        const selectionBBox = graph.getBBox(elements)\n        const elBBoxes = joint.util.invoke(elements, 'getBBox')\n        const minElWidth = elBBoxes.reduce(function(min, bBox) {\n            return bBox.width < min ? bBox.width : min\n        }, Infinity)\n        const minElHeight = elBBoxes.reduce(function(min, bBox) {\n            return bBox.height < min ? bBox.height : min\n        }, Infinity)\n\n        this._resize = {\n            cells: graph.getSubgraph(elements),\n            bbox: selectionBBox,\n            minWidth: grid * selectionBBox.width / minElWidth,\n            minHeight: grid * selectionBBox.height / minElHeight\n        }\n\n        graph.trigger('batch:start')\n    },\n\n    /**\n     * @param {jQuery.Event} evt\n     * @param {number} dx\n     * @param {number} dy\n     */\n    doResize: function(evt, dx, dy) {\n\n        const opt = this._resize\n        const {bbox} = opt\n        const prevWidth = bbox.width\n        const prevHeight = bbox.height\n        const width = Math.max(prevWidth + dx, opt.minWidth)\n        const height = Math.max(prevHeight + dy, opt.minHeight)\n\n        if (Math.abs(prevWidth - width) > 1e-3 || Math.abs(prevHeight - height) > 1e-3) {\n\n            this.options.graph.resizeCells(width, height, opt.cells, {\n                selection: this.cid\n            })\n\n            // update selection bbox\n            bbox.width = width\n            bbox.height = height\n\n            this.updateSelectionBoxes()\n        }\n    },\n\n    /**\n     * @private\n     * @param {jQuery.Event} evt\n     */\n    doRotate: function(evt) {\n\n        const rotation = this._rotation\n\n        // Calculate an angle between the line starting at mouse coordinates, ending at the centre\n        // of rotation and y-axis and deduct the angle from the start of rotation.\n        const angleGrid = this.options.rotateAngleGrid\n        const clientCoords = this.options.paper.snapToGrid({ x: evt.clientX, y: evt.clientY })\n        const theta = rotation.clientAngle - g.point(clientCoords).theta(rotation.center)\n\n        if (Math.abs(theta) > 1e-3) {\n\n            this.model.each(function(element) {\n                const newAngle = g.snapToGrid(rotation.initialAngles[element.id] + theta, angleGrid)\n                element.rotate(newAngle, true, rotation.center, { selection: this.cid })\n            }, this)\n\n            this.updateSelectionBoxes()\n        }\n    },\n\n    /**\n     * @private\n     */\n    stopBatch: function() {\n\n        this.options.graph.trigger('batch:stop')\n    },\n\n    /**\n     * @private\n     * Return the current action of the Selection.\n     * This can be one of:\n     * 'translating' | 'selecting' or any custom action.\n     * This is especially useful if you want to prevent from something happening\n     * while the selection is taking place (e.g. in the 'selecting' state and you are\n     * handling the mouseover event).\n     * @returns {string}\n     */\n    getAction: function() {\n\n        return this._action\n    }\n}, {\n\n    depthComparator: function(element) {\n        // Where depth is a number of ancestors.\n        return element.getAncestors().length\n    }\n})\n\n// An alias for backwards compatibility\njoint.ui.SelectionView = joint.ui.Selection\n\n// Implements Clipboard for copy-pasting elements.\n// Note that the clipboard is also able to copy elements and their associated links from one graph\n// and paste them to another.\n\n// Usage:\n\n//       var selection = new Backbone.Collection;\n//       var graph = new joint.dia.Graph;\n//       // ... now something that adds elements to the selection ...\n//       var clipboard = new joint.ui.Clipboard;\n//       KeyboardJS.on('ctrl + c', function() { clipboard.copyElements(selection, graph); });\n//       KeyboardJS.on('ctrl + v', function() { clipboard.pasteCells(graph); });\njoint.ui.Clipboard = Backbone.Collection.extend({\n    LOCAL_STORAGE_KEY: 'joint.ui.Clipboard.cells',\n    defaults: {\n        useLocalStorage: true\n    },\n    /**\n     * @public\n     * This function returns the elements and links from the original graph that were copied. This is useful for implements\n     * the Cut operation where the original cells should be removed from the graph. `selection` contains\n     * elements that should be copied to the clipboard. Note that with these elements, also all the associated\n     * links are copied. That's why we also need the `graph` parameter, to find these links.\n     *\n     * @param {Backbone.Collection} selection\n     * @param {joint.dia.Graph} graph\n     * @param {Object=} opt Used as a default for settings passed through the `pasteCells` method.\n     * @returns {Array.<joint.dia.Cell>}\n     */\n    copyElements: function(selection, graph, opt) {\n\n        this.options = joint.util.assign({}, this.defaults, opt)\n        opt = this.options\n\n        const originalElements = selection.toArray()\n        const clones = joint.util.sortBy(graph.cloneSubgraph(originalElements, opt), function(cell) {\n            return cell.isLink() ? 2 : 1\n        })\n\n        this.reset(clones)\n\n        if (opt.useLocalStorage && window.localStorage) {\n            localStorage.setItem(this.LOCAL_STORAGE_KEY, JSON.stringify(this.toJSON()))\n        }\n\n        return originalElements\n    },\n\n    /**\n     * @public\n     * Same logic as per `copyElements`, but elements are removed from the graph\n     * @param {Backbone.Collection} selection\n     * @param {joint.dia.Graph} graph\n     * @param {Object=} opt Used as a default for settings passed through the `pasteCells` method.\n     * @returns {Array.<joint.dia.Cell>} elements removed from graph\n     */\n    cutElements: function(selection, graph, opt) {\n\n        const elementsToRemove = this.copyElements(selection, graph, opt)\n        graph.trigger('batch:start', { batchName: 'cut' })\n        joint.util.invoke(elementsToRemove, 'remove')\n        graph.trigger('batch:stop', { batchName: 'cut' })\n        return elementsToRemove\n    },\n\n    /**\n     * @public\n     * @param {joint.dia.Graph} graph Where paste to.\n     * @param {Object.<{ translate: {dx: number, dy: number}, useLocalStorage: boolean, link: Object}>=} opt\n     * If `translate` object with `dx` and `dy` properties is passed, the copied elements will be\n     * translated by the specified amount. This is useful for e.g. the 'cut' operation where we'd like to have\n     * the pasted elements moved by an offset to see they were pasted to the paper.\n     *\n     * If `useLocalStorage` is `true`, the copied elements will be saved to the localStorage (if present)\n     * making it possible to copy-paste elements between browser tabs or sessions.\n     *\n     * `link` is attributes that will be set all links before they are added to the `graph`.\n     * This is useful for e.g. setting `z: -1` for links in order to always put them to the bottom of the paper.\n     * @returns {Array.<joint.dia.Cell>}\n     */\n    pasteCells: function(graph, opt) {\n\n        //use options passed into copyElements as defaults for paste\n        opt = joint.util.defaults(opt || {}, this.options)\n\n        if (opt.useLocalStorage && this.isEmpty() && window.localStorage) {\n\n            const graphJSON = {\n                cells: JSON.parse(localStorage.getItem(this.LOCAL_STORAGE_KEY))\n            }\n            // Note there is a `{ sort: false }` option passed to make sure\n            // the temporary graph does not change the order of cells.\n            // i.e. elements must stay before links\n            const tmpGraph = new joint.dia.Graph().fromJSON(graphJSON, { sort: false })\n            this.reset(tmpGraph.getCells())\n        }\n\n        //process modification on current data\n        const pastedCells = this.map(function(cell) {\n            return this.modifyCell(cell, opt)\n        }.bind(this))\n\n        graph.trigger('batch:start', { batchName: 'paste' })\n        graph.addCells(pastedCells)\n        graph.trigger('batch:stop', { batchName: 'paste' })\n\n        this.copyElements(this, graph)\n\n        return pastedCells\n    },\n\n    /**\n     * @public\n     */\n    clear: function() {\n\n        this.options = {}\n        this.reset([])\n\n        if (window.localStorage) {\n            localStorage.removeItem(this.LOCAL_STORAGE_KEY)\n        }\n    },\n\n    /**\n     * @private\n     * @param {joint.dia.Cell} cell\n     * @param {Object} opt\n     * @returns {joint.dia.Cell}\n     */\n    modifyCell: function(cell, opt) {\n\n        cell.unset('z')\n        if (cell.isLink() && opt.link) {\n            cell.set(opt.link)\n        }\n\n        if (opt.translate) {\n            cell.translate(opt.translate.dx || 20, opt.translate.dy || 20)\n        }\n\n        // It's necessary to unset the collection reference here. Backbone.Collection adds collection\n        // attribute to every new model, except if the model already has one. The pasted elements needs to have\n        // collection attribute set to the Graph collection (not the Selection collection).\n        cell.collection = null\n\n        return cell\n    }\n});\n\n(function(joint) {\n    \n\n    /**\n     * @constructor\n     */\n    const LinkHalo = function() {\n        this.options = {\n            handles: [\n                {\n                    name: 'remove',\n                    position: 'nw',\n                    events: { pointerdown: 'removeElement' },\n                    icon: null\n                },\n                {\n                    name: 'direction',\n                    position: 'se',\n                    events: { pointerdown: 'directionSwap' },\n                    icon: null\n                }\n            ],\n            bbox: function(cellView) {\n\n                const linkLength = cellView.getConnectionLength() * 0.5\n                return cellView.getPointAtLength(linkLength)\n            },\n            typeCssName: 'type-link',\n            tinyThreshold: -1,\n            smallThreshold: -1,\n            boxContent: false\n        }\n    }\n\n    /**\n     * @private\n     * Swap direction of the link.\n     */\n    LinkHalo.prototype.directionSwap = function() {\n        const {model} = this.options.cellView\n        model.set({ source: model.get('target'), target: model.get('source') }, { halo: this.cid })\n    }\n\n    /**\n     * @constructor\n     */\n    const ElementHalo = function() {\n        this.options = {\n            handles: [\n                {\n                    name: 'remove',\n                    position: 'nw',\n                    events: { pointerdown: 'removeElement' },\n                    icon: null\n                },\n                {\n                    name: 'resize',\n                    position: 'se',\n                    events: { pointerdown: 'startResizing', pointermove: 'doResize', pointerup: 'stopBatch' },\n                    icon: null\n                },\n                {\n                    name: 'clone',\n                    position: 'n',\n                    events: { pointerdown: 'startCloning', pointermove: 'doClone', pointerup: 'stopCloning' },\n                    icon: null\n                },\n                {\n                    name: 'link',\n                    position: 'e',\n                    events: { pointerdown: 'startLinking', pointermove: 'doLink', pointerup: 'stopLinking' },\n                    icon: null\n                },\n                {\n                    name: 'fork',\n                    position: 'ne',\n                    events: { pointerdown: 'startForking', pointermove: 'doFork', pointerup: 'stopForking' },\n                    icon: null\n                },\n                {\n                    name: 'unlink',\n                    position: 'w',\n                    events: { pointerdown: 'unlinkElement' },\n                    icon: null\n                },\n                {\n                    name: 'rotate',\n                    position: 'sw',\n                    events: { pointerdown: 'startRotating', pointermove: 'doRotate', pointerup: 'stopBatch' },\n                    icon: null\n                }\n            ],\n\n            /**\n             * @param {joint.dia.CellView} cellView\n             * @param {joint.ui.Halo} halo\n             * @returns {g.rect}\n             */\n            bbox: function(cellView, halo) {\n                return cellView.getBBox({ useModelGeometry: halo.options.useModelGeometry })\n            },\n            typeCssName: 'type-element',\n            tinyThreshold: 40,\n            smallThreshold: 80,\n\n            // a function returning a html string, which will be used as the halo box content\n            boxContent: function(elementView, boxElement) {\n                const tmpl = joint.util.template('x: <%= x %>, y: <%= y %>, width: <%= width %>, height: <%= height %>, angle: <%= angle %>')\n                const element = elementView.model\n                const bbox = element.getBBox()\n\n                return tmpl({\n                    x: Math.floor(bbox.x),\n                    y: Math.floor(bbox.y),\n                    width: Math.floor(bbox.width),\n                    height: Math.floor(bbox.height),\n                    angle: Math.floor(element.get('angle') || 0)\n                })\n            },\n\n            magnet: function(elementView) {\n                // elementView root element by default\n                return elementView.el\n            },\n\n            loopLinkPreferredSide: 'top',\n            loopLinkWidth: 40,\n            rotateAngleGrid: 15,\n\n            // Rest of options are deprecated (better use joint.dia.Paper.options.linkModel)\n            linkAttributes: {},\n            smoothLinks: undefined\n        }\n    }\n\n    ElementHalo.prototype.startLinking = function(evt, x, y) {\n\n        this.startBatch()\n\n        const {options} = this\n        const {paper} = options\n        const {graph} = options\n\n        const link = this.createLinkConnectedToSource()\n\n        // add link to graph but don't validate\n        link.set({\n            target: { x: x, y: y }\n        }).addTo(graph, {\n            validation: false,\n            halo: this.cid,\n            async: false\n        })\n\n        const linkView = this._linkView = link.findView(paper)\n        linkView.startArrowheadMove('target', { whenNotAllowed: 'remove' })\n    }\n\n    ElementHalo.prototype.startForking = function(evt, x, y) {\n\n        const {options} = this\n        const {paper} = options\n        const {graph} = options\n\n        this.startBatch()\n\n        const clone = options.clone(options.cellView.model, { fork: true })\n        if (!(clone instanceof joint.dia.Cell)) {\n            throw new Error('ui.Halo: option \"clone\" has to return a cell.')\n        }\n\n        this.centerElementAtCursor(clone, x, y)\n        clone.addTo(graph, {\n            halo: this.cid,\n            async: false\n        })\n\n        const link = this.createLinkConnectedToSource()\n        const cloneView = this._cloneView = clone.findView(paper)\n        const targetMagnet = this.getElementMagnet(cloneView, 'target')\n        const linkTarget = this.getLinkEnd(cloneView, targetMagnet)\n\n        link.set('target', linkTarget).addTo(graph, {\n            halo: this.cid,\n            async: false\n        })\n\n        cloneView.pointerdown(evt, x, y)\n    }\n\n    ElementHalo.prototype.getElementMagnet = function(elementView, endAttribute) {\n        const fn = this.options.magnet\n        if (joint.util.isFunction(fn)) {\n            const magnet = fn.call(this, elementView, endAttribute)\n            if (magnet instanceof SVGElement) {\n                return magnet\n            }\n        }\n        throw new Error('ui.Halo: magnet() has to return an SVGElement.')\n    },\n\n    ElementHalo.prototype.getLinkEnd = function(elementView, magnet) {\n        const end = { id: elementView.model.id }\n        if (magnet !== elementView.el) {\n            const port = magnet.getAttribute('port')\n            if (port) {\n                end.port = port\n            } else {\n                end.selector = elementView.getSelector(magnet)\n            }\n        }\n        return end\n    },\n\n    ElementHalo.prototype.createLinkConnectedToSource = function() {\n\n        const {options} = this\n        const {paper} = options\n        const elementView = options.cellView\n        const sourceMagnet = this.getElementMagnet(elementView, 'source')\n        const linkSource = this.getLinkEnd(elementView, sourceMagnet)\n        const link = paper.getDefaultLink(elementView, sourceMagnet).set('source', linkSource)\n\n        // Backwards compatibility\n        link.attr(options.linkAttributes)\n        if (joint.util.isBoolean(options.smoothLinks)) {\n            link.set('smooth', options.smoothLinks)\n        }\n\n        return link\n    },\n\n    ElementHalo.prototype.startResizing = function(evt) {\n\n        this.startBatch()\n\n        // determine whether to flip x,y mouse coordinates while resizing or not\n        this._flip = [1, 0, 0, 1, 1, 0, 0, 1][Math.floor(g.normalizeAngle(this.options.cellView.model.get('angle')) / 45)]\n    }\n\n    ElementHalo.prototype.startRotating = function(evt, x, y) {\n\n        this.startBatch()\n\n        const center = this.options.cellView.model.getBBox().center()\n        const angle = g.normalizeAngle(this.options.cellView.model.get('angle'))\n\n        this._center = center\n        this._rotationStartAngle = angle || 0\n        this._clientStartAngle = g.point(x, y).theta(center)\n    }\n\n    ElementHalo.prototype.doResize = function(evt, x, y, dx, dy) {\n\n        const size = this.options.cellView.model.get('size')\n\n        const width = Math.max(size.width + ((this._flip ? dx : dy)), 1)\n        const height = Math.max(size.height + ((this._flip ? dy : dx)), 1)\n\n        this.options.cellView.model.resize(width, height, { absolute: true })\n    }\n\n    ElementHalo.prototype.doRotate = function(evt, x, y) {\n\n        // Calculate an angle between the line starting at mouse coordinates, ending at the centre\n        // of rotation and y-axis and deduct the angle from the start of rotation.\n        const theta = this._clientStartAngle - g.point(x, y).theta(this._center)\n        const newAngle = g.snapToGrid(this._rotationStartAngle + theta, this.options.rotateAngleGrid)\n\n        this.options.cellView.model.rotate(newAngle, true)\n    }\n\n    ElementHalo.prototype.doClone = function(evt, x, y) {\n\n        const cloneView = this._cloneView\n        if (cloneView) {\n            cloneView.pointermove(evt, x, y)\n        }\n    }\n\n    ElementHalo.prototype.startCloning = function(evt, x, y) {\n\n        const {options} = this\n\n        this.startBatch()\n\n        const clone = options.clone(options.cellView.model, { clone: true })\n\n        if (!(clone instanceof joint.dia.Cell)) {\n            throw new Error('ui.Halo: option \"clone\" has to return a cell.')\n        }\n\n        this.centerElementAtCursor(clone, x, y)\n        clone.addTo(options.graph, { halo: this.cid, async: false })\n\n        this._cloneView = clone.findView(options.paper)\n        this._cloneView.pointerdown(evt, x, y)\n    }\n\n    ElementHalo.prototype.centerElementAtCursor = function(element, x, y) {\n\n        const center = element.getBBox().center()\n        const tx = x - center.x\n        const ty = y - center.y\n\n        element.translate(tx, ty)\n    }\n\n    ElementHalo.prototype.doFork = function(evt, x, y) {\n\n        const cloneView = this._cloneView\n        if (cloneView) {\n            cloneView.pointermove(evt, x, y)\n        }\n    }\n\n    ElementHalo.prototype.doLink = function(evt, x, y) {\n\n        if (this._linkView) {\n            this._linkView.pointermove(evt, x, y)\n        }\n    }\n\n    ElementHalo.prototype.stopLinking = function(evt) {\n\n        if (this._linkView) {\n\n            this._linkView.pointerup(evt)\n\n            if (this._linkView.model.hasLoop()) {\n                this.makeLoopLink(this._linkView.model)\n            }\n\n            this.stopBatch()\n            this.triggerAction('link', 'add', this._linkView.model)\n            this._linkView = null\n        }\n    }\n\n    ElementHalo.prototype.stopForking = function(evt, x, y) {\n\n        const cloneView = this._cloneView\n        if (cloneView) {\n            cloneView.pointerup(evt, x, y)\n        }\n        this.stopBatch()\n    }\n\n    ElementHalo.prototype.stopCloning = function(evt, x, y) {\n\n        const cloneView = this._cloneView\n        if (cloneView) {\n            cloneView.pointerup(evt, x, y)\n        }\n        this.stopBatch()\n    }\n\n    ElementHalo.prototype.unlinkElement = function(evt) {\n\n        this.startBatch()\n        this.options.graph.removeLinks(this.options.cellView.model)\n        this.stopBatch()\n    }\n\n    ElementHalo.prototype.makeLoopLink = function(link) {\n        const linkWidth = this.options.loopLinkWidth\n        const paperOpt = this.options.paper.options\n        const paperRect = g.rect({ x: 0, y: 0, width: paperOpt.width, height: paperOpt.height })\n        const bbox = V(this.options.cellView.el).bbox(false, this.options.paper.viewport)\n        let p1; let p2\n\n        const sides = joint.util.uniq([this.options.loopLinkPreferredSide, 'top', 'bottom', 'left', 'right'])\n        const sideFound = sides.find(function(side) {\n\n            let centre\n            let dx = 0\n            let dy = 0\n\n            switch (side) {\n\n                case 'top':\n                    centre = g.point(bbox.x + bbox.width / 2, bbox.y - linkWidth)\n                    dx = linkWidth / 2\n                    break\n\n                case 'bottom':\n                    centre = g.point(bbox.x + bbox.width / 2, bbox.y + bbox.height + linkWidth)\n                    dx = linkWidth / 2\n                    break\n\n                case 'left':\n                    centre = g.point(bbox.x - linkWidth, bbox.y + bbox.height / 2)\n                    dy = linkWidth / 2\n                    break\n\n                case 'right':\n                    centre = g.point(bbox.x + bbox.width + linkWidth, bbox.y + bbox.height / 2)\n                    dy = linkWidth / 2\n                    break\n            }\n\n            p1 = g.point(centre).offset(-dx, -dy)\n            p2 = g.point(centre).offset(dx, dy)\n\n            return paperRect.containsPoint(p1) && paperRect.containsPoint(p2)\n\n        }, this)\n\n        if (sideFound) link.set('vertices', [p1, p2])\n\n    }\n\n    joint.ui.Halo = joint.mvc.View.extend({\n\n        PIE_INNER_RADIUS: 20,\n        PIE_OUTER_RADIUS: 50,\n\n        className: 'halo',\n\n        events: {\n            'mousedown .handle': 'onHandlePointerDown',\n            'touchstart .handle': 'onHandlePointerDown',\n            'mousedown .pie-toggle': 'onPieTogglePointerDown',\n            'touchstart .pie-toggle': 'onPieTogglePointerDown'\n        },\n        documentEvents: {\n            mousemove: 'pointermove',\n            touchmove: 'pointermove',\n            mouseup: 'pointerup',\n            touchend: 'pointerup'\n        },\n        options: {\n            clearAll: true,\n            clearOnBlankPointerdown: true,\n            // This option allows you to compute bbox from the model. The view bbox can sometimes return\n            // an unwanted result e.g when an element uses SVG filters or clipPaths. Note that downside\n            // of computing a bbox is that it takes no relative subelements into account (e.g ports).\n            useModelGeometry: false,\n            // A function returning a copy of given cell used in cloning and forking.\n            // Useful e.g. when you wish to translate the clone after it's created.\n            // Note that clone is not in the graph when the function is invoked.\n            clone: function(cell, opt) {\n                return cell.clone().unset('z')\n            },\n            // Type of the halo. Determines the look of the halo (esp. positioning of handles).\n            type: 'surrounding',\n            // Various options for a specific types.\n            pieSliceAngle: 45,\n            pieStartAngleOffset: 0,\n            pieIconSize: 14,\n            // Pie toggle buttons. Usually, there is only one but in general, there can be\n            // many. Each button can have a position (e ... east, w ... west, s ... south, n ... north)\n            // and name. This name is then used when triggering events when the pie toggle button\n            // is clicked (pie:open:default / pie:close:default).\n            pieToggles: [{ name: 'default', position: 'e' }]\n        },\n\n        /**\n         * @protected\n         */\n        init: function() {\n\n            const {options} = this\n            const {cellView} = options\n            const cell = cellView.model\n            const cellViewAbstract = cell.isLink() ? new LinkHalo() : new ElementHalo()\n\n            joint.util.assign(this, joint.util.omit(cellViewAbstract, 'options'))\n\n            const {paper} = cellView\n            const graph = paper.model\n\n            joint.util.defaults(options, cellViewAbstract.options, {\n                paper: paper,\n                graph: graph\n            })\n\n            joint.util.bindAll(this, 'render', 'update')\n\n            if (options.clearAll) {\n                // Clear a previous halo if there was one for the paper.\n                this.constructor.clear(paper)\n            }\n\n            // Update halo when the graph changed.\n            this.listenTo(graph, 'reset', this.remove)\n            this.listenTo(cell, 'remove', this.remove)\n            this.listenTo(paper, 'halo:create', this.remove)\n            if (options.clearOnBlankPointerdown) {\n                // Hide Halo when the user clicks anywhere in the paper\n                this.listenTo(paper, 'blank:pointerdown', this.remove)\n            }\n\n            this.listenTo(graph, 'all', this.update)\n            this.listenTo(paper, 'scale translate', this.update)\n\n            // Add all default handles first.\n            this.handles = []\n\n            joint.util.toArray(options.handles).forEach(this.addHandle, this)\n        },\n\n        /**\n         * @public\n         * @returns {joint.ui.Halo}\n         */\n        render: function() {\n\n            const {options} = this\n\n            this.$el.empty()\n            this.$handles = $('<div/>').addClass('handles').appendTo(this.el)\n            this.$box = $('<label/>').addClass('box').appendTo(this.el)\n            // A cache for pie toggle buttons in the form [toggleName] -> [$pieToggle].\n            this.$pieToggles = {}\n\n            // Add halo type for css styling purposes.\n            this.$el.addClass(options.type)\n            this.$el.addClass(this.cellTypeCssClass())\n\n            // Add the `data-type` attribute with the `type` of the cell to the root element.\n            // This makes it possible to style the halo (including hiding/showing actions) based\n            // on the type of the cell.\n            this.$el.attr('data-type', options.cellView.model.get('type'))\n\n            // Render handles.\n            this.$handles.append(joint.util.toArray(this.handles).map(this.renderHandle, this))\n\n            switch (options.type) {\n\n                case 'toolbar':\n                case 'surrounding':\n\n                    // If the cell can not connect itself with the clone of\n                    // itself due to the validate connection method, don't\n                    // display fork handle at all.\n                    if (this.hasHandle('fork')) {\n                        this.toggleFork()\n                    }\n\n                    break\n\n                case 'pie':\n\n                    // Pie halo has a button to toggle visibility of the\n                    // menu, that is not a handle (can't be added or removed).\n                    joint.util.toArray(this.options.pieToggles).forEach(function(opt) {\n                        const $pieToggle = $('<div/>')\n                        $pieToggle.addClass(`pie-toggle ${  opt.position || 'e'}`)\n                        $pieToggle.attr('data-name', opt.name)\n                        joint.util.setAttributesBySelector($pieToggle, opt.attrs)\n                        $pieToggle.appendTo(this.el)\n                        this.$pieToggles[opt.name] = $pieToggle\n                    }, this)\n\n                    break\n\n                default:\n                    throw new Error('ui.Halo: unknown type')\n            }\n\n            this.update()\n            this.$el.addClass('animate').appendTo(options.paper.el)\n            this.setPieIcons()\n\n            return this\n        },\n\n        // For pie halos we must set the \"xlink:href\" attribute of the <image> SVG element.\n        // Because we cannot set it via CSS.\n        setPieIcons: function() {\n\n            if (this.options.type !== 'pie') return\n\n            this.$el.find('.handle').each(function(index, handleEl) {\n\n                let $sliceIcon\n                const $handle = $(handleEl)\n                const name = $handle.attr('data-action')\n                const handle = this.getHandle(name)\n\n                // Don't override the image icon.\n                if (handle && handle.icon) return\n\n                const content = window.getComputedStyle(handleEl, ':before').getPropertyValue('content')\n\n                if (content && content !== 'none') {\n\n                    $sliceIcon = $handle.find('.slice-text-icon')\n                    if ($sliceIcon.length > 0) {\n                        V($sliceIcon[0]).text(content.replace(/['\"]/g, ''))\n                    }\n                }\n\n                const bgImage = $handle.css('background-image')\n\n                if (bgImage) {\n\n                    const match = bgImage.match(/url\\(['\"]?([^'\"]+)['\"]?\\)/)\n\n                    if (match) {\n\n                        const imageUrl = match[1]\n                        $sliceIcon = $handle.find('.slice-img-icon')\n\n                        if ($sliceIcon.length > 0) {\n                            V($sliceIcon[0]).attr('xlink:href', imageUrl)\n                        }\n                    }\n                }\n\n            }.bind(this))\n        },\n\n        /**\n         * @protected\n         */\n        update: function() {\n\n            if (!this.isRendered()) {\n                return\n            }\n\n            this.updateBoxContent()\n\n            const bbox = this.getBBox()\n\n            this.$el.toggleClass('tiny', bbox.width < this.options.tinyThreshold && bbox.height < this.options.tinyThreshold)\n            this.$el.toggleClass('small', !this.$el.hasClass('tiny') && (bbox.width < this.options.smallThreshold && bbox.height < this.options.smallThreshold))\n\n            this.$el.css({\n                width: bbox.width,\n                height: bbox.height,\n                left: bbox.x,\n                top: bbox.y\n            })\n\n            if (this.hasHandle('unlink')) {\n                this.toggleUnlink()\n            }\n        },\n\n        /**\n         * @private\n         * @returns {g.rect}\n         */\n        getBBox: function() {\n\n            const {cellView} = this.options\n            const {bbox} = this.options\n            let rect = (joint.util.isFunction(bbox)) ? bbox(cellView, this) : bbox\n\n            rect = joint.util.defaults({}, rect, { x: 0, y: 0, width: 1, height: 1 })\n\n            return g.rect(rect)\n        },\n\n        /**\n         * @private\n         * Add halo type for css styling purposes.\n         * @returns {string}\n         */\n        cellTypeCssClass: function() {\n            return this.options.typeCssName\n        },\n\n        /**\n         * Updates the box content.\n         * @private\n         */\n        updateBoxContent: function() {\n\n            const {boxContent} = this.options\n            const {cellView} = this.options\n\n            if (joint.util.isFunction(boxContent)) {\n\n                const content = boxContent.call(this, cellView, this.$box[0])\n\n                // don't append empty content. (the content might had been created inside boxContent()\n                if (content) {\n                    this.$box.html(content)\n                }\n\n            } else if (boxContent) {\n\n                this.$box.html(boxContent)\n\n            } else {\n\n                this.$box.remove()\n            }\n        },\n\n        /**\n         * @public\n         * @param {Object} handleTooltips\n         */\n        extendHandles: function(handleTooltips) {\n\n            joint.util.forIn(handleTooltips, function(item) {\n\n                const handle = this.getHandle(item.name)\n                if (handle) {\n                    joint.util.assign(handle, item)\n                }\n            }.bind(this))\n        },\n\n        /**\n         * Add multiple handles in one go. This is just a syntactic sugar\n         * to looping over `handles` and calling `addHandle()`.\n         * @public\n         * @param {Array.<Object>}handles\n         * @returns {joint.ui.Halo}\n         */\n        addHandles: function(handles) {\n\n            joint.util.toArray(handles).forEach(this.addHandle, this)\n            return this\n        },\n\n        /**\n         * @public\n         * @param {Object} opt\n         * @returns {joint.ui.Halo}\n         */\n        addHandle: function(opt) {\n\n            const handle = this.getHandle(opt.name)\n\n            /// Add new handle only if this does not exist yet.\n            if (!handle) {\n\n                this.handles.push(opt)\n\n                joint.util.forIn(opt.events, function(method, event) {\n\n                    if (joint.util.isString(method)) {\n\n                        this.on(`action:${  opt.name  }:${  event}`, this[method], this)\n\n                    } else {\n\n                        // Otherwise, it must be a function.\n                        this.on(`action:${  opt.name  }:${  event}`, method)\n                    }\n\n                }.bind(this))\n\n                if (this.$handles) {\n                    // Render the new handle only if the entire halo has been rendered.\n                    // Otherwise `render()` takes care about it.\n                    this.renderHandle(opt).appendTo(this.$handles)\n                }\n            }\n\n            return this\n        },\n\n        /**\n         * @private\n         * @param {Object} opt\n         * @returns {jQuery}\n         */\n        renderHandle: function(opt) {\n\n            // basic handle element\n            const handleIdx = this.getHandleIdx(opt.name)\n            const $handle = $('<div/>')\n                .addClass('handle')\n                .addClass(opt.name)\n                .attr('data-action', opt.name)\n                .prop('draggable', false)\n\n            switch (this.options.type) {\n\n                case 'toolbar':\n                case 'surrounding':\n\n                    // add direction to the handle, so the handle\n                    // can be positioned via css\n                    $handle.addClass(opt.position)\n\n                    if (opt.content) {\n                        $handle.html(opt.content)\n                    }\n\n                    break\n\n                case 'pie':\n\n                    var outerRadius = this.PIE_OUTER_RADIUS\n                    var innerRadius = this.PIE_INNER_RADIUS\n                    var iconRadius = (outerRadius + innerRadius) / 2\n                    var center = g.point(outerRadius, outerRadius)\n                    var sliceRadian = g.toRad(this.options.pieSliceAngle)\n                    var startRadian = handleIdx * sliceRadian + g.toRad(this.options.pieStartAngleOffset)\n                    var stopRadian = startRadian + sliceRadian\n                    var slicePathData = V.createSlicePathData(innerRadius, outerRadius, startRadian, stopRadian)\n\n                    // Create SVG elements for the slice.\n                    var svgRoot = V('svg').addClass('slice-svg')\n                    // Note that css transformation on svg elements do not work in IE.\n                    var svgSlice = V('path').attr('d', slicePathData).translate(outerRadius, outerRadius).addClass('slice')\n\n                    // Position the icon in the center of the slice.\n                    var iconPosition = g.point.fromPolar(iconRadius, -startRadian - sliceRadian / 2, center)\n                    var iconSize = this.options.pieIconSize\n                    var svgIcon = V('image').attr(iconPosition).addClass('slice-img-icon')\n                    iconPosition.y = iconPosition.y + iconSize - 2\n                    var svgTextIcon = V('text', { 'font-size': iconSize }).attr(iconPosition).addClass('slice-text-icon')\n\n                    // Setting the size of an SVG image via css is possible only in chrome.\n                    svgIcon.attr({\n                        width: iconSize,\n                        height: iconSize\n                    })\n\n                    // Setting a `transform` css rule on an element with a value as\n                    // a percentage is not possible in firefox.\n                    svgIcon.translate(-iconSize / 2, -iconSize / 2)\n                    svgTextIcon.translate(-iconSize / 2, -iconSize / 2)\n\n                    svgRoot.append([svgSlice, svgIcon, svgTextIcon])\n                    $handle.append(svgRoot.node)\n                    break\n            }\n\n            if (opt.icon) {\n                this.setHandleIcon($handle, opt.icon)\n            }\n\n            // `opt.attrs` allows for setting arbitrary attributes on the generated HTML.\n            // This object is of the form: `<selector> : { <attributeName> : <attributeValue>, ... }`\n            joint.util.setAttributesBySelector($handle, opt.attrs)\n\n            return $handle\n        },\n\n        /**\n         * @private\n         */\n        setHandleIcon: function($handle, icon) {\n\n            switch (this.options.type) {\n\n                case 'pie':\n                    var $icon = $handle.find('.slice-img-icon')\n                    V($icon[0]).attr('xlink:href', icon)\n                    break\n\n                case 'toolbar':\n                case 'surrounding':\n                    $handle.css('background-image', `url(${  icon  })`)\n                    break\n            }\n        },\n\n        /**\n         * Remove all the handles from the Halo.\n         * @public\n         * @returns {joint.ui.Halo}\n         */\n        removeHandles: function() {\n\n            // Note that we cannot use `_.each()` here because `removeHandle()`\n            // changes the length of the `handles` array.\n            while (this.handles.length) {\n                this.removeHandle(this.handles[0].name)\n            }\n\n            return this\n        },\n\n        /**\n         * @public\n         * @param {string} name\n         * @returns {joint.ui.Halo}\n         */\n        removeHandle: function(name) {\n\n            const handleIdx = this.getHandleIdx(name)\n            const handle = this.handles[handleIdx]\n            if (handle) {\n\n                joint.util.forIn(handle.events, function(method, event) {\n\n                    this.off(`action:${  name  }:${  event}`)\n\n                }.bind(this))\n\n                this.$(`.handle.${  name}`).remove()\n\n                this.handles.splice(handleIdx, 1)\n            }\n\n            return this\n        },\n\n        /**\n         * @public\n         * @param {string} name\n         * @param {Object} opt\n         * @returns {joint.ui.Halo}\n         */\n        changeHandle: function(name, opt) {\n\n            const handle = this.getHandle(name)\n            if (handle) {\n\n                this.removeHandle(name)\n                this.addHandle(joint.util.merge({ name: name }, handle, opt))\n            }\n\n            return this\n        },\n\n        /**\n         * @public\n         * @param {string} name\n         * @returns {boolean}\n         */\n        hasHandle: function(name) {\n\n            return this.getHandleIdx(name) !== -1\n        },\n\n        /**\n         * @public\n         * @param {string} name\n         * @returns {string}\n         */\n        getHandleIdx: function(name) {\n\n            return joint.util.toArray(this.handles).findIndex(function(item) {\n                return item.name === name\n            })\n        },\n\n        /**\n         * @public\n         * @param {string} name\n         * @returns {Object}\n         */\n        getHandle: function(name) {\n\n            return joint.util.toArray(this.handles).find(function(item) {\n                return item.name === name\n            })\n        },\n\n        /**\n         * Handle selection\n         * ----------------\n         * Adds 'selected' class on certain handle.\n         * Replace the icon based on the selected state.\n         * change the selected state of a handle.\n         * selected / unselected\n         * @public\n         * @param {string} name\n         * @param {boolean} selected\n         * @returns {joint.ui.Halo}\n         */\n        toggleHandle: function(name, selected) {\n\n            const handle = this.getHandle(name)\n\n            if (handle) {\n\n                const $handle = this.$(`.handle.${  name}`)\n\n                if (selected === undefined) {\n                    // If no selected state is requested\n                    // change the current state to the opposite one.\n                    selected = !$handle.hasClass('selected')\n                }\n\n                $handle.toggleClass('selected', selected)\n\n                const icon = selected ? handle.iconSelected : handle.icon\n\n                if (icon) {\n                    this.setHandleIcon($handle, icon)\n                }\n            }\n\n            return this\n        },\n\n        /**\n         * a helper to select handle\n         * @public\n         * @param {string} name\n         */\n        selectHandle: function(name) {\n\n            return this.toggleHandle(name, true)\n        },\n\n        /**\n         * a helper to unselect handle\n         * @public\n         * @param {string} name\n         */\n        deselectHandle: function(name) {\n\n            return this.toggleHandle(name, false)\n        },\n\n        /**\n         * a helper to deselect all selected handles\n         * @public\n         */\n        deselectAllHandles: function() {\n\n            joint.util.toArray(this.handles).forEach(function(handle) {\n                this.deselectHandle(handle.name)\n            }, this)\n\n            return this\n        },\n\n        /**\n         * @private\n         */\n        onHandlePointerDown: function(evt) {\n\n            const action = this._action = $(evt.target).closest('.handle').attr('data-action')\n            if (action) {\n\n                evt.preventDefault()\n                evt.stopPropagation()\n                evt = joint.util.normalizeEvent(evt)\n\n                const clientCoords = this.options.paper.snapToGrid({ x: evt.clientX, y: evt.clientY })\n                const {x} = clientCoords\n                const {y} = clientCoords\n                this._localX = x\n                this._localY = y\n                this._evt = evt\n\n                if (evt.type === 'mousedown' && evt.button === 2) {\n                    this.triggerAction(action, 'contextmenu', evt, x, y)\n                } else {\n                    this.triggerAction(action, 'pointerdown', evt, x, y)\n                    this.delegateDocumentEvents(null, evt.data)\n                }\n            }\n        },\n\n        /**\n         * @private\n         */\n        onPieTogglePointerDown: function(evt) {\n\n            evt.stopPropagation()\n            const $pieToggle = $(evt.target).closest('.pie-toggle')\n            const toggleName = $pieToggle.attr('data-name')\n            if (this.isOpen(toggleName)) {\n                // The pie menu was opened with the same toggle button, toggle the state\n                // for the same button which effectively closes the pie menu.\n                this.toggleState(toggleName)\n            } else if (this.isOpen()) {\n                // If the pie menu was open by a different toggle button, close it first,\n                // then open it for a different toggle button.\n                this.toggleState()\n                this.toggleState(toggleName)\n            } else {\n                // Otherwise, just open the pie menu for with that toggle button.\n                this.toggleState(toggleName)\n            }\n        },\n\n        /**\n         * Trigger an action on the Halo object.\n         * @private\n         * @param {string} action\n         * @param {string} eventName Abstracted JointJS event name (pointerdown, pointermove, pointerup\n         * @param {object} evt DOM event\n         */\n        triggerAction: function(action, eventName, evt) {\n\n            const args = Array.prototype.slice.call(arguments, 2)\n            args.unshift(`action:${  action  }:${  eventName}`)\n            this.trigger.apply(this, args)\n        },\n\n        /**\n         * @private\n         */\n        stopBatch: function() {\n            this.options.graph.stopBatch('halo', { halo: this.cid })\n        },\n\n        /**\n         * @private\n         */\n        startBatch: function() {\n            this.options.graph.startBatch('halo', { halo: this.cid })\n        },\n\n        /**\n         * @private\n         */\n        pointermove: function(evt) {\n\n            if (!this._action) return\n\n            evt.preventDefault()\n            evt.stopPropagation()\n            evt = joint.util.normalizeEvent(evt)\n\n            const clientCoords = this.options.paper.snapToGrid({ x: evt.clientX, y: evt.clientY })\n            const dx = clientCoords.x - this._localX\n            const dy = clientCoords.y - this._localY\n            this._localX = clientCoords.x\n            this._localY = clientCoords.y\n            this._evt = evt\n\n            this.triggerAction(this._action, 'pointermove', evt, clientCoords.x, clientCoords.y, dx, dy)\n        },\n\n        /**\n         * @private\n         */\n        pointerup: function(evt) {\n\n            const action = this._action\n            if (!action) return\n\n            this._action = null\n            this._evt = null\n\n            const clientCoords = this.options.paper.snapToGrid({ x: evt.clientX, y: evt.clientY })\n            this.triggerAction(action, 'pointerup', evt, clientCoords.x, clientCoords.y)\n            this.undelegateDocumentEvents()\n        },\n\n        /**\n         * @private\n         */\n        onRemove: function() {\n\n            if (this._action && this._evt) {\n                // Finish the action if there an ongoing one exists.\n                this.pointerup(this._evt)\n            }\n\n            if (this.options.graph.hasActiveBatch('halo')) {\n                this.stopBatch()\n            }\n        },\n\n        onSetTheme: function() {\n\n            this.setPieIcons()\n        },\n\n        /**\n         * @private\n         */\n        removeElement: function() {\n\n            this.options.cellView.model.remove()\n        },\n\n        /**\n         * @private\n         */\n        toggleUnlink: function() {\n\n            const canUnlink = this.options.graph.getConnectedLinks(this.options.cellView.model).length > 0\n\n            this.$handles.children('.unlink').toggleClass('hidden', !canUnlink)\n        },\n\n        /**\n         * @private\n         */\n        toggleFork: function() {\n\n            // temporary create a clone model and its view\n            let clone = this.options.cellView.model.clone()\n            const cloneView = this.options.paper.createViewForModel(clone)\n\n            // if a connection after forking would not be valid, hide the fork icon\n            const canFork = this.options.paper.options.validateConnection(this.options.cellView, null, cloneView, null, 'target')\n\n            this.$handles.children('.fork').toggleClass('hidden', !canFork)\n\n            cloneView.remove()\n            clone = null\n        },\n\n        /**\n         * Toggles open/closed state of the halo.\n         * `toggleName` is the name of the pie toggle button as defined in `options.pieToggles`.\n         * @public\n         * @param {string} toggleName\n         */\n        toggleState: function(toggleName) {\n\n            if (!this.isRendered()) {\n                return\n            }\n\n            const {$el} = this\n\n            joint.util.forIn(this.$pieToggles, function($pieToggle) {\n                $pieToggle.removeClass('open')\n            })\n\n            if (this.isOpen()) {\n                this.trigger('state:close', toggleName)\n                $el.removeClass('open')\n\n            } else {\n                // Note that we trigger the `state:open` event BEFORE we add\n                // the `'open'` class name to the halo. The reason\n                // is to give the programmer a chance to add/remove/change handles\n                // in the handler for the state:open event before the handles\n                // are actually made visible in the DOM.\n                this.trigger('state:open', toggleName)\n                if (toggleName) {\n\n                    const pieToggle = joint.util.toArray(this.options.pieToggles).find(function(toggle) {\n                        return toggle.name === toggleName\n                    })\n                    if (pieToggle) {\n                        // Add the pie toggle position\n                        // to the halo container so that we can position the handles\n                        // based on the position of the toggle that opened it.\n                        // Add also the pie toggle name so that handles can be styled\n                        // differently based on the pie toggle that was used to open them.\n                        $el.attr({\n                            'data-pie-toggle-position': pieToggle.position,\n                            'data-pie-toggle-name': pieToggle.name\n                        })\n                    }\n                    this.$pieToggles[toggleName].addClass('open')\n                }\n                $el.addClass('open')\n            }\n        },\n\n        /**\n         * Return true if the Halo is open. This makes sense (similar to toggleState())\n         * only for the 'pie' type of Halo.\n         * If `toggleName` is passed, return true only if the halo was opened by that specific toggle button.\n         * @public\n         * @param {string} toggleName\n         * @returns {boolean}\n         */\n        isOpen: function(toggleName) {\n\n            if (!this.isRendered()) {\n                return false\n            }\n\n            return toggleName ? this.$pieToggles[toggleName].hasClass('open') : this.$el.hasClass('open')\n        },\n\n        /**\n         * @public\n         * @returns {boolean}\n         */\n        isRendered: function() {\n            return this.$box !== undefined\n        }\n\n    }, {\n\n        // removes a halo from a paper\n        clear: function(paper) {\n\n            paper.trigger('halo:create')\n        }\n    })\n}(joint));\n\n\n(function(joint) {\n\n    /**\n     * @typedef {{items: Array.<Object>, group: Object}} GroupedItems\n     */\n    joint.ui.Toolbar = joint.mvc.View.extend({\n\n        options: {\n            /*\n             tools: [\n                {group: 'groupName'}\n             ],\n             groups: {\n                'name': {\n                    index: number,\n                    align: 'left' | 'right'\n                }\n\n             }\n             references: {}\n             */\n        },\n        align: ['left', 'right'],\n        className: 'toolbar',\n        defaultGroup: 'default',\n        widgets: [],\n        groupViews: [],\n\n        init: function() {\n\n            this.tools = joint.util.toArray(this.options.tools)\n            this.groups = this.options.groups || {}\n        },\n\n        /**\n         * @public\n         * @param {string} name\n         * @returns {Array.<joint.ui.Widget>}\n         */\n        getWidgetByName: function(name) {\n\n            return this.widgets.find(function(item) {\n                return item.options.name === name\n            })\n        },\n\n        /**\n         * @public\n         * @returns {Array.<joint.ui.Widget>}\n         */\n        getWidgets: function() {\n\n            return this.widgets\n        },\n\n        /**\n         * @private\n         * @typedef {{items: Array.<Object>, group: Object}} GroupedItems\n         * @returns {Array.<[string, GroupedItems]>}\n         */\n        groupsWithItemsPairs: function() {\n\n            const groupedItems = {}\n\n            this.tools.forEach(function(item) {\n\n                const group = item.group || this.defaultGroup\n                groupedItems[group] = groupedItems[group] || { items: [], group: {}}\n                groupedItems[group].items.push(item)\n                groupedItems[group].group = this.groups[group] || {}\n\n            }, this)\n\n            const keys = Object.keys(groupedItems)\n\n            const pairs = []\n            for (let i = 0, n = keys.length; i < n; i++) {\n                const key = keys[i]\n                pairs.push([key, groupedItems[key]])\n            }\n\n            const byIndex = joint.util.sortBy(pairs, function(pair) {\n                return pair[1].group.index\n            })\n\n            return joint.util.sortBy(byIndex, function(pair) {\n                return pair[1].group.align || 'left'\n            })\n        },\n\n        /**\n         * @public\n         * @returns {joint.ui.Toolbar}\n         */\n        render: function() {\n\n            const sortedGroups = this.groupsWithItemsPairs()\n            let firstAlignRight = false\n\n            sortedGroups.forEach(function(groupArray) {\n\n                const name = groupArray[0]\n                const grouped = groupArray[1]\n                const $group = this.renderGroup(name, grouped)\n\n                if (!firstAlignRight && grouped.group.align && grouped.group.align === 'right') {\n                    firstAlignRight = true\n                    $group.addClass('group-first')\n                }\n\n                $group.appendTo(this.el)\n\n            }, this)\n\n            return this\n        },\n\n        /**\n         * @private\n         * @param {string} name\n         * @param {GroupedItems} grouped\n         * @returns {jQuery}\n         */\n        renderGroup: function(name, grouped) {\n\n            const groupView = new ToolbarGroupView({\n                name: name,\n                align: grouped.group.align,\n                items: grouped.items,\n                references: this.options.references\n            })\n\n            this.groupViews.push(groupView)\n\n            groupView.on('all', function() {\n                this.trigger.apply(this, arguments)\n            }.bind(this))\n\n            groupView.render()\n\n            this.widgets = this.widgets.concat(groupView.widgets)\n\n            return groupView.$el\n        },\n\n        onRemove: function() {\n\n            joint.util.invoke(this.groupViews, 'off')\n            joint.util.invoke(this.groupViews, 'remove')\n        }\n    })\n\n    var ToolbarGroupView = joint.mvc.View.extend({\n\n        className: 'toolbar-group',\n\n        init: function() {\n\n            this.widgets = []\n        },\n\n        onRender: function() {\n\n            this.$el.attr('data-group', this.options.name)\n            this.$el.addClass(this.options.align)\n            this.renderItems()\n        },\n\n        renderItems: function() {\n\n            joint.util.toArray(this.options.items).forEach(function(item) {\n                const widget = this.createWidget(item)\n                this.$el.append(widget.$el)\n            }, this)\n        },\n\n        createWidget: function(item) {\n\n            const widget = joint.ui.Widget.create(item, this.options.references)\n            widget.on('all', function(eventName) {\n                const data = Array.prototype.slice.call(arguments, 1)\n                this.trigger.apply(this, [`${item.name  }:${  eventName}`].concat(data))\n            }.bind(this))\n            this.widgets.push(widget)\n            return widget\n        },\n\n        onRemove: function() {\n\n            joint.util.invoke(this.widgets, 'off')\n            joint.util.invoke(this.widgets, 'remove')\n        }\n    })\n\n}(joint));\n\n(function(joint, $) {\n\n    joint.ui.Widget = joint.mvc.View.extend({\n\n        className: 'widget',\n        /** @type {Array.<string>} List of mandatory references, widget cannot be created if any of the reference from list\n         * is not defined in options */\n        references: [],\n\n        constructor: function(options, refs) {\n\n            this.availableReferences = refs || {}\n            joint.mvc.View.prototype.constructor.call(this, options)\n        },\n        /**\n         * @private\n         * Apply attributes data onto widget elements.\n         * @param {Object.<string, Object>} attrs\n         * @returns {jQuery}\n         */\n        updateAttrs: function(attrs) {\n\n            joint.util.setAttributesBySelector(this.$el, attrs)\n        },\n\n        /**\n         * @protected\n         * Override in specific widget.\n         */\n        bindEvents: function() {\n\n        },\n\n        /**\n         * @private\n         */\n        validateReferences: function() {\n            const refs = this.references || []\n            const ret = []\n\n            refs.forEach(function(ref) {\n\n                if (this.availableReferences[ref] === undefined) {\n                    ret.push(ref)\n                }\n\n            }, this)\n\n            return ret\n        },\n\n        /**\n         * @protected\n         * @param {string} name\n         * @returns {*}\n         */\n        getReference: function(name) {\n            return this.availableReferences[name]\n        },\n\n        /**\n         * @protected\n         * @returns {Array.<*>}\n         */\n        getReferences: function() {\n            return this.availableReferences\n        }\n\n    }, {\n        /**\n         * @param {Object} opt\n         * @param {Object?} refs references\n         * @returns {joint.ui.Widget}\n         */\n        create: function(opt, refs) {\n\n            const type = joint.util.camelCase(joint.util.isString(opt) ? opt : opt.type)\n\n            if (!joint.util.isFunction(joint.ui.widgets[type])) {\n                throw new Error(`Widget: unable to find widget: \"${  type  }\"`)\n            }\n\n            const widget = new joint.ui.widgets[type](opt, refs)\n\n            const invalidRefs = widget.validateReferences(refs)\n            if (invalidRefs.length > 0) {\n                throw new Error(`Widget: \"${  type  }\" missing dependency: ${  invalidRefs.join(', ')}`)\n            }\n\n            widget.render()\n            widget.updateAttrs(opt.attrs)\n            widget.bindEvents()\n            widget.$el.attr('data-type', type)\n\n            if (opt.name) {\n                widget.$el.attr('data-name', opt.name)\n            }\n\n            return widget\n        }\n    })\n\n    joint.ui.widgets = {\n\n        checkbox: joint.ui.Widget.extend({\n\n            tagName: 'label',\n            events: {\n                'change .input': 'onChange',\n                mousedown: 'pointerdown',\n                touchstart: 'pointerdown',\n                mouseup: 'pointerup',\n                touchend: 'pointerup'\n            },\n\n            init: function() {\n                joint.util.bindAll(this, 'pointerup')\n            },\n\n            render: function() {\n\n                const opt = this.options\n\n                const $label = $('<span/>').text(opt.label || '')\n                this.$input = $('<input/>', { type: 'checkbox', class: 'input' }).prop('checked', !!opt.value)\n                this.$span = $('<span/>')\n\n                this.$el.append([$label, this.$input, this.$span])\n\n                return this\n            },\n\n            onChange: function(evt) {\n                this.trigger('change', !!evt.target.checked, evt)\n            },\n\n            pointerdown: function(evt) {\n                evt = joint.util.normalizeEvent(evt)\n                this.$el.addClass('is-in-action')\n                this.trigger('pointerdown', evt)\n                $(document).on('mouseup.checkbox touchend.checkbox', this.pointerup)\n            },\n\n            pointerup: function(evt) {\n                evt = joint.util.normalizeEvent(evt)\n                $(document).off('mouseup.checkbox touchend.checkbox')\n                this.trigger('pointerdown', evt)\n                this.$el.removeClass('is-in-action')\n            }\n        }),\n\n        toggle: joint.ui.Widget.extend({\n\n            tagName: 'label',\n            events: {\n                'change input.toggle': 'onChange',\n                mousedown: 'pointerdown',\n                touchstart: 'pointerdown',\n                mouseup: 'pointerup',\n                touchend: 'pointerup'\n            },\n\n            init: function() {\n                joint.util.bindAll(this, 'pointerup')\n            },\n\n            render: function() {\n\n                const opt = this.options\n\n                const $label = $('<span/>').text(opt.label || '')\n                const $button = $('<span><i/></span>')\n                const $input = $('<input/>', { type: 'checkbox', class: 'toggle' }).prop('checked', !!opt.value)\n                const $wrapper = $('<div/>').addClass(opt.type)\n\n                this.$el.append([$label, $wrapper.append($input, $button)])\n\n                return this\n            },\n\n            onChange: function(evt) {\n                this.trigger('change', !!evt.target.checked, evt)\n            },\n\n            pointerdown: function(evt) {\n                evt = joint.util.normalizeEvent(evt)\n                this.$el.addClass('is-in-action')\n                this.trigger('pointerdown', evt)\n                $(document).on('mouseup.toggle touchend.toggle', this.pointerup)\n            },\n\n            pointerup: function(evt) {\n                evt = joint.util.normalizeEvent(evt)\n                $(document).off('mouseup.toggle touchend.toggle')\n                this.$el.removeClass('is-in-action')\n                this.trigger('pointerup', evt)\n            }\n        }),\n\n        separator: joint.ui.Widget.extend({\n\n            render: function() {\n\n                if (this.options.width) {\n                    this.$el.css({ width: this.options.width })\n                }\n\n                return this\n            }\n        }),\n\n        label: joint.ui.Widget.extend({\n\n            tagName: 'label',\n\n            render: function() {\n\n                this.$el.text(this.options.text)\n\n                return this\n            }\n        }),\n\n        range: joint.ui.Widget.extend({\n\n            events: {\n                'change .input': 'onChange',\n                'input .input': 'onChange'\n            },\n\n            render: function() {\n\n                const opt = this.options\n                let $units\n\n                this.$output = $('<output/>').text(opt.value)\n                $units = $('<span/>').addClass('units').text(opt.unit)\n                this.$input = $('<input/>', {\n                    type: 'range',\n                    name: opt.type,\n                    min: opt.min,\n                    max: opt.max,\n                    step: opt.step,\n                    class: 'input'\n                }).val(opt.value)\n\n                this.$el.append([this.$input, this.$output, $units])\n\n                return this\n            },\n\n            onChange: function(evt) {\n\n                const value = parseInt(this.$input.val(), 10)\n                if (value === this.currentValue) {\n                    return \n                }\n\n                this.currentValue = value\n                this.$output.text(value)\n                this.trigger('change', value, evt)\n            },\n\n            setValue: function(value) {\n                this.$input.val(value)\n                this.$input.trigger('change')\n            }\n        }),\n\n        selectBox: joint.ui.Widget.extend({\n\n            render: function() {\n\n                const selectBoxOptions = joint.util.omit(this.options, 'type', 'group', 'index')\n\n                this.selectBox = new joint.ui.SelectBox(selectBoxOptions)\n                this.selectBox.render().$el.appendTo(this.el)\n\n                return this\n            },\n\n            bindEvents: function() {\n                this.selectBox.on('all', this.trigger, this)\n            }\n        }),\n\n        button: joint.ui.Widget.extend({\n\n            events: {\n                mousedown: 'pointerdown',\n                touchstart: 'pointerdown',\n                click: 'pointerclick',\n                touchend: 'pointerclick'\n            },\n            tagName: 'button',\n\n            render: function() {\n\n                const opt = this.options\n\n                this.$el.text(opt.text)\n\n                return this\n            },\n\n            pointerclick: function(evt) {\n                evt = joint.util.normalizeEvent(evt)\n                this.trigger('pointerclick', evt)\n            },\n\n            pointerdown: function(evt) {\n                evt = joint.util.normalizeEvent(evt)\n                this.trigger('pointerdown', evt)\n            }\n        }),\n\n        inputText: joint.ui.Widget.extend({\n\n            events: {\n                mousedown: 'pointerdown',\n                touchstart: 'pointerdown',\n                mouseup: 'pointerup',\n                touchend: 'pointerup',\n                click: 'pointerclick',\n                focusin: 'pointerfocusin',\n                focusout: 'pointerfocusout'\n            },\n            tagName: 'div',\n\n            render: function() {\n\n                const opt = this.options\n\n                this.$label = $('<label/>').text(opt.label)\n                this.$input = $('<div/>').addClass('input-wrapper').append( $('<input/>', {\n                    type: 'text',\n                    class: 'input'\n                }).val(opt.value) )\n\n                this.$el.append([this.$label, this.$input])\n\n                return this\n            },\n\n            pointerclick: function(evt) {\n                evt = joint.util.normalizeEvent(evt)\n                this.trigger('pointerclick', evt)\n            },\n\n            pointerdown: function(evt) {\n                evt = joint.util.normalizeEvent(evt)\n                this.trigger('pointerdown', evt)\n            },\n\n            pointerup: function(evt) {\n                evt = joint.util.normalizeEvent(evt)\n                this.trigger('pointerup', evt)\n            },\n\n            pointerfocusin: function(evt) {\n                evt = joint.util.normalizeEvent(evt)\n                this.$el.addClass('is-focused')\n                this.trigger('pointerfocusin', evt)\n            },\n\n            pointerfocusout: function(evt) {\n                evt = joint.util.normalizeEvent(evt)\n                this.$el.removeClass('is-focused')\n                this.trigger('pointerfocusout', evt)\n            }\n        }),\n\n        inputNumber: joint.ui.Widget.extend({\n\n            events: {\n                mousedown: 'pointerdown',\n                touchstart: 'pointerdown',\n                mouseup: 'pointerup',\n                touchend: 'pointerup',\n                click: 'pointerclick',\n                focusin: 'pointerfocusin',\n                focusout: 'pointerfocusout'\n            },\n            tagName: 'div',\n\n            render: function() {\n\n                const opt = this.options\n\n                this.$label = $('<label/>').text(opt.label)\n                this.$input = $('<div/>').addClass('input-wrapper').append( $('<input/>', {\n                    type: 'number',\n                    class: 'number',\n                    max: opt.max,\n                    min: opt.min\n                }).val(opt.value) )\n\n                this.$el.append([this.$label, this.$input])\n\n                return this\n            },\n\n            pointerclick: function(evt) {\n                evt = joint.util.normalizeEvent(evt)\n                this.trigger('pointerclick', evt)\n            },\n\n            pointerdown: function(evt) {\n                evt = joint.util.normalizeEvent(evt)\n                this.trigger('pointerdown', evt)\n            },\n\n            pointerup: function(evt) {\n                evt = joint.util.normalizeEvent(evt)\n                this.trigger('pointerup', evt)\n            },\n\n            pointerfocusin: function(evt) {\n                evt = joint.util.normalizeEvent(evt)\n                this.$el.addClass('is-focused')\n                this.trigger('pointerfocusin', evt)\n            },\n\n            pointerfocusout: function(evt) {\n                evt = joint.util.normalizeEvent(evt)\n                this.$el.removeClass('is-focused')\n                this.trigger('pointerfocusout', evt)\n            }\n        }),\n\n        textarea: joint.ui.Widget.extend({\n\n            events: {\n                mousedown: 'pointerdown',\n                touchstart: 'pointerdown',\n                mouseup: 'pointerup',\n                touchend: 'pointerup',\n                click: 'pointerclick',\n                focusin: 'pointerfocusin',\n                focusout: 'pointerfocusout'\n            },\n            tagName: 'div',\n\n            render: function() {\n\n                const opt = this.options\n\n                this.$label = $('<label/>').text(opt.label)\n                this.$input = $('<div/>').addClass('input-wrapper').append( $('<textarea/>', {\n                    class: 'textarea'\n                }).text(opt.value) )\n\n                this.$el.append([this.$label, this.$input])\n\n                return this\n            },\n\n            pointerclick: function(evt) {\n                evt = joint.util.normalizeEvent(evt)\n                this.trigger('pointerclick', evt)\n            },\n\n            pointerdown: function(evt) {\n                evt = joint.util.normalizeEvent(evt)\n                this.trigger('pointerdown', evt)\n            },\n\n            pointerup: function(evt) {\n                evt = joint.util.normalizeEvent(evt)\n                this.trigger('pointerup', evt)\n            },\n\n            pointerfocusin: function(evt) {\n                evt = joint.util.normalizeEvent(evt)\n                this.$el.addClass('is-focused')\n                this.trigger('pointerfocusin', evt)\n            },\n\n            pointerfocusout: function(evt) {\n                evt = joint.util.normalizeEvent(evt)\n                this.$el.removeClass('is-focused')\n                this.trigger('pointerfocusout', evt)\n            }\n        }),\n\n        selectButtonGroup: joint.ui.Widget.extend({\n\n            render: function() {\n\n                const selectButtonGroupOptions = joint.util.omit(this.options, 'type', 'group', 'index')\n\n                this.selectButtonGroup = new joint.ui.SelectButtonGroup(selectButtonGroupOptions)\n                this.selectButtonGroup.render().$el.appendTo(this.el)\n\n                return this\n            },\n\n            bindEvents: function() {\n                this.selectButtonGroup.on('all', this.trigger, this)\n            }\n        })\n    }\n\n    joint.ui.widgets.zoomIn = joint.ui.widgets.button.extend({\n\n        references: ['paperScroller'],\n        options: {\n            min: 0.2,\n            max: 5,\n            step: 0.2\n        },\n\n        pointerdown: function(evt) {\n\n            const opt = this.options\n\n            this.getReferences().paperScroller.zoom(opt.step, { max: opt.max, grid: opt.step })\n            joint.ui.widgets.button.prototype.pointerdown.call(this, evt)\n        }\n    })\n\n    joint.ui.widgets.zoomOut = joint.ui.widgets.button.extend({\n\n        references: ['paperScroller'],\n        options: {\n            min: 0.2,\n            max: 5,\n            step: 0.2\n        },\n\n        pointerdown: function(evt) {\n\n            const opt = this.options\n\n            this.getReferences().paperScroller.zoom(-opt.step, { min: opt.min, grid: opt.step })\n            joint.ui.widgets.button.prototype.pointerdown.call(this, evt)\n        }\n    })\n\n    joint.ui.widgets.zoomToFit = joint.ui.widgets.button.extend({\n\n        references: ['paperScroller'],\n        options: {\n            min: 0.2,\n            max: 5,\n            step: 0.2\n        },\n\n        pointerdown: function(evt) {\n\n            const opt = this.options\n\n            this.getReferences().paperScroller.zoomToFit({\n                padding: 20,\n                scaleGrid: opt.step,\n                minScale: opt.min,\n                maxScale: opt.max\n            })\n            joint.ui.widgets.button.prototype.pointerdown.call(this, evt)\n        }\n    })\n\n    joint.ui.widgets.zoomSlider = joint.ui.widgets.range.extend({\n\n        references: ['paperScroller'],\n        options: {\n            min: 20,\n            max: 500,\n            step: 20,\n            value: 100,\n            unit: ' %'\n        },\n\n        bindEvents: function() {\n\n            this.on('change', function(value) {\n                this.getReferences().paperScroller.zoom(value / 100, { absolute: true, grid: this.options.step / 100 })\n            }, this)\n\n            this.getReferences().paperScroller.options.paper.on('scale', function(value) {\n                this.setValue(Math.floor(value * 100))\n            }, this)\n        }\n    })\n\n    joint.ui.widgets.undo = joint.ui.widgets.button.extend({\n\n        references: ['commandManager'],\n\n        pointerclick: function() {\n            this.getReferences().commandManager.undo()\n        }\n    })\n\n    joint.ui.widgets.redo = joint.ui.widgets.button.extend({\n\n        references: ['commandManager'],\n\n        pointerclick: function() {\n            this.getReferences().commandManager.redo()\n        }\n    })\n\n    joint.ui.widgets.fullscreen = joint.ui.widgets.button.extend({\n\n        onRender: function() {\n            const target = this.target = $(this.options.target)[0]\n            if (target && !$.contains(window.top.document, target)) {\n                // The fullscreen feature is available only if the target is not displayed within an iframe.\n                this.$el.hide()\n            }\n        },\n\n        pointerclick: function() {\n            joint.util.toggleFullScreen(this.target)\n        }\n    })\n\n}(joint, $));\n\n// JointJS Stencil ui plugin.\n// --------------------------\n\n// USAGE:\n// var graph = new joint.dia.Graph;\n// var paper = new joint.dia.Paper({\n//    el: $('#paper'),\n//    width: 500,\n//    height: 300,\n//    gridSize: 20,\n//    perpendicularLinks: true,\n//    model: graph\n// });\n//\n// var stencil = new joint.ui.Stencil({ graph: graph, paper: paper });\n// $('#stencil-holder').append(stencil.render().el);\n\n\n(function(joint, util) {\n\n    const layoutDefaults = {\n\n        options: function() {\n            return {\n                columnWidth: this.options.width / 2 - 10,\n                columns: 2,\n                rowHeight: 80,\n                resizeToFit: true,\n                dy: 10,\n                dx: 10\n            }\n        },\n\n        /**\n         * @param {joint.dia.Graph} graph\n         * @param {Object} group Group\n         */\n        layoutGroup: function(graph, group) {\n\n            const opts = this.options.layout\n            group = group || {}\n\n            if (!joint.layout.GridLayout) {\n                throw new Error('joint.ui.Stencil: joint.layout.GridLayout is not available.')\n            }\n\n            joint.layout.GridLayout.layout(graph, util.assign({}, opts, group.layout))\n        }\n    }\n\n    joint.ui.Stencil = joint.mvc.View.extend({\n\n        className: 'stencil',\n\n        events: {\n            'click .btn-expand': 'openGroups',\n            'click .btn-collapse': 'closeGroups',\n            'click .groups-toggle > .group-label': 'openGroups',\n            'click .group > .group-label': 'onGroupLabelClick',\n            'touchstart .group > .group-label': 'onGroupLabelClick',\n            'input .search': 'onSearch',\n            'focusin .search': 'pointerFocusIn',\n            'focusout .search': 'pointerFocusOut'\n        },\n\n        documentEvents: {\n            mousemove: 'onDrag',\n            touchmove: 'onDrag',\n            mouseup: 'onDragEnd',\n            touchend: 'onDragEnd',\n            touchcancel: 'onDragEnd'\n        },\n\n        options: {\n            width: 200,\n            height: 800,\n            label: 'Stencil',\n            groups: null,\n            groupsToggleButtons: false,\n            dropAnimation: false,\n            search: null,\n            layout: null,\n            // An instance of Snapline plugin which should display\n            // snaplines while dragging an element from the stencil\n            snaplines: null,\n            // When set to `true` clone views are automatically\n            // scaled based on the current paper transformations.\n            // Note: this option is ignored when `snaplines` provided.\n            scaleClones: false,\n            /**\n             * @param {joint.dia.Cell} cell\n             * @returns {joint.dia.Cell}\n             */\n            dragStartClone: function(cell) {\n\n                return cell.clone()\n            },\n\n            /**\n             * @param {joint.dia.Cell} cell\n             * @returns {joint.dia.Cell}\n             */\n            dragEndClone: function(cell) {\n\n                return cell.clone()\n            },\n            /** @type {function|null} */\n            layoutGroup: null,\n            // The options passed into the stencil papers.\n            // e.g. { elementView: CustomElementView }\n            paperOptions: null\n        },\n\n        init: function() {\n\n            this.setPaper(this.options.paperScroller || this.options.paper)\n\n            /** @type {Object.<string, joint.dia.Graph>} */\n            this.graphs = {}\n            /** @type {Object.<string, joint.dia.Paper>} */\n            this.papers = {}\n            /** @type {Object.<string, jQuery>} */\n            this.$groups = {}\n\n            this.onSearch = util.debounce(this.onSearch, 200)\n            // re-delegate the debounced onSearch handler.\n            this.delegateEvents()\n\n            this.initializeLayout()\n        },\n\n        /**\n         * @private\n         */\n        initializeLayout: function() {\n\n            const {layout} = this.options\n\n            if (layout) {\n\n                if (util.isFunction(layout)) {\n                    this.layoutGroup = layout\n                } else {\n                    this.layoutGroup = layoutDefaults.layoutGroup.bind(this)\n                    this.options.layout = util.isObject(layout) ? layout : {}\n                    util.defaults(this.options.layout, layoutDefaults.options.call(this))\n                }\n            }\n        },\n\n        /**\n         * @public\n         * @param {joint.dia.Paper | joint.ui.PaperScroller} paper\n         */\n        setPaper: function(paper) {\n\n            const {options} = this\n\n            if (paper instanceof joint.dia.Paper) {\n\n                // Allow Stencil to be initialized with a paper only.\n                options.paperScroller = null\n                options.paper = paper\n                options.graph = paper.model\n\n            } else if (typeof joint.ui.PaperScroller === 'function' && paper instanceof joint.ui.PaperScroller) {\n\n                // Paper is a PaperScroller\n                options.paperScroller = paper\n                options.paper = paper.options.paper\n                options.graph = paper.options.paper.model\n\n            } else {\n\n                throw new Error('Stencil: paper required')\n            }\n        },\n\n        /**\n         * @private\n         * @returns {jQuery}\n         */\n        renderContent: function() {\n\n            return $('<div/>').addClass('content')\n        },\n\n        /**\n         * @private\n         * @returns {jQuery}\n         */\n        renderPaperDrag: function() {\n\n            return $('<div/>').addClass('stencil-paper-drag')\n        },\n\n        /**\n         * @private\n         * @returns {jQuery}\n         */\n        renderSearch: function() {\n\n            return $('<div/>').addClass('search-wrap').append($('<input/>', { type: 'search', placeholder: 'search' }).addClass('search'))\n        },\n\n        /**\n         * @private\n         * @returns {Array.<jQuery>}\n         */\n        renderToggleAll: function() {\n\n            return [\n                $('<div/>').addClass('groups-toggle')\n                    .append($('<label/>').addClass('group-label').html(this.options.label))\n                    .append($('<button/>', { text: '+' }).addClass('btn btn-expand'))\n                    .append($('<button/>', { text: '-' }).addClass('btn btn-collapse'))\n            ]\n        },\n\n        /**\n         * @private\n         * @returns {jQuery}\n         */\n        renderElementsContainer: function() {\n\n            return $('<div/>').addClass('elements')\n        },\n\n        /**\n         * @private\n         * @param {Object} opt\n         * @returns {jQuery}\n         */\n        renderGroup: function(opt) {\n\n            opt = opt || {}\n\n            const $group = $('<div/>')\n                .addClass('group')\n                .attr('data-name', opt.name)\n                .toggleClass('closed', !!opt.closed)\n\n            const $label = $('<h3/>')\n                .addClass('group-label')\n                .html(opt.label || opt.name)\n\n            const $elements = this.renderElementsContainer()\n\n            return $group.append($label, $elements)\n        },\n\n        /**\n         * @public\n         * @returns {joint.ui.Stencil}\n         */\n        render: function() {\n\n            const {options} = this\n\n            this.$content = this.renderContent()\n            this.$paperDrag = this.renderPaperDrag()\n\n            this.$el.empty().append(this.$paperDrag, this.$content)\n\n            if (options.search) {\n                this.$el.addClass('searchable').prepend(this.renderSearch())\n            }\n\n            if (options.groupsToggleButtons) {\n                this.$el.addClass('collapsible').prepend(this.renderToggleAll())\n            }\n\n            const paperOptions = util.defaults({\n                interactive: false,\n                preventDefaultBlankAction: false\n            }, options.paperOptions)\n\n            const groups = Object.keys(options.groups || {})\n\n            if (groups.length > 0) {\n\n                // Render as many papers as there are groups.\n                const sortedGroups = util.sortBy(groups, function(key) {\n                    return this[key].index\n                }.bind(options.groups))\n\n                sortedGroups.forEach(function(name) {\n\n                    const group = this.options.groups[name]\n\n                    const $group = this.$groups[name] = this.renderGroup({\n                        name: name,\n                        label: group.label,\n                        closed: group.closed\n                    }).appendTo(this.$content)\n\n                    const groupGraph = new joint.dia.Graph\n                    const groupPaperOption = util.assign({}, paperOptions, group.paperOptions, {\n                        el: $group.find('.elements'),\n                        model: groupGraph,\n                        width: group.width || options.width,\n                        height: group.height || options.height\n                    })\n                    const groupPaper = new joint.dia.Paper(groupPaperOption)\n\n                    this.graphs[name] = groupGraph\n                    this.papers[name] = groupPaper\n\n                }, this)\n\n            } else {\n\n                // Groups are not used. Render just one paper for the whole stencil.\n                const $elements = this.renderElementsContainer().appendTo(this.$content)\n\n                const graph = new joint.dia.Graph\n                const paper = new joint.dia.Paper(util.assign(paperOptions, {\n                    el: $elements,\n                    model: graph,\n                    width: options.width,\n                    height: options.height\n                }))\n\n                // `this.graphs` object contains only one graph in this case that we store under the key `'__default__'`.\n                this.graphs.__default__ = graph\n                this.papers.__default__ = paper\n            }\n\n            // Create graph and paper objects for the, temporary, dragging phase.\n            // Elements travel the following way when the user drags an element from the stencil and drops\n            // it into the main, associated, paper: `[One of the Stencil graphs] -> [_graphDrag] -> [this.options.graph]`.\n            this._graphDrag = new joint.dia.Graph\n            this._paperDrag = new joint.dia.Paper({\n\n                el: this.$paperDrag,\n                width: 1,\n                height: 1,\n                model: this._graphDrag\n            })\n\n            this.startListening()\n\n            return this\n        },\n\n        startListening: function() {\n\n            this.stopListening()\n\n            // `cell:pointerdown` on any of the Stencil papers triggers element dragging.\n            util.forIn(this.papers, function(paper) {\n                this.listenTo(paper, 'cell:pointerdown', this.onDragStart)\n            }.bind(this))\n        },\n\n        /**\n         * @public\n         * @param {Array.<joint.dia.Element>|Object.<string, Array.<joint.dia.Element>>} cells Array of cells or hash-map\n         * of cells where key is group name.\n         * @param {string=} group\n         */\n        load: function(cells, group) {\n\n            if (Array.isArray(cells)) {\n\n                this.loadGroup(cells, group)\n\n            } else if (util.isObject(cells)) {\n\n                util.forIn(this.options.groups, function(group, name) {\n                    if (cells[name]) {\n                        this.loadGroup(cells[name], name)\n                    }\n                }.bind(this))\n            }\n        },\n\n        /**\n         * @public\n         * Populate stencil with `cells`. If `group` is passed, only the graph in the named group\n         * will be populated\n         * @param {Array.<joint.dia.Element>} cells\n         * @param {string=} group Mandatory in 'group' mode  - 'options.groups' property is defined\n         */\n        loadGroup: function(cells, group) {\n\n            const graph = this.getGraph(group)\n\n            graph.resetCells(cells)\n            // If height is not defined in neither the global `options.height` or local\n            // `height` for this specific group, fit the paper to the content automatically.\n            let paperHeight = this.options.height\n\n            if (group) {\n                paperHeight = this.getGroup(group).height\n            }\n\n            if (this.isLayoutEnabled()) {\n                this.layoutGroup(graph, this.getGroup(group))\n            }\n\n            if (!paperHeight) {\n                const paper = this.getPaper(group)\n                paper.fitToContent({\n                    minWidth: paper.options.width,\n                    gridHeight: 1,\n                    padding: this.options.paperPadding || 10\n                })\n            }\n        },\n\n        /**\n         * @private\n         * @returns {boolean}\n         */\n        isLayoutEnabled: function() {\n\n            return !!(this.options.layout)\n        },\n\n        /**\n         * @public\n         * @param {string=} group\n         * @returns {joint.dia.Graph}\n         */\n        getGraph: function(group) {\n\n            const graph =  this.graphs[group || '__default__']\n            if (!graph) {\n                throw new Error(`Stencil: group ${  group  } does not exist.`)\n            }\n\n            return graph\n        },\n\n        /**\n         * @public\n         * @param {string} group\n         * @returns {joint.dia.Paper}\n         */\n        getPaper: function(group) {\n\n            return this.papers[group || '__default__']\n        },\n\n        preparePaperForDragging: function(cellView, clientX, clientY) {\n\n            const paperDrag = this._paperDrag\n            const graphDrag = this._graphDrag\n\n            // Move the .stencil-paper-drag element to the document body so that even though\n            // the stencil is set to overflow: hidden or auto, the .stencil-paper-drag will\n            // be visible.\n            paperDrag.$el.addClass('dragging').appendTo(document.body)\n\n            const clone = this.options.dragStartClone(cellView.model).position(0,0)\n\n            // Leave some padding so that e.g. the cell shadow or thick border is visible.\n            // This workaround can be removed once browsers start supporting getStrokeBBox() (http://www.w3.org/TR/SVG2/types.html#__svg__SVGGraphicsElement__getStrokeBBox).\n            let padding = 5\n\n            const {snaplines} = this.options\n            if (snaplines) {\n                padding += snaplines.options.distance\n            }\n\n            if (snaplines || this.options.scaleClones) {\n                // Scaling the paper drag, so the clone view match the\n                // size of the resulting size as would be placed in the paper.\n                const paperScale = this.options.paper.scale()\n                paperDrag.scale(paperScale.sx, paperScale.sy)\n                padding *= Math.max(paperScale.sx, paperScale.sy)\n            } else {\n                // restore scale\n                paperDrag.scale(1, 1)\n            }\n\n            // Make sure the previous clone has been removed before we add a new one.\n            this.clearClone()\n            if (this.options.dropAnimation) {\n                // clear the animation after previous onDropInvalid\n                this._paperDrag.$el.stop(true, true)\n            }\n\n            graphDrag.resetCells([clone.position(0, 0)])\n\n            const cloneView = clone.findView(paperDrag)\n\n            // Do not automatically update the cell view while dragging.\n            cloneView.stopListening()\n            paperDrag.fitToContent({ padding: padding, allowNewOrigin: 'any' })\n\n            const cloneViewBBox = cloneView.getBBox()\n            const cloneGeometryBBox = this._cloneGeometryBBox = cloneView.getBBox({ useModelGeometry: true })\n            this._cloneViewDeltaOrigin = cloneGeometryBBox.origin().difference(cloneViewBBox.origin())\n            this._cloneBBox = clone.getBBox()\n            this._clone = clone\n            this._cloneView = cloneView\n            this._paperDragPadding = padding\n            this._paperDragInitialOffset = this.setPaperDragOffset(clientX, clientY)\n        },\n\n        setPaperDragOffset: function(clientX, clientY) {\n\n            // Safari uses `document.body.scrollTop` only while Firefox uses `document.documentElement.scrollTop` only.\n            // Google Chrome is the winner here as it uses both.\n            const scrollTop = document.body.scrollTop || document.documentElement.scrollTop\n\n            // Offset the paper so that the mouse cursor points to the center of the stencil element.\n            // Also, store the original coordinates so that we know where to return if `dropAnimation` is enabled.\n            const cloneViewDeltaOrigin = this._cloneViewDeltaOrigin\n            const cloneGeometryBBox = this._cloneGeometryBBox\n            const padding = this._paperDragPadding || 5\n            const paperDragOffset = {\n                left: clientX - cloneViewDeltaOrigin.x - cloneGeometryBBox.width / 2 - padding,\n                top: clientY - cloneViewDeltaOrigin.y - cloneGeometryBBox.height / 2 - padding + scrollTop\n            }\n            this._paperDrag.$el.offset(paperDragOffset)\n\n            return paperDragOffset\n        },\n\n        setCloneLocalPosition: function(clientX, clientY) {\n\n            const localPosition = this.options.paper.clientToLocalPoint({ x: clientX, y: clientY })\n            const cloneBBox = this._cloneBBox\n\n            localPosition.x -= cloneBBox.width / 2\n            localPosition.y -= cloneBBox.height / 2\n\n            // We don't want the clone view react on change:position change.\n            // But we want processEmbedding to take the clone new position into account,\n            // when it looks for models for which the clone can be embedded in.\n            this._clone.set('position', localPosition)\n\n            return localPosition\n        },\n\n        onDragStart: function(cellView, evt) {\n\n            evt.preventDefault()\n            // Start the dragging batch\n            // Batch might contain `add`, `change:parent`, `change:embeds` events.\n            this.options.graph.startBatch('stencil-drag')\n\n            this.$el.addClass('dragging')\n            this.preparePaperForDragging(cellView, evt.clientX, evt.clientY)\n\n            const localPoint = this.setCloneLocalPosition(evt.clientX, evt.clientY)\n            const cloneView = this._cloneView\n\n            // snaplines\n            const {snaplines} = this.options\n            if (snaplines) {\n\n                snaplines.captureCursorOffset(this._cloneView, evt, localPoint.x, localPoint.y)\n\n                cloneView.listenTo(this._clone, 'change:position', this.onCloneSnapped.bind(this))\n            }\n\n            this.delegateDocumentEvents(null, evt.data)\n        },\n\n        onCloneSnapped: function(clone, position, opt) {\n            // Snapline plugin adds `snapped` flag when changing element's position\n            if (opt.snapped) {\n                const cloneBBox = this._cloneBBox\n                // Set the position of the element to it's original drag paper position\n                // and add the snapped offset. This is required by the view `translate` method,\n                // which updates the element view position based on the model values.\n                clone.position(cloneBBox.x + opt.tx, cloneBBox.y + opt.ty, { silent: true })\n                this._cloneView.translate()\n                // Restore the element's local position\n                clone.set('position', position, { silent: true })\n\n                this._cloneSnapOffset = { x: opt.tx, y: opt.ty }\n\n            } else {\n\n                this._cloneSnapOffset = null\n            }\n        },\n\n        onDrag: function(evt) {\n\n            const cloneView = this._cloneView\n            if (cloneView) {\n                evt.preventDefault()\n                evt = util.normalizeEvent(evt)\n\n                const {clientX} = evt\n                const {clientY} = evt\n                this.setPaperDragOffset(clientX, clientY)\n\n                const localPoint = this.setCloneLocalPosition(clientX, clientY)\n\n                const embedding = this.options.paper.options.embeddingMode\n                const {snaplines} = this.options\n                const insideValidArea = (embedding || snaplines) && this.insideValidArea({ x: clientX, y: clientY })\n\n                if (embedding) {\n                    cloneView.eventData(evt, { paper: this.options.paper })\n                    const data = cloneView.eventData(evt)\n                    if (insideValidArea) {\n                        cloneView.processEmbedding(data)\n                    } else {\n                        cloneView.clearEmbedding(data)\n                    }\n                }\n\n                if (snaplines) {\n                    if (insideValidArea) {\n                        snaplines.snapWhileMoving(cloneView, evt, localPoint.x, localPoint.y)\n                    } else {\n                        snaplines.hide()\n                    }\n                }\n            }\n        },\n\n        onDragEnd: function(evt) {\n\n            const dragClone = this._clone\n            if (dragClone) {\n\n                evt = util.normalizeEvent(evt)\n\n                const cloneView = this._cloneView\n                const cloneBBox = this._cloneBBox\n                const snapOffset = this._cloneSnapOffset\n\n                let {x} = cloneBBox\n                let {y} = cloneBBox\n                // add the element offset caused by the snaplines\n                if (snapOffset) {\n                    x += snapOffset.x\n                    y += snapOffset.y\n                }\n\n                // Restore the original clone position if this was changed during the embedding.\n                dragClone.position(x, y, { silent: true })\n\n                const cellClone = this.options.dragEndClone(dragClone)\n                const dropped = this.drop(cellClone, { x: evt.clientX, y: evt.clientY })\n\n                if (!dropped) {\n\n                    this.onDropInvalid(evt, cellClone)\n\n                } else {\n\n                    this.onDropEnd(dragClone)\n                }\n\n                // embedding\n                if (this.options.paper.options.embeddingMode && cloneView) {\n                    cloneView.eventData(evt, { model: cellClone, paper: this.options.paper })\n                    cloneView.finalizeEmbedding(cloneView.eventData(evt))\n                }\n\n                // snaplines\n                // it's hide on document mouseup by the plugin itself\n\n                // End the dragging batch.\n                this.options.graph.stopBatch('stencil-drag')\n            }\n        },\n\n        onDropEnd: function(cellClone) {\n\n            if (this._clone === cellClone) {\n\n                this.clearClone()\n\n                // Move the .stencil-paper-drag from the document body back to the stencil element.\n                this.$el.append(this._paperDrag.$el)\n\n                this.$el.removeClass('dragging')\n                this._paperDrag.$el.removeClass('dragging')\n            }\n        },\n\n        clearClone: function() {\n\n            if (this._clone) {\n                this._clone.remove()\n                this._clone = null\n                this._cloneView = null\n                this._cloneSnapOffset = null\n                this._paperDragInitialOffset = null\n                this._paperDragPadding = null\n            }\n        },\n\n        onDropInvalid: function(evt, cellClone) {\n\n            const clone = this._clone\n            if (clone) {\n\n                evt = util.normalizeEvent(evt)\n\n                cellClone = cellClone || this.options.dragEndClone(clone)\n\n                // Tell the outside world that the drop was not successful.\n                this.trigger('drop:invalid', evt, cellClone)\n\n                const {dropAnimation} = this.options\n                if (dropAnimation) {\n\n                    const duration = util.isObject(dropAnimation) ? dropAnimation.duration : 150\n                    const easing = util.isObject(dropAnimation) ? dropAnimation.easing : 'swing'\n\n                    // clear the view immediately to prevent user's interaction on the returning shape\n                    this._cloneView = null\n                    this._paperDrag.$el.animate(this._paperDragInitialOffset, duration, easing, this.onDropEnd.bind(this, clone))\n\n                } else {\n\n                    this.onDropEnd(clone)\n                }\n            }\n        },\n\n        // Return `true` if the point `p` falls into the valid area for dropping.\n        insideValidArea: function(p) {\n\n            const {paper} = this.options\n            const {paperScroller} = this.options\n\n            const stencilArea = this.getDropArea(this.$el)\n            let validArea\n\n            if (!paperScroller) {\n\n                // No paper scroller used. Use entire paper area.\n                validArea = this.getDropArea(paper.$el)\n\n            } else if (paperScroller.options.autoResizePaper) {\n\n                // Paper scroller used with auto-resize enabled.\n                // We can use the entire paperScroller area for drop.\n                validArea = this.getDropArea(paperScroller.$el)\n\n            } else {\n\n                // Paper scroller used with auto-resize disabled.\n                // The element can be dropped only into the visible part of the paper.\n                const scrollerArea = this.getDropArea(paperScroller.$el)\n                const paperArea = this.getDropArea(paper.$el)\n\n                validArea = paperArea.intersect(scrollerArea)\n            }\n\n            // Check if the cell is dropped inside the paper but not inside the stencil.\n            // Check for the stencil is here because the paper can go \"below\" the stencil\n            // if the paper is larger than the ui.PaperScroller area.\n            if (validArea && validArea.containsPoint(p) && !stencilArea.containsPoint(p)) return true\n\n            return false\n        },\n\n        getDropArea: function($el) {\n\n            const position = $el.offset()\n            const scrollTop = document.body.scrollTop || document.documentElement.scrollTop\n            const scrollLeft = document.body.scrollLeft || document.documentElement.scrollLeft\n\n            return g.rect({\n                x: position.left + parseInt($el.css('border-left-width'), 10) - scrollLeft,\n                y: position.top + parseInt($el.css('border-top-width'), 10) - scrollTop,\n                width: $el.innerWidth(),\n                height: $el.innerHeight()\n            })\n        },\n\n        drop: function(cell, p) {\n\n            const {paper} = this.options\n            const {graph} = this.options\n\n            // Check if the cell is dropped inside the paper.\n            if (this.insideValidArea(p)) {\n\n                const pointTransformed = paper.clientToLocalPoint(p)\n                const cellBBox = cell.getBBox()\n\n                pointTransformed.x += cellBBox.x - cellBBox.width / 2\n                pointTransformed.y += cellBBox.y - cellBBox.height / 2\n\n                // Do not snap to grid if the element was previously snapped to certain position.\n                const gridSize = (this._cloneSnapOffset) ? 1 : paper.options.gridSize\n\n                cell.set('position', {\n                    x: g.snapToGrid(pointTransformed.x, gridSize),\n                    y: g.snapToGrid(pointTransformed.y, gridSize)\n                })\n\n                // `z` level will be set automatically in the `this.graph.addCell()` method.\n                // We don't want the cell to have the same `z` level as it had in the temporary paper.\n                cell.unset('z')\n\n                graph.addCell(cell, { stencil: this.cid })\n                return true\n            }\n\n            return false\n        },\n\n        filter: function(keyword, cellAttributesMap) {\n\n            // a searching mode when the keyword consists of lowercase only\n            // e.g 'keyword' matches 'Keyword' but not other way round\n            const lowerCaseOnly = keyword.toLowerCase() == keyword\n\n            // We go through each paper.model, filter its cells and watch whether we found a match\n            // yet or not.\n\n            const match = Object.keys(this.papers).reduce(function(wasMatch, group) {\n\n                const paper = this.papers[group]\n                // an array of cells that matches a search criteria\n                const matchedCells = paper.model.get('cells').filter(function(cell) {\n\n                    const cellView = paper.findViewByModel(cell)\n\n                    // check whether the currect cell matches a search criteria\n                    const cellMatch = !keyword || Object.keys(cellAttributesMap).some(function(type) {\n                        const paths = cellAttributesMap[type]\n\n                        if (type != '*' && cell.get('type') != type) {\n                            // type is not universal and doesn't match the current cell\n                            return false\n                        }\n\n                        // find out if any of specific cell attributes matches a search criteria\n                        const attributeMatch = paths.some(function(path) {\n\n                            let value = util.getByPath(cell.attributes, path, '/')\n\n                            if (value === undefined || value === null) {\n                                // if value undefined than current attribute doesn't match\n                                return false\n                            }\n\n                            // convert values to string first (e.g value could be a number)\n                            value = value.toString()\n\n                            if (lowerCaseOnly) {\n                                value = value.toLowerCase()\n                            }\n\n                            return value.indexOf(keyword) >= 0\n                        })\n\n                        return attributeMatch\n                    })\n\n                    // each element that does not match a search has 'unmatched' css class\n                    V(cellView.el).toggleClass('unmatched', !cellMatch)\n\n                    return cellMatch\n\n                }, this)\n\n                const isMatch = !util.isEmpty(matchedCells)\n\n                // create a graph contains only filtered elements.\n                const filteredGraph = (new joint.dia.Graph).resetCells(matchedCells)\n\n                // let the outside world know that the group was filtered\n                this.trigger('filter', filteredGraph, group, keyword)\n\n                if (this.isLayoutEnabled()) {\n                    this.layoutGroup(filteredGraph, this.getGroup(group))\n                }\n\n                if (this.$groups[group]) {\n                    // add 'unmatched' class when filter matches no elements in the group\n                    this.$groups[group].toggleClass('unmatched', !isMatch)\n                }\n\n                paper.fitToContent({\n                    gridWidth: 1,\n                    gridHeight: 1,\n                    padding: this.options.paperPadding || 10\n                })\n\n                return wasMatch || isMatch\n\n            }.bind(this), false)\n\n            // When no match found we add 'not-found' class on the stencil element\n            this.$el.toggleClass('not-found', !match)\n        },\n\n        /**\n         * @private\n         * @param {string} name\n         * @returns {Object}\n         */\n        getGroup: function(name) {\n\n            return this.options.groups && this.options.groups[name] || {}\n        },\n\n        /**\n         * @private\n         * @param {jQuery.Event} evt\n         */\n        onSearch: function(evt) {\n\n            this.filter(evt.target.value, this.options.search)\n        },\n\n        /**\n         * @private\n         */\n        pointerFocusIn: function() {\n            this.$el.addClass('is-focused')\n        },\n\n        /**\n         * @private\n         */\n        pointerFocusOut: function() {\n            this.$el.removeClass('is-focused')\n        },\n\n        /**\n         * @private\n         * @param {jQuery.Event} evt\n         */\n        onGroupLabelClick: function(evt) {\n\n            // Prevent touch devices not to handle this event twice.\n            // Note that both touchstart and click (evt mousedown) are fired.\n            if (evt.type === 'touchstart') {\n                this._groupLabelClicked = true\n            } else if (this._groupLabelClicked && evt.type === 'click') {\n                this._groupLabelClicked = false\n                return\n            }\n\n            const $group = $(evt.target).closest('.group')\n            this.toggleGroup($group.data('name'))\n        },\n\n        /**\n         * @public\n         * @param {string} name\n         */\n        toggleGroup: function(name) {\n\n            this.$(`.group[data-name=\"${  name  }\"]`).toggleClass('closed')\n        },\n\n        /**\n         * @public\n         * @param {string} name\n         */\n        closeGroup: function(name) {\n\n            this.$(`.group[data-name=\"${  name  }\"]`).addClass('closed')\n        },\n\n        /**\n         * @public\n         * @param {string} name\n         */\n        openGroup: function(name) {\n\n            this.$(`.group[data-name=\"${  name  }\"]`).removeClass('closed')\n        },\n\n        /**\n         * @public\n         * @param {string} name\n         */\n        isGroupOpen: function(name) {\n\n            return !this.$(`.group[data-name=\"${  name  }\"]`).hasClass('closed')\n        },\n\n        /**\n         * @public\n         */\n        closeGroups: function() {\n\n            this.$('.group').addClass('closed')\n        },\n\n        /**\n         * @public\n         */\n        openGroups: function() {\n\n            this.$('.group').removeClass('closed')\n        },\n\n        /**\n         * @private\n         */\n        onRemove: function() {\n\n            util.invoke(this.papers, 'remove')\n            this.papers = {}\n\n            if (this._paperDrag) {\n                this._paperDrag.remove()\n                this._paperDrag = null\n            }\n\n            this.undelegateDocumentEvents()\n        }\n    })\n\n}(joint, joint.util));\n\n// Inspector plugin.\n// -----------------\n\n// This plugin creates a two-way data-binding between the cell model and a generated\n// HTML form with input fields of a type declaratively specified in an options object passed\n// into the element inspector.\n\n/*\nUSAGE:\n\nvar inspector = new joint.ui.Inspector({\n    cellView: cellView,\n    inputs: {\n            attrs: {\n                text: {\n                    'font-size': { type: 'number', min: 5, max: 80, group: 'text', index: 2 },\n                    'text': { type: 'textarea', group: 'text', index: 1 }\n                }\n            },\n            position: {\n                x: { type: 'number', group: 'geometry', index: 1 },\n                y: { type: 'number', group: 'geometry', index: 2 }\n            },\n            size: {\n                width: { type: 'number', min: 1, max: 500, group: 'geometry', index: 3 },\n                height: { type: 'number', min: 1, max: 500, group: 'geometry', index: 4 }\n            },\n            mydata: {\n                foo: { type: 'textarea', group: 'data' }\n            }\n   },\n   groups: {\n           text: { label: 'Text', index: 1 },\n           geometry: { label: 'Geometry', index: 2, closed: true },\n           data: { label: 'data', index: 3 }\n   }\n});\n\n$('.inspector-container').append(inspector.render().el);\n*/\n\n(function(joint, util) {\n    \n\n    joint.ui.Inspector = joint.mvc.View.extend({\n\n        className: 'inspector',\n\n        options: {\n            cellView: undefined,    // One can pass either a cell view ...\n            cell: undefined,        // ... or the cell itself.\n            live: true,      // By default, we enabled live changes from the inspector inputs.\n            validateInput: function(input, path, type) {\n                return input.validity ? input.validity.valid : true\n            },\n            renderFieldContent: undefined, // function(options, path, value) { return html }\n            // Custom operators can be defined here as `function(cell, value, argument*) { return boolean; }`\n            // e.g. { longerThan: function (cell, value, prop) { return value.length > cell.prop(prop); }}\n            operators: {},\n            multiOpenGroups: true,   // `true` if the Inspector is supposed to allow multiple open groups at the same time. Set to `false` for classical accordion.\n\n            /**\n             * Used for logic of store/restore currently opened/stored groups.\n             * @params {joint.dia.Cell} model\n             * @returns {string}\n             * */\n            stateKey: function(model) {\n                return model.id\n            }\n        },\n\n        events: {\n            // Custom fields need to call updateCell() explicitely\n            'change [data-attribute]:not([data-custom-field])': 'onChangeInput',\n            'click .group-label': 'onGroupLabelClick',\n            'click .btn-list-add': 'addListItem',\n            'click .btn-list-del': 'deleteListItem',\n            'mousedown .field': 'pointerdown',\n            'touchstart .field': 'pointerdown',\n            'focusin .field': 'pointerfocusin',\n            'focusout .field': 'pointerfocusout'\n        },\n\n        HTMLEntities: {\n            lt: '<',\n            gt: '>',\n            amp: '&',\n            nbsp: ' ',\n            quot: '\"',\n            cent: '¢',\n            pound: '£',\n            euro: '€',\n            yen: '¥',\n            copy: '©',\n            reg: '®'\n        },\n\n        init: function() {\n\n            const groups = this.options.groups = this.options.groups || {}\n\n            joint.util.bindAll(this, 'stopBatchCommand', 'pointerup', 'onContentEditableBlur', 'replaceHTMLEntity')\n\n            // List of built-in widgets (references to their views). This allows\n            // us to clean up the views (call `remove()` method on them) whenever the\n            // inspector need to re-render.\n            this.widgets = {}\n\n            this._attributeKeysInUse = []\n\n            // Flatten the `inputs` object until the level where the options object is.\n            // This produces an object with this structure: { <path>: <options> }, e.g. { 'attrs/rect/fill': { type: 'color' } }\n            this.flatAttributes = this.flattenInputs(this.options.inputs)\n\n            // expand attributes {'a/b/c': { type: 'number'} => {a: {b: {c: {type:'number'}}}\n            this.expandAttributes = this.expandAttrs(this.options.inputs || {})\n\n            // `_when` object maps path to a set of conditions (either `eq` or `regex`).\n            // When an input under the path changes to\n            // the value that equals all the `eq` values or matches all the `regex` regular expressions,\n            // the inspector rerenders itself and this time includes all the\n            // inputs that met the conditions.\n            this._when = {}\n\n            // `_bound` object maps a slave path to a master path (A slave is using master's data).\n            // When an input under the master path changes, the inspector re-renders the input under the\n            // slave path\n            this._bound = {}\n\n            // Add the attributes path the options object as we're converting the flat object to an array\n            // and so we would loose the keys otherwise.\n            const attributesArray = Object.keys(this.flatAttributes).map(function(path) {\n\n                const options = this.flatAttributes[path]\n\n                if (options.when) {\n\n                    const dependant = { expression: options.when, path: path }\n\n                    this.extractExpressionPaths(dependant.expression).forEach(function(condPath) {\n                        (this._when[condPath] || (this._when[condPath] = [])).push(dependant)\n                    }, this)\n                }\n\n                // If the option type is 'select' and its options needs resolving (is defined by path)\n                // we bind the select (slave) and the input under the path (master) together.\n                if (this.needsResolving(options)) {\n                    // slave : master\n                    this._bound[path] = options.options\n                }\n\n                options.path = path\n                return options\n\n            }, this)\n\n            // Add dependency paths from the groups `when` expressions. We are making sure here,\n            // they are added as a key only (we're not adding them to array of inputs!)\n            for (const groupName in groups) {\n                const groupOptions = groups[groupName]\n                if (groupOptions && groups.hasOwnProperty(groupName)) {\n                    this.extractExpressionPaths(groupOptions.when).forEach(function(condPath) {\n                        if (!this._when[condPath]) this._when[condPath] = []\n                    }, this)\n                }\n            }\n\n            // Sort the flat attributes object by two criteria: group first, then index inside that group.\n            // As underscore 'sortBy' is a stable sort algorithm we can sort by index first and then\n            // by group again.\n            const sortedByIndexAttributes = util.sortBy(attributesArray, 'index')\n            this.groupedFlatAttributes = util.sortBy(sortedByIndexAttributes, function(options) {\n                const groupOptions = this.options.groups[options.group]\n                return (groupOptions && groupOptions.index) || Number.MAX_VALUE\n            }.bind(this))\n\n            // Listen on events on the cell.\n            this.listenTo(this.getModel(), 'all', this.onCellChange, this)\n        },\n\n        // Cache all the attributes (inputs, lists and objects) with every change to the DOM tree.\n        // Chache it by its path.\n        cacheInputs: function() {\n\n            const byPath = {}\n\n            Array.from(this.$('[data-attribute]')).forEach(function(attribute) {\n                const $attribute = $(attribute)\n                const path = $attribute.attr('data-attribute')\n                byPath[path] = $attribute\n            }, this)\n\n            this._byPath = byPath\n            this._attributeKeysInUse = this.getAttributeKeysInUse()\n        },\n\n        updateGroupsVisibility: function() {\n\n            const {$groups} = this\n\n            for (let i = 0, n = $groups.length; i < n; i++) {\n\n                const $group = $($groups[i])\n                const groupName = $group.attr('data-name')\n                const options = this.options.groups[groupName]\n\n                // If a group fields are all hidden mark the group with 'empty' class name.\n                const isGroupEmpty = ($group.find('> .field:not(.hidden)').length === 0)\n                $group.toggleClass('empty', isGroupEmpty)\n\n                const isGroupHidden = !!(options && options.when && !this.isExpressionValid(options.when))\n                $group.toggleClass('hidden', isGroupHidden)\n            }\n        },\n\n        expandAttrs: function(inputs, result) {\n\n            result = result || {}\n\n            const keys = Object.keys(inputs)\n            for (let i = 0; i < keys.length; i++) {\n                const key = keys[i]\n\n                const value = inputs[key]\n\n                const parts = key.split('/')\n\n                if (parts.length > 1) {\n                    util.setByPath(result, parts, value)\n                } else {\n                    result[key] = util.isPlainObject(value) ? this.expandAttrs(value) : value\n                }\n            }\n\n            return result\n        },\n\n        flattenInputs: function(inputs) {\n            return joint.util.flattenObject(inputs, '/', function(obj) {\n                // Stop flattening when we reach an object that contains the `type` string property . We assume\n                // that this is our options object.\n                return (typeof obj.type === 'string')\n            })\n        },\n\n        getModel: function() {\n            return this.options.cell || this.options.cellView.model\n        },\n\n        onCellChange: function(eventName, cell, change, opt) {\n\n            opt = opt || {}\n\n            // Do not react on changes that happened inside this inspector. This would\n            // cause a re-render of the same inspector triggered by an input change in this inspector.\n            if (opt.inspector == this.cid) return\n\n            // Note that special care is taken for all the transformation attribute changes\n            // (`position`, `size` and `angle`). See below for details.\n\n            switch (eventName) {\n\n                case 'remove':\n                    // Make sure the element inspector gets removed when the cell is removed from the graph.\n                    // Otherwise, a zombie cell could possibly be updated.\n                    this.remove()\n                    break\n                case 'change:position':\n                    // Make a special case for `position` as this one is performance critical.\n                    // There is no need to rerender the whole inspector but only update the position input.\n                    this.updateInputPosition()\n                    break\n                case 'change:size':\n                    // Make a special case also for the `size` attribute for the same reasons as for `position`.\n                    this.updateInputSize()\n                    break\n                case 'change:angle':\n                    // Make a special case also for the `angle` attribute for the same reasons as for `position`.\n                    this.updateInputAngle()\n                    break\n                case 'change:source':\n                case 'change:target':\n                case 'change:vertices':\n                    // Make a special case also for the 'source' and 'target' of a link for the same reasons\n                    // as for 'position'. We don't expect source or target to be configurable.\n                    // That's why we do nothing here.\n                    break\n                default:\n                    // Re-render only on specific attributes changes. These are all events that starts with `'change:'`.\n                    // Otherwise, the re-render would be called unnecessarily (consider generic `'change'` event, `'bach:start'`, ...).\n                    var changeAttributeEvent = 'change:'\n                    if (eventName.slice(0, changeAttributeEvent.length) === changeAttributeEvent) {\n                        // re-render the inspector only if the changed atrribute is displayed by the inspector\n                        const attributeKey = eventName.slice(changeAttributeEvent.length)\n                        if (this._attributeKeysInUse.includes(attributeKey)) {\n                            this.render({ refresh: true })\n                        }\n                    }\n                    break\n            }\n        },\n\n        render: function(opt) {\n\n            const refresh = (opt && opt.refresh)\n            if (refresh && this.options.storeGroupsState) {\n                this.storeGroupsState()\n            }\n\n            this.$el.empty()\n            this.removeWidgets()\n\n            let lastGroup\n            const groups = []\n            let $group\n\n            this.groupedFlatAttributes.forEach(function(options) {\n\n                if (lastGroup !== options.group) {\n                    // A new group should be created.\n\n                    const groupOptions = this.options.groups[options.group]\n\n                    $group = this.renderGroup({\n                        name: options.group,\n                        label: groupOptions && groupOptions.label\n                    })\n\n                    if (!refresh) {\n                        if (groupOptions && groupOptions.closed) {\n                            this.closeGroup($group, { init: true })\n                        } else {\n                            this.openGroup($group, { init: true })\n                        }\n                    }\n\n                    groups.push($group)\n                }\n\n                this.renderTemplate($group, options, options.path)\n\n                lastGroup = options.group\n\n            }, this)\n\n            // cache groups\n\n            this.$document = $(this.el.ownerDocument)\n            this.$groups = $(groups)\n\n            this.$el.append(groups)\n\n            if (refresh && this.options.restoreGroupsState) {\n                this.restoreGroupsState()\n            }\n\n            this.afterRender()\n\n            return this\n        },\n\n        getAttributeKeysInUse: function() {\n\n            // all attributes used explicitely in the `inputs` definition\n            const inputsAttributeKeys =  Object.keys(this._byPath).map(function(path) {\n                return path.substring(0, path.indexOf('/')) || path\n            })\n\n            // all attributes that are bound by the selection `options` reference\n            const boundedAttributeKeys = util.toArray(this._bound)\n\n            // all attributes that are part of the `when` expression\n            const dependantAttributeKeys =  Object.keys(this._when)\n\n            return util.uniq([].concat(inputsAttributeKeys, boundedAttributeKeys, dependantAttributeKeys))\n        },\n\n        // Get the value of the attribute at `path` based on the `options.defaultValue`,\n        // and `options.valueRegExp` if present.\n        getCellAttributeValue: function(path, options) {\n\n            const cell = this.getModel()\n            let value = joint.util.getByPath(cell.attributes, path, '/')\n\n            options = options || this.flatAttributes[path]\n            if (!options) return value\n\n            if (value === undefined && options.defaultValue !== undefined) {\n                value = options.defaultValue\n            }\n\n            if (options.valueRegExp) {\n\n                if (value === undefined) {\n\n                    throw new Error('Inspector: defaultValue must be present when valueRegExp is used.')\n                }\n\n                const valueMatch = value.match(new RegExp(options.valueRegExp))\n                value = valueMatch && valueMatch[2]\n            }\n\n            return value\n        },\n\n        resolvableTypes: ['select', 'select-box', 'color-palette', 'select-button-group'],\n\n        needsResolving: function(options) {\n\n            return !!options && this.resolvableTypes.indexOf(options.type) > -1 && joint.util.isString(options.options)\n        },\n\n        resolveBindings: function(options) {\n\n            if (this.resolvableTypes.indexOf(options.type) > -1) {\n\n                // options['options'] are transformed here to options['items']\n                let items = options.options || []\n\n                // resolve items if the options are defined indirectly as a reference to a model property\n                if (joint.util.isString(items)) {\n\n                    items = joint.util.getByPath(this.getModel().attributes, items, '/') || []\n                }\n\n                // Check if items array has incorrect format (i.e an array of strings).\n                if (!joint.util.isObject(items[0])) {\n                    // Transform each array item into the { value: [value], content: [content] } object.\n                    items = util.toArray(items).map(function(item) {\n                        return { value: item, content: item }\n                    })\n                }\n\n                // export result as 'items'\n                options.items = items\n            }\n\n        },\n\n        updateBindings: function(path) {\n\n            // Find all inputs which are bound to the current input (i.e find all slaves).\n            const slaves = Object.keys(this._bound).reduce(function(result, slave) {\n\n                const master = this._bound[slave]\n                // Does the current input path starts with a master path?\n                if (path.indexOf(master) === 0) result.push(slave)\n                return result\n            }.bind(this), [])\n\n            if (!joint.util.isEmpty(slaves)) {\n\n                // Re-render all slave inputs\n                slaves.forEach(function(slave) {\n                    this.renderTemplate(null, this.flatAttributes[slave], slave, { replace: true })\n                }, this)\n\n                this.afterRender()\n            }\n        },\n\n        renderFieldContent: function(options, path, value) {\n\n            let fieldHtml\n\n            // Give the outside world a chance to render the field.\n            // It is the responsibility of the programmer to call `updateCell()` whenever the custom field changes value.\n            if (joint.util.isFunction(this.options.renderFieldContent)) {\n\n                fieldHtml = this.options.renderFieldContent(options, path, value)\n                if (fieldHtml) {\n                    return $(fieldHtml).attr({\n                        'data-attribute': path,\n                        'data-type': options.type,\n                        'data-custom-field': true\n                    })\n                }\n            }\n\n            let widget\n            let selectedIndex\n            let originalSelection\n            let $label\n\n            // Note that widgets might also have special ways of reporting changed values.\n            switch (options.type) {\n\n                case 'select-box':\n                    selectedIndex = joint.util.toArray(options.items).findIndex(function(option) {\n                        let optionValue = option.value\n                        let modelValue = value\n                        if (optionValue === undefined && option.content === modelValue) return true\n                        const {key} = options\n                        if (key) {\n                            modelValue = joint.util.getByPath(modelValue, key, '/')\n                            optionValue = joint.util.getByPath(optionValue, key, '/')\n                        }\n                        return joint.util.isEqual(optionValue, modelValue)\n                    })\n                    var selectBoxOptions = joint.util.assign({\n                        theme: this.options.theme\n                    }, joint.util.omit(options, 'type', 'group', 'index', 'selectBoxOptionsClass', 'options'), {\n                        options: options.items,\n                        selected: selectedIndex,\n                        // add special class name on select-box options that originates from the inspector\n                        selectBoxOptionsClass: [\n                            joint.util.addClassNamePrefix('inspector-select-box-options'),\n                            options.selectBoxOptionsClass\n                        ].filter(function(item) {\n                            return !!item\n                        }).join(' ')\n                    })\n                    widget = new joint.ui.SelectBox(selectBoxOptions)\n                    widget.$el.attr({\n                        'data-attribute': path,\n                        'data-type': options.type,\n                        'data-overwrite': options.overwrite\n                    })\n                    widget.render()\n                    $label = $('<label/>', { html: options.label || path })\n                    fieldHtml = $('<div/>').append($label, widget.el)\n\n                    // In `previewMode`, cell gets updated when the user hovers\n                    // over the options in the select box. However, the final\n                    // value is reset only when the user selects an option.\n                    if (options.previewMode) {\n\n                        originalSelection = widget.selection\n\n                        widget.on('options:mouseout close', function() {\n                            widget.selection = originalSelection\n                            this.processInput(widget.$el, { previewCancel: true, dry: true })\n                        }, this)\n\n                        widget.on('option:hover', function(option, index) {\n                            widget.selection = option\n                            // Update the cell in `dry` run. `dry` run gives hint to the\n                            // outside application that even though the model updated,\n                            // we don't have to e.g. store the change into DB.\n                            this.processInput(widget.$el, { dry: true })\n                        }, this)\n\n                        widget.on('option:select', function(option, index) {\n                            const originalValue = originalSelection === undefined ? undefined : widget.getSelectionValue(originalSelection)\n                            const newValue = widget.getSelectionValue(option)\n                            // If the original value equals the new value, run the update\n                            // in `dry` mode as there is no need to tell the outside application\n                            // that the model has changed (and possibly needs to be updated in e.g. a DB).\n                            const dry = originalValue === newValue\n                            // `previewDone` is only used internally inside ui.Inspector\n                            // to tell the `setProperty()` method that it should trigger\n                            // a change event.\n                            this.processInput(widget.$el, {\n                                previewDone: true,\n                                dry: dry,\n                                originalValue: originalValue\n                            })\n                            originalSelection = option\n                        }, this)\n\n                    } else {\n\n                        widget.on('option:select', function(option, index) {\n                            this.processInput(widget.$el)\n                        }, this)\n                    }\n\n                    this.widgets[path] = widget\n                    break\n\n                case 'color-palette':\n                    selectedIndex = joint.util.toArray(options.items).findIndex(function(option) {\n                        if (option.value === value) return true\n                        if (option.value === undefined && option.content === value) return true\n                        return false\n                    })\n                    var colorPalletteOptions = joint.util.assign({\n                        theme: this.options.theme\n                    }, joint.util.omit(options, 'type', 'group', 'index', 'options'), {\n                        options: options.items,\n                        selected: selectedIndex\n                    })\n                    widget = new joint.ui.ColorPalette(colorPalletteOptions)\n                    widget.$el.attr({\n                        'data-attribute': path,\n                        'data-type': options.type\n                    })\n                    widget.render()\n                    $label = $('<label/>', { html: options.label || path })\n                    fieldHtml = $('<div/>').append($label, widget.el)\n\n                    // In `previewMode`, cell gets updated when the user hovers\n                    // over the options in the color palette. However, the final\n                    // value is reset only when the user selects an option.\n                    if (options.previewMode) {\n\n                        originalSelection = widget.selection\n\n                        widget.on('options:mouseout close', function() {\n                            widget.selection = originalSelection\n                            this.processInput(widget.$el, { previewCancel: true, dry: true })\n                        }, this)\n\n                        widget.on('option:hover', function(option, index) {\n                            widget.selection = option\n                            this.processInput(widget.$el, { dry: true })\n                        }, this)\n\n                        widget.on('option:select', function(option, index) {\n                            const originalValue = originalSelection === undefined ? undefined : widget.getSelectionValue(originalSelection)\n                            const newValue = widget.getSelectionValue(option)\n                            // If the original value equals the new value, run the update\n                            // in `dry` mode as there is no need to tell the outside application\n                            // that the model has changed (and possibly needs to be updated in e.g. a DB).\n                            const dry = (originalValue === newValue)\n                            // `previewDone` is only used internally inside ui.Inspector\n                            // to tell the `setProperty()` method that it should trigger\n                            // a change event.\n                            this.processInput(widget.$el, {\n                                previewDone: true,\n                                dry: dry,\n                                originalValue: originalValue\n                            })\n                            originalSelection = option\n                        }, this)\n\n                    } else {\n\n                        widget.on('option:select', function(option, index) {\n                            this.processInput(widget.$el)\n                        }, this)\n                    }\n\n                    this.widgets[path] = widget\n                    break\n\n                case 'select-button-group':\n                    if (options.multi) {\n                        selectedIndex = []\n                        joint.util.toArray(options.items).forEach(function(option, idx) {\n                            let val1 = option.value === undefined ? option.content : option.value\n                            const {key} = options\n                            if (key) val1 = joint.util.getByPath(val1, key, '/')\n                            const containsOption = joint.util.toArray(value).find(function(val2) {\n                                if (key) val2 = joint.util.getByPath(val2, key, '/')\n                                return joint.util.isEqual(val1, val2)\n                            })\n                            if (containsOption) {\n                                selectedIndex.push(idx)\n                            }\n                        })\n                    } else {\n                        selectedIndex = joint.util.toArray(options.items).findIndex(function(option) {\n                            let optionValue = option.value\n                            let modelValue = value\n                            if (optionValue === undefined && option.content === modelValue) return true\n                            const {key} = options\n                            if (key) {\n                                modelValue = joint.util.getByPath(modelValue, key, '/')\n                                optionValue = joint.util.getByPath(optionValue, key, '/')\n                            }\n                            return joint.util.isEqual(optionValue, modelValue)\n                        })\n                    }\n                    var selectButtonGroupOptions = joint.util.assign({\n                        theme: this.options.theme\n                    }, joint.util.omit(options, 'type', 'group', 'index', 'options'), {\n                        options: options.items,\n                        selected: selectedIndex\n                    })\n                    widget = new joint.ui.SelectButtonGroup(selectButtonGroupOptions)\n                    widget.$el.attr({\n                        'data-attribute': path,\n                        'data-type': options.type,\n                        'data-overwrite': options.overwrite\n                    })\n                    widget.render()\n                    $label = $('<label/>', { html: options.label || path })\n                    fieldHtml = $('<div/>').append($label, widget.el)\n\n                    // In `previewMode`, cell gets updated when the user hovers\n                    // over the options in the color palette. However, the final\n                    // value is reset only when the user selects an option.\n                    if (options.previewMode) {\n\n                        originalSelection = widget.selection\n\n                        widget.on('mouseout', function() {\n                            widget.selection = originalSelection\n                            this.processInput(widget.$el, { previewCancel: true, dry: true })\n                        }, this)\n\n                        widget.on('option:hover', function(option, index) {\n                            if (options.multi) {\n                                widget.selection = util.uniq(widget.selection.concat([option]))\n                            } else {\n                                widget.selection = option\n                            }\n                            this.processInput(widget.$el, { dry: true })\n                        }, this)\n\n                        widget.on('option:select', function(selection, index) {\n                            const originalValue = originalSelection === undefined ? undefined : widget.getSelectionValue(originalSelection)\n                            const newValue = widget.getSelectionValue(selection)\n                            // If the original value equals the new value, run the update\n                            // in `dry` mode as there is no need to tell the outside application\n                            // that the model has changed (and possibly needs to be updated in e.g. a DB).\n\n                            const dry = joint.util.isEqual(originalValue, newValue)\n                            // `previewDone` is only used internally inside ui.Inspector\n                            // to tell the `setProperty()` method that it should trigger\n                            // a change event.\n                            this.processInput(widget.$el, {\n                                previewDone: true,\n                                dry: dry,\n                                originalValue: originalValue\n                            })\n                            originalSelection = selection\n                        }, this)\n\n                    } else {\n\n                        widget.on('option:select', function(option, index) {\n                            this.processInput(widget.$el)\n                        }, this)\n                    }\n\n                    this.widgets[path] = widget\n                    break\n\n                default:\n                    fieldHtml = this.renderOwnFieldContent({\n                        options: options,\n                        type: options.type,\n                        overwrite: options.overwrite,\n                        label: options.label || path,\n                        attribute: path,\n                        value: value\n                    })\n            }\n\n            return fieldHtml\n        },\n\n        renderGroup: function(opt) {\n\n            opt = opt || {}\n\n            const $group = $('<div/>')\n                .addClass('group')\n                .attr('data-name', opt.name)\n\n            const $label = $('<h3/>')\n                .addClass('group-label')\n                .text(opt.label || opt.name)\n\n            return $group.append($label)\n        },\n\n        renderOwnFieldContent: function(opt) {\n\n            let content; let $input; let $wrapper; let $output; let $units; let $button; let $nest; let $label\n\n            $label = $('<label/>').text(opt.label)\n\n            switch (opt.type) {\n\n                case 'number':\n\n                    $input = $('<input/>', {\n                        type: 'number',\n                        min: opt.options.min,\n                        max: opt.options.max,\n                        step: opt.options.step\n                    }).val(opt.value)\n\n                    content = [$label, $('<div/>').addClass('input-wrapper').append($input)]\n                    break\n\n                case 'range':\n\n                    $label.addClass('with-output')\n                    $output = $('<output/>').text(opt.value)\n                    $units = $('<span/>').addClass('units').text(opt.options.unit)\n                    $input = $('<input/>', {\n                        type: 'range',\n                        name: opt.type,\n                        min: opt.options.min,\n                        max: opt.options.max,\n                        step: opt.options.step\n                    }).val(opt.value)\n\n                    $input.on('change input', function() {\n                        $output.text($input.val())\n                    })\n\n                    content = [$label, $output, $units, $input]\n                    break\n\n                case 'textarea':\n\n                    $input = $('<textarea/>').text(opt.value)\n\n                    content = [$label, $('<div/>').addClass('input-wrapper').append($input)]\n                    break\n\n                case 'content-editable':\n\n                    // replace new lines characters with new lines tags\n                    // and white spaces with non-breaking space\n                    var editableContent = joint.util.isString(opt.value)\n                        ? opt.value.replace(/\\n/g,'<br>').replace(/ /g, '&nbsp;')\n                        : ''\n\n                    $input = $('<div/>')\n                        .prop('contenteditable', true)\n                        .css('display', 'inline-block') // Chrome would use <div> instead of <p> for the new line otherwise.\n                        .html(editableContent)\n                        .on('blur', this.onContentEditableBlur)\n\n                    content = [$label, $('<div/>').addClass('input-wrapper').append($input)]\n                    break\n\n                case 'select':\n\n                    var {items} = opt.options\n                    $input = $('<select/>')\n\n                    if (opt.options.multiple) {\n                        // multiple select allows specify via `size` number of items\n                        // to be displayed in the scrollable list.\n                        $input.prop({\n                            size: opt.options.size || items.length,\n                            multiple: true\n                        })\n                    }\n\n                    var selected = function(itemValue) {\n\n                        if (opt.options.multiple) {\n                            return joint.util.toArray(opt.value).find(function(val) {\n                                return joint.util.isEqual(itemValue, val)\n                            })\n                        }\n                        return joint.util.isEqual(itemValue, opt.value)\n\n                    }\n\n                    joint.util.toArray(items).forEach(function(item) {\n\n                        const $option = $('<option/>', { value: item.value }).text(item.content)\n\n                        if (selected(item.value)) {\n                            $option.attr('selected', 'selected')\n                        }\n\n                        $input.append($option)\n                    })\n\n                    content = [$label, $input]\n                    break\n\n                case 'toggle':\n\n                    $button = $('<span><i/></span>')\n                    $input = $('<input/>', { type: 'checkbox' }).prop('checked', !!opt.value)\n                    $wrapper = $('<div/>').addClass(opt.type)\n\n                    content = [$label, $wrapper.append($input, $button)]\n                    break\n\n                case 'color':\n\n                    $input = $('<input/>', { type: 'color' }).val(opt.value)\n\n                    content = [$label, $input]\n                    break\n\n                case 'text':\n\n                    $input = $('<input/>', { type: 'text' }).val(opt.value)\n\n                    content = [$label, $('<div/>').addClass('input-wrapper').append($input)]\n                    break\n\n                case 'object':\n\n                    $input = $('<div/>')\n                    $nest = $('<div/>').addClass('object-properties')\n\n                    content = [$label, $input.append($nest)]\n                    break\n\n                case 'list':\n\n                    $button = $('<button/>').addClass('btn-list-add').text(opt.options.addButtonLabel || '+')\n                    $nest = $('<div/>').addClass('list-items')\n                    $input = $('<div/>')\n                    content = [$label, $input.append($button, $nest)]\n                    break\n            }\n\n            if ($input) {\n                $input.addClass(opt.type).attr({\n                    'data-type': opt.type,\n                    'data-attribute': opt.attribute,\n                    'data-overwrite': opt.overwrite\n                })\n            }\n\n            // A little trick how to convert an array of jQuery elements\n            // to a jQuery object.\n            return $.fn.append.apply($('<div>'), content).children()\n        },\n\n        onContentEditableBlur: function(evt) {\n\n            // Workaround for Webkit content editable focus bug\n            // https://gist.github.com/shimondoodkin/1081133\n\n            const $editableFix = $('<input/>', {\n                disabled: true,\n                tabIndex: -1,\n                style: {\n                    width: '1px',\n                    height: '1px',\n                    border: 'none',\n                    margin: 0,\n                    padding: 0\n                }\n            }).appendTo(this.$el)\n\n            $editableFix.focus()\n            $editableFix[0].setSelectionRange(0, 0)\n            $editableFix.blur().remove()\n\n            $(evt.target).trigger('change')\n        },\n\n        replaceHTMLEntity: function(entity, code) {\n\n            return this.HTMLEntities[code] || ''\n        },\n\n        renderObjectProperty: function(opt) {\n\n            opt = opt || {}\n\n            const $objectProperty = $('<div/>', {\n                'data-property': opt.property,\n                class: 'object-property'\n            })\n\n            return $objectProperty\n        },\n\n        renderListItem: function(opt) {\n\n            opt = opt || {}\n\n            const $button = $('<button/>').addClass('btn-list-del').text(opt.options.removeButtonLabel || '-')\n            const $listItem = $('<div/>', {\n                'data-index': opt.index,\n                class: 'list-item'\n            })\n\n            return $listItem.append($button)\n        },\n\n        renderFieldContainer: function(opt) {\n\n            opt = opt || {}\n\n            const $field = $('<div/>', {\n                'data-field': opt.path,\n                class: `field ${  opt.type  }-field`\n            })\n\n            return $field\n        },\n\n        renderTemplate: function($el, options, path, opt) {\n\n            $el = $el || this.$el\n            opt = opt || {}\n\n            this.resolveBindings(options)\n\n            // Wrap the input into a `.field` classed element so that we can easilly hide and show\n            // the entire block.\n            const $field = this.renderFieldContainer({ path: path, type: options.type })\n\n            if (options.when && !this.isExpressionValid(options.when)) {\n                $field.addClass('hidden')\n                if (options.when.otherwise) {\n                    if (options.when.otherwise.unset) this.unsetProperty(path)\n                }\n            }\n\n            const value = this.getCellAttributeValue(path, options)\n            const $input = this.renderFieldContent(options, path, value)\n\n            $field.append($input)\n\n            // `options.attrs` allows for setting arbitrary attributes on the generated HTML.\n            // This object is of the form: `<selector> : { <attributeName> : <attributeValue>, ... }`\n            joint.util.setAttributesBySelector($field, options.attrs)\n\n            if (options.type === 'list') {\n\n                joint.util.toArray(value).forEach(function(itemValue, idx) {\n\n                    const $listItem = this.renderListItem({ index: idx, options: options })\n\n                    this.renderTemplate($listItem, options.item, `${path  }/${  idx}`)\n                    $input.children('.list-items').append($listItem)\n\n                }, this)\n\n            } else if (options.type === 'object') {\n\n                options.flatAttributes = this.flattenInputs(options.properties)\n\n                let attributesArray = Object.keys(options.flatAttributes).map(function(path) {\n                    const options = this[path]\n                    options.path = path\n                    return options\n                }, options.flatAttributes)\n                // Sort the attributes by `index` and assign the `path` to the `options` object\n                // so that we can acess it later.\n                attributesArray = util.sortBy(attributesArray, function(options) {\n\n                    return options.index\n                })\n\n                attributesArray.forEach(function(propertyOptions) {\n\n                    const $objectProperty = this.renderObjectProperty({ property: propertyOptions.path })\n\n                    this.renderTemplate($objectProperty, propertyOptions, `${path  }/${  propertyOptions.path}`)\n\n                    $input.children('.object-properties').append($objectProperty)\n\n                }, this)\n            }\n\n            if (opt.replace) {\n\n                $el.find(`[data-field=\"${  path  }\"]`).replaceWith($field)\n\n            } else {\n\n                $el.append($field)\n            }\n        },\n\n        updateInputPosition: function() {\n\n            const $inputX = this._byPath['position/x']\n            const $inputY = this._byPath['position/y']\n\n            const position = this.getModel().get('position')\n\n            if ($inputX) {\n                $inputX.val(position.x)\n            }\n            if ($inputY) {\n                $inputY.val(position.y)\n            }\n        },\n\n        updateInputSize: function() {\n\n            const $inputWidth = this._byPath['size/width']\n            const $inputHeight = this._byPath['size/height']\n\n            const size = this.getModel().get('size')\n\n            if ($inputWidth) {\n                $inputWidth.val(size.width)\n            }\n            if ($inputHeight) {\n                $inputHeight.val(size.height)\n            }\n        },\n\n        updateInputAngle: function() {\n\n            const $inputAngle = this._byPath.angle\n\n            const angle = this.getModel().get('angle')\n\n            if ($inputAngle) {\n                $inputAngle.val(angle)\n            }\n        },\n\n        validateInput: function(type, input, path) {\n\n            // It is assumed custom widgets have their own validation setup.\n            switch (type) {\n\n                case 'select-box':\n                case 'color-palette':\n                    var widget = this.widgets[path]\n                    if (!widget) return false\n                    return widget.getSelectionIndex() !== -1\n                case 'select-button-group':\n                    return !!this.widgets[path]\n                default:\n                    return this.options.validateInput(input, path, type)\n            }\n        },\n\n        onChangeInput: function(evt) {\n\n            if (evt.target === evt.currentTarget) {\n                this.processInput($(evt.target))\n            }\n        },\n\n        processInput: function($input, opt) {\n\n            const path = $input.attr('data-attribute')\n            const type = $input.attr('data-type')\n\n            if (!this.validateInput(type, $input[0], path)) {\n                // The input value is not valid. Do nothing.\n                return\n            }\n\n            if (this.options.live) {\n                this.updateCell($input, path, opt)\n            }\n\n            const rawValue = this.getFieldValue($input[0], type)\n            const value = this.parse(type, rawValue, $input[0])\n\n            // Notify the outside world that an input has changed.\n            this.trigger(`change:${  path}`, value, $input[0], opt)\n        },\n\n        updateDependants: function(path) {\n\n            // Go through all the inputs that are dependent on the value of the changed input.\n            // Show them if the 'when' expression is evaluated to 'true'. Hide them otherwise.\n            joint.util.toArray(this._when[path]).forEach(function(dependant) {\n\n                const $attribute = this._byPath[dependant.path]\n                const $field = $attribute.closest('.field')\n                const previouslyHidden = $field.hasClass('hidden')\n\n                const valid = this.isExpressionValid(dependant.expression)\n\n                $field.toggleClass('hidden', !valid)\n\n                if (dependant.expression.otherwise) {\n                    // unset option - works only with 'live' inspector.\n                    if (dependant.expression.otherwise.unset && this.options.live) {\n\n                        if (!valid) {\n\n                            // When an attribute is hidden in the inspector unset its value in the model.\n                            this.unsetProperty(dependant.path)\n                            this.renderTemplate(null, this.flatAttributes[dependant.path], dependant.path, { replace: true })\n                            this.afterRender()\n\n                        } else if (previouslyHidden) {\n\n                            // The attribute just switched from hidden to visible. We set its value\n                            // to the cell again in case it was unset earlier.\n                            this.updateCell($attribute, dependant.path)\n                        }\n                    }\n                }\n\n            }, this)\n        },\n\n        // unset a model property\n        unsetProperty: function(path, opt) {\n\n            const cell = this.getModel()\n            const pathArray = path.split('/')\n            const attribute = pathArray[0]\n            const nestedAttrPath = pathArray.slice(1).join('/')\n\n            opt = opt || {}\n            opt.inspector = this.cid\n            opt[`inspector_${  this.cid}`] = true // kept for backwards compatibility\n\n            if (path == 'attrs') {\n                // Unsetting an attrs property requires to re-render the view. The cell.removeAttr() does\n                // it for us.\n                cell.removeAttr(nestedAttrPath, opt)\n            } else if (path == attribute) {\n                // Unsetting a primitive object. Fast path.\n                cell.unset(attribute, opt)\n            } else {\n                // Unsetting a nested property.\n                const oldAttrValue = joint.util.merge({}, cell.get(attribute))\n                const newAttrValue = joint.util.unsetByPath(oldAttrValue, nestedAttrPath, '/')\n                cell.set(attribute, newAttrValue, opt)\n            }\n        },\n\n        getOptions: function($attribute) {\n\n            if ($attribute.length === 0) return undefined\n\n            const path = $attribute.attr('data-attribute')\n            let options = this.flatAttributes[path]\n            if (!options) {\n                const $parentAttribute = $attribute.parent().closest('[data-attribute]')\n                const parentPath = $parentAttribute.attr('data-attribute')\n                options = this.getOptions($parentAttribute)\n                const childPath = path.replace(`${parentPath  }/`, '')\n                const parent = options\n                options = parent.item || parent.flatAttributes[childPath]\n                options.parent = parent\n            }\n            return options\n        },\n\n        markForRemoval: function(path, storage) {\n\n            const listPath = this.findParentListByPath(path)\n\n            if (listPath) {\n                const itemPath = path.substr(listPath.length + 1)\n                const index = parseInt(itemPath, 10)\n\n                if (Number.isFinite(index)) {\n\n                    storage.remove[listPath] = storage.remove[listPath] || []\n                    if (!storage.remove[listPath].includes(index)) {\n                        storage.remove[listPath].push(index)\n                    }\n                }\n            }\n        },\n\n        markForUpdate: function(path, storage, value, listPath) {\n\n            const itemPath = path.substr(listPath.length + 1)\n            if (storage.update[listPath]) {\n                joint.util.setByPath(storage.update[listPath].value, itemPath, value, '/')\n            }\n        },\n\n        updateCell: function($attr, attrPath, opt) {\n\n            const cell = this.getModel()\n\n            let byPath = {}\n\n            if ($attr) {\n                // We are updating only one specific attribute\n                byPath[attrPath] = $attr\n            } else {\n                // No parameters given. We are updating all attributes\n                byPath = this._byPath\n            }\n\n            this.startBatchCommand()\n\n            const valuesByPath = {}\n\n            const listChanges = {\n                update: {},\n                remove: {}\n            }\n\n            joint.util.forIn(byPath, function($attribute, path) {\n\n                if ($attribute.closest('.field').hasClass('hidden')) return\n\n                const type = $attribute.attr('data-type')\n                const overwriteAttr = $attribute.attr('data-overwrite')\n                const overwrite = overwriteAttr !== 'false' && overwriteAttr !== undefined\n                const isAdeptForRemoval = $attribute.hasClass('remove')\n\n                switch (type) {\n\n                    case 'list':\n\n                        // Do not empty the list (and trigger change event) if we have at\n                        // least one item in the list. It is not only desirable but necessary.\n                        // An example is when an element has ports. If we emptied the list\n                        // and then reconstructed it again, all the links connected to the ports\n                        // will get lost as the element with ports will think the ports disappeared\n                        // first.\n                        if (isAdeptForRemoval) {\n                            this.markForRemoval(path, listChanges)\n                        }\n                        break\n\n                    case 'object':\n                        // For objects, all is handled in the actual inputs.\n                        if (isAdeptForRemoval) {\n                            this.markForRemoval(path, listChanges)\n                        }\n                        break\n\n                    default:\n\n                        if (!this.validateInput(type, $attribute[0], path)) return\n\n                        var rawValue = this.getFieldValue($attribute[0], type)\n                        var value = this.parse(type, rawValue, $attribute[0])\n                        var options = this.getOptionsFromPath(path)\n\n                        if (options.valueRegExp) {\n                            const oldValue = joint.util.getByPath(cell.attributes, path, '/') || options.defaultValue\n                            value = oldValue.replace(new RegExp(options.valueRegExp), `$1${  value  }$3`)\n                        }\n\n                        if (isAdeptForRemoval) {\n                            this.markForRemoval(path, listChanges)\n                        } else {\n                            const {parent} = options\n                            if (parent && parent.type === 'object' && parent.overwrite !== undefined && parent.overwrite !== false) {\n\n                                const objectValue = {}\n                                const pathArr = path.split('/')\n                                const key = pathArr[pathArr.length - 1]\n                                objectValue[key] = value\n\n                                listChanges.update[parent.path] = {\n                                    value: objectValue,\n                                    overwrite: true\n                                }\n\n                            } else {\n                                valuesByPath[path] = { value: value, overwrite: overwrite }\n                            }\n                        }\n                        break\n                }\n\n            }.bind(this))\n\n            // Set all the values on the model.\n            joint.util.forIn(valuesByPath, function(val, path) {\n                this.setProperty(path, val.value, joint.util.assign({ overwrite: val.overwrite }, opt))\n                this.updateBindings(path)\n                this.updateDependants(path)\n            }.bind(this))\n\n            // Set all the arrays with all its items on the model now.\n            joint.util.forIn(listChanges.remove, function(indexes, list) {\n                this.removeProperty(list, indexes, joint.util.assign({ rewrite: true }, opt))\n            }.bind(this))\n\n            joint.util.forIn(listChanges.update, function(items, list) {\n\n                this.setProperty(list, this.compactDeep(items.value), joint.util.assign({\n                    rewrite: true,\n                    overwrite: items.overwrite\n                }, opt))\n\n                this.updateBindings(list)\n                this.updateDependants(list)\n            }.bind(this))\n\n            this.updateGroupsVisibility()\n            this.stopBatchCommand()\n        },\n\n        compactDeep: function(items) {\n\n            if (Array.isArray(items)) {\n                return items.reduce(function(res, item) {\n                    if (item) {\n                        res.push(this.compactDeep(item))\n                    }\n                    return res\n                }.bind(this), [])\n            }\n\n            return items\n        },\n\n        // Find the first list on the given path (exclude the list determined by the path itself).\n        // @return path\n        findParentListByPath: function(path) {\n\n            const pathArray = path.split('/')\n\n            pathArray.pop()\n\n            const inputsPathArray = pathArray.map(function(part) {\n                return Number.isNaN(parseInt(part)) ? part : 'item'\n            })\n\n            const options = this.options.inputs\n\n            while (inputsPathArray.length) {\n\n                const inputOptions = util.getByPath(options, inputsPathArray)\n                if (inputOptions && inputOptions.type === 'list') {\n                    return pathArray.slice(0, inputsPathArray.length).join('/')\n                }\n\n                inputsPathArray.pop()\n            }\n\n            return null\n        },\n\n        getOptionsFromPath: function(path) {\n\n            const pathArray = path.split('/')\n\n            let options = this.expandAttributes\n            let parent\n            const parentPath = []\n\n            while (pathArray.length) {\n\n                var part\n                var partPrev = part\n\n                if (options && options.type === 'object') {\n                    part = 'properties'\n                } else {\n                    part = pathArray.shift()\n                    if (pathArray.length || options.type === 'list') {\n                        parent = options\n                        parentPath.push(part)\n                    }\n                }\n\n                part = Number.isNaN(parseInt(part)) ? part : 'item'\n\n                if (Object(options) === options && (part in options || options[path])) {\n                    options = options[part] || options[path]\n                } else {\n                    return undefined\n                }\n            }\n\n            options = util.assign({}, options)\n            parent = util.assign({}, parent)\n\n            parent.path = parentPath.join('/')\n            if (partPrev && partPrev === 'properties') {\n                parent.type = 'object'\n            }\n\n            options.parent = parent\n            return options\n        },\n\n        getFieldValue: function(attribute, type) {\n\n            if (joint.util.isFunction(this.options.getFieldValue)) {\n\n                const fieldValue = this.options.getFieldValue(attribute, type)\n                if (fieldValue) {\n                    return fieldValue.value\n                }\n            }\n\n            const $attribute = $(attribute)\n\n            switch (type) {\n                case 'select-box':\n                case 'color-palette':\n                case 'select-button-group':\n                    var path = $attribute.attr('data-attribute')\n                    return this.widgets[path].getSelectionValue()\n                case 'content-editable':\n                    return $attribute.html()\n                        .replace(/<br(\\s*)\\/*>/ig, '\\n') // replace single line-breaks\n                        .replace(/<[p|div]\\s/ig, '\\n$0') // add a line break before all div and p tags\n                        .replace(/(<([^>]+)>)/ig, '')    // remove any remaining tags\n                        .replace(/&(\\w+);/ig, this.replaceHTMLEntity) // replace html entities with a plain text\n                        .replace(/\\n$/, '')             // remove the last line-break\n                default:\n                    return $attribute.val()\n            }\n        },\n\n        removeProperty: function(path, indexes, opt) {\n\n            const model = this.getModel()\n            const {prop} = joint.dia.Cell.prototype\n\n            const current = prop.call(model, path)\n            if (!current) {\n                // this is usual when live == false\n                return\n            }\n\n            let updated = current.reduce(function(res, item, i) {\n                if (!indexes.includes(i)) {\n                    res.push(item)\n                }\n                return res\n            }, [])\n\n            const isTopLevelAttr = this.flatAttributes[path]\n            if (Array.isArray(updated) && updated.length === 0 && !isTopLevelAttr) {\n                updated = null\n            }\n\n            prop.call(model, path, updated, opt)\n\n            const parentList = this.findParentListByPath(path)\n\n            // compact parrent list\n            if (parentList) {\n                const currentParent = prop.call(model, parentList)\n                prop.call(model, parentList, this.compactDeep(currentParent), { rewrite: true })\n            }\n        },\n\n        setProperty: function(path, value, opt) {\n\n            opt = opt || {}\n            opt.inspector = this.cid\n\n            // The model doesn't have to be a JointJS cell necessarily. It could be\n            // an ordinary Backbone.Model and such would have no method 'prop'.\n            const {prop} = joint.dia.Cell.prototype\n            const model = this.getModel()\n            const overwrite = opt.overwrite || false\n\n            if (opt.previewDone) {\n                // If we're finished with the preview mode, first set silently the model property to the value\n                // before the preview mode has started. This is because we want the outside application\n                // to be able to handle the end of the preview (useful when you don't want to\n                // store value changes caused by preview to a DB but only want to store the\n                // final value after the preview mode has finished).\n                prop.call(model, path, opt.originalValue, { rewrite: true, silent: true })\n            }\n\n            if (value === undefined) {\n\n                // Method prop can't handle undefined values in right way.\n                // The model attributes would stay untouched if try to\n                // set a nested property to undefined.\n                joint.dia.Cell.prototype.removeProp.call(model, path, opt)\n\n            } else {\n\n                let updated\n\n                if (joint.util.isObject(value) && !overwrite) {\n                    const current = prop.call(model, path)\n                    const targetType = Array.isArray(value) ? [] : {}\n                    updated = joint.util.merge(targetType, current, value)\n                } else {\n                    updated = joint.util.clone(value)\n                }\n\n                if (overwrite) opt.rewrite = true\n                prop.call(model, path, updated, opt)\n            }\n        },\n\n        // Parse the input `value` based on the input `type`.\n        // Override this method if you need your own specific parsing.\n        parse: function(type, value, targetElement) {\n\n            switch (type) {\n                case 'number':\n                case 'range':\n                    value = parseFloat(value)\n                    break\n                case 'toggle':\n                    value = targetElement.checked\n                    break\n            }\n\n            return value\n        },\n\n        startBatchCommand: function() {\n\n            if (!this.inBatch) {\n                this.inBatch = true\n                this.getModel().startBatch('inspector', { cid: this.cid })\n            }\n        },\n\n        stopBatchCommand: function() {\n\n            if (this.inBatch) {\n                this.getModel().stopBatch('inspector', { cid: this.cid })\n                this.inBatch = false\n            }\n        },\n\n        afterRender: function() {\n            this.cacheInputs()\n            this.updateGroupsVisibility()\n            this.trigger('render')\n        },\n\n        addListItem: function(evt) {\n\n            const $target = $(evt.target)\n            const $attribute = $target.closest('[data-attribute]')\n            const path = $attribute.attr('data-attribute')\n            const options = this.getOptions($attribute)\n\n            // Take the index of the last list item and increase it by one.\n            const $lastListItem = $attribute.children('.list-items').children('.list-item').last()\n            const lastIndex = $lastListItem.length === 0 ? -1 : parseInt($lastListItem.attr('data-index'), 10)\n            const index = lastIndex + 1\n\n            const $listItem = this.renderListItem({ index: index, options: options })\n\n            this.renderTemplate($listItem, options.item, `${path  }/${  index}`)\n\n            $target.parent().children('.list-items').append($listItem)\n            $listItem.find('input:first').focus()\n\n            this.afterRender()\n\n            if (this.options.live) {\n                this.updateCell()\n            }\n        },\n\n        deleteListItem: function(evt) {\n\n            const $listItem = $(evt.target).closest('.list-item')\n\n            $listItem.hide()\n            $listItem.addClass('remove')\n            // Find all the nested inputs and update their path so that it contains the new index.\n            $listItem.find('[data-field]').each(function() {\n                $(this).hide().addClass('remove')\n            })\n\n            // Find all the nested inputs and update their path so that it contains the new index.\n            $listItem.find('[data-attribute]').each(function() {\n                $(this).hide().addClass('remove')\n            })\n\n            this.afterRender()\n\n            if (this.options.live) {\n                this.updateCell()\n            }\n        },\n\n        bindDocumentEvents: function() {\n            const ns = this.getEventNamespace()\n            this.$document.on(`mouseup${  ns  } touchend${  ns}`, this.pointerup)\n        },\n\n        unbindDocumentEvents: function() {\n            this.$document.off(this.getEventNamespace())\n        },\n\n        pointerdown: function(evt) {\n            this.bindDocumentEvents()\n            this.startBatchCommand()\n            this._$activeField = $(evt.currentTarget).addClass('is-in-action')\n        },\n\n        pointerup: function() {\n            this.unbindDocumentEvents()\n            // Start a batch command on `mousedown` over the inspector and stop it when the mouse is\n            // released anywhere in the document. This prevents setting attributes in tiny steps\n            // when e.g. a value is being adjusted through a slider. This gives other parts\n            // of the application a chance to treat the serveral little changes as one change.\n            // Consider e.g. the CommandManager plugin.\n            this.stopBatchCommand()\n\n            if (this._$activeField) {\n                this._$activeField.removeClass('is-in-action')\n                this._$activeField = null\n            }\n        },\n\n        pointerfocusin: function(evt) {\n            evt.stopPropagation()\n            $(evt.currentTarget).addClass('is-focused')\n        },\n\n        pointerfocusout: function(evt) {\n            evt.stopPropagation()\n            $(evt.currentTarget).removeClass('is-focused')\n        },\n\n        onRemove: function() {\n\n            this.unbindDocumentEvents()\n            this.removeWidgets()\n            if (this === this.constructor.instance) {\n                this.constructor.instance = null\n            }\n        },\n\n        removeWidgets: function() {\n\n            const {widgets} = this\n            for (const path in widgets) {\n                widgets[path].remove()\n            }\n\n            this.widgets = {}\n        },\n\n        onGroupLabelClick: function(evt) {\n\n            // Prevent default action for iPad not to handle this event twice.\n            evt.preventDefault()\n\n            if (!this.options.multiOpenGroups) {\n                this.closeGroups()\n            }\n\n            const $group = $(evt.target).closest('.group')\n            this.toggleGroup($group)\n        },\n\n        toggleGroup: function(name) {\n\n            const $group = joint.util.isString(name) ? this.$(`.group[data-name=\"${  name  }\"]`) : $(name)\n\n            if ($group.hasClass('closed')) {\n                this.openGroup($group)\n            } else {\n                this.closeGroup($group)\n            }\n        },\n\n        closeGroup: function(name, opt) {\n\n            opt = opt || {}\n            const $group = joint.util.isString(name) ? this.$(`.group[data-name=\"${  name  }\"]`) : $(name)\n\n            if (opt.init || !$group.hasClass('closed')) {\n                $group.addClass('closed')\n                this.trigger('group:close', $group.data('name'), opt)\n            }\n        },\n\n        openGroup: function(name, opt) {\n\n            opt = opt || {}\n            const $group = joint.util.isString(name) ? this.$(`.group[data-name=\"${  name  }\"]`) : $(name)\n\n            if (opt.init || $group.hasClass('closed')) {\n                $group.removeClass('closed')\n                this.trigger('group:open', $group.data('name'), opt)\n            }\n        },\n\n        closeGroups: function() {\n\n            for (let i = 0, n = this.$groups.length; i < n; i++) {\n                this.closeGroup(this.$groups[i])\n            }\n        },\n\n        openGroups: function() {\n\n            for (let i = 0, n = this.$groups.length; i < n; i++) {\n                this.openGroup(this.$groups[i])\n            }\n        },\n\n        // Expressions\n\n        COMPOSITE_OPERATORS: ['not', 'and', 'or', 'nor'],\n        PRIMITIVE_OPERATORS: ['eq', 'ne', 'regex', 'text', 'lt', 'lte', 'gt', 'gte', 'in', 'nin', 'equal'],\n\n        _isComposite: function(expr) {\n\n            return util.intersection(this.COMPOSITE_OPERATORS, Object.keys(expr)).length > 0\n        },\n\n        _isPrimitive: function(expr) {\n\n            const operators = Object.keys(this.options.operators).concat(this.PRIMITIVE_OPERATORS)\n            return util.intersection(operators, Object.keys(expr)).length > 0\n        },\n\n        _evalCustomPrimitive: function(name, value, args) {\n\n            // Operator signature --> function(cell, value, argument*) {}\n            return !!this.options.operators[name].apply(this, [this.getModel(), value].concat(args))\n        },\n\n        _evalPrimitive: function(expr) {\n\n            return Object.keys(expr).reduce(function(res, operator) {\n                const condition = expr[operator]\n\n                return Object.keys(condition).reduce(function(res, condPath) {\n                    const condValue = condition[condPath]\n                    const val = this.getCellAttributeValue(condPath)\n\n                    // Let's check if this is a custom operator.\n                    if (joint.util.isFunction(this.options.operators[operator])) {\n                        // Note that custom operators can replace the existing primitives.\n                        return this._evalCustomPrimitive(operator, val, condValue)\n                    }\n\n                    switch (operator) {\n                        case 'eq':\n                            return condValue == val\n                        case 'ne':\n                            return condValue != val\n                        case 'regex':\n                            return (new RegExp(condValue)).test(val)\n                        case 'text':\n                            return !condValue || (joint.util.isString(val) && val.toLowerCase().indexOf(condValue) > -1)\n                        case 'lt':\n                            return val < condValue\n                        case 'lte':\n                            return val <= condValue\n                        case 'gt':\n                            return val > condValue\n                        case 'gte':\n                            return val >= condValue\n                        case 'in':\n                            return Array.isArray(condValue) && condValue.includes(val)\n                        case 'nin':\n                            return Array.isArray(condValue) && !condValue.includes(val)\n                        case 'equal':\n                            return joint.util.isEqual(condValue, val)\n                        default:\n                            return res\n                    }\n\n                }.bind(this), false)\n            }.bind(this), false)\n        },\n\n        _evalExpression: function(expr) {\n\n            if (this._isPrimitive(expr)) {\n                return this._evalPrimitive(expr)\n            }\n\n            return Object.keys(expr).reduce(function(res, operator) {\n\n                const childExpr = expr[operator]\n\n                if (operator == 'not') return !this._evalExpression(childExpr)\n\n                const childExprRes = util.toArray(childExpr).map(this._evalExpression, this)\n\n                switch (operator) {\n                    case 'and':\n                        return childExprRes.every(function(e) {\n                            return !!e\n                        })\n                    case 'or':\n                        return childExprRes.some(function(e) {\n                            return !!e\n                        })\n                    case 'nor':\n                        return !childExprRes.some(function(e) {\n                            return !!e\n                        })\n                    default:\n                        return res\n                }\n\n            }.bind(this), false)\n        },\n\n        _extractVariables: function(expr) {\n\n            if (Array.isArray(expr) || this._isComposite(expr)) {\n\n                return util.toArray(expr).reduce(function(res, childExpr) {\n                    return res.concat(this._extractVariables(childExpr))\n                }.bind(this), [])\n            }\n\n            return util.toArray(expr).reduce(function(res, primitive) {\n                return Object.keys(primitive)\n            }, [])\n        },\n\n        isExpressionValid: function(expr) {\n            expr = joint.util.omit(expr, 'otherwise', 'dependencies')\n            return this._evalExpression(expr)\n        },\n\n        extractExpressionPaths: function(expr) {\n\n            // Additional dependencies can be defined. Useful when we using custom operators and\n            // we want the input to be displayed/showed also if this dependency change.\n            const dependencies = (expr && expr.dependencies) || []\n\n            // All other dependencies are already in the expression definition.\n            expr = util.omit(expr, 'otherwise', 'dependencies')\n            return util.uniq(this._extractVariables(expr).concat(dependencies))\n        },\n\n        /**\n         * @private\n         * @returns {string}\n         */\n        getGroupsStateKey: function() {\n\n            if (joint.util.isFunction(this.options.stateKey)) {\n                return this.options.stateKey(this.getModel())\n            }\n\n            throw new Error('Inspector: Option stateKey must be a function')\n        },\n\n        /**\n         * @public\n         * store the current state of groups.\n         */\n        storeGroupsState: function() {\n\n            const key = this.getGroupsStateKey()\n            const closedGroups = util.toArray(this.$('.group.closed'))\n\n            joint.ui.Inspector.groupStates[key] = closedGroups.map(function(g) {\n                return $(g).attr('data-name')\n            })\n        },\n\n        /**\n         * @public\n         * get groups which are actually stored as closed in state. This could differ from currently rendered state.\n         * @returns {Array.<string>}\n         */\n        getGroupsState: function() {\n\n            return joint.ui.Inspector.groupStates[this.getGroupsStateKey()]\n        },\n\n        /**\n         * @public\n         * Opens/closes groups regards to the stored state.\n         */\n        restoreGroupsState: function() {\n\n            const processGroups = function(isClosed, context) {\n                joint.util.forIn(context.options.groups, function(group, groupName) {\n                    isClosed(group, groupName) ? this.closeGroup(groupName) : this.openGroup(groupName)\n                }.bind(context))\n            }\n\n            const key = this.getGroupsStateKey()\n\n            if (joint.ui.Inspector.groupStates[key]) {\n                processGroups(function(group, groupName) {\n                    return joint.ui.Inspector.groupStates[key].includes(groupName)\n                }, this)\n            } else {\n                processGroups(function(group) {\n                    return group.closed\n                }, this)\n            }\n        }\n\n    }, {\n\n        /** @type {Object.<string, Array.<string>>} */\n        groupStates: {},\n\n        /** @type joint.ui.Inspector */\n        instance: null,\n\n        /**\n         * @param {Element|string} container Element or selector\n         * @param {Object} opt Inspector options\n         * @returns {joint.ui.Inspector}\n         */\n        create: function(container, opt) {\n\n            opt = opt || {}\n            joint.util.defaults(opt, {\n                restoreGroupsState: true,\n                storeGroupsState: true\n            })\n\n            const cell = opt.cell || opt.cellView.model\n            let inspector = this.instance\n\n            // No need to re-render inspector if the cellView didn't change.\n            if (!inspector || inspector.options.cell !== cell) {\n\n                // Is there an inspector that has not been removed yet.\n                // Note that an inspector can be also removed when the underlying cell is removed.\n                if (inspector && inspector.el.parentNode) {\n\n                    if (opt.storeGroupsState) {\n                        inspector.storeGroupsState()\n                    }\n\n                    // Clean up the old inspector.\n                    inspector.updateCell()\n                    inspector.remove()\n                }\n\n                inspector = new this(opt).render()\n                this.instance = inspector\n                $(container).html(inspector.el)\n\n                if (opt.restoreGroupsState) {\n                    inspector.restoreGroupsState()\n                }\n            }\n\n            return inspector\n        },\n\n        close: function() {\n\n            const inspector = this.instance\n            if (inspector) {\n                inspector.remove()\n            }\n        }\n    })\n}(joint, joint.util))\n\njoint.ui.FreeTransform = joint.mvc.View.extend({\n\n    className: 'free-transform',\n\n    events: {\n        'mousedown .resize': 'startResizing',\n        'mousedown .rotate': 'startRotating',\n        'touchstart .resize': 'startResizing',\n        'touchstart .rotate': 'startRotating'\n    },\n\n    DIRECTIONS: ['nw', 'n', 'ne', 'e', 'se', 's', 'sw', 'w'],\n    POSITIONS: ['top-left', 'top', 'top-right', 'right', 'bottom-right', 'bottom', 'bottom-left', 'left'],\n\n    options: {\n        cellView: undefined,\n        rotateAngleGrid: 15,\n        preserveAspectRatio: false,\n        minWidth: 0,\n        minHeight: 0,\n        maxWidth: Infinity,\n        maxHeight: Infinity,\n        allowOrthogonalResize: true,\n        allowRotation: true,\n        clearAll: true,\n        clearOnBlankPointerdown: true\n    },\n\n    init: function() {\n\n        const {options} = this\n        if (options.cellView) {\n            // The freetransform can be initalized by passing a single cellView option or\n            // historically by passing all required references (cell, paper & graph).\n            joint.util.defaults(options, {\n                cell: options.cellView.model,\n                paper: options.cellView.paper,\n                graph: options.cellView.paper.model\n            })\n        }\n\n        joint.util.bindAll(this, 'update', 'remove', 'pointerup', 'pointermove')\n\n        const {paper} = options\n        const {graph} = options\n\n        if (options.clearAll) {\n            // Remove any existing freetransforms.\n            this.constructor.clear(paper)\n        }\n\n        // Register mouse events.\n        $(document.body).on('mousemove touchmove', this.pointermove)\n        $(document).on('mouseup touchend', this.pointerup)\n\n        // Update the freeTransform when the graph is changed.\n        this.listenTo(graph, 'all', this.update)\n        this.listenTo(paper, 'scale translate', this.update)\n\n        // Remove the freeTransform when the model is removed.\n        this.listenTo(graph, 'reset', this.remove)\n        this.listenTo(options.cell, 'remove', this.remove)\n\n        if (options.clearOnBlankPointerdown) {\n            // Hide the freeTransform when the user clicks anywhere in the paper\n            this.listenTo(paper, 'blank:pointerdown', this.remove)\n        }\n\n        paper.$el.append(this.el)\n\n        // Register this freetransform instance.\n        this.constructor.registerInstanceToPaper(this, paper)\n    },\n\n    renderHandles: function() {\n\n        const $handleTemplate = $('<div/>').prop('draggable', false)\n        const $rotateHandle = $handleTemplate.clone().addClass('rotate')\n        const $resizeHandles = this.POSITIONS.map(function(position) {\n            return $handleTemplate.clone().addClass('resize').attr('data-position', position)\n        })\n\n        this.$el.empty().append($resizeHandles, $rotateHandle)\n    },\n\n    render: function() {\n\n        this.renderHandles()\n\n        // We have to use `attr` as jQuery `data` doesn't update DOM\n        this.$el.attr('data-type', this.options.cell.get('type'))\n\n        // Note that preserve aspect ratio option enabled implicates no resize handles on the sides.\n        this.$el.toggleClass('no-orthogonal-resize', this.options.preserveAspectRatio || !this.options.allowOrthogonalResize)\n\n        this.$el.toggleClass('no-rotation', !this.options.allowRotation)\n\n        this.update()\n    },\n\n    update: function() {\n\n        const viewportCTM = this.options.paper.matrix()\n\n        const bbox = this.options.cell.getBBox()\n\n        // Calculate the free transform size and position in viewport coordinate system.\n        // TODO: take a viewport rotation in account.\n        bbox.x *= viewportCTM.a\n        bbox.x += viewportCTM.e\n        bbox.y *= viewportCTM.d\n        bbox.y += viewportCTM.f\n        bbox.width *= viewportCTM.a\n        bbox.height *= viewportCTM.d\n\n        const angle = g.normalizeAngle(this.options.cell.get('angle') || 0)\n\n        const transformVal =  `rotate(${  angle  }deg)`\n\n        this.$el.css({\n            width: bbox.width + 4,\n            height: bbox.height + 4,\n            left: bbox.x - 3,\n            top: bbox.y - 3,\n            transform: transformVal,\n            '-webkit-transform': transformVal, // chrome + safari\n            '-ms-transform': transformVal // IE 9\n        })\n\n        // Update the directions on the halo divs while the element being rotated. The directions are represented\n        // by cardinal points (N,S,E,W). For example the div originally pointed to north needs to be changed\n        // to point to south if the element was rotated by 180 degrees.\n        const shift = Math.floor(angle * (this.DIRECTIONS.length / 360))\n\n        if (shift != this._previousDirectionsShift) {\n\n            // Create the current directions array based on the calculated shift.\n            const directions = this.DIRECTIONS.slice(shift).concat(this.DIRECTIONS.slice(0, shift))\n\n            // Apply the array on the halo divs.\n            this.$('.resize').removeClass(this.DIRECTIONS.join(' ')).each(function(index, el) {\n                $(el).addClass(directions[index])\n            })\n\n            this._previousDirectionsShift = shift\n        }\n    },\n\n    calculateTrueDirection: function(relativeDirection) {\n\n        const {cell} = this.options\n        const normalizedAngle = g.normalizeAngle(cell.get('angle'))\n        let trueDirectionIndex = this.POSITIONS.indexOf(relativeDirection)\n\n        trueDirectionIndex += Math.floor(normalizedAngle * (this.POSITIONS.length / 360))\n        trueDirectionIndex %= this.POSITIONS.length\n\n        return this.POSITIONS[trueDirectionIndex]\n    },\n\n    startResizing: function(evt) {\n\n        evt.stopPropagation()\n\n        this.options.graph.startBatch('free-transform', { freeTransform: this.cid })\n\n        // Target's data attribute can contain one of 8 positions. Each position defines the way how to\n        // resize an element. Whether to change the size on x-axis, on y-axis or on both.\n\n        // The direction relative to itself.\n        const relativeDirection = $(evt.target).data('position')\n        const trueDirection = this.calculateTrueDirection(relativeDirection)\n        let rx = 0\n        let ry = 0\n\n        relativeDirection.split('-').forEach(function(singleDirection) {\n\n            rx = { left: -1, right: 1 }[singleDirection] || rx\n            ry = { top: -1, bottom: 1 }[singleDirection] || ry\n        })\n\n        // The direction has to be one of the 4 directions the element's resize method would accept (TL,BR,BL,TR).\n        const direction = this.toValidResizeDirection(relativeDirection)\n\n        // The selector holds a function name to pick a corner point on a rectangle.\n        // See object `rect` in `src/geometry.js`.\n        const selector = {\n            'top-right': 'bottomLeft',\n            'top-left': 'corner',\n            'bottom-left': 'topRight',\n            'bottom-right': 'origin'\n        }[direction]\n\n        // Expose the initial setup, so `pointermove` method can access it.\n        this._initial = {\n            angle: g.normalizeAngle(this.options.cell.get('angle') || 0),\n            resizeX: rx, // to resize, not to resize or flip coordinates on x-axis (1,0,-1)\n            resizeY: ry, // to resize, not to resize or flip coordinates on y-axis (1,0,-1)\n            selector: selector,\n            direction: direction,\n            relativeDirection: relativeDirection,\n            trueDirection: trueDirection\n        }\n\n        this._action = 'resize'\n\n        this.startOp(evt.target)\n    },\n\n    toValidResizeDirection: function(direction) {\n\n        return {\n            top: 'top-left',\n            bottom: 'bottom-right',\n            left: 'bottom-left',\n            right: 'top-right'\n        }[direction] || direction\n    },\n\n    startRotating: function(evt) {\n\n        evt.stopPropagation()\n\n        this.options.graph.startBatch('free-transform', { freeTransform: this.cid })\n\n        const center = this.options.cell.getBBox().center()\n\n        const clientCoords = this.options.paper.snapToGrid({ x: evt.clientX, y: evt.clientY })\n\n        // Expose the initial setup, so `pointermove` method can acess it.\n        this._initial = {\n            // the centre of the element is the centre of the rotation\n            centerRotation: center,\n            // an angle of the element before the rotating starts\n            modelAngle: g.normalizeAngle(this.options.cell.get('angle') || 0),\n            // an angle between the line starting at mouse coordinates, ending at the center of rotation\n            // and y-axis\n            startAngle: g.point(clientCoords).theta(center)\n        }\n\n        this._action = 'rotate'\n\n        this.startOp(evt.target)\n    },\n\n    pointermove: function(evt) {\n\n        if (!this._action) return\n\n        evt = joint.util.normalizeEvent(evt)\n\n        const {options} = this\n        const clientCoords = options.paper.snapToGrid({ x: evt.clientX, y: evt.clientY })\n        const {gridSize} = options.paper.options\n        const model = options.cell\n        const i = this._initial\n\n        switch (this._action) {\n\n            case 'resize':\n                var currentRect = model.getBBox()\n\n                // The requested element's size has to be find on the unrotated element. Therefore we\n                // are rotating a mouse coordinates back (coimageCoords) by an angle the element is rotated by and\n                // with the center of rotation equals to the center of the unrotated element.\n                var coimageCoords = g.point(clientCoords).rotate(currentRect.center(), i.angle)\n\n                // The requested size is the difference between the fixed point and coimaged coordinates.\n                var requestedSize = coimageCoords.difference(currentRect[i.selector]())\n\n                // Calculate the new dimensions. `resizeX`/`resizeY` can hold a zero value if the resizing\n                // on x-axis/y-axis is not allowed.\n                var width = i.resizeX ? requestedSize.x * i.resizeX : currentRect.width\n                var height = i.resizeY ? requestedSize.y * i.resizeY : currentRect.height\n\n                // Fitting into a grid\n                width = g.snapToGrid(width, gridSize)\n                height = g.snapToGrid(height, gridSize)\n                // Minimum\n                width = Math.max(width, options.minWidth || gridSize)\n                height = Math.max(height, options.minHeight || gridSize)\n                // Maximum\n                width = Math.min(width, options.maxWidth)\n                height = Math.min(height, options.maxHeight)\n\n                if (options.preserveAspectRatio) {\n\n                    const candidateWidth = currentRect.width * height / currentRect.height\n                    const candidateHeight = currentRect.height * width / currentRect.width\n\n                    candidateWidth > width ? (height = candidateHeight) : (width = candidateWidth)\n                }\n\n                // Resize the element only if the dimensions are changed.\n                if (currentRect.width != width || currentRect.height != height) {\n\n                    model.resize(width, height, {\n                        freeTransform: this.cid,\n                        direction: i.direction,\n                        relativeDirection: i.relativeDirection,\n                        trueDirection: i.trueDirection,\n                        ui: true,\n                        // The rest of properties are important for the Snapline plugin.\n                        minWidth: options.minWidth,\n                        minHeight: options.minHeight,\n                        maxWidth: options.maxWidth,\n                        maxHeight: options.maxHeight,\n                        preserveAspectRatio: options.preserveAspectRatio\n                    })\n                }\n                break\n\n            case 'rotate':\n                // Calculate an angle between the line starting at mouse coordinates, ending at the centre\n                // of rotation and y-axis and deduct the angle from the start of rotation.\n                var theta = i.startAngle - g.point(clientCoords).theta(i.centerRotation)\n\n                model.rotate(g.snapToGrid(i.modelAngle + theta, options.rotateAngleGrid), true)\n                break\n        }\n    },\n\n    pointerup: function(evt) {\n\n        if (!this._action) return\n\n        this.stopOp()\n\n        this.options.graph.stopBatch('free-transform', { freeTransform: this.cid })\n\n        this._action = null\n        this._initial = null\n    },\n\n    onRemove: function() {\n\n        $(document.body).off('mousemove touchmove', this.pointermove)\n        $(document).off('mouseup touchend', this.pointerup)\n\n        joint.ui.FreeTransform.unregisterInstanceFromPaper(this, this.options.paper)\n    },\n\n    startOp: function(el) {\n\n        if (el) {\n            // Add a class to the element we are operating with\n            $(el).addClass('in-operation')\n            this._elementOp = el\n        }\n\n        this.$el.addClass('in-operation')\n    },\n\n    stopOp: function() {\n\n        if (this._elementOp) {\n            // Remove a class from the element we were operating with\n            $(this._elementOp).removeClass('in-operation')\n            this._elementOp = null\n        }\n\n        this.$el.removeClass('in-operation')\n    }\n\n}, {\n\n    instancesByPaper: {},\n\n    // Removes all freetransforms from the paper.\n    clear: function(paper) {\n\n        // Keep this for backwards compatibility.\n        paper.trigger('freetransform:create')\n\n        this.removeInstancesForPaper(paper)\n    },\n\n    removeInstancesForPaper: function(paper) {\n\n        joint.util.invoke(this.getInstancesForPaper(paper), 'remove')\n    },\n\n    getInstancesForPaper: function(paper) {\n\n        return this.instancesByPaper[paper.cid] || {}\n    },\n\n    registerInstanceToPaper: function(instance, paper) {\n\n        this.instancesByPaper[paper.cid] || (this.instancesByPaper[paper.cid] = {})\n        this.instancesByPaper[paper.cid][instance.cid] = instance\n    },\n\n    unregisterInstanceFromPaper: function(instance, paper) {\n\n        if (this.instancesByPaper[paper.cid]) {\n            this.instancesByPaper[paper.cid][instance.cid] = null\n        }\n    }\n})\n\njoint.ui.Tooltip = joint.mvc.View.extend({\n\n    className: 'tooltip',\n\n    options: {\n        // `left` allows you to set a selector (or DOM element) that\n        // will be used as the left edge of the tooltip. This is useful when configuring a tooltip\n        // that should be shown \"after\" some other element. Other sides are analogous.\n        /** @deprecated use position: 'left' instead. This value is used when 'position' is not defined. Ignored if defined on element.  */\n        left: undefined,\n        /** @deprecated use position: 'right' instead. This value is used when 'position' is not defined. Ignored if defined on element.  */\n        right: undefined,\n        /** @deprecated use position: 'top' instead. This value is used when 'position' is not defined. Ignored if defined on element. */\n        top: undefined,\n        /** @deprecated use position: 'bottom' instead. This value is used when 'position' is not defined. Ignored if defined on element. */\n        bottom: undefined,\n\n        /** @type {string|function(element)} */\n        position: undefined,\n\n        /** @type {string|function(element)} */\n        positionSelector: undefined,\n\n        /** @type {string|function(element)} Tooltip arrow direction, could be 'left', 'right', 'top', 'bottom' and 'auto'.\n         * 'auto' sets the arrow accordingly 'position' property.\n         * Arrows are disabled if 'direction' is 'undefined', 'null' or 'off'.\n         * */\n        direction: 'auto',\n\n        /**\n         * Minimal width of the tooltip. Tooltip width can be resized down to the `minResizedWidth`. If available space is smaller\n         * than `minResizedWidth`, direction of the tooltip is changed to its opposite direction (left tooltip is swapped to right,\n         * top to bottom and vice versa). `minResizedWidth:0` means no resizing, no direction swapping.\n         * @type {number}\n         */\n        minResizedWidth: 100,\n\n        /** @type {number|function(element)} */\n        padding: 0,\n\n        /** @type {String} */\n        rootTarget: null,\n\n        /** @type {String} */\n        target: null,\n\n        /** @type {string} */\n        trigger: 'hover',\n\n        /** @type {{selector: String, padding: number}} */\n        viewport: {\n            selector: null,\n            padding: 0\n        },\n\n        /** @type {string} */\n        dataAttributePrefix: 'tooltip',\n\n        /** @type {string} */\n        template: '<div class=\"tooltip-arrow\"/><div class=\"tooltip-arrow-mask\"/><div class=\"tooltip-content\"/>'\n    },\n\n    init: function() {\n\n        this.eventNamespace = (`.${  this.className  }${this.cid}`).replace(/ /g, '_')\n\n        /**\n         * Specific for each tooltip - merged global options with tooltip's options from html attrs.\n         * @type {object}\n         */\n        this.settings = {}\n\n        const triggers = this.options.trigger.split(' ')\n\n        joint.util.bindAll(this, 'render', 'hide', 'show', 'toggle', 'isVisible', 'position')\n\n        if (this.options.rootTarget) {\n\n            this.$rootTarget = $(this.options.rootTarget)\n\n            triggers.forEach(function(trigger) {\n\n                switch (trigger) {\n\n                    case 'click':\n                        this.$rootTarget.on(`click${  this.eventNamespace}`, this.options.target, this.toggle)\n                        break\n\n                    case 'hover':\n                        this.$rootTarget.on(`mouseover${  this.eventNamespace}`, this.options.target, this.render)\n                        break\n\n                    case 'focus':\n                        this.$rootTarget.on(`focusin${  this.eventNamespace}`, this.options.target, this.render)\n                        break\n                }\n\n            }, this)\n\n        } else {\n\n            this.$target = $(this.options.target)\n\n            triggers.forEach(function(trigger) {\n\n                switch (trigger) {\n\n                    case 'click':\n                        this.$target.on(`click${  this.eventNamespace}`, this.toggle)\n                        break\n\n                    case 'hover':\n                        this.$target.on(`mouseover${  this.eventNamespace}`, this.render)\n                        break\n\n                    case 'focus':\n                        this.$target.on(`focusin${  this.eventNamespace}`, this.render)\n                        break\n\n                }\n            }, this)\n        }\n\n        this.$el.append(this.options.template)\n    },\n\n    /**\n     * @private\n     */\n    onRemove: function() {\n\n        // Detach events listeners\n        if (this.options.rootTarget) {\n            this.$rootTarget.off(this.eventNamespace)\n        } else {\n            this.$target.off(this.eventNamespace)\n        }\n    },\n\n    /**\n     * @public\n     */\n    hide: function() {\n\n        const {settings} = this\n\n        if (!settings) {\n            return\n        }\n\n        this.unbindHideActions(settings.currentTarget)\n\n        this.$el.removeClass(settings.className)\n        this.$el.remove()\n    },\n\n    /**\n     * @public\n     * @param {jQuery.Event=} evt\n     */\n    show: function(evt) {\n\n        this.render(evt || { target: this.options.target })\n    },\n\n    /**\n     * @public\n     * @param {jQuery.Event=} evt\n     */\n    toggle: function(evt) {\n\n        if (this.isVisible()) {\n            this.hide()\n        } else {\n            this.show(evt)\n        }\n    },\n\n    /**\n     * @public\n     */\n    isVisible: function() {\n\n        // Check if tooltip is in the DOM\n        return document.body.contains(this.el)\n    },\n\n    /**\n     * @public\n     * @param {{target: string|Element}|{x:number, y:number}} evt\n     */\n    render: function(evt) {\n\n        const point = evt.x !== undefined && evt.y !== undefined ? evt : null\n        const element = $(evt.target).closest(this.options.target)[0]\n\n        const settings = this.settings = this.getTooltipSettings(element)\n        settings.currentTarget = element\n\n        this.bindHideActions(element)\n\n        let targetBBox\n        if (point) {\n            targetBBox = { x: point.x, y: point.y, width: 1, height: 1 }\n        } else {\n            targetBBox = joint.util.getElementBBox(element)\n        }\n\n        this.$('.tooltip-content').html(settings.content)\n\n        // Hide the element first so that we don't get a jumping effect during the image loading.\n        this.$el.hide()\n        this.$el.removeClass('left right top bottom')\n        this.$el.addClass(settings.className)\n\n        $(document.body).append(this.$el)\n\n        // If there is an image in the `content`, wait till it's loaded as only after that\n        // we know the dimension of the tooltip.\n        const $images = this.$('img')\n        if ($images.length) {\n\n            $images.on('load', function() {\n                this.position(targetBBox)\n                this.$el.addClass('rendered')\n            }.bind(this))\n\n        } else {\n            this.position(targetBBox)\n            this.$el.addClass('rendered')\n        }\n    },\n\n    /**\n     * @param el {Element}\n     * @returns {Object}\n     */\n    getTooltipSettings: function(el) {\n\n        const elementDefinition = this.loadDefinitionFromElementData(el)\n        return this.evaluateOptions(el, elementDefinition)\n    },\n\n    /**\n     * @private\n     * @param {Element} element\n     */\n    unbindHideActions: function(element) {\n\n        const hideActionsNamespace = `${this.eventNamespace  }.remove`\n\n        $(element).off(hideActionsNamespace)\n        clearInterval(this.interval)\n    },\n\n    /**\n     * @private\n     * Checks if tooltip's target element is still in dom. Hides tooltip when target element is removed.\n     * @param {Element} element\n     */\n    bindHideOnRemoveTarget: function(element) {\n\n        clearInterval(this.interval)\n        this.interval = setInterval(function() {\n\n            if (!$.contains(document, element)) {\n                clearInterval(this.interval)\n                this.hide()\n            }\n        }.bind(this), 500)\n    },\n\n    /**\n     * @private\n     * @param {Element} element\n     */\n    bindHideActions: function(element) {\n\n        const {settings} = this\n\n        const $element = $(element)\n        const hideActionsNamespace = `${this.eventNamespace  }.remove`\n\n        this.bindHideOnRemoveTarget(element)\n\n        this.options.trigger.split(' ').forEach(function(trigger) {\n\n            const hideEvents = {\n                hover: ['mouseout', 'mousedown'],\n                focus: ['focusout']\n            }\n\n            let events = hideEvents[trigger] || []\n            if (settings.hideTrigger) {\n                events = settings.hideTrigger.split(' ') || []\n            }\n\n            events.forEach(function(eventName) {\n                $element.on(eventName + hideActionsNamespace, this.hide)\n            }, this)\n\n        }, this)\n    },\n\n    /**\n     * @private\n     * get options from element data, normalize deprecated definition.\n     * @param {Element} element\n     * @param {Object} elementDefinition\n     * @returns {Object}\n     */\n    evaluateOptions: function(element, elementDefinition) {\n\n        elementDefinition = elementDefinition || {}\n\n        const settings = joint.util.assign({}, elementDefinition, this.options)\n\n        joint.util.forIn(settings, function(value, key) {\n            const evaluated = joint.util.isFunction(value) ? value(element) : value\n            settings[key] = evaluated === undefined || evaluated === null ? elementDefinition[key] : evaluated\n        })\n\n        this.normalizePosition(settings)\n        return settings\n    },\n\n    /**\n     * @private\n     * @param {Element} element\n     * @returns {Object}\n     */\n    loadDefinitionFromElementData: function(element) {\n\n        if (!element) {\n            return {}\n        }\n\n        const isIgnored = function(key) {\n\n            return key === 'left' || key === 'bottom' || key === 'top' || key === 'right'\n        }\n\n        const data = this.getAllAttrs(element, `data-${  this.options.dataAttributePrefix}`)\n        const options = {}\n\n        joint.util.forIn(data, function(value, key) {\n\n            if (key === '') {\n                key = 'content'\n            }\n\n            if (!isIgnored(key)) {\n                options[key] = value\n            }\n        })\n\n        return options\n    },\n\n    /**\n     * @private\n     * @param {Element} element\n     * @param {string} namePrefix\n     * @returns {{string:*}}\n     */\n    getAllAttrs: function(element, namePrefix) {\n\n        const prefix = namePrefix || ''\n        const attrs = element.attributes\n        const dataAttrs = {}\n\n\n        for (let i = 0, n = attrs.length; i < n; i++) {\n            const attr = attrs[i]\n\n            if (attr && attr.name.startsWith(prefix)) {\n                const name = joint.util.camelCase(attr.name.slice(prefix.length))\n                dataAttrs[name] = attr.value\n            }\n        }\n        return dataAttrs\n    },\n\n    /**\n     * @private\n     * modifies the options, use deprecated properties if needed.\n     * @param {Object} options\n     */\n    normalizePosition: function(options) {\n\n        const deprecatedDefinition = options.left || options.right || options.top || options.bottom\n\n        if (!options.position && deprecatedDefinition) {\n            if (options.left) {\n                options.position = 'left'\n            }\n            if (options.right) {\n                options.position = 'right'\n            }\n            if (options.top) {\n                options.position = 'top'\n            }\n            if (options.bottom) {\n                options.position = 'bottom'\n            }\n        }\n\n        if (!options.positionSelector && deprecatedDefinition) {\n            options.positionSelector = deprecatedDefinition\n        }\n    },\n\n    /**\n     * @private\n     * @param {rect} targetBBox\n     */\n    position: function(targetBBox) {\n\n        const {settings} = this\n\n        // Show the tooltip. Do this before we ask for its dimension, otherwise they won't be defined yet.\n        this.$el.show()\n        this.$el.css('width', 'auto')\n\n        // No Selector => Get BBox of the body element.\n        const viewport = this.getViewportViewBBox()\n\n        const tooltipBBox = this.getTooltipBBox(targetBBox, viewport)\n\n        const arrowPosition = {}\n\n        //Arrow to the middle (vertical/horizontal) of the targetElement\n        if (settings.position === 'left' || settings.position === 'right') {\n            arrowPosition.top = targetBBox.y + targetBBox.height / 2 - tooltipBBox.y\n        } else if (settings.position === 'top' || settings.position === 'bottom') {\n            arrowPosition.left = targetBBox.x + targetBBox.width / 2 - tooltipBBox.x\n        } else {\n            //As if `options.left` was set to the target element.\n            arrowPosition.top = targetBBox.y + targetBBox.height / 2 - tooltipBBox.y\n        }\n\n        // Move the tooltip to the right position\n        this.$el.css({\n            left: tooltipBBox.x,\n            top: tooltipBBox.y,\n            width: tooltipBBox.width || 'auto'\n        })\n\n        const $arrows = this.$('.tooltip-arrow, .tooltip-arrow-mask')\n\n        // Reset style of previous tooltip\n        $arrows.removeAttr('style')\n        // Move the arrow\n        $arrows.css(arrowPosition)\n\n        if (settings.direction && settings.direction !== 'off') {\n            this.$el.addClass(settings.direction === 'auto' ? (settings.position || 'left') : settings.direction)\n        }\n    },\n\n    getViewportViewBBox: function() {\n\n        const {settings} = this\n\n        const el = settings.viewport.selector ? $(settings.currentTarget).closest(settings.viewport.selector) : 'html'\n\n        const viewportBBox = joint.util.getElementBBox(el)\n\n        // No Selector => Get browser window size.\n        // note: 'html' doesn't return a full window height.\n        // but returns 0 if body elements have position: absolute.\n        const $window = $(window)\n        if (!settings.viewport.selector) {\n            viewportBBox.width = $window.width() + $window.scrollLeft()\n            viewportBBox.height = $window.height() + $window.scrollTop()\n        }\n\n        const viewportPadding = settings.viewport.padding || 0\n        viewportBBox.x += viewportPadding\n        viewportBBox.y += viewportPadding\n        viewportBBox.width -= 2 * viewportPadding\n        viewportBBox.height -= 2 * viewportPadding\n\n        return viewportBBox\n    },\n\n    getPosition: function(positionedBBox, targetBBox, bBox, viewport) {\n\n        const {settings} = this\n        const type = settings.position || 'left'\n        const {padding} = settings\n        const minWidth = Math.min(settings.minResizedWidth, bBox.width + padding)\n\n        const map = {\n            left: function(manipulable) {\n\n                const position = {\n                    x: positionedBBox.x + positionedBBox.width + padding,\n                    y: targetBBox.y + targetBBox.height / 2 - bBox.height / 2\n                }\n\n                if (manipulable) {\n\n                    const availableSize = viewport.x + viewport.width - (position.x)\n\n                    if (availableSize > minWidth && availableSize < bBox.width + padding) {\n                        position.width = availableSize\n                    }\n\n                    if (availableSize < minWidth) {\n                        settings.position = 'right'\n                        return this.right(false)\n                    }\n                }\n\n                return position\n            },\n            right: function(manipulable) {\n\n                const position = {\n                    x: positionedBBox.x - bBox.width - padding,\n                    y: targetBBox.y + targetBBox.height / 2 - bBox.height / 2\n                }\n\n                if (manipulable) {\n\n                    const availableSize = positionedBBox.x - padding - viewport.x\n\n                    if (availableSize > minWidth && availableSize < bBox.width + padding) {\n                        position.width = availableSize\n                        position.x = viewport.x\n                    }\n\n                    if (availableSize < minWidth) {\n                        settings.position = 'left'\n                        return this.left(false)\n                    }\n                }\n\n                return position\n\n            },\n            top: function(manipulable) {\n\n                const position = {\n                    x: targetBBox.x + targetBBox.width / 2 - bBox.width / 2,\n                    y: positionedBBox.y + positionedBBox.height + padding\n                }\n\n                if (manipulable) {\n\n                    const availableSize = (viewport.y + viewport.height) - (positionedBBox.y + positionedBBox.height + padding)\n\n                    if (availableSize < bBox.height) {\n                        settings.position = 'bottom'\n                        return this.bottom(false)\n                    }\n                }\n\n                return position\n            },\n            bottom: function(manipulable) {\n\n                const position = {\n                    x: targetBBox.x + targetBBox.width / 2 - bBox.width / 2,\n                    y: positionedBBox.y - bBox.height - padding\n                }\n                if (manipulable) {\n\n                    const availableSize = (positionedBBox.y - padding) - viewport.y\n\n                    if (availableSize < bBox.height) {\n                        settings.position = 'top'\n                        return this.top(false)\n                    }\n                }\n\n                return position\n            }\n        }\n\n        return map[type](minWidth > 0)\n    },\n\n\n    /**\n     * @private\n     * @param {rect} targetBBox\n     * @param {rect} viewport\n     * @returns {{width: number, height: number}}\n     */\n    getTooltipBBox: function(targetBBox, viewport) {\n\n        let $element\n        let positionedBBox\n        const dimensions = this.measureTooltipElement()\n\n        $element = $(this.settings.positionSelector)\n        positionedBBox = $element[0] ? joint.util.getElementBBox($element[0]) : targetBBox\n\n        const bBox = this.getPosition(positionedBBox, targetBBox, dimensions, viewport)\n        // If the tooltip overflows the viewport on top and bottom sides (the top side wins).\n        if (bBox.y < viewport.y) {\n            bBox.y = viewport.y\n        } else if (bBox.y + dimensions.height > viewport.y + viewport.height) {\n            bBox.y = viewport.y + viewport.height - dimensions.height\n        }\n\n        const bBoxWidth = bBox.width || dimensions.width\n        // If the tooltip overflows the viewport on the left and right sides (the left side wins).\n        if (bBox.x < viewport.x) {\n            bBox.x = viewport.x\n        } else if (bBox.x + bBoxWidth > viewport.x + viewport.width) {\n            bBox.x = viewport.x + viewport.width - bBoxWidth\n        }\n\n        return bBox\n    },\n\n    /**\n     * @private\n     * @returns {{width: number, height: number}}\n     */\n    measureTooltipElement: function() {\n\n        const $measure = this.$el.clone().appendTo($('body')).css({ left: -1000, top: -500 })\n\n        const dimensions = {\n            width: $measure.outerWidth(),\n            height: $measure.outerHeight()\n        }\n        $measure.remove()\n\n        return dimensions\n    }\n})\n\n//  Snaplines plugin\n//-------------------\n\n// Snaplines plugin helps creating diagramms by snapping elements to better-looking positions\n// (aligned with other elements) while they are dragged. It's an alternative to layout algorithms.\n\njoint.ui.Snaplines = joint.mvc.View.extend({\n\n    options: {\n        paper: undefined,\n        distance: 10\n    },\n\n    className: 'snaplines',\n\n    init: function() {\n\n        joint.util.bindAll(this, 'hide')\n\n        this.$horizontal = $('<div>').addClass('snapline horizontal').appendTo(this.el)\n        this.$vertical = $('<div>').addClass('snapline vertical').appendTo(this.el)\n\n        this.$el.hide().appendTo(this.options.paper.el)\n\n        this.startListening()\n    },\n\n    startListening: function() {\n\n        this.stopListening()\n\n        this.listenTo(this.options.paper, 'cell:pointerdown', this.captureCursorOffset)\n        this.listenTo(this.options.paper, 'cell:pointermove', this.snapWhileMoving)\n        this.listenTo(this.options.paper.model, 'batch:stop', this.onBatchStop)\n\n        $(document).on('mouseup touchend', this.hide)\n\n        // Cache filters and make tham a hash table for easier and faster access.\n        // `options.filter` can contain either strings in which case they are considered\n        // cell types that should be filtered out or objects in which case they must\n        // be cells that should be filtered out from snapping. Alternatively,\n        // `options.filter` can be a function that is passed an element and must\n        // return `true` if the element should be filtered out of the snapping.\n        this.filterTypes = {}\n        this.filterCells = {}\n        this.filterFunction = undefined\n\n        if (Array.isArray(this.options.filter)) {\n\n            this.options.filter.forEach(function(item) {\n\n                if (joint.util.isString(item)) {\n                    this.filterTypes[item] = true\n                } else {\n                    this.filterCells[item.id] = true\n                }\n\n            }, this)\n\n        } else if (joint.util.isFunction(this.options.filter)) {\n\n            this.filterFunction = this.options.filter\n        }\n    },\n\n    onBatchStop: function(data) {\n\n        data = data || {}\n\n        if (data.batchName === 'resize') {\n\n            this.snapWhileResizing(data.cell, data)\n        }\n    },\n\n    captureCursorOffset: function(cellView, evt, x, y) {\n\n        if (!this.canElementMove(cellView)) {\n            return \n        }\n\n        const cellPosition = cellView.model.get('position')\n\n        // store the difference between top-left corner and pointer coordinates\n        this._cursorOffset = {\n            x: x - cellPosition.x,\n            y: y - cellPosition.y\n        }\n    },\n\n    snapWhileResizing: function(cell, opt) {\n\n        if (!opt.ui || opt.snapped || !opt.direction || !opt.trueDirection) return\n\n        const cellView = this.options.paper.findViewByModel(cell)\n\n        if (!cellView || !cellView.model.isElement()) {\n            return \n        }\n\n        const cellBBox = cell.getBBox()\n        const cellBBoxRotated = cellBBox.bbox(cell.get('angle'))\n        const cellTopLeft = cellBBoxRotated.origin()\n        const cellBottomRight = cellBBoxRotated.corner()\n        const normalizedAngle = g.normalizeAngle(cell.get('angle'))\n        const {distance} = this.options\n        let vertical = null\n        let horizontal = null\n\n        // The vertical and horizontal lines to use when checking for snaplines.\n        const cellLine = { vertical: 0, horizontal: 0 }\n\n        const {direction} = opt\n        const {trueDirection} = opt\n        const {relativeDirection} = opt\n\n        if (trueDirection.indexOf('right') !== -1) {\n            cellLine.vertical = cellBottomRight.x\n        } else {\n            cellLine.vertical = cellTopLeft.x\n        }\n\n        if (trueDirection.indexOf('bottom') !== -1) {\n            cellLine.horizontal = cellBottomRight.y\n        } else {\n            cellLine.horizontal = cellTopLeft.y\n        }\n\n        this.options.paper.model.getElements().find(function(snapElement) {\n\n            if (\n                snapElement.id === cell.id ||\n                snapElement.isEmbeddedIn(cell) ||\n                this.filterTypes[snapElement.get('type')] ||\n                this.filterCells[snapElement.id] ||\n                (this.filterFunction && this.filterFunction(snapElement))\n            ) {\n                return false\n            }\n\n            const snapBBox = snapElement.getBBox().bbox(snapElement.get('angle'))\n            const snapTopLeft = snapBBox.origin()\n            const snapBottomRight = snapBBox.corner()\n\n            const snapLinesByAxis = {\n                vertical: [\n                    snapTopLeft.x,\n                    snapBottomRight.x\n                ],\n                horizontal: [\n                    snapTopLeft.y,\n                    snapBottomRight.y\n                ]\n            }\n\n            joint.util.forIn(snapLinesByAxis, function(snapLines, axis) {\n\n                snapLines = snapLines.map(function(snapLine) {\n\n                    return {\n                        position: snapLine,\n                        // Calculate the distance to each snapline.\n                        distance: Math.abs(snapLine - cellLine[axis])\n                    }\n                })\n\n                // Filter out snaplines that are too far away.\n                snapLines = snapLines.filter(function(snapLine) {\n                    return snapLine.distance < distance\n                })\n\n                // Sort by distance.\n                snapLines = joint.util.sortBy(snapLines, function(snapLine) {\n                    return snapLine.distance\n                })\n\n                snapLinesByAxis[axis] = snapLines\n            })\n\n            if (vertical === null && snapLinesByAxis.vertical.length > 0) {\n\n                vertical = snapLinesByAxis.vertical[0].position\n            }\n\n            if (horizontal === null && snapLinesByAxis.horizontal.length > 0) {\n\n                horizontal = snapLinesByAxis.horizontal[0].position\n            }\n\n            // keeps looking until all elements processed or both vertical and horizontal line found\n            return joint.util.isNumber(vertical) && joint.util.isNumber(horizontal)\n\n        }, this)\n\n        this.hide()\n\n        if (joint.util.isNumber(vertical) || joint.util.isNumber(horizontal)) {\n\n            let diffX = 0\n\n            if (joint.util.isNumber(vertical)) {\n\n                if (trueDirection.indexOf('right') !== -1) {\n                    diffX = vertical - cellBBoxRotated.corner().x\n                } else {\n                    diffX = cellBBoxRotated.origin().x - vertical\n                }\n            }\n\n            let diffY = 0\n\n            if (joint.util.isNumber(horizontal)) {\n\n                if (trueDirection.indexOf('bottom') !== -1) {\n                    diffY = horizontal - cellBBoxRotated.corner().y\n                } else {\n                    diffY = cellBBoxRotated.origin().y - horizontal\n                }\n            }\n\n            let diffWidth = 0\n            let diffHeight = 0\n            const isAtRightAngle = !(normalizedAngle % 90)\n\n            if (isAtRightAngle) {\n\n                if (normalizedAngle === 90 || normalizedAngle === 270) {\n\n                    diffWidth = diffY\n                    diffHeight = diffX\n\n                } else {\n\n                    diffWidth = diffX\n                    diffHeight = diffY\n                }\n\n            } else {\n\n                // A little bit more complicated.\n\n                // See:\n                // https://www.mathsisfun.com/algebra/trig-four-quadrants.html\n                let quadrant\n\n                if (normalizedAngle >= 0 && normalizedAngle < 90) {\n                    quadrant = 1\n                } else if (normalizedAngle >= 90 && normalizedAngle < 180) {\n                    quadrant = 4\n                } else if (normalizedAngle >= 180 && normalizedAngle < 270) {\n                    quadrant = 3\n                } else {\n                    quadrant = 2\n                }\n\n                if (horizontal && vertical) {\n\n                    // Use only one of the snaplines.\n                    // Pick the closest snapline.\n                    if (diffY > diffX) {\n                        diffY = 0\n                        horizontal = null\n                    } else {\n                        diffX = 0\n                        vertical = null\n                    }\n                }\n\n                const angleInRadians = g.toRad(normalizedAngle % 90)\n\n                if (diffX) {\n                    if (quadrant === 3) {\n                        diffWidth = diffX / Math.cos(angleInRadians)\n                    } else {\n                        diffWidth = diffX / Math.sin(angleInRadians)\n                    }\n                }\n\n                if (diffY) {\n                    if (quadrant === 3) {\n                        diffHeight = diffY / Math.cos(angleInRadians)\n                    } else {\n                        diffHeight = diffY / Math.sin(angleInRadians)\n                    }\n                }\n\n                const isQuadrantOneOrThree = quadrant === 1 || quadrant === 3\n\n                switch (relativeDirection) {\n\n                    case 'top':\n                    case 'bottom':\n\n                        if (diffY) {\n                            diffHeight = diffY / (isQuadrantOneOrThree ? Math.cos(angleInRadians) : Math.sin(angleInRadians))\n                        } else {\n                            diffHeight = diffX / (isQuadrantOneOrThree ? Math.sin(angleInRadians) : Math.cos(angleInRadians))\n                        }\n                        break\n\n                    case 'left':\n                    case 'right':\n\n                        if (diffX) {\n                            diffWidth = diffX / (isQuadrantOneOrThree ? Math.cos(angleInRadians) : Math.sin(angleInRadians))\n                        } else {\n                            diffWidth = diffY / (isQuadrantOneOrThree ? Math.sin(angleInRadians) : Math.cos(angleInRadians))\n                        }\n                        break\n                }\n            }\n\n            switch (relativeDirection) {\n\n                case 'top':\n                case 'bottom':\n                    // Keep the width the same.\n                    diffWidth = 0\n                    break\n\n                case 'left':\n                case 'right':\n                    // Keep the height the same.\n                    diffHeight = 0\n                    break\n            }\n\n            const {gridSize} = this.options.paper.options\n            let newWidth = Math.max(cellBBox.width + diffWidth, gridSize)\n            let newHeight = Math.max(cellBBox.height + diffHeight, gridSize)\n\n            if (opt.minWidth && opt.minWidth > gridSize) {\n                newWidth = Math.max(newWidth, opt.minWidth)\n            }\n\n            if (opt.minHeight && opt.minHeight > gridSize) {\n                newHeight = Math.max(newHeight, opt.minHeight)\n            }\n\n            if (opt.maxWidth) {\n                newWidth = Math.min(newWidth, opt.maxWidth)\n            }\n\n            if (opt.maxHeight) {\n                newHeight = Math.min(newHeight, opt.maxHeight)\n            }\n\n            if (opt.preserveAspectRatio) {\n\n                if (diffWidth > diffHeight) {\n                    newHeight = newWidth * (cellBBox.height / cellBBox.width)\n                } else {\n                    newWidth = newHeight * (cellBBox.width / cellBBox.height)\n                }\n            }\n\n            if (newWidth !== cellBBox.width || newHeight !== cellBBox.height) {\n\n                cell.resize(newWidth, newHeight, {\n                    snaplines: this.cid,\n                    restrictedArea: this.options.paper.getRestrictedArea(cellView),\n                    direction: direction,\n                    relativeDirection: relativeDirection,\n                    trueDirection: trueDirection,\n                    // backwards compatibility\n                    snapped: true\n                })\n            }\n\n            // Due to the applying minimal/maximal width/height the element might not be\n            // snapped to a snapline in the end. We need to check this.\n            const resBBox = cell.getBBox().bbox(normalizedAngle)\n            const precision = 1\n            if (\n                vertical &&\n                (Math.abs(resBBox.x - vertical) > precision) &&\n                (Math.abs(resBBox.width + resBBox.x - vertical) > precision)\n            ) {\n                vertical = null\n            }\n            if (\n                horizontal &&\n                (Math.abs(resBBox.y - horizontal) > precision) &&\n                (Math.abs(resBBox.height + resBBox.y - horizontal) > precision)\n            ) {\n                horizontal = null\n            }\n\n            this.show({ vertical: vertical, horizontal: horizontal })\n        }\n    },\n\n    canElementMove: function(cellView) {\n\n        return cellView && cellView.model.isElement() && cellView.can('elementMove')\n    },\n\n    snapWhileMoving: function(cellView, evt, x, y) {\n\n        if (!this.canElementMove(cellView)) {\n            return \n        }\n\n        const cell = cellView.model\n        const currentPosition = cell.get('position')\n        const currentSize = cell.get('size')\n        const cellBBox = g.rect(joint.util.assign({\n            x: x - this._cursorOffset.x,\n            y: y - this._cursorOffset.y\n        }, currentSize))\n        const cellCenter = cellBBox.center()\n        const cellBBoxRotated = cellBBox.bbox(cell.get('angle'))\n        const cellTopLeft = cellBBoxRotated.origin()\n        const cellBottomRight = cellBBoxRotated.corner()\n\n        const {distance} = this.options\n        let vertical = null\n        let horizontal = null\n        let verticalFix = 0\n        let horizontalFix = 0\n\n        // find vertical and horizontal lines by comparing top-left, bottom-right and center bbox points\n        this.options.paper.model.getElements().find(function(snapElement) {\n\n            if (\n                snapElement === cell ||\n                snapElement.isEmbeddedIn(cell) ||\n                this.filterTypes[snapElement.get('type')] ||\n                this.filterCells[snapElement.id] ||\n                (this.filterFunction && this.filterFunction(snapElement))\n            ) {\n                return false\n            }\n\n            const snapBBox = snapElement.getBBox().bbox(snapElement.get('angle'))\n            const snapCenter = snapBBox.center()\n            const snapTopLeft = snapBBox.origin()\n            const snapBottomRight = snapBBox.corner()\n\n            if (vertical === null) {\n\n                if (Math.abs(snapCenter.x - cellCenter.x) < distance) {\n                    vertical = snapCenter.x\n                    verticalFix = 0.5\n                } else if (Math.abs(snapTopLeft.x - cellTopLeft.x) < distance) {\n                    vertical = snapTopLeft.x\n                } else if (Math.abs(snapTopLeft.x - cellBottomRight.x) < distance) {\n                    vertical = snapTopLeft.x\n                    verticalFix = 1\n                } else if (Math.abs(snapBottomRight.x - cellBottomRight.x) < distance) {\n                    vertical = snapBottomRight.x\n                    verticalFix = 1\n                } else if (Math.abs(snapBottomRight.x - cellTopLeft.x) < distance) {\n                    vertical = snapBottomRight.x\n                }\n            }\n\n            if (horizontal === null) {\n\n                if (Math.abs(snapCenter.y - cellCenter.y) < distance) {\n                    horizontal = snapCenter.y\n                    horizontalFix = 0.5\n                } else if (Math.abs(snapTopLeft.y - cellTopLeft.y) < distance) {\n                    horizontal = snapTopLeft.y\n                } else if (Math.abs(snapTopLeft.y - cellBottomRight.y) < distance) {\n                    horizontal = snapTopLeft.y\n                    horizontalFix = 1\n                } else if (Math.abs(snapBottomRight.y - cellBottomRight.y) < distance) {\n                    horizontal = snapBottomRight.y\n                    horizontalFix = 1\n                } else if (Math.abs(snapBottomRight.y - cellTopLeft.y) < distance) {\n                    horizontal = snapBottomRight.y\n                }\n            }\n\n            // keeps looking until all elements processed or both vertical and horizontal line found\n            return joint.util.isNumber(vertical) && joint.util.isNumber(horizontal)\n\n        }, this)\n\n        this.hide()\n\n        if (joint.util.isNumber(vertical) || joint.util.isNumber(horizontal)) {\n\n            if (joint.util.isNumber(vertical)) {\n                cellBBoxRotated.x = vertical - (verticalFix * cellBBoxRotated.width)\n            }\n\n            if (joint.util.isNumber(horizontal)) {\n                cellBBoxRotated.y = horizontal - (horizontalFix * cellBBoxRotated.height)\n            }\n\n            // find x and y of the unrotated cell\n            const newCellCenter = cellBBoxRotated.center()\n            const newX = newCellCenter.x - (cellBBox.width / 2)\n            const newY = newCellCenter.y - (cellBBox.height / 2)\n\n            cell.translate(newX - currentPosition.x, newY - currentPosition.y, {\n                restrictedArea: this.options.paper.getRestrictedArea(cellView),\n                snapped: true\n            })\n\n            this.show({ vertical: vertical, horizontal: horizontal })\n        }\n    },\n\n    show: function(opt) {\n\n        opt = opt || {}\n\n        const ctm = this.options.paper.matrix()\n\n        if (opt.horizontal) {\n            this.$horizontal.css('top', opt.horizontal * ctm.d + ctm.f).show()\n        } else {\n            this.$horizontal.hide()\n        }\n\n        if (opt.vertical) {\n            this.$vertical.css('left', opt.vertical * ctm.a + ctm.e).show()\n        } else {\n            this.$vertical.hide()\n        }\n\n        this.$el.show()\n    },\n\n    hide: function() {\n\n        this.$el.hide()\n    },\n\n    onRemove: function() {\n\n        $(document).off('mouseup', this.hide)\n    }\n})\n\n/* eslint no-console: 'off' */\n\n// ui.TextEditor\n// =============\n\n// Inline SVG text editing that is nearly identical to the native text\n// editing inside the HTML textarea element.\n\n// Features:\n// ---------\n\n// - Rich text editing.\n// - Selections.\n// - Caret.\n// - Caret positioning left or right based on the distance to\n//   the left/right edge of the clicked character.\n// - Handles newlines seamlessly.\n// - Selections, both all-text and portions of text.\n// - Word selection by double-click.\n// - Whole text selection by triple-click.\n// - Keyboard navigation native to the underlying OS.\n// - API for programmatic access (selections, caret, word boundary, ...).\n// - Selections and caret can be styled in CSS.\n// - Supports editing of a rotated text.\n// - Supports editing of a scaled text.\n\n// Important note: The ui.TextEditor assumes the SVG `<text>` element\n// contains a `<tspan>` element for each line. Lines are ordered as they\n// appear in the DOM. If a line is empty, it is assumed the `<tspan>`\n// element contains a space character.\n// This is in line with how Vectorizer renders text.\n\njoint.ui.TextEditor = joint.mvc.View.extend({\n\n    options: {\n        text: undefined, // The SVG text element on which we want to enable inline text editing.\n        newlineCharacterBBoxWidth: 10, // The width of the new line character. Used for selection of a newline.\n        placeholder: undefined,  // The placeholder in case the text gets emptied.\n        focus: true, // Determines if the textarea should gain focus. In some cases, this is not intentional - e.g. if we use the ui.TextEditor for displaying remote cursor.\n        debug: false,\n        useNativeSelection: true,\n        annotateUrls: false,\n        urlAnnotation: {\n            attrs: {\n                class: 'url-annotation',\n                fill: 'lightblue',\n                'text-decoration': 'underline'\n            }\n        },\n        textareaAttributes: {\n            autocorrect: 'off',\n            autocomplete: 'off',\n            autocapitalize: 'off',\n            spellcheck: 'false',\n            tabindex: '0'\n        }\n    },\n\n    className: 'text-editor',\n\n    events: {\n        'keyup textarea': 'onKeyup',\n        'input textarea': 'onInput',\n        'copy textarea': 'onCopy',\n        'cut textarea': 'onCut',\n        'paste textarea': 'onPaste',\n        'mousedown .char-selection-box': 'onMousedown',\n        'dblclick .char-selection-box': 'onDoubleClick',\n        'click .char-selection-box': 'onTripleClick'\n    },\n\n    selection: {\n        start: null,\n        end: null\n    },\n\n    selecting: false,\n\n    init: function() {\n\n        joint.util.bindAll(this, 'onMousedown', 'onMousemove', 'onMouseup', 'onDoubleClick', 'onTripleClick', 'onKeydown', 'onAfterPaste', 'onAfterKeydown')\n\n        this.setTextElement(this.options.text)\n\n        $(document.body).on('mousemove', this.onMousemove)\n        $(document.body).on('mouseup', this.onMouseup)\n        $(document.body).on('keydown', this.onKeydown)\n\n        if (this.options.cellView) {\n            this.$viewport = $(this.options.cellView.paper.viewport)\n        } else {\n            // If cellView is not passed, the viewport (text-selectable area) is the text element itself.\n            // If $viewport is not set, Chrome prints a warning about \"Discontiguous Selection\" and selections are not rendered.\n            this.$viewport = $(this.options.text)\n        }\n\n        if (this.options.annotations) {\n            this.setAnnotations(this.options.annotations)\n        }\n    },\n\n    setTextElement: function(textElement) {\n\n        if (this.$elText) {\n            this.unbindTextElement()\n        }\n\n        this.options.text = textElement\n\n        this.$elText = $(textElement)\n        this.$elText.on('mousedown', this.onMousedown)\n        this.$elText.on('dblclick', this.onDoubleClick)\n        this.$elText.on('click', this.onTripleClick)\n    },\n\n    // @public\n    render: function(root) {\n\n        // The caret (cursor), displayed as a thin <div> styled in CSS.\n        this.$caret = $('<div>', { class: 'caret' })\n\n        // The container for selection boxes.\n        this.$selection = $('<div>')\n        // One selection box covering one character.\n        this.$selectionBox = $('<div>', { class: 'char-selection-box' })\n        this.$el.append(this.$caret, this.$selection)\n\n        this.$textareaContainer = $('<div>', { class: 'textarea-container' })\n\n        this.$textarea = $('<textarea>', this.options.textareaAttributes)\n        this.textarea = this.$textarea[0]\n        this._textContent = this.textarea.value = this.getTextContent()\n\n        this._textareaValueBeforeInput = this.textarea.value\n        this.$textareaContainer.append(this.textarea)\n\n        if (this.options.focus) {\n            this.$el.append(this.$textareaContainer)\n        }\n\n        // First add the container element to the `<body>`, otherwise\n        // the `focus()` called afterwords would not work.\n        $(root || document.body).append(this.$el)\n\n        const bbox = V(this.options.text).bbox()\n\n        this.$textareaContainer.css({\n            left: bbox.x,\n            top: bbox.y\n        })\n\n        this.focus()\n\n        // TODO: This should be optional?\n        V(this.options.text).attr('cursor', 'text')\n\n        this.selectAll()\n\n        return this\n    },\n\n    annotateURLBeforeCaret: function(selectionStart) {\n\n        // If whitespace character was added, check if there is not a URL\n        // before the inserted text. If yes, annotate it.\n        const urlBoundary = this.getURLBoundary(Math.max(selectionStart - 1, 0))\n        if (urlBoundary) {\n            this.annotateURL(this.getAnnotations() || [], urlBoundary[0], urlBoundary[1])\n            return true\n        }\n\n        return false\n    },\n\n    hasSelection: function() {\n\n        return joint.util.isNumber(this.selection.start) &&\n                joint.util.isNumber(this.selection.end) &&\n                this.selection.start !== this.selection.end\n    },\n\n    textContentHasChanged: function() {\n\n        return this._textContent !== this.textarea.value\n    },\n\n    restoreTextAreaSelectionDirection: function() {\n\n        if (this._selectionDirection) {\n            this.textarea.selectionDirection = this._selectionDirection\n        }\n    },\n\n    storeSelectionDirection: function() {\n\n        this._selectionDirection = this.textarea.selectionDirection\n    },\n\n    onKeydown: function(evt) {\n\n        if (this.options.debug) {\n            console.log('onKeydown(): ', evt.keyCode)\n        }\n\n        if (this.hasSelection()) {\n            this.deselect()\n            // Restore the textarea.selectionDirection so that the textarea knows in what direction\n            // it should select in case Shift+Arrow keys are used.\n            this.restoreTextAreaSelectionDirection()\n        }\n\n        // The stream of events when typing something to the textarea is:\n        // keydown -> keypress/paste -> letter typed in textarea -> keyup.\n        // Therefore, in keydown, we can store the selectionStart\n        // value of the textarea before it is adjusted based on the input.\n        // Also note that we use keydown and not keypress because\n        // e.g. BACKSPACE key is not handled in keypress.\n\n        // We want the navigation keys to be reflected in the UI immediately on keydown.\n        // However, at that time, the textarea's selectionStart/End does not yet\n        // take into account this very keydown action. Hence we need to\n        // defer the `setCaret()` to the next turn. Note that there is no other way\n        // as keypress is not triggered for arrow keys and when keyup is triggered, it's too late.\n        setTimeout(this.onAfterKeydown, 0)\n\n        this._copied = false\n        this._selectionStartBeforeInput = this.textarea.selectionStart\n        this._selectionEndBeforeInput = this.textarea.selectionEnd\n    },\n\n    // Called after the textarea handled the keydown. Remember the order of events:\n    // onKeydown -> textarea receives keydown -> onAfterKeydown\n    onAfterKeydown: function() {\n\n        if (this.$textarea.is(':focus')) {\n\n            // Remember the textarea.selectionDirection because select() wipes it out (by clearning selections).\n            // We will restore it just before the keydown is received by the textarea so that the\n            // textarea selects in the right direction (using the Shift+Arrow keys).\n            this.storeSelectionDirection()\n\n            if (this.textarea.selectionStart === this.textarea.selectionEnd) {\n                this.setCaret(this.textarea.selectionStart)\n            } else {\n                this.select(this.textarea.selectionStart, this.textarea.selectionEnd)\n            }\n        }\n    },\n\n    onKeyup: function(evt) {\n\n        if (this.textContentHasChanged()) {\n            this.onInput(evt)\n        }\n    },\n\n    onCopy: function(evt) {\n\n        if (!this._copied) {\n            this.copyToClipboard()\n        }\n    },\n\n    onCut: function(evt) {\n\n        if (!this._copied) {\n            this.copyToClipboard()\n        }\n    },\n\n    copyToClipboard: function() {\n\n        const copySupported = document.queryCommandSupported && document.queryCommandSupported('copy')\n\n        if (copySupported) {\n            this._copied = true\n            document.execCommand('copy')\n        }\n    },\n\n    onInput: function(evt) {\n\n        if (!this.textContentHasChanged()) return\n\n        const diffLength = this.textarea.value.length - this._textareaValueBeforeInput.length\n\n        const selectionBeforeInput = {\n            start: this._selectionStartBeforeInput,\n            end: this._selectionEndBeforeInput\n        }\n\n        const selectionAfterInput = {\n            start: this.textarea.selectionStart,\n            end: this.textarea.selectionEnd\n        }\n\n        if (this.options.debug) {\n            console.log('onInput()', evt, 'selectionBeforeInput', selectionBeforeInput, 'selectionAfterInput', selectionAfterInput, 'diffLength', diffLength)\n        }\n\n        const opType = this.inferTextOperationType(selectionBeforeInput, selectionAfterInput, diffLength)\n        let annotated = false\n\n        let annotations = this.getAnnotations()\n\n        // If URL annotation is enabled and the user inserts a whitespace character,\n        // try to detect a URL before the whitespace character. If one was found,\n        // annotate it using the `urlAnnotation` option.\n        if (this.options.annotateUrls && opType === 'insert') {\n\n            const insertedText = this.textarea.value.substr(selectionBeforeInput.start, diffLength)\n            if (this.options.debug) {\n                console.log('onInput()', 'inserted text', insertedText)\n            }\n\n            if (/\\s/.test(insertedText)) {\n\n                annotated = this.annotateURLBeforeCaret(selectionBeforeInput.start)\n                if (annotated) {\n                    // Now we have to shift all the annotations after the inserted whitespace by one to the right.\n                    annotations = this.shiftAnnotations(annotations, selectionAfterInput.end, diffLength)\n                }\n            }\n        }\n\n        if (annotations) {\n\n            // Annotate only if it wasn't already annotated. This can happen if\n            // URL annotation is enabled and we did indeed detect a URL. In this case,\n            // the annotation is handed over to `annotateURL()` and not to the\n            // generic annotation mechanism - based on the previous character.\n            if (!annotated) {\n\n                annotations = this.annotate(annotations, selectionBeforeInput, selectionAfterInput, diffLength)\n            }\n\n            if (this.options.debug) {\n                console.log('onInput()', 'modified annotations', annotations)\n            }\n\n            // Take into account annotation attributes set from outside the text editor.\n            // For example, if the user changes text to bold in the toolbar, the programmer\n            // should call `setCurrentAnnotation()`. Then when the user starts typing ('insert' operation),\n            // we want to create a new annotation with the desired attributes.\n            if (this._currentAnnotationAttributes) {\n\n                if (opType === 'insert') {\n\n                    const insertAnnotation = {\n                        start: selectionBeforeInput.start,\n                        end: selectionAfterInput.end,\n                        attrs: this._currentAnnotationAttributes\n                    }\n                    annotations.push(insertAnnotation)\n\n                    // Current annotations are removed right after the very next input which is now.\n                    // This is because the annotation already become part of the `annotations` array\n                    // and so if the user continues typing, the next characters will inherit\n                    // attributes of the previous one (which has our `insertAnnotation` applied).\n                    this._currentAnnotationAttributes = undefined\n\n                    if (this.options.debug) {\n                        console.log('onInput()', 'insert annotation', insertAnnotation, 'final annotations', annotations)\n                    }\n                }\n            }\n        }\n\n        this._annotations = annotations\n\n        this.trigger('text:change', this.textarea.value, this._textareaValueBeforeInput, annotations, selectionBeforeInput, selectionAfterInput)\n\n        // Store the previous textarea value.\n        this._selectionBeforeInput = selectionAfterInput\n        this._textareaValueBeforeInput = this.textarea.value\n        this._textContent = this.textarea.value\n    },\n\n    onPaste: function(evt) {\n\n        if (this.options.debug) {\n            console.log('onPaste()')\n        }\n\n        this._textareaValueBeforeInput = this.textarea.value\n\n        // Give chance to react on when the text was actually pasted to the textarea\n        // and the textarea adjusted its selectionStart/End.\n        setTimeout(this.onAfterPaste, 0)\n    },\n\n    // Called after the textarea handled the paste. Remember the order of events:\n    // onPaste -> textarea receives paste -> onAfterPaste\n    onAfterPaste: function() {\n\n        this.setCaret(this.textarea.selectionStart)\n    },\n\n    onMousedown: function(evt) {\n\n        // Do not deselect the text if it is a triple-click in order to prevent\n        // the \"blinking effect\" (deselect all -> select all). See `onTripleClick()`.\n        if (evt.originalEvent.detail === 3) return\n\n        if (this.options.debug) {\n            console.log('onMousedown()')\n        }\n\n        const selectionStart = this.getCharNumFromEvent(evt)\n\n        this.startSelecting()\n        this.select(selectionStart)\n\n        // Prevent default action that could set focus\n        // on the text element and therefore the textarea\n        // inside the editor would loose it.\n        evt.preventDefault()\n        // Stop propagation, the active text editor takes over mousedown.\n        evt.stopPropagation()\n    },\n\n    onMousemove: function(evt) {\n\n        if (this.selectionInProgress()) {\n\n            if (this.options.debug) {\n                console.log('onMousemove()')\n            }\n\n            const selectionEnd = this.getCharNumFromEvent(evt)\n\n            // Remember the textarea.selectionDirection so that we can restore it later.\n            // The reason is that select() internally clears the selection (removes all ranges)\n            // which then wipes out the selectionDirection. To make sure that\n            // Shift+Arrow keys select in the right direction, we have to remember it and\n            // restore it later.\n            this.storeSelectionDirection()\n\n            // This will keep the start of the selection and change only the end.\n            this.select(null, selectionEnd)\n\n            // The active text editor takes over mousemove during selection.\n            evt.preventDefault()\n            evt.stopPropagation()\n        }\n    },\n\n    onMouseup: function(evt) {\n\n        if (this.selectionInProgress()) {\n\n            if (this.options.debug) {\n                console.log('onMouseup()')\n            }\n\n            this.stopSelecting()\n            this.trigger('select:changed', this.selection.start, this.selection.end)\n        }\n    },\n\n    onDoubleClick: function(evt) {\n\n        if (this.options.debug) {\n            console.log('onDoubleClick()')\n        }\n\n        const charNum = this.getCharNumFromEvent(evt)\n        const wordBoundary = this.getWordBoundary(charNum)\n        this.select(wordBoundary[0], wordBoundary[1])\n\n        evt.preventDefault()\n        evt.stopPropagation()\n    },\n\n    onTripleClick: function(evt) {\n\n        if (evt.originalEvent.detail !== 3) return\n\n        if (this.options.debug) {\n            console.log('onTripleClick()')\n        }\n\n        this.hideCaret()\n        this.selectAll()\n\n        evt.preventDefault()\n        evt.stopPropagation()\n    },\n\n    // @public\n    // Find all the annotations in the `annotations` array that the\n    // cursor at `selectionStart` position falls into.\n    findAnnotationsUnderCursor: function(annotations, selectionStart) {\n\n        return V.findAnnotationsAtIndex(annotations, selectionStart)\n    },\n\n    // @public\n    // Find all the annotations that fall into the selection range specified by `selectionStart` and `selectionEnd`.\n    // This method assumes the selection range is normalized.\n    findAnnotationsInSelection: function(annotations, selectionStart, selectionEnd) {\n\n        return V.findAnnotationsBetweenIndexes(annotations, selectionStart, selectionEnd)\n    },\n\n    // @private\n    // This function infers the type of a text operation based solely on the selection indices\n    // before and after the text input changed.\n    inferTextOperationType: function(selectionBeforeInput, selectionAfterInput, diffLength) {\n\n        if (selectionBeforeInput.start === selectionBeforeInput.end && selectionAfterInput.start === selectionAfterInput.end && diffLength > 0) {\n\n            return 'insert'\n\n        } else if (selectionBeforeInput.start === selectionBeforeInput.end && selectionAfterInput.start === selectionAfterInput.end && diffLength <= 0) {\n\n            return 'delete-single'\n\n        } else if (selectionBeforeInput.start !== selectionBeforeInput.end && selectionAfterInput.start === selectionAfterInput.end && selectionAfterInput.start === selectionBeforeInput.start) {\n\n            return 'delete'\n\n        } else if (selectionBeforeInput.start !== selectionBeforeInput.end && selectionAfterInput.start !== selectionBeforeInput.start) {\n\n            // Delete followed by insert. The user might have selected a range and then started typing or pasting.\n            return 'delete-insert'\n        }\n\n        return undefined\n    },\n\n    // @private\n    // Modify `annotations` (indices of all the affected annotations)\n    // based on the user action defined by `selectionBeforeInput`, `selectionAfterInput` and `diffLength`.\n    // For example, when the user inserts a new character, we want the new character to inherit\n    // styling attributes (annotation) from the previous character (extend the affected annotation end index) and shift\n    // all the following annotations by one to the right.\n    // Note that this function modifies the original `annotations` array and returns it.\n    annotate: function(annotations, selectionBeforeInput, selectionAfterInput, diffLength) {\n\n        const newAnnotations = []\n\n        const opType = this.inferTextOperationType(selectionBeforeInput, selectionAfterInput, diffLength)\n\n        joint.util.toArray(annotations).forEach(function(annotation) {\n\n            let inAnnotation; let removedInAnnotation\n\n            switch (opType) {\n\n                case 'insert':\n                    if (annotation.start < selectionBeforeInput.start && selectionBeforeInput.start <= annotation.end) {\n                        annotation.end += diffLength\n                    } else if (annotation.start >= selectionBeforeInput.start) {\n                        // We're writting before the annotated portion, move the\n                        // all the following annotations to the right.\n                        annotation.start += diffLength\n                        annotation.end += diffLength\n                    }\n                    break\n\n                case 'delete-single':\n                    // TODO: backspace and delete are two different operations.\n                    // It depends on the selectionAfterInput which one was used.\n                    if (annotation.start < selectionBeforeInput.start && selectionBeforeInput.start <= annotation.end && selectionBeforeInput.start !== selectionAfterInput.start) {\n                        // Backspace.\n                        annotation.end += diffLength\n                    } else if (annotation.start <= selectionBeforeInput.start && selectionBeforeInput.start < annotation.end && selectionBeforeInput.start === selectionAfterInput.start) {\n                        // Delete.\n                        annotation.end += diffLength\n                    } else if (annotation.start >= selectionBeforeInput.start) {\n                        // We're deleting before the annotated portion, move\n                        // all the following annotations by diff length.\n                        annotation.start += diffLength\n                        annotation.end += diffLength\n                    }\n                    break\n\n                case 'delete':\n                    if (annotation.start <= selectionBeforeInput.start && selectionBeforeInput.start <= annotation.end) {\n                        if (selectionBeforeInput.end <= annotation.end) {\n                            annotation.end += diffLength\n                        } else {\n                            annotation.end += selectionAfterInput.start - annotation.end\n                        }\n                    } else if (annotation.start >= selectionBeforeInput.start && annotation.start < selectionBeforeInput.end) {\n\n                        // Part of the annotation is deleted.\n                        inAnnotation = annotation.end - annotation.start\n                        removedInAnnotation = selectionBeforeInput.end - annotation.start\n                        annotation.start = selectionBeforeInput.start\n                        annotation.end = annotation.start + inAnnotation - removedInAnnotation\n\n                    } else if (annotation.start >= selectionBeforeInput.end) {\n                        // Shift all the following annotations by the diff length.\n                        annotation.start += diffLength\n                        annotation.end += diffLength\n                    }\n                    break\n\n\n                case 'delete-insert':\n                    // Delete followed by insert. The user might have selected a range and then started typing or pasting.\n\n                    if (annotation.start <= selectionBeforeInput.start && selectionBeforeInput.start <= annotation.end) {\n                        // If we're deleting something AFTER the annotation, we do now\n                        // want the inserting characters to inherit the annotated properties.\n                        // aBC[d]e -> aBCe   (not aBCE)\n                        if (selectionBeforeInput.start < annotation.end) {\n\n                            if (selectionBeforeInput.end > annotation.end) {\n                                annotation.end = selectionAfterInput.end\n                            } else {\n                                annotation.end = selectionAfterInput.end + (annotation.end - selectionBeforeInput.end)\n                            }\n                        }\n                    } else if (annotation.start >= selectionBeforeInput.start && annotation.start <= selectionBeforeInput.end) {\n\n                        // Part of the annotation is affected.\n                        const addedChars = selectionAfterInput.start - selectionBeforeInput.start\n                        removedInAnnotation = selectionBeforeInput.end - annotation.start\n                        inAnnotation = annotation.end - annotation.start\n                        annotation.start = selectionBeforeInput.start + addedChars\n                        annotation.end = annotation.start + inAnnotation - removedInAnnotation\n\n                    } else if (annotation.start >= selectionBeforeInput.start && annotation.end <= selectionBeforeInput.end) {\n\n                        // This annotation will be removed.\n                        annotation.start = annotation.end = 0\n\n                    } else if (annotation.start >= selectionBeforeInput.end) {\n                        // Shift all the following annotations by the diff length.\n                        annotation.start += diffLength\n                        annotation.end += diffLength\n                    }\n                    break\n\n                default:\n                    // Unknown operation. Should never happen!\n                    if (this.options.debug) {\n                        console.log('ui.TextEditor: Unknown text operation.')\n                    }\n                    break\n            }\n\n            if (annotation.end > annotation.start) {\n                newAnnotations.push(annotation)\n            }\n\n        }, this)\n\n        return newAnnotations\n    },\n\n    shiftAnnotations: function(annotations, selectionStart, offset) {\n\n        return V.shiftAnnotations(annotations, selectionStart, offset)\n    },\n\n    // @public\n    // This method stores annotation attributes that will be used for the very next insert operation.\n    // This is useful, for example, when we have a toolbar and the user changes text to e.g. bold.\n    // At this point, we can just call `setCurrentAnnotation({ 'font-weight': 'bold' })` and let the\n    // text editor know that once the user starts typing, the text should be bold.\n    // Note that the current annotation will be removed right after the first text operation to come.\n    // This is becase after that, the next inserted character will already inherit properties\n    // from the previous character which is our 'bold' text.\n    setCurrentAnnotation: function(attrs) {\n\n        this._currentAnnotationAttributes = attrs\n    },\n\n    // @public\n    // Set annotations of the text inside the text editor.\n    // These annotations will be modified during the course of using the text editor.\n    setAnnotations: function(annotations) {\n\n        this._annotations = annotations\n    },\n\n    // @public\n    getAnnotations: function() {\n\n        return this._annotations\n    },\n\n    // @public\n    // Get the combined (merged) attributes for a character at the position `selectionStart`\n    // taking into account all the `annotations` that apply.\n    getCombinedAnnotationAttrsAtIndex: function(selectionStart, annotations) {\n\n        const attrs = {}\n        joint.util.toArray(annotations).forEach(function(annotation) {\n            if (annotation.start === undefined && annotation.end === undefined) {\n                // The annotation does not have `start` and `end`. Assume it spans\n                // the whole text. This allows us to pass default annotations\n                // for text that is not spanned by any regular annotation.\n                V.mergeAttrs(attrs, annotation.attrs)\n            } else if (selectionStart >= annotation.start && selectionStart < annotation.end) {\n                V.mergeAttrs(attrs, annotation.attrs)\n            }\n        })\n        return attrs\n    },\n\n    // @public\n    // Find a common annotation among all the `annotations` that fall into the\n    // `range` (an object with `start` and `end` properties - *normalized*).\n    // For characters that don't fall into any of the `annotations`, assume\n    // `defaultAnnotation` (default annotation does not need `start` and `end` properties).\n    // The common annotation denotes the attributes that all the characters in the `range` share.\n    // If any of the attributes for any character inside `range` differ, `undefined` is returned.\n    // This is useful e.g. when your toolbar needs to reflect the text attributes of a selection.\n    getSelectionAttrs: function(range, annotations) {\n\n        const {start} = range\n        const {end} = range\n\n        if (start === end && start === 0) {\n            // If the cursor is right at the beginning of the text (and there is *some* text), take\n            // attributes from the first character.\n            return this.getCombinedAnnotationAttrsAtIndex(start, annotations)\n\n        } else if (start === end) {\n            // Nothing is selected. We take attributes of the character before the current caret position.\n            return this.getCombinedAnnotationAttrsAtIndex(start - 1, annotations)\n\n        } else {\n\n            let commonAttrs\n            for (let i = start; i < end; i++) {\n                var attrs = this.getCombinedAnnotationAttrsAtIndex(i, annotations)\n                if (commonAttrs && !joint.util.isEqual(commonAttrs, attrs)) {\n                    // Attributes differ. Remove those that differ from commonAttrs.\n                    commonAttrs = joint.util.flattenObject(V.mergeAttrs({}, commonAttrs))\n                    attrs = joint.util.flattenObject(V.mergeAttrs({}, attrs))\n                    var result = {}\n                    joint.util.forIn(attrs, function(value, key) {\n                        if (commonAttrs[key] === attrs[key]) {\n                            joint.util.setByPath(result, key, value)\n                        }\n                    })\n                    commonAttrs = result\n                } else {\n                    commonAttrs = attrs\n                }\n            }\n            return commonAttrs\n        }\n    },\n\n    // @public\n    // Return the text content (including new line characters) inside the `<text>` SVG element.\n    // We assume that each <tspan> represents a new line in the order in which\n    // they were added to the DOM.\n    getTextContent: function() {\n\n        // Add a newline character for every <tspan> that is a line. Such\n        // tspans must be marked with the `line` class.\n        const elText = this.options.text\n        const tspans = V(elText).find('.v-line')\n        return tspans.length === 0 ? elText.textContent : tspans.reduce(function(memo, tspan, i, tspans) {\n            let line = tspan.node.textContent\n            // Empty lines are assumed to be marked with the `empty-line` class.\n            if (tspan.hasClass('v-empty-line')) line = ''\n            // Last line does not need a new line (\\n) character at the end.\n            return (i === tspans.length - 1) ? memo + line : `${memo + line  }\\n`\n        }, '')\n    },\n\n    startSelecting: function() {\n\n        this.selecting = true\n    },\n\n    stopSelecting: function() {\n\n        this.selecting = false\n    },\n\n    selectionInProgress: function() {\n\n        return this.selecting === true\n    },\n\n    // @public\n    // Select the whole text.\n    selectAll: function() {\n\n        return this.select(0, this.getNumberOfChars())\n    },\n\n    // @public\n    // Select a portion of the text starting at `startCharNum`\n    // character position ending at `selectionEnd` character position.\n    // This method automatically swaps `startCharNum` and `endCharNum`\n    // if they are in the wrong order.\n    select: function(startCharNum, endCharNum) {\n\n        if (this.options.debug) {\n            console.log('select(', startCharNum, endCharNum, ')')\n        }\n\n        if (endCharNum === undefined) {\n            endCharNum = startCharNum\n        }\n\n        if (joint.util.isNumber(startCharNum)) {\n            this.selection.start = startCharNum\n        }\n\n        if (joint.util.isNumber(endCharNum)) {\n            this.selection.end = endCharNum\n        }\n\n        if (!joint.util.isNumber(this.selection.end)) {\n            this.selection.end = this.selection.start\n        }\n\n        if (joint.util.isNumber(this.selection.start) && joint.util.isNumber(this.selection.end)) {\n\n            if (this.selection.start === this.selection.end) {\n                this.clearSelection()\n                this.focus()\n                this.setCaret(this.selection.start)\n            } else {\n                this.hideCaret()\n                this.renderSelection(this.selection.start, this.selection.end)\n            }\n\n            this.trigger('select:change', this.selection.start, this.selection.end)\n        }\n\n        return this\n    },\n\n    setTextAreaSelection: function(start, end) {\n\n        let selection = {\n            start: start,\n            end: end\n        }\n\n        selection = this.normalizeSelectionRange(selection)\n\n        this.textarea.focus()\n        this.textarea.selectionStart = selection.start\n        this.textarea.selectionEnd = selection.end\n    },\n\n    renderSelection: function(start, end) {\n\n        if (this.options.debug) {\n            console.log('renderSelection()')\n        }\n\n        let selection = {\n            start: start,\n            end: end\n        }\n\n        selection = this.normalizeSelectionRange(selection)\n\n        this.clearSelection()\n\n        if (this.options.useNativeSelection) {\n\n            // Use native selection.\n\n            // Allow selection of elements in the paper.\n            if (this.$viewport) {\n\n                // Save this so that it can be reverted later.\n                this._viewportUserSelectBefore = this.$viewport.css('user-select')\n\n                this.$viewport.css({\n                    '-webkit-user-select': 'all',\n                    '-moz-user-select': 'all',\n                    'user-select': 'all'\n                })\n            }\n\n            const length = (selection.end - selection.start)\n\n            this.selectTextInElement(this.options.text, selection.start, length)\n\n        } else {\n\n            // Fallback to the old method of rendering the selection box using a <div> for each character.\n\n            this.renderSelectionBoxes(selection.start, selection.end)\n        }\n    },\n\n    normalizeSelectionStartAndLength: function(text, start, length) {\n\n        const textBefore = text.substr(0, start)\n        const textSelected = text.substr(start, length)\n\n        // Linebreaks aren't counted by the selectSubString() method.\n        const numLineBreaksBefore = this.countLineBreaks(textBefore)\n        const numLineBreaksInSelection = this.countLineBreaks(textSelected)\n\n        start -= numLineBreaksBefore\n        length -= numLineBreaksInSelection\n\n        // \"Empty lines\" contain a hidden hyphen symbol, which are counted.\n        const numEmptyLinesBefore = this.countEmptyLines(textBefore)\n        const numEmptyLinesInSelection = this.countEmptyLines(textSelected)\n\n        start += numEmptyLinesBefore\n        length += numEmptyLinesBefore\n        length -= numEmptyLinesBefore\n        length += numEmptyLinesInSelection\n\n        return {\n            start: start,\n            length: length\n        }\n    },\n\n    selectTextInElement: function(element, start, length) {\n\n        if (joint.util.isFunction(element.selectSubString)) {\n\n            // Try using selectSubString().\n            this.selectTextInElementUsingSelectSubString(element, start, length)\n        }\n\n        // Is the expected selected content is different from the actual selected content?\n        if (!this.actualSelectionMatchesExpectedSelection(start, length)) {\n\n            // Fallback to using ranges.\n\n            try {\n\n                this.selectTextInElementUsingRanges(element, start, length)\n\n            } catch (error) {\n\n                if (this.options.debug) {\n                    console.log(error)\n                }\n\n                if (joint.util.isFunction(element.selectSubString)) {\n                    // Try again using selectSubString().\n                    this.selectTextInElementUsingSelectSubString(element, start, length)\n                }\n            }\n        }\n    },\n\n    selectTextInElementUsingSelectSubString: function(element, start, length) {\n\n        // Note:\n        // When using this method, Firefox doesn't do well when the selection spans multiple <tspan> elements.\n        // In that case only the first <tspan> is selected.\n\n        const normalized = this.normalizeSelectionStartAndLength(this.getTextContent(), start, length)\n\n        try {\n\n            element.selectSubString(normalized.start, normalized.length)\n\n        } catch (error) {\n\n            if (this.options.debug) {\n                console.log(error)\n            }\n        }\n    },\n\n    selectTextInElementUsingRanges: function(element, start, length) {\n\n        // Some browsers (Chrome) don't allow \"discontiguous\" ranges.\n        // A \"discontiguous\" range is a range that includes multiple elements.\n        // This isn't a problem for Firefox.\n\n        const selection = window.getSelection()\n\n        selection.removeAllRanges()\n\n        const normalized = this.normalizeSelectionStartAndLength(this.getTextContent(), start, length)\n\n        start = 0 + normalized.start\n        length = 0 + normalized.length\n\n        const textNodes = this.getTextNodesFromDomElement(element)\n        let textNode\n        let range\n        let textNodeStart\n        let textNodeEnd\n        let setStart\n        let setEnd\n        let offset = 0\n        const end = start + length\n\n        while (length > 0 && textNodes.length > 0) {\n\n            textNode = textNodes.shift()\n            textNodeStart = offset\n            textNodeEnd = offset + textNode.length\n\n            if (\n                (textNodeStart >= start && textNodeStart < end) ||\n                (textNodeEnd > start && textNodeEnd <= end) ||\n                (start >= textNodeStart && start < textNodeEnd) ||\n                (end > textNodeStart && end <= textNodeEnd)\n            ) {\n\n                setStart = Math.max(start - textNodeStart, 0)\n                setEnd = Math.min(setStart + Math.min(length, textNode.length), textNodeEnd)\n                range = document.createRange()\n                range.setStart(textNode, setStart)\n                range.setEnd(textNode, setEnd)\n                selection.addRange(range)\n                length -= (setEnd - setStart)\n            }\n\n            offset += textNode.length\n        }\n    },\n\n    actualSelectionMatchesExpectedSelection: function(start, length) {\n\n        const selection = window.getSelection()\n        let actualSelectedContent = selection.toString()\n        const expectedSelectedContent = this.getExpectedSelectedContent(start, length)\n\n        // Replace tab characters with space characters.\n        actualSelectedContent = actualSelectedContent.replace(/\\s/g, ' ')\n\n        return expectedSelectedContent === actualSelectedContent\n    },\n\n    getExpectedSelectedContent: function(start, length) {\n\n        const textContent = this.getTextContent()\n        let expectedSelectedContent = textContent.substr(start, length)\n\n        // Replace empty lines with a hyphen character.\n        expectedSelectedContent = expectedSelectedContent.replace(/(\\n\\r|\\r|\\n){2,}/g, '-')\n\n        // Remove single line break characters.\n        expectedSelectedContent = expectedSelectedContent.replace(/\\n\\r|\\r|\\n/g, '')\n\n        // Replace tab characters with space characters.\n        expectedSelectedContent = expectedSelectedContent.replace(/\\s/g, ' ')\n\n        return expectedSelectedContent\n    },\n\n    getTextNodesFromDomElement: function(element) {\n\n        let textNodes = []\n\n        for (let i = 0, n = element.childNodes.length; i < n; i++) {\n            const childNode = element.childNodes[i]\n            if (childNode.tagName !== undefined) {\n\n                // Not a text node.\n\n                textNodes = textNodes.concat(this.getTextNodesFromDomElement(childNode))\n\n            } else {\n\n                textNodes.push(childNode)\n            }\n        }\n\n        return textNodes\n    },\n\n    renderSelectionBoxes: function(start, end) {\n\n        if (this.options.debug) {\n            console.log('renderSelectionBoxes()')\n        }\n\n        this.$selection.empty()\n\n        const fontSize = this.getFontSize()\n        const t = this.getTextTransforms()\n        const angle = t.rotation\n\n        // Cache of a previous selection box element.\n        let $prevBox\n        // Cache for a bounding box of a previous character.\n        let prevBbox\n\n        let bbox\n        for (let i = start; i < end; i++) {\n\n            const $box = this.$selectionBox.clone()\n\n            // `getCharBBox()` can throw an exception in situations where\n            // the character position is outside the range where\n            // the `getStartPositionOfChar()` and `getEndPositionOfChar()`\n            // methods can operate. An example of this is a text along a path\n            // that is shorter than that of the text. In this case,\n            // we fail silently. This is safe because the result of this\n            // is selection boxes not being rendered for characters\n            // outside of the visible text area - which is actually desired.\n            try {\n                bbox = this.getCharBBox(i)\n            } catch (e) {\n                this.trigger('select:out-of-range', start, end)\n                break\n            }\n\n            // A small optimization for the number of char-selection-box div elements.\n            // If one box is right after the other, there is no need to render them both.\n            // Instead, simply adjust the width of the previous one.\n            if (prevBbox && angle === 0 && Math.round(bbox.y) === Math.round(prevBbox.y) &&\n                Math.round(bbox.height) === Math.round(prevBbox.height) &&\n                Math.round(bbox.x) === Math.round(prevBbox.x + prevBbox.width)) {\n\n                $prevBox.css({ width: `+=${  bbox.width}` })\n\n            } else {\n\n                // Using font size instead of bbox.height makes the bounding box\n                // of the character more precise. Unfortunately, getting an accurate\n                // bounding box of a character in SVG is not easy.\n                $box.css({\n                    left: bbox.x,\n                    top: bbox.y - bbox.height,\n                    width: bbox.width,\n                    height: bbox.height,\n                    '-webkit-transform': `rotate(${  angle  }deg)`,\n                    '-webkit-transform-origin': '0% 100%',\n                    '-moz-transform': `rotate(${  angle  }deg)`,\n                    '-moz-transform-origin': '0% 100%'\n                })\n                this.$selection.append($box)\n                $prevBox = $box\n            }\n            prevBbox = bbox\n        }\n\n        if (bbox) {\n\n            this.$textareaContainer.css({\n                left: bbox.x,\n                top: bbox.y - fontSize * t.scaleY\n            })\n        }\n    },\n\n    clearSelection: function() {\n\n        if (this.options.debug) {\n            console.log('clearSelection()')\n        }\n\n        this.$selection.empty()\n\n        if (this.options.text.selectSubString) {\n\n            if (this.$viewport && this._viewportUserSelectBefore) {\n                this.$viewport.css({\n                    '-webkit-user-select': this._viewportUserSelectBefore,\n                    '-moz-user-select': this._viewportUserSelectBefore,\n                    'user-select': this._viewportUserSelectBefore\n                })\n            }\n\n            window.getSelection().removeAllRanges()\n        }\n\n        return this\n    },\n\n    // @public\n    // Cancel selection of the text.\n    deselect: function() {\n\n        if (this.options.debug) {\n            console.log('deselect()')\n        }\n\n        this.stopSelecting()\n        this.clearSelection()\n        this.setTextAreaSelection(this.selection.start, this.selection.end)\n\n        return this\n    },\n\n    // @public\n    // Return the start character position of the current selection.\n    getSelectionStart: function() {\n\n        return this.selection.start\n    },\n\n    // @public\n    // Return the end character position of the current selection.\n    getSelectionEnd: function() {\n\n        return this.selection.end\n    },\n\n    // @public\n    // Return an object with `start` and `end` properties describing\n    // the *normalized* selection range.\n    getSelectionRange: function() {\n\n        return this.normalizeSelectionRange(this.selection)\n    },\n\n    normalizeSelectionRange: function(selection) {\n\n        selection = joint.util.clone(selection)\n\n        // Normalize.\n        if (selection.start > selection.end) {\n            selection.end = [selection.start, selection.start = selection.end][0]\n        }\n\n        return selection\n    },\n\n    // @public\n    // Return the length of the selection.\n    getSelectionLength: function() {\n\n        const range = this.getSelectionRange()\n        return range.end - range.start\n    },\n\n    // @public\n    // Return the selected text.\n    getSelection: function() {\n\n        const range = this.getSelectionRange()\n        return this.getTextContent().slice(range.start, range.end)\n    },\n\n    // @public\n    // Return the start and end character positions for a word\n    // under `charNum` character position.\n    getWordBoundary: function(charNum) {\n\n        const text = this.textarea.value\n        const re = /\\W/\n\n        let start = charNum\n        while (start) {\n            if (re.test(text[start])) {\n                start += 1\n                break\n            }\n            start -= 1\n        }\n\n        const numberOfChars = this.getNumberOfChars()\n        let end = charNum\n        while (end <= numberOfChars) {\n            if (re.test(text[end])) {\n                break\n            }\n            end += 1\n        }\n\n        // Normalize before returning.\n        return (start < end) ? [start, end] : [end, start]\n    },\n\n    getURLBoundary: function(charNum) {\n\n        const text = this.textarea.value\n\n        const whitespaceRegEx = /\\s/\n        const weburlRegEx = /[-a-zA-Z0-9@:%_+.~#?&//=]{2,256}\\.[a-z]{2,4}\\b(\\/[-a-zA-Z0-9@:%_+.~#?&//=]*)?/\n        let start = charNum\n        while (start) {\n            if (whitespaceRegEx.test(text[start])) {\n                start += 1\n                break\n            }\n            start -= 1\n        }\n\n        const numberOfChars = this.getNumberOfChars()\n        let end = charNum\n        while (end <= numberOfChars) {\n            if (whitespaceRegEx.test(text[end])) {\n                break\n            }\n            end += 1\n        }\n\n        if (weburlRegEx.test(text.substring(start, end))) {\n            return [start, end]\n        }\n        return undefined\n    },\n\n    annotateURL: function(annotations, selectionStart, selectionEnd) {\n\n        // Include the actual URL with the annotation object. This is very useful to\n        // have for cases where the text does not reflect the URL but rather only the title of the URL.\n        // In this case, we still want to know what was the original URL.\n        const url = this.textarea.value.substring(selectionStart, selectionEnd)\n        const urlAnnotation = joint.util.assign({ url: url }, this.options.urlAnnotation)\n\n        urlAnnotation.start = selectionStart\n        urlAnnotation.end = selectionEnd\n        // Do not add the annotation if there was the exact same\n        // one at the end already.\n        if (!joint.util.isEqual(urlAnnotation, annotations[annotations.length - 1])) {\n            annotations.push(urlAnnotation)\n        }\n\n        return annotations\n    },\n\n    // Get the bounding box (in screen coordinates) of the character\n    // under `charNum` position (the real one, not the SVG one).\n    getCharBBox: function(charNum) {\n\n        // For a newline character (line ending), return a bounding box\n        // that is derived from the previous - non newline - character\n        // and move it to the right of that character.\n        if (this.isLineEnding(charNum)) {\n            const bbox = this.getCharBBox(charNum - 1)\n            //bbox.x = bbox.x + bbox.width + -7;\n            bbox.x = bbox.x2\n            bbox.y = bbox.y2\n            bbox.width = this.options.newlineCharacterBBoxWidth || 10\n            return bbox\n        }\n\n        const svgCharNum = this.realToSvgCharNum(charNum)\n        const elText = this.options.text\n        let startPosition = elText.getStartPositionOfChar(svgCharNum)\n        let endPosition = elText.getEndPositionOfChar(svgCharNum)\n        const extent = elText.getExtentOfChar(svgCharNum)\n\n        startPosition = this.localToScreenCoordinates(startPosition)\n        endPosition = this.localToScreenCoordinates(endPosition)\n\n        const t = this.getTextTransforms()\n        const {x} = startPosition\n        const {y} = startPosition\n        const w = extent.width * t.scaleX\n        const h = extent.height * t.scaleY\n\n        return { x: x, y: y, width: w, height: h, x2: endPosition.x, y2: endPosition.y }\n    },\n\n    realToSvgCharNum: function(charNum) {\n        // Calculate the position of the character in the SVG `<text>` element.\n        // The reason why those two don't match (`charNum` and `svgCharNum`) is\n        // because in the SVG `<text>` element, there are no newline characters.\n        let lineEndings = 0\n        for (let i = 0; i <= charNum; i++) {\n            if (this.isLineEnding(i)) {\n                lineEndings += 1\n            }\n        }\n\n        return charNum - lineEndings\n    },\n\n    selectionStartToSvgCharNum: function(selectionStart) {\n\n        return selectionStart - this.nonEmptyLinesBefore(selectionStart)\n    },\n\n    // Return `true` if the character at the position `charNum` is\n    // a newline character but does not denote an empty line.\n    // In other words, the newline character under `charNum` is\n    // ending a non-empty line.\n    isLineEnding: function(charNum) {\n\n        const text = this.textarea.value\n\n        return text[charNum] === '\\n' && charNum > 0 && text[charNum - 1] !== '\\n'\n    },\n\n    svgToRealCharNum: function(svgCharNum) {\n\n        let newLinesBefore = 0\n        for (let i = 0; i <= svgCharNum + newLinesBefore; i++) {\n            if (this.isLineEnding(i)) {\n                newLinesBefore += 1\n            }\n        }\n        return svgCharNum + newLinesBefore\n    },\n\n    localToScreenCoordinates: function(p) {\n\n        // [IE fix] The text element must be visible, otherwise getCTM() doesn't work.\n        // See:\n        // http://stackoverflow.com/questions/10714779/svgs-node-getscreenctm-method-failing-in-ie-9/10731378#10731378\n        $(this.options.text).show()\n\n        return V.transformPoint(p, this.options.text.getCTM())\n    },\n\n    // @public\n    // Return the number of characters in the text.\n    getNumberOfChars: function() {\n\n        return this.getTextContent().length\n    },\n\n    // @public\n    // Return the character position (the real one) the user clicked on.\n    // If there is no such a position found, return the last one.\n    getCharNumFromEvent: function(evt) {\n\n        const elText = this.options.text\n        const {clientX} = evt\n        const {clientY} = evt\n        const localClientPoint = V(elText).toLocalPoint(clientX, clientY)\n        const svgCharNum = elText.getCharNumAtPosition(localClientPoint)\n\n        // The user clicked somewhere outside, always return the last char num.\n        if (svgCharNum < 0) {\n\n            return this.getNumberOfChars()\n        }\n\n        const clientScreen = this.localToScreenCoordinates(localClientPoint)\n\n        // If the user clicked on the \"left\" side of the character,\n        // return the character position of the clicked character, otherwise\n        // return the character position of the character after the clicked one.\n        const bbox = this.getCharBBox(this.svgToRealCharNum(svgCharNum))\n        if (Math.abs(bbox.x - clientScreen.x) < Math.abs(bbox.x + bbox.width - clientScreen.x)) {\n\n            return this.svgToRealCharNum(svgCharNum)\n        }\n\n        return this.svgToRealCharNum(svgCharNum) + 1\n    },\n\n    lineNumber: function(selectionStart) {\n\n        const text = this.textarea.value.substr(0, selectionStart)\n\n        return this.countLineBreaks(text)\n    },\n\n    emptyLinesBefore: function(selectionStart) {\n\n        const lines = this.textarea.value.split(/\\n\\r|\\r|\\n/g)\n        const lineNumber = this.lineNumber(selectionStart)\n        let n = 0\n        for (let i = lineNumber - 1; i >= 0; i--) {\n            if (!lines[i]) {\n                n += 1\n            }\n        }\n        return n\n    },\n\n    countLineBreaks: function(text) {\n\n        return (text.match(/\\n\\r|\\r|\\n/g) || []).length\n    },\n\n    countEmptyLines: function(text) {\n\n        return (text.match(/(\\n\\r|\\r|\\n){2,}/g) || []).length\n    },\n\n    nonEmptyLinesBefore: function(selectionStart) {\n\n        return this.lineNumber(selectionStart) - this.emptyLinesBefore(selectionStart)\n    },\n\n    isEmptyLine: function(lineNumber) {\n\n        const lines = this.textarea.value.split(/\\n\\r|\\r|\\n/g)\n        return !lines[lineNumber]\n    },\n\n    isEmptyLineUnderSelection: function(selectionStart) {\n\n        const lineNumber = this.lineNumber(selectionStart)\n        return this.isEmptyLine(lineNumber)\n    },\n\n    getTextTransforms: function() {\n\n        const screenCTM = this.options.text.getCTM()\n        return V.decomposeMatrix(screenCTM)\n    },\n\n    getFontSize: function() {\n\n        return parseInt(V(this.options.text).attr('font-size'), 10)\n    },\n\n    getTextAnchor: function() {\n\n        return V(this.options.text).attr('text-anchor') || ''\n    },\n\n    // @public\n    // Set the caret position based on the selectionStart of the textarea unless\n    // `charNum` is provided in which case the caret will be set just before the\n    // character at `charNum` position (starting from 0).\n    setCaret: function(charNum, opt) {\n\n        if (joint.util.isObject(charNum)) {\n            opt = charNum\n            charNum = undefined\n        }\n\n        opt = opt || {}\n\n        const elText = this.options.text\n        const numberOfChars = this.getNumberOfChars()\n        let selectionStart = this.selection.start\n        const text = this.textarea.value\n\n        if (typeof charNum !== 'undefined') {\n\n            // Keep the character number within the valid range of characters.\n            charNum = Math.min(Math.max(charNum, 0), numberOfChars)\n\n            selectionStart = this.selection.start = this.selection.end = charNum\n        }\n\n        if (!opt.silent) {\n            this.trigger('caret:change', selectionStart)\n        }\n\n        this.setTextAreaSelection(selectionStart, selectionStart)\n\n        if (this.options.debug) {\n            console.log('setCaret(', charNum, opt, ')', 'selectionStart', selectionStart, 'isLineEnding', this.isLineEnding(selectionStart), 'isEmptyLineUnderSelection', this.isEmptyLineUnderSelection(selectionStart), 'svgCharNum', this.selectionStartToSvgCharNum(selectionStart), 'nonEmptyLinesBefore', this.nonEmptyLinesBefore(selectionStart))\n        }\n\n        let caretPosition\n\n        // `getStartPositionOfChar()` or `getEndPositionOfChar()` can throw an exception\n        // in situations where the character position is outside the range of\n        // the visible text area. In this case, we just hide the caret altogether -\n        // which is desired because the user is editing a text that is not visible.\n        // An example of this is a text along a path that is shorter than that of the text.\n        try {\n\n            let charIndex\n\n            // - If we're on an empty line, always take the start position of the\n            //   SVG space character on that line.\n            // - If we're at the end of the line, take the end position of the SVG character before.\n            // - If we're at the end of the text, also take the end position of the character before.\n            // - For all other cases, take the start position of the SVG character before the selection.\n            if (!this.isEmptyLineUnderSelection(selectionStart) && (this.isLineEnding(selectionStart) || text.length === selectionStart)) {\n\n                charIndex = this.selectionStartToSvgCharNum(selectionStart) - 1\n                caretPosition = elText.getEndPositionOfChar(charIndex)\n\n            } else {\n\n                charIndex = this.selectionStartToSvgCharNum(selectionStart)\n                caretPosition = elText.getStartPositionOfChar(charIndex)\n            }\n\n        } catch (e) {\n\n            this.trigger('caret:out-of-range', selectionStart)\n\n            caretPosition = {\n                x: 0,\n                y: 0\n            }\n        }\n\n        // Convert the caret local position (in the coordinate system of the SVG `<text>`)\n        // into screen coordinates.\n        const caretScreenPosition = this.localToScreenCoordinates(caretPosition)\n\n        // Set the position of the caret. If the number of characters is zero, the caretPosition\n        // is `{ x: 0, y: 0 }`, therefore it is not the the bottom right corner of the character but\n        // the top left. Therefore, we do not want to shift the caret up using the `margin-top` property.\n        const t = this.getTextTransforms()\n        const angle = t.rotation\n        // TODO: fontSize should be based on the actual font size of the character\n        // under the cursor, not the text global font size. This will improve\n        // UX for rich text.\n        const fontSize = this.getFontSize() * t.scaleY\n\n        if (this.options.placeholder) {\n            this.$caret.toggleClass('placeholder', numberOfChars === 0)\n        }\n\n        this.$caret.css({\n            left: caretScreenPosition.x,\n            top: caretScreenPosition.y + (numberOfChars ? -fontSize : 0),\n            height: fontSize,\n            'line-height': `${fontSize  }px`,\n            'font-size': `${fontSize  }px`,\n            '-webkit-transform': `rotate(${  angle  }deg)`,\n            '-webkit-transform-origin': '0% 100%',\n            '-moz-transform': `rotate(${  angle  }deg)`,\n            '-moz-transform-origin': '0% 100%'\n        }).attr({\n            'text-anchor': this.getTextAnchor()\n        }).show()\n\n        this.$textareaContainer.css({\n            left: caretScreenPosition.x,\n            top: caretScreenPosition.y + (numberOfChars ? -fontSize  : 0)\n        })\n\n        // Always focus. If the caret was set as a reaction on\n        // mouse click, the textarea looses focus in FF.\n        this.focus()\n\n        return this\n    },\n\n    focus: function() {\n\n        if (this.options.debug) {\n            console.log('focus()')\n        }\n\n        this.showCaret()\n\n        return this\n    },\n\n    blur: function() {\n\n        if (this.options.debug) {\n            console.log('blur()')\n        }\n\n        this.hideCaret()\n\n        return this\n    },\n\n    showCaret: function() {\n\n        if (this.options.debug) {\n            console.log('showCaret()')\n        }\n\n        this.$caret.show()\n\n        return this\n    },\n\n    // @public\n    // Hide the caret (cursor).\n    hideCaret: function() {\n\n        if (this.options.debug) {\n            console.log('hideCaret()')\n        }\n\n        this.$caret.hide()\n\n        return this\n    },\n\n    unbindTextElement: function() {\n\n        this.$elText.off('mousedown', this.onMousedown)\n        this.$elText.off('dblclick', this.onDoubleClick)\n        this.$elText.off('click', this.onTripleClick)\n    },\n\n    onRemove: function() {\n\n        this.deselect()\n        this.unbindTextElement()\n\n        $(document.body).off('mousemove', this.onMousemove)\n        $(document.body).off('mouseup', this.onMouseup)\n        $(document.body).off('keydown', this.onKeydown)\n\n        // TODO: Optional?\n        V(this.options.text).attr('cursor', '')\n    }\n\n}, joint.util.assign({\n\n    // A tiny helper that checks if `el` is an SVG `<text>` or `<tspan>` element\n    // and returns it if yes, otherwise it returns `undefined`.\n    // Especially useful when working with events, e.g.:\n    // $(document.body).on('click', function(evt) {\n    //     var t = joint.ui.TextEditor.getTextElement(evt.target);\n    //     if (t) { ... } else { ... }\n    // })\n    getTextElement: function(el) {\n\n        const tagName = el.tagName.toUpperCase()\n\n        if (tagName === 'TEXT' || tagName === 'TSPAN' || tagName === 'TEXTPATH') {\n\n            if (tagName === 'TEXT') return el\n            return this.getTextElement(el.parentNode)\n        }\n\n        return undefined\n    },\n\n    // @public\n    // Start inline editing an SVG text element. Therefore, `el` should always\n    // be either an SVG `<text>` element directly or any of its descendants\n    // `<tspan>` or `<textpath>` in which case the text editor automatically\n    // finds the nearest `<text>` element climbing up the DOM tree.\n    // If it can't find any `<text>` element, an error is printed to the console\n    // and `undefined` is returned. Otherwise, the instance of the `ui.TextEditor`\n    // is returned.\n    // Options:\n    // `opt.placeholder` ... Placeholder that will be passed to the `ui.TextEditor` instance.\n    // `opt.annotations` ... Annotations that will be set on the `ui.TextEditor` instance.\n    // `opt.cellView` ... For simplicity, we add direct support for JointJS cells.\n    // `opt.annotationsProperty` ... If `opt.cellView` is used, annotations will be looked up and set from/to the cellView model by this property name.\n    // `opt.textProperty` ... If `opt.cellView` is used, text will be set to the cellView model to this property name.\n    edit: function(el, opt) {\n\n        opt = opt || {}\n\n        // By default, the text editor automatically updates either the cellView text string\n        // and annotations (if `opt.cellView` is used) or the SVG text element via Vectorizer.\n        // This behaviour can be supressed by passing `update: false` in the options.\n        // In that case, it is the responsibility of the programmer to update the text and annotations.\n        const update = opt.update !== false\n\n        this.options = joint.util.assign({}, opt, { update: update })\n\n        let textElement = this.getTextElement(el)\n\n        if (!textElement) {\n\n            if (this.options.debug) {\n                console.log('ui.TextEditor: cannot find a text element.')\n            }\n\n            return undefined\n        }\n\n        // If there was another active text editor open, close it first.\n        this.close()\n\n        this.ed = new joint.ui.TextEditor(joint.util.assign({ text: textElement }, opt))\n\n        // Proxy all events triggered by the `ui.TextEditor` to all the listeners\n        // on the `ui.TextEditor` class singleton.\n        this.ed.on('all', this.trigger, this)\n\n        // The target container to render the `ui.TextEditor` instance into.\n        // If `opt.cellView` is used, the `paper.el` will be used, otherwise the parent node\n        // of the SVG document which our `textElement` resides will be used.\n        let target\n\n        // Add support for JointJS cells to make integration easier.\n        if (opt.cellView) {\n\n            target = opt.cellView.paper.el\n\n            this.cellViewUnderEdit = opt.cellView\n            // Prevent dragging during inline editing.\n            this.cellViewUnderEditInteractiveOption = this.cellViewUnderEdit.options.interactive\n            this.cellViewUnderEdit.options.interactive = false\n\n            // Set annotations by the property name. Look them up from the cellView model.\n            if (opt.annotationsProperty && !this.ed.getAnnotations()) {\n\n                const annotations = this.cellViewUnderEdit.model.prop(opt.annotationsProperty)\n                if (annotations) {\n                    // Note that we have to deep clone the annotations so that\n                    // all the backbone `changed` mechanism works. This is because\n                    // the text editor modifies the `annotations` array in-place.\n                    this.ed.setAnnotations(this.deepCloneAnnotations(annotations))\n                }\n            }\n\n        } else {\n\n            const svg = V(textElement).svg()\n            target = svg.parentNode\n        }\n\n        if (update) {\n\n            this.ed.on('text:change', function(newText, oldText, annotations) {\n\n                if (opt.cellView) {\n\n                    // The index of a link label in the DOM. The problem with links is that\n                    // when we update through prop() below, all the old labels are removed from DOM\n                    // and replaced with new SVG text elements. This, however, causes the text editor\n                    // to hold (and work with) the old SVG text element. To solve this, we remember\n                    // the index of the label under edit and reset the text element on the text\n                    // editor to point to the newly rendered label SVG text. (see below)\n                    let originalLabelIndex = null\n\n                    // If `opt.cellView` is used, we automatically set the new text and\n                    // annotations to the property defined in our options.\n                    if (opt.textProperty) {\n\n                        if (opt.cellView.model.isLink() && opt.textProperty.substr(0, 'labels'.length) === 'labels') {\n                            originalLabelIndex = V($(V(textElement).node).closest('.label')[0]).index()\n                        }\n\n                        opt.cellView.model.prop(opt.textProperty, newText, { textEditor: this.ed.cid })\n\n                    }\n                    if (opt.annotationsProperty) {\n                        // Note that we have to deep clone the annotations so that\n                        // all the backbone `changed` mechanism works. This is because\n                        // the text editor modifies the `annotations` array in-place.\n                        opt.cellView.model.prop(opt.annotationsProperty, this.deepCloneAnnotations(annotations), { rewrite: true, textEditor: this.ed.cid })\n                    }\n\n                    if (originalLabelIndex !== null) {\n                        // Now we replace the text element stored in the text editor with the\n                        // newly rendered SVG text element.\n                        const labelElements = V(opt.cellView.el).find('.label')\n                        textElement = labelElements[originalLabelIndex].findOne('text')\n                        this.ed.setTextElement(textElement.node)\n                    }\n\n                } else {\n\n                    V(textElement).text(newText, annotations)\n                }\n            }, this)\n        }\n\n        this.ed.render(target)\n\n        return this\n    },\n\n    close: function() {\n\n        if (this.ed) {\n\n            if (this.ed.options.annotateUrls) {\n                // If there is a URL detected before we leave the text-editing,\n                // annotate it. The only exception is if there was already a URL annotation\n                // at the cursor. In this case, we don't create another one.\n                const selectionStart = this.ed.getSelectionStart()\n                const annotationsUnderCursor = this.findAnnotationsUnderCursor()\n                const containsURLAnnotation = annotationsUnderCursor.find(function(annotation) {\n                    if (annotation.url) return annotation\n                    return false\n                })\n                if (!containsURLAnnotation) {\n                    const annotated = this.ed.annotateURLBeforeCaret(selectionStart)\n                    if (annotated) {\n                        this.applyAnnotations(this.getAnnotations())\n                    }\n                }\n            }\n\n            this.ed.remove()\n\n            if (this.cellViewUnderEdit) {\n                // Re-enable dragging after inline editing.\n                this.cellViewUnderEdit.options.interactive = this.cellViewUnderEditInteractiveOption\n            }\n            this.ed = this.cellViewUnderEdit = this.cellViewUnderEditInteractiveOption = undefined\n        }\n    },\n\n    applyAnnotations: function(annotations) {\n\n        const opt = this.options\n\n        if (this.ed && opt.update) {\n\n            if (opt.cellView && opt.annotationsProperty) {\n\n                // Note that we have to deep clone the annotations so that\n                // all the backbone `changed` mechanism works. This is because\n                // the text editor modifies the `annotations` array in-place.\n                opt.cellView.model.prop(opt.annotationsProperty, this.deepCloneAnnotations(annotations), { rewrite: true })\n                this.ed.setAnnotations(annotations)\n\n            } else {\n\n                V(this.ed.options.text).text(this.ed.getTextContent(), annotations)\n            }\n\n            // Refresh the selection boxes or the caret position after\n            // the annotations are applied.\n            const range = this.getSelectionRange()\n            const selectionLength = this.getSelectionLength()\n            if (selectionLength > 0) {\n                this.ed.select(range.start, range.end)\n            } else {\n                this.ed.setCaret()\n            }\n        }\n    },\n\n    // @private\n    deepCloneAnnotations: function(annotations) {\n\n        // JSON.parse/stringify is still the fastest\n        // way of deep cloning objects. See http://jsperf.com/lodash-deepclone-vs-jquery-extend-deep/5.\n        try {\n            return JSON.parse(JSON.stringify(annotations))\n        } catch (e) {\n            return undefined\n        }\n    },\n\n    // Proxy useful methods to the active `ui.TextEditor` instance.\n\n    proxy: function(method, args) {\n\n        if (this.ed) {\n            return this.ed[method].apply(this.ed, args)\n        }\n    },\n\n    setCurrentAnnotation: function(attributes) {\n\n        return this.proxy('setCurrentAnnotation', arguments)\n    },\n\n    getAnnotations: function() {\n\n        return this.proxy('getAnnotations', arguments)\n    },\n\n    setCaret: function() {\n\n        return this.proxy('setCaret', arguments)\n    },\n\n    deselect: function() {\n\n        return this.proxy('deselect', arguments)\n    },\n\n    selectAll: function() {\n\n        return this.proxy('selectAll', arguments)\n    },\n\n    select: function() {\n\n        return this.proxy('select', arguments)\n    },\n\n    getNumberOfChars: function() {\n\n        return this.proxy('getNumberOfChars', arguments)\n    },\n\n    getCharNumFromEvent: function() {\n\n        return this.proxy('getCharNumFromEvent', arguments)\n    },\n\n    getWordBoundary: function() {\n\n        return this.proxy('getWordBoundary', arguments)\n    },\n\n    // A proxy to our active `ui.TextEditor` instance.\n    findAnnotationsUnderCursor: function() {\n\n        return this.proxy('findAnnotationsUnderCursor', [this.ed.getAnnotations(), this.ed.getSelectionStart()])\n    },\n\n    findAnnotationsInSelection: function() {\n\n        if (!this.ed) return\n\n        // Get the *normalized* selection range.\n        const range = this.ed.getSelectionRange()\n        return this.proxy('findAnnotationsInSelection', [this.ed.getAnnotations(), range.start, range.end])\n    },\n\n    getSelectionAttrs: function(annotations) {\n\n        if (!this.ed) return\n        const range = this.ed.getSelectionRange()\n        return this.proxy('getSelectionAttrs', [range, annotations])\n    },\n\n    getSelectionLength: function() {\n\n        return this.proxy('getSelectionLength', arguments)\n    },\n\n    getSelectionRange: function() {\n\n        return this.proxy('getSelectionRange', arguments)\n    }\n\n}, Backbone.Events))\n\njoint.ui.Dialog = joint.mvc.View.extend({\n\n    className: 'dialog',\n\n    events: {\n        'click .bg': 'action',\n        'click .btn-close': 'action',\n        'click .controls button': 'action',\n        'mousedown .titlebar': 'onDragStart',\n        'touchstart .titlebar': 'onDragStart'\n    },\n\n    options: {\n        draggable: false,\n        closeButtonContent: '&times;',\n        closeButton: true,\n        inlined: false,\n        modal: true,\n        width: 0,\n        title: '',\n        buttons: null,\n        type: '',\n        content: null\n    },\n\n    init: function() {\n\n        joint.util.bindAll(this, 'onDrag', 'onDragEnd')\n\n        this.buttons = this.options.buttons\n    },\n\n    render: function() {\n\n        const $bg = $('<div/>', { class: 'bg', 'data-action': 'close' })\n        const $fg = $('<div/>', { class: 'fg' })\n        const $titlebar = $('<div/>', { class: 'titlebar' })\n        const $body = $('<div/>', { class: 'body' })\n        const $btnClose = $('<button/>', { class: 'btn-close', 'data-action': 'close', html: this.options.closeButtonContent })\n        const $controls = $('<div/>', { class: 'controls' })\n\n        this.$el.toggleClass('draggable', !!this.options.draggable)\n\n        if (this.options.type) {\n            this.$el.attr('data-type', this.options.type)\n        }\n\n        if (this.options.inlined) {\n            this.$el.addClass('inlined')\n        }\n\n        if (this.options.modal) {\n            this.$el.addClass('modal')\n        }\n\n        if (this.options.width) {\n            $fg.width(this.options.width)\n        }\n\n        if (this.options.title) {\n            $titlebar.append(this.options.title)\n        } else {\n            $titlebar.addClass('empty')\n        }\n\n        if (this.options.content) {\n            $body.append(this.options.content)\n        }\n\n        if (this.buttons) {\n\n            const rightButtons = []\n            const centerButtons = []\n            const leftButtons = []\n\n            this.buttons.forEach(function(button) {\n\n                const $button = $('<button/>', {\n                    class: 'control-button',\n                    html: button.content,\n                    'data-action': button.action\n                })\n\n                // currently, 'left' and 'center' positions are supported\n                // float right by default\n\n                if (!button.position) {\n                    rightButtons.push($button)\n\n                } else if (button.position === 'left') {\n                    $button.addClass(button.position)\n                    leftButtons.push($button)\n\n                } else if (button.position === 'center') {\n                    $button.addClass(button.position)\n                    centerButtons.push($button)\n\n                } else {\n                    $button.addClass(button.position)\n                    rightButtons.push($button)\n                }\n            })\n\n            // need to be first, to make rightmost button CSS selector work\n            // right buttons, in reverse order\n            // on screen, this places the first provided button leftmost\n            rightButtons.reverse().forEach(function($button) {\n                $controls.append($button)\n            })\n\n            // left buttons, in order\n            // on screen, this places the first provided button leftmost\n            leftButtons.forEach(function($button) {\n                $controls.append($button)\n            })\n\n            // center buttons, in order\n            // on screen, this places the first provided button leftmost\n            centerButtons.forEach(function($button) {\n                $controls.append($button)\n            })\n        }\n\n        $fg.append($titlebar, $body, $controls)\n\n        if (this.options.closeButton) {\n            $fg.append($btnClose)\n        }\n\n        this.$el.empty().append($bg, $fg)\n\n        return this\n    },\n\n    open: function(el) {\n\n        // Events might have been undelegated by a previous `close()` call.\n        this.delegateEvents()\n\n        this.on('action:close', this.close, this)\n\n        $(document.body).on({\n            'mousemove.dialog touchmove.dialog': this.onDrag,\n            'mouseup.dialog touchend.dialog': this.onDragEnd\n        })\n\n        $(el || document.body).append(this.render().el)\n\n        this.$el.addClass('rendered')\n        return this\n    },\n\n    close: function() {\n\n        this.remove()\n        return this\n    },\n\n    onRemove: function() {\n\n        $(document.body).off('.dialog', this.onDrag).off('.dialog', this.onDragStart)\n    },\n\n    action: function(evt) {\n\n        const $button = $(evt.target).closest('[data-action]')\n        const action = $button.attr('data-action')\n        if (action) {\n\n            this.trigger(`action:${  action}`)\n        }\n    },\n\n    onDragStart: function(evt) {\n\n        if (this.options.draggable) {\n\n            evt = joint.util.normalizeEvent(evt)\n\n            this._dx = evt.clientX\n            this._dy = evt.clientY\n            this._dragging = true\n        }\n    },\n\n    onDrag: function(evt) {\n\n        if (this._dragging) {\n\n            evt = joint.util.normalizeEvent(evt)\n\n            const $fg = this.$('.fg')\n            const offset = $fg.offset()\n            $fg.css({\n                top: offset.top + (evt.clientY - this._dy),\n                left: offset.left + (evt.clientX - this._dx),\n                margin: 0\n            })\n\n            this._dx = evt.clientX\n            this._dy = evt.clientY\n        }\n    },\n\n    onDragEnd: function() {\n\n        this._dragging = false\n    }\n\n})\n\njoint.ui.FlashMessage = joint.ui.Dialog.extend({\n\n    className: `${joint.ui.Dialog.prototype.className  } flash-message`,\n\n    options: joint.util.merge({}, joint.ui.Dialog.prototype.options, {\n        closeButton: true,\n        modal: false,\n        cascade: true,\n        closeAnimation: {\n            delay: 2000,\n            duration: 200,\n            easing: 'swing',\n            properties: {\n                opacity: 0\n            }\n        },\n        openAnimation: {\n            duration: 200,\n            easing: 'swing',\n            properties: {\n                opacity: 1\n            }\n        }\n    }),\n\n    init: function() {\n\n        joint.util.bindAll(this, 'startCloseAnimation')\n\n        joint.ui.Dialog.prototype.init.apply(this, arguments)\n\n        this.on('close:animation:complete', this.close, this)\n    },\n\n    open: function() {\n\n        joint.ui.Dialog.prototype.open.apply(this, arguments)\n\n        // Store foreground height for later use.\n        const $fg = this.$('.fg')\n        this._foregroundHeight = $fg.height()\n\n        this.addToCascade()\n\n        $fg.css('height', 0)\n        this.startOpenAnimation()\n\n        if (this.options.closeAnimation && this.options.closeAnimation.delay) {\n\n            setTimeout(this.startCloseAnimation, this.options.closeAnimation.delay)\n        }\n\n        return this\n    },\n\n    close: function() {\n\n        joint.ui.Dialog.prototype.close.apply(this, arguments)\n\n        this.removeFromCascade()\n\n        return this\n    },\n\n    addToCascade: function() {\n\n        if (this.options.cascade) {\n\n            const {top} = this.constructor\n            this.$('.fg').css('top', top)\n            this.constructor.top += this._foregroundHeight + this.constructor.padding\n        }\n\n        this.constructor.opened.push(this)\n    },\n\n    removeFromCascade: function() {\n\n        if (this.options.cascade) {\n\n            // Update top coordinate of all the cascading flash messages after me.\n            const openedFlashMessages = this.constructor.opened\n            let isAfter = false\n            for (let i = 0; i < openedFlashMessages.length; i++) {\n                const opened = openedFlashMessages[i]\n                if (opened.options.cascade && isAfter) {\n                    const openedTop = parseInt(opened.$('.fg').css('top'), 10)\n                    opened.$('.fg').css('top', openedTop - this._foregroundHeight - this.constructor.padding)\n                }\n                if (opened === this) {\n                    isAfter = true\n                }\n            }\n\n            if (isAfter) {\n                // Only decrease the height if this flash messages is in the\n                // opened list. It could be that someone called close() multiple times\n                // and that would take `top` to negative numbers.\n                this.constructor.top -= (this._foregroundHeight + this.constructor.padding)\n            }\n        }\n\n        this.constructor.opened = joint.util.without(this.constructor.opened, this)\n    },\n\n    startCloseAnimation: function() {\n\n        this.$('.fg').animate(this.options.closeAnimation.properties, joint.util.assign({\n\n            complete: function() {\n\n                this.trigger('close:animation:complete')\n\n            }.bind(this)\n\n        }, this.options.closeAnimation))\n    },\n\n    startOpenAnimation: function() {\n\n        const $fg = this.$('.fg')\n        $fg.animate(joint.util.assign({}, this.options.openAnimation.properties, { height: this._foregroundHeight }), joint.util.assign({\n\n            complete: function() {\n\n                this.trigger('open:animation:complete')\n\n            }.bind(this)\n\n        }, this.options.openAnimation))\n    }\n}, {\n\n    // @private Top coordinate of the next flash message. If they are configured as `cascade`, they will stack on top of the other.\n    top: 20,\n\n    // @public Global padding between flash messages.\n    padding: 15,\n\n    // @private List of all opened flash messages.\n    opened: [],\n\n    // @public\n    open: function(content, title, opt) {\n\n        opt = opt || {}\n\n        return new joint.ui.FlashMessage(joint.util.assign({\n            title: title,\n            type: 'info',\n            content: content\n        }, opt)).open(opt.target)\n    },\n\n    close: function() {\n\n        joint.util.invoke(this.opened, 'close')\n    }\n});\n\n(function(joint, Backbone) {\n    \n\n    /**\n     * @constructor\n     */\n    const Keyboard = function() {\n\n        joint.util.bindAll(this, 'handleKey')\n        this.parser = new KeyboardParser()\n        this.enable()\n    }\n\n    joint.util.assign(Keyboard.prototype, Backbone.Events)\n\n    /**\n     * Bind a callback function to an object. Same logic as [Backbone.Events.on](http://backbonejs.org/#Events-on)\n     * @public\n     * @param {string|object} evt shortcut definition\n     *  * string:  [type:]value,\n     *\n     * where event is defined as [type:]value\n     * * type: keypress, keydown, keyup\n     * * value: modifier+char\n     *\n     * supported modifiers definition:\n     * '⇧', 'shift', '⌥', 'alt', 'option', '⌃', 'ctrl', 'control', '⌘', 'command', 'meta'\n     *\n     * for special characters use this definitions:\n     * **backspace, tab, clear, enter, return, esc, escape, space, left, up, right, down, del, delete, home, end, pageup, pagedown, plus**\n     * ```javascript\n     *  //simple shortcut\n     *  keyboardInstance.on('backspace', handleDelete, this);\n     *  // more multiple shortcut definition\n     *  keyboardInstance.on('ctr+c command+c', copy);\n     *  //event as object\n     *  keyboardInstance.on({\n     *      'keyup:a': handlerA\n     *      'b': handlerB\n     *  }, copy);\n     * ```\n     * @param {function} callback Ignored when event is defined as an object\n     * @param {Object=} context\n     * @returns {Keyboard}\n     */\n    Keyboard.prototype.on = function(evt, callback, context) {\n\n        Backbone.Events.on.call(this, this.normalizeEvent(evt), callback, context)\n        return this\n    }\n\n    /**\n     * Remove a previously-bound callback function from an object. Same logic as [Backbone.Events.off](http://backbonejs.org/#Events-off)\n     * @public\n     * @param {string|Object} evt\n     * @param {function} callback\n     * @param {Object=} context\n     * @returns {Keyboard}\n     */\n    Keyboard.prototype.off = function(evt, callback, context) {\n\n        const remove = evt ? this.normalizeEvent(evt) : null\n        Backbone.Events.off.call(this, remove, callback, context)\n        return this\n    }\n\n    /**\n     * @private\n     * @param {string|Object} evt\n     * @returns {*}\n     */\n    Keyboard.prototype.normalizeEvent = function(evt) {\n\n        if (typeof evt === 'object') {\n\n            const keys = Object.keys(evt)\n            const res = {}\n            for (let i = 0, n = keys.length; i < n; i++) {\n                const key = keys[i]\n                res[this.normalizeEvent(key)] = evt[key]\n            }\n\n            return  res\n        }\n\n        return this.normalizeShortcut(evt)\n    }\n\n    /**\n     * Normalize shortcut definition:\n     * split multiple shortcut definition into parts  'ctrl+c alt+a' => 'ctrl+c', 'alt+a'\n     * normalize parts: ctr +c, ctrl + c, c+ctrl => ctrl+c\n     * hash parts\n     * @private\n     * @param {string} shortcut\n     * @returns {string}\n     */\n    Keyboard.prototype.normalizeShortcut = function(shortcut) {\n\n        if (shortcut.toLowerCase() === 'all') {\n            return shortcut\n        }\n\n        const eventsToBind = this.parser.toEventObjectList(shortcut)\n        const result = []\n\n        for (let i = 0; i < eventsToBind.length; i++) {\n            result.push(this.hash(eventsToBind[i]))\n        }\n\n        return result.join(' ')\n    }\n\n    /**\n     * Starts tracking keyboard events.\n     * @public\n     */\n    Keyboard.prototype.enable = function() {\n\n        if (window.addEventListener) {\n            document.addEventListener('keydown', this.handleKey, false)\n            document.addEventListener('keypress', this.handleKey, false)\n            document.addEventListener('keyup', this.handleKey, false)\n        } else if (window.attachEvent) {\n            document.attachEvent('keydown', this.handleKey, false)\n            document.attachEvent('keypress', this.handleKey, false)\n            document.attachEvent('keyup', this.handleKey, false)\n        }\n    }\n\n    /**\n     * Stops tracking keyboard events.\n     * @public\n     */\n    Keyboard.prototype.disable = function() {\n\n        if (window.removeEventListener) {\n            document.removeEventListener('keydown', this.handleKey, false)\n            document.removeEventListener('keypress', this.handleKey, false)\n            document.removeEventListener('keyup', this.handleKey, false)\n        } else if (window.detachEvent) {\n            document.detachEvent('keydown', this.handleKey, false)\n            document.detachEvent('keypress', this.handleKey, false)\n            document.detachEvent('keyup', this.handleKey, false)\n        }\n    }\n\n    /**\n     * Checks if key 'name' is actually pressed.\n     * Limitation: available for modifiers only - 'alt', 'ctrl', 'shift', 'command'\n     * @public\n     * @param {string} name\n     * @param {KeyboardEvent} evt\n     * @returns {boolean}\n     */\n    Keyboard.prototype.isActive = function(name, evt) {\n        return this.isModifierActive(name, evt)\n    }\n\n    /**\n     * @private\n     * @param {string} key\n     * @param {KeyboardEvent} evt\n     * @returns {boolean}\n     */\n    Keyboard.prototype.isModifierActive = function(key, evt) {\n\n        const events = this.parser.toEventObjectList(key)\n\n        for (let i = 0; i < events.length; i++) {\n            if (events[i].modifiersCompare(evt)) {\n                return true\n            }\n        }\n\n        return false\n    }\n\n    /**\n     * @private\n     * @param {KeyboardEvent} evt\n     * @returns {string}\n     */\n    Keyboard.prototype.hash = function(evt) {\n\n        const toInt = function(value) {\n            return value ? 1 : 0\n        }\n\n        const parts = [\n            evt.type, ':',\n            evt.which,\n            toInt(evt.shiftKey),\n            toInt(evt.ctrlKey),\n            toInt(evt.altKey),\n            toInt(evt.metaKey)\n        ]\n\n        return parts.join('')\n    }\n\n    /**\n     * @private\n     * @param {KeyboardEvent} evt\n     */\n    Keyboard.prototype.handleKey = function(evt) {\n\n        if (this.isUnsupportedElement(evt)) {\n            return\n        }\n\n        const ev = KeyboardEvent.fromNative(evt)\n        Backbone.Events.trigger.call(this, this.hash(ev), evt)\n    }\n\n    /**\n     * @private\n     * @param {KeyboardEvent} evt\n     * @returns {boolean}\n     */\n    Keyboard.prototype.isUnsupportedElement = function(evt) {\n\n        const element = evt.target || evt.srcElement\n        if (element) {\n            const tagName = element.tagName.toUpperCase()\n            return tagName === 'INPUT' || tagName === 'SELECT' || tagName === 'TEXTAREA' || element.isContentEditable\n        }\n\n        return false\n    }\n\n    /**\n     * @constructor\n     * @private\n     */\n    var KeyboardParser = function() {\n\n    }\n\n    KeyboardParser.prototype = {\n\n        constructor: KeyboardParser,\n\n\n        /**\n         * @public\n         * @param {string} str\n         * @returns {Object}\n         */\n        parseEventString: function(str) {\n\n            str = str || ''\n            const parts = str.split('+')\n            let strPart\n            const event = new KeyboardEvent(0)\n            let i\n\n            for (i = 0; i < parts.length; i++) {\n                strPart = parts[i]\n                const modifierName = this.getModifierPropertyName(strPart)\n\n                if (modifierName) {\n                    event[modifierName] = true\n                }\n\n                if (parts.length === 1 || modifierName === undefined) {\n                    event.which = KeyboardParser.getCode(strPart)\n                }\n            }\n            return event\n        },\n\n        /**\n         * @public\n         * @param {string} str\n         */\n        toEventObjectList: function(str) {\n\n            //remove white space(s) surrounding '+'\n            // ctrl +   c => ctrl+c\n            const rawEventsParts = str.replace(/\\s*\\+\\s*/gi, '+').split(' ')\n\n            return rawEventsParts.map(this.composeEventObject, this)\n        },\n\n        /**\n         * @private\n         * @param {string} rawEvent\n         * @returns {Object}\n         */\n        composeEventObject: function(rawEvent) {\n\n            const parts = rawEvent.split(':')\n            let type = Types.KEYDOWN\n            let shortcutValue = parts[0]\n\n            if (parts.length > 1) {\n                shortcutValue = parts[1]\n                type = parts[0]\n            }\n\n            if (AvailableEventTypes.indexOf(type) === -1) {\n                throw `${rawEvent  }: invalid shortcut definition`\n            }\n\n            const ev = this.parseEventString(shortcutValue)\n\n            // to treat modifier also as a regular keystroke we need to switch of the modifier activity flag for the keyup event.\n            if (type === Types.KEYUP && modifierMap[ev.which] ) {\n                ev[modifierMap[ev.which]] = false\n            }\n\n            return ev.setType(type)\n        },\n\n        /**\n         * @private\n         * @param {string} key\n         * @returns {*}\n         */\n        getModifierPropertyName: function(key) {\n\n            const code = modifier[key]\n            return modifierMap[code]\n        }\n    }\n\n    /**\n     * @static\n     * @param {string} char\n     * @returns {number}\n     */\n    KeyboardParser.getCode  = function(char) {\n        return keyMap[char] || char.toUpperCase().charCodeAt(0)\n    }\n\n    var modifier = {\n        '⇧': 16, shift: 16,\n        '⌥': 18, alt: 18, option: 18,\n        '⌃': 17, ctrl: 17, control: 17,\n        '⌘': 91, command: 91, meta: 91\n    }\n\n    var modifierMap = {\n        16: 'shiftKey',\n        18: 'altKey',\n        17: 'ctrlKey',\n        91: 'metaKey'\n    }\n\n    const charCodeAlternatives = {\n\n        226: '\\\\',\n\n        // Opera\n        57392: 'ctrl',\n        63289: 'num',\n        // Firefox\n        59: ';',\n        61: '=',\n        173: '-'\n    }\n\n    var keyMap = {\n        backspace: 8,\n        tab: 9,\n\n        shift: 16,\n        ctrl: 17,\n        alt: 18,\n        meta: 91,\n\n        clear: 12,\n        enter: 13,\n        return: 13,\n        esc: 27,\n        escape: 27,\n        capslock: 20,\n        space: 32,\n        left: 37,\n        up: 38,\n        right: 39, down: 40,\n        del: 46,\n        delete: 46,\n        home: 36,\n        end: 35,\n        insert: 45,\n        ins: 45,\n        pageup: 33, pagedown: 34,\n        plus: 187,\n        minus: 189,\n\n        '-': 189,\n        ',': 188, '.': 190, '/': 191,\n        '`': 192, '=': 187,\n        ';': 186, '\\'': 222,\n        '[': 219, ']': 221, '\\\\': 220,\n\n        F1: 112,\n        F2: 113,\n        F3: 114,\n        F4: 115,\n        F5: 116,\n        F6: 117,\n        F7: 118,\n        F8: 119,\n        F9: 120,\n        F10: 121,\n        F11: 122,\n        F12: 123\n    }\n\n    /**\n     * @enum {string}\n     */\n    var Types = {\n        KEYPRESS: 'keypress',\n        KEYDOWN: 'keydown',\n        KEYUP: 'keyup'\n    }\n\n    /**\n     * @Array<Types>\n     */\n    var AvailableEventTypes = [\n        Types.KEYPRESS,\n        Types.KEYDOWN,\n        Types.KEYUP\n    ]\n\n    /**\n     * @param {number} charCode\n     * @param {boolean=} isShift\n     * @param {boolean=} isCtrl\n     * @param {boolean=} isAlt\n     * @param {boolean=} isMeta\n     * @param {Types} type\n     * @constructor\n     * @private\n     */\n    var KeyboardEvent = function(charCode, isShift, isCtrl, isAlt, isMeta, type) {\n        this.which = charCode\n        this.shiftKey = isShift || false\n        this.ctrlKey = isCtrl || false\n        this.altKey = isAlt || false\n        this.metaKey = isMeta || false\n        this.type = type || Types.KEYDOWN\n    }\n\n    /**\n     * @public\n     * @param {KeyboardEvent} e\n     * @returns {KeyboardEvent}\n     */\n    KeyboardEvent.fromNative = function(e) {\n\n        let normalizedCharCode = e.which\n\n        if (e.type === Types.KEYPRESS) {\n            normalizedCharCode = String.fromCharCode(e.which).toUpperCase().charCodeAt(0)\n        }\n\n        if (charCodeAlternatives[normalizedCharCode]) {\n            normalizedCharCode = KeyboardParser.getCode(charCodeAlternatives[normalizedCharCode])\n        }\n\n        const event = new KeyboardEvent(normalizedCharCode, e.shiftKey, e.ctrlKey, e.altKey, e.metaKey, e.type)\n\n        // to treat modifier as a regular keystroke we need to switch of the modifier activity flag for the keyup event.\n        if (e.type === Types.KEYUP && modifierMap[normalizedCharCode]) {\n            event[modifierMap[normalizedCharCode]] = false\n        }\n\n        return event\n    }\n\n    /**\n     * @public\n     * @param {KeyboardEvent} eventToCompare\n     */\n    KeyboardEvent.prototype.modifiersCompare = function(eventToCompare) {\n\n        return (this.shiftKey ? this.shiftKey === eventToCompare.shiftKey : true) &&\n            (this.ctrlKey ? this.ctrlKey === eventToCompare.ctrlKey : true) &&\n            (this.altKey ? this.altKey === eventToCompare.altKey : true) &&\n            (this.metaKey ? this.metaKey === eventToCompare.metaKey : true)\n    }\n\n    /**\n     *\n     * @param {Types} type\n     */\n    KeyboardEvent.prototype.setType = function(type) {\n        this.type = type\n        return this\n    }\n\n    joint.ui.Keyboard = Keyboard\n\n}(joint, Backbone))\n\njoint.ui.Lightbox = joint.ui.Dialog.extend({\n\n    className: `${joint.ui.Dialog.prototype.className  } lightbox`,\n\n    options: joint.util.merge({}, joint.ui.Dialog.prototype.options, {\n        closeButton: true,\n        modal: true,\n        downloadable: false, // Add a default download button to buttons.\n        downloadAction: 'download', // Action to trigger download ('action:download' by default).\n        fileName: 'Image', // Default filename of downloaded files.\n        closeAnimation: {\n            delay: 2000,\n            duration: 200,\n            easing: 'swing',\n            properties: {\n                opacity: 0\n            }\n        },\n        top: 100, // The distance from the image to the top of the screen.\n        windowArea: .8, // The maxium percentage of the window that is covered by lightbox.\n        openAnimation: false\n    }),\n\n    init: function() {\n\n        joint.util.bindAll(this, 'startCloseAnimation', 'positionAndScale')\n\n        joint.ui.Dialog.prototype.init.apply(this, arguments)\n\n        if (this.options.image) {\n            this.$image = $('<img/>').on('load', this.positionAndScale)\n            this.options.content = this.$image\n        }\n\n        if (this.options.downloadable) {\n            // default button, triggers download action as provided by user (default: 'download')\n            const defaultDownloadButton = { action: this.options.downloadAction, content: 'Download', position: 'center' }\n\n            this.buttons = Array.isArray(this.buttons) ? this.buttons.slice() : []\n            this.buttons.push(defaultDownloadButton)\n        }\n\n        // listen on self for download action\n        this.on(`action:${  this.options.downloadAction}`, this.download)\n\n        $(window).on('resize', this.positionAndScale)\n        this.on('close:animation:complete', this.remove, this)\n    },\n\n    open: function() {\n\n        joint.ui.Dialog.prototype.open.apply(this, arguments)\n\n        // Load the image content when the dialog element is already in the DOM - IE is not able\n        // to measure the element if it's not previously rendered.\n        if (this.$image) {\n            this.$image.attr('src', this.options.image )\n        }\n\n        this.positionAndScale()\n        this.startOpenAnimation()\n        return this\n    },\n\n    positionAndScale: function() {\n        // We do our best to show both the image and the titlebar text in the window\n        // without any scrolling.\n\n        const $fg = this.$('.fg')\n        const $img = this.$('.body > img')\n        const $titlebar = this.$('.titlebar')\n        const $controls = this.$('.controls')\n\n        const ratio = this.options.windowArea\n\n        const width = window.innerWidth * ratio\n\n        // Offset the whole lightbox by the `options.top` coordinate.\n        this.$el.css('margin-top', this.options.top)\n\n        // Get the height of the titlebar if it could wrap into maximum fg width.\n        // This works as an approximation as long as the window is not too small.\n        // Ideally, we would calculate titlebar height only after it is wrapped into image width.\n        // Unfortunately, that calculation needs titlebar height.\n        $titlebar.css('width', width)\n        const titlebarHeight = $titlebar.height()\n\n        // Get the height of lightbox buttons.\n        const controlsHeight = $controls.height()\n\n        // Calculate the height of the whole lightbox foreground, without titlebar and download button.\n        const height = (window.innerHeight * ratio) - this.options.top - titlebarHeight - controlsHeight\n\n        // Set maximum area for the image and let the image scale via CSS (max-width/max-height).\n        $fg.css({ width: width, height: height })\n\n        // Now set the foreground bbox according to the image size.\n        // Then, titlebar and controls can be positioned in CSS relative\n        // to the foreground.\n        const imageWidth = $img.width()\n        const imageHeight = $img.height()\n\n        $fg.css({ width: imageWidth, height: imageHeight })\n\n        // make sure controls are positioned under titlebar after it wraps into imageWidth\n        $titlebar.css('width', 'auto')\n        if (!$titlebar.hasClass('empty')) $controls.css('top', $titlebar.outerHeight())\n\n    },\n\n    download: function() {\n\n        joint.util.imageToDataUri(this.options.image, (function(err, dataUri) {\n            joint.util.downloadDataUri(dataUri, this.options.fileName)\n        }).bind(this))\n    },\n\n    close: function() {\n\n        if (this.options.closeAnimation) {\n            this.startCloseAnimation()\n        } else {\n            joint.ui.Dialog.prototype.close.apply(this, arguments)\n        }\n\n        return this\n    },\n\n    onRemove: function() {\n\n        joint.ui.Dialog.prototype.onRemove.apply(this, arguments)\n        $(window).off('resize', this.positionAndScale)\n\n        if (this.$image) {\n            this.$image.off('load', this.positionAndScale)\n        }\n    },\n\n    startCloseAnimation: function() {\n\n        this.$el.animate(this.options.closeAnimation.properties, joint.util.assign({\n\n            complete: function() {\n\n                this.trigger('close:animation:complete')\n\n            }.bind(this)\n\n        }, this.options.closeAnimation))\n    },\n\n    startOpenAnimation: function() {\n\n        this.$el.animate(joint.util.assign({}, this.options.openAnimation.properties, { height: this._foregroundHeight }), joint.util.assign({\n\n            complete: function() {\n\n                this.trigger('open:animation:complete')\n\n            }.bind(this)\n\n        }, this.options.openAnimation))\n    }\n})\n\n// A context toolbar.\n// Context toolbar contains tools (usually buttons) that should be displayed below a certain target element.\n// Only one context toolbar can be opened at a time. This simplifies the process and makes sure you don't have to\n// keep track of opened context toolbars.\n\njoint.ui.ContextToolbar = joint.mvc.View.extend({\n\n    className: 'context-toolbar',\n\n    eventNamespace: 'context-toolbar',\n\n    events: {\n        'click .tool': 'onToolPointerdown'\n    },\n\n    options: {\n        padding: 20,\n        autoClose: true\n    },\n\n    init: function() {\n\n        joint.util.bindAll(this, 'onDocumentMousedown')\n    },\n\n    render: function() {\n\n        if (this.constructor.opened) {\n            // Only one context toolbar can be opened at a time.\n\n            this.constructor.close()\n        }\n\n        this.bind()\n\n        if (this.options.type) {\n            this.$el.attr('data-type', this.options.type)\n        }\n\n        $(this.getRoot()).append(this.$el)\n\n        this.renderContent()\n\n        this.position()\n\n        this.constructor.opened = this\n\n        return this\n    },\n\n    renderContent: function() {\n\n        const $tools = $('<div/>', { class: 'tools' })\n\n        if (this.options.tools) {\n\n            joint.util.toArray(this.options.tools).forEach(function(tool) {\n\n                let $html\n                if (tool.icon) {\n                    $html = $('<img/>', { src: tool.icon })\n                } else {\n                    $html = tool.content\n                }\n\n                const $tool = $('<button/>', {\n                    class: 'tool',\n                    html: $html,\n                    'data-action': tool.action\n                })\n\n                if (tool.attrs) {\n                    $tool.attr(tool.attrs)\n                }\n\n                $tools.append($tool)\n            })\n        }\n\n        this.$el.append($tools)\n    },\n\n    getRoot: function() {\n\n        return this.options.root || document.documentElement\n    },\n\n    position: function() {\n\n        const bbox = joint.util.getElementBBox(this.options.target)\n        const rootBbox = joint.util.getElementBBox(this.getRoot())\n        const width = this.$el.outerWidth()\n\n        let left = bbox.x + bbox.width / 2 - width / 2\n        let top = bbox.y + bbox.height + this.options.padding\n\n        left -= rootBbox.x\n        top -= rootBbox.y\n\n        this.$el.css({ left: left, top: top })\n    },\n\n    onRemove: function() {\n\n        this.unbind()\n        this.constructor.opened = undefined\n    },\n\n    bind: function() {\n\n        // It is important to have the toolbar opened on `mousedown` event instead\n        // of `click`. This is because we want to handle the earliest event possible.\n        // Imagine you want to show the context toolbar when the user clicks an element.\n        // We render the toolbar. If we were to register a handler for click,\n        // the user would at some point release its mouse, this toolbar would\n        // catch the click event outside of both the target and the toolbar\n        // itself and would remove itself immediately.\n        $(document).on(`mousedown.${  this.eventNamespace}`, this.onDocumentMousedown)\n    },\n\n    unbind: function() {\n\n        $(document).off(`mousedown.${  this.eventNamespace}`, this.onDocumentMousedown)\n        return this\n    },\n\n    onToolPointerdown: function(evt) {\n\n        const $tool = $(evt.target).closest('[data-action]')\n        const action = $tool.attr('data-action')\n        if (action) {\n\n            this.trigger(`action:${  action}`, evt)\n        }\n    },\n\n    onDocumentMousedown: function(evt) {\n\n        if (this.options.autoClose) {\n            const {target} = this.options\n            if (!this.el.contains(evt.target) && !target.contains(evt.target) && target !== evt.target) {\n                // Check if the user clicked outside the context toolbar and hide it if yes.\n                this.constructor.close()\n                this.remove()\n            }\n        }\n    }\n\n}, {\n\n    opened: undefined,  // The currently opened context toolbar.\n\n    close: function() {\n\n        if (this.opened) {\n            this.opened.remove()\n            this.opened = undefined\n        }\n    },\n\n    // Call whenever the `options.target` changes its position.\n    update: function() {\n\n        if (this.opened) {\n            this.opened.position()\n        }\n    }\n\n})\n\n// ui.Popup is like ui.ContextToolbar except that it can contain any HTML.\n// This is useful for displaying a contextual widget that contains forms or other\n// HTML. Popups also have an arrow pointing up.\n\n// @import ui.ContextToolbar\n\njoint.ui.Popup = joint.ui.ContextToolbar.extend({\n\n    className: 'popup',\n\n    eventNamespace: 'popup',\n\n    events: {},\n\n    renderContent: function() {\n\n        const content = joint.util.isFunction(this.options.content) ? this.options.content(this.el) : this.options.content\n        if (content) {\n            this.$el.html(content)\n        }\n    }\n})\n\njoint.ui.SelectBox = joint.mvc.View.extend({\n\n    className: 'select-box',\n\n    events: {\n        'click .select-box-selection': 'onToggle'\n    },\n\n    options: {\n        options: [],    // Example: `{ content: '<b>foo</b><br/><small>bar</small>', value: 'foo', selected: true }`\n        width: undefined,   // Set the width of the select box in JS. If `undefined`, it is assumed the width is set in CSS.\n        openPolicy: 'auto', // Determines where the options panel will be displayed.\n        target: null,\n        keyboardNavigation: true,\n        selected: undefined,  // selected value can either be defined directly in the options array or here as an index to it.\n        selectBoxOptionsClass: undefined,\n        disabled: false\n    },\n\n    init: function() {\n\n        this.options.target = this.options.target || document.body\n\n        joint.util.bindAll(this, 'onOutsideClick', 'onOptionSelect')\n\n        $(document).on('click.selectBox', this.onOutsideClick)\n\n        this.$el.data('view', this)\n\n        if (this.options.selected === undefined) {\n\n            // If there is no selection at the beginning, we assume it is the first\n            // option in the options array. This behaviour copies the behaviour\n            // of the native `<select>` HTML element.\n            this.selection = joint.util.toArray(this.options.options).find(function(item) {\n                return item.selected === true\n            }) || this.options.options[0]\n\n        } else {\n\n            this.selection = this.options.options[this.options.selected]\n        }\n    },\n\n    render: function() {\n\n        this.$el.empty()\n        this.$selection = null\n\n        this.renderSelection(this.selection)\n\n        if (this.options.width) {\n            this.$el.css('width', this.options.width)\n        }\n\n        if (this.options.disabled) {\n            this.disable()\n        }\n\n        this.$el.append(this.$options)\n\n        return this\n    },\n\n    renderOptions: function() {\n\n        this.removeOptions()\n\n        const {options} = this\n        const config = {\n            selectBoxView: this,\n            parentClassName: joint.util.result(this, 'className') || null,\n            extraClassName: joint.util.result(options, 'selectBoxOptionsClass') || null,\n            options: options.options\n        }\n\n        if (options.width) {\n            config.width = options.width\n        }\n        if (options.theme) {\n            config.theme = options.theme\n        }\n\n        const optionsView = this.optionsView = new this.constructor.OptionsView(config)\n        optionsView.render()\n        this.listenTo(optionsView, 'option:select', this.onOptionSelect)\n        this.listenTo(optionsView, 'option:hover', this.onOptionHover)\n        this.listenTo(optionsView, 'options:mouseout', this.onOptionsMouseOut)\n        this.$options = optionsView.$el\n        this.$optionsArrow = optionsView.$arrow\n        this.$target = $(options.target)\n    },\n\n    onOptionHover: function(option, idx) {\n\n        this.trigger('option:hover', option, idx)\n    },\n\n    onOptionsMouseOut: function(evt) {\n\n        this.trigger('options:mouseout', evt)\n    },\n\n    onOptionSelect: function(idx, opt) {\n\n        this.select(idx, opt)\n    },\n\n    removeOptions: function() {\n\n        if (this.optionsView) {\n            this.stopListening(this.optionsView)\n            this.optionsView.remove()\n            this.optionsView = null\n        }\n    },\n\n    renderSelection: function(option) {\n\n        if (!this.$selection) {\n            this.$selection = $('<div/>', { class: 'select-box-selection' })\n            this.$el.append(this.$selection)\n        }\n\n        this.$selection.empty()\n\n        if (option) {\n\n            const $option = this.constructor.OptionsView.prototype.renderOptionContent.call(undefined, option)\n            this.$selection.append($option)\n\n        } else if (this.options.placeholder) {\n\n            const $placeholder = $('<div/>', { class: 'select-box-placeholder', html: this.options.placeholder })\n            this.$selection.append($placeholder)\n        }\n    },\n\n    onToggle: function(evt) {\n\n        this.toggle()\n    },\n\n    onOutsideClick: function(evt) {\n\n        // Check the clicked element is really outside our select box.\n        if (!this.el.contains(evt.target) && this.$el.hasClass('opened')) {\n            this.close()\n        }\n    },\n\n    getSelection: function() {\n\n        return this.selection\n    },\n\n    getSelectionValue: function(selection) {\n\n        selection = selection || this.selection\n\n        return selection && (selection.value === undefined ? selection.content : selection.value)\n    },\n\n    getSelectionIndex: function() {\n\n        return joint.util.toArray(this.options.options).findIndex(function(item) {\n            return item === this.selection\n        }.bind(this))\n    },\n\n    select: function(idx, opt) {\n\n        this.selection = this.options.options[idx]\n        this.renderSelection(this.selection)\n        this.trigger('option:select', this.selection, idx, opt)\n        this.close()\n    },\n\n    selectByValue: function(value, opt) {\n\n        const options = this.options.options || []\n        for (let i = 0; i < options.length; i++) {\n            const option = options[i]\n            if (option.value === undefined && option.content === value) {\n                return this.select(i, opt)\n            } else if (option.value !== undefined && joint.util.isEqual(option.value, value)) {\n                return this.select(i, opt)\n            }\n        }\n    },\n\n    isOpen: function() {\n\n        return this.$el.hasClass('opened')\n    },\n\n    toggle: function() {\n\n        if (this.isOpen()) {\n            this.close()\n        } else {\n            this.open()\n        }\n    },\n\n    position: function() {\n\n        const $selection = this.$('.select-box-selection')\n\n        const selectionHeight = $selection.outerHeight()\n        const selectionOffset = $selection.offset()\n        const selectionLeft = selectionOffset.left\n        const selectionTop = selectionOffset.top\n\n        const optionsHeight = this.$options.outerHeight()\n\n        let targetBBox = { left: 0, top: 0 }\n\n        if (this.options.target !== document.body) {\n\n            targetBBox = this.$target.offset()\n\n            targetBBox.width = this.$target.outerWidth()\n            targetBBox.height = this.$target.outerHeight()\n            targetBBox.left -= this.$target.scrollLeft()\n            targetBBox.top -= this.$target.scrollTop()\n        } else {\n\n            targetBBox.width = $(window).width()\n            targetBBox.height = $(window).height()\n        }\n\n        let left = selectionLeft\n        let top = 'auto'\n        let {openPolicy} = this.options\n\n        // For a selected open policy and no selection, we fallback to the\n        // 'auto' open policy. This is because we don't know the position of the\n        // selected option as there is no.\n        if (openPolicy === 'selected' && !this.selection) {\n            openPolicy = 'auto'\n        }\n\n        switch (openPolicy) {\n            case 'above':\n                top = selectionTop - optionsHeight\n                break\n            case 'coverAbove':\n                top = selectionTop - optionsHeight + selectionHeight\n                break\n            case 'below':\n                top = selectionTop + selectionHeight\n                break\n            case 'coverBelow': // default\n                top = selectionTop\n                break\n            case 'selected':\n                var selectedOptionPosition = this.$options.find('.selected').position()\n                top = selectionTop - selectedOptionPosition.top\n                break\n            default: // 'auto'\n                // It's like coverBelow but it tries to find the best spot. If the\n                // select box does not fit to the screen (goes below the screen edge),\n                // display it as coverAbove.\n\n                var isOptionsOverBottomEdge = (selectionTop - this.$target.scrollTop() + optionsHeight > targetBBox.top + targetBBox.height)\n                top = isOptionsOverBottomEdge ? selectionTop - optionsHeight + selectionHeight : selectionTop\n\n                break\n        }\n\n        // Position relative to target element\n        left -= targetBBox.left\n        top -= targetBBox.top\n\n        this.$options.css({ left: left, top: top })\n    },\n\n    open: function() {\n\n        if (this.isDisabled()) return\n        this.renderOptions()\n        this.$options.appendTo(this.options.target)\n        this.$options.addClass('rendered')\n        this.position()\n        this.$el.addClass('opened')\n        this.respectWindowBoundaries()\n        this.alignOptionsArrow()\n    },\n\n    respectWindowBoundaries: function() {\n\n        const overflow = this.calculateElOverflow(this.$options)\n        const increment = {\n            left: 0,\n            top: 0\n        }\n\n        if (this.$options.outerWidth() <= this.$target.innerWidth()) {\n\n            // Only adjust for left/right overflow if options element fits within target element.\n\n            if (overflow.left && overflow.right) {\n                // Do nothing if overflowing both the left and right.\n            } else if (overflow.left) {\n                increment.left = overflow.left\n            } else if (overflow.right) {\n                increment.left = -overflow.right\n            }\n        }\n\n        if (this.$options.outerHeight() <= this.$target.innerHeight()) {\n\n            // Only adjust for top/bottom overflow if options element fits within target element.\n\n            if (overflow.top && overflow.bottom) {\n                // Do nothing if overflowing both the top and bottom.\n            } else if (overflow.top) {\n                increment.top = overflow.top\n            } else if (overflow.bottom) {\n                increment.top = -overflow.bottom\n            }\n        }\n\n        this.$options.css({\n            left: `+=${  increment.left}`,\n            top: `+=${  increment.top}`\n        })\n    },\n\n    alignOptionsArrow: function() {\n\n        const elBBox = this.$el[0].getBoundingClientRect()\n        const optionsBBox = this.$options[0].getBoundingClientRect()\n        let newLeft = elBBox.left + (elBBox.width / 2)\n\n        newLeft -= optionsBBox.left\n        newLeft -= this.$optionsArrow.outerWidth() / 2\n\n        this.$optionsArrow.css({\n            left: newLeft\n        })\n    },\n\n    close: function() {\n\n        this.removeOptions()\n        this.$el.removeClass('opened')\n\n        this.trigger('close')\n    },\n\n    onRemove: function() {\n\n        this.removeOptions()\n        $(document).off('.selectBox', this.onOutsideClick)\n    },\n\n    isDisabled: function() {\n\n        return this.$el.hasClass('disabled')\n    },\n\n    enable: function() {\n\n        this.$el.removeClass('disabled')\n    },\n\n    disable: function() {\n\n        this.close()\n        this.$el.addClass('disabled')\n    },\n\n    onSetTheme: function(oldTheme, newTheme) {\n\n        if (this.$options) {\n\n            if (oldTheme) {\n                this.$options.removeClass(this.themeClassNamePrefix + oldTheme)\n            }\n\n            this.$options.addClass(this.themeClassNamePrefix + newTheme)\n        }\n    },\n\n    /*\n        Calculate the number of pixels an element is overflowing the target container.\n    */\n    calculateElOverflow: function(el, target) {\n\n        if (!target) {\n            target = window\n        }\n\n        if (el instanceof $) {\n            el = el[0]\n        }\n\n        if (target instanceof $) {\n            target = target[0]\n        }\n\n        const overflow = {}\n        const elBBox = el.getBoundingClientRect()\n        let targetBBox\n\n        if (target === window) {\n\n            // Window doesn't have getBoundingClientRect method.\n\n            const windowWidth = window.innerWidth || document.documentElement.clientWidth || document.body.clientWidth\n            const windowHeight = window.innerHeight || document.documentElement.clientHeight || document.body.clientHeight\n\n            targetBBox = {\n                width: windowWidth,\n                height: windowHeight,\n                left: 0,\n                top: 0,\n                right: windowWidth,\n                bottom: windowHeight\n            }\n\n        } else {\n            targetBBox = target.getBoundingClientRect()\n        }\n\n        ['left', 'top'].forEach(function(side) {\n            overflow[side] = Math.min(0, elBBox[side] - targetBBox[side])\n        });\n\n        ['right', 'bottom'].forEach(function(side) {\n            overflow[side] = Math.min(0, targetBBox[side] - elBBox[side])\n        })\n\n        joint.util.forIn(overflow, function(value, key) {\n            overflow[key] = Math.abs(Math.round(value))\n        })\n\n        return overflow\n    }\n\n}, {\n\n    // Statics\n\n    OptionsView: joint.mvc.View.extend({\n\n        events: {\n            'mouseover .select-box-option': 'onOptionHover',\n            'click .select-box-option': 'onOptionClick'\n        },\n\n        className: function() {\n\n            const classNames = ['select-box-options']\n            const {parentClassName} = this.options\n\n            if (parentClassName) {\n                classNames.push(parentClassName)\n            }\n\n            return classNames.join(' ')\n        },\n\n        init: function() {\n\n            joint.util.bindAll(this, 'onMouseout', 'onKeydown')\n\n            $(document).on({\n                'keydown.selectBoxOptions': this.onKeydown,\n                'mouseleave.selectBoxOptions mouseout.selectBoxOptions': this.onMouseout\n            })\n        },\n\n        render: function() {\n\n            const {extraClassName} = this.options\n            if (extraClassName) {\n                this.$el.addClass(extraClassName)\n            }\n\n            if (this.options.width) {\n                this.$el.css('width', this.options.width)\n            }\n            joint.util.toArray(this.options.options).forEach(function(option, idx) {\n\n                const $option = this.renderOption(option, idx)\n\n                if (this.options.selectBoxView.selection === option) {\n                    $option.addClass('selected hover')\n                }\n\n                this.$el.append($option)\n\n            }, this)\n\n            this.$arrow = $('<div/>').addClass('select-box-options-arrow').appendTo(this.$el)\n\n            return this\n        },\n\n        renderOption: function(option, idx) {\n\n            const $option = this.renderOptionContent(option)\n            $option.addClass('select-box-option')\n            $option.data('index', idx)\n            return $option\n        },\n\n        renderOptionContent: function(option) {\n\n            const $option = $('<div/>', { class: 'select-box-option-content', html: option.content })\n\n            if (option.icon) {\n                $option.prepend($('<img/>', {\n                    class: 'select-box-option-icon',\n                    src: option.icon\n                }))\n            }\n\n            return $option\n        },\n\n        select: function(idx, opt) {\n\n            this.trigger('option:select', idx, opt)\n        },\n\n        hover: function(idx) {\n\n            const option = this.options.options[idx]\n            this.markOptionHover(idx)\n            this.trigger('option:hover', option, idx)\n        },\n\n        onOptionClick: function(evt) {\n\n            const idx = this.getOptionIndex(evt.target)\n            this.select(idx, { ui: true })\n        },\n\n        onOptionHover: function(evt) {\n\n            const idx = this.getOptionIndex(evt.target)\n            this.hover(idx)\n        },\n\n        onMouseout: function(evt) {\n\n            this.trigger('options:mouseout', evt)\n        },\n\n        onKeydown: function(evt) {\n\n            const {selectBoxView} = this.options\n\n            if (!selectBoxView.options.keyboardNavigation) return\n            if (!selectBoxView.isOpen()) return\n\n            let dir\n\n            switch (evt.which) {\n\n                case 39:    // right\n                case 40:    // down\n                    dir = 1\n                    break\n                case 38:    // up\n                case 37:    // left\n                    dir = -1\n                    break\n                case 13:    // enter\n                    var hoverIndex = this.getOptionHoverIndex()\n                    // `hoverIndex === -1` means no option has been hovered yet.\n                    if (hoverIndex >= 0) {\n                        this.select(hoverIndex)\n                    }\n                    return\n                case 27:    // esc\n                    return selectBoxView .close()\n                default:\n                    return // noop; Unsupported key.\n            }\n\n            // Prevent page scrolling.\n            evt.preventDefault()\n\n            const idx = this.getOptionHoverIndex()\n            let nextIdx = idx + dir\n            const {options} = this.options\n\n            // Normalize and cycle if necessary.\n            if (nextIdx < 0) { nextIdx = options.length - 1 }\n            if (nextIdx >= options.length) { nextIdx = 0 }\n\n            this.hover(nextIdx)\n        },\n\n        onRemove: function() {\n\n            $(document).off('.selectBoxOptions')\n        },\n\n        markOptionHover: function(idx) {\n\n            this.$el.find('.hover').removeClass('hover')\n            $(this.$el.find('.select-box-option')[idx]).addClass('hover')\n        },\n\n        getOptionHoverIndex: function() {\n\n            return this.$el.find('.select-box-option.hover').index()\n        },\n\n        getOptionIndex: function(el) {\n\n            return $(el).closest('.select-box-option').data('index')\n        }\n    })\n})\n\njoint.ui.ColorPalette = joint.ui.SelectBox.extend({\n\n    className: 'select-box color-palette',\n\n    position: function() {\n\n        const $selection = this.$('.select-box-selection')\n        const selectionHeight = $selection.outerHeight()\n        const selectionOffset = $selection.offset()\n\n        let {left} = selectionOffset\n        let top = selectionOffset.top + selectionHeight\n\n        if (this.options.target !== document.body) {\n\n            this.$target = this.$target || $(this.options.target)\n\n            // Position relative to target element\n            const targetOffset = this.$target.offset()\n            left -= targetOffset.left - this.$target.scrollLeft()\n            top -= targetOffset.top - this.$target.scrollTop()\n        }\n\n        this.$options.css({ left: left, top: top })\n    }\n\n}, {\n\n    // Statics\n\n    OptionsView: joint.ui.SelectBox.OptionsView.extend({\n\n        renderOptionContent: function(option) {\n\n            const $option = $('<div/>', { class: 'select-box-option-content' })\n\n            $option.css('background-color', option.content)\n\n            if (option.icon) {\n                $option.prepend($('<img/>', {\n                    class: 'select-box-option-icon',\n                    src: option.icon\n                }))\n            }\n\n            return $option\n        }\n    })\n\n})\n\njoint.ui.SelectButtonGroup = joint.mvc.View.extend({\n\n    className: 'select-button-group',\n\n    events: {\n        'click .select-button-group-button': 'onSelect',\n        'mouseover .select-button-group-button': 'onOptionHover',\n        mouseleave: 'onMouseOut',\n        'mousedown .select-button-group-button': 'pointerdown',\n        'touchstart .select-button-group-button': 'pointerdown',\n        'mouseup .select-button-group-button': 'pointerup',\n        'touchend .select-button-group-button': 'pointerup'\n    },\n\n    options: {\n        buttonWidth: undefined,\n        buttonHeight: undefined,\n        options: [],\n        disabled: false,\n        multi: false,   // Are multiple selections allowed?\n        selected: undefined  // selected value can either be defined directly in the options array or here as an index to it.\n    },\n\n    init: function() {\n\n        joint.util.bindAll(this, 'onSelect', 'pointerup')\n\n        this.$el.data('view', this)\n\n        const {multi} = this.options\n\n        const optionsItems = this.options.options\n        const {selected} = this.options\n        if (selected === undefined) {\n\n            const selectedOptions = joint.util.toArray(optionsItems).filter(function(item) {\n                return item && item.selected === true\n            })\n            this.selection = (multi) ? selectedOptions : selectedOptions[0]\n\n        } else if (multi) {\n\n                this.selection = Array.isArray(selected) ? optionsItems.filter(function(option, idx) {\n                    return selected.includes(idx)\n                }) : [optionsItems[selected]]\n\n            } else {\n\n                this.selection = optionsItems[selected]\n            }\n    },\n\n    render: function() {\n\n        this.renderOptions(this.selection)\n\n        if (this.options.width) {\n            this.$el.css('width', this.options.width)\n        }\n\n        if (this.options.disabled) {\n            this.disable()\n        }\n\n        this.$el.append(this.$options)\n\n        return this\n    },\n\n    renderOptions: function() {\n\n        this.removeOptions()\n\n        const {multi} = this.options\n\n        joint.util.toArray(this.options.options).forEach(function(option, idx) {\n\n            const isSelected = (multi ? this.selection.includes(option) : this.selection === option)\n\n            const $option = this.renderOption(option, idx, isSelected)\n            this.$el.append($option)\n\n            if (isSelected) {\n\n                $option.addClass('selected')\n            }\n        }, this)\n    },\n\n    removeOptions: function() {\n\n        this.$el.empty()\n    },\n\n    renderOption: function(option, idx, isSelected) {\n\n        const $option = this.renderOptionContent(option, isSelected)\n        $option.data('index', idx)\n        const buttonWidth = option.buttonWidth || this.options.buttonWidth\n        if (buttonWidth) {\n            $option.css('width', buttonWidth)\n        }\n        const buttonHeight = option.buttonHeight || this.options.buttonHeight\n        if (buttonHeight) {\n            $option.css('height', buttonHeight)\n        }\n        return $option\n    },\n\n    renderOptionContent: function(option, isSelected) {\n\n        const $option = $('<div/>', { class: 'select-button-group-button', html: option.content })\n        if (option.icon || (isSelected && option.iconSelected)) {\n            const $icon = $('<img/>', {\n                class: 'select-button-group-button-icon',\n                src: isSelected && option.iconSelected ? option.iconSelected : option.icon\n            })\n            const iconWidth = option.iconWidth || this.options.iconWidth\n            if (iconWidth) {\n                $icon.css('width', iconWidth)\n            }\n            const iconHeight = option.iconHeight || this.options.iconHeight\n            if (iconHeight) {\n                $icon.css('height', iconHeight)\n            }\n            $option.prepend($icon)\n        }\n        // `option.attrs` allows for setting arbitrary attributes on the generated HTML.\n        // This object is of the form: `<selector> : { <attributeName> : <attributeValue>, ... }`\n        joint.util.setAttributesBySelector($option, option.attrs)\n\n        return $option\n    },\n\n    getOptionIndex: function(el) {\n\n        return $(el).closest('.select-button-group-button').data('index')\n    },\n\n    onSelect: function(evt) {\n\n        if (this.isDisabled()) return\n        const idx = this.getOptionIndex(evt.target)\n        this.select(idx, { ui: true })\n    },\n\n    onOptionHover: function(evt) {\n\n        if (this.isDisabled()) return\n        const idx = this.getOptionIndex(evt.target)\n        this.trigger('option:hover', this.options.options[idx], idx)\n    },\n\n    onMouseOut: function(evt) {\n\n        if (this.isDisabled()) return\n        this.trigger('mouseout', evt)\n    },\n\n    getSelection: function() {\n\n        return this.selection\n    },\n\n    getSelectionValue: function(selection) {\n\n        selection = selection || this.selection\n\n        if (!selection) return undefined\n\n        if (this.options.multi) {\n            return joint.util.toArray(selection).map(function(option) {\n                return option.value === undefined ? option.content : option.value\n            })\n        }\n        return selection.value === undefined ? selection.content : selection.value\n    },\n\n    select: function(index, opt) {\n\n        const option = this.options.options[index]\n        const $option = $(this.$('.select-button-group-button')[index])\n        const {multi} = this.options\n\n        if (multi) {\n\n            $option.toggleClass('selected')\n            const isSelected = $option.hasClass('selected')\n\n            if (isSelected) {\n\n                if (this.selection.indexOf(option) === -1) {\n                    this.selection.push(option)\n                }\n\n            } else {\n\n                this.selection = joint.util.without(this.selection, option)\n            }\n\n            if (option.iconSelected) {\n\n                $option.find('.select-button-group-button-icon').attr('src', isSelected ? option.iconSelected : option.icon)\n            }\n\n        } else {\n\n            this.selection = option\n            const $prevSelected = this.$('.selected')\n            const prevSelection = this.options.options[$prevSelected.index()]\n            $prevSelected.removeClass('selected')\n            $option.addClass('selected')\n\n            if (prevSelection && prevSelection.iconSelected) {\n                $prevSelected.find('.select-button-group-button-icon').attr('src', prevSelection.icon)\n            }\n            if (this.selection.iconSelected) {\n                $option.find('.select-button-group-button-icon').attr('src', this.selection.iconSelected)\n            }\n        }\n\n        this.trigger('option:select', this.selection, index, opt)\n    },\n\n    selectByValue: function(value, opt) {\n\n        if (!Array.isArray(value)) {\n            value = [value]\n        }\n\n        const options = this.options.options || []\n        for (let i = 0; i < options.length; i++) {\n            var option = options[i]\n            if (option.value === undefined && value.includes(option.content)) {\n                this.select(i, opt)\n            } else if (option.value !== undefined) {\n                const containsOption = value.find(function(val) {\n                    return joint.util.isEqual(val, option.value)\n                })\n                if (containsOption) {\n                    this.select(i, opt)\n                }\n            }\n        }\n    },\n\n    deselect: function() {\n\n        this.$('.selected').removeClass('selected')\n        if (this.options.multi) {\n            this.selection = []\n        } else {\n            this.selection = undefined\n        }\n    },\n\n    isDisabled: function() {\n\n        return this.$el.hasClass('disabled')\n    },\n\n    enable: function() {\n\n        this.$el.removeClass('disabled')\n    },\n\n    disable: function() {\n\n        this.$el.addClass('disabled')\n    },\n\n    pointerdown: function(evt) {\n\n        const index = this.getOptionIndex(evt.target)\n        const $option = $(this.$('.select-button-group-button')[index])\n        $option.addClass('is-in-action')\n        $(document).on('mouseup.select-button-group touchend.select-button-group', this.pointerup)\n    },\n\n    pointerup: function() {\n\n        this.$('.is-in-action').removeClass('is-in-action')\n        $(document).off('mouseup.select-button-group touchend.select-button-group')\n    }\n})\n\n// Navigator\n// =========\n\n// 'Navigator' creates a new paper (usually smaller) that helps select what part\n// of the diagram is shown (especially for a larger diagram) and provides\n// a different way how to zoom.\n\n// Example usage:\n//\n// var nav = new joint.ui.Navigator({\n//     paperScroller: paperScroller,\n//     width: 200,\n//     height: 200,\n// });\n//\n// nav.$el.appendTo('#navigator');\n// nav.render();\njoint.ui.Navigator = joint.mvc.View.extend({\n\n    className: 'navigator',\n\n    events: {\n        mousedown: 'startAction',\n        touchstart: 'startAction'\n    },\n\n    options: {\n        paperConstructor: joint.dia.Paper,\n        paperOptions: {},\n        /**\n         * @deprecated use zoom instead\n         */\n        zoomOptions: null,\n        zoom: { min: 0.5, max: 2 },\n        width: 300,\n        height: 200,\n        padding: 10\n    },\n\n    init: function() {\n\n        if (this.options.zoomOptions) {\n            // backward compatibility\n            this.options.zoom = joint.util.assign({}, this.options.zoom, this.options.zoomOptions)\n        } else if (this.options.zoom) {\n            this.options.zoom = joint.util.defaults({}, this.options.zoom, this.constructor.prototype.options.zoom)\n        }\n\n        joint.util.bindAll(this, 'updateCurrentView', 'doAction', 'stopAction', 'scrollTo')\n\n        // The updateCurrentView is called everytime paperScroller's scrollbars change\n        // or the paper is resized. Resize of the paper is normally also acompanied\n        // by a scrollbar change (but doesn't have to be). An event is triggered for\n        // the vertical and horizontal scrollbar change. That leads to the updateCurrentView\n        // to be called upto 4 times per one paperScroller action. Debouncing the method solves\n        // this issue but there is definitely room for improvement.\n        // + it solves an issue with wrong target paper position while zooming out a paper with\n        // negative x-origin\n        this.updateCurrentView = joint.util.debounce(this.updateCurrentView, 0)\n\n        const {paperScroller} = this.options\n        paperScroller.$el.on('scroll.navigator', this.updateCurrentView)\n\n        const sourcePaper = this.sourcePaper = paperScroller.options.paper\n        this.listenTo(sourcePaper, 'resize', this.updatePaper)\n\n        const targetPaper = this.targetPaper = new this.options.paperConstructor(joint.util.merge({\n            model: sourcePaper.model,\n            interactive: false\n        }, this.options.paperOptions))\n\n        targetPaper.$el.on({\n            'mousedown.navigator': this.scrollTo,\n            'touchstart.navigator': this.scrollTo\n        })\n\n        $(document.body).on({\n            'mousemove.navigator touchmove.navigator': this.doAction,\n            'mouseup.navigator touchend.navigator': this.stopAction\n        })\n    },\n\n    render: function() {\n\n        this.targetPaper.$el.appendTo(this.el)\n\n        // Adding cell views requires the paper element to be appended to the DOM.\n        // Make sure the elements are rendered before links.\n        const sourceGraph = this.sourcePaper.model\n        const sourceCells = sourceGraph.getElements().concat(sourceGraph.getLinks())\n\n        sourceCells.forEach(this.targetPaper.renderView, this.targetPaper)\n\n        this.$currentView = $('<div>').addClass('current-view')\n\n        if (this.options.zoom) {\n            const $currentViewControl = $('<div>').addClass('current-view-control')\n            this.$currentView.append($currentViewControl)\n        }\n\n        this.$el.append(this.$currentView).css({\n            width: this.options.width,\n            height: this.options.height,\n            padding: this.options.padding\n        })\n\n        // setting right target paper dimension for the first time.\n        this.updatePaper(this.sourcePaper.options.width, this.sourcePaper.options.height)\n\n        return this\n    },\n\n    // Updates the navigator's paper size and transformations\n    updatePaper: function(width, height) {\n\n        const sourceOrigin = this.sourcePaper.options.origin\n        const sourceScale = this.sourcePaper.scale()\n        const navigatorWidth = this.options.width - 2 * this.options.padding\n        const navigatorHeight = this.options.height - 2 * this.options.padding\n\n        width /= sourceScale.sx\n        height /= sourceScale.sy\n\n        const ratio = this.ratio = Math.min(navigatorWidth / width, navigatorHeight / height)\n        const ox = sourceOrigin.x * ratio / sourceScale.sx\n        const oy = sourceOrigin.y * ratio / sourceScale.sy\n\n        width *= ratio\n        height *= ratio\n\n        this.targetPaper.setDimensions(width, height)\n        this.targetPaper.setOrigin(ox, oy)\n        this.targetPaper.scale(ratio, ratio)\n\n        this.updateCurrentView()\n    },\n\n    // Updates the position and size of the navigator's current view rectangle.\n    updateCurrentView: function() {\n\n        const {ratio} = this\n        const sourceScale = this.sourcePaper.scale()\n        const {paperScroller} = this.options\n        const topLeftCoordinates = paperScroller.clientToLocalPoint(0, 0)\n        const paperPosition = this.targetPaper.$el.position()\n        const paperOrigin = this.targetPaper.translate()\n\n        // IE returns translate.ty = NaN when ty = 0. It sets transform attribute to 'translate(tx)'.\n        // TODO: handle this in the vectorizer\n        paperOrigin.ty = paperOrigin.ty || 0\n\n        this.currentViewGeometry = {\n            top: paperPosition.top + topLeftCoordinates.y * ratio + paperOrigin.ty,\n            left: paperPosition.left + topLeftCoordinates.x * ratio + paperOrigin.tx,\n            width: paperScroller.$el.innerWidth() * ratio / sourceScale.sx,\n            height: paperScroller.$el.innerHeight() * ratio / sourceScale.sy\n        }\n\n        this.$currentView.css(this.currentViewGeometry)\n    },\n\n    startAction: function(evt) {\n\n        evt = joint.util.normalizeEvent(evt)\n\n        // click on current-view control starts zooming\n        // otherwise paper panning is initated.\n        this._action = $(evt.target).hasClass('current-view-control')\n            ? 'zooming'\n            : 'panning'\n\n        this._clientX = evt.clientX\n        this._clientY = evt.clientY\n    },\n\n    doAction: function(evt) {\n\n        if (!this._action) return\n\n        evt = joint.util.normalizeEvent(evt)\n\n        const sourceScale = this.sourcePaper.scale()\n        const dx = (evt.clientX - this._clientX) * sourceScale.sx\n        const dy = (evt.clientY - this._clientY) * sourceScale.sy\n\n        switch (this._action) {\n\n            case 'panning':\n                this.options.paperScroller.el.scrollLeft += dx / this.ratio\n                this.options.paperScroller.el.scrollTop += dy / this.ratio\n                break\n\n            case 'zooming':\n\n                // dx/width is the ratio of the original width and the requested width\n                var levelDiff =  - dx / this.currentViewGeometry.width\n                this.options.paperScroller.zoom(levelDiff, this.options.zoom)\n                break\n        }\n\n        this._clientX = evt.clientX\n        this._clientY = evt.clientY\n    },\n\n    stopAction: function() {\n\n        this._action = null\n    },\n\n    // Scrolls the view to the position determined by the event.\n    scrollTo: function(evt) {\n\n        evt = joint.util.normalizeEvent(evt)\n\n        const paperOrigin = this.targetPaper.translate()\n        // TODO: see updateCurrentView method\n        paperOrigin.ty = paperOrigin.ty || 0\n\n        let offsetX; let offsetY\n        // There is no offsetX/offsetY property in the Firefox event\n        if (evt.offsetX === undefined) {\n            const targetPaperOffset = this.targetPaper.$el.offset()\n            offsetX = evt.pageX - targetPaperOffset.left\n            offsetY = evt.pageY - targetPaperOffset.top\n        } else {\n            offsetX = evt.offsetX\n            offsetY = evt.offsetY\n        }\n\n        const cx = (offsetX - paperOrigin.tx) / this.ratio\n        const cy = (offsetY - paperOrigin.ty) / this.ratio\n\n        this.options.paperScroller.center(cx, cy)\n    },\n\n    onRemove: function() {\n\n        this.targetPaper.$el.off('.navigator')\n        this.targetPaper.remove()\n        this.options.paperScroller.$el.off('.navigator')\n        $(document.body).off('.navigator')\n    }\n\n})\n\n// Tree Graph Layout View.\n// =======================\n\n// An user interface for the tree layout manipulation.\n\njoint.ui.TreeLayoutView = joint.mvc.View.extend({\n\n    MINIMAL_PREVIEW_SIZE: 10,\n    className: 'tree-layout',\n\n    options: {\n\n        // SVG attributes for the child and parent preview SVG elements.\n        previewAttrs: {\n            parent: { rx: 2, ry: 2 }\n        },\n\n        // Compute the bounding boxes for elements either from the DOM or based\n        // on the model size.\n        useModelGeometry: false,\n\n        // clone method used when an element preview is created.\n        clone: function(cell) {\n            return cell.clone()\n        },\n\n        // Specify what elements can be interacted with.\n        // e.g function(element) { return !element.get('disabled'); }\n        canInteract: function() {\n            return true\n        }\n    },\n\n    init: function() {\n\n        joint.util.bindAll(this, 'onPointermove', 'onPointerup')\n\n        this.toggleDefaultInteraction(false)\n        this.startListening()\n        this.render()\n        this.onSetTheme(null, this.theme)\n    },\n\n    // @public\n    startListening: function() {\n\n        const {paper} = this.options\n\n        this.listenTo(paper, 'element:pointerdown', this.canInteract(this.onPointerdown))\n    },\n\n    // @public\n    // Enable/Disable the default paper interactions.\n    toggleDefaultInteraction: function(interactive) {\n\n        this.options.paper.setInteractivity(interactive)\n    },\n\n    render: function() {\n\n        const {paper} = this.options\n\n        this.$activeBox = $('<div>')\n            .addClass('tree-layout-box active hidden')\n            .appendTo(this.el)\n\n        this.draggingPaper = new joint.dia.Paper({\n            model: new joint.dia.Graph,\n            interactive: false,\n            width: '100%',\n            height: '100%'\n        })\n\n        this.$translateBox = $('<div>')\n            .addClass('tree-layout-box translate hidden')\n            .append(this.draggingPaper.render().el)\n            .appendTo(this.el)\n\n        this.$mask = $('<div>').addClass('tree-layout-mask')\n\n        this.svgViewport = V(paper.viewport)\n        this.svgPreviewChild = V('circle')\n            .attr(this.options.previewAttrs.child || {})\n            .addClass('tree-layout-preview child')\n        this.svgPreviewConnection = V('path')\n            .attr(this.options.previewAttrs.link || {})\n            .addClass('tree-layout-preview link')\n        this.svgPreviewParent = V('rect')\n            .attr(this.options.previewAttrs.parent || {})\n            .addClass('tree-layout-preview parent')\n        this.svgPreview = V('g').addClass('tree-layout-preview-group').append([\n            this.svgPreviewConnection,\n            this.svgPreviewParent,\n            this.svgPreviewChild\n        ])\n\n        this.$el.appendTo(paper.el)\n\n        return this\n    },\n\n    onSetTheme: function(oldTheme, newTheme) {\n\n        const $elsWithThemeClass = [\n            this.svgPreview,\n            this.$mask\n        ]\n\n        $elsWithThemeClass.forEach(function($elWithThemeClass) {\n\n            if ($elWithThemeClass) {\n\n                if (oldTheme) {\n                    $elWithThemeClass.removeClass(this.themeClassNamePrefix + oldTheme)\n                }\n\n                $elWithThemeClass.addClass(this.themeClassNamePrefix + newTheme)\n            }\n        }, this)\n    },\n\n    onRemove: function() {\n\n        this.svgPreview.remove()\n    },\n\n    toggleDropping: function(state) {\n\n        // allows setting various cursor on the paper\n        this.$mask.toggleClass('dropping-not-allowed', !state)\n        // allows coloring of the translate box based on the state\n        this.$translateBox.toggleClass('no-drop', !state)\n    },\n\n    canDrop: function() {\n\n        return this.isActive() && !this.$translateBox.hasClass('no-drop')\n    },\n\n    isActive: function() {\n\n        return !this.$translateBox.hasClass('hidden')\n    },\n\n    _startDrag: function(elements, x, y) {\n\n        const {paper} = this.options\n\n        this.$mask.appendTo(paper.el)\n        this.toggleDropping(false)\n\n        this.ctm = paper.matrix()\n\n        const element = elements[0]\n        const elementView = element.findView(paper)\n        const bbox = elementView.getBBox({ useModelGeometry: this.options.useModelGeometry })\n\n        // showing box around active element\n        this.updateBox(this.$translateBox, joint.util.defaults({ x: x, y: y }, bbox))\n        this.updateBox(this.$activeBox, bbox)\n\n        this.$activeBox.removeClass('hidden')\n        this.$translateBox.removeClass('hidden')\n\n        this.prepareDraggingPaper(element)\n    },\n\n    updateBox: function($box, bbox) {\n\n        $box.css({\n            width: bbox.width,\n            height: bbox.height,\n            left: bbox.x,\n            top: bbox.y\n        })\n    },\n\n    positionTranslateBox: function(position) {\n\n        const transformedPosition = V.transformPoint(position, this.ctm)\n\n        this.$translateBox.css({\n            left: transformedPosition.x,\n            top: transformedPosition.y\n        })\n    },\n\n    prepareDraggingPaper: function(draggedElement) {\n\n        const clone = this.options.clone(draggedElement).position(0, 0)\n\n        // Zoom the dragging paper the same way as the main paper.\n        this.draggingPaper.scale(this.ctm.a, this.ctm.d)\n        this.draggingPaper.model.resetCells([clone])\n    },\n\n    _doDrag: function(elements, x, y) {\n\n        const layout = this.model\n        const coordinates = { x: x, y: y }\n        let rootLayoutArea\n        let layoutArea\n\n        if (this.candidate) {\n            this.candidate = null\n            this.hidePreview()\n        }\n\n        this.positionTranslateBox(coordinates)\n\n        rootLayoutArea = layout.getMinimalRootAreaByPoint(coordinates)\n        if (rootLayoutArea) {\n            layoutArea = rootLayoutArea.findMinimalAreaByPoint(coordinates, {\n                expandBy: Math.min(layout.get('siblingGap'), layout.get('gap')) / 2\n            })\n        }\n\n        if (layoutArea) {\n\n            const direction = this.findDirection(layoutArea, coordinates)\n            const siblings = layoutArea.getLayoutSiblings(direction)\n            const siblingRank = siblings.getSiblingRankByPoint(coordinates)\n\n            const isConnectionValid = joint.util.toArray(elements).every(function(item) {\n                return this.isConnectionValid(item, siblings, siblingRank)\n            }, this)\n            if (isConnectionValid) {\n\n                this.candidate = {\n                    id: layoutArea.root.id,\n                    direction: direction,\n                    siblingRank: siblingRank + 0.5\n                }\n\n                this.updatePreview(siblings, siblingRank)\n                this.showPreview()\n\n                this.toggleDropping(true)\n\n            } else {\n                this.toggleDropping(false)\n            }\n\n        } else {\n\n            this.toggleDropping(true)\n        }\n    },\n\n    _finishDrag: function(elements, x, y) {\n\n        this.$mask.remove().removeClass('dropping-not-allowed')\n\n        if (this.candidate) {\n\n            elements.forEach(function(item) {\n                this.reconnectElement(item, this.candidate)\n            }, this)\n            this.candidate = null\n            this.model.layout({ ui: true })\n\n        } else if (this.canDrop()) {\n\n            elements.forEach(function(item) {\n                this.translateElement(item, x, y)\n            }, this)\n\n            this.model.layout({ ui: true })\n        }\n\n        this.$activeBox.addClass('hidden')\n        this.$translateBox.addClass('hidden')\n\n        this.hidePreview()\n    },\n\n    reconnectElement: function(element, candidate) {\n\n        const opt = {\n            direction: candidate.direction,\n            siblingRank: candidate.siblingRank,\n            ui: true\n        }\n\n        const canReconnect = this.model.reconnectElement(element, candidate.id, opt)\n        if (!canReconnect) {\n\n            const {paper} = this.options\n            const link = paper.getDefaultLink(element.findView(paper))\n\n            link.set({ source: { id: candidate.id }, target: { id: element.id }})\n            link.addTo(paper.model, opt)\n\n            this.model.changeSiblingRank(element, candidate.siblingRank, opt)\n            this.model.changeDirection(element, candidate.direction, opt)\n\n            const prevDirection = this.model.getAttribute(element, 'direction')\n\n            this.model.updateDirections(element, [prevDirection, candidate.direction], opt)\n        }\n    },\n\n    translateElement: function(element, x, y) {\n\n        const inboundLinks = this.model.graph.getConnectedLinks(element, { inbound: true })\n\n        joint.util.invoke(inboundLinks, 'remove')\n\n        const elementSize = element.get('size')\n\n        element.set('position', {\n            x: x - elementSize.width / 2,\n            y: y - elementSize.height / 2\n        }, { ui: true })\n    },\n\n    updatePreview: function(siblings, siblingRank) {\n\n        const parent = siblings.parentArea.root\n        const childWidth = Math.max(this.model.get('siblingGap') / 2, this.MINIMAL_PREVIEW_SIZE)\n        const childSize = { width: childWidth, height: childWidth }\n        const childPosition = siblings.getNeighborPointFromRank(siblingRank)\n        const points = siblings.getConnectionPoints(childPosition, { ignoreSiblings: true })\n        const parentPoint = siblings.getParentConnectionPoint()\n        const childPoint = siblings.getChildConnectionPoint(childPosition, childSize)\n\n        this.updateParentPreview(parent.get('position'), parent.get('size'))\n        this.updateChildPreview(childPosition, childSize)\n        this.updateConnectionPreview(parentPoint, childPoint, points)\n    },\n\n    showPreview: function() {\n\n        this.svgViewport.append(this.svgPreview)\n    },\n\n    hidePreview: function() {\n\n        this.svgPreview.remove()\n    },\n\n    updateParentPreview: function(position, size) {\n\n        this.svgPreviewParent.attr({\n            x: position.x,\n            y: position.y,\n            width: size.width,\n            height: size.height\n        })\n    },\n\n    updateChildPreview: function(position, size) {\n\n        this.svgPreviewChild.attr({\n            cx: position.x,\n            cy: position.y,\n            r:  size.width / 2\n        })\n    },\n\n    updateConnectionPreview: function(source, target, vertices) {\n\n        this.svgPreviewConnection.attr({\n            d: joint.connectors.rounded(source, target, vertices, {})\n        })\n    },\n\n    findDirection: function(layoutArea, point) {\n\n        let directions\n        const type = layoutArea.root.get('layout') || layoutArea.getType()\n        switch (type) {\n            case 'BL-BR':\n            case 'TL-TR':\n            case 'L-R':\n                directions = type.split('-')\n                return (point.x > layoutArea.rootCX) ? directions[1] : directions[0]\n            case 'BL-TL':\n            case 'BR-TR':\n            case 'B-T':\n                directions = type.split('-')\n                return (point.y > layoutArea.rootCY) ? directions[0] : directions[1]\n            case 'L':\n            case 'R':\n            case 'T':\n            case 'B':\n            case 'TR':\n            case 'TL':\n            case 'BR':\n            case 'BL':\n                return type\n            default:\n                return layoutArea.direction\n        }\n    },\n\n    // @private\n    isConnectionValid: function(element, siblings, siblingRank) {\n\n        // Banning a loop connection\n        if (element.id == siblings.parentArea.root.id) return false\n\n        // If the element is ancestor of parent, there would be a loop after connection.\n        if (this.model.graph.isSuccessor(element, siblings.parentArea.root)) return false\n\n        // If we have same parent, same rank direction an we changing only the siblingRank\n        // we allow only changes that actually changes the order of siblings.\n        const elementArea = this.model.getLayoutArea(element)\n        if (elementArea.parentArea && elementArea.parentArea == siblings.parentArea && elementArea.direction == siblings.direction) {\n            const rankChange = elementArea.siblingRank - siblingRank\n            if (rankChange === 0 || rankChange === 1) return false\n        }\n\n        return true\n    },\n\n    // Interaction\n    canInteract: function(handler) {\n\n        return function(cellView) {\n            if (this.options.canInteract(cellView)) {\n                handler.apply(this, arguments)\n            }\n        }.bind(this)\n    },\n\n    startDragging: function(elements) {\n\n        const draggedElements = Array.isArray(elements) ? elements : [elements]\n        if (!joint.util.isEmpty(draggedElements)) {\n            this._registerPointerEvents()\n            this._moveCounter = 0\n            this._draggedElements = draggedElements\n        }\n    },\n\n    onPointerdown: function(elementView) {\n\n        this.startDragging(elementView.model)\n    },\n\n    onPointermove: function(evt) {\n\n        const {paper} = this.options\n        const localPoint = paper.clientToLocalPoint({ x: evt.clientX, y: evt.clientY })\n\n        if (this._moveCounter === paper.options.clickThreshold) {\n\n            this._startDrag(this._draggedElements, localPoint.x, localPoint.y)\n\n        } else if (this._moveCounter > paper.options.clickThreshold) {\n\n            this._doDrag(this._draggedElements, localPoint.x, localPoint.y)\n        }\n\n        this._moveCounter++\n    },\n\n    onPointerup: function(evt) {\n\n        const {paper} = this.options\n\n        if (this._moveCounter >= paper.options.clickThreshold) {\n\n            const localPoint = paper.clientToLocalPoint({ x: evt.clientX, y: evt.clientY })\n\n            this._finishDrag(this._draggedElements, localPoint.x, localPoint.y)\n        }\n\n        this._draggedElements = null\n        this._unregisterPointerEvents()\n    },\n\n    _registerPointerEvents: function() {\n\n        const namespace = this.getEventNamespace()\n\n        $(document)\n            .on(`mousemove${  namespace  } touchmove${  namespace}`, this.onPointermove)\n            .on(`mouseup${  namespace  } touchend${  namespace}`, this.onPointerup)\n    },\n\n    _unregisterPointerEvents: function() {\n\n        $(document).off(this.getEventNamespace())\n    }\n\n})\n\njoint.ui.PathDrawer = joint.mvc.View.extend({\n\n    tagName: 'g',\n\n    svgElement: true,\n\n    className: 'path-drawer',\n\n    events: {\n        'mousedown .start-point': 'onStartPointPointerDown',\n        mousedown: 'onPointerDown',\n        //'mousemove': 'onPointerMove',\n        //'mouseup': 'onPointerUp',\n        'touchstart .start-point': 'onStartPointPointerDown',\n        touchstart: 'onPointerDown',\n        //'touchmove': 'onPointerMove',\n        //'touchend': 'onPointerUp',\n        dblclick: 'onDoubleClick',\n        contextmenu: 'onContextMenu'\n    },\n\n    documentEvents: {\n        mousemove: 'onPointerMove',\n        touchmove: 'onPointerMove',\n        mouseup: 'onPointerUp',\n        touchend: 'onPointerUp',\n        touchcancel: 'onPointerUp',\n    },\n\n    options: {\n        pathAttributes: {\n            class: null,\n            fill: '#ffffff',\n            stroke: '#000000',\n            'stroke-width': 1,\n            'pointer-events': 'none'\n        },\n        startPointMarkup: '<circle r=\"5\"/>'\n    },\n\n    init: function() {\n\n        const svgTarget = this.svgTarget = V(this.options.target)\n\n        this.$document = $(svgTarget.node.ownerDocument)\n\n        this.action = 'awaiting-input'\n\n        this.render()\n    },\n\n    onRemove: function() {\n\n        const {pathNode} = this\n\n        if (pathNode) {\n            V(pathNode).remove()\n        }\n\n        this.clear()\n    },\n\n    clear: function() {\n\n        const {pathNode} = this\n\n        if (pathNode && pathNode.pathSegList.numberOfItems <= 1) {\n            V(pathNode).remove()\n        }\n\n        this.svgStart.remove()\n        this.svgControl.remove()\n\n        this.pathNode = null\n\n        this.undelegateDocumentEvents()\n        this.action = 'awaiting-input'\n\n        this.trigger('clear')\n    },\n\n    render: function() {\n\n        const {options} = this\n\n        this.svgPathTemplate = V('path').attr(options.pathAttributes)\n\n        this.svgStart = V(options.startPointMarkup).addClass('start-point')\n        this.svgControl = V('path').addClass('control-path')\n\n        this.vel.append(V('rect', { x: 0, y: 0, width: '100%', height: '100%', fill: 'transparent', stroke: 'none' }))\n\n        this.svgTarget.append(this.el)\n\n        return this\n    },\n\n    createPath: function(x, y) {\n\n        const path = this.svgPathTemplate.clone()\n        const pathNode = this.pathNode = path.node\n        const start = this.svgStart.translate(x, y, { absolute: true })\n\n        this.trigger('path:create', pathNode)\n\n        this.addMoveSegment(x, y)\n\n        this.vel.before(path)\n        this.vel.append(start)\n    },\n\n    closePath: function() {\n\n        const el = this.pathNode\n\n        const first = el.pathSegList.getItem(0)\n        const last = el.pathSegList.getItem(el.pathSegList.numberOfItems - 1)\n\n        if (last.pathSegType == SVGPathSeg.PATHSEG_LINETO_ABS) {\n\n            // if last segment is lineto\n            // replace with closepath\n            el.pathSegList.replaceItem(el.createSVGPathSegClosePath(), el.pathSegList.numberOfItems - 1)\n\n        } else {\n\n            // if last segment is curveto\n            // make sure that last segment ends exactly at beginning of path\n            last.x = first.x\n            last.y = first.y\n\n            // add closepath behind it\n            el.pathSegList.appendItem(el.createSVGPathSegClosePath())\n\n        }\n\n        this.finishPath('path:close')\n    },\n\n    finishPath: function(pathFinishedEventType) {\n\n        const el = this.pathNode\n\n        if (el && this.numberOfVisibleSegments() > 0) {\n\n            // the new path is not just a single point; users can see it\n            this.trigger('path:finish', el)\n            this.trigger(pathFinishedEventType, el)\n\n        } else {\n\n            // the path is just a single point; users cannot see it\n            // different event is triggered\n            this.trigger('path:abort', el)\n\n        }\n\n        this.clear()\n    },\n\n    numberOfVisibleSegments: function() {\n\n        const el = this.pathNode\n\n        let numberOfVisibleSegments = el.pathSegList.numberOfItems\n\n        numberOfVisibleSegments -= 1 // the initial moveto segment\n        if (el.pathSegList.getItem(el.pathSegList.numberOfItems - 1).pathSegType == SVGPathSeg.PATHSEG_CLOSEPATH) {\n            numberOfVisibleSegments -= 1 // if path is invisible, adding Z does not make it visible\n        }\n\n        return numberOfVisibleSegments\n    },\n\n    addMoveSegment: function(x, y) {\n\n        const el = this.pathNode\n\n        const move = el.createSVGPathSegMovetoAbs(x, y)\n\n        el.pathSegList.appendItem(move)\n\n        this.trigger('path:segment:add', el)\n        this.trigger('path:move-segment:add', el)\n    },\n\n    addLineSegment: function(x, y) {\n\n        const el = this.pathNode\n\n        const line = el.createSVGPathSegLinetoAbs(x, y)\n\n        el.pathSegList.appendItem(line)\n\n        this.trigger('path:segment:add', el)\n        this.trigger('path:line-segment:add', el)\n    },\n\n    addCurveSegment: function(x, y, x1, y1, x2, y2) {\n\n        const el = this.pathNode\n\n        const curve = el.createSVGPathSegCurvetoCubicAbs(x, y, x1, y1, x2 || x, y2 || y)\n\n        el.pathSegList.appendItem(curve)\n\n        this.trigger('path:segment:add', el)\n        this.trigger('path:curve-segment:add', el)\n    },\n\n    adjustLastSegment: function(x, y, x1, y1, x2, y2) {\n\n        const el = this.pathNode\n\n        const segment = el.pathSegList.getItem(el.pathSegList.numberOfItems - 1)\n\n        if (x !== null) segment.x = x\n        if (y !== null) segment.y = y\n        if (x1 !== null) segment.x1 = x1\n        if (y1 !== null) segment.y1 = y1\n        if (x2 !== null) segment.x2 = x2\n        if (y2 !== null) segment.y2 = y2\n\n        this.trigger('path:edit', el)\n        this.trigger('path:last-segment:adjust', el)\n    },\n\n    removeLastSegment: function() {\n\n        const el = this.pathNode\n\n        el.pathSegList.removeItem(el.pathSegList.numberOfItems - 1)\n\n        this.trigger('path:edit', el)\n        this.trigger('path:last-segment:remove', el)\n    },\n\n    findControlPoint: function(x, y) {\n\n        const el = this.pathNode\n        const last = el.pathSegList.getItem(el.pathSegList.numberOfItems - 1)\n\n        return g.point(x, y).reflection(last)\n    },\n\n    replaceLastSegmentWithCurve: function() {\n\n        const el = this.pathNode\n\n        const last = el.pathSegList.getItem(el.pathSegList.numberOfItems - 1)\n        const prev = el.pathSegList.getItem(el.pathSegList.numberOfItems - 2)\n\n        const curve = el.createSVGPathSegCurvetoCubicAbs(last.x, last.y, prev.x, prev.y, last.x, last.y)\n\n        el.pathSegList.replaceItem(curve, el.pathSegList.numberOfItems - 1)\n\n        this.trigger('path:edit', el)\n        this.trigger('path:last-segment:replace-with-curve', el)\n    },\n\n    adjustControlPath: function(x1, y1, x2, y2) {\n\n        const el = this.pathNode\n        const control = this.svgControl.node\n\n        control.pathSegList.initialize(control.createSVGPathSegMovetoAbs(x1, y1))\n        control.pathSegList.appendItem(control.createSVGPathSegLinetoAbs(x2, y2))\n\n        this.vel.append(control)\n\n        this.trigger('path:interact', el)\n        this.trigger('path:control:adjust', el)\n    },\n\n    removeControlPath: function() {\n\n        const el = this.pathNode\n        const control = this.svgControl.node\n\n        control.pathSegList.clear()\n\n        this.vel.append(control)\n\n        this.trigger('path:interact', el)\n        this.trigger('path:control:remove', el)\n    },\n\n    //////////////\n    // Handlers //\n    //////////////\n\n    onPointerDown: function(e) {\n\n        const evt = joint.util.normalizeEvent(e)\n\n        evt.stopPropagation()\n\n        // left button only (or touch)\n        if (evt.which > 1) return\n\n        // first click only (if this was part of a double click)\n        if (evt.originalEvent.detail > 1) return\n\n        // check if we are in the DOM (after remove)\n        if (!this.el.parentNode) return\n\n        const coordinates = this.vel.toLocalPoint(evt.clientX, evt.clientY)\n\n        switch (this.action) {\n\n            case 'awaiting-input':\n                this.createPath(coordinates.x, coordinates.y)\n                this.action = 'path-created'\n                this.delegateDocumentEvents()\n                break\n\n            case 'adjusting-line-end':\n                this.action = 'awaiting-line-end'\n                break\n\n            case 'adjusting-curve-end':\n                this.action = 'awaiting-curve-control-2'\n                break\n        }\n\n        this._timeStamp = evt.timeStamp\n    },\n\n    MOVEMENT_DETECTION_THRESHOLD: 150,\n\n    onPointerMove: function(e) {\n\n        const evt = joint.util.normalizeEvent(e)\n\n        evt.stopPropagation()\n\n        if (this.action == 'awaiting-input') return\n\n        let start\n        let control\n\n        const end = this.vel.toLocalPoint(evt.clientX, evt.clientY)\n\n        const timeStamp = this._timeStamp\n\n        if (!timeStamp) {\n            // mouse button is not pressed\n\n            switch (this.action) {\n\n                case 'adjusting-line-end':\n                    this.adjustLastSegment(end.x, end.y)\n                    break\n\n                case 'adjusting-curve-end':\n                    this.adjustLastSegment(end.x, end.y, null, null, end.x, end.y)\n                    break\n            }\n\n        } else if (timeStamp && ((evt.timeStamp - timeStamp) < this.MOVEMENT_DETECTION_THRESHOLD)) {\n            // mouse button is pressed but threshold for detecting movement has not been reached yet\n            // keep following user pointer to prevent jumpy interface effects\n\n            switch (this.action) {\n\n                case 'path-created':\n                    start = this.svgStart.translate()\n                    this.adjustControlPath(start.tx, start.ty, end.x, end.y)\n                    break\n\n                case 'awaiting-line-end':\n                case 'adjusting-curve-control-1':\n                    this.adjustLastSegment(end.x, end.y)\n                    break\n\n                case 'awaiting-curve-control-2':\n                    this.adjustLastSegment(end.x, end.y, null, null, end.x, end.y)\n                    break\n            }\n\n        } else {\n            // mouse button is pressed and movement is being detected\n\n            switch (this.action) {\n\n                case 'path-created':\n                    this.action = 'adjusting-curve-control-1'\n                    break\n\n                case 'awaiting-line-end':\n                    this.replaceLastSegmentWithCurve()\n                    this.action = 'adjusting-curve-control-2'\n                    break\n\n                case 'awaiting-curve-control-2':\n                    this.action = 'adjusting-curve-control-2'\n                    break\n\n                case 'adjusting-curve-control-1':\n                    start = this.svgStart.translate()\n                    this.adjustControlPath(start.tx, start.ty, end.x, end.y)\n                    break\n\n                case 'adjusting-curve-control-2':\n                    control = this.findControlPoint(end.x, end.y)\n                    this.adjustLastSegment(null, null, null, null, control.x, control.y)\n                    this.adjustControlPath(control.x, control.y, end.x, end.y)\n                    break\n            }\n        }\n    },\n\n    onPointerUp: function(e) {\n\n        this._timeStamp = null\n\n        const evt = joint.util.normalizeEvent(e)\n\n        evt.stopPropagation()\n\n        // left button only (or touch)\n        if (evt.which > 1) return\n\n        // first click only (if this was part of a double click)\n        if (evt.originalEvent.detail > 1) return\n\n        const end = this.vel.toLocalPoint(evt.clientX, evt.clientY)\n\n        switch (this.action) {\n\n            case 'path-created':\n            case 'awaiting-line-end':\n                this.addLineSegment(end.x, end.y)\n                this.action = 'adjusting-line-end'\n                break\n\n            case 'awaiting-curve-control-2':\n                this.removeControlPath()\n                this.addLineSegment(end.x, end.y)\n                this.action = 'adjusting-line-end'\n                break\n\n            case 'adjusting-curve-control-1':\n            case 'adjusting-curve-control-2':\n                this.addCurveSegment(end.x, end.y, end.x, end.y)\n                this.action = 'adjusting-curve-end'\n                break\n        }\n    },\n\n    onStartPointPointerDown: function(e) {\n\n        const evt = joint.util.normalizeEvent(e)\n\n        evt.stopPropagation()\n\n        // left button only (or touch)\n        if (evt.which > 1) return\n\n        // first click only (if this was part of a double click)\n        if (evt.originalEvent.detail > 1) return\n\n        this.closePath()\n    },\n\n    onDoubleClick: function(e) {\n\n        const evt = joint.util.normalizeEvent(e)\n\n        evt.preventDefault()\n        evt.stopPropagation()\n\n        // left button only (or touch)\n        if (evt.which > 1) return\n\n        if (this.pathNode && this.numberOfVisibleSegments() > 0) {\n\n            // remove the path element created by first click's mousedown\n            this.removeLastSegment()\n\n            this.finishPath('path:stop')\n        }\n    },\n\n    onContextMenu: function(e) {\n\n        const evt = joint.util.normalizeEvent(e)\n\n        evt.preventDefault()\n        evt.stopPropagation()\n\n        // first click only (if this was part of a double click)\n        if (evt.originalEvent.detail > 1) return\n\n        if (this.pathNode && this.numberOfVisibleSegments() > 0) {\n\n            // remove currently edited path segment\n            this.removeLastSegment()\n\n            this.finishPath('path:stop')\n        }\n    }\n\n})\n\njoint.ui.PathEditor = joint.mvc.View.extend({\n\n    tagName: 'g',\n\n    svgElement: true,\n\n    className: 'path-editor',\n\n    events: {\n        'mousedown .anchor-point': 'onAnchorPointPointerDown',\n        'mousedown .control-point': 'onControlPointPointerDown',\n        'mousedown .segment-path': 'onSegmentPathPointerDown',\n        //'mousemove': 'onPointerMove', // only bound (while mousedown)\n        //'mouseup': 'onPointerUp', // only bound (ends mousedown)\n        'touchstart .anchor-point': 'onAnchorPointPointerDown',\n        'touchstart .control-point': 'onControlPointPointerDown',\n        'touchstart .segment-path': 'onSegmentPathPointerDown',\n        //'touchmove': 'onPointerMove', // only bound (while touch)\n        //'touchup': 'onPointerUp', // only bound (ends touch)\n        'dblclick .anchor-point': 'onAnchorPointDoubleClick',\n        'dblclick .control-point': 'onControlPointDoubleClick',\n        'dblclick .segment-path': 'onSegmentPathDoubleClick'\n    },\n\n    documentEvents: {\n        mousemove: 'onPointerMove',\n        touchmove: 'onPointerMove',\n        mouseup: 'onPointerUp',\n        touchend: 'onPointerUp',\n        touchcancel: 'onPointerUp',\n    },\n\n    options: {\n        anchorPointMarkup: '<circle r=\"2.5\"/>',\n        controlPointMarkup: '<circle r=\"2.5\"/>'\n    },\n\n    init: function() {\n\n        const pathNode = this.pathNode = V(this.options.pathElement).normalizePath().node\n\n        this.segList = pathNode.pathSegList\n        this.svgRoot = V(pathNode.ownerSVGElement)\n        this.$document = $(pathNode.ownerDocument)\n\n        this.render()\n    },\n\n    onRemove: function() {\n\n        this.undelegateDocumentEvents()\n        this.clear()\n    },\n\n    clear: function() {\n\n        const {vel} = this\n        vel.empty()\n\n        this.directionPaths = []\n        this.segmentPaths = []\n        this.controlPoints = []\n        this.anchorPoints = []\n\n        // first subPath always start at index '0'\n        this._subPathIndices = [0]\n\n        this.trigger('clear', this.pathNode)\n    },\n\n    _transformPoint: function(x, y, matrix) {\n        return V.transformPoint(g.Point(x, y), matrix)\n    },\n\n    render: function() {\n\n        this.clear()\n\n        const {vel} = this\n\n        const ctm = this.pathNode.getCTM()\n\n        const anchorTpl = V(this.options.anchorPointMarkup).addClass('anchor-point')\n        const controlTpl = V(this.options.controlPointMarkup).addClass('control-point')\n        const directionPathTpl = V('<path class=\"direction-path\"/>')\n        const segPathTpl = V('<path class=\"segment-path\"/>')\n\n        const {segList} = this\n\n        const {anchorPoints} = this\n        const {controlPoints} = this\n        const {directionPaths} = this\n        const {segmentPaths} = this\n\n        const {_subPathIndices} = this\n\n        let index\n        let prevX\n        let prevY\n        for (index = 0, prevX = 0, prevY = 0; index < segList.numberOfItems; index++) {\n\n            const seg = segList.getItem(index)\n\n            const segPoint = this._transformPoint(seg.x, seg.y, ctm)\n            let {x} = segPoint\n            let {y} = segPoint\n\n            if (seg.pathSegType != SVGPathSeg.PATHSEG_CLOSEPATH) {\n\n                anchorPoints[index] = anchorTpl.clone().attr({\n                    index: index,\n                    cx: x,\n                    cy: y\n                })\n            }\n\n            if (seg.pathSegType != SVGPathSeg.PATHSEG_MOVETO_ABS) {\n\n                const segPath = segPathTpl.clone().attr('index', index).node\n                segPath.pathSegList.initialize(segPath.createSVGPathSegMovetoAbs(prevX, prevY))\n\n                switch (seg.pathSegType) {\n\n                    case SVGPathSeg.PATHSEG_CLOSEPATH:\n                        var subPathStartSeg = segList.getItem(_subPathIndices[0])\n\n                        var subPathStartSegPoint = this._transformPoint(subPathStartSeg.x, subPathStartSeg.y, ctm)\n                        x = subPathStartSegPoint.x\n                        y = subPathStartSegPoint.y\n\n                        segPath.pathSegList.appendItem(segPath.createSVGPathSegLinetoAbs(x, y))\n                        _subPathIndices.unshift(index + 1)\n                        break\n\n                    case SVGPathSeg.PATHSEG_LINETO_ABS:\n                        segPath.pathSegList.appendItem(segPath.createSVGPathSegLinetoAbs(x, y))\n                        break\n\n                    case SVGPathSeg.PATHSEG_CURVETO_CUBIC_ABS:\n                        var controlSegPoint1 = this._transformPoint(seg.x1, seg.y1, ctm)\n                        var controlPt1 = controlTpl.clone().attr({\n                            index: index,\n                            'attribute-index': 1,\n                            cx: controlSegPoint1.x,\n                            cy: controlSegPoint1.y\n                        })\n\n                        var controlSegPoint2 = this._transformPoint(seg.x2, seg.y2, ctm)\n                        var controlPt2 = controlTpl.clone().attr({\n                            index: index,\n                            'attribute-index': 2,\n                            cx: controlSegPoint2.x,\n                            cy: controlSegPoint2.y\n                        })\n\n                        controlPoints[index] = [controlPt1, controlPt2]\n\n                        segPath.pathSegList.appendItem(segPath.createSVGPathSegCurvetoCubicAbs(x, y, controlSegPoint1.x, controlSegPoint1.y, controlSegPoint2.x, controlSegPoint2.y))\n\n                        directionPaths[index] = [\n                            directionPathTpl.clone().attr('d', ['M', prevX, prevY, 'L', controlSegPoint1.x, controlSegPoint1.y].join(' ')),\n                            directionPathTpl.clone().attr('d', ['M', x, y, 'L', controlSegPoint2.x, controlSegPoint2.y].join(' '))\n                        ]\n                        break\n                }\n\n                segmentPaths[index] = segPath\n            }\n\n            prevX = x\n            prevY = y\n\n        }\n\n        const elements = []\n        segmentPaths.forEach(function(segment) {\n            if (segment) elements.push(segment)\n        })\n        directionPaths.forEach(function(direction) {\n            if (direction) Array.prototype.push.apply(elements, direction)\n        })\n        anchorPoints.forEach(function(anchor) {\n            if (anchor) elements.push(anchor)\n        })\n        controlPoints.forEach(function(control) {\n            if (control) Array.prototype.push.apply(elements, control)\n        })\n\n        vel.append(elements)\n\n        this.svgRoot.append(vel)\n    },\n\n    startMoving: function(e) {\n\n        const evt = joint.util.normalizeEvent(e)\n\n        const $point = this.$point = $(evt.target)\n\n        this.prevClientX = evt.clientX\n        this.prevClientY = evt.clientY\n\n        const index = parseInt(this.$point.attr('index'), 10)\n\n        if ($point.hasClass('anchor-point')) {\n\n            this.trigger('path:interact')\n            this.trigger('path:anchor-point:select', index)\n            // first clickable anchor point is 0\n\n        } else if ($point.hasClass('control-point')) {\n\n            const controlPointIndex = this.$point.attr('attribute-index')\n            this.trigger('path:interact')\n            this.trigger('path:control-point:select', index, controlPointIndex)\n            // the index refers to the index of the curveto segment this control point belongs to\n            // curveto path's control point 1 has index 1, control point 2 has index 2\n            // first clickable control point is at 1, 1 (even though the point has a direction path connected to anchor point 0)\n\n        } else {\n\n            this.trigger('path:interact')\n            this.trigger('path:segment:select', index)\n            // first clickable segment is segment 1\n            // segment 0 is the first M segment (which has no path)\n\n        }\n\n        evt.stopPropagation()\n        evt.preventDefault()\n\n        this.pathEditedEventType = null\n    },\n\n    move: function(e) {\n\n        const {$point} = this\n\n        if (!$point) return\n\n        // move anchor and control points\n        const evt = joint.util.normalizeEvent(e)\n        const dx = evt.clientX - this.prevClientX\n        const dy = evt.clientY - this.prevClientY\n\n        const index = parseInt($point.attr('index'), 10)\n\n        if ($point.hasClass('anchor-point')) {\n\n            // move anchor point\n            this.adjustAnchorPoint(index, dx, dy)\n\n        } else if ($point.hasClass('control-point')) {\n\n            // move control point\n            const controlPointIndex = $point.attr('attribute-index')\n            this.adjustControlPoint(index, controlPointIndex, dx, dy)\n\n        } else {\n\n            // move segment path\n            this.adjustAnchorPoint(index - 1, dx, dy)\n            this.adjustAnchorPoint(index, dx, dy)\n\n        }\n\n        // move the direction paths\n\n        this.prevClientX = evt.clientX\n        this.prevClientY = evt.clientY\n    },\n\n    adjustControlPoint: function(index, controlPointIndex, dx, dy) {\n\n        // get the path transformation matrix\n        const ctm = this.pathNode.getCTM()\n\n        const {segList} = this\n\n        // the raw path data is not transformed\n        const seg = segList.getItem(index)\n\n        const {controlPoints} = this\n\n        // the client movement data is transformed because it comes from interaction events in a transformed viewport\n        // convert to untransformed coordinates to match the path's underlying representation (untransformed)\n        const inverseCTM = ctm.inverse()\n        // translations are ignored since we are interested in differences in position\n        inverseCTM.e = 0\n        inverseCTM.f = 0\n        const movePoint = this._transformPoint(dx, dy, inverseCTM)\n\n        // apply untransformed client movement data to untransformed path data\n        const xA = `x${  controlPointIndex}`\n        const yA = `y${  controlPointIndex}`\n        seg[xA] += movePoint.x\n        seg[yA] += movePoint.y\n\n        // convert to transformed coordinates to match how path is rendered on screen\n        const controlSegPoint = this._transformPoint(seg[xA], seg[yA], ctm)\n        const controlPt = controlPoints[index][controlPointIndex - 1].attr({\n            cx: controlSegPoint.x,\n            cy: controlSegPoint.y\n        })\n\n        if (controlPt.hasClass('locked')) {\n\n            // this control point is locked with another control point\n            // we also need to modify the bound control point\n            const boundIndex = this.getBoundIndex(index, controlPointIndex)\n            const boundControlPointIndex = ((controlPointIndex == 1) ? 2 : 1)\n            const bindSeg = segList.getItem(boundIndex)\n\n            // recalculate bound point with untransformed coordinates\n            const xB = `x${  boundControlPointIndex}`\n            const yB = `y${  boundControlPointIndex}`\n            const center = g.point(((controlPointIndex == 1) ? bindSeg.x : seg.x), ((controlPointIndex == 1) ? bindSeg.y : seg.y))\n            const controlPos = g.point(seg[xA], seg[yA])\n            const distance = center.distance(g.Point(bindSeg[xB], bindSeg[yB]))\n            const bindControlPos = center.move(controlPos, distance)\n            bindSeg[xB] = bindControlPos.x\n            bindSeg[yB] = bindControlPos.y\n\n            // convert to transformed coodinates\n            const bindControlSegPoint = this._transformPoint(bindSeg[xB], bindSeg[yB], ctm)\n            controlPoints[boundIndex][boundControlPointIndex - 1].attr({\n                cx: bindControlSegPoint.x,\n                cy: bindControlSegPoint.y\n            })\n\n            // update paths involving bound control point\n            this.updateDirectionPaths(boundIndex)\n            this.updateSegmentPath(boundIndex)\n        }\n\n        // update paths involving control point\n        this.updateDirectionPaths(index)\n        this.updateSegmentPath(index)\n\n        this.pathEditedEventType = 'path:control-point:adjust'\n    },\n\n    findSubpathIndex: function(index) {\n\n        const indices = this._subPathIndices\n        for (let i = 0, n = indices.length; i < n; i++) {\n            if (indices[i] < index) return indices[i]\n        }\n        return undefined\n    },\n\n    findReversedSubpathIndex: function(index) {\n\n        const indices = this._subPathIndices\n        for (let i = indices.length - 1; i >= 0; i--) {\n            if (indices[i] > index) return indices[i]\n        }\n        return undefined\n    },\n\n    adjustAnchorPoint: function(index, dx, dy) {\n\n        // get the path transformation matrix\n        const ctm = this.pathNode.getCTM()\n\n        const {segList} = this\n\n        // the raw path data is not transformed\n        let seg = segList.getItem(index)\n        if (seg.pathSegType == SVGPathSeg.PATHSEG_CLOSEPATH) {\n            index = this.findSubpathIndex(index)\n            seg = segList.getItem(index)\n        }\n\n        const {anchorPoints} = this\n        const {controlPoints} = this\n\n        // if we move either endpoint, control points across start anchor point must be unlocked\n        const lastIndex = anchorPoints.length - 1\n        if ((index === 0 || index === lastIndex) && controlPoints[1] && controlPoints[lastIndex]) {\n            const controlPoint1 = controlPoints[1][0]\n            const controlPoint2 = controlPoints[lastIndex][1]\n\n            if (controlPoint1 && controlPoint1.hasClass('locked')) controlPoint1.removeClass('locked')\n            if (controlPoint2 && controlPoint2.hasClass('locked')) controlPoint2.removeClass('locked')\n        }\n\n        // the client movement data is transformed because it comes from interaction events in a transformed viewport\n        // convert to untransformed coordinates to match the path's underlying representation (untransformed)\n        const inverseCTM = ctm.inverse()\n        // translations are ignored since we are interested in differences in position\n        inverseCTM.e = 0\n        inverseCTM.f = 0\n        const movePoint = this._transformPoint(dx, dy, inverseCTM)\n\n        // apply untransformed client movement data to untransformed path data\n        seg.x += movePoint.x\n        seg.y += movePoint.y\n\n        // convert to transformed coordinates to match how path is rendered on screen\n        const segPoint = this._transformPoint(seg.x, seg.y, ctm)\n        anchorPoints[index].attr({\n            cx: segPoint.x,\n            cy: segPoint.y\n        })\n\n        if (seg.pathSegType == SVGPathSeg.PATHSEG_CURVETO_CUBIC_ABS) {\n            // apply untransformed client movement data to untransformed path data\n            seg.x2 += movePoint.x\n            seg.y2 += movePoint.y\n\n            // convert to transformed coordinates\n            const controlSegPoint = this._transformPoint(seg.x2, seg.y2, ctm)\n            controlPoints[index][1].attr({\n                cx: controlSegPoint.x,\n                cy: controlSegPoint.y\n            })\n        }\n\n        const nextSeg = ((index + 1) < segList.numberOfItems) ? segList.getItem(index + 1) : 0\n\n        if (nextSeg) {\n            if (nextSeg.pathSegType == SVGPathSeg.PATHSEG_CURVETO_CUBIC_ABS) {\n                // apply untransformed client movement data to untransformed path data\n                nextSeg.x1 += movePoint.x\n                nextSeg.y1 += movePoint.y\n\n                // convert to transformed coordinates\n                const nextControlSegPoint = this._transformPoint(nextSeg.x1, nextSeg.y1, ctm)\n                controlPoints[index + 1][0].attr({\n                    cx: nextControlSegPoint.x,\n                    cy: nextControlSegPoint.y\n                })\n\n                // update control paths involving next anchor point\n                this.updateDirectionPaths(index + 1)\n            }\n\n            // update segment path involving next anchor point\n            this.updateSegmentPath(index + 1)\n        }\n\n        // update paths involving this anchor point\n        this.updateDirectionPaths(index)\n        this.updateSegmentPath(index)\n\n        this.pathEditedEventType = 'path:anchor-point:adjust'\n    },\n\n    // updates paths from a given segment to control points\n    updateDirectionPaths: function(index) {\n\n        // get the path transformation matrix\n        const ctm = this.pathNode.getCTM()\n\n        const {segList} = this\n\n        // raw path data is unconverted\n        // convert to transformed coordinates to match how path is rendered on screen\n        const seg = segList.getItem(index)\n        const segPoint = this._transformPoint(seg.x, seg.y, ctm)\n\n        // make sure that previous segment exists\n        const prevSeg = (index > 0) ? segList.getItem(index - 1) : null\n        const prevSegPoint = prevSeg ? this._transformPoint(prevSeg.x, prevSeg.y, ctm) : null\n\n        // for each direction path from this anchor point\n        const directionPaths = this.directionPaths[index]\n        if (!Array.isArray(directionPaths)) return\n        directionPaths.forEach(function(directionPath, i) {\n\n            i++\n\n            const controlSegPoint = this._transformPoint(seg[`x${  i}`], seg[`y${  i}`], ctm)\n\n            // update the path with transformed coordinates\n            directionPath.attr('d', [\n                'M',\n                (i > 1 || !prevSeg) ? segPoint.x : prevSegPoint.x,\n                (i > 1 || !prevSeg) ? segPoint.y : prevSegPoint.y,\n                controlSegPoint.x,\n                controlSegPoint.y\n            ].join(' '))\n\n        }, this)\n    },\n\n    // updates given path\n    updateSegmentPath: function(index) {\n\n        const {segList} = this\n\n        const {_subPathIndices} = this\n\n        if (_subPathIndices.includes(index)) {\n\n            let segMaxIndex = this.findReversedSubpathIndex(index) || segList.numberOfItems\n\n            segMaxIndex--\n\n            if (segList.getItem(segMaxIndex).pathSegType != SVGPathSeg.PATHSEG_CLOSEPATH) return\n\n            index = segMaxIndex\n        }\n\n        // first segment (index = 0) is always 'M' and such it has no segmentPath\n        const segPath = this.segmentPaths[index]\n        if (!segPath) return\n\n        // get the path transformation matrix\n        const ctm = this.pathNode.getCTM()\n\n        // there is always a previous segment because we are skipping over the first segment\n        // raw path data is untransformed\n        // convert to transformed coordinates to match how path is rendered on screen\n        const prevSeg = segList.getItem(index - 1)\n        const prevSegPoint = this._transformPoint(prevSeg.x, prevSeg.y, ctm)\n        // create the updated path\n        let item = segPath.createSVGPathSegMovetoAbs(prevSegPoint.x, prevSegPoint.y)\n        segPath.pathSegList.initialize(item)\n\n        // transform path data to match path rendering\n        const seg = segList.getItem(index)\n        const segPoint = this._transformPoint(seg.x, seg.y, ctm)\n\n        switch (seg.pathSegType) {\n\n            case SVGPathSeg.PATHSEG_CLOSEPATH:\n                // transform path data to match path rendering\n                var nextSeg = segList.getItem(this.findSubpathIndex(index))\n                var nextSegPoint = this._transformPoint(nextSeg.x, nextSeg.y, ctm)\n                item = segPath.createSVGPathSegLinetoAbs(nextSegPoint.x, nextSegPoint.y)\n                break\n\n            case SVGPathSeg.PATHSEG_LINETO_ABS:\n                item = segPath.createSVGPathSegLinetoAbs(segPoint.x, segPoint.y)\n                break\n\n            case SVGPathSeg.PATHSEG_CURVETO_CUBIC_ABS:\n                // transform control point data to match path rendering\n                var controlSegPoint1 = this._transformPoint(seg.x1, seg.y1, ctm)\n                var controlSegPoint2 = this._transformPoint(seg.x2, seg.y2, ctm)\n                item = segPath.createSVGPathSegCurvetoCubicAbs(segPoint.x, segPoint.y, controlSegPoint1.x, controlSegPoint1.y, controlSegPoint2.x, controlSegPoint2.y)\n                break\n        }\n\n        segPath.pathSegList.appendItem(item)\n    },\n\n    stopMoving: function() {\n\n        this.$point = null\n\n        // only trigger events after the moving stops\n        if (this.pathEditedEventType) {\n            const {pathNode} = this\n\n            this.trigger('path:edit', pathNode)\n            this.trigger(this.pathEditedEventType, pathNode)\n        }\n\n        this.pathEditedEventType = null\n    },\n\n    createAnchorPoint: function(e) {\n\n        const evt = joint.util.normalizeEvent(e)\n        const index = V(evt.target).attr('index')\n        const {pathNode} = this\n        const {segList} = this\n\n        const pt = V(pathNode).toLocalPoint(evt.pageX, evt.pageY)\n        const seg = segList.getItem(index)\n\n        switch (seg.pathSegType) {\n\n            case SVGPathSeg.PATHSEG_CLOSEPATH:\n            case SVGPathSeg.PATHSEG_LINETO_ABS:\n                segList.insertItemBefore(pathNode.createSVGPathSegLinetoAbs(pt.x, pt.y), index)\n                break\n\n            case SVGPathSeg.PATHSEG_CURVETO_CUBIC_ABS:\n                var pseg = segList.getItem(index - 1)\n                var p0 = g.point(pseg.x, pseg.y)\n                var p1 = g.point(seg.x1, seg.y1)\n                var p2 = g.point(seg.x2, seg.y2)\n                var p3 = g.point(seg.x, seg.y)\n\n                // Inversion of Bezier curve\n                var t = g.bezier.getInversionSolver(p0, p1, p2, p3)(pt)\n\n                // TODO: wen a curve is a straight line we will get inaccurate results\n                if (t < 0) return\n\n                // Divide a Bezier curve into two\n                var curves = g.bezier.getCurveDivider(p0, p1, p2, p3)(t)\n\n                segList.insertItemBefore(pathNode.createSVGPathSegCurvetoCubicAbs(\n                    curves[0].p3.x,\n                    curves[0].p3.y,\n                    curves[0].p1.x,\n                    curves[0].p1.y,\n                    curves[0].p2.x,\n                    curves[0].p2.y\n                ), index)\n\n                seg.x1 = curves[1].p1.x\n                seg.y1 = curves[1].p1.y\n                seg.x2 = curves[1].p2.x\n                seg.y2 = curves[1].p2.y\n                break\n        }\n\n        this.render()\n\n        this.trigger('path:edit', pathNode)\n        this.trigger('path:anchor-point:create', pathNode)\n    },\n\n    removeAnchorPoint: function(e) {\n\n        const evt = joint.util.normalizeEvent(e)\n        const index = parseInt($(evt.target).attr('index'), 10)\n\n        const {pathNode} = this\n        const {segList} = this\n\n        const seg = segList.getItem(index)\n\n        let nseg\n        let rseg\n\n        switch (seg.pathSegType) {\n\n            case SVGPathSeg.PATHSEG_MOVETO_ABS:\n                // replace following segment with moveto\n                // then delete this moveto\n                nseg = segList.getItem(index + 1)\n                rseg = pathNode.createSVGPathSegMovetoAbs(nseg.x, nseg.y)\n                segList.replaceItem(rseg, index + 1)\n                segList.removeItem(index)\n                break\n\n            case SVGPathSeg.PATHSEG_LINETO_ABS:\n                // just remove this segment\n                segList.removeItem(index)\n                break\n\n            case SVGPathSeg.PATHSEG_CURVETO_CUBIC_ABS:\n                // replace following curve's control point 1 with this curve's control point 1\n                // if not followed by a curve, then discard the curve information\n                // then delete this curveto\n                if ((index + 1) <= (segList.numberOfItems - 1)) {\n                    nseg = segList.getItem(index + 1)\n                    if (nseg.pathSegType == SVGPathSeg.PATHSEG_CURVETO_CUBIC_ABS) {\n                        nseg.x1 = seg.x1\n                        nseg.y1 = seg.y1\n                    }\n                }\n                segList.removeItem(index)\n                break\n        }\n\n        this.render()\n\n        this.trigger('path:edit', pathNode)\n        this.trigger('path:anchor-point:remove', pathNode)\n\n        let numAnchorPoints = segList.numberOfItems\n        if (segList.getItem(segList.numberOfItems - 1).pathSegType == SVGPathSeg.PATHSEG_CLOSEPATH) {\n            numAnchorPoints -= 1\n        }\n\n        if (numAnchorPoints < 2) {\n            // the path has too few points to be seen\n            this.trigger('path:invalid', pathNode)\n        }\n    },\n\n    lockControlPoint: function(e) {\n\n        const evt = joint.util.normalizeEvent(e)\n        const evtTarget = $(evt.target)\n\n        const {pathNode} = this\n\n        const index = parseInt(evtTarget.attr('index'))\n        const controlPointIndex = evtTarget.attr('attribute-index')\n\n        const boundIndex = this.getBoundIndex(index, controlPointIndex)\n        const boundControlPointIndex = ((controlPointIndex == 1) ? 2 : 1)\n\n        const boundControlPoint = this.controlPoints[boundIndex]\n\n        if (boundControlPoint) {\n\n            const isLocked = evtTarget.hasClass('locked')\n\n            evtTarget.toggleClass('locked')\n            boundControlPoint[boundControlPointIndex - 1].toggleClass('locked')\n\n            this.trigger('path:interact')\n            if (!isLocked) this.trigger('path:control-point:lock', index, controlPointIndex)\n            else this.trigger('path:control-point:unlock', index, controlPointIndex)\n\n            this.adjustControlPoint(index, controlPointIndex, 0, 0) // updates pathEditedEventType\n            this.trigger('path:edit', pathNode)\n            this.trigger(this.pathEditedEventType, pathNode)\n            this.pathEditedEventType = null\n        }\n    },\n\n    getBoundIndex: function(index, controlPointIndex) {\n\n        let boundIndex\n\n        const {segList} = this\n        let lastSegIndex\n        let lastSegType\n        let closepathPresent\n\n        const {anchorPoints} = this\n        const lastIndex = anchorPoints.length - 1\n        let endpointsIdenticalX\n        let endpointsIdenticalY\n\n        if (controlPointIndex == 1) {\n\n            boundIndex = index - 1\n\n            if (boundIndex === 0) {\n                // if we are trying to wrap past the start element\n\n                lastSegIndex = segList.numberOfItems - 1\n                lastSegType = segList.getItem(lastSegIndex).pathSegType\n                closepathPresent = (lastSegType == SVGPathSeg.PATHSEG_CLOSEPATH)\n\n                endpointsIdenticalX = anchorPoints[0].attr('cx') === anchorPoints[lastIndex].attr('cx')\n                endpointsIdenticalY = anchorPoints[0].attr('cy') === anchorPoints[lastIndex].attr('cy')\n\n                if (closepathPresent && endpointsIdenticalX && endpointsIdenticalY) {\n                    // there is a closepath segment between the start element and the last element AND\n                    // the start element and the last element have the same coordinates\n                    // (that is, the two curves look like any other curve join in the path)\n\n                    boundIndex = lastIndex // wrap to the last element\n\n                } // else leave the index at 0 (no control points correspond to the index)\n            }\n\n        } else {\n\n            boundIndex = index + 1\n\n            if (boundIndex === (lastIndex + 1)) {\n                // if we are trying to wrap past the last element\n\n                lastSegIndex = segList.numberOfItems - 1\n                lastSegType = segList.getItem(lastSegIndex).pathSegType\n                closepathPresent = (lastSegType == SVGPathSeg.PATHSEG_CLOSEPATH)\n\n                endpointsIdenticalX = anchorPoints[0].attr('cx') === anchorPoints[lastIndex].attr('cx')\n                endpointsIdenticalY = anchorPoints[0].attr('cy') === anchorPoints[lastIndex].attr('cy')\n\n                if (closepathPresent && endpointsIdenticalX && endpointsIdenticalY) {\n                    // there is a closepath segment between the last element and the start element AND\n                    // the start element and the last element have the same coordinates\n                    // (that is, the two curves look like any other curve join in the path)\n\n                    boundIndex = 1 // wrap to the first element\n\n                } // else leave the index at (lastIndex + 1) (no control points correspond to the index)\n            }\n        }\n\n        return boundIndex\n    },\n\n    getControlPointLockedStates: function() {\n\n        const {controlPoints} = this\n\n        const lockedStates = []\n        for (let index = 0; index < controlPoints.length; index++) {\n\n            if (!controlPoints[index]) continue\n\n            lockedStates[index] = []\n            for (let j = 0; j <= 1; j++) {\n\n                if (!controlPoints[index][j]) continue\n\n                const controlPointIndex = j + 1\n\n                if (controlPoints[index][j].hasClass('locked')) {\n                    lockedStates[index][controlPointIndex] = true\n\n                } else {\n                    lockedStates[index][controlPointIndex] = false\n                }\n            }\n        }\n\n        return lockedStates\n    },\n\n    setControlPointLockedStates: function(lockedStates) {\n\n        const {controlPoints} = this\n\n        for (let index = 0; index < controlPoints.length; index++) {\n\n            if (!lockedStates[index]) continue\n            if (!controlPoints[index]) continue\n\n            for (let controlPointIndex = 1; controlPointIndex <= 2; controlPointIndex++) {\n\n                if (!lockedStates[index][controlPointIndex]) continue\n                if (!controlPoints[index][controlPointIndex - 1]) continue\n\n                if (lockedStates[index][controlPointIndex] === true) {\n                    controlPoints[index][controlPointIndex - 1].addClass('locked')\n                } else {\n                    controlPoints[index][controlPointIndex - 1].removeClass('locked')\n                }\n            }\n        }\n    },\n\n    convertSegmentPath: function(e) {\n\n        const evt = joint.util.normalizeEvent(e)\n        const index = V(evt.target).attr('index')\n\n        const {pathNode} = this\n        const {segList} = this\n\n        const seg = segList.getItem(index)\n\n        let pseg\n        let nseg\n\n        switch (seg.pathSegType) {\n\n            case SVGPathSeg.PATHSEG_CLOSEPATH:\n                // converts closepath to curveto path\n                // takes the coordinates of the initial point as destination coordinates\n                // creates a duplicate point at initial point (no way around this in svg)\n                // no way to reverse this duplication\n                // reconnects with another closepath\n                pseg = segList.getItem(index - 1)\n                nseg = segList.getItem(0)\n                segList.insertItemBefore(pathNode.createSVGPathSegCurvetoCubicAbs(nseg.x, nseg.y, pseg.x, pseg.y, nseg.x, nseg.y), index)\n                break\n\n            case SVGPathSeg.PATHSEG_LINETO_ABS:\n                // converts lineto path to curveto path\n                // puts control points at the locations of the two endpoints of the line\n                pseg = segList.getItem(index - 1)\n                segList.replaceItem(pathNode.createSVGPathSegCurvetoCubicAbs(seg.x, seg.y, pseg.x, pseg.y, seg.x, seg.y), index)\n                break\n\n            case SVGPathSeg.PATHSEG_CURVETO_CUBIC_ABS:\n                // converts curveto path to lineto path\n                // endpoints stay endpoints, but curve information discarded\n                segList.replaceItem(pathNode.createSVGPathSegLinetoAbs(seg.x, seg.y), index)\n                break\n        }\n\n        this.render()\n\n        this.trigger('path:edit', pathNode)\n        this.trigger('path:segment:convert', pathNode)\n    },\n\n    addClosePathSegment: function(e) {\n\n        const evt = joint.util.normalizeEvent(e)\n        const index = parseInt($(evt.target).attr('index'), 10)\n\n        const {segList} = this\n\n        if (index === 0 || index === segList.numberOfItems - 1) {\n\n            // if the first or last anchor was selected\n            const seg = segList.getItem(segList.numberOfItems - 1)\n            if (seg.pathSegType != SVGPathSeg.PATHSEG_CLOSEPATH) {\n                const {pathNode} = this\n\n                // if the last segment of path is not closepath\n                // add closepath at the end of path\n                segList.appendItem(pathNode.createSVGPathSegClosePath())\n\n                this.render()\n\n                this.trigger('path:edit', pathNode)\n                this.trigger('path:closepath-segment:add', pathNode)\n            }\n        }\n    },\n\n    removeClosePathSegment: function(e) {\n\n        const evt = joint.util.normalizeEvent(e)\n        const index = V(evt.target).attr('index')\n\n        const {segList} = this\n\n        const seg = segList.getItem(index)\n\n        if (seg.pathSegType == SVGPathSeg.PATHSEG_CLOSEPATH) {\n            const {pathNode} = this\n\n            segList.removeItem(index)\n\n            this.render()\n\n            this.trigger('path:edit', pathNode)\n            this.trigger('path:closepath-segment:remove', pathNode)\n        }\n    },\n\n    //////////////\n    // Handlers //\n    //////////////\n\n    onAnchorPointPointerDown: function(e) {\n\n        const evt = joint.util.normalizeEvent(e)\n\n        evt.stopPropagation()\n\n        // left button only\n        if (evt.which !== 1) return\n\n        // first click only (if this was part of a double click)\n        if (evt.originalEvent.detail > 1) return\n\n        this.startMoving(evt)\n\n        this.delegateDocumentEvents()\n    },\n\n    onControlPointPointerDown: function(e) {\n\n        const evt = joint.util.normalizeEvent(e)\n\n        evt.stopPropagation()\n\n        // left button only\n        if (evt.which !== 1) return\n\n        // first click only (if this was part of a double click)\n        if (evt.originalEvent.detail > 1) return\n\n        this.startMoving(evt)\n\n        this.delegateDocumentEvents()\n    },\n\n    onSegmentPathPointerDown: function(e) {\n\n        const evt = joint.util.normalizeEvent(e)\n\n        evt.stopPropagation()\n\n        // left button only\n        if (evt.which !== 1) return\n\n        // first click only (if this was part of a double click)\n        if (evt.originalEvent.detail > 1) return\n\n        this.startMoving(evt)\n\n        this.delegateDocumentEvents()\n    },\n\n    onPointerMove: function(e) {\n\n        const evt = joint.util.normalizeEvent(e)\n\n        evt.stopPropagation()\n\n        this.move(evt)\n\n    },\n\n    onPointerUp: function(e) {\n\n        this.undelegateDocumentEvents()\n\n        const evt = joint.util.normalizeEvent(e)\n\n        evt.stopPropagation()\n\n        this.stopMoving()\n\n    },\n\n    onAnchorPointDoubleClick: function(e) {\n\n        const evt = joint.util.normalizeEvent(e)\n\n        evt.stopPropagation()\n        evt.preventDefault()\n\n        // left button only\n        if (evt.which !== 1) return\n\n        this.removeAnchorPoint(evt) // default user interaction method\n\n        // alternative method that could be called by this interaction:\n        //this.addClosePathSegment(evt);\n    },\n\n    onControlPointDoubleClick: function(e) {\n\n        const evt = joint.util.normalizeEvent(e)\n\n        evt.stopPropagation()\n        evt.preventDefault()\n\n        // left button only\n        if (evt.which !== 1) return\n\n        this.lockControlPoint(evt)\n    },\n\n    onSegmentPathDoubleClick: function(e) {\n\n        const evt = joint.util.normalizeEvent(e)\n\n        evt.stopPropagation()\n        evt.preventDefault()\n\n        // left button only\n        if (evt.which !== 1) return\n\n        this.createAnchorPoint(evt) // default user interaction method\n\n        // alternative methods that could be called by this interaction:\n        //this.convertSegmentPath(evt);\n        //this.removeClosePathSegment(evt);\n    }\n})\n\n// Force Directed layout implementation.\n// =====================================\n\n// Resources:\n//      Efficient and High Quality Force-Directed Graph Drawing, Yifan Hu\n//      Simple Algorithms for Network Visualization: A Tutorial, Michael J. McGuffin\n//      Graph Drawing by Force-directed Placement, Thomas M. J. Fruchterman and Edward M. Reingold\n//      D3.js, http://d3js.org\n\njoint.layout.ForceDirected = Backbone.Model.extend({\n\n    defaults: {\n\n        linkDistance: 10,\n        linkStrength: 1,\n        charge: 10\n    },\n\n    initialize: function(opt) {\n\n        this.elements = this.get('graph').getElements()\n        this.links = this.get('graph').getLinks()\n        this.cells = this.get('graph').get('cells')\n        this.width = this.get('width')\n        this.height = this.get('height')\n        this.gravityCenter = this.get('gravityCenter')\n\n        this.t = 1\n        this.energy = Infinity\n        this.progress = 0\n    },\n\n    start: function() {\n\n        const w = this.get('width')\n        const h = this.get('height')\n\n        // Random layout.\n        this.elements.forEach(function(el) {\n\n            el.set('position', {\n                x: Math.random() * w,\n                y: Math.random() * h\n            })\n\n            // Cache important values for much quick access.\n            el.charge = el.get('charge') || this.get('charge')\n            el.weight = el.get('weight') || 1\n            const pos = el.get('position')\n            el.x = pos.x\n            el.y = pos.y\n\n            // Previous position.\n            el.px = el.x\n            el.py = el.y\n\n            el.fx = 0\n            el.fy = 0\n\n        }, this)\n\n        this.links.forEach(function(link) {\n\n            // Cache important values for quick access.\n            link.strength = link.get('strength') || this.get('linkStrength')\n            link.distance = link.get('distance') || this.get('linkDistance')\n\n            link.source = this.cells.get(link.get('source').id)\n            link.target = this.cells.get(link.get('target').id)\n\n        }, this)\n    },\n\n    step: function() {\n\n        if ((this.t * .99) < 0.005) return this.notifyEnd()\n\n        const w = this.width\n        const h = this.height\n\n        const gravity = .1\n        const {gravityCenter} = this\n\n        const energyBefore = this.energy\n        this.energy = 0\n\n        // Global positions update. Sum of all the position updates to elements.\n        let xBefore = 0\n        let yBefore = 0\n        let xAfter = 0\n        let yAfter = 0\n\n        let i; let j\n        const nElements = this.elements.length\n        const nLinks = this.links.length\n\n        let v; let u; let dx; let dy; let distanceSquared; let distance; let fr; let fx; let fy\n\n        // Calculate repulsive forces.\n        for (i = 0; i < nElements - 1; i++) {\n\n            v = this.elements[i]\n            xBefore += v.x\n            yBefore += v.y\n\n            for (j = i + 1; j < nElements; j++) {\n\n                u = this.elements[j]\n                dx = u.x - v.x\n                dy = u.y - v.y\n                distanceSquared = dx * dx + dy * dy\n                distance = Math.sqrt(distanceSquared)\n\n                fr = this.t * v.charge / distanceSquared\n                fx = fr * dx\n                fy = fr * dy\n\n                v.fx -= fx\n                v.fy -= fy\n                u.fx += fx\n                u.fy += fy\n\n                this.energy += fx * fx + fy * fy\n            }\n        }\n\n        // Add the last element positions as it couldn't be done in the loops above.\n        xBefore += this.elements[nElements - 1].x\n        yBefore += this.elements[nElements - 1].y\n\n        let link; let fa; let k\n\n        // Calculate attractive forces.\n        for (i = 0; i < nLinks; i++) {\n\n            link = this.links[i]\n            v = link.source\n            u = link.target\n\n            dx = u.x - v.x\n            dy = u.y - v.y\n            distanceSquared = dx * dx + dy * dy\n            distance = Math.sqrt(distanceSquared)\n\n            fa = this.t * link.strength * (distance - link.distance) / distance\n            fx = fa * dx\n            fy = fa * dy\n            k = v.weight / (v.weight + u.weight)\n\n            // Gauss-seidel. Changing positions directly so that other iterations work with the new positions.\n            v.x += fx * (1 - k)\n            v.y += fy * (1 - k)\n            u.x -= fx * k\n            u.y -= fy * k\n\n            this.energy += fx * fx + fy * fy\n        }\n\n        let el; let pos\n\n        // Set positions on elements.\n        for (i = 0; i < nElements; i++) {\n\n            el = this.elements[i]\n            pos = { x: el.x, y: el.y }\n\n            // Gravity force.\n            if (gravityCenter) {\n\n                pos.x += (gravityCenter.x - pos.x) * this.t * gravity\n                pos.y += (gravityCenter.y - pos.y) * this.t * gravity\n            }\n\n            pos.x += el.fx\n            pos.y += el.fy\n\n            // Make sure positions don't go out of the paper area.\n            pos.x = Math.max(0, Math.min(w, pos.x))\n            pos.y = Math.max(0, Math.min(h, pos.y))\n\n            // Position Verlet integration.\n            const friction = .9\n            pos.x += (el.px - pos.x) * friction\n            pos.y += (el.py - pos.y) * friction\n\n            el.px = pos.x\n            el.py = pos.y\n\n            el.fx = el.fy = 0\n            el.x = pos.x\n            el.y = pos.y\n\n            xAfter += el.x\n            yAfter += el.y\n\n            this.notify(el, i, pos)\n        }\n\n        this.t = this.cool(this.t, this.energy, energyBefore)\n\n        // If the global distance hasn't change much, the layout converged and therefore trigger the `end` event.\n        const gdx = xBefore - xAfter\n        const gdy = yBefore - yAfter\n        const gd = Math.sqrt(gdx * gdx + gdy * gdy)\n        if (gd < 1) {\n            this.notifyEnd()\n        }\n    },\n\n    cool: function(t, energy, energyBefore) {\n\n        // Adaptive cooling scheme (as per Yifan Hu). The temperature can also increase depending on the progress made.\n        if (energy < energyBefore) {\n\n            this.progress += 1\n            if (this.progress >= 5) {\n\n                this.progress = 0\n                return t / .99// Warm up.\n            }\n        } else {\n\n            this.progress = 0\n            return t * .99// Cool down.\n        }\n        return t// Keep the same temperature.\n    },\n\n    notify: function(el, i, pos) {\n\n        el.set('position', pos)\n    },\n\n    notifyEnd: function() {\n\n        this.trigger('end')\n    }\n})\n\njoint.layout = joint.layout || {}\n\njoint.layout.GridLayout = {\n\n    layout: function(graphOrCells, opt) {\n\n        let graph\n\n        if (graphOrCells instanceof joint.dia.Graph) {\n            graph = graphOrCells\n        } else {\n            // `dry: true` for not overriding original graph reference\n            // `sort: false` to prevent elements to change their order based on the z-index\n            graph = (new joint.dia.Graph()).resetCells(graphOrCells, { dry: true, sort: false })\n        }\n\n        // This is not needed anymore.\n        graphOrCells = null\n\n        opt = opt || {}\n\n        const elements = graph.getElements()\n\n        // number of columns\n        const columns = opt.columns || 1\n        const rows = Math.ceil(elements.length / columns)\n        // shift the element horizontally by a given amount\n        const dx = opt.dx || 0\n\n        // shift the element vertically by a given amount\n        const dy = opt.dy || 0\n        // position the elements in the centre of a grid cell\n        const centre = opt.centre === undefined || opt.centre !== false\n\n        // resize the elements to fit a grid cell & preserves ratio\n        const resizeToFit = !!opt.resizeToFit\n\n        // coordinates of the most top-left element.\n        const marginX = opt.marginX || 0\n        const marginY = opt.marginY || 0\n\n        // width of a column\n        const columnWidths = []\n        let {columnWidth} = opt\n        if (columnWidth === 'compact') {\n\n            for (let cIndex = 0; cIndex < columns; cIndex++) {\n                const elementsAtColumn = this._elementsAtColumn(elements, cIndex, columns)\n                columnWidths.push(this._maxDim(elementsAtColumn, 'width') + dx)\n            }\n        } else {\n            if (!columnWidth || joint.util.isString(columnWidth)) {\n                columnWidth = this._maxDim(elements, 'width') + dx\n            }\n            for (let i = 0; i < columns; i++) {\n                columnWidths.push(columnWidth)\n            }\n        }\n\n        const columnsX = this._accumulate(columnWidths, marginX)\n\n        // height of a row\n        const rowHeights = []\n        let {rowHeight} = opt\n        if (rowHeight === 'compact') {\n            for (let rIndex = 0; rIndex < rows; rIndex++) {\n                const elementsAtRow = this._elementsAtRow(elements, rIndex, columns)\n                rowHeights.push(this._maxDim(elementsAtRow, 'height') + dy)\n            }\n        } else {\n            if (!rowHeight || joint.util.isString(rowHeight)) {\n                rowHeight = this._maxDim(elements, 'height') + dy\n            }\n\n            for (let j = 0; j < rows; j++) {\n                rowHeights.push(rowHeight)\n            }\n        }\n\n        const rowsY = this._accumulate(rowHeights, marginY)\n\n        // Wrap all graph changes into a batch.\n        graph.startBatch('layout')\n\n        // iterate the elements and position them accordingly\n        elements.forEach(function(element, index) {\n\n            const cIndex = index % columns\n            const rIndex = Math.floor(index / columns)\n            const cWidth = columnWidths[cIndex]\n            const rHeight = rowHeights[rIndex]\n\n            let cx = 0\n            let cy = 0\n            let elementSize = element.get('size')\n\n            if (resizeToFit) {\n\n                let elementWidth = cWidth - 2 * dx\n                let elementHeight = rHeight - 2 * dy\n\n                const calcElHeight = elementSize.height * (elementSize.width ? elementWidth / elementSize.width : 1)\n                const calcElWidth = elementSize.width * (elementSize.height ? elementHeight / elementSize.height : 1)\n\n                if (calcElHeight > rHeight) {\n                    elementWidth = calcElWidth\n                } else {\n                    elementHeight = calcElHeight\n                }\n\n                elementSize = { width: elementWidth, height: elementHeight }\n                element.set('size', elementSize, opt)\n            }\n\n            if (centre) {\n                cx = (cWidth - elementSize.width) / 2\n                cy = (rHeight - elementSize.height) / 2\n            }\n\n            element.position(columnsX[cIndex] + dx + cx, rowsY[rIndex] + dy + cy, opt)\n        })\n\n        graph.stopBatch('layout')\n    },\n\n    // find maximal dimension (width/height) in an array of the elements\n    _maxDim: function(elements, dimension) {\n        return elements.reduce(function(max, el) {\n            return Math.max(el.get('size')[dimension], max)\n        }, 0)\n    },\n\n    _elementsAtRow: function(elements, rowIndex, numberOfColumns) {\n        const elementsAtRow = []\n        let i = numberOfColumns * rowIndex\n        const n = i + numberOfColumns\n        for (; i < n; i++) {\n            elementsAtRow.push(elements[i])\n        }\n        return elementsAtRow\n    },\n\n    _elementsAtColumn: function(elements, columnIndex, numberOfColumns) {\n        const elementsAtColumn = []\n        let i = columnIndex\n        const n = elements.length\n        for (; i < n; i += numberOfColumns) {\n            elementsAtColumn.push(elements[i])\n        }\n        return elementsAtColumn\n    },\n\n    _accumulate: function(array, baseVal) {\n        return array.reduce(function(res, val, i) {\n            res.push(res[i] + val)\n            return res\n        }, [baseVal || 0])\n    }\n};\n\n// Tree Graph Layout.\n// ==================\n\n(function(joint, Backbone, g) {\n\n    // Layout Siblings\n    // ===============\n    // a group of sibling layout areas\n\n    function LayoutSiblings(layoutAreas, parentArea, opt) {\n\n        opt = joint.util.defaults(opt || {}, { siblingGap: 0 })\n\n        this.width = 0\n        this.height = 0\n        this.layoutAreas = this.sortLayoutAreas(layoutAreas)\n        this.parentArea = parentArea\n        this.siblingGap = opt.siblingGap\n        if (this.exists()) {\n            this.computeSize(opt)\n        }\n    }\n\n    joint.util.assign(LayoutSiblings.prototype, {\n\n        sortLayoutAreas: function(layoutAreas) {\n\n            const areas = joint.util.sortBy(layoutAreas, 'siblingRank')\n\n            // re-number the sibling ranks\n            areas.forEach(function(area, index) {\n                area.siblingRank = index\n            })\n\n            return areas\n        },\n\n        move: function(dx, dy) {\n            for (let i = 0, n = this.layoutAreas.length; i < n; i++) {\n                this.layoutAreas[i].dx += dx\n                this.layoutAreas[i].dy += dy\n            }\n        },\n\n        exists: function() {\n            return this.layoutAreas.length > 0\n        },\n\n        sumGaps: function(gap) {\n            const gapCount = Math.max(this.layoutAreas.length - 1, 0)\n            return gapCount * gap\n        },\n\n        getSiblingRankByPoint: function(point) {\n\n            if (!this.exists()) {\n                // minimal extreme\n                return -1\n            }\n\n            const closestArea = this.findAreaByPoint(point)\n            if (!closestArea) {\n                // maximal extreme\n                return this.layoutAreas.length - 1\n            }\n\n            return closestArea.siblingRank - 1\n        },\n\n        getFirstChildConnectionPoints: function() {\n\n            return []\n        },\n\n        getConnectionPoints: function(point, opt) {\n\n            if (!this.exists()) {\n                return this.getFirstChildConnectionPoints(point)\n            }\n\n            const deltaCoordinates = {\n                dx: point.x - this.parentArea.rootCX,\n                dy: point.y - this.parentArea.rootCY\n            }\n\n            return this.layoutAreas[0].getRootVertices(deltaCoordinates, opt)\n        },\n\n        getParentConnectionPoint: function() {\n\n            const {parentArea} = this\n            const offset = this.proxyLayoutArea('getConnectionPoint', parentArea.rootSize)\n            const connectionPoint = g.point(parentArea.rootCX, parentArea.rootCY)\n\n            return connectionPoint.offset(offset.x, offset.y)\n        },\n\n        getChildConnectionPoint: function(point, rootSize) {\n\n            const offset = this.proxyLayoutArea('getConnectionPoint', rootSize)\n            return g.point(point).difference(offset)\n        },\n\n        proxyLayoutArea: function(method) {\n\n            const args = Array.prototype.slice.call(arguments, 1)\n            return LayoutArea.fromDirection(this.direction).prototype[method].apply(this.parentArea, args)\n        }\n    })\n\n    LayoutSiblings.extend = Backbone.Model.extend\n\n    const VerticalLayoutSiblings = LayoutSiblings.extend({\n\n        // Y coordinate of the most top sibling\n        getTopDY: function() {\n            return -this.height / 2\n        },\n\n        findAreaByPoint: function(point) {\n\n            return this.layoutAreas.find(function(area) {\n                return area.rootCY > point.y\n            })\n        },\n\n        computeSize: function(opt) {\n\n            // compute height of all the siblings\n            this.height = this.sumGaps(opt.siblingGap)\n            const {layoutAreas} = this\n\n            this.height += layoutAreas.reduce(function(res, area) {\n                return res + area.height + area.prevSiblingGap + area.nextSiblingGap\n            }, 0)\n\n            layoutAreas.reduce(function(y, area) {\n                // check if the current siblings width changed\n                this.width = Math.max(this.width, area.getExtendedWidth())\n                // set the shift of the area\n                area.dy += y + area.getCY()\n                // return the y-coordinate of the next sibling\n                return y + area.prevSiblingGap + area.height + area.nextSiblingGap + opt.siblingGap\n            }.bind(this),  this.getTopDY())\n        },\n\n        getYTowardsParent: function() {\n\n            return this.parentArea.rootCY\n        },\n\n        getXTowardsParent: function() {\n\n            const {parentArea} = this\n            return parentArea.rootCX + this.LRSign * (parentArea.rootSize.width / 2 + parentArea.gap)\n        },\n\n        getNeighborPointFromRank: function(rank) {\n\n            let y\n            const {siblingGap} = this\n\n            if (!this.exists()) {\n\n                y = this.getYTowardsParent()\n\n            } else {\n\n                const prevArea = this.layoutAreas[rank]\n                const nextArea = this.layoutAreas[rank + 1]\n\n                if (!prevArea) {\n                    y = nextArea.y - siblingGap / 2\n                } else if (!nextArea) {\n                    y = prevArea.y + prevArea.height + siblingGap / 2\n                } else {\n                    y = (prevArea.y + prevArea.height + nextArea.y) / 2\n                }\n            }\n\n            return {\n                x: this.getXTowardsParent(),\n                y: y\n            }\n        }\n\n    })\n\n    const LeftLayoutSiblings = VerticalLayoutSiblings.extend({\n\n        direction: 'L',\n        LRSign: -1\n    })\n\n    const RightLayoutSiblings = VerticalLayoutSiblings.extend({\n\n        direction: 'R',\n        LRSign: 1\n    })\n\n    // Vertical Tree Layout Siblings\n\n    const treeLayoutSiblings = {\n\n        getXTowardsParent: function() {\n\n            const {parentArea} = this\n            return parentArea.rootCX + this.LRSign *  parentArea.gap\n        },\n\n        getYTowardsParent: function() {\n\n            const {parentArea} = this\n            let dy = parentArea.getLRHeight(parentArea.siblings) / 2\n            dy += Math.min(parentArea.firstChildGap, this.siblingGap / 2)\n\n            return parentArea.rootCY + this.TBSign * dy\n        },\n\n        getFirstChildConnectionPoints: function(point) {\n\n            return [g.point(this.parentArea.rootCX, point.y)]\n        },\n\n        getChildConnectionPoint: function(point, rootSize) {\n\n            return g.point(point).offset(-this.LRSign * rootSize.width / 2, 0)\n        },\n\n        getParentConnectionPoint: function() {\n\n            const {parentArea} = this\n            const connectionPoint = g.point(parentArea.rootCX, parentArea.rootCY)\n            return connectionPoint.offset(0, this.TBSign * parentArea.rootSize.height / 2)\n        }\n    }\n\n    const bottomTreeLayoutSiblings = {\n\n        getTopDY: function() {\n            return 0\n        }\n    }\n\n    const topTreeLayoutSiblings = {\n\n        getTopDY: function() {\n            return -this.height\n        }\n    }\n\n    const BottomRightLayoutSiblings = VerticalLayoutSiblings.extend({\n\n        direction: 'BR',\n        LRSign: 1,\n        TBSign: 1\n    })\n    joint.util.assign(BottomRightLayoutSiblings.prototype, treeLayoutSiblings, bottomTreeLayoutSiblings)\n\n    const BottomLeftLayoutSiblings = VerticalLayoutSiblings.extend({\n\n        direction: 'BL',\n        LRSign: -1,\n        TBSign: 1\n    })\n    joint.util.assign(BottomLeftLayoutSiblings.prototype, treeLayoutSiblings, bottomTreeLayoutSiblings)\n\n    const TopRightLayoutSiblings = VerticalLayoutSiblings.extend({\n\n        direction: 'TR',\n        LRSign: 1,\n        TBSign: -1\n    })\n    joint.util.assign(TopRightLayoutSiblings.prototype, treeLayoutSiblings, topTreeLayoutSiblings)\n\n    const TopLeftLayoutSiblings = VerticalLayoutSiblings.extend({\n\n        direction: 'TL',\n        LRSign: -1,\n        TBSign: -1\n    })\n    joint.util.assign(TopLeftLayoutSiblings.prototype, treeLayoutSiblings, topTreeLayoutSiblings)\n\n\n    // Horizontal Layout Siblings\n\n    const HorizontalLayoutSiblings = LayoutSiblings.extend({\n\n        // X coordinate of the most left sibling\n        getLeftDX: function() {\n            return -this.width / 2\n        },\n\n        findAreaByPoint: function(point) {\n\n            return this.layoutAreas.find(function(area) {\n                return area.rootCX > point.x\n            })\n        },\n\n        computeSize: function(opt) {\n\n            this.width = this.sumGaps(opt.siblingGap)\n            const {layoutAreas} = this\n\n            this.width += layoutAreas.reduce(function(res, area) {\n                return res + area.width + area.prevSiblingGap + area.nextSiblingGap\n            }, 0)\n\n            layoutAreas.reduce(function(x, area) {\n                // check if the current siblings height changed\n                this.height = Math.max(this.height, area.getExtendedHeight())\n                // set the shift of the area\n                area.dx += x + area.getCX()\n                // return the x-coordinate of the next sibling\n                return x + area.prevSiblingGap + area.width + area.nextSiblingGap + opt.siblingGap\n            }.bind(this), this.getLeftDX())\n        },\n\n        getNeighborPointFromRank: function(rank) {\n\n            let x\n\n            if (!this.exists()) {\n\n                x = this.parentArea.rootCX\n\n            } else {\n\n                const prevArea = this.layoutAreas[rank]\n                const nextArea = this.layoutAreas[rank + 1]\n\n                if (!prevArea) {\n                    x = nextArea.x - this.siblingGap / 2\n                } else if (!nextArea) {\n                    x = prevArea.x + prevArea.width + this.siblingGap / 2\n                } else {\n                    x = (prevArea.x + prevArea.width + nextArea.x) / 2\n                }\n            }\n\n            return {\n                x: x,\n                y: this.getYTowardsParent()\n            }\n        }\n    })\n\n    const TopLayoutSiblings = HorizontalLayoutSiblings.extend({\n\n        direction: 'T',\n\n        getYTowardsParent: function() {\n\n            const {parentArea} = this\n            return parentArea.rootCY - parentArea.getLRHeight() / 2 - parentArea.gap\n        }\n    })\n\n    const BottomLayoutSiblings = HorizontalLayoutSiblings.extend({\n\n        direction: 'B',\n\n        getYTowardsParent: function() {\n\n            const {parentArea} = this\n            return parentArea.rootCY + parentArea.getLRHeight() / 2 + parentArea.gap\n        }\n    })\n\n    // Layout Area\n    // ===========\n\n    function LayoutArea(root, opt) {\n\n        this.root = root\n\n        const options = joint.util.assign({}, opt, this.getRootAttributes(root, opt.attributeNames))\n        const globalGap = opt.gap || 0\n\n        joint.util.defaults(options, {\n            parentGap: globalGap,\n            siblingGap: globalGap,\n            firstChildGap: globalGap\n        })\n\n        this.siblingRank = options.siblingRank\n        this.rootOffset = options.rootOffset\n        this.rootMargin = options.rootMargin\n        // Gaps\n        this.siblingGap = options.siblingGap\n        this.gap = this.parentGap = options.parentGap\n        this.nextSiblingGap = options.nextSiblingGap\n        this.prevSiblingGap = options.prevSiblingGap\n        this.firstChildGap = options.firstChildGap\n        // metrics\n        this.dx = 0\n        this.dy = 0\n        this.width = 0\n        this.height = 0\n    }\n\n    joint.util.assign(LayoutArea, {\n\n        create: function(direction, root, opt) {\n\n            const constructor = LayoutArea.fromDirection(direction, opt)\n            return new constructor(root, opt)\n        },\n\n        fromDirection: function(direction, opt) {\n\n            let constructor\n\n            switch (direction) {\n                case 'L':\n                    constructor = LeftLayoutArea\n                    break\n                case 'T':\n                    constructor = TopLayoutArea\n                    break\n                case 'R':\n                    constructor = RightLayoutArea\n                    break\n                case 'B':\n                    constructor = BottomLayoutArea\n                    break\n                case 'BR':\n                    constructor = BottomRightLayoutArea\n                    break\n                case 'BL':\n                    constructor = BottomLeftLayoutArea\n                    break\n                case 'TR':\n                    constructor = TopRightLayoutArea\n                    break\n                case 'TL':\n                    constructor = TopLeftLayoutArea\n                    break\n                default:\n                    constructor = LayoutArea\n            }\n\n            return constructor\n        }\n\n    })\n\n    joint.util.assign(LayoutArea.prototype, {\n\n        direction: null,\n\n        compute: function(childLayoutAreas) {\n            this.childAreas = childLayoutAreas\n            this.computeRelativePosition(this.root, childLayoutAreas)\n        },\n\n        // Returs height of the layout area\n        getHeight: function(siblings, rootSize) {\n\n            return this.getTHeight(siblings) + this.getBHeight(siblings) + this.getLRHeight()\n        },\n\n        // Returs width of the layout area\n        getWidth: function(siblings, rootSize) {\n\n            const tbWidth = Math.max(siblings.T.width, siblings.B.width) / 2\n\n            const lWidth = Math.max(\n                this.getLWidth(siblings, rootSize) + rootSize.width / 2,\n                tbWidth\n            )\n\n            const rWidth = Math.max(\n                this.getRWidth(siblings, rootSize) + rootSize.width / 2,\n                tbWidth\n            )\n\n            return lWidth + rWidth\n        },\n\n        // Returns height of layout area taken only L,R siblings into account\n        getLRHeight: function() {\n\n            return Math.max(this.rootSize.height, this.siblings.L.height, this.siblings.R.height)\n        },\n\n        // Returns height of the all top siblings (T,TR,TL)\n        getTHeight: function(siblings) {\n\n            return siblings.T.height + this.getTXHeight(siblings)\n        },\n\n        // Returns height of the all bottom siblings (B,BR,BL)\n        getBHeight: function(siblings) {\n\n            return siblings.B.height + this.getBXHeight(siblings)\n        },\n\n        // Returns width of layout area without T,B siblings\n        getXLRWidth: function(siblings, rootSize) {\n\n            return this.getLWidth(siblings, rootSize) + rootSize.width + this.getRWidth(siblings, rootSize)\n        },\n\n        // Returns width of both right tree siblings (TR,BR)\n        getXRWidth: function(siblings, rootSize) {\n\n            let xrWidth = Math.max(siblings.BR.width, siblings.TR.width)\n            if (xrWidth > 0) {\n                xrWidth -= rootSize.width / 2\n            }\n\n            return xrWidth\n        },\n\n        // Returns height of both top tree siblings (TR,TL)\n        getTXHeight: function(siblings) {\n\n            let txHeight = Math.max(siblings.TR.height, siblings.TL.height)\n            if (txHeight > 0) {\n                txHeight += this.firstChildGap\n            }\n\n            return txHeight\n        },\n\n        // Returns height of both bottom tree siblings (BR,BL)\n        getBXHeight: function(siblings) {\n\n            let bxHeight = Math.max(siblings.BR.height, siblings.BL.height)\n            if (bxHeight > 0) {\n                bxHeight += this.firstChildGap\n            }\n\n            return bxHeight\n        },\n\n        // Returns width of both right tree siblings (BL,TL)\n        getXLWidth: function(siblings, rootSize) {\n\n            let xlWidth = Math.max(siblings.BL.width, siblings.TL.width)\n            if (xlWidth > 0) {\n                xlWidth -= rootSize.width / 2\n            }\n\n            return xlWidth\n        },\n\n        // Returs width of all the right siblings (R, TR, BR)\n        getRWidth: function(siblings, rootSize) {\n\n            return Math.max(siblings.R.width, this.getXRWidth(siblings, rootSize))\n        },\n\n        // Returs width of all the left siblings (L, TL, BL)\n        getLWidth: function(siblings, rootSize) {\n\n            return Math.max(siblings.L.width, this.getXLWidth(siblings, rootSize))\n        },\n\n        // Returns T,B siblings width that overlaps root element.\n        getTBOverlap: function(siblings, rootSize) {\n\n            let tbOverlap = Math.max(siblings.T.width, siblings.B.width)\n            if (tbOverlap > 0) {\n                tbOverlap -= rootSize.width\n                tbOverlap /= 2\n            }\n\n            return tbOverlap\n        },\n\n        getRootDX: function(siblings, rootSize) {\n\n            const tbOverlap = this.getTBOverlap(siblings, rootSize)\n\n            let dx = Math.max(this.getLWidth(siblings, rootSize), tbOverlap)\n            dx -= Math.max(this.getRWidth(siblings, rootSize), tbOverlap)\n\n            return dx / 2\n        },\n\n        // Returns the minimum amnogst various gaps.\n        getMinimalGap: function(siblings) {\n\n            return Math.min(siblings.siblingGap, this.firstChildGap, this.parentGap)\n        },\n\n        getBBox: function(opt) {\n\n            const bbox = g.rect(this)\n            const pad = opt && opt.expandBy\n\n            if (pad) {\n\n                bbox.moveAndExpand({\n                    x: - pad,\n                    y: - pad,\n                    width: pad * 2,\n                    height: pad * 2\n                })\n            }\n\n            return bbox\n        },\n\n        containsPoint: function(point, opt) {\n\n            return this.getBBox(opt).containsPoint(point)\n        },\n\n        getLayoutSiblings: function(direction) {\n\n            return this.siblings[direction]\n        },\n\n        getExtendedWidth: function() {\n\n            return this.width + this.gap + this.rootOffset\n        },\n\n        getExtendedHeight: function() {\n\n            return this.height + this.gap + this.rootOffset\n        },\n\n        findMinimalAreaByPoint: function(point, opt) {\n\n            if (!this.containsPoint(point, opt)) {\n                return null\n            }\n\n            let minimalArea\n\n            this.childAreas.some(function(area) {\n                minimalArea = area.findMinimalAreaByPoint(point, opt)\n                return !!minimalArea\n            })\n\n            return minimalArea || this\n        },\n\n        getType: function() {\n\n            return Object.keys(this.siblings).reduce(function(memo, direction) {\n                const siblingGroup = this.siblings[direction]\n                return siblingGroup.exists() ? memo.concat(direction) : memo\n            }.bind(this), []).sort().join('-')\n        },\n\n        getRootAttributes: function(root, attributeNames) {\n\n            const attributes = {\n                rootOffset: root.get(attributeNames.offset || 'offset') || 0,\n                rootMargin: root.get(attributeNames.margin || 'margin') || 0,\n                prevSiblingGap: root.get(attributeNames.prevSiblingGap || 'prevSiblingGap') || 0,\n                nextSiblingGap: root.get(attributeNames.nextSiblingGap || 'nextSiblingGap') || 0\n            }\n\n            const siblingRank = root.get(attributeNames.siblingRank || 'siblingRank')\n            if (joint.util.isNumber(siblingRank)) {\n                attributes.siblingRank = siblingRank\n            }\n\n            const firstChildGap = root.get(attributeNames.firstChildGap || 'firstChildGap')\n            if (joint.util.isNumber(firstChildGap)) {\n                attributes.firstChildGap = firstChildGap\n            }\n\n            return attributes\n        },\n\n        getRootSize: function(root, rootMargin) {\n\n            const rootSize = root.size()\n\n            rootSize[this.marginDimension] += rootMargin\n\n            return rootSize\n        },\n\n        createSiblings: function(childAreas, opt) {\n\n            const groupedAreas = joint.util.groupBy(childAreas, 'direction')\n\n            return {\n                L: new LeftLayoutSiblings(groupedAreas.L, this, opt),\n                T: new TopLayoutSiblings(groupedAreas.T, this, opt),\n                R: new RightLayoutSiblings(groupedAreas.R, this, opt),\n                B: new BottomLayoutSiblings(groupedAreas.B, this, opt),\n                BR: new BottomRightLayoutSiblings(groupedAreas.BR, this, opt),\n                BL: new BottomLeftLayoutSiblings(groupedAreas.BL, this, opt),\n                TR: new TopRightLayoutSiblings(groupedAreas.TR, this, opt),\n                TL: new TopLeftLayoutSiblings(groupedAreas.TL, this, opt)\n            }\n        },\n\n        computeSize: function(siblings, rootSize) {\n\n            return {\n                width: this.getWidth(siblings, rootSize),\n                height: this.getHeight(siblings, rootSize)\n            }\n        },\n\n        computeOrigin: function() {\n\n            const {siblings} = this\n            const {rootSize} = this\n            const maxWidth = Math.max(\n                this.getLWidth(siblings, rootSize) + rootSize.width / 2,\n                this.getXLWidth(siblings, rootSize) + rootSize.width / 2,\n                siblings.T.width / 2,\n                siblings.B.width / 2\n            )\n\n            return {\n                x: this.rootCX - maxWidth,\n                y: this.rootCY - this.getTHeight(siblings) - this.getLRHeight() / 2\n            }\n        },\n\n        moveSiblings: function(siblings, rootSize) {\n\n            if (this.hasHorizontalSiblings(siblings)) {\n\n                const dx = rootSize.width / 2\n                siblings.L.move(-dx , 0)\n                siblings.R.move(dx, 0)\n            }\n\n            if (this.hasVerticalSiblings(siblings)) {\n\n                const dy = this.getLRHeight() / 2\n                siblings.T.move(0, -dy)\n                siblings.B.move(0, dy)\n                siblings.BR.move(0, dy)\n                siblings.BL.move(0, dy)\n                siblings.B.move(0, this.getBXHeight(siblings))\n                siblings.TR.move(0, -dy)\n                siblings.TL.move(0, -dy)\n                siblings.T.move(0, -this.getTXHeight(siblings))\n            }\n        },\n\n        moveRootToConnectionPoint: function(rootSize) {\n\n            const connectionPoint = this.getConnectionPoint(rootSize)\n\n            this.dx += connectionPoint.x\n            this.dy += connectionPoint.y\n        },\n\n        computeRelativePosition: function(root, childAreas) {\n\n            const siblings = this.siblings = this.createSiblings(childAreas, { siblingGap: this.siblingGap })\n            const rootSize = this.rootSize = this.getRootSize(root, this.rootMargin)\n\n            joint.util.assign(this, this.computeSize(siblings, rootSize))\n\n            this.moveSiblings(siblings, rootSize)\n            this.moveRootToConnectionPoint(rootSize)\n            this.moveRootBehindSiblings(siblings, rootSize)\n            this.moveRootFromParent()\n        },\n\n        computeAbsolutePosition: function() {\n\n            if (this.parentArea) {\n                this.rootCX = this.parentArea.rootCX + this.dx\n                this.rootCY = this.parentArea.rootCY + this.dy\n                this.level = this.parentArea.level + 1\n            } else {\n                const rootCenter = this.root.getBBox().center()\n                this.rootCX = rootCenter.x\n                this.rootCY = rootCenter.y\n                this.level = 0\n            }\n\n            joint.util.assign(this, this.computeOrigin())\n        },\n\n        hasVerticalSiblings: function(siblings) {\n\n            return siblings.T.exists() || siblings.B.exists() || siblings.BR.exists() || siblings.BL.exists() || siblings.TR.exists() || siblings.TL.exists()\n        },\n\n        hasHorizontalSiblings: function(siblings) {\n\n            return siblings.L.exists() || siblings.R.exists()\n        },\n\n        isSourceArea: function() {\n\n            return !this.parentArea\n        },\n\n        isSinkArea: function() {\n\n            return this.childAreas.length === 0\n        },\n\n        getRootPosition: function() {\n\n            const rootSize = this.root.get('size')\n\n            return {\n                x: this.rootCX - rootSize.width / 2,\n                y: this.rootCY - rootSize.height / 2\n            }\n        },\n\n        getRootVertices: function(deltaCoordinates, opt) {\n\n            opt = opt || {}\n            deltaCoordinates = deltaCoordinates || this\n\n            if (deltaCoordinates[this.deltaCoordinate] === 0 || !this.parentArea) {\n                // Pure horizontal/vertical link has no vertices.\n                return []\n            }\n\n            const parentInnerSize = this.parentArea.getInnerSize()\n            let relativeVertices\n\n            if (!opt.ignoreSiblings && this.hasSiblingsBetweenParent()) {\n                // vertices avoids the elements between the root and its parent.\n                const oppositeSiblings = this.siblings[this.oppositeDirection]\n                relativeVertices = this.getRelativeVerticesAvoidingSiblings(\n                    parentInnerSize,\n                    deltaCoordinates,\n                    oppositeSiblings\n                )\n            } else {\n                relativeVertices = this.getRelativeVertices(parentInnerSize, deltaCoordinates)\n            }\n\n            return joint.util.invoke(relativeVertices, 'offset', this.parentArea.rootCX, this.parentArea.rootCY)\n        },\n\n        getInnerSize: function() {\n\n            return {\n                width: this.rootSize.width,\n                height: this.getLRHeight()\n            }\n        },\n\n        getConnectionPoint: function() {\n\n            // root area has no connection point\n            return null\n        },\n\n        getRelativeVertices: function() {\n\n            // root area has no inbound link\n            return null\n        },\n\n        moveRootFromParent: function() {\n\n            // root area has no parent\n        },\n\n        moveRootBehindSiblings: function() {\n\n            // root area dx, dy are always 0,0\n        },\n\n        // Is there an element between the root of the area and the parent.\n        hasSiblingsBetweenParent: function() {\n\n            return !this.isSourceArea() && this.siblings[this.oppositeDirection].exists()\n        },\n\n        getCY: function() {\n            return this.height / 2 + this.prevSiblingGap\n        },\n\n        getCX: function() {\n            return this.width / 2 + this.prevSiblingGap\n        }\n\n    })\n\n    LayoutArea.extend = Backbone.Model.extend\n\n    var RightLayoutArea = LayoutArea.extend({\n\n        direction: 'R',\n        oppositeDirection: 'L',\n        deltaCoordinate: 'dx',\n        marginDimension: 'height',\n\n        getConnectionPoint: function(rootSize) {\n\n            return g.point(rootSize.width / 2, 0)\n        },\n\n        moveRootBehindSiblings: function(siblings, rootSize) {\n\n            this.dx += Math.max(\n                this.getLWidth(siblings, rootSize),\n                this.getTBOverlap(siblings, rootSize)\n            )\n\n            this.dy += (this.getTHeight(siblings) - this.getBHeight(siblings)) / 2\n        },\n\n        moveRootFromParent: function() {\n\n            this.dx += this.parentGap + this.rootOffset\n        },\n\n        getRelativeVertices: function(parentRootSize, deltaCoordinates) {\n\n            const connectionPoint = this.getConnectionPoint(parentRootSize)\n            const dx = this.parentGap / 2\n            return [\n                connectionPoint.clone().offset(dx, 0),\n                connectionPoint.clone().offset(dx, deltaCoordinates.dy)\n            ]\n        },\n\n        getRelativeVerticesAvoidingSiblings: function(parentRootSize, deltaCoordinates, lSiblings) {\n\n            const connectionPoint = this.getConnectionPoint(parentRootSize)\n            const gap = lSiblings.siblingGap / 2\n\n            const signY = this.dx > 0 ? -1 : 1\n            const y1 = deltaCoordinates.dy + signY * (lSiblings.height + gap) / 2\n            const y2 = deltaCoordinates.dy + signY * this.rootSize.height / 4\n            const x1 = this.gap / 2\n            const x2 = 1.5 * x1 + Math.max(\n                this.getLWidth(this.siblings, this.rootSize),\n                this.getTBOverlap(this.siblings, this.rootSize)\n            )\n\n            return [\n                connectionPoint.clone().offset(x1, 0),\n                connectionPoint.clone().offset(x1, y1),\n                connectionPoint.clone().offset(x2, y1),\n                connectionPoint.clone().offset(x2, y2)\n            ]\n        }\n    })\n\n    var LeftLayoutArea = LayoutArea.extend({\n\n        direction: 'L',\n        oppositeDirection: 'R',\n        deltaCoordinate: 'dx',\n        marginDimension: 'height',\n\n        getConnectionPoint: function(rootSize) {\n\n            return g.point(- rootSize.width / 2, 0)\n        },\n\n        moveRootBehindSiblings: function(siblings, rootSize) {\n\n            this.dx -= Math.max(\n                this.getRWidth(siblings, rootSize),\n                this.getTBOverlap(siblings, rootSize)\n            )\n\n            this.dy += (this.getTHeight(siblings) - this.getBHeight(siblings)) / 2\n        },\n\n        moveRootFromParent: function() {\n\n            this.dx -= this.parentGap + this.rootOffset\n        },\n\n        getRelativeVertices: function(parentRootSize, deltaCoordinates) {\n\n            const connectionPoint = this.getConnectionPoint(parentRootSize)\n            const dx = -this.parentGap / 2\n            return [\n                connectionPoint.clone().offset(dx, 0),\n                connectionPoint.clone().offset(dx, deltaCoordinates.dy)\n            ]\n        },\n\n        getRelativeVerticesAvoidingSiblings: function(parentRootSize, deltaCoordinates, rSiblings) {\n\n            const connectionPoint = this.getConnectionPoint(parentRootSize)\n\n            const signY = this.dx > 0 ? -1 : 1\n            const y1 = deltaCoordinates.dy + signY * (rSiblings.height + rSiblings.siblingGap / 2) / 2\n            const y2 = deltaCoordinates.dy + signY * this.rootSize.height / 4\n            const x1 = this.gap / 2\n            const x2 = 1.5 * x1 + Math.max(\n                this.getRWidth(this.siblings, this.rootSize),\n                this.getTBOverlap(this.siblings, this.rootSize)\n            )\n\n            return [\n                connectionPoint.clone().offset(-x1, 0),\n                connectionPoint.clone().offset(-x1, y1),\n                connectionPoint.clone().offset(-x2, y1),\n                connectionPoint.clone().offset(-x2, y2)\n            ]\n        }\n    })\n\n    var TopLayoutArea = LayoutArea.extend({\n\n        direction: 'T',\n        oppositeDirection: 'B',\n        deltaCoordinate: 'dy',\n        marginDimension: 'width',\n\n        getConnectionPoint: function(rootSize) {\n\n            return g.point(0, - rootSize.height / 2)\n        },\n\n        moveRootBehindSiblings: function(siblings, rootSize) {\n\n            this.dx += this.getRootDX(siblings, rootSize)\n\n            if (this.hasHorizontalSiblings(siblings)) {\n                this.dy -= (this.getLRHeight() - rootSize.height) / 2\n            }\n            this.dy -= this.getBHeight(siblings)\n        },\n\n        moveRootFromParent: function() {\n\n            this.dy -= this.parentGap + this.rootOffset\n        },\n\n        getRelativeVertices: function(parentRootSize, deltaCoordinates) {\n            const connectionPoint = this.getConnectionPoint(parentRootSize)\n            const dy = -this.getTXHeight(this.parentArea.siblings) - this.parentGap / 2\n            return [\n                connectionPoint.clone().offset(0, dy),\n                connectionPoint.clone().offset(deltaCoordinates.dx, dy)\n            ]\n        },\n\n        getRelativeVerticesAvoidingSiblings: function(parentRootSize, deltaCoordinates) {\n\n            const connectionPoint = this.getConnectionPoint(parentRootSize)\n\n            const {siblings} = this\n            const bSiblings = siblings.B\n\n            // Jump the Top-Right and Top-Left siblings of the parent element\n            const y1 = this.getTXHeight(this.parentArea.siblings) + this.parentGap / 2\n            let y2 = y1 + bSiblings.height\n            // Jump the Bottom-Right and Bottom-Left siblings of the child element\n            y2 += this.getBXHeight(this.siblings) + this.parentGap / 4\n\n            // x1 lies far from the element center\n            const signX = this.dy < 0 ? -1 : 1\n            const bxWidth = siblings[signX > 0 ? 'BR' : 'BL'].width\n            let x1 = deltaCoordinates.dx\n            x1 += signX * (Math.max(bxWidth, bSiblings.width / 2) + bSiblings.siblingGap / 4)\n            // x2 lies closer to the element center\n            const x2 = deltaCoordinates.dx + signX * this.rootSize.width / 4\n\n            return [\n                connectionPoint.clone().offset(0, -y1),\n                connectionPoint.clone().offset(x1, -y1),\n                connectionPoint.clone().offset(x1, -y2),\n                connectionPoint.clone().offset(x2, -y2)\n            ]\n        }\n    })\n\n    var BottomLayoutArea = LayoutArea.extend({\n\n        direction: 'B',\n        oppositeDirection: 'T',\n        deltaCoordinate: 'dy',\n        marginDimension: 'width',\n\n        getConnectionPoint: function(rootSize) {\n\n            return g.point(0, rootSize.height / 2)\n        },\n\n        moveRootBehindSiblings: function(siblings, rootSize) {\n\n            this.dx += this.getRootDX(siblings, rootSize)\n\n            this.dy += this.getTHeight(siblings)\n            if (this.hasHorizontalSiblings(siblings)) {\n                this.dy += (this.getLRHeight() - rootSize.height) / 2\n            }\n        },\n\n        moveRootFromParent: function() {\n\n            this.dy += this.parentGap + this.rootOffset\n        },\n\n        getRelativeVertices: function(parentRootSize, deltaCoordinates) {\n\n            const connectionPoint = this.getConnectionPoint(parentRootSize)\n            const dy = this.getBXHeight(this.parentArea.siblings) + this.parentGap / 2\n            return [\n                connectionPoint.clone().offset(0, dy),\n                connectionPoint.clone().offset(deltaCoordinates.dx, dy)\n            ]\n        },\n\n        getRelativeVerticesAvoidingSiblings: function(parentRootSize, deltaCoordinates) {\n\n            const connectionPoint = this.getConnectionPoint(parentRootSize)\n            const {siblings} = this\n            const tSiblings = siblings.T\n\n            // Jump the Bottom-Right and Bottom-Left siblings of the parent element\n            const y1 = this.getBXHeight(this.parentArea.siblings) + this.parentGap / 2\n            let y2 = y1 + tSiblings.height\n            // Jump the Top-Right and Top-Left siblings of the child element\n            y2 += this.getTXHeight(siblings) + this.parentGap / 4\n\n            // x1 lies far from the element center\n            const signX = this.dy < 0 ? -1 : 1\n            const txWidth = siblings[signX > 0 ? 'TR' : 'TL'].width\n            let x1 = deltaCoordinates.dx\n            x1 += signX * (Math.max(txWidth, tSiblings.width / 2) + tSiblings.siblingGap / 4)\n            // x2 lies close to the element center\n            const x2 = deltaCoordinates.dx + signX * this.rootSize.width / 4\n\n            return [\n                connectionPoint.clone().offset(0, y1),\n                connectionPoint.clone().offset(x1, y1),\n                connectionPoint.clone().offset(x1, y2),\n                connectionPoint.clone().offset(x2, y2)\n            ]\n        }\n    })\n\n    var BottomRightLayoutArea = LayoutArea.extend({\n\n        direction: 'BR',\n        oppositeDirection: 'L',\n        deltaCoordinate: 'dy',\n        marginDimension: 'height',\n\n        getConnectionPoint: function(rootSize) {\n\n            return g.point(0, rootSize.height / 2)\n        },\n\n        getCY: function() {\n\n            return this.prevSiblingGap\n        },\n\n        moveRootBehindSiblings: function(siblings, rootSize) {\n\n            const btWidth = Math.max(siblings.T.width, siblings.B.width)\n            this.dx += Math.max(this.getLWidth(siblings, rootSize), (btWidth - rootSize.width) / 2)\n\n            this.dy += this.getTHeight(siblings)\n            if (this.hasHorizontalSiblings(siblings)) {\n                this.dy += (this.getLRHeight() - rootSize.height) / 2\n            }\n        },\n\n        moveRootFromParent: function() {\n\n            const {parentArea} = this\n            if (parentArea) {\n                this.dy += parentArea.firstChildGap\n            }\n            this.dx += this.rootSize.width / 2 + this.rootOffset + this.parentGap\n        },\n\n        getRelativeVertices: function(parentRootSize, deltaCoordinates) {\n\n            const connectionPoint = this.getConnectionPoint(parentRootSize)\n\n            return [\n                connectionPoint\n                    .clone()\n                    .offset(0, deltaCoordinates.dy - parentRootSize.height / 2)\n            ]\n        },\n\n        getRelativeVerticesAvoidingSiblings: function(parentRootSize, deltaCoordinates, siblings) {\n\n            const x = deltaCoordinates.dx - this.rootSize.width / 4\n            let y = deltaCoordinates.dy\n            y += Math.max(siblings.height, this.rootSize.height) / 2\n            y += this.getMinimalGap(siblings) / 2\n\n            return [\n                g.point(0, y),\n                g.point(x, y)\n            ]\n        }\n    })\n\n    var BottomLeftLayoutArea = LayoutArea.extend({\n\n        direction: 'BL',\n        oppositeDirection: 'R',\n        deltaCoordinate: 'dy',\n        marginDimension: 'height',\n\n        getConnectionPoint: function(rootSize) {\n\n            return g.point(0, rootSize.height / 2)\n        },\n\n        getCY: function() {\n\n            return this.prevSiblingGap\n        },\n\n        moveRootBehindSiblings: function(siblings, rootSize) {\n\n            const btWidth = Math.max(siblings.T.width, siblings.B.width)\n            this.dx -= Math.max(this.getRWidth(siblings, rootSize), (btWidth  - rootSize.width) / 2)\n\n            this.dy += this.getTHeight(siblings)\n            if (this.hasHorizontalSiblings(siblings)) {\n                this.dy += (this.getLRHeight() - rootSize.height) / 2\n            }\n        },\n\n        moveRootFromParent: function() {\n\n            const {parentArea} = this\n            if (parentArea) {\n                this.dy += parentArea.firstChildGap\n            }\n            this.dx -= this.rootSize.width / 2 + this.rootOffset + this.parentGap\n        },\n\n        getRelativeVertices: function(parentRootSize, deltaCoordinates) {\n\n            const connectionPoint = this.getConnectionPoint(parentRootSize)\n\n            return [\n                connectionPoint\n                    .clone()\n                    .offset(0, deltaCoordinates.dy - parentRootSize.height / 2)\n            ]\n        },\n\n        getRelativeVerticesAvoidingSiblings: function(parentRootSize, deltaCoordinates, siblings) {\n\n            const x = deltaCoordinates.dx + this.rootSize.width / 4\n            let y = deltaCoordinates.dy\n            y += Math.max(siblings.height, this.rootSize.height) / 2\n            y += this.getMinimalGap(siblings) / 2\n\n            return [\n                g.point(0, y),\n                g.point(x, y)\n            ]\n        }\n    })\n\n    var TopRightLayoutArea = LayoutArea.extend({\n\n        direction: 'TR',\n        oppositeDirection: 'L',\n        deltaCoordinate: 'dy',\n        marginDimension: 'height',\n\n        getConnectionPoint: function(rootSize) {\n\n            return g.point(0, rootSize.height / 2)\n        },\n\n        getCY: function() {\n\n            return (this.height - this.rootSize.height) + this.prevSiblingGap\n        },\n\n        moveRootBehindSiblings: function(siblings, rootSize) {\n\n            this.dx += Math.max(\n                this.getLWidth(siblings, rootSize),\n                this.getTBOverlap(siblings, rootSize)\n            )\n\n            this.dy -= this.getBHeight(siblings)\n            if (this.hasHorizontalSiblings(siblings)) {\n                this.dy -= (this.getLRHeight() - rootSize.height) / 2\n            }\n        },\n\n        moveRootFromParent: function() {\n\n            const {parentArea} = this\n            if (parentArea) {\n                this.dy -= parentArea.firstChildGap\n            }\n            this.dx += this.rootSize.width / 2 + this.rootOffset + this.parentGap\n        },\n\n        getRelativeVertices: function(parentRootSize, deltaCoordinates) {\n\n            const connectionPoint = this.getConnectionPoint(parentRootSize)\n\n            return [\n                connectionPoint\n                    .clone()\n                    .offset(0, deltaCoordinates.dy - parentRootSize.height / 2)\n            ]\n        },\n\n        getRelativeVerticesAvoidingSiblings: function(parentRootSize, deltaCoordinates, siblings) {\n\n            const x = deltaCoordinates.dx - this.rootSize.width / 4\n            let y = deltaCoordinates.dy\n            y -= Math.max(siblings.height, this.rootSize.height) / 2\n            y -= this.getMinimalGap(siblings) / 2\n\n            return [\n                g.point(0, y),\n                g.point(x, y)\n            ]\n        }\n    })\n\n    var TopLeftLayoutArea = LayoutArea.extend({\n\n        direction: 'TL',\n        oppositeDirection: 'R',\n        deltaCoordinate: 'dy',\n        marginDimension: 'height',\n\n        getConnectionPoint: function(rootSize) {\n\n            return g.point(0, rootSize.height / 2)\n        },\n\n        getCY: function() {\n\n            return (this.height - this.rootSize.height) + this.prevSiblingGap\n        },\n\n        moveRootBehindSiblings: function(siblings, rootSize) {\n\n            this.dx -= Math.max(\n                this.getRWidth(siblings, rootSize),\n                this.getTBOverlap(siblings, rootSize)\n            )\n\n            this.dy -= this.getBHeight(siblings)\n            if (this.hasHorizontalSiblings(siblings)) {\n                this.dy -= (this.getLRHeight() - rootSize.height) / 2\n            }\n        },\n\n        moveRootFromParent: function() {\n\n            const {parentArea} = this\n            if (parentArea) {\n                this.dy -= parentArea.firstChildGap\n            }\n            this.dx -= this.rootSize.width / 2 + this.rootOffset + this.parentGap\n        },\n\n        getRelativeVertices: function(parentRootSize, deltaCoordinates) {\n\n            const connectionPoint = this.getConnectionPoint(parentRootSize)\n\n            return [\n                connectionPoint\n                    .clone()\n                    .offset(0, deltaCoordinates.dy - parentRootSize.height / 2)\n            ]\n        },\n\n        getRelativeVerticesAvoidingSiblings: function(parentRootSize, deltaCoordinates, siblings) {\n\n            const x = deltaCoordinates.dx + this.rootSize.width / 4\n            let y = deltaCoordinates.dy\n            y -= Math.max(siblings.height, this.rootSize.height) / 2\n            y -= this.getMinimalGap(siblings) / 2\n\n            return [\n                g.point(0, y),\n                g.point(x, y)\n            ]\n        }\n    })\n\n    const directionRules = {\n\n        rotate: function(rule) {\n            const directions = 'LRBT'\n            const directionChange = directions.indexOf(rule[0]) - directions.indexOf(rule[1])\n            return function(direction) {\n                const directionIndex = directions.indexOf(direction)\n                return (directionIndex >= 0)\n                    ? directions[(4 + directionIndex - directionChange) % 4]\n                    : direction\n            }\n        },\n\n        flip: function(rule) {\n            const from = rule[0]\n            const to = rule[1]\n            return function(direction) {\n                if (direction === from) return to\n                if (direction === to) return from\n                return direction\n            }\n        },\n\n        straighten: function(rule) {\n            return function() {\n                return rule[1]\n            }\n        }\n\n    }\n\n    const TreeLayout = Backbone.Model.extend({\n\n        defaults: {\n\n            // A graph to perform the layout on.\n            graph: undefined,\n\n            // Global gap. Could be overriden via parentGap, siblingGap and childrenGap\n            gap: 20,\n\n            // Gap between a child and its parent.\n            parentGap: 20,\n\n            // Gap between two siblings.\n            siblingGap: 20,\n\n            // Gap between parent and its first children\n            // Applicable for BR,BL,TR,TL\n            firstChildGap: 20,\n\n            // Default direction used when elements\n            // doesn't explicitelly specify their direction.\n            direction: 'R',\n\n            // A rule telling how to reorganize a branch after reconnect.\n            // The root of the branch can change the `direction` so\n            // it migth be desirable to change also the directions of\n            // its descendants.\n            directionRule: directionRules.straighten,\n\n            // Allows elements to be positioned in animated manner.\n            //\n            // element.transition('position', position, {\n            //   delay: 300,\n            //   valueFunction: joint.util.interpolate.object,\n            // });\n            updatePosition: function(element, position, opt) {\n                element.set('position', position, opt)\n            },\n\n            // Allows vertices to be positioned in animated manner.\n            // Please see `updatePosition` option.\n            updateVertices: function(link, vertices, opt) {\n                link.set('vertices', vertices, opt)\n            },\n\n            // Allows setting arbitrary (usually layout-related) attributes\n            // on the cells as part of the layout.\n            //\n            // function(layoutArea, root, rootLink, opt) {\n            //   /* update root and rootLink cells. */\n            // }\n            updateAttributes: null,\n\n            // Arbitrary subtree can be skipped in the layout computation.\n            // e.g. a collapse branch is not visible in the paper but present\n            // in the graph.\n            //\n            // function(children, parent, opt) {\n            //   /* returns filtered children */\n            // }\n            filter: null,\n\n            // The element attributes that control layout\n            // can be customized here.\n            // e.g { direction: 'rankDir' }\n            attributeNames: {\n                // siblingRank: 'siblingRank',\n                // direction: 'direction',\n                // margin: 'margin',\n                // offset: 'offset'\n                // prevSiblingGap: 'prevSibilingGap'\n                // nextSiblingGap: 'prevSibilingGap',\n                // firstChildGap: 'firstChildGap'\n            }\n        },\n\n        initialize: function() {\n\n            // Caching the graph and the other options for a quicker access.\n            this._cacheOptions(this.attributes)\n\n            // Layout areas cache.\n            this.layoutAreas = {}\n        },\n\n        // Auto layout the entire graph\n        // Each root is treated separately.\n        layout: function(opt) {\n\n            // delete the previous layout areas\n            this.layoutAreas = {}\n\n            const graphSources = this.getGraphSources(opt)\n            for (let i = 0, n = graphSources.length; i < n; i++) {\n                this.layoutTree(graphSources[i], opt)\n            }\n\n            // COMPAT: backwards compatibility\n            this.trigger('layout:done', opt)\n\n            return this\n        },\n\n        // Auto layout a single tree.\n        layoutTree: function(root, opt) {\n\n            opt = opt || {}\n            opt.treeLayout = true\n\n            // create layout areas and compute relative positions\n            const rootArea = this._computeLayoutAreas(root, null, opt)\n\n            this._computeAbsolutePositions(rootArea)\n            this._updateCells(rootArea, opt)\n\n            return this\n        },\n\n        getLayoutArea: function(element) {\n\n            return this.layoutAreas[element.id || element] || null\n        },\n\n        getRootLayoutAreas: function() {\n\n            return this.getGraphSources().map(this.getLayoutArea, this)\n        },\n\n        // Returns filtered source elements from the graph\n        getGraphSources: function(opt) {\n\n            let sources = this.graph.getSources()\n            if (this.filter && sources.length > 0) {\n                sources = this.filter(sources, null, opt) || sources\n            }\n\n            return sources\n        },\n\n        // Returns a layout area with minimal size containing the given point.\n        getMinimalRootAreaByPoint: function(point) {\n\n            const rootLayoutAreas = this.getRootLayoutAreas().filter(function(layoutArea) {\n                return layoutArea.containsPoint(point)\n            })\n\n            if (joint.util.isEmpty(rootLayoutAreas)) {\n                return null\n            }\n\n            return rootLayoutAreas.reduce(function(res, layoutArea) {\n                if (layoutArea.width * layoutArea.height < res.min) {\n                    res.min = layoutArea.width * layoutArea.height\n                    res.item = layoutArea\n                }\n                return res\n            }, { min: Infinity, item: undefined }).item\n        },\n\n        // Recursively (in top-down fashion) computes the layout areas\n        // for every single element in the current tree.\n        _computeLayoutAreas: function(element, prevLayoutArea, opt) {\n\n            // PHASE 1: Going from the root down to the leaves.\n            const prevDirection = (prevLayoutArea) ? prevLayoutArea.direction : this.get('direction')\n            const direction = element.get(this.getAttributeName('direction')) || prevDirection\n            const layoutArea = LayoutArea.create(direction, element, this.attributes)\n            // Link to parent layout area\n            layoutArea.parentArea = prevLayoutArea\n            // Find the element inbound link.\n            layoutArea.link = this.graph.getConnectedLinks(element, { inbound: true })[0]\n            // Recursion start.\n            const children = this._getChildren(element, opt)\n            // Store the layout area on the tree layout instance.\n            this.layoutAreas[element.id] = layoutArea\n            const childLayoutAreas = []\n            for (let i = 0, n = children.length; i < n; i++) {\n                childLayoutAreas.push(this._computeLayoutAreas(children[i], layoutArea, opt))\n            }\n\n            // PHASE 2: Going from the leaves up to the root.\n            layoutArea.compute(childLayoutAreas)\n\n            return layoutArea\n        },\n\n        // Cache options on the instance object for quicker access.\n        _cacheOptions: function(options) {\n\n            const functionNames = [\n                'updateAttributes',\n                'updateVertices',\n                'updatePosition',\n                'filter'\n            ]\n\n            // cache functions\n            functionNames.forEach(function(name) {\n                this[name] = joint.util.isFunction(options[name]) ? options[name] : null\n            }, this)\n\n            // cache graph\n            this.graph = options.graph\n        },\n\n        // Returns filtered children for the given parent.\n        _getChildren: function(parent, opt) {\n\n            if (this.layoutAreas[parent.id]) {\n                // prevent infinite loop in case there are cycles in the graph\n                return []\n            }\n\n            let children = this.graph.getNeighbors(parent, { outbound: true })\n            if (this.filter && children.length > 0) {\n                children = this.filter(children, parent, opt) || children\n            }\n\n            return children\n        },\n\n        // Recursively computes the elements absolute positions based on\n        // the relative position and absolute position of the parent element.\n        _computeAbsolutePositions: function(layoutArea) {\n\n            layoutArea.computeAbsolutePosition(layoutArea)\n            for (let i = 0, n = layoutArea.childAreas.length; i < n; i++) {\n                this._computeAbsolutePositions(layoutArea.childAreas[i])\n            }\n        },\n\n        // Applies computed values on the tree cells.\n        _updateCells: function(layoutArea, opt) {\n\n            const rootElement = layoutArea.root\n            const rootLink = layoutArea.link || null\n\n            if (rootLink) {\n\n                // update the position of the current root.\n                if (this.updatePosition) {\n                    this.updatePosition(rootElement, layoutArea.getRootPosition(), opt)\n                }\n\n                // update the vertices of the link connected to the current root.\n                if (this.updateVertices) {\n                    this.updateVertices(rootLink, layoutArea.getRootVertices(), opt)\n                }\n            }\n\n            this.changeSiblingRank(rootElement, layoutArea.siblingRank, opt)\n\n            // update the attributes of the current root and the associated link\n            if (this.updateAttributes) {\n                this.updateAttributes(layoutArea, rootElement, rootLink, opt)\n            }\n\n            for (let i = 0, n = layoutArea.childAreas.length; i < n; i++) {\n                this._updateCells(layoutArea.childAreas[i], opt)\n            }\n        },\n\n        updateDirections: function(root, rule, opt) {\n\n            opt = opt || {}\n\n            const directionAttribute = this.getAttributeName('direction')\n            const getDirection = this.get('directionRule')(rule)\n\n            this.graph.search(root, function(element, level) {\n\n                if (level === 0) return\n                const newDirection = getDirection(element.get(directionAttribute))\n                this.changeDirection(element, newDirection, opt)\n\n            }.bind(this), { outbound: true })\n        },\n\n        reconnectElement: function(element, targetElement, opt) {\n\n            opt = opt || {}\n\n            const layoutArea = this.getLayoutArea(element)\n            const {link} = layoutArea\n\n            if (link) {\n\n                link.set('source', { id: targetElement.id || targetElement }, opt)\n\n                const oldDirection = layoutArea.direction\n                const newDirection = opt.direction || oldDirection\n                const newSiblingRank = opt.siblingRank || undefined\n\n                this.changeSiblingRank(element, newSiblingRank, opt)\n                this.changeDirection(element, newDirection, opt)\n\n                if (oldDirection !== newDirection) {\n                    this.updateDirections(element, [oldDirection, opt.direction], opt)\n                }\n\n                return true\n            }\n\n            return false\n        },\n\n        // A convenient way how to get/set cells attributes\n        // as the attribute names can vary based on the tree layout settings.\n\n        changeSiblingRank: function(element, siblingRank, opt) {\n\n            element.set(this.getAttributeName('siblingRank'), siblingRank, opt)\n        },\n\n        changeDirection: function(element, direction, opt) {\n\n            element.set(this.getAttributeName('direction'), direction, opt)\n        },\n\n        getAttributeName: function(attribute) {\n\n            return this.get('attributeNames')[attribute] || attribute\n        },\n\n        getAttribute: function(element, attribute) {\n\n            return element.get(this.getAttributeName(attribute))\n        },\n\n        // COMPAT: backwards compatibilty\n\n        prepare: function() {\n\n            // This method built the adjacency table originally.\n            // No need for this now as the graph build one internally.\n            return this\n        }\n\n    }, {\n\n        directionRules: directionRules\n\n    })\n\n    // Export\n    joint.layout.TreeLayout = TreeLayout\n\n})(joint, Backbone, g)\n\njoint.format.gexf = {}\n\njoint.format.gexf.toCellsArray = function(xmlString, makeElement, makeLink) {\n\n    // Parse the `xmlString` into a DOM tree.\n    const parser = new DOMParser()\n    const dom = parser.parseFromString(xmlString, 'text/xml')\n    if (dom.documentElement.nodeName == 'parsererror') {\n        throw new Error('Error while parsing GEXF file.')\n    }\n\n    // Get all nodes and edges.\n    const nodes = Array.from(dom.documentElement.querySelectorAll('node'))\n    const edges = Array.from(dom.documentElement.querySelectorAll('edge'))\n\n    // Return value.\n    const cells = []\n\n    nodes.forEach(function(node) {\n\n        const size = parseFloat(node.querySelector('size').getAttribute('value'))\n\n        const element = makeElement({\n            id: node.getAttribute('id'),\n            width: size,\n            height: size,\n            label: node.getAttribute('label')\n        })\n\n        cells.push(element)\n    })\n\n    edges.forEach(function(edge) {\n\n        const link = makeLink({ source: edge.getAttribute('source'), target: edge.getAttribute('target') })\n        cells.unshift(link)\n    })\n\n    return cells\n};\n\n(function(joint, V, $, util) {\n\n    joint.dia.Paper.prototype.toSVG = function(callback, opt) {\n\n        opt = opt || {}\n\n        this.trigger('beforeexport', opt)\n\n        // We'll be modifying `style` attribute of elements/nodes. Therefore,\n        // we're making a deep clone of the whole SVG document.\n        const exportSVG = V(this.svg).clone()\n        const exportViewport = exportSVG.findOne(`.${  util.addClassNamePrefix('viewport')}`)\n        const viewportBBox = opt.area || this.paperToLocalRect(this.getContentBBox())\n        // Make the SVG dimensions as small as the viewport.\n        // Note that those are set in the `viewBox` attribute rather then in the\n        // `width`/`height` attributes. This allows for fitting the svg element inside containers.\n        const dimensions = opt.preserveDimensions\n        if (dimensions) {\n            exportSVG.attr({\n                width: dimensions.width || viewportBBox.width,\n                height: dimensions.height || viewportBBox.height\n            })\n        }\n        // We're removing css styles from the svg container. (i.e backround-image)\n        // Set SVG viewBox starting at top-leftmost element's position (viewportBbox.x|y).\n        // We're doing this because we want to trim the `whitespace` areas of the SVG making its size\n        // as small as necessary.\n        exportSVG.removeAttr('style').attr('viewBox', [\n            viewportBBox.x,\n            viewportBBox.y,\n            viewportBBox.width,\n            viewportBBox.height\n        ].join(' '))\n        // Remove the viewport transformation.\n        // We do not want the resulting SVG to be scaled or translated.\n        exportViewport.removeAttr('transform')\n\n        if (opt.useComputedStyles !== false) {\n            // Default branch (for backwards compatibility)\n            copyExternalStyles(this.svg, exportSVG.node)\n        }\n\n        const {stylesheet} = opt\n        if (util.isString(stylesheet)) {\n            // e.g [\n            //     '.connection { fill: none }',\n            //     '.connection-wrap, .marker-vertices, .marker-arrowheads, .link-tools { display: none }'\n            // ].join('');\n            addExternalStyles(exportSVG.node, stylesheet)\n        }\n\n\n        this.trigger('afterexport', opt)\n\n        if (opt.convertImagesToDataUris) {\n\n            const exportImages = exportSVG.find('image')\n            const deffereds = exportImages.map(convertImage)\n            $.when.apply($, deffereds).then(function() {\n                callback(serialize(exportSVG.node))\n            })\n\n        } else {\n            // Now, when our `exportSVG` is ready, serialize it to a string and return it.\n            callback(serialize(exportSVG.node))\n        }\n    }\n\n    function convertImage(image) {\n\n        const deffered = $.Deferred()\n        // Firefox uses `href`, all the others 'xlink:href'\n        const url = image.attr('xlink:href') || image.attr('href')\n        util.imageToDataUri(url, function(err, dataUri) {\n            if (!err && dataUri) {\n                image.attr('xlink:href', dataUri)\n            }\n            deffered.resolve()\n        })\n\n        return deffered.promise()\n    }\n\n    function serialize(node) {\n        // fix for invalid XML entities (no-break spaces) in Safari\n        return (new XMLSerializer()).serializeToString(node).replace(/&nbsp;/g, '\\u00A0')\n    }\n\n    function addExternalStyles(toNode, styles) {\n        const doc = toNode.ownerDocument\n        const xml = doc.implementation.createDocument(null, 'xml', null)\n        V(toNode).prepend(V('style', { type: 'text/css' }, [\n            xml.createCDATASection(styles)\n        ]))\n    }\n\n    function copyExternalStyles(fromNode, toNode) {\n\n        const fromElements = Array.from(fromNode.querySelectorAll('*'))\n        const toElements = Array.from(toNode.querySelectorAll('*'))\n\n        // Now the fun part. The code below has one purpuse and i.e. store all the CSS declarations\n        // from external stylesheets to the `style` attribute of the SVG document nodes.\n        // This is achieved in three steps.\n\n        // 1. Disabling all the stylesheets in the page and therefore collecting only default style values.\n        //    This, together with the step 2, makes it possible to discard default CSS property values\n        //    and store only those that differ.\n        // 2. Enabling back all the stylesheets in the page and collecting styles that differ from the default values.\n        // 3. Applying the difference between default values and the ones set by custom stylesheets\n        //    onto the `style` attribute of each of the nodes in SVG.\n\n        // Note that all of this would be much more simplified if `window.getMatchedCSSRules()` worked\n        // in all the supported browsers. Pity is that it doesn't even work in WebKit that\n        // has it (https://bugzilla.mozilla.org/show_bug.cgi?id=438278).\n        // Pollyfil for Firefox can be https://gist.github.com/ydaniv/3033012;\n\n        const doc = fromNode.ownerDocument\n        const styleSheetsCount = doc.styleSheets.length\n        const styleSheetsCopy = []\n\n        // 1.\n        for (let i = styleSheetsCount - 1; i >= 0; i--) {\n\n            // There is a bug (bugSS) in Chrome 14 and Safari. When you set stylesheet.disable = true it will\n            // also remove it from document.styleSheets. So we need to store all stylesheets before\n            // we disable them. Later on we put them back to document.styleSheets if needed.\n            // See the bug `https://code.google.com/p/chromium/issues/detail?id=88310`.\n            styleSheetsCopy[i] = doc.styleSheets[i]\n            doc.styleSheets[i].disabled = true\n        }\n\n        const defaultComputedStyles = {}\n\n        fromElements.forEach(function(el, idx) {\n\n            const computedStyle = window.getComputedStyle(el, null)\n            // We're making a deep copy of the `computedStyle` so that it's not affected\n            // by that next step when all the stylesheets are re-enabled again.\n            const defaultComputedStyle = {}\n            joint.util.forIn(computedStyle, function(property) {\n                defaultComputedStyle[property] = computedStyle.getPropertyValue(property)\n            })\n\n            defaultComputedStyles[idx] = defaultComputedStyle\n        })\n\n\n        // bugSS: Check whether the stylesheets have been removed from document.styleSheets\n        if (styleSheetsCount != doc.styleSheets.length) {\n            // bugSS: Copy all stylesheets back\n            styleSheetsCopy.forEach(function(copy, i) {\n                doc.styleSheets[i] = copy\n            })\n        }\n\n        // 2.\n        // bugSS: Note that if stylesheet bug happen the document.styleSheets.length is still 0.\n        for (let j = 0; j < styleSheetsCount; j++) {\n            doc.styleSheets[j].disabled = false\n        }\n        // bugSS: Now is document.styleSheets.length = number of stylesheets again.\n\n        const customStyles = {}\n\n        fromElements.forEach(function(el, idx) {\n\n            const computedStyle = window.getComputedStyle(el, null)\n            const defaultComputedStyle = defaultComputedStyles[idx]\n            const customStyle = {}\n\n            joint.util.forIn(computedStyle, function(property) {\n                // Ignore string indexes e.g. \"15\"\n                if (!isNaN(property)) return\n                // Store only those that differ from the default styles applied by the browser.\n                // TODO: Problem will arise with browser specific properties (browser prefixed ones).\n                if (computedStyle.getPropertyValue(property) !== defaultComputedStyle[property]) {\n                    customStyle[property] = computedStyle.getPropertyValue(property)\n                }\n            })\n\n            customStyles[idx] = customStyle\n        })\n\n        // 3.\n        toElements.forEach(function(el, idx) {\n            $(el).css(customStyles[idx])\n        })\n    }\n\n    // Just a little helper for quick-opening the paper as data-uri SVG in a new browser window.\n    joint.dia.Paper.prototype.openAsSVG = function(opt) {\n\n        const windowFeatures = 'menubar=yes,location=yes,resizable=yes,scrollbars=yes,status=yes'\n        const windowName = util.uniqueId('svg_output')\n\n        this.toSVG(function(svg) {\n\n            const imageWindow = window.open('', windowName, windowFeatures)\n            const dataImageUri = `data:image/svg+xml,${  encodeURIComponent(svg)}`\n            imageWindow.document.write(`<img src=\"${  dataImageUri  }\" style=\"max-height:100%\" />`)\n\n        }, util.assign({ convertImagesToDataUris: true }, opt))\n    }\n\n})(joint, V, $, joint.util);\n\n/*\n\nStackBlur - a fast almost Gaussian Blur For Canvas\n\nVersion: \t0.5\nAuthor:\t\tMario Klingemann\nContact: \tmario@quasimondo.com\nWebsite:\thttp://www.quasimondo.com/StackBlurForCanvas\nTwitter:\t@quasimondo\n\nIn case you find this class useful - especially in commercial projects -\nI am not totally unhappy for a small donation to my PayPal account\nmario@quasimondo.de\n\nOr support me on flattr: \nhttps://flattr.com/thing/72791/StackBlur-a-fast-almost-Gaussian-Blur-Effect-for-CanvasJavascript\n\nCopyright (c) 2010 Mario Klingemann\n\nPermission is hereby granted, free of charge, to any person\nobtaining a copy of this software and associated documentation\nfiles (the \"Software\"), to deal in the Software without\nrestriction, including without limitation the rights to use,\ncopy, modify, merge, publish, distribute, sublicense, and/or sell\ncopies of the Software, and to permit persons to whom the\nSoftware is furnished to do so, subject to the following\nconditions:\n\nThe above copyright notice and this permission notice shall be\nincluded in all copies or substantial portions of the Software.\n\nTHE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND,\nEXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES\nOF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND\nNONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT\nHOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,\nWHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\nFROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR\nOTHER DEALINGS IN THE SOFTWARE.\n*/\n\n(function ( global ) {\n\n\tconst mul_table = [\n\t\t\t512,512,456,512,328,456,335,512,405,328,271,456,388,335,292,512,\n\t\t\t454,405,364,328,298,271,496,456,420,388,360,335,312,292,273,512,\n\t\t\t482,454,428,405,383,364,345,328,312,298,284,271,259,496,475,456,\n\t\t\t437,420,404,388,374,360,347,335,323,312,302,292,282,273,265,512,\n\t\t\t497,482,468,454,441,428,417,405,394,383,373,364,354,345,337,328,\n\t\t\t320,312,305,298,291,284,278,271,265,259,507,496,485,475,465,456,\n\t\t\t446,437,428,420,412,404,396,388,381,374,367,360,354,347,341,335,\n\t\t\t329,323,318,312,307,302,297,292,287,282,278,273,269,265,261,512,\n\t\t\t505,497,489,482,475,468,461,454,447,441,435,428,422,417,411,405,\n\t\t\t399,394,389,383,378,373,368,364,359,354,350,345,341,337,332,328,\n\t\t\t324,320,316,312,309,305,301,298,294,291,287,284,281,278,274,271,\n\t\t\t268,265,262,259,257,507,501,496,491,485,480,475,470,465,460,456,\n\t\t\t451,446,442,437,433,428,424,420,416,412,408,404,400,396,392,388,\n\t\t\t385,381,377,374,370,367,363,360,357,354,350,347,344,341,338,335,\n\t\t\t332,329,326,323,320,318,315,312,310,307,304,302,299,297,294,292,\n\t\t\t289,287,285,282,280,278,275,273,271,269,267,265,263,261,259]\n\t\t\t\n\t   \n\tconst shg_table = [\n\t\t\t 9, 11, 12, 13, 13, 14, 14, 15, 15, 15, 15, 16, 16, 16, 16, 17, \n\t\t\t17, 17, 17, 17, 17, 17, 18, 18, 18, 18, 18, 18, 18, 18, 18, 19, \n\t\t\t19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 20, 20, 20,\n\t\t\t20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 21,\n\t\t\t21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21,\n\t\t\t21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 22, 22, 22, 22, 22, 22, \n\t\t\t22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22,\n\t\t\t22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 23, \n\t\t\t23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23,\n\t\t\t23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23,\n\t\t\t23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, \n\t\t\t23, 23, 23, 23, 23, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, \n\t\t\t24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,\n\t\t\t24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,\n\t\t\t24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,\n\t\t\t24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24 ]\n\n\tfunction premultiplyAlpha(imageData)\n\t{\n\t\tconst pixels = imageData.data\n\t\tconst size = imageData.width * imageData.height * 4\n\t\t\n\t\tfor (let i=0; i<size; i+=4)\n\t\t{\n\t\t\tconst a = pixels[i+3] / 255\n\t\t\tpixels[i  ] *= a\n\t\t\tpixels[i+1] *= a\n\t\t\tpixels[i+2] *= a\n\t\t}\n\t}\n\n\tfunction unpremultiplyAlpha(imageData)\n\t{\n\t\tconst pixels = imageData.data\n\t\tconst size = imageData.width * imageData.height * 4\n\t\t\n\t\tfor (let i=0; i<size; i+=4)\n\t\t{\n\t\t\tlet a = pixels[i+3]\n\t\t\tif (a != 0)\n\t\t\t{\n\t\t\t\ta = 255 / a\n\t\t\t\tpixels[i  ] *= a\n\t\t\t\tpixels[i+1] *= a\n\t\t\t\tpixels[i+2] *= a\n\t\t\t}\n\t\t}\n\t}\n\n\tfunction stackBlurImage( imageID, canvasID, radius, blurAlphaChannel )\n\t{\n\t\t\t\t\n\t\tconst img = document.getElementById( imageID )\n\t\tconst w = img.naturalWidth\n\t\tconst h = img.naturalHeight\n\t\t   \n\t\tconst canvas = document.getElementById( canvasID )\n\t\t  \n\t\tcanvas.style.width  = `${w  }px`\n\t\tcanvas.style.height = `${h  }px`\n\t\tcanvas.width = w\n\t\tcanvas.height = h\n\t\t\n\t\tconst context = canvas.getContext(\"2d\")\n\t\tcontext.clearRect( 0, 0, w, h )\n\t\tcontext.drawImage( img, 0, 0 )\n\n\t\tif ( isNaN(radius) || radius < 1 ) return\n\t\t\n\t\tif ( blurAlphaChannel )\n\t\t\tstackBlurCanvasRGBA( canvasID, 0, 0, w, h, radius )\n\t\telse \n\t\t\tstackBlurCanvasRGB( canvasID, 0, 0, w, h, radius )\n\t}\n\n\n\tfunction stackBlurCanvasRGBA( id, top_x, top_y, width, height, radius )\n\t{\n\t\tif ( isNaN(radius) || radius < 1 ) return\n\t\tradius |= 0\n\t\t\n\t\tconst canvas  = document.getElementById( id )\n\t\tconst context = canvas.getContext(\"2d\")\n\t\tlet imageData\n\t\t\n\t\ttry {\n\t\t  try {\n\t\t\timageData = context.getImageData( top_x, top_y, width, height )\n\t\t  } catch(e) {\n\t\t  \n\t\t\t// NOTE: this part is supposedly only needed if you want to work with local files\n\t\t\t// so it might be okay to remove the whole try/catch block and just use\n\t\t\t// imageData = context.getImageData( top_x, top_y, width, height );\n\t\t\ttry {\n\t\t\t\tnetscape.security.PrivilegeManager.enablePrivilege(\"UniversalBrowserRead\")\n\t\t\t\timageData = context.getImageData( top_x, top_y, width, height )\n\t\t\t} catch(e) {\n\t\t\t\talert(\"Cannot access local image\")\n\t\t\t\tthrow new Error(`unable to access local image data: ${  e}`)\n\t\t\t\treturn\n\t\t\t}\n\t\t  }\n\t\t} catch(e) {\n\t\t  alert(\"Cannot access image\")\n\t\t  throw new Error(`unable to access image data: ${  e}`)\n\t\t}\n\t\t\n\t\tpremultiplyAlpha(imageData)\n\t\t\n\t\tconst pixels = imageData.data\n\t\t\t\t\n\t\tlet x; let y; let i; let p; let yp; let yi; let yw; let r_sum; let g_sum; let b_sum; let a_sum \n\t\tlet r_out_sum; let g_out_sum; let b_out_sum; let a_out_sum\n\t\tlet r_in_sum; let g_in_sum; let b_in_sum; let a_in_sum \n\t\tlet pr; let pg; let pb; let pa; let rbs\n\t\t\t\t\n\t\tconst div = radius + radius + 1\n\t\tconst w4 = width << 2\n\t\tconst widthMinus1  = width - 1\n\t\tconst heightMinus1 = height - 1\n\t\tconst radiusPlus1  = radius + 1\n\t\tconst sumFactor = radiusPlus1 * ( radiusPlus1 + 1 ) / 2\n\t\t\n\t\tconst stackStart = new BlurStack()\n\t\tlet stack = stackStart\n\t\tfor ( i = 1; i < div; i++ )\n\t\t{\n\t\t\tstack = stack.next = new BlurStack()\n\t\t\tif ( i == radiusPlus1 ) var stackEnd = stack\n\t\t}\n\t\tstack.next = stackStart\n\t\tlet stackIn = null\n\t\tlet stackOut = null\n\t\t\n\t\tyw = yi = 0\n\t\t\n\t\tconst mul_sum = mul_table[radius]\n\t\tconst shg_sum = shg_table[radius]\n\t\t\n\t\tfor ( y = 0; y < height; y++ )\n\t\t{\n\t\t\tr_in_sum = g_in_sum = b_in_sum = a_in_sum = r_sum = g_sum = b_sum = a_sum = 0\n\t\t\t\n\t\t\tr_out_sum = radiusPlus1 * ( pr = pixels[yi] )\n\t\t\tg_out_sum = radiusPlus1 * ( pg = pixels[yi+1] )\n\t\t\tb_out_sum = radiusPlus1 * ( pb = pixels[yi+2] )\n\t\t\ta_out_sum = radiusPlus1 * ( pa = pixels[yi+3] )\n\t\t\t\n\t\t\tr_sum += sumFactor * pr\n\t\t\tg_sum += sumFactor * pg\n\t\t\tb_sum += sumFactor * pb\n\t\t\ta_sum += sumFactor * pa\n\t\t\t\n\t\t\tstack = stackStart\n\t\t\t\n\t\t\tfor( i = 0; i < radiusPlus1; i++ )\n\t\t\t{\n\t\t\t\tstack.r = pr\n\t\t\t\tstack.g = pg\n\t\t\t\tstack.b = pb\n\t\t\t\tstack.a = pa\n\t\t\t\tstack = stack.next\n\t\t\t}\n\t\t\t\n\t\t\tfor( i = 1; i < radiusPlus1; i++ )\n\t\t\t{\n\t\t\t\tp = yi + (( widthMinus1 < i ? widthMinus1 : i ) << 2 )\n\t\t\t\tr_sum += ( stack.r = ( pr = pixels[p])) * ( rbs = radiusPlus1 - i )\n\t\t\t\tg_sum += ( stack.g = ( pg = pixels[p+1])) * rbs\n\t\t\t\tb_sum += ( stack.b = ( pb = pixels[p+2])) * rbs\n\t\t\t\ta_sum += ( stack.a = ( pa = pixels[p+3])) * rbs\n\t\t\t\t\n\t\t\t\tr_in_sum += pr\n\t\t\t\tg_in_sum += pg\n\t\t\t\tb_in_sum += pb\n\t\t\t\ta_in_sum += pa\n\t\t\t\t\n\t\t\t\tstack = stack.next\n\t\t\t}\n\t\t\t\n\t\t\tstackIn = stackStart\n\t\t\tstackOut = stackEnd\n\t\t\tfor ( x = 0; x < width; x++ )\n\t\t\t{\n\t\t\t\tpixels[yi]   = (r_sum * mul_sum) >> shg_sum\n\t\t\t\tpixels[yi+1] = (g_sum * mul_sum) >> shg_sum\n\t\t\t\tpixels[yi+2] = (b_sum * mul_sum) >> shg_sum\n\t\t\t\tpixels[yi+3] = (a_sum * mul_sum) >> shg_sum\n\t\t\t\t\n\t\t\t\tr_sum -= r_out_sum\n\t\t\t\tg_sum -= g_out_sum\n\t\t\t\tb_sum -= b_out_sum\n\t\t\t\ta_sum -= a_out_sum\n\t\t\t\t\n\t\t\t\tr_out_sum -= stackIn.r\n\t\t\t\tg_out_sum -= stackIn.g\n\t\t\t\tb_out_sum -= stackIn.b\n\t\t\t\ta_out_sum -= stackIn.a\n\t\t\t\t\n\t\t\t\tp =  ( yw + ( ( p = x + radius + 1 ) < widthMinus1 ? p : widthMinus1 ) ) << 2\n\t\t\t\t\n\t\t\t\tr_in_sum += ( stackIn.r = pixels[p])\n\t\t\t\tg_in_sum += ( stackIn.g = pixels[p+1])\n\t\t\t\tb_in_sum += ( stackIn.b = pixels[p+2])\n\t\t\t\ta_in_sum += ( stackIn.a = pixels[p+3])\n\t\t\t\t\n\t\t\t\tr_sum += r_in_sum\n\t\t\t\tg_sum += g_in_sum\n\t\t\t\tb_sum += b_in_sum\n\t\t\t\ta_sum += a_in_sum\n\t\t\t\t\n\t\t\t\tstackIn = stackIn.next\n\t\t\t\t\n\t\t\t\tr_out_sum += ( pr = stackOut.r )\n\t\t\t\tg_out_sum += ( pg = stackOut.g )\n\t\t\t\tb_out_sum += ( pb = stackOut.b )\n\t\t\t\ta_out_sum += ( pa = stackOut.a )\n\t\t\t\t\n\t\t\t\tr_in_sum -= pr\n\t\t\t\tg_in_sum -= pg\n\t\t\t\tb_in_sum -= pb\n\t\t\t\ta_in_sum -= pa\n\t\t\t\t\n\t\t\t\tstackOut = stackOut.next\n\n\t\t\t\tyi += 4\n\t\t\t}\n\t\t\tyw += width\n\t\t}\n\n\t\t\n\t\tfor ( x = 0; x < width; x++ )\n\t\t{\n\t\t\tg_in_sum = b_in_sum = a_in_sum = r_in_sum = g_sum = b_sum = a_sum = r_sum = 0\n\t\t\t\n\t\t\tyi = x << 2\n\t\t\tr_out_sum = radiusPlus1 * ( pr = pixels[yi])\n\t\t\tg_out_sum = radiusPlus1 * ( pg = pixels[yi+1])\n\t\t\tb_out_sum = radiusPlus1 * ( pb = pixels[yi+2])\n\t\t\ta_out_sum = radiusPlus1 * ( pa = pixels[yi+3])\n\t\t\t\n\t\t\tr_sum += sumFactor * pr\n\t\t\tg_sum += sumFactor * pg\n\t\t\tb_sum += sumFactor * pb\n\t\t\ta_sum += sumFactor * pa\n\t\t\t\n\t\t\tstack = stackStart\n\t\t\t\n\t\t\tfor( i = 0; i < radiusPlus1; i++ )\n\t\t\t{\n\t\t\t\tstack.r = pr\n\t\t\t\tstack.g = pg\n\t\t\t\tstack.b = pb\n\t\t\t\tstack.a = pa\n\t\t\t\tstack = stack.next\n\t\t\t}\n\t\t\t\n\t\t\typ = width\n\t\t\t\n\t\t\tfor( i = 1; i <= radius; i++ )\n\t\t\t{\n\t\t\t\tyi = ( yp + x ) << 2\n\t\t\t\t\n\t\t\t\tr_sum += ( stack.r = ( pr = pixels[yi])) * ( rbs = radiusPlus1 - i )\n\t\t\t\tg_sum += ( stack.g = ( pg = pixels[yi+1])) * rbs\n\t\t\t\tb_sum += ( stack.b = ( pb = pixels[yi+2])) * rbs\n\t\t\t\ta_sum += ( stack.a = ( pa = pixels[yi+3])) * rbs\n\t\t\t   \n\t\t\t\tr_in_sum += pr\n\t\t\t\tg_in_sum += pg\n\t\t\t\tb_in_sum += pb\n\t\t\t\ta_in_sum += pa\n\t\t\t\t\n\t\t\t\tstack = stack.next\n\t\t\t\n\t\t\t\tif( i < heightMinus1 )\n\t\t\t\t{\n\t\t\t\t\typ += width\n\t\t\t\t}\n\t\t\t}\n\t\t\t\n\t\t\tyi = x\n\t\t\tstackIn = stackStart\n\t\t\tstackOut = stackEnd\n\t\t\tfor ( y = 0; y < height; y++ )\n\t\t\t{\n\t\t\t\tp = yi << 2\n\t\t\t\tpixels[p]   = (r_sum * mul_sum) >> shg_sum\n\t\t\t\tpixels[p+1] = (g_sum * mul_sum) >> shg_sum\n\t\t\t\tpixels[p+2] = (b_sum * mul_sum) >> shg_sum\n\t\t\t\tpixels[p+3] = (a_sum * mul_sum) >> shg_sum\n\t\t\t\t\n\t\t\t\tr_sum -= r_out_sum\n\t\t\t\tg_sum -= g_out_sum\n\t\t\t\tb_sum -= b_out_sum\n\t\t\t\ta_sum -= a_out_sum\n\t\t\t   \n\t\t\t\tr_out_sum -= stackIn.r\n\t\t\t\tg_out_sum -= stackIn.g\n\t\t\t\tb_out_sum -= stackIn.b\n\t\t\t\ta_out_sum -= stackIn.a\n\t\t\t\t\n\t\t\t\tp = ( x + (( ( p = y + radiusPlus1) < heightMinus1 ? p : heightMinus1 ) * width )) << 2\n\t\t\t\t\n\t\t\t\tr_sum += ( r_in_sum += ( stackIn.r = pixels[p]))\n\t\t\t\tg_sum += ( g_in_sum += ( stackIn.g = pixels[p+1]))\n\t\t\t\tb_sum += ( b_in_sum += ( stackIn.b = pixels[p+2]))\n\t\t\t\ta_sum += ( a_in_sum += ( stackIn.a = pixels[p+3]))\n\t\t\t   \n\t\t\t\tstackIn = stackIn.next\n\t\t\t\t\n\t\t\t\tr_out_sum += ( pr = stackOut.r )\n\t\t\t\tg_out_sum += ( pg = stackOut.g )\n\t\t\t\tb_out_sum += ( pb = stackOut.b )\n\t\t\t\ta_out_sum += ( pa = stackOut.a )\n\t\t\t\t\n\t\t\t\tr_in_sum -= pr\n\t\t\t\tg_in_sum -= pg\n\t\t\t\tb_in_sum -= pb\n\t\t\t\ta_in_sum -= pa\n\t\t\t\t\n\t\t\t\tstackOut = stackOut.next\n\t\t\t\t\n\t\t\t\tyi += width\n\t\t\t}\n\t\t}\n\t\t\n\t\tunpremultiplyAlpha(imageData)\n\t\t\n\t\tcontext.putImageData( imageData, top_x, top_y )\n\t}\n\n\n\tfunction stackBlurCanvasRGB( id, top_x, top_y, width, height, radius )\n\t{\n\t\tif ( isNaN(radius) || radius < 1 ) return\n\t\tradius |= 0\n\t\t\n\t\tconst canvas  = document.getElementById( id )\n\t\tconst context = canvas.getContext(\"2d\")\n\t\tlet imageData\n\t\t\n\t\ttry {\n\t\t  try {\n\t\t\timageData = context.getImageData( top_x, top_y, width, height )\n\t\t  } catch(e) {\n\t\t  \n\t\t\t// NOTE: this part is supposedly only needed if you want to work with local files\n\t\t\t// so it might be okay to remove the whole try/catch block and just use\n\t\t\t// imageData = context.getImageData( top_x, top_y, width, height );\n\t\t\ttry {\n\t\t\t\tnetscape.security.PrivilegeManager.enablePrivilege(\"UniversalBrowserRead\")\n\t\t\t\timageData = context.getImageData( top_x, top_y, width, height )\n\t\t\t} catch(e) {\n\t\t\t\talert(\"Cannot access local image\")\n\t\t\t\tthrow new Error(`unable to access local image data: ${  e}`)\n\t\t\t\treturn\n\t\t\t}\n\t\t  }\n\t\t} catch(e) {\n\t\t  alert(\"Cannot access image\")\n\t\t  throw new Error(`unable to access image data: ${  e}`)\n\t\t}\n\t\t\t\t\n\t\tconst pixels = imageData.data\n\t\t\t\t\n\t\tlet x; let y; let i; let p; let yp; let yi; let yw; let r_sum; let g_sum; let b_sum\n\t\tlet r_out_sum; let g_out_sum; let b_out_sum\n\t\tlet r_in_sum; let g_in_sum; let b_in_sum\n\t\tlet pr; let pg; let pb; let rbs\n\t\t\t\t\n\t\tconst div = radius + radius + 1\n\t\tconst w4 = width << 2\n\t\tconst widthMinus1  = width - 1\n\t\tconst heightMinus1 = height - 1\n\t\tconst radiusPlus1  = radius + 1\n\t\tconst sumFactor = radiusPlus1 * ( radiusPlus1 + 1 ) / 2\n\t\t\n\t\tconst stackStart = new BlurStack()\n\t\tlet stack = stackStart\n\t\tfor ( i = 1; i < div; i++ )\n\t\t{\n\t\t\tstack = stack.next = new BlurStack()\n\t\t\tif ( i == radiusPlus1 ) var stackEnd = stack\n\t\t}\n\t\tstack.next = stackStart\n\t\tlet stackIn = null\n\t\tlet stackOut = null\n\t\t\n\t\tyw = yi = 0\n\t\t\n\t\tconst mul_sum = mul_table[radius]\n\t\tconst shg_sum = shg_table[radius]\n\t\t\n\t\tfor ( y = 0; y < height; y++ )\n\t\t{\n\t\t\tr_in_sum = g_in_sum = b_in_sum = r_sum = g_sum = b_sum = 0\n\t\t\t\n\t\t\tr_out_sum = radiusPlus1 * ( pr = pixels[yi] )\n\t\t\tg_out_sum = radiusPlus1 * ( pg = pixels[yi+1] )\n\t\t\tb_out_sum = radiusPlus1 * ( pb = pixels[yi+2] )\n\t\t\t\n\t\t\tr_sum += sumFactor * pr\n\t\t\tg_sum += sumFactor * pg\n\t\t\tb_sum += sumFactor * pb\n\t\t\t\n\t\t\tstack = stackStart\n\t\t\t\n\t\t\tfor( i = 0; i < radiusPlus1; i++ )\n\t\t\t{\n\t\t\t\tstack.r = pr\n\t\t\t\tstack.g = pg\n\t\t\t\tstack.b = pb\n\t\t\t\tstack = stack.next\n\t\t\t}\n\t\t\t\n\t\t\tfor( i = 1; i < radiusPlus1; i++ )\n\t\t\t{\n\t\t\t\tp = yi + (( widthMinus1 < i ? widthMinus1 : i ) << 2 )\n\t\t\t\tr_sum += ( stack.r = ( pr = pixels[p])) * ( rbs = radiusPlus1 - i )\n\t\t\t\tg_sum += ( stack.g = ( pg = pixels[p+1])) * rbs\n\t\t\t\tb_sum += ( stack.b = ( pb = pixels[p+2])) * rbs\n\t\t\t\t\n\t\t\t\tr_in_sum += pr\n\t\t\t\tg_in_sum += pg\n\t\t\t\tb_in_sum += pb\n\t\t\t\t\n\t\t\t\tstack = stack.next\n\t\t\t}\n\t\t\t\n\t\t\t\n\t\t\tstackIn = stackStart\n\t\t\tstackOut = stackEnd\n\t\t\tfor ( x = 0; x < width; x++ )\n\t\t\t{\n\t\t\t\tpixels[yi]   = (r_sum * mul_sum) >> shg_sum\n\t\t\t\tpixels[yi+1] = (g_sum * mul_sum) >> shg_sum\n\t\t\t\tpixels[yi+2] = (b_sum * mul_sum) >> shg_sum\n\t\t\t\t\n\t\t\t\tr_sum -= r_out_sum\n\t\t\t\tg_sum -= g_out_sum\n\t\t\t\tb_sum -= b_out_sum\n\t\t\t\t\n\t\t\t\tr_out_sum -= stackIn.r\n\t\t\t\tg_out_sum -= stackIn.g\n\t\t\t\tb_out_sum -= stackIn.b\n\t\t\t\t\n\t\t\t\tp =  ( yw + ( ( p = x + radius + 1 ) < widthMinus1 ? p : widthMinus1 ) ) << 2\n\t\t\t\t\n\t\t\t\tr_in_sum += ( stackIn.r = pixels[p])\n\t\t\t\tg_in_sum += ( stackIn.g = pixels[p+1])\n\t\t\t\tb_in_sum += ( stackIn.b = pixels[p+2])\n\t\t\t\t\n\t\t\t\tr_sum += r_in_sum\n\t\t\t\tg_sum += g_in_sum\n\t\t\t\tb_sum += b_in_sum\n\t\t\t\t\n\t\t\t\tstackIn = stackIn.next\n\t\t\t\t\n\t\t\t\tr_out_sum += ( pr = stackOut.r )\n\t\t\t\tg_out_sum += ( pg = stackOut.g )\n\t\t\t\tb_out_sum += ( pb = stackOut.b )\n\t\t\t\t\n\t\t\t\tr_in_sum -= pr\n\t\t\t\tg_in_sum -= pg\n\t\t\t\tb_in_sum -= pb\n\t\t\t\t\n\t\t\t\tstackOut = stackOut.next\n\n\t\t\t\tyi += 4\n\t\t\t}\n\t\t\tyw += width\n\t\t}\n\n\t\t\n\t\tfor ( x = 0; x < width; x++ )\n\t\t{\n\t\t\tg_in_sum = b_in_sum = r_in_sum = g_sum = b_sum = r_sum = 0\n\t\t\t\n\t\t\tyi = x << 2\n\t\t\tr_out_sum = radiusPlus1 * ( pr = pixels[yi])\n\t\t\tg_out_sum = radiusPlus1 * ( pg = pixels[yi+1])\n\t\t\tb_out_sum = radiusPlus1 * ( pb = pixels[yi+2])\n\t\t\t\n\t\t\tr_sum += sumFactor * pr\n\t\t\tg_sum += sumFactor * pg\n\t\t\tb_sum += sumFactor * pb\n\t\t\t\n\t\t\tstack = stackStart\n\t\t\t\n\t\t\tfor( i = 0; i < radiusPlus1; i++ )\n\t\t\t{\n\t\t\t\tstack.r = pr\n\t\t\t\tstack.g = pg\n\t\t\t\tstack.b = pb\n\t\t\t\tstack = stack.next\n\t\t\t}\n\t\t\t\n\t\t\typ = width\n\t\t\t\n\t\t\tfor( i = 1; i <= radius; i++ )\n\t\t\t{\n\t\t\t\tyi = ( yp + x ) << 2\n\t\t\t\t\n\t\t\t\tr_sum += ( stack.r = ( pr = pixels[yi])) * ( rbs = radiusPlus1 - i )\n\t\t\t\tg_sum += ( stack.g = ( pg = pixels[yi+1])) * rbs\n\t\t\t\tb_sum += ( stack.b = ( pb = pixels[yi+2])) * rbs\n\t\t\t\t\n\t\t\t\tr_in_sum += pr\n\t\t\t\tg_in_sum += pg\n\t\t\t\tb_in_sum += pb\n\t\t\t\t\n\t\t\t\tstack = stack.next\n\t\t\t\n\t\t\t\tif( i < heightMinus1 )\n\t\t\t\t{\n\t\t\t\t\typ += width\n\t\t\t\t}\n\t\t\t}\n\t\t\t\n\t\t\tyi = x\n\t\t\tstackIn = stackStart\n\t\t\tstackOut = stackEnd\n\t\t\tfor ( y = 0; y < height; y++ )\n\t\t\t{\n\t\t\t\tp = yi << 2\n\t\t\t\tpixels[p]   = (r_sum * mul_sum) >> shg_sum\n\t\t\t\tpixels[p+1] = (g_sum * mul_sum) >> shg_sum\n\t\t\t\tpixels[p+2] = (b_sum * mul_sum) >> shg_sum\n\t\t\t\t\n\t\t\t\tr_sum -= r_out_sum\n\t\t\t\tg_sum -= g_out_sum\n\t\t\t\tb_sum -= b_out_sum\n\t\t\t\t\n\t\t\t\tr_out_sum -= stackIn.r\n\t\t\t\tg_out_sum -= stackIn.g\n\t\t\t\tb_out_sum -= stackIn.b\n\t\t\t\t\n\t\t\t\tp = ( x + (( ( p = y + radiusPlus1) < heightMinus1 ? p : heightMinus1 ) * width )) << 2\n\t\t\t\t\n\t\t\t\tr_sum += ( r_in_sum += ( stackIn.r = pixels[p]))\n\t\t\t\tg_sum += ( g_in_sum += ( stackIn.g = pixels[p+1]))\n\t\t\t\tb_sum += ( b_in_sum += ( stackIn.b = pixels[p+2]))\n\t\t\t\t\n\t\t\t\tstackIn = stackIn.next\n\t\t\t\t\n\t\t\t\tr_out_sum += ( pr = stackOut.r )\n\t\t\t\tg_out_sum += ( pg = stackOut.g )\n\t\t\t\tb_out_sum += ( pb = stackOut.b )\n\t\t\t\t\n\t\t\t\tr_in_sum -= pr\n\t\t\t\tg_in_sum -= pg\n\t\t\t\tb_in_sum -= pb\n\t\t\t\t\n\t\t\t\tstackOut = stackOut.next\n\t\t\t\t\n\t\t\t\tyi += width\n\t\t\t}\n\t\t}\n\t\t\n\t\tcontext.putImageData( imageData, top_x, top_y )\n\t\t\n\t}\n\n\tfunction BlurStack()\n\t{\n\t\tthis.r = 0\n\t\tthis.g = 0\n\t\tthis.b = 0\n\t\tthis.a = 0\n\t\tthis.next = null\n\t}\n\n\tconst stackBlur = {\n\t\timage: stackBlurImage,\n\t\tcanvasRGBA: stackBlurCanvasRGBA,\n\t\tcanvasRGB: stackBlurCanvasRGB\n\t}\n\n\t// export as AMD...\n\tif ( typeof define !== 'undefined' && define.amd ) {\n\t    define( function () { return stackBlur })\n\t}\n\n\t// ...or as browserify\n\telse if ( typeof module !== 'undefined' && module.exports ) {\n\t    module.exports = stackBlur\n\t}\n\n\tglobal.stackBlur = stackBlur\n\n}( typeof window !== 'undefined' ? window : this ));\n/**\n * A class to parse color values\n * @author Stoyan Stefanov <sstoo@gmail.com>\n * @link   http://www.phpied.com/rgb-color-parser-in-javascript/\n * @license Use it if you like it\n */\n \n(function ( global ) {\n \n\tfunction RGBColor(color_string)\n\t{\n\t\tthis.ok = false\n\n\t\t// strip any leading #\n\t\tif (color_string.charAt(0) == '#') { // remove # if any\n\t\t\tcolor_string = color_string.substr(1,6)\n\t\t}\n\n\t\tcolor_string = color_string.replace(/ /g,'')\n\t\tcolor_string = color_string.toLowerCase()\n\n\t\t// before getting into regexps, try simple matches\n\t\t// and overwrite the input\n\t\tconst simple_colors = {\n\t\t\taliceblue: 'f0f8ff',\n\t\t\tantiquewhite: 'faebd7',\n\t\t\taqua: '00ffff',\n\t\t\taquamarine: '7fffd4',\n\t\t\tazure: 'f0ffff',\n\t\t\tbeige: 'f5f5dc',\n\t\t\tbisque: 'ffe4c4',\n\t\t\tblack: '000000',\n\t\t\tblanchedalmond: 'ffebcd',\n\t\t\tblue: '0000ff',\n\t\t\tblueviolet: '8a2be2',\n\t\t\tbrown: 'a52a2a',\n\t\t\tburlywood: 'deb887',\n\t\t\tcadetblue: '5f9ea0',\n\t\t\tchartreuse: '7fff00',\n\t\t\tchocolate: 'd2691e',\n\t\t\tcoral: 'ff7f50',\n\t\t\tcornflowerblue: '6495ed',\n\t\t\tcornsilk: 'fff8dc',\n\t\t\tcrimson: 'dc143c',\n\t\t\tcyan: '00ffff',\n\t\t\tdarkblue: '00008b',\n\t\t\tdarkcyan: '008b8b',\n\t\t\tdarkgoldenrod: 'b8860b',\n\t\t\tdarkgray: 'a9a9a9',\n\t\t\tdarkgreen: '006400',\n\t\t\tdarkkhaki: 'bdb76b',\n\t\t\tdarkmagenta: '8b008b',\n\t\t\tdarkolivegreen: '556b2f',\n\t\t\tdarkorange: 'ff8c00',\n\t\t\tdarkorchid: '9932cc',\n\t\t\tdarkred: '8b0000',\n\t\t\tdarksalmon: 'e9967a',\n\t\t\tdarkseagreen: '8fbc8f',\n\t\t\tdarkslateblue: '483d8b',\n\t\t\tdarkslategray: '2f4f4f',\n\t\t\tdarkturquoise: '00ced1',\n\t\t\tdarkviolet: '9400d3',\n\t\t\tdeeppink: 'ff1493',\n\t\t\tdeepskyblue: '00bfff',\n\t\t\tdimgray: '696969',\n\t\t\tdodgerblue: '1e90ff',\n\t\t\tfeldspar: 'd19275',\n\t\t\tfirebrick: 'b22222',\n\t\t\tfloralwhite: 'fffaf0',\n\t\t\tforestgreen: '228b22',\n\t\t\tfuchsia: 'ff00ff',\n\t\t\tgainsboro: 'dcdcdc',\n\t\t\tghostwhite: 'f8f8ff',\n\t\t\tgold: 'ffd700',\n\t\t\tgoldenrod: 'daa520',\n\t\t\tgray: '808080',\n\t\t\tgreen: '008000',\n\t\t\tgreenyellow: 'adff2f',\n\t\t\thoneydew: 'f0fff0',\n\t\t\thotpink: 'ff69b4',\n\t\t\tindianred: 'cd5c5c',\n\t\t\tindigo: '4b0082',\n\t\t\tivory: 'fffff0',\n\t\t\tkhaki: 'f0e68c',\n\t\t\tlavender: 'e6e6fa',\n\t\t\tlavenderblush: 'fff0f5',\n\t\t\tlawngreen: '7cfc00',\n\t\t\tlemonchiffon: 'fffacd',\n\t\t\tlightblue: 'add8e6',\n\t\t\tlightcoral: 'f08080',\n\t\t\tlightcyan: 'e0ffff',\n\t\t\tlightgoldenrodyellow: 'fafad2',\n\t\t\tlightgrey: 'd3d3d3',\n\t\t\tlightgreen: '90ee90',\n\t\t\tlightpink: 'ffb6c1',\n\t\t\tlightsalmon: 'ffa07a',\n\t\t\tlightseagreen: '20b2aa',\n\t\t\tlightskyblue: '87cefa',\n\t\t\tlightslateblue: '8470ff',\n\t\t\tlightslategray: '778899',\n\t\t\tlightsteelblue: 'b0c4de',\n\t\t\tlightyellow: 'ffffe0',\n\t\t\tlime: '00ff00',\n\t\t\tlimegreen: '32cd32',\n\t\t\tlinen: 'faf0e6',\n\t\t\tmagenta: 'ff00ff',\n\t\t\tmaroon: '800000',\n\t\t\tmediumaquamarine: '66cdaa',\n\t\t\tmediumblue: '0000cd',\n\t\t\tmediumorchid: 'ba55d3',\n\t\t\tmediumpurple: '9370d8',\n\t\t\tmediumseagreen: '3cb371',\n\t\t\tmediumslateblue: '7b68ee',\n\t\t\tmediumspringgreen: '00fa9a',\n\t\t\tmediumturquoise: '48d1cc',\n\t\t\tmediumvioletred: 'c71585',\n\t\t\tmidnightblue: '191970',\n\t\t\tmintcream: 'f5fffa',\n\t\t\tmistyrose: 'ffe4e1',\n\t\t\tmoccasin: 'ffe4b5',\n\t\t\tnavajowhite: 'ffdead',\n\t\t\tnavy: '000080',\n\t\t\toldlace: 'fdf5e6',\n\t\t\tolive: '808000',\n\t\t\tolivedrab: '6b8e23',\n\t\t\torange: 'ffa500',\n\t\t\torangered: 'ff4500',\n\t\t\torchid: 'da70d6',\n\t\t\tpalegoldenrod: 'eee8aa',\n\t\t\tpalegreen: '98fb98',\n\t\t\tpaleturquoise: 'afeeee',\n\t\t\tpalevioletred: 'd87093',\n\t\t\tpapayawhip: 'ffefd5',\n\t\t\tpeachpuff: 'ffdab9',\n\t\t\tperu: 'cd853f',\n\t\t\tpink: 'ffc0cb',\n\t\t\tplum: 'dda0dd',\n\t\t\tpowderblue: 'b0e0e6',\n\t\t\tpurple: '800080',\n\t\t\tred: 'ff0000',\n\t\t\trosybrown: 'bc8f8f',\n\t\t\troyalblue: '4169e1',\n\t\t\tsaddlebrown: '8b4513',\n\t\t\tsalmon: 'fa8072',\n\t\t\tsandybrown: 'f4a460',\n\t\t\tseagreen: '2e8b57',\n\t\t\tseashell: 'fff5ee',\n\t\t\tsienna: 'a0522d',\n\t\t\tsilver: 'c0c0c0',\n\t\t\tskyblue: '87ceeb',\n\t\t\tslateblue: '6a5acd',\n\t\t\tslategray: '708090',\n\t\t\tsnow: 'fffafa',\n\t\t\tspringgreen: '00ff7f',\n\t\t\tsteelblue: '4682b4',\n\t\t\ttan: 'd2b48c',\n\t\t\tteal: '008080',\n\t\t\tthistle: 'd8bfd8',\n\t\t\ttomato: 'ff6347',\n\t\t\tturquoise: '40e0d0',\n\t\t\tviolet: 'ee82ee',\n\t\t\tvioletred: 'd02090',\n\t\t\twheat: 'f5deb3',\n\t\t\twhite: 'ffffff',\n\t\t\twhitesmoke: 'f5f5f5',\n\t\t\tyellow: 'ffff00',\n\t\t\tyellowgreen: '9acd32'\n\t\t}\n\t\tfor (const key in simple_colors) {\n\t\t\tif (color_string == key) {\n\t\t\t\tcolor_string = simple_colors[key]\n\t\t\t}\n\t\t}\n\t\t// emd of simple type-in colors\n\n\t\t// array of color definition objects\n\t\tconst color_defs = [\n\t\t\t{\n\t\t\t\tre: /^rgb\\((\\d{1,3}),\\s*(\\d{1,3}),\\s*(\\d{1,3})\\)$/,\n\t\t\t\texample: ['rgb(123, 234, 45)', 'rgb(255,234,245)'],\n\t\t\t\tprocess: function (bits){\n\t\t\t\t\treturn [\n\t\t\t\t\t\tparseInt(bits[1]),\n\t\t\t\t\t\tparseInt(bits[2]),\n\t\t\t\t\t\tparseInt(bits[3])\n\t\t\t\t\t]\n\t\t\t\t}\n\t\t\t},\n\t\t\t{\n\t\t\t\tre: /^(\\w{2})(\\w{2})(\\w{2})$/,\n\t\t\t\texample: ['#00ff00', '336699'],\n\t\t\t\tprocess: function (bits){\n\t\t\t\t\treturn [\n\t\t\t\t\t\tparseInt(bits[1], 16),\n\t\t\t\t\t\tparseInt(bits[2], 16),\n\t\t\t\t\t\tparseInt(bits[3], 16)\n\t\t\t\t\t]\n\t\t\t\t}\n\t\t\t},\n\t\t\t{\n\t\t\t\tre: /^(\\w{1})(\\w{1})(\\w{1})$/,\n\t\t\t\texample: ['#fb0', 'f0f'],\n\t\t\t\tprocess: function (bits){\n\t\t\t\t\treturn [\n\t\t\t\t\t\tparseInt(bits[1] + bits[1], 16),\n\t\t\t\t\t\tparseInt(bits[2] + bits[2], 16),\n\t\t\t\t\t\tparseInt(bits[3] + bits[3], 16)\n\t\t\t\t\t]\n\t\t\t\t}\n\t\t\t}\n\t\t]\n\n\t\t// search through the definitions to find a match\n\t\tfor (let i = 0; i < color_defs.length; i++) {\n\t\t\tconst {re} = color_defs[i]\n\t\t\tconst processor = color_defs[i].process\n\t\t\tconst bits = re.exec(color_string)\n\t\t\tif (bits) {\n\t\t\t\tchannels = processor(bits)\n\t\t\t\tthis.r = channels[0]\n\t\t\t\tthis.g = channels[1]\n\t\t\t\tthis.b = channels[2]\n\t\t\t\tthis.ok = true\n\t\t\t}\n\n\t\t}\n\n\t\t// validate/cleanup values\n\t\tthis.r = (this.r < 0 || isNaN(this.r)) ? 0 : ((this.r > 255) ? 255 : this.r)\n\t\tthis.g = (this.g < 0 || isNaN(this.g)) ? 0 : ((this.g > 255) ? 255 : this.g)\n\t\tthis.b = (this.b < 0 || isNaN(this.b)) ? 0 : ((this.b > 255) ? 255 : this.b)\n\n\t\t// some getters\n\t\tthis.toRGB = function () {\n\t\t\treturn `rgb(${  this.r  }, ${  this.g  }, ${  this.b  })`\n\t\t}\n\t\tthis.toHex = function () {\n\t\t\tlet r = this.r.toString(16)\n\t\t\tlet g = this.g.toString(16)\n\t\t\tlet b = this.b.toString(16)\n\t\t\tif (r.length == 1) r = `0${  r}`\n\t\t\tif (g.length == 1) g = `0${  g}`\n\t\t\tif (b.length == 1) b = `0${  b}`\n\t\t\treturn `#${  r  }${g  }${b}`\n\t\t}\n\n\t\t// help\n\t\tthis.getHelpXML = function () {\n\n\t\t\tconst examples = new Array()\n\t\t\t// add regexps\n\t\t\tfor (var i = 0; i < color_defs.length; i++) {\n\t\t\t\tconst {example} = color_defs[i]\n\t\t\t\tfor (let j = 0; j < example.length; j++) {\n\t\t\t\t\texamples[examples.length] = example[j]\n\t\t\t\t}\n\t\t\t}\n\t\t\t// add type-in colors\n\t\t\tfor (const sc in simple_colors) {\n\t\t\t\texamples[examples.length] = sc\n\t\t\t}\n\n\t\t\tconst xml = document.createElement('ul')\n\t\t\txml.setAttribute('id', 'rgbcolor-examples')\n\t\t\tfor (var i = 0; i < examples.length; i++) {\n\t\t\t\ttry {\n\t\t\t\t\tconst list_item = document.createElement('li')\n\t\t\t\t\tconst list_color = new RGBColor(examples[i])\n\t\t\t\t\tconst example_div = document.createElement('div')\n\t\t\t\t\texample_div.style.cssText =\n\t\t\t\t\t\t\t`${'margin: 3px; '\n\t\t\t\t\t\t\t+ 'border: 1px solid black; '\n\t\t\t\t\t\t\t+ 'background:'}${  list_color.toHex()  }; `\n\t\t\t\t\t\t\t+ `color:${  list_color.toHex()}`\n\t\t\t\t\t\n\t\t\t\t\texample_div.appendChild(document.createTextNode('test'))\n\t\t\t\t\tconst list_item_value = document.createTextNode(\n\t\t\t\t\t\t` ${  examples[i]  } -> ${  list_color.toRGB()  } -> ${  list_color.toHex()}`\n\t\t\t\t\t)\n\t\t\t\t\tlist_item.appendChild(example_div)\n\t\t\t\t\tlist_item.appendChild(list_item_value)\n\t\t\t\t\txml.appendChild(list_item)\n\n\t\t\t\t} catch(e){}\n\t\t\t}\n\t\t\treturn xml\n\n\t\t}\n\n\t}\n\n    // export as AMD...\n    if ( typeof define !== 'undefined' && define.amd ) {\n        define( function () { return RGBColor })\n    }\n\n    // ...or as browserify\n    else if ( typeof module !== 'undefined' && module.exports ) {\n        module.exports = RGBColor\n    }\n\n    global.RGBColor = RGBColor\n\n}( typeof window !== 'undefined' ? window : this ));\n/*\n * canvg.js - Javascript SVG parser and renderer on Canvas\n * MIT Licensed\n * Gabe Lerner (gabelerner@gmail.com)\n * http://code.google.com/p/canvg/\n *\n * Requires: rgbcolor.js - http://www.phpied.com/rgb-color-parser-in-javascript/\n */\n (function ( global, factory ) {\n\n\t\n\n\t// export as AMD...\n\tif ( typeof define !== 'undefined' && define.amd ) {\n\t\tdefine('canvgModule', [ 'rgbcolor', 'stackblur' ], factory )\n\t}\n\n\t// ...or as browserify\n\telse if ( typeof module !== 'undefined' && module.exports ) {\n\t\tmodule.exports = factory( require( 'rgbcolor' ), require( 'stackblur' ) )\n\t}\n\n\tglobal.canvg = factory( global.RGBColor, global.stackBlur )\n\n}( typeof window !== 'undefined' ? window : this, function ( RGBColor, stackBlur ) {\n\n\tif (typeof Element === 'undefined') {\n\t   return undefined\n\t}\n\n\t// canvg(target, s)\n\t// empty parameters: replace all 'svg' elements on page with 'canvas' elements\n\t// target: canvas element or the id of a canvas element\n\t// s: svg string, url to svg file, or xml document\n\t// opts: optional hash of options\n\t//\t\t ignoreMouse: true => ignore mouse events\n\t//\t\t ignoreAnimation: true => ignore animations\n\t//\t\t ignoreDimensions: true => does not try to resize canvas\n\t//\t\t ignoreClear: true => does not clear canvas\n\t//\t\t offsetX: int => draws at a x offset\n\t//\t\t offsetY: int => draws at a y offset\n\t//\t\t scaleWidth: int => scales horizontally to width\n\t//\t\t scaleHeight: int => scales vertically to height\n\t//\t\t renderCallback: function => will call the function after the first render is completed\n\t//\t\t forceRedraw: function => will call the function on every frame, if it returns true, will redraw\n\tvar canvg = function (target, s, opts) {\n\t\t// no parameters\n\t\tif (target == null && s == null && opts == null) {\n\t\t\tconst svgTags = document.querySelectorAll('svg')\n\t\t\tfor (let i=0; i<svgTags.length; i++) {\n\t\t\t\tconst svgTag = svgTags[i]\n\t\t\t\tconst c = document.createElement('canvas')\n\t\t\t\tc.width = svgTag.clientWidth\n\t\t\t\tc.height = svgTag.clientHeight\n\t\t\t\tsvgTag.parentNode.insertBefore(c, svgTag)\n\t\t\t\tsvgTag.parentNode.removeChild(svgTag)\n\t\t\t\tconst div = document.createElement('div')\n\t\t\t\tdiv.appendChild(svgTag)\n\t\t\t\tcanvg(c, div.innerHTML)\n\t\t\t}\n\t\t\treturn\n\t\t}\n\n\t\tif (typeof target === 'string') {\n\t\t\ttarget = document.getElementById(target)\n\t\t}\n\n\t\t// store class on canvas\n\t\tif (target.svg != null) target.svg.stop()\n\t\tconst svg = build(opts || {})\n\t\t// on i.e. 8 for flash canvas, we can't assign the property so check for it\n\t\tif (!(target.childNodes.length == 1 && target.childNodes[0].nodeName == 'OBJECT')) target.svg = svg\n\n\t\tconst ctx = target.getContext('2d')\n\t\tif (typeof s.documentElement !== 'undefined') {\n\t\t\t// load from xml doc\n\t\t\tsvg.loadXmlDoc(ctx, s)\n\t\t}\n\t\telse if (s.substr(0,1) == '<') {\n\t\t\t// load from xml string\n\t\t\tsvg.loadXml(ctx, s)\n\t\t}\n\t\telse {\n\t\t\t// load from url\n\t\t\tsvg.load(ctx, s)\n\t\t}\n\t}\n\n\t// see https://developer.mozilla.org/en-US/docs/Web/API/Element.matches\n\tlet matchesSelector\n\tif (typeof Element.prototype.matches !== 'undefined') {\n\t\tmatchesSelector = function(node, selector) {\n\t\t\treturn node.matches(selector)\n\t\t}\n\t} else if (typeof Element.prototype.webkitMatchesSelector !== 'undefined') {\n\t\tmatchesSelector = function(node, selector) {\n\t\t\treturn node.webkitMatchesSelector(selector)\n\t\t}\n\t} else if (typeof Element.prototype.mozMatchesSelector !== 'undefined') {\n\t\tmatchesSelector = function(node, selector) {\n\t\t\treturn node.mozMatchesSelector(selector)\n\t\t}\n\t} else if (typeof Element.prototype.msMatchesSelector !== 'undefined') {\n\t\tmatchesSelector = function(node, selector) {\n\t\t\treturn node.msMatchesSelector(selector)\n\t\t}\n\t} else if (typeof Element.prototype.oMatchesSelector !== 'undefined') {\n\t\tmatchesSelector = function(node, selector) {\n\t\t\treturn node.oMatchesSelector(selector)\n\t\t}\n\t} else {\n\t\t// requires Sizzle: https://github.com/jquery/sizzle/wiki/Sizzle-Documentation\n\t\t// or jQuery: http://jquery.com/download/\n\t\t// or Zepto: http://zeptojs.com/#\n\t\t// without it, this is a ReferenceError\n\n\t\tif (typeof jQuery === 'function' || typeof Zepto === 'function') {\n\t\t\tmatchesSelector = function (node, selector) {\n\t\t\t\treturn $(node).is(selector)\n\t\t\t}\n\t\t}\n\n\t\tif (typeof matchesSelector === 'undefined') {\n\t\t\tmatchesSelector = Sizzle.matchesSelector\n\t\t}\n\t}\n\n\t// slightly modified version of https://github.com/keeganstreet/specificity/blob/master/specificity.js\n\tconst attributeRegex = /(\\[[^\\]]+\\])/g\n\tconst idRegex = /(#[^\\s\\+>~\\.\\[:]+)/g\n\tconst classRegex = /(\\.[^\\s\\+>~\\.\\[:]+)/g\n\tconst pseudoElementRegex = /(::[^\\s\\+>~\\.\\[:]+|:first-line|:first-letter|:before|:after)/gi\n\tconst pseudoClassWithBracketsRegex = /(:[\\w-]+\\([^\\)]*\\))/gi\n\tconst pseudoClassRegex = /(:[^\\s\\+>~\\.\\[:]+)/g\n\tconst elementRegex = /([^\\s\\+>~\\.\\[:]+)/g\n\tfunction getSelectorSpecificity(selector) {\n\t\tconst typeCount = [0, 0, 0]\n\t\tconst findMatch = function(regex, type) {\n\t\t\tconst matches = selector.match(regex)\n\t\t\tif (matches == null) {\n\t\t\t\treturn\n\t\t\t}\n\t\t\ttypeCount[type] += matches.length\n\t\t\tselector = selector.replace(regex, ' ')\n\t\t}\n\n\t\tselector = selector.replace(/:not\\(([^\\)]*)\\)/g, '     $1 ')\n\t\tselector = selector.replace(/{[\\s\\S]*/gm, ' ')\n\t\tfindMatch(attributeRegex, 1)\n\t\tfindMatch(idRegex, 0)\n\t\tfindMatch(classRegex, 1)\n\t\tfindMatch(pseudoElementRegex, 2)\n\t\tfindMatch(pseudoClassWithBracketsRegex, 1)\n\t\tfindMatch(pseudoClassRegex, 1)\n\t\tselector = selector.replace(/[\\*\\s\\+>~]/g, ' ')\n\t\tselector = selector.replace(/[#\\.]/g, ' ')\n\t\tfindMatch(elementRegex, 2)\n\t\treturn typeCount.join('')\n\t}\n\n\tfunction build(opts) {\n\t\tconst svg = { opts: opts }\n\n\t\tsvg.FRAMERATE = 30\n\t\tsvg.MAX_VIRTUAL_PIXELS = 30000\n\n\t\tsvg.log = function(msg) {}\n\t\tif (svg.opts.log == true && typeof console !== 'undefined') {\n\t\t\tsvg.log = function(msg) { console.log(msg) }\n\t\t};\n\n\t\t// globals\n\t\tsvg.init = function(ctx) {\n\t\t\tlet uniqueId = 0\n\t\t\tsvg.UniqueId = function () { uniqueId++; return `canvg${  uniqueId}`\t}\n\t\t\tsvg.Definitions = {}\n\t\t\tsvg.Styles = {}\n\t\t\tsvg.StylesSpecificity = {}\n\t\t\tsvg.Animations = []\n\t\t\tsvg.Images = []\n\t\t\tsvg.ctx = ctx\n\t\t\tsvg.ViewPort = new (function () {\n\t\t\t\tthis.viewPorts = []\n\t\t\t\tthis.Clear = function() { this.viewPorts = [] }\n\t\t\t\tthis.SetCurrent = function(width, height) { this.viewPorts.push({ width: width, height: height }) }\n\t\t\t\tthis.RemoveCurrent = function() { this.viewPorts.pop() }\n\t\t\t\tthis.Current = function() { return this.viewPorts[this.viewPorts.length - 1] }\n\t\t\t\tthis.width = function() { return this.Current().width }\n\t\t\t\tthis.height = function() { return this.Current().height }\n\t\t\t\tthis.ComputeSize = function(d) {\n\t\t\t\t\tif (d != null && typeof d === 'number') return d\n\t\t\t\t\tif (d == 'x') return this.width()\n\t\t\t\t\tif (d == 'y') return this.height()\n\t\t\t\t\treturn Math.sqrt(Math.pow(this.width(), 2) + Math.pow(this.height(), 2)) / Math.sqrt(2)\n\t\t\t\t}\n\t\t\t})\n\t\t}\n\t\tsvg.init()\n\n\t\t// images loaded\n\t\tsvg.ImagesLoaded = function() {\n\t\t\tfor (let i=0; i<svg.Images.length; i++) {\n\t\t\t\tif (!svg.Images[i].loaded) return false\n\t\t\t}\n\t\t\treturn true\n\t\t}\n\n\t\t// trim\n\t\tsvg.trim = function(s) { return s.replace(/^\\s+|\\s+$/g, '') }\n\n\t\t// compress spaces\n\t\tsvg.compressSpaces = function(s) { return s.replace(/[\\s\\r\\t\\n]+/gm,' ') }\n\n\t\t// ajax\n\t\tsvg.ajax = function(url) {\n\t\t\tlet AJAX\n\t\t\tif(window.XMLHttpRequest){AJAX=new XMLHttpRequest()}\n\t\t\telse{AJAX=new ActiveXObject('Microsoft.XMLHTTP')}\n\t\t\tif(AJAX){\n\t\t\t   AJAX.open('GET',url,false)\n\t\t\t   AJAX.send(null)\n\t\t\t   return AJAX.responseText\n\t\t\t}\n\t\t\treturn null\n\t\t}\n\n\t\t// parse xml\n\t\tsvg.parseXml = function(xml) {\n\t\t\tif (typeof Windows !== 'undefined' && typeof Windows.Data !== 'undefined' && typeof Windows.Data.Xml !== 'undefined') {\n\t\t\t\tvar xmlDoc = new Windows.Data.Xml.Dom.XmlDocument()\n\t\t\t\tconst settings = new Windows.Data.Xml.Dom.XmlLoadSettings()\n\t\t\t\tsettings.prohibitDtd = false\n\t\t\t\txmlDoc.loadXml(xml, settings)\n\t\t\t\treturn xmlDoc\n\t\t\t}\n\t\t\telse if (window.DOMParser)\n\t\t\t{\n\t\t\t\ttry {\n\t\t\t\t\tvar parser = new DOMParser()\n\t\t\t\t\treturn parser.parseFromString(xml, 'image/svg+xml')\n\t\t\t\t}\n\t\t\t\tcatch(e){\n\t\t\t\t\tparser = new DOMParser()\n\t\t\t\t\treturn parser.parseFromString(xml, 'text/xml')\n\t\t\t\t}\n\t\t\t}\n\t\t\telse\n\t\t\t{\n\t\t\t\txml = xml.replace(/<!DOCTYPE svg[^>]*>/, '')\n\t\t\t\tvar xmlDoc = new ActiveXObject('Microsoft.XMLDOM')\n\t\t\t\txmlDoc.async = 'false'\n\t\t\t\txmlDoc.loadXML(xml)\n\t\t\t\treturn xmlDoc\n\t\t\t}\n\t\t}\n\n\t\tsvg.Property = function(name, value) {\n\t\t\tthis.name = name\n\t\t\tthis.value = value\n\t\t}\n\t\t\tsvg.Property.prototype.getValue = function() {\n\t\t\t\treturn this.value\n\t\t\t}\n\n\t\t\tsvg.Property.prototype.hasValue = function() {\n\t\t\t\treturn (this.value != null && this.value !== '')\n\t\t\t}\n\n\t\t\t// return the numerical value of the property\n\t\t\tsvg.Property.prototype.numValue = function() {\n\t\t\t\tif (!this.hasValue()) return 0\n\n\t\t\t\tlet n = parseFloat(this.value)\n\t\t\t\tif ((`${this.value  }`).match(/%$/)) {\n\t\t\t\t\tn /= 100.0\n\t\t\t\t}\n\t\t\t\treturn n\n\t\t\t}\n\n\t\t\tsvg.Property.prototype.valueOrDefault = function(def) {\n\t\t\t\tif (this.hasValue()) return this.value\n\t\t\t\treturn def\n\t\t\t}\n\n\t\t\tsvg.Property.prototype.numValueOrDefault = function(def) {\n\t\t\t\tif (this.hasValue()) return this.numValue()\n\t\t\t\treturn def\n\t\t\t}\n\n\t\t\t// color extensions\n\t\t\t\t// augment the current color value with the opacity\n\t\t\t\tsvg.Property.prototype.addOpacity = function(opacityProp) {\n\t\t\t\t\tlet newValue = this.value\n\t\t\t\t\tif (opacityProp.value != null && opacityProp.value != '' && typeof this.value === 'string') { // can only add opacity to colors, not patterns\n\t\t\t\t\t\tconst color = new RGBColor(this.value)\n\t\t\t\t\t\tif (color.ok) {\n\t\t\t\t\t\t\tnewValue = `rgba(${  color.r  }, ${  color.g  }, ${  color.b  }, ${  opacityProp.numValue()  })`\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\t\t\t\t\treturn new svg.Property(this.name, newValue)\n\t\t\t\t}\n\n\t\t\t// definition extensions\n\t\t\t\t// get the definition from the definitions table\n\t\t\t\tsvg.Property.prototype.getDefinition = function() {\n\t\t\t\t\tlet name = this.value.match(/#([^\\)'\"]+)/)\n\t\t\t\t\tif (name) { name = name[1] }\n\t\t\t\t\tif (!name) { name = this.value }\n\t\t\t\t\treturn svg.Definitions[name]\n\t\t\t\t}\n\n\t\t\t\tsvg.Property.prototype.isUrlDefinition = function() {\n\t\t\t\t\treturn this.value.indexOf('url(') == 0\n\t\t\t\t}\n\n\t\t\t\tsvg.Property.prototype.getFillStyleDefinition = function(e, opacityProp) {\n\t\t\t\t\tlet def = this.getDefinition()\n\n\t\t\t\t\t// gradient\n\t\t\t\t\tif (def != null && def.createGradient) {\n\t\t\t\t\t\treturn def.createGradient(svg.ctx, e, opacityProp)\n\t\t\t\t\t}\n\n\t\t\t\t\t// pattern\n\t\t\t\t\tif (def != null && def.createPattern) {\n\t\t\t\t\t\tif (def.getHrefAttribute().hasValue()) {\n\t\t\t\t\t\t\tconst pt = def.attribute('patternTransform')\n\t\t\t\t\t\t\tdef = def.getHrefAttribute().getDefinition()\n\t\t\t\t\t\t\tif (pt.hasValue()) { def.attribute('patternTransform', true).value = pt.value }\n\t\t\t\t\t\t}\n\t\t\t\t\t\treturn def.createPattern(svg.ctx, e)\n\t\t\t\t\t}\n\n\t\t\t\t\treturn null\n\t\t\t\t}\n\n\t\t\t// length extensions\n\t\t\t\tsvg.Property.prototype.getDPI = function(viewPort) {\n\t\t\t\t\treturn 96.0 // TODO: compute?\n\t\t\t\t}\n\n\t\t\t\tsvg.Property.prototype.getEM = function(viewPort) {\n\t\t\t\t\tlet em = 12\n\n\t\t\t\t\tconst fontSize = new svg.Property('fontSize', svg.Font.Parse(svg.ctx.font).fontSize)\n\t\t\t\t\tif (fontSize.hasValue()) em = fontSize.toPixels(viewPort)\n\n\t\t\t\t\treturn em\n\t\t\t\t}\n\n\t\t\t\tsvg.Property.prototype.getUnits = function() {\n\t\t\t\t\tconst s = `${this.value}`\n\t\t\t\t\treturn s.replace(/[0-9\\.\\-]/g,'')\n\t\t\t\t}\n\n\t\t\t\t// get the length as pixels\n\t\t\t\tsvg.Property.prototype.toPixels = function(viewPort, processPercent) {\n\t\t\t\t\tif (!this.hasValue()) return 0\n\t\t\t\t\tconst s = `${this.value}`\n\t\t\t\t\tif (s.match(/em$/)) return this.numValue() * this.getEM(viewPort)\n\t\t\t\t\tif (s.match(/ex$/)) return this.numValue() * this.getEM(viewPort) / 2.0\n\t\t\t\t\tif (s.match(/px$/)) return this.numValue()\n\t\t\t\t\tif (s.match(/pt$/)) return this.numValue() * this.getDPI(viewPort) * (1.0 / 72.0)\n\t\t\t\t\tif (s.match(/pc$/)) return this.numValue() * 15\n\t\t\t\t\tif (s.match(/cm$/)) return this.numValue() * this.getDPI(viewPort) / 2.54\n\t\t\t\t\tif (s.match(/mm$/)) return this.numValue() * this.getDPI(viewPort) / 25.4\n\t\t\t\t\tif (s.match(/in$/)) return this.numValue() * this.getDPI(viewPort)\n\t\t\t\t\tif (s.match(/%$/)) return this.numValue() * svg.ViewPort.ComputeSize(viewPort)\n\t\t\t\t\tconst n = this.numValue()\n\t\t\t\t\tif (processPercent && n < 1.0) return n * svg.ViewPort.ComputeSize(viewPort)\n\t\t\t\t\treturn n\n\t\t\t\t}\n\n\t\t\t// time extensions\n\t\t\t\t// get the time as milliseconds\n\t\t\t\tsvg.Property.prototype.toMilliseconds = function() {\n\t\t\t\t\tif (!this.hasValue()) return 0\n\t\t\t\t\tconst s = `${this.value}`\n\t\t\t\t\tif (s.match(/s$/)) return this.numValue() * 1000\n\t\t\t\t\tif (s.match(/ms$/)) return this.numValue()\n\t\t\t\t\treturn this.numValue()\n\t\t\t\t}\n\n\t\t\t// angle extensions\n\t\t\t\t// get the angle as radians\n\t\t\t\tsvg.Property.prototype.toRadians = function() {\n\t\t\t\t\tif (!this.hasValue()) return 0\n\t\t\t\t\tconst s = `${this.value}`\n\t\t\t\t\tif (s.match(/deg$/)) return this.numValue() * (Math.PI / 180.0)\n\t\t\t\t\tif (s.match(/grad$/)) return this.numValue() * (Math.PI / 200.0)\n\t\t\t\t\tif (s.match(/rad$/)) return this.numValue()\n\t\t\t\t\treturn this.numValue() * (Math.PI / 180.0)\n\t\t\t\t}\n\n\t\t\t// text extensions\n\t\t\t\t// get the text baseline\n\t\t\t\tconst textBaselineMapping = {\n\t\t\t\t\tbaseline: 'alphabetic',\n\t\t\t\t\t'before-edge': 'top',\n\t\t\t\t\t'text-before-edge': 'top',\n\t\t\t\t\tmiddle: 'middle',\n\t\t\t\t\tcentral: 'middle',\n\t\t\t\t\t'after-edge': 'bottom',\n\t\t\t\t\t'text-after-edge': 'bottom',\n\t\t\t\t\tideographic: 'ideographic',\n\t\t\t\t\talphabetic: 'alphabetic',\n\t\t\t\t\thanging: 'hanging',\n\t\t\t\t\tmathematical: 'alphabetic'\n\t\t\t\t}\n\t\t\t\tsvg.Property.prototype.toTextBaseline = function () {\n\t\t\t\t\tif (!this.hasValue()) return null\n\t\t\t\t\treturn textBaselineMapping[this.value]\n\t\t\t\t}\n\n\t\t// fonts\n\t\tsvg.Font = new (function() {\n\t\t\tthis.Styles = 'normal|italic|oblique|inherit'\n\t\t\tthis.Variants = 'normal|small-caps|inherit'\n\t\t\tthis.Weights = 'normal|bold|bolder|lighter|100|200|300|400|500|600|700|800|900|inherit'\n\n\t\t\tthis.CreateFont = function(fontStyle, fontVariant, fontWeight, fontSize, fontFamily, inherit) {\n\t\t\t\tconst f = inherit != null ? this.Parse(inherit) : this.CreateFont('', '', '', '', '', svg.ctx.font)\n\t\t\t\treturn {\n\t\t\t\t\tfontFamily: fontFamily || f.fontFamily,\n\t\t\t\t\tfontSize: fontSize || f.fontSize,\n\t\t\t\t\tfontStyle: fontStyle || f.fontStyle,\n\t\t\t\t\tfontWeight: fontWeight || f.fontWeight,\n\t\t\t\t\tfontVariant: fontVariant || f.fontVariant,\n\t\t\t\t\ttoString: function () { return [this.fontStyle, this.fontVariant, this.fontWeight, this.fontSize, this.fontFamily].join(' ') }\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tconst that = this\n\t\t\tthis.Parse = function(s) {\n\t\t\t\tconst f = {}\n\t\t\t\tconst d = svg.trim(svg.compressSpaces(s || '')).split(' ')\n\t\t\t\tconst set = { fontSize: false, fontStyle: false, fontWeight: false, fontVariant: false }\n\t\t\t\tlet ff = ''\n\t\t\t\tfor (let i=0; i<d.length; i++) {\n\t\t\t\t\tif (!set.fontStyle && that.Styles.indexOf(d[i]) != -1) { if (d[i] != 'inherit') f.fontStyle = d[i]; set.fontStyle = true }\n\t\t\t\t\telse if (!set.fontVariant && that.Variants.indexOf(d[i]) != -1) { if (d[i] != 'inherit') f.fontVariant = d[i]; set.fontStyle = set.fontVariant = true\t}\n\t\t\t\t\telse if (!set.fontWeight && that.Weights.indexOf(d[i]) != -1) {\tif (d[i] != 'inherit') f.fontWeight = d[i]; set.fontStyle = set.fontVariant = set.fontWeight = true }\n\t\t\t\t\telse if (!set.fontSize) { if (d[i] != 'inherit') f.fontSize = d[i].split('/')[0]; set.fontStyle = set.fontVariant = set.fontWeight = set.fontSize = true }\n\t\t\t\t\telse if (d[i] != 'inherit') ff += d[i]\n\t\t\t\t} if (ff != '') f.fontFamily = ff\n\t\t\t\treturn f\n\t\t\t}\n\t\t})\n\n\t\t// points and paths\n\t\tsvg.ToNumberArray = function(s) {\n\t\t\tconst a = svg.trim(svg.compressSpaces((s || '').replace(/,/g, ' '))).split(' ')\n\t\t\tfor (let i=0; i<a.length; i++) {\n\t\t\t\ta[i] = parseFloat(a[i])\n\t\t\t}\n\t\t\treturn a\n\t\t}\n\t\tsvg.Point = function(x, y) {\n\t\t\tthis.x = x\n\t\t\tthis.y = y\n\t\t}\n\t\t\tsvg.Point.prototype.angleTo = function(p) {\n\t\t\t\treturn Math.atan2(p.y - this.y, p.x - this.x)\n\t\t\t}\n\n\t\t\tsvg.Point.prototype.applyTransform = function(v) {\n\t\t\t\tconst xp = this.x * v[0] + this.y * v[2] + v[4]\n\t\t\t\tconst yp = this.x * v[1] + this.y * v[3] + v[5]\n\t\t\t\tthis.x = xp\n\t\t\t\tthis.y = yp\n\t\t\t}\n\n\t\tsvg.CreatePoint = function(s) {\n\t\t\tconst a = svg.ToNumberArray(s)\n\t\t\treturn new svg.Point(a[0], a[1])\n\t\t}\n\t\tsvg.CreatePath = function(s) {\n\t\t\tconst a = svg.ToNumberArray(s)\n\t\t\tconst path = []\n\t\t\tfor (let i=0; i<a.length; i+=2) {\n\t\t\t\tpath.push(new svg.Point(a[i], a[i+1]))\n\t\t\t}\n\t\t\treturn path\n\t\t}\n\n\t\t// bounding box\n\t\tsvg.BoundingBox = function(x1, y1, x2, y2) { // pass in initial points if you want\n\t\t\tthis.x1 = Number.NaN\n\t\t\tthis.y1 = Number.NaN\n\t\t\tthis.x2 = Number.NaN\n\t\t\tthis.y2 = Number.NaN\n\n\t\t\tthis.x = function() { return this.x1 }\n\t\t\tthis.y = function() { return this.y1 }\n\t\t\tthis.width = function() { return this.x2 - this.x1 }\n\t\t\tthis.height = function() { return this.y2 - this.y1 }\n\n\t\t\tthis.addPoint = function(x, y) {\n\t\t\t\tif (x != null) {\n\t\t\t\t\tif (isNaN(this.x1) || isNaN(this.x2)) {\n\t\t\t\t\t\tthis.x1 = x\n\t\t\t\t\t\tthis.x2 = x\n\t\t\t\t\t}\n\t\t\t\t\tif (x < this.x1) this.x1 = x\n\t\t\t\t\tif (x > this.x2) this.x2 = x\n\t\t\t\t}\n\n\t\t\t\tif (y != null) {\n\t\t\t\t\tif (isNaN(this.y1) || isNaN(this.y2)) {\n\t\t\t\t\t\tthis.y1 = y\n\t\t\t\t\t\tthis.y2 = y\n\t\t\t\t\t}\n\t\t\t\t\tif (y < this.y1) this.y1 = y\n\t\t\t\t\tif (y > this.y2) this.y2 = y\n\t\t\t\t}\n\t\t\t}\n\t\t\tthis.addX = function(x) { this.addPoint(x, null) }\n\t\t\tthis.addY = function(y) { this.addPoint(null, y) }\n\n\t\t\tthis.addBoundingBox = function(bb) {\n\t\t\t\tthis.addPoint(bb.x1, bb.y1)\n\t\t\t\tthis.addPoint(bb.x2, bb.y2)\n\t\t\t}\n\n\t\t\tthis.addQuadraticCurve = function(p0x, p0y, p1x, p1y, p2x, p2y) {\n\t\t\t\tconst cp1x = p0x + 2/3 * (p1x - p0x) // CP1 = QP0 + 2/3 *(QP1-QP0)\n\t\t\t\tconst cp1y = p0y + 2/3 * (p1y - p0y) // CP1 = QP0 + 2/3 *(QP1-QP0)\n\t\t\t\tconst cp2x = cp1x + 1/3 * (p2x - p0x) // CP2 = CP1 + 1/3 *(QP2-QP0)\n\t\t\t\tconst cp2y = cp1y + 1/3 * (p2y - p0y) // CP2 = CP1 + 1/3 *(QP2-QP0)\n\t\t\t\tthis.addBezierCurve(p0x, p0y, cp1x, cp2x, cp1y,\tcp2y, p2x, p2y)\n\t\t\t}\n\n\t\t\tthis.addBezierCurve = function(p0x, p0y, p1x, p1y, p2x, p2y, p3x, p3y) {\n\t\t\t\t// from http://blog.hackers-cafe.net/2009/06/how-to-calculate-bezier-curves-bounding.html\n\t\t\t\tconst p0 = [p0x, p0y]; const p1 = [p1x, p1y]; const p2 = [p2x, p2y]; const p3 = [p3x, p3y]\n\t\t\t\tthis.addPoint(p0[0], p0[1])\n\t\t\t\tthis.addPoint(p3[0], p3[1])\n\n\t\t\t\tfor (i=0; i<=1; i++) {\n\t\t\t\t\tconst f = function(t) {\n\t\t\t\t\t\treturn Math.pow(1-t, 3) * p0[i]\n\t\t\t\t\t\t+ 3 * Math.pow(1-t, 2) * t * p1[i]\n\t\t\t\t\t\t+ 3 * (1-t) * Math.pow(t, 2) * p2[i]\n\t\t\t\t\t\t+ Math.pow(t, 3) * p3[i]\n\t\t\t\t\t}\n\n\t\t\t\t\tconst b = 6 * p0[i] - 12 * p1[i] + 6 * p2[i]\n\t\t\t\t\tconst a = -3 * p0[i] + 9 * p1[i] - 9 * p2[i] + 3 * p3[i]\n\t\t\t\t\tconst c = 3 * p1[i] - 3 * p0[i]\n\n\t\t\t\t\tif (a == 0) {\n\t\t\t\t\t\tif (b == 0) continue\n\t\t\t\t\t\tconst t = -c / b\n\t\t\t\t\t\tif (t > 0 && t < 1) {\n\t\t\t\t\t\t\tif (i == 0) this.addX(f(t))\n\t\t\t\t\t\t\tif (i == 1) this.addY(f(t))\n\t\t\t\t\t\t}\n\t\t\t\t\t\tcontinue\n\t\t\t\t\t}\n\n\t\t\t\t\tconst b2ac = Math.pow(b, 2) - 4 * c * a\n\t\t\t\t\tif (b2ac < 0) continue\n\t\t\t\t\tconst t1 = (-b + Math.sqrt(b2ac)) / (2 * a)\n\t\t\t\t\tif (t1 > 0 && t1 < 1) {\n\t\t\t\t\t\tif (i == 0) this.addX(f(t1))\n\t\t\t\t\t\tif (i == 1) this.addY(f(t1))\n\t\t\t\t\t}\n\t\t\t\t\tconst t2 = (-b - Math.sqrt(b2ac)) / (2 * a)\n\t\t\t\t\tif (t2 > 0 && t2 < 1) {\n\t\t\t\t\t\tif (i == 0) this.addX(f(t2))\n\t\t\t\t\t\tif (i == 1) this.addY(f(t2))\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tthis.isPointInBox = function(x, y) {\n\t\t\t\treturn (this.x1 <= x && x <= this.x2 && this.y1 <= y && y <= this.y2)\n\t\t\t}\n\n\t\t\tthis.addPoint(x1, y1)\n\t\t\tthis.addPoint(x2, y2)\n\t\t}\n\n\t\t// transforms\n\t\tsvg.Transform = function(v) {\n\t\t\tconst that = this\n\t\t\tthis.Type = {}\n\n\t\t\t// translate\n\t\t\tthis.Type.translate = function(s) {\n\t\t\t\tthis.p = svg.CreatePoint(s)\n\t\t\t\tthis.apply = function(ctx) {\n\t\t\t\t\tctx.translate(this.p.x || 0.0, this.p.y || 0.0)\n\t\t\t\t}\n\t\t\t\tthis.unapply = function(ctx) {\n\t\t\t\t\tctx.translate(-1.0 * this.p.x || 0.0, -1.0 * this.p.y || 0.0)\n\t\t\t\t}\n\t\t\t\tthis.applyToPoint = function(p) {\n\t\t\t\t\tp.applyTransform([1, 0, 0, 1, this.p.x || 0.0, this.p.y || 0.0])\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// rotate\n\t\t\tthis.Type.rotate = function(s) {\n\t\t\t\tconst a = svg.ToNumberArray(s)\n\t\t\t\tthis.angle = new svg.Property('angle', a[0])\n\t\t\t\tthis.cx = a[1] || 0\n\t\t\t\tthis.cy = a[2] || 0\n\t\t\t\tthis.apply = function(ctx) {\n\t\t\t\t\tctx.translate(this.cx, this.cy)\n\t\t\t\t\tctx.rotate(this.angle.toRadians())\n\t\t\t\t\tctx.translate(-this.cx, -this.cy)\n\t\t\t\t}\n\t\t\t\tthis.unapply = function(ctx) {\n\t\t\t\t\tctx.translate(this.cx, this.cy)\n\t\t\t\t\tctx.rotate(-1.0 * this.angle.toRadians())\n\t\t\t\t\tctx.translate(-this.cx, -this.cy)\n\t\t\t\t}\n\t\t\t\tthis.applyToPoint = function(p) {\n\t\t\t\t\tconst a = this.angle.toRadians()\n\t\t\t\t\tp.applyTransform([1, 0, 0, 1, this.p.x || 0.0, this.p.y || 0.0])\n\t\t\t\t\tp.applyTransform([Math.cos(a), Math.sin(a), -Math.sin(a), Math.cos(a), 0, 0])\n\t\t\t\t\tp.applyTransform([1, 0, 0, 1, -this.p.x || 0.0, -this.p.y || 0.0])\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tthis.Type.scale = function(s) {\n\t\t\t\tthis.p = svg.CreatePoint(s)\n\t\t\t\tthis.apply = function(ctx) {\n\t\t\t\t\tctx.scale(this.p.x || 1.0, this.p.y || this.p.x || 1.0)\n\t\t\t\t}\n\t\t\t\tthis.unapply = function(ctx) {\n\t\t\t\t\tctx.scale(1.0 / this.p.x || 1.0, 1.0 / this.p.y || this.p.x || 1.0)\n\t\t\t\t}\n\t\t\t\tthis.applyToPoint = function(p) {\n\t\t\t\t\tp.applyTransform([this.p.x || 0.0, 0, 0, this.p.y || 0.0, 0, 0])\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tthis.Type.matrix = function(s) {\n\t\t\t\tthis.m = svg.ToNumberArray(s)\n\t\t\t\tthis.apply = function(ctx) {\n\t\t\t\t\tctx.transform(this.m[0], this.m[1], this.m[2], this.m[3], this.m[4], this.m[5])\n\t\t\t\t}\n\t\t\t\tthis.unapply = function(ctx) {\n\t\t\t\t\tconst a = this.m[0]\n\t\t\t\t\tconst b = this.m[2]\n\t\t\t\t\tconst c = this.m[4]\n\t\t\t\t\tconst d = this.m[1]\n\t\t\t\t\tconst e = this.m[3]\n\t\t\t\t\tconst f = this.m[5]\n\t\t\t\t\tconst g = 0.0\n\t\t\t\t\tconst h = 0.0\n\t\t\t\t\tconst i = 1.0\n\t\t\t\t\tconst det = 1 / (a*(e*i-f*h)-b*(d*i-f*g)+c*(d*h-e*g))\n\t\t\t\t\tctx.transform(\n\t\t\t\t\t\tdet*(e*i-f*h),\n\t\t\t\t\t\tdet*(f*g-d*i),\n\t\t\t\t\t\tdet*(c*h-b*i),\n\t\t\t\t\t\tdet*(a*i-c*g),\n\t\t\t\t\t\tdet*(b*f-c*e),\n\t\t\t\t\t\tdet*(c*d-a*f)\n\t\t\t\t\t)\n\t\t\t\t}\n\t\t\t\tthis.applyToPoint = function(p) {\n\t\t\t\t\tp.applyTransform(this.m)\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tthis.Type.SkewBase = function(s) {\n\t\t\t\tthis.base = that.Type.matrix\n\t\t\t\tthis.base(s)\n\t\t\t\tthis.angle = new svg.Property('angle', s)\n\t\t\t}\n\t\t\tthis.Type.SkewBase.prototype = new this.Type.matrix\n\n\t\t\tthis.Type.skewX = function(s) {\n\t\t\t\tthis.base = that.Type.SkewBase\n\t\t\t\tthis.base(s)\n\t\t\t\tthis.m = [1, 0, Math.tan(this.angle.toRadians()), 1, 0, 0]\n\t\t\t}\n\t\t\tthis.Type.skewX.prototype = new this.Type.SkewBase\n\n\t\t\tthis.Type.skewY = function(s) {\n\t\t\t\tthis.base = that.Type.SkewBase\n\t\t\t\tthis.base(s)\n\t\t\t\tthis.m = [1, Math.tan(this.angle.toRadians()), 0, 1, 0, 0]\n\t\t\t}\n\t\t\tthis.Type.skewY.prototype = new this.Type.SkewBase\n\n\t\t\tthis.transforms = []\n\n\t\t\tthis.apply = function(ctx) {\n\t\t\t\tfor (let i=0; i<this.transforms.length; i++) {\n\t\t\t\t\tthis.transforms[i].apply(ctx)\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tthis.unapply = function(ctx) {\n\t\t\t\tfor (let i=this.transforms.length-1; i>=0; i--) {\n\t\t\t\t\tthis.transforms[i].unapply(ctx)\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tthis.applyToPoint = function(p) {\n\t\t\t\tfor (let i=0; i<this.transforms.length; i++) {\n\t\t\t\t\tthis.transforms[i].applyToPoint(p)\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tconst data = svg.trim(svg.compressSpaces(v)).replace(/\\)([a-zA-Z])/g, ') $1').replace(/\\)(\\s?,\\s?)/g,') ').split(/\\s(?=[a-z])/)\n\t\t\tfor (let i=0; i<data.length; i++) {\n\t\t\t\tconst type = svg.trim(data[i].split('(')[0])\n\t\t\t\tconst s = data[i].split('(')[1].replace(')','')\n\t\t\t\tconst transformType = this.Type[type]\n\t\t\t\tif (typeof transformType !== 'undefined') {\n\t\t\t\t\tconst transform = new transformType(s)\n\t\t\t\t\ttransform.type = type\n\t\t\t\t\tthis.transforms.push(transform)\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\t// aspect ratio\n\t\tsvg.AspectRatio = function(ctx, aspectRatio, width, desiredWidth, height, desiredHeight, minX, minY, refX, refY) {\n\t\t\t// aspect ratio - http://www.w3.org/TR/SVG/coords.html#PreserveAspectRatioAttribute\n\t\t\taspectRatio = svg.compressSpaces(aspectRatio)\n\t\t\taspectRatio = aspectRatio.replace(/^defer\\s/,'') // ignore defer\n\t\t\tconst align = aspectRatio.split(' ')[0] || 'xMidYMid'\n\t\t\tconst meetOrSlice = aspectRatio.split(' ')[1] || 'meet'\n\n\t\t\t// calculate scale\n\t\t\tconst scaleX = width / desiredWidth\n\t\t\tconst scaleY = height / desiredHeight\n\t\t\tconst scaleMin = Math.min(scaleX, scaleY)\n\t\t\tconst scaleMax = Math.max(scaleX, scaleY)\n\t\t\tif (meetOrSlice == 'meet') { desiredWidth *= scaleMin; desiredHeight *= scaleMin }\n\t\t\tif (meetOrSlice == 'slice') { desiredWidth *= scaleMax; desiredHeight *= scaleMax }\n\n\t\t\trefX = new svg.Property('refX', refX)\n\t\t\trefY = new svg.Property('refY', refY)\n\t\t\tif (refX.hasValue() && refY.hasValue()) {\n\t\t\t\tctx.translate(-scaleMin * refX.toPixels('x'), -scaleMin * refY.toPixels('y'))\n\t\t\t}\n\t\t\telse {\n\t\t\t\t// align\n\t\t\t\tif (align.match(/^xMid/) && ((meetOrSlice == 'meet' && scaleMin == scaleY) || (meetOrSlice == 'slice' && scaleMax == scaleY))) ctx.translate(width / 2.0 - desiredWidth / 2.0, 0)\n\t\t\t\tif (align.match(/YMid$/) && ((meetOrSlice == 'meet' && scaleMin == scaleX) || (meetOrSlice == 'slice' && scaleMax == scaleX))) ctx.translate(0, height / 2.0 - desiredHeight / 2.0)\n\t\t\t\tif (align.match(/^xMax/) && ((meetOrSlice == 'meet' && scaleMin == scaleY) || (meetOrSlice == 'slice' && scaleMax == scaleY))) ctx.translate(width - desiredWidth, 0)\n\t\t\t\tif (align.match(/YMax$/) && ((meetOrSlice == 'meet' && scaleMin == scaleX) || (meetOrSlice == 'slice' && scaleMax == scaleX))) ctx.translate(0, height - desiredHeight)\n\t\t\t}\n\n\t\t\t// scale\n\t\t\tif (align == 'none') ctx.scale(scaleX, scaleY)\n\t\t\telse if (meetOrSlice == 'meet') ctx.scale(scaleMin, scaleMin)\n\t\t\telse if (meetOrSlice == 'slice') ctx.scale(scaleMax, scaleMax)\n\n\t\t\t// translate\n\t\t\tctx.translate(minX == null ? 0 : -minX, minY == null ? 0 : -minY)\n\t\t}\n\n\t\t// elements\n\t\tsvg.Element = {}\n\n\t\tsvg.EmptyProperty = new svg.Property('EMPTY', '')\n\n\t\tsvg.Element.ElementBase = function(node) {\n\t\t\tthis.attributes = {}\n\t\t\tthis.styles = {}\n\t\t\tthis.stylesSpecificity = {}\n\t\t\tthis.children = []\n\n\t\t\t// get or create attribute\n\t\t\tthis.attribute = function(name, createIfNotExists) {\n\t\t\t\tlet a = this.attributes[name]\n\t\t\t\tif (a != null) return a\n\n\t\t\t\tif (createIfNotExists == true) { a = new svg.Property(name, ''); this.attributes[name] = a }\n\t\t\t\treturn a || svg.EmptyProperty\n\t\t\t}\n\n\t\t\tthis.getHrefAttribute = function() {\n\t\t\t\tfor (const a in this.attributes) {\n\t\t\t\t\tif (a == 'href' || a.match(/:href$/)) {\n\t\t\t\t\t\treturn this.attributes[a]\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t\treturn svg.EmptyProperty\n\t\t\t}\n\n\t\t\t// get or create style, crawls up node tree\n\t\t\tthis.style = function(name, createIfNotExists, skipAncestors) {\n\t\t\t\tlet s = this.styles[name]\n\t\t\t\tif (s != null) return s\n\n\t\t\t\tconst a = this.attribute(name)\n\t\t\t\tif (a != null && a.hasValue()) {\n\t\t\t\t\tthis.styles[name] = a // move up to me to cache\n\t\t\t\t\treturn a\n\t\t\t\t}\n\n\t\t\t\tif (skipAncestors != true) {\n\t\t\t\t\tconst p = this.parent\n\t\t\t\t\tif (p != null) {\n\t\t\t\t\t\tconst ps = p.style(name)\n\t\t\t\t\t\tif (ps != null && ps.hasValue()) {\n\t\t\t\t\t\t\treturn ps\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\t\t\t\t}\n\n\t\t\t\tif (createIfNotExists == true) { s = new svg.Property(name, ''); this.styles[name] = s }\n\t\t\t\treturn s || svg.EmptyProperty\n\t\t\t}\n\n\t\t\t// base render\n\t\t\tthis.render = function(ctx) {\n\t\t\t\t// don't render display=none\n\t\t\t\tif (this.style('display').value == 'none') return\n\n\t\t\t\t// don't render visibility=hidden\n\t\t\t\tif (this.style('visibility').value == 'hidden') return\n\n\t\t\t\tctx.save()\n\t\t\t\tif (this.style('mask').hasValue()) { // mask\n\t\t\t\t\tconst mask = this.style('mask').getDefinition()\n\t\t\t\t\tif (mask != null) mask.apply(ctx, this)\n\t\t\t\t}\n\t\t\t\telse if (this.style('filter').hasValue()) { // filter\n\t\t\t\t\tconst filter = this.style('filter').getDefinition()\n\t\t\t\t\tif (filter != null) filter.apply(ctx, this)\n\t\t\t\t}\n\t\t\t\telse {\n\t\t\t\t\tthis.setContext(ctx)\n\t\t\t\t\tthis.renderChildren(ctx)\n\t\t\t\t\tthis.clearContext(ctx)\n\t\t\t\t}\n\t\t\t\tctx.restore()\n\t\t\t}\n\n\t\t\t// base set context\n\t\t\tthis.setContext = function(ctx) {\n\t\t\t\t// OVERRIDE ME!\n\t\t\t}\n\n\t\t\t// base clear context\n\t\t\tthis.clearContext = function(ctx) {\n\t\t\t\t// OVERRIDE ME!\n\t\t\t}\n\n\t\t\t// base render children\n\t\t\tthis.renderChildren = function(ctx) {\n\t\t\t\tfor (let i=0; i<this.children.length; i++) {\n\t\t\t\t\tthis.children[i].render(ctx)\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tthis.addChild = function(childNode, create) {\n\t\t\t\tlet child = childNode\n\t\t\t\tif (create) child = svg.CreateElement(childNode)\n\t\t\t\tchild.parent = this\n\t\t\t\tif (child.type != 'title') { this.children.push(child)\t}\n\t\t\t}\n\n\t\t\tthis.addStylesFromStyleDefinition = function () {\n\t\t\t\t// add styles\n\t\t\t\tfor (const selector in svg.Styles) {\n\t\t\t\t\tif (selector[0] != '@' && matchesSelector(node, selector)) {\n\t\t\t\t\t\tconst styles = svg.Styles[selector]\n\t\t\t\t\t\tconst specificity = svg.StylesSpecificity[selector]\n\t\t\t\t\t\tif (styles != null) {\n\t\t\t\t\t\t\tfor (const name in styles) {\n\t\t\t\t\t\t\t\tlet existingSpecificity = this.stylesSpecificity[name]\n\t\t\t\t\t\t\t\tif (typeof existingSpecificity === 'undefined') {\n\t\t\t\t\t\t\t\t\texistingSpecificity = '000'\n\t\t\t\t\t\t\t\t}\n\t\t\t\t\t\t\t\tif (specificity > existingSpecificity) {\n\t\t\t\t\t\t\t\t\tthis.styles[name] = styles[name]\n\t\t\t\t\t\t\t\t\tthis.stylesSpecificity[name] = specificity\n\t\t\t\t\t\t\t\t}\n\t\t\t\t\t\t\t}\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\t\t\t\n\t\t\t// Microsoft Edge fix\n\t\t\tconst allUppercase = new RegExp(\"^[A-Z\\-]+$\")\n\t\t\tconst normalizeAttributeName = function (name) {\n\t\t\t\tif (allUppercase.test(name)) {\n\t\t\t\t\treturn name.toLowerCase()\n\t\t\t\t}\n\t\t\t\treturn name\n\t\t\t}\n\n\t\t\tif (node != null && node.nodeType == 1) { //ELEMENT_NODE\n\t\t\t\t// add attributes\n\t\t\t\tfor (var i=0; i<node.attributes.length; i++) {\n\t\t\t\t\tconst attribute = node.attributes[i]\n\t\t\t\t\tconst nodeName = normalizeAttributeName(attribute.nodeName)\n\t\t\t\t\tthis.attributes[nodeName] = new svg.Property(nodeName, attribute.value)\n\t\t\t\t}\n\n\t\t\t\tthis.addStylesFromStyleDefinition()\n\n\t\t\t\t// add inline styles\n\t\t\t\tif (this.attribute('style').hasValue()) {\n\t\t\t\t\tconst styles = this.attribute('style').value.split(';')\n\t\t\t\t\tfor (var i=0; i<styles.length; i++) {\n\t\t\t\t\t\tif (svg.trim(styles[i]) != '') {\n\t\t\t\t\t\t\tconst style = styles[i].split(':')\n\t\t\t\t\t\t\tconst name = svg.trim(style[0])\n\t\t\t\t\t\t\tconst value = svg.trim(style[1])\n\t\t\t\t\t\t\tthis.styles[name] = new svg.Property(name, value)\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\t\t\t\t}\n\n\t\t\t\t// add id\n\t\t\t\tif (this.attribute('id').hasValue()) {\n\t\t\t\t\tif (svg.Definitions[this.attribute('id').value] == null) {\n\t\t\t\t\t\tsvg.Definitions[this.attribute('id').value] = this\n\t\t\t\t\t}\n\t\t\t\t}\n\n\t\t\t\t// add children\n\t\t\t\tfor (var i=0; i<node.childNodes.length; i++) {\n\t\t\t\t\tconst childNode = node.childNodes[i]\n\t\t\t\t\tif (childNode.nodeType == 1) this.addChild(childNode, true) //ELEMENT_NODE\n\t\t\t\t\tif (this.captureTextNodes && (childNode.nodeType == 3 || childNode.nodeType == 4)) {\n\t\t\t\t\t\tconst text = childNode.value || childNode.text || childNode.textContent || ''\n\t\t\t\t\t\tif (svg.compressSpaces(text) != '') {\n\t\t\t\t\t\t\tthis.addChild(new svg.Element.tspan(childNode), false) // TEXT_NODE\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\tsvg.Element.RenderedElementBase = function(node) {\n\t\t\tthis.base = svg.Element.ElementBase\n\t\t\tthis.base(node)\n\n\t\t\tthis.setContext = function(ctx) {\n\t\t\t\t// fill\n\t\t\t\tif (this.style('fill').isUrlDefinition()) {\n\t\t\t\t\tvar fs = this.style('fill').getFillStyleDefinition(this, this.style('fill-opacity'))\n\t\t\t\t\tif (fs != null) ctx.fillStyle = fs\n\t\t\t\t}\n\t\t\t\telse if (this.style('fill').hasValue()) {\n\t\t\t\t\tvar fillStyle = this.style('fill')\n\t\t\t\t\tif (fillStyle.value == 'currentColor') fillStyle.value = this.style('color').value\n\t\t\t\t\tif (fillStyle.value != 'inherit') ctx.fillStyle = (fillStyle.value == 'none' ? 'rgba(0,0,0,0)' : fillStyle.value)\n\t\t\t\t}\n\t\t\t\tif (this.style('fill-opacity').hasValue()) {\n\t\t\t\t\tvar fillStyle = new svg.Property('fill', ctx.fillStyle)\n\t\t\t\t\tfillStyle = fillStyle.addOpacity(this.style('fill-opacity'))\n\t\t\t\t\tctx.fillStyle = fillStyle.value\n\t\t\t\t}\n\n\t\t\t\t// stroke\n\t\t\t\tif (this.style('stroke').isUrlDefinition()) {\n\t\t\t\t\tvar fs = this.style('stroke').getFillStyleDefinition(this, this.style('stroke-opacity'))\n\t\t\t\t\tif (fs != null) ctx.strokeStyle = fs\n\t\t\t\t}\n\t\t\t\telse if (this.style('stroke').hasValue()) {\n\t\t\t\t\tvar strokeStyle = this.style('stroke')\n\t\t\t\t\tif (strokeStyle.value == 'currentColor') strokeStyle.value = this.style('color').value\n\t\t\t\t\tif (strokeStyle.value != 'inherit') ctx.strokeStyle = (strokeStyle.value == 'none' ? 'rgba(0,0,0,0)' : strokeStyle.value)\n\t\t\t\t}\n\t\t\t\tif (this.style('stroke-opacity').hasValue()) {\n\t\t\t\t\tvar strokeStyle = new svg.Property('stroke', ctx.strokeStyle)\n\t\t\t\t\tstrokeStyle = strokeStyle.addOpacity(this.style('stroke-opacity'))\n\t\t\t\t\tctx.strokeStyle = strokeStyle.value\n\t\t\t\t}\n\t\t\t\tif (this.style('stroke-width').hasValue()) {\n\t\t\t\t\tconst newLineWidth = this.style('stroke-width').toPixels()\n\t\t\t\t\tctx.lineWidth = newLineWidth == 0 ? 0.001 : newLineWidth // browsers don't respect 0\n\t\t\t    }\n\t\t\t\tif (this.style('stroke-linecap').hasValue()) ctx.lineCap = this.style('stroke-linecap').value\n\t\t\t\tif (this.style('stroke-linejoin').hasValue()) ctx.lineJoin = this.style('stroke-linejoin').value\n\t\t\t\tif (this.style('stroke-miterlimit').hasValue()) ctx.miterLimit = this.style('stroke-miterlimit').value\n\t\t\t\tif (this.style('stroke-dasharray').hasValue() && this.style('stroke-dasharray').value != 'none') {\n\t\t\t\t\tconst gaps = svg.ToNumberArray(this.style('stroke-dasharray').value)\n\t\t\t\t\tif (typeof ctx.setLineDash !== 'undefined') { ctx.setLineDash(gaps) }\n\t\t\t\t\telse if (typeof ctx.webkitLineDash !== 'undefined') { ctx.webkitLineDash = gaps }\n\t\t\t\t\telse if (typeof ctx.mozDash !== 'undefined' && !(gaps.length==1 && gaps[0]==0)) { ctx.mozDash = gaps }\n\n\t\t\t\t\tconst offset = this.style('stroke-dashoffset').numValueOrDefault(1)\n\t\t\t\t\tif (typeof ctx.lineDashOffset !== 'undefined') { ctx.lineDashOffset = offset }\n\t\t\t\t\telse if (typeof ctx.webkitLineDashOffset !== 'undefined') { ctx.webkitLineDashOffset = offset }\n\t\t\t\t\telse if (typeof ctx.mozDashOffset !== 'undefined') { ctx.mozDashOffset = offset }\n\t\t\t\t}\n\n\t\t\t\t// font\n\t\t\t\tif (typeof ctx.font !== 'undefined') {\n\t\t\t\t\tctx.font = svg.Font.CreateFont(\n\t\t\t\t\t\tthis.style('font-style').value,\n\t\t\t\t\t\tthis.style('font-variant').value,\n\t\t\t\t\t\tthis.style('font-weight').value,\n\t\t\t\t\t\tthis.style('font-size').hasValue() ? `${this.style('font-size').toPixels()  }px` : '',\n\t\t\t\t\t\tthis.style('font-family').value).toString()\n\t\t\t\t}\n\n\t\t\t\t// transform\n\t\t\t\tif (this.style('transform', false, true).hasValue()) {\n\t\t\t\t\tconst transform = new svg.Transform(this.style('transform', false, true).value)\n\t\t\t\t\ttransform.apply(ctx)\n\t\t\t\t}\n\n\t\t\t\t// clip\n\t\t\t\tif (this.style('clip-path', false, true).hasValue()) {\n\t\t\t\t\tconst clip = this.style('clip-path', false, true).getDefinition()\n\t\t\t\t\tif (clip != null) clip.apply(ctx)\n\t\t\t\t}\n\n\t\t\t\t// opacity\n\t\t\t\tif (this.style('opacity').hasValue()) {\n\t\t\t\t\tctx.globalAlpha = this.style('opacity').numValue()\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t\tsvg.Element.RenderedElementBase.prototype = new svg.Element.ElementBase\n\n\t\tsvg.Element.PathElementBase = function(node) {\n\t\t\tthis.base = svg.Element.RenderedElementBase\n\t\t\tthis.base(node)\n\n\t\t\tthis.path = function(ctx) {\n\t\t\t\tif (ctx != null) ctx.beginPath()\n\t\t\t\treturn new svg.BoundingBox()\n\t\t\t}\n\n\t\t\tthis.renderChildren = function(ctx) {\n\t\t\t\tthis.path(ctx)\n\t\t\t\tsvg.Mouse.checkPath(this, ctx)\n\t\t\t\tif (ctx.fillStyle != '') {\n\t\t\t\t\tif (this.style('fill-rule').valueOrDefault('inherit') != 'inherit') { ctx.fill(this.style('fill-rule').value) }\n\t\t\t\t\telse { ctx.fill() }\n\t\t\t\t}\n\t\t\t\tif (ctx.strokeStyle != '') ctx.stroke()\n\n\t\t\t\tconst markers = this.getMarkers()\n\t\t\t\tif (markers != null) {\n\t\t\t\t\tif (this.style('marker-start').isUrlDefinition()) {\n\t\t\t\t\t\tvar marker = this.style('marker-start').getDefinition()\n\t\t\t\t\t\tmarker.render(ctx, markers[0][0], markers[0][1])\n\t\t\t\t\t}\n\t\t\t\t\tif (this.style('marker-mid').isUrlDefinition()) {\n\t\t\t\t\t\tvar marker = this.style('marker-mid').getDefinition()\n\t\t\t\t\t\tfor (let i=1;i<markers.length-1;i++) {\n\t\t\t\t\t\t\tmarker.render(ctx, markers[i][0], markers[i][1])\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\t\t\t\t\tif (this.style('marker-end').isUrlDefinition()) {\n\t\t\t\t\t\tvar marker = this.style('marker-end').getDefinition()\n\t\t\t\t\t\tmarker.render(ctx, markers[markers.length-1][0], markers[markers.length-1][1])\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tthis.getBoundingBox = function() {\n\t\t\t\treturn this.path()\n\t\t\t}\n\n\t\t\tthis.getMarkers = function() {\n\t\t\t\treturn null\n\t\t\t}\n\t\t}\n\t\tsvg.Element.PathElementBase.prototype = new svg.Element.RenderedElementBase\n\n\t\t// svg element\n\t\tsvg.Element.svg = function(node) {\n\t\t\tthis.base = svg.Element.RenderedElementBase\n\t\t\tthis.base(node)\n\n\t\t\tthis.baseClearContext = this.clearContext\n\t\t\tthis.clearContext = function(ctx) {\n\t\t\t\tthis.baseClearContext(ctx)\n\t\t\t\tsvg.ViewPort.RemoveCurrent()\n\t\t\t}\n\n\t\t\tthis.baseSetContext = this.setContext\n\t\t\tthis.setContext = function(ctx) {\n\t\t\t\t// initial values and defaults\n\t\t\t\tctx.strokeStyle = 'rgba(0,0,0,0)'\n\t\t\t\tctx.lineCap = 'butt'\n\t\t\t\tctx.lineJoin = 'miter'\n\t\t\t\tctx.miterLimit = 4\n\t\t\t\tif (typeof ctx.font !== 'undefined' && typeof window.getComputedStyle !== 'undefined') {\n\t\t\t\t\tctx.font = window.getComputedStyle(ctx.canvas).getPropertyValue('font')\n\t\t\t\t}\n\n\t\t\t\tthis.baseSetContext(ctx)\n\n\t\t\t\t// create new view port\n\t\t\t\tif (!this.attribute('x').hasValue()) this.attribute('x', true).value = 0\n\t\t\t\tif (!this.attribute('y').hasValue()) this.attribute('y', true).value = 0\n\t\t\t\tctx.translate(this.attribute('x').toPixels('x'), this.attribute('y').toPixels('y'))\n\n\t\t\t\tlet width = svg.ViewPort.width()\n\t\t\t\tlet height = svg.ViewPort.height()\n\n\t\t\t\tif (!this.attribute('width').hasValue()) this.attribute('width', true).value = '100%'\n\t\t\t\tif (!this.attribute('height').hasValue()) this.attribute('height', true).value = '100%'\n\t\t\t\tif (typeof this.root === 'undefined') {\n\t\t\t\t\twidth = this.attribute('width').toPixels('x')\n\t\t\t\t\theight = this.attribute('height').toPixels('y')\n\n\t\t\t\t\tlet x = 0\n\t\t\t\t\tlet y = 0\n\t\t\t\t\tif (this.attribute('refX').hasValue() && this.attribute('refY').hasValue()) {\n\t\t\t\t\t\tx = -this.attribute('refX').toPixels('x')\n\t\t\t\t\t\ty = -this.attribute('refY').toPixels('y')\n\t\t\t\t\t}\n\n\t\t\t\t\tif (this.attribute('overflow').valueOrDefault('hidden') != 'visible') {\n\t\t\t\t\t\tctx.beginPath()\n\t\t\t\t\t\tctx.moveTo(x, y)\n\t\t\t\t\t\tctx.lineTo(width, y)\n\t\t\t\t\t\tctx.lineTo(width, height)\n\t\t\t\t\t\tctx.lineTo(x, height)\n\t\t\t\t\t\tctx.closePath()\n\t\t\t\t\t\tctx.clip()\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t\tsvg.ViewPort.SetCurrent(width, height)\n\n\t\t\t\t// viewbox\n\t\t\t\tif (this.attribute('viewBox').hasValue()) {\n\t\t\t\t\tconst viewBox = svg.ToNumberArray(this.attribute('viewBox').value)\n\t\t\t\t\tconst minX = viewBox[0]\n\t\t\t\t\tconst minY = viewBox[1]\n\t\t\t\t\twidth = viewBox[2]\n\t\t\t\t\theight = viewBox[3]\n\n\t\t\t\t\tsvg.AspectRatio(ctx,\n\t\t\t\t\t\t\t\t\tthis.attribute('preserveAspectRatio').value,\n\t\t\t\t\t\t\t\t\tsvg.ViewPort.width(),\n\t\t\t\t\t\t\t\t\twidth,\n\t\t\t\t\t\t\t\t\tsvg.ViewPort.height(),\n\t\t\t\t\t\t\t\t\theight,\n\t\t\t\t\t\t\t\t\tminX,\n\t\t\t\t\t\t\t\t\tminY,\n\t\t\t\t\t\t\t\t\tthis.attribute('refX').value,\n\t\t\t\t\t\t\t\t\tthis.attribute('refY').value)\n\n\t\t\t\t\tsvg.ViewPort.RemoveCurrent()\n\t\t\t\t\tsvg.ViewPort.SetCurrent(viewBox[2], viewBox[3])\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t\tsvg.Element.svg.prototype = new svg.Element.RenderedElementBase\n\n\t\t// rect element\n\t\tsvg.Element.rect = function(node) {\n\t\t\tthis.base = svg.Element.PathElementBase\n\t\t\tthis.base(node)\n\n\t\t\tthis.path = function(ctx) {\n\t\t\t\tconst x = this.attribute('x').toPixels('x')\n\t\t\t\tconst y = this.attribute('y').toPixels('y')\n\t\t\t\tconst width = this.attribute('width').toPixels('x')\n\t\t\t\tconst height = this.attribute('height').toPixels('y')\n\t\t\t\tlet rx = this.attribute('rx').toPixels('x')\n\t\t\t\tlet ry = this.attribute('ry').toPixels('y')\n\t\t\t\tif (this.attribute('rx').hasValue() && !this.attribute('ry').hasValue()) ry = rx\n\t\t\t\tif (this.attribute('ry').hasValue() && !this.attribute('rx').hasValue()) rx = ry\n\t\t\t\trx = Math.min(rx, width / 2.0)\n\t\t\t\try = Math.min(ry, height / 2.0)\n\t\t\t\tif (ctx != null) {\n\t\t\t\t\tctx.beginPath()\n\t\t\t\t\tctx.moveTo(x + rx, y)\n\t\t\t\t\tctx.lineTo(x + width - rx, y)\n\t\t\t\t\tctx.quadraticCurveTo(x + width, y, x + width, y + ry)\n\t\t\t\t\tctx.lineTo(x + width, y + height - ry)\n\t\t\t\t\tctx.quadraticCurveTo(x + width, y + height, x + width - rx, y + height)\n\t\t\t\t\tctx.lineTo(x + rx, y + height)\n\t\t\t\t\tctx.quadraticCurveTo(x, y + height, x, y + height - ry)\n\t\t\t\t\tctx.lineTo(x, y + ry)\n\t\t\t\t\tctx.quadraticCurveTo(x, y, x + rx, y)\n\t\t\t\t\tctx.closePath()\n\t\t\t\t}\n\n\t\t\t\treturn new svg.BoundingBox(x, y, x + width, y + height)\n\t\t\t}\n\t\t}\n\t\tsvg.Element.rect.prototype = new svg.Element.PathElementBase\n\n\t\t// circle element\n\t\tsvg.Element.circle = function(node) {\n\t\t\tthis.base = svg.Element.PathElementBase\n\t\t\tthis.base(node)\n\n\t\t\tthis.path = function(ctx) {\n\t\t\t\tconst cx = this.attribute('cx').toPixels('x')\n\t\t\t\tconst cy = this.attribute('cy').toPixels('y')\n\t\t\t\tconst r = this.attribute('r').toPixels()\n\n\t\t\t\tif (ctx != null) {\n\t\t\t\t\tctx.beginPath()\n\t\t\t\t\tctx.arc(cx, cy, r, 0, Math.PI * 2, true)\n\t\t\t\t\tctx.closePath()\n\t\t\t\t}\n\n\t\t\t\treturn new svg.BoundingBox(cx - r, cy - r, cx + r, cy + r)\n\t\t\t}\n\t\t}\n\t\tsvg.Element.circle.prototype = new svg.Element.PathElementBase\n\n\t\t// ellipse element\n\t\tsvg.Element.ellipse = function(node) {\n\t\t\tthis.base = svg.Element.PathElementBase\n\t\t\tthis.base(node)\n\n\t\t\tthis.path = function(ctx) {\n\t\t\t\tconst KAPPA = 4 * ((Math.sqrt(2) - 1) / 3)\n\t\t\t\tconst rx = this.attribute('rx').toPixels('x')\n\t\t\t\tconst ry = this.attribute('ry').toPixels('y')\n\t\t\t\tconst cx = this.attribute('cx').toPixels('x')\n\t\t\t\tconst cy = this.attribute('cy').toPixels('y')\n\n\t\t\t\tif (ctx != null) {\n\t\t\t\t\tctx.beginPath()\n\t\t\t\t\tctx.moveTo(cx, cy - ry)\n\t\t\t\t\tctx.bezierCurveTo(cx + (KAPPA * rx), cy - ry,  cx + rx, cy - (KAPPA * ry), cx + rx, cy)\n\t\t\t\t\tctx.bezierCurveTo(cx + rx, cy + (KAPPA * ry), cx + (KAPPA * rx), cy + ry, cx, cy + ry)\n\t\t\t\t\tctx.bezierCurveTo(cx - (KAPPA * rx), cy + ry, cx - rx, cy + (KAPPA * ry), cx - rx, cy)\n\t\t\t\t\tctx.bezierCurveTo(cx - rx, cy - (KAPPA * ry), cx - (KAPPA * rx), cy - ry, cx, cy - ry)\n\t\t\t\t\tctx.closePath()\n\t\t\t\t}\n\n\t\t\t\treturn new svg.BoundingBox(cx - rx, cy - ry, cx + rx, cy + ry)\n\t\t\t}\n\t\t}\n\t\tsvg.Element.ellipse.prototype = new svg.Element.PathElementBase\n\n\t\t// line element\n\t\tsvg.Element.line = function(node) {\n\t\t\tthis.base = svg.Element.PathElementBase\n\t\t\tthis.base(node)\n\n\t\t\tthis.getPoints = function() {\n\t\t\t\treturn [\n\t\t\t\t\tnew svg.Point(this.attribute('x1').toPixels('x'), this.attribute('y1').toPixels('y')),\n\t\t\t\t\tnew svg.Point(this.attribute('x2').toPixels('x'), this.attribute('y2').toPixels('y'))]\n\t\t\t}\n\n\t\t\tthis.path = function(ctx) {\n\t\t\t\tconst points = this.getPoints()\n\n\t\t\t\tif (ctx != null) {\n\t\t\t\t\tctx.beginPath()\n\t\t\t\t\tctx.moveTo(points[0].x, points[0].y)\n\t\t\t\t\tctx.lineTo(points[1].x, points[1].y)\n\t\t\t\t}\n\n\t\t\t\treturn new svg.BoundingBox(points[0].x, points[0].y, points[1].x, points[1].y)\n\t\t\t}\n\n\t\t\tthis.getMarkers = function() {\n\t\t\t\tconst points = this.getPoints()\n\t\t\t\tconst a = points[0].angleTo(points[1])\n\t\t\t\treturn [[points[0], a], [points[1], a]]\n\t\t\t}\n\t\t}\n\t\tsvg.Element.line.prototype = new svg.Element.PathElementBase\n\n\t\t// polyline element\n\t\tsvg.Element.polyline = function(node) {\n\t\t\tthis.base = svg.Element.PathElementBase\n\t\t\tthis.base(node)\n\n\t\t\tthis.points = svg.CreatePath(this.attribute('points').value)\n\t\t\tthis.path = function(ctx) {\n\t\t\t\tconst bb = new svg.BoundingBox(this.points[0].x, this.points[0].y)\n\t\t\t\tif (ctx != null) {\n\t\t\t\t\tctx.beginPath()\n\t\t\t\t\tctx.moveTo(this.points[0].x, this.points[0].y)\n\t\t\t\t}\n\t\t\t\tfor (let i=1; i<this.points.length; i++) {\n\t\t\t\t\tbb.addPoint(this.points[i].x, this.points[i].y)\n\t\t\t\t\tif (ctx != null) ctx.lineTo(this.points[i].x, this.points[i].y)\n\t\t\t\t}\n\t\t\t\treturn bb\n\t\t\t}\n\n\t\t\tthis.getMarkers = function() {\n\t\t\t\tconst markers = []\n\t\t\t\tfor (let i=0; i<this.points.length - 1; i++) {\n\t\t\t\t\tmarkers.push([this.points[i], this.points[i].angleTo(this.points[i+1])])\n\t\t\t\t}\n\t\t\t\tif (markers.length > 0) {\n\t\t\t\t\tmarkers.push([this.points[this.points.length-1], markers[markers.length-1][1]])\n\t\t\t\t}\n\t\t\t\treturn markers\n\t\t\t}\n\t\t}\n\t\tsvg.Element.polyline.prototype = new svg.Element.PathElementBase\n\n\t\t// polygon element\n\t\tsvg.Element.polygon = function(node) {\n\t\t\tthis.base = svg.Element.polyline\n\t\t\tthis.base(node)\n\n\t\t\tthis.basePath = this.path\n\t\t\tthis.path = function(ctx) {\n\t\t\t\tconst bb = this.basePath(ctx)\n\t\t\t\tif (ctx != null) {\n\t\t\t\t\tctx.lineTo(this.points[0].x, this.points[0].y)\n\t\t\t\t\tctx.closePath()\n\t\t\t\t}\n\t\t\t\treturn bb\n\t\t\t}\n\t\t}\n\t\tsvg.Element.polygon.prototype = new svg.Element.polyline\n\n\t\t// path element\n\t\tsvg.Element.path = function(node) {\n\t\t\tthis.base = svg.Element.PathElementBase\n\t\t\tthis.base(node)\n\n\t\t\tlet d = this.attribute('d').value\n\t\t\t// TODO: convert to real lexer based on http://www.w3.org/TR/SVG11/paths.html#PathDataBNF\n\t\t\td = d.replace(/,/gm,' ') // get rid of all commas\n\t\t\t// As the end of a match can also be the start of the next match, we need to run this replace twice.\n\t\t\tfor(var i=0; i<2; i++)\n\t\t\t\td = d.replace(/([MmZzLlHhVvCcSsQqTtAa])([^\\s])/gm,'$1 $2') // suffix commands with spaces\n\t\t\td = d.replace(/([^\\s])([MmZzLlHhVvCcSsQqTtAa])/gm,'$1 $2') // prefix commands with spaces\n\t\t\td = d.replace(/([0-9])([+\\-])/gm,'$1 $2') // separate digits on +- signs\n\t\t\t// Again, we need to run this twice to find all occurances\n\t\t\tfor(var i=0; i<2; i++)\n\t\t\t\td = d.replace(/(\\.[0-9]*)(\\.)/gm,'$1 $2') // separate digits when they start with a comma\n\t\t\td = d.replace(/([Aa](\\s+[0-9]+){3})\\s+([01])\\s*([01])/gm,'$1 $3 $4 ') // shorthand elliptical arc path syntax\n\t\t\td = svg.compressSpaces(d) // compress multiple spaces\n\t\t\td = svg.trim(d)\n\t\t\tthis.PathParser = new (function(d) {\n\t\t\t\tthis.tokens = d.split(' ')\n\n\t\t\t\tthis.reset = function() {\n\t\t\t\t\tthis.i = -1\n\t\t\t\t\tthis.command = ''\n\t\t\t\t\tthis.previousCommand = ''\n\t\t\t\t\tthis.start = new svg.Point(0, 0)\n\t\t\t\t\tthis.control = new svg.Point(0, 0)\n\t\t\t\t\tthis.current = new svg.Point(0, 0)\n\t\t\t\t\tthis.points = []\n\t\t\t\t\tthis.angles = []\n\t\t\t\t}\n\n\t\t\t\tthis.isEnd = function() {\n\t\t\t\t\treturn this.i >= this.tokens.length - 1\n\t\t\t\t}\n\n\t\t\t\tthis.isCommandOrEnd = function() {\n\t\t\t\t\tif (this.isEnd()) return true\n\t\t\t\t\treturn this.tokens[this.i + 1].match(/^[A-Za-z]$/) != null\n\t\t\t\t}\n\n\t\t\t\tthis.isRelativeCommand = function() {\n\t\t\t\t\tswitch(this.command)\n\t\t\t\t\t{\n\t\t\t\t\t\tcase 'm':\n\t\t\t\t\t\tcase 'l':\n\t\t\t\t\t\tcase 'h':\n\t\t\t\t\t\tcase 'v':\n\t\t\t\t\t\tcase 'c':\n\t\t\t\t\t\tcase 's':\n\t\t\t\t\t\tcase 'q':\n\t\t\t\t\t\tcase 't':\n\t\t\t\t\t\tcase 'a':\n\t\t\t\t\t\tcase 'z':\n\t\t\t\t\t\t\treturn true\n\t\t\t\t\t\t\tbreak\n\t\t\t\t\t}\n\t\t\t\t\treturn false\n\t\t\t\t}\n\n\t\t\t\tthis.getToken = function() {\n\t\t\t\t\tthis.i++\n\t\t\t\t\treturn this.tokens[this.i]\n\t\t\t\t}\n\n\t\t\t\tthis.getScalar = function() {\n\t\t\t\t\treturn parseFloat(this.getToken())\n\t\t\t\t}\n\n\t\t\t\tthis.nextCommand = function() {\n\t\t\t\t\tthis.previousCommand = this.command\n\t\t\t\t\tthis.command = this.getToken()\n\t\t\t\t}\n\n\t\t\t\tthis.getPoint = function() {\n\t\t\t\t\tconst p = new svg.Point(this.getScalar(), this.getScalar())\n\t\t\t\t\treturn this.makeAbsolute(p)\n\t\t\t\t}\n\n\t\t\t\tthis.getAsControlPoint = function() {\n\t\t\t\t\tconst p = this.getPoint()\n\t\t\t\t\tthis.control = p\n\t\t\t\t\treturn p\n\t\t\t\t}\n\n\t\t\t\tthis.getAsCurrentPoint = function() {\n\t\t\t\t\tconst p = this.getPoint()\n\t\t\t\t\tthis.current = p\n\t\t\t\t\treturn p\n\t\t\t\t}\n\n\t\t\t\tthis.getReflectedControlPoint = function() {\n\t\t\t\t\tif (this.previousCommand.toLowerCase() != 'c' &&\n\t\t\t\t\t    this.previousCommand.toLowerCase() != 's' &&\n\t\t\t\t\t\tthis.previousCommand.toLowerCase() != 'q' &&\n\t\t\t\t\t\tthis.previousCommand.toLowerCase() != 't' ){\n\t\t\t\t\t\treturn this.current\n\t\t\t\t\t}\n\n\t\t\t\t\t// reflect point\n\t\t\t\t\tconst p = new svg.Point(2 * this.current.x - this.control.x, 2 * this.current.y - this.control.y)\n\t\t\t\t\treturn p\n\t\t\t\t}\n\n\t\t\t\tthis.makeAbsolute = function(p) {\n\t\t\t\t\tif (this.isRelativeCommand()) {\n\t\t\t\t\t\tp.x += this.current.x\n\t\t\t\t\t\tp.y += this.current.y\n\t\t\t\t\t}\n\t\t\t\t\treturn p\n\t\t\t\t}\n\n\t\t\t\tthis.addMarker = function(p, from, priorTo) {\n\t\t\t\t\t// if the last angle isn't filled in because we didn't have this point yet ...\n\t\t\t\t\tif (priorTo != null && this.angles.length > 0 && this.angles[this.angles.length-1] == null) {\n\t\t\t\t\t\tthis.angles[this.angles.length-1] = this.points[this.points.length-1].angleTo(priorTo)\n\t\t\t\t\t}\n\t\t\t\t\tthis.addMarkerAngle(p, from == null ? null : from.angleTo(p))\n\t\t\t\t}\n\n\t\t\t\tthis.addMarkerAngle = function(p, a) {\n\t\t\t\t\tthis.points.push(p)\n\t\t\t\t\tthis.angles.push(a)\n\t\t\t\t}\n\n\t\t\t\tthis.getMarkerPoints = function() { return this.points }\n\t\t\t\tthis.getMarkerAngles = function() {\n\t\t\t\t\tfor (let i=0; i<this.angles.length; i++) {\n\t\t\t\t\t\tif (this.angles[i] == null) {\n\t\t\t\t\t\t\tfor (let j=i+1; j<this.angles.length; j++) {\n\t\t\t\t\t\t\t\tif (this.angles[j] != null) {\n\t\t\t\t\t\t\t\t\tthis.angles[i] = this.angles[j]\n\t\t\t\t\t\t\t\t\tbreak\n\t\t\t\t\t\t\t\t}\n\t\t\t\t\t\t\t}\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\t\t\t\t\treturn this.angles\n\t\t\t\t}\n\t\t\t})(d)\n\n\t\t\tthis.path = function(ctx) {\n\t\t\t\tconst pp = this.PathParser\n\t\t\t\tpp.reset()\n\n\t\t\t\tconst bb = new svg.BoundingBox()\n\t\t\t\tif (ctx != null) ctx.beginPath()\n\t\t\t\twhile (!pp.isEnd()) {\n\t\t\t\t\tpp.nextCommand()\n\t\t\t\t\tswitch (pp.command) {\n\t\t\t\t\tcase 'M':\n\t\t\t\t\tcase 'm':\n\t\t\t\t\t\tvar p = pp.getAsCurrentPoint()\n\t\t\t\t\t\tpp.addMarker(p)\n\t\t\t\t\t\tbb.addPoint(p.x, p.y)\n\t\t\t\t\t\tif (ctx != null) ctx.moveTo(p.x, p.y)\n\t\t\t\t\t\tpp.start = pp.current\n\t\t\t\t\t\twhile (!pp.isCommandOrEnd()) {\n\t\t\t\t\t\t\tvar p = pp.getAsCurrentPoint()\n\t\t\t\t\t\t\tpp.addMarker(p, pp.start)\n\t\t\t\t\t\t\tbb.addPoint(p.x, p.y)\n\t\t\t\t\t\t\tif (ctx != null) ctx.lineTo(p.x, p.y)\n\t\t\t\t\t\t}\n\t\t\t\t\t\tbreak\n\t\t\t\t\tcase 'L':\n\t\t\t\t\tcase 'l':\n\t\t\t\t\t\twhile (!pp.isCommandOrEnd()) {\n\t\t\t\t\t\t\tconst c = pp.current\n\t\t\t\t\t\t\tvar p = pp.getAsCurrentPoint()\n\t\t\t\t\t\t\tpp.addMarker(p, c)\n\t\t\t\t\t\t\tbb.addPoint(p.x, p.y)\n\t\t\t\t\t\t\tif (ctx != null) ctx.lineTo(p.x, p.y)\n\t\t\t\t\t\t}\n\t\t\t\t\t\tbreak\n\t\t\t\t\tcase 'H':\n\t\t\t\t\tcase 'h':\n\t\t\t\t\t\twhile (!pp.isCommandOrEnd()) {\n\t\t\t\t\t\t\tvar newP = new svg.Point((pp.isRelativeCommand() ? pp.current.x : 0) + pp.getScalar(), pp.current.y)\n\t\t\t\t\t\t\tpp.addMarker(newP, pp.current)\n\t\t\t\t\t\t\tpp.current = newP\n\t\t\t\t\t\t\tbb.addPoint(pp.current.x, pp.current.y)\n\t\t\t\t\t\t\tif (ctx != null) ctx.lineTo(pp.current.x, pp.current.y)\n\t\t\t\t\t\t}\n\t\t\t\t\t\tbreak\n\t\t\t\t\tcase 'V':\n\t\t\t\t\tcase 'v':\n\t\t\t\t\t\twhile (!pp.isCommandOrEnd()) {\n\t\t\t\t\t\t\tvar newP = new svg.Point(pp.current.x, (pp.isRelativeCommand() ? pp.current.y : 0) + pp.getScalar())\n\t\t\t\t\t\t\tpp.addMarker(newP, pp.current)\n\t\t\t\t\t\t\tpp.current = newP\n\t\t\t\t\t\t\tbb.addPoint(pp.current.x, pp.current.y)\n\t\t\t\t\t\t\tif (ctx != null) ctx.lineTo(pp.current.x, pp.current.y)\n\t\t\t\t\t\t}\n\t\t\t\t\t\tbreak\n\t\t\t\t\tcase 'C':\n\t\t\t\t\tcase 'c':\n\t\t\t\t\t\twhile (!pp.isCommandOrEnd()) {\n\t\t\t\t\t\t\tvar curr = pp.current\n\t\t\t\t\t\t\tvar p1 = pp.getPoint()\n\t\t\t\t\t\t\tvar cntrl = pp.getAsControlPoint()\n\t\t\t\t\t\t\tvar cp = pp.getAsCurrentPoint()\n\t\t\t\t\t\t\tpp.addMarker(cp, cntrl, p1)\n\t\t\t\t\t\t\tbb.addBezierCurve(curr.x, curr.y, p1.x, p1.y, cntrl.x, cntrl.y, cp.x, cp.y)\n\t\t\t\t\t\t\tif (ctx != null) ctx.bezierCurveTo(p1.x, p1.y, cntrl.x, cntrl.y, cp.x, cp.y)\n\t\t\t\t\t\t}\n\t\t\t\t\t\tbreak\n\t\t\t\t\tcase 'S':\n\t\t\t\t\tcase 's':\n\t\t\t\t\t\twhile (!pp.isCommandOrEnd()) {\n\t\t\t\t\t\t\tvar curr = pp.current\n\t\t\t\t\t\t\tvar p1 = pp.getReflectedControlPoint()\n\t\t\t\t\t\t\tvar cntrl = pp.getAsControlPoint()\n\t\t\t\t\t\t\tvar cp = pp.getAsCurrentPoint()\n\t\t\t\t\t\t\tpp.addMarker(cp, cntrl, p1)\n\t\t\t\t\t\t\tbb.addBezierCurve(curr.x, curr.y, p1.x, p1.y, cntrl.x, cntrl.y, cp.x, cp.y)\n\t\t\t\t\t\t\tif (ctx != null) ctx.bezierCurveTo(p1.x, p1.y, cntrl.x, cntrl.y, cp.x, cp.y)\n\t\t\t\t\t\t}\n\t\t\t\t\t\tbreak\n\t\t\t\t\tcase 'Q':\n\t\t\t\t\tcase 'q':\n\t\t\t\t\t\twhile (!pp.isCommandOrEnd()) {\n\t\t\t\t\t\t\tvar curr = pp.current\n\t\t\t\t\t\t\tvar cntrl = pp.getAsControlPoint()\n\t\t\t\t\t\t\tvar cp = pp.getAsCurrentPoint()\n\t\t\t\t\t\t\tpp.addMarker(cp, cntrl, cntrl)\n\t\t\t\t\t\t\tbb.addQuadraticCurve(curr.x, curr.y, cntrl.x, cntrl.y, cp.x, cp.y)\n\t\t\t\t\t\t\tif (ctx != null) ctx.quadraticCurveTo(cntrl.x, cntrl.y, cp.x, cp.y)\n\t\t\t\t\t\t}\n\t\t\t\t\t\tbreak\n\t\t\t\t\tcase 'T':\n\t\t\t\t\tcase 't':\n\t\t\t\t\t\twhile (!pp.isCommandOrEnd()) {\n\t\t\t\t\t\t\tvar curr = pp.current\n\t\t\t\t\t\t\tvar cntrl = pp.getReflectedControlPoint()\n\t\t\t\t\t\t\tpp.control = cntrl\n\t\t\t\t\t\t\tvar cp = pp.getAsCurrentPoint()\n\t\t\t\t\t\t\tpp.addMarker(cp, cntrl, cntrl)\n\t\t\t\t\t\t\tbb.addQuadraticCurve(curr.x, curr.y, cntrl.x, cntrl.y, cp.x, cp.y)\n\t\t\t\t\t\t\tif (ctx != null) ctx.quadraticCurveTo(cntrl.x, cntrl.y, cp.x, cp.y)\n\t\t\t\t\t\t}\n\t\t\t\t\t\tbreak\n\t\t\t\t\tcase 'A':\n\t\t\t\t\tcase 'a':\n\t\t\t\t\t\twhile (!pp.isCommandOrEnd()) {\n\t\t\t\t\t\t    var curr = pp.current\n\t\t\t\t\t\t\tlet rx = pp.getScalar()\n\t\t\t\t\t\t\tlet ry = pp.getScalar()\n\t\t\t\t\t\t\tconst xAxisRotation = pp.getScalar() * (Math.PI / 180.0)\n\t\t\t\t\t\t\tconst largeArcFlag = pp.getScalar()\n\t\t\t\t\t\t\tconst sweepFlag = pp.getScalar()\n\t\t\t\t\t\t\tvar cp = pp.getAsCurrentPoint()\n\n\t\t\t\t\t\t\t// Conversion from endpoint to center parameterization\n\t\t\t\t\t\t\t// http://www.w3.org/TR/SVG11/implnote.html#ArcImplementationNotes\n\t\t\t\t\t\t\t// x1', y1'\n\t\t\t\t\t\t\tconst currp = new svg.Point(\n\t\t\t\t\t\t\t\tMath.cos(xAxisRotation) * (curr.x - cp.x) / 2.0 + Math.sin(xAxisRotation) * (curr.y - cp.y) / 2.0,\n\t\t\t\t\t\t\t\t-Math.sin(xAxisRotation) * (curr.x - cp.x) / 2.0 + Math.cos(xAxisRotation) * (curr.y - cp.y) / 2.0\n\t\t\t\t\t\t\t)\n\t\t\t\t\t\t\t// adjust radii\n\t\t\t\t\t\t\tconst l = Math.pow(currp.x,2)/Math.pow(rx,2)+Math.pow(currp.y,2)/Math.pow(ry,2)\n\t\t\t\t\t\t\tif (l > 1) {\n\t\t\t\t\t\t\t\trx *= Math.sqrt(l)\n\t\t\t\t\t\t\t\try *= Math.sqrt(l)\n\t\t\t\t\t\t\t}\n\t\t\t\t\t\t\t// cx', cy'\n\t\t\t\t\t\t\tlet s = (largeArcFlag == sweepFlag ? -1 : 1) * Math.sqrt(\n\t\t\t\t\t\t\t\t((Math.pow(rx,2)*Math.pow(ry,2))-(Math.pow(rx,2)*Math.pow(currp.y,2))-(Math.pow(ry,2)*Math.pow(currp.x,2))) /\n\t\t\t\t\t\t\t\t(Math.pow(rx,2)*Math.pow(currp.y,2)+Math.pow(ry,2)*Math.pow(currp.x,2))\n\t\t\t\t\t\t\t)\n\t\t\t\t\t\t\tif (isNaN(s)) s = 0\n\t\t\t\t\t\t\tconst cpp = new svg.Point(s * rx * currp.y / ry, s * -ry * currp.x / rx)\n\t\t\t\t\t\t\t// cx, cy\n\t\t\t\t\t\t\tconst centp = new svg.Point(\n\t\t\t\t\t\t\t\t(curr.x + cp.x) / 2.0 + Math.cos(xAxisRotation) * cpp.x - Math.sin(xAxisRotation) * cpp.y,\n\t\t\t\t\t\t\t\t(curr.y + cp.y) / 2.0 + Math.sin(xAxisRotation) * cpp.x + Math.cos(xAxisRotation) * cpp.y\n\t\t\t\t\t\t\t)\n\t\t\t\t\t\t\t// vector magnitude\n\t\t\t\t\t\t\tvar m = function(v) { return Math.sqrt(Math.pow(v[0],2) + Math.pow(v[1],2)) }\n\t\t\t\t\t\t\t// ratio between two vectors\n\t\t\t\t\t\t\tvar r = function(u, v) { return (u[0]*v[0]+u[1]*v[1]) / (m(u)*m(v)) }\n\t\t\t\t\t\t\t// angle between two vectors\n\t\t\t\t\t\t\tconst a = function(u, v) { return (u[0]*v[1] < u[1]*v[0] ? -1 : 1) * Math.acos(r(u,v)) }\n\t\t\t\t\t\t\t// initial angle\n\t\t\t\t\t\t\tconst a1 = a([1,0], [(currp.x-cpp.x)/rx,(currp.y-cpp.y)/ry])\n\t\t\t\t\t\t\t// angle delta\n\t\t\t\t\t\t\tconst u = [(currp.x-cpp.x)/rx,(currp.y-cpp.y)/ry]\n\t\t\t\t\t\t\tconst v = [(-currp.x-cpp.x)/rx,(-currp.y-cpp.y)/ry]\n\t\t\t\t\t\t\tlet ad = a(u, v)\n\t\t\t\t\t\t\tif (r(u,v) <= -1) ad = Math.PI\n\t\t\t\t\t\t\tif (r(u,v) >= 1) ad = 0\n\n\t\t\t\t\t\t\t// for markers\n\t\t\t\t\t\t\tconst dir = 1 - sweepFlag ? 1.0 : -1.0\n\t\t\t\t\t\t\tconst ah = a1 + dir * (ad / 2.0)\n\t\t\t\t\t\t\tconst halfWay = new svg.Point(\n\t\t\t\t\t\t\t\tcentp.x + rx * Math.cos(ah),\n\t\t\t\t\t\t\t\tcentp.y + ry * Math.sin(ah)\n\t\t\t\t\t\t\t)\n\t\t\t\t\t\t\tpp.addMarkerAngle(halfWay, ah - dir * Math.PI / 2)\n\t\t\t\t\t\t\tpp.addMarkerAngle(cp, ah - dir * Math.PI)\n\n\t\t\t\t\t\t\tbb.addPoint(cp.x, cp.y) // TODO: this is too naive, make it better\n\t\t\t\t\t\t\tif (ctx != null) {\n\t\t\t\t\t\t\t\tvar r = rx > ry ? rx : ry\n\t\t\t\t\t\t\t\tconst sx = rx > ry ? 1 : rx / ry\n\t\t\t\t\t\t\t\tconst sy = rx > ry ? ry / rx : 1\n\n\t\t\t\t\t\t\t\tctx.translate(centp.x, centp.y)\n\t\t\t\t\t\t\t\tctx.rotate(xAxisRotation)\n\t\t\t\t\t\t\t\tctx.scale(sx, sy)\n\t\t\t\t\t\t\t\tctx.arc(0, 0, r, a1, a1 + ad, 1 - sweepFlag)\n\t\t\t\t\t\t\t\tctx.scale(1/sx, 1/sy)\n\t\t\t\t\t\t\t\tctx.rotate(-xAxisRotation)\n\t\t\t\t\t\t\t\tctx.translate(-centp.x, -centp.y)\n\t\t\t\t\t\t\t}\n\t\t\t\t\t\t}\n\t\t\t\t\t\tbreak\n\t\t\t\t\tcase 'Z':\n\t\t\t\t\tcase 'z':\n\t\t\t\t\t\tif (ctx != null) ctx.closePath()\n\t\t\t\t\t\tpp.current = pp.start\n\t\t\t\t\t}\n\t\t\t\t}\n\n\t\t\t\treturn bb\n\t\t\t}\n\n\t\t\tthis.getMarkers = function() {\n\t\t\t\tconst points = this.PathParser.getMarkerPoints()\n\t\t\t\tconst angles = this.PathParser.getMarkerAngles()\n\n\t\t\t\tconst markers = []\n\t\t\t\tfor (let i=0; i<points.length; i++) {\n\t\t\t\t\tmarkers.push([points[i], angles[i]])\n\t\t\t\t}\n\t\t\t\treturn markers\n\t\t\t}\n\t\t}\n\t\tsvg.Element.path.prototype = new svg.Element.PathElementBase\n\n\t\t// pattern element\n\t\tsvg.Element.pattern = function(node) {\n\t\t\tthis.base = svg.Element.ElementBase\n\t\t\tthis.base(node)\n\n\t\t\tthis.createPattern = function(ctx, element) {\n\t\t\t\tconst width = this.attribute('width').toPixels('x', true)\n\t\t\t\tconst height = this.attribute('height').toPixels('y', true)\n\n\t\t\t\t// render me using a temporary svg element\n\t\t\t\tconst tempSvg = new svg.Element.svg()\n\t\t\t\ttempSvg.attributes.viewBox = new svg.Property('viewBox', this.attribute('viewBox').value)\n\t\t\t\ttempSvg.attributes.width = new svg.Property('width', `${width  }px`)\n\t\t\t\ttempSvg.attributes.height = new svg.Property('height', `${height  }px`)\n\t\t\t\ttempSvg.attributes.transform = new svg.Property('transform', this.attribute('patternTransform').value)\n\t\t\t\ttempSvg.children = this.children\n\n\t\t\t\tconst c = document.createElement('canvas')\n\t\t\t\tc.width = width\n\t\t\t\tc.height = height\n\t\t\t\tconst cctx = c.getContext('2d')\n\t\t\t\tif (this.attribute('x').hasValue() && this.attribute('y').hasValue()) {\n\t\t\t\t\tcctx.translate(this.attribute('x').toPixels('x', true), this.attribute('y').toPixels('y', true))\n\t\t\t\t}\n\t\t\t\t// render 3x3 grid so when we transform there's no white space on edges\n\t\t\t\tfor (let x=-1; x<=1; x++) {\n\t\t\t\t\tfor (let y=-1; y<=1; y++) {\n\t\t\t\t\t\tcctx.save()\n\t\t\t\t\t\ttempSvg.attributes.x = new svg.Property('x', x * c.width)\n\t\t\t\t\t\ttempSvg.attributes.y = new svg.Property('y', y * c.height)\n\t\t\t\t\t\ttempSvg.render(cctx)\n\t\t\t\t\t\tcctx.restore()\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t\tconst pattern = ctx.createPattern(c, 'repeat')\n\t\t\t\treturn pattern\n\t\t\t}\n\t\t}\n\t\tsvg.Element.pattern.prototype = new svg.Element.ElementBase\n\n\t\t// marker element\n\t\tsvg.Element.marker = function(node) {\n\t\t\tthis.base = svg.Element.ElementBase\n\t\t\tthis.base(node)\n\n\t\t\tthis.baseRender = this.render\n\t\t\tthis.render = function(ctx, point, angle) {\n\t\t\t\tctx.translate(point.x, point.y)\n\t\t\t\tif (this.attribute('orient').valueOrDefault('auto') == 'auto') ctx.rotate(angle)\n\t\t\t\tif (this.attribute('markerUnits').valueOrDefault('strokeWidth') == 'strokeWidth') ctx.scale(ctx.lineWidth, ctx.lineWidth)\n\t\t\t\tctx.save()\n\n\t\t\t\t// render me using a temporary svg element\n\t\t\t\tconst tempSvg = new svg.Element.svg()\n\t\t\t\ttempSvg.attributes.viewBox = new svg.Property('viewBox', this.attribute('viewBox').value)\n\t\t\t\ttempSvg.attributes.refX = new svg.Property('refX', this.attribute('refX').value)\n\t\t\t\ttempSvg.attributes.refY = new svg.Property('refY', this.attribute('refY').value)\n\t\t\t\ttempSvg.attributes.width = new svg.Property('width', this.attribute('markerWidth').value)\n\t\t\t\ttempSvg.attributes.height = new svg.Property('height', this.attribute('markerHeight').value)\n\t\t\t\ttempSvg.attributes.fill = new svg.Property('fill', this.attribute('fill').valueOrDefault('black'))\n\t\t\t\ttempSvg.attributes.stroke = new svg.Property('stroke', this.attribute('stroke').valueOrDefault('none'))\n\t\t\t\ttempSvg.children = this.children\n\t\t\t\ttempSvg.render(ctx)\n\n\t\t\t\tctx.restore()\n\t\t\t\tif (this.attribute('markerUnits').valueOrDefault('strokeWidth') == 'strokeWidth') ctx.scale(1/ctx.lineWidth, 1/ctx.lineWidth)\n\t\t\t\tif (this.attribute('orient').valueOrDefault('auto') == 'auto') ctx.rotate(-angle)\n\t\t\t\tctx.translate(-point.x, -point.y)\n\t\t\t}\n\t\t}\n\t\tsvg.Element.marker.prototype = new svg.Element.ElementBase\n\n\t\t// definitions element\n\t\tsvg.Element.defs = function(node) {\n\t\t\tthis.base = svg.Element.ElementBase\n\t\t\tthis.base(node)\n\n\t\t\tthis.render = function(ctx) {\n\t\t\t\t// NOOP\n\t\t\t}\n\t\t}\n\t\tsvg.Element.defs.prototype = new svg.Element.ElementBase\n\n\t\t// base for gradients\n\t\tsvg.Element.GradientBase = function(node) {\n\t\t\tthis.base = svg.Element.ElementBase\n\t\t\tthis.base(node)\n\n\t\t\tthis.stops = []\n\t\t\tfor (let i=0; i<this.children.length; i++) {\n\t\t\t\tconst child = this.children[i]\n\t\t\t\tif (child.type == 'stop') this.stops.push(child)\n\t\t\t}\n\n\t\t\tthis.getGradient = function() {\n\t\t\t\t// OVERRIDE ME!\n\t\t\t}\n\t\t\t\n\t\t\tthis.gradientUnits = function () {\n\t\t\t\treturn this.attribute('gradientUnits').valueOrDefault('objectBoundingBox')\n\t\t\t}\n\t\t\t\n\t\t\tthis.attributesToInherit = ['gradientUnits']\n\t\t\t\n\t\t\tthis.inheritStopContainer = function (stopsContainer) {\n\t\t\t\tfor (let i=0; i<this.attributesToInherit.length; i++) {\n\t\t\t\t\tconst attributeToInherit = this.attributesToInherit[i]\n\t\t\t\t\tif (!this.attribute(attributeToInherit).hasValue() && stopsContainer.attribute(attributeToInherit).hasValue()) {\n\t\t\t\t\t\tthis.attribute(attributeToInherit, true).value = stopsContainer.attribute(attributeToInherit).value\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tthis.createGradient = function(ctx, element, parentOpacityProp) {\n\t\t\t\tlet stopsContainer = this\n\t\t\t\tif (this.getHrefAttribute().hasValue()) {\n\t\t\t\t\tstopsContainer = this.getHrefAttribute().getDefinition()\n\t\t\t\t\tthis.inheritStopContainer(stopsContainer)\n\t\t\t\t}\n\n\t\t\t\tconst addParentOpacity = function (color) {\n\t\t\t\t\tif (parentOpacityProp.hasValue()) {\n\t\t\t\t\t\tconst p = new svg.Property('color', color)\n\t\t\t\t\t\treturn p.addOpacity(parentOpacityProp).value\n\t\t\t\t\t}\n\t\t\t\t\treturn color\n\t\t\t\t}\n\n\t\t\t\tconst g = this.getGradient(ctx, element)\n\t\t\t\tif (g == null) return addParentOpacity(stopsContainer.stops[stopsContainer.stops.length - 1].color)\n\t\t\t\tfor (let i=0; i<stopsContainer.stops.length; i++) {\n\t\t\t\t\tg.addColorStop(stopsContainer.stops[i].offset, addParentOpacity(stopsContainer.stops[i].color))\n\t\t\t\t}\n\n\t\t\t\tif (this.attribute('gradientTransform').hasValue()) {\n\t\t\t\t\t// render as transformed pattern on temporary canvas\n\t\t\t\t\tconst rootView = svg.ViewPort.viewPorts[0]\n\n\t\t\t\t\tconst rect = new svg.Element.rect()\n\t\t\t\t\trect.attributes.x = new svg.Property('x', -svg.MAX_VIRTUAL_PIXELS/3.0)\n\t\t\t\t\trect.attributes.y = new svg.Property('y', -svg.MAX_VIRTUAL_PIXELS/3.0)\n\t\t\t\t\trect.attributes.width = new svg.Property('width', svg.MAX_VIRTUAL_PIXELS)\n\t\t\t\t\trect.attributes.height = new svg.Property('height', svg.MAX_VIRTUAL_PIXELS)\n\n\t\t\t\t\tconst group = new svg.Element.g()\n\t\t\t\t\tgroup.attributes.transform = new svg.Property('transform', this.attribute('gradientTransform').value)\n\t\t\t\t\tgroup.children = [ rect ]\n\n\t\t\t\t\tconst tempSvg = new svg.Element.svg()\n\t\t\t\t\ttempSvg.attributes.x = new svg.Property('x', 0)\n\t\t\t\t\ttempSvg.attributes.y = new svg.Property('y', 0)\n\t\t\t\t\ttempSvg.attributes.width = new svg.Property('width', rootView.width)\n\t\t\t\t\ttempSvg.attributes.height = new svg.Property('height', rootView.height)\n\t\t\t\t\ttempSvg.children = [ group ]\n\n\t\t\t\t\tconst c = document.createElement('canvas')\n\t\t\t\t\tc.width = rootView.width\n\t\t\t\t\tc.height = rootView.height\n\t\t\t\t\tconst tempCtx = c.getContext('2d')\n\t\t\t\t\ttempCtx.fillStyle = g\n\t\t\t\t\ttempSvg.render(tempCtx)\n\t\t\t\t\treturn tempCtx.createPattern(c, 'no-repeat')\n\t\t\t\t}\n\n\t\t\t\treturn g\n\t\t\t}\n\t\t}\n\t\tsvg.Element.GradientBase.prototype = new svg.Element.ElementBase\n\n\t\t// linear gradient element\n\t\tsvg.Element.linearGradient = function(node) {\n\t\t\tthis.base = svg.Element.GradientBase\n\t\t\tthis.base(node)\n\t\t\t\n\t\t\tthis.attributesToInherit.push('x1')\n\t\t\tthis.attributesToInherit.push('y1')\n\t\t\tthis.attributesToInherit.push('x2')\n\t\t\tthis.attributesToInherit.push('y2')\n\n\t\t\tthis.getGradient = function(ctx, element) {\n\t\t\t\tconst bb = this.gradientUnits() == 'objectBoundingBox' ? element.getBoundingBox() : null\n\n\t\t\t\tif (!this.attribute('x1').hasValue()\n\t\t\t\t && !this.attribute('y1').hasValue()\n\t\t\t\t && !this.attribute('x2').hasValue()\n\t\t\t\t && !this.attribute('y2').hasValue()) {\n\t\t\t\t\tthis.attribute('x1', true).value = 0\n\t\t\t\t\tthis.attribute('y1', true).value = 0\n\t\t\t\t\tthis.attribute('x2', true).value = 1\n\t\t\t\t\tthis.attribute('y2', true).value = 0\n\t\t\t\t }\n\n\t\t\t\tconst x1 = (this.gradientUnits() == 'objectBoundingBox'\n\t\t\t\t\t? bb.x() + bb.width() * this.attribute('x1').numValue()\n\t\t\t\t\t: this.attribute('x1').toPixels('x'))\n\t\t\t\tconst y1 = (this.gradientUnits() == 'objectBoundingBox'\n\t\t\t\t\t? bb.y() + bb.height() * this.attribute('y1').numValue()\n\t\t\t\t\t: this.attribute('y1').toPixels('y'))\n\t\t\t\tconst x2 = (this.gradientUnits() == 'objectBoundingBox'\n\t\t\t\t\t? bb.x() + bb.width() * this.attribute('x2').numValue()\n\t\t\t\t\t: this.attribute('x2').toPixels('x'))\n\t\t\t\tconst y2 = (this.gradientUnits() == 'objectBoundingBox'\n\t\t\t\t\t? bb.y() + bb.height() * this.attribute('y2').numValue()\n\t\t\t\t\t: this.attribute('y2').toPixels('y'))\n\n\t\t\t\tif (x1 == x2 && y1 == y2) return null\n\t\t\t\treturn ctx.createLinearGradient(x1, y1, x2, y2)\n\t\t\t}\n\t\t}\n\t\tsvg.Element.linearGradient.prototype = new svg.Element.GradientBase\n\n\t\t// radial gradient element\n\t\tsvg.Element.radialGradient = function(node) {\n\t\t\tthis.base = svg.Element.GradientBase\n\t\t\tthis.base(node)\n\t\t\t\n\t\t\tthis.attributesToInherit.push('cx')\n\t\t\tthis.attributesToInherit.push('cy')\n\t\t\tthis.attributesToInherit.push('r')\n\t\t\tthis.attributesToInherit.push('fx')\n\t\t\tthis.attributesToInherit.push('fy')\n\n\t\t\tthis.getGradient = function(ctx, element) {\n\t\t\t\tconst bb = element.getBoundingBox()\n\n\t\t\t\tif (!this.attribute('cx').hasValue()) this.attribute('cx', true).value = '50%'\n\t\t\t\tif (!this.attribute('cy').hasValue()) this.attribute('cy', true).value = '50%'\n\t\t\t\tif (!this.attribute('r').hasValue()) this.attribute('r', true).value = '50%'\n\n\t\t\t\tconst cx = (this.gradientUnits() == 'objectBoundingBox'\n\t\t\t\t\t? bb.x() + bb.width() * this.attribute('cx').numValue()\n\t\t\t\t\t: this.attribute('cx').toPixels('x'))\n\t\t\t\tconst cy = (this.gradientUnits() == 'objectBoundingBox'\n\t\t\t\t\t? bb.y() + bb.height() * this.attribute('cy').numValue()\n\t\t\t\t\t: this.attribute('cy').toPixels('y'))\n\n\t\t\t\tlet fx = cx\n\t\t\t\tlet fy = cy\n\t\t\t\tif (this.attribute('fx').hasValue()) {\n\t\t\t\t\tfx = (this.gradientUnits() == 'objectBoundingBox'\n\t\t\t\t\t? bb.x() + bb.width() * this.attribute('fx').numValue()\n\t\t\t\t\t: this.attribute('fx').toPixels('x'))\n\t\t\t\t}\n\t\t\t\tif (this.attribute('fy').hasValue()) {\n\t\t\t\t\tfy = (this.gradientUnits() == 'objectBoundingBox'\n\t\t\t\t\t? bb.y() + bb.height() * this.attribute('fy').numValue()\n\t\t\t\t\t: this.attribute('fy').toPixels('y'))\n\t\t\t\t}\n\n\t\t\t\tconst r = (this.gradientUnits() == 'objectBoundingBox'\n\t\t\t\t\t? (bb.width() + bb.height()) / 2.0 * this.attribute('r').numValue()\n\t\t\t\t\t: this.attribute('r').toPixels())\n\n\t\t\t\treturn ctx.createRadialGradient(fx, fy, 0, cx, cy, r)\n\t\t\t}\n\t\t}\n\t\tsvg.Element.radialGradient.prototype = new svg.Element.GradientBase\n\n\t\t// gradient stop element\n\t\tsvg.Element.stop = function(node) {\n\t\t\tthis.base = svg.Element.ElementBase\n\t\t\tthis.base(node)\n\n\t\t\tthis.offset = this.attribute('offset').numValue()\n\t\t\tif (this.offset < 0) this.offset = 0\n\t\t\tif (this.offset > 1) this.offset = 1\n\n\t\t\tlet stopColor = this.style('stop-color', true)\n\t\t\tif (stopColor.value === '') stopColor.value = '#000'\n\t\t\tif (this.style('stop-opacity').hasValue()) stopColor = stopColor.addOpacity(this.style('stop-opacity'))\n\t\t\tthis.color = stopColor.value\n\t\t}\n\t\tsvg.Element.stop.prototype = new svg.Element.ElementBase\n\n\t\t// animation base element\n\t\tsvg.Element.AnimateBase = function(node) {\n\t\t\tthis.base = svg.Element.ElementBase\n\t\t\tthis.base(node)\n\n\t\t\tsvg.Animations.push(this)\n\n\t\t\tthis.duration = 0.0\n\t\t\tthis.begin = this.attribute('begin').toMilliseconds()\n\t\t\tthis.maxDuration = this.begin + this.attribute('dur').toMilliseconds()\n\n\t\t\tthis.getProperty = function() {\n\t\t\t\tconst attributeType = this.attribute('attributeType').value\n\t\t\t\tconst attributeName = this.attribute('attributeName').value\n\n\t\t\t\tif (attributeType == 'CSS') {\n\t\t\t\t\treturn this.parent.style(attributeName, true)\n\t\t\t\t}\n\t\t\t\treturn this.parent.attribute(attributeName, true)\n\t\t\t}\n\n\t\t\tthis.initialValue = null\n\t\t\tthis.initialUnits = ''\n\t\t\tthis.removed = false\n\n\t\t\tthis.calcValue = function() {\n\t\t\t\t// OVERRIDE ME!\n\t\t\t\treturn ''\n\t\t\t}\n\n\t\t\tthis.update = function(delta) {\n\t\t\t\t// set initial value\n\t\t\t\tif (this.initialValue == null) {\n\t\t\t\t\tthis.initialValue = this.getProperty().value\n\t\t\t\t\tthis.initialUnits = this.getProperty().getUnits()\n\t\t\t\t}\n\n\t\t\t\t// if we're past the end time\n\t\t\t\tif (this.duration > this.maxDuration) {\n\t\t\t\t\t// loop for indefinitely repeating animations\n\t\t\t\t\tif (this.attribute('repeatCount').value == 'indefinite'\n\t\t\t\t\t || this.attribute('repeatDur').value == 'indefinite') {\n\t\t\t\t\t\tthis.duration = 0.0\n\t\t\t\t\t}\n\t\t\t\t\telse if (this.attribute('fill').valueOrDefault('remove') == 'freeze' && !this.frozen) {\n\t\t\t\t\t\tthis.frozen = true\n\t\t\t\t\t\tthis.parent.animationFrozen = true\n\t\t\t\t\t\tthis.parent.animationFrozenValue = this.getProperty().value\n\t\t\t\t\t}\n\t\t\t\t\telse if (this.attribute('fill').valueOrDefault('remove') == 'remove' && !this.removed) {\n\t\t\t\t\t\tthis.removed = true\n\t\t\t\t\t\tthis.getProperty().value = this.parent.animationFrozen ? this.parent.animationFrozenValue : this.initialValue\n\t\t\t\t\t\treturn true\n\t\t\t\t\t}\n\t\t\t\t\treturn false\n\t\t\t\t}\n\t\t\t\tthis.duration += delta\n\n\t\t\t\t// if we're past the begin time\n\t\t\t\tlet updated = false\n\t\t\t\tif (this.begin < this.duration) {\n\t\t\t\t\tlet newValue = this.calcValue() // tween\n\n\t\t\t\t\tif (this.attribute('type').hasValue()) {\n\t\t\t\t\t\t// for transform, etc.\n\t\t\t\t\t\tconst type = this.attribute('type').value\n\t\t\t\t\t\tnewValue = `${type  }(${  newValue  })`\n\t\t\t\t\t}\n\n\t\t\t\t\tthis.getProperty().value = newValue\n\t\t\t\t\tupdated = true\n\t\t\t\t}\n\n\t\t\t\treturn updated\n\t\t\t}\n\n\t\t\tthis.from = this.attribute('from')\n\t\t\tthis.to = this.attribute('to')\n\t\t\tthis.values = this.attribute('values')\n\t\t\tif (this.values.hasValue()) this.values.value = this.values.value.split(';')\n\n\t\t\t// fraction of duration we've covered\n\t\t\tthis.progress = function() {\n\t\t\t\tconst ret = { progress: (this.duration - this.begin) / (this.maxDuration - this.begin) }\n\t\t\t\tif (this.values.hasValue()) {\n\t\t\t\t\tconst p = ret.progress * (this.values.value.length - 1)\n\t\t\t\t\tconst lb = Math.floor(p); const ub = Math.ceil(p)\n\t\t\t\t\tret.from = new svg.Property('from', parseFloat(this.values.value[lb]))\n\t\t\t\t\tret.to = new svg.Property('to', parseFloat(this.values.value[ub]))\n\t\t\t\t\tret.progress = (p - lb) / (ub - lb)\n\t\t\t\t}\n\t\t\t\telse {\n\t\t\t\t\tret.from = this.from\n\t\t\t\t\tret.to = this.to\n\t\t\t\t}\n\t\t\t\treturn ret\n\t\t\t}\n\t\t}\n\t\tsvg.Element.AnimateBase.prototype = new svg.Element.ElementBase\n\n\t\t// animate element\n\t\tsvg.Element.animate = function(node) {\n\t\t\tthis.base = svg.Element.AnimateBase\n\t\t\tthis.base(node)\n\n\t\t\tthis.calcValue = function() {\n\t\t\t\tconst p = this.progress()\n\n\t\t\t\t// tween value linearly\n\t\t\t\tconst newValue = p.from.numValue() + (p.to.numValue() - p.from.numValue()) * p.progress\n\t\t\t\treturn newValue + this.initialUnits\n\t\t\t}\n\t\t}\n\t\tsvg.Element.animate.prototype = new svg.Element.AnimateBase\n\n\t\t// animate color element\n\t\tsvg.Element.animateColor = function(node) {\n\t\t\tthis.base = svg.Element.AnimateBase\n\t\t\tthis.base(node)\n\n\t\t\tthis.calcValue = function() {\n\t\t\t\tconst p = this.progress()\n\t\t\t\tconst from = new RGBColor(p.from.value)\n\t\t\t\tconst to = new RGBColor(p.to.value)\n\n\t\t\t\tif (from.ok && to.ok) {\n\t\t\t\t\t// tween color linearly\n\t\t\t\t\tconst r = from.r + (to.r - from.r) * p.progress\n\t\t\t\t\tconst g = from.g + (to.g - from.g) * p.progress\n\t\t\t\t\tconst b = from.b + (to.b - from.b) * p.progress\n\t\t\t\t\treturn `rgb(${parseInt(r,10)},${parseInt(g,10)},${parseInt(b,10)})`\n\t\t\t\t}\n\t\t\t\treturn this.attribute('from').value\n\t\t\t}\n\t\t}\n\t\tsvg.Element.animateColor.prototype = new svg.Element.AnimateBase\n\n\t\t// animate transform element\n\t\tsvg.Element.animateTransform = function(node) {\n\t\t\tthis.base = svg.Element.AnimateBase\n\t\t\tthis.base(node)\n\n\t\t\tthis.calcValue = function() {\n\t\t\t\tconst p = this.progress()\n\n\t\t\t\t// tween value linearly\n\t\t\t\tconst from = svg.ToNumberArray(p.from.value)\n\t\t\t\tconst to = svg.ToNumberArray(p.to.value)\n\t\t\t\tlet newValue = ''\n\t\t\t\tfor (let i=0; i<from.length; i++) {\n\t\t\t\t\tnewValue += `${from[i] + (to[i] - from[i]) * p.progress  } `\n\t\t\t\t}\n\t\t\t\treturn newValue\n\t\t\t}\n\t\t}\n\t\tsvg.Element.animateTransform.prototype = new svg.Element.animate\n\n\t\t// font element\n\t\tsvg.Element.font = function(node) {\n\t\t\tthis.base = svg.Element.ElementBase\n\t\t\tthis.base(node)\n\n\t\t\tthis.horizAdvX = this.attribute('horiz-adv-x').numValue()\n\n\t\t\tthis.isRTL = false\n\t\t\tthis.isArabic = false\n\t\t\tthis.fontFace = null\n\t\t\tthis.missingGlyph = null\n\t\t\tthis.glyphs = []\n\t\t\tfor (let i=0; i<this.children.length; i++) {\n\t\t\t\tconst child = this.children[i]\n\t\t\t\tif (child.type == 'font-face') {\n\t\t\t\t\tthis.fontFace = child\n\t\t\t\t\tif (child.style('font-family').hasValue()) {\n\t\t\t\t\t\tsvg.Definitions[child.style('font-family').value] = this\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t\telse if (child.type == 'missing-glyph') this.missingGlyph = child\n\t\t\t\telse if (child.type == 'glyph') {\n\t\t\t\t\tif (child.arabicForm != '') {\n\t\t\t\t\t\tthis.isRTL = true\n\t\t\t\t\t\tthis.isArabic = true\n\t\t\t\t\t\tif (typeof this.glyphs[child.unicode] === 'undefined') this.glyphs[child.unicode] = []\n\t\t\t\t\t\tthis.glyphs[child.unicode][child.arabicForm] = child\n\t\t\t\t\t}\n\t\t\t\t\telse {\n\t\t\t\t\t\tthis.glyphs[child.unicode] = child\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t\tsvg.Element.font.prototype = new svg.Element.ElementBase\n\n\t\t// font-face element\n\t\tsvg.Element.fontface = function(node) {\n\t\t\tthis.base = svg.Element.ElementBase\n\t\t\tthis.base(node)\n\n\t\t\tthis.ascent = this.attribute('ascent').value\n\t\t\tthis.descent = this.attribute('descent').value\n\t\t\tthis.unitsPerEm = this.attribute('units-per-em').numValue()\n\t\t}\n\t\tsvg.Element.fontface.prototype = new svg.Element.ElementBase\n\n\t\t// missing-glyph element\n\t\tsvg.Element.missingglyph = function(node) {\n\t\t\tthis.base = svg.Element.path\n\t\t\tthis.base(node)\n\n\t\t\tthis.horizAdvX = 0\n\t\t}\n\t\tsvg.Element.missingglyph.prototype = new svg.Element.path\n\n\t\t// glyph element\n\t\tsvg.Element.glyph = function(node) {\n\t\t\tthis.base = svg.Element.path\n\t\t\tthis.base(node)\n\n\t\t\tthis.horizAdvX = this.attribute('horiz-adv-x').numValue()\n\t\t\tthis.unicode = this.attribute('unicode').value\n\t\t\tthis.arabicForm = this.attribute('arabic-form').value\n\t\t}\n\t\tsvg.Element.glyph.prototype = new svg.Element.path\n\n\t\t// text element\n\t\tsvg.Element.text = function(node) {\n\t\t\tthis.captureTextNodes = true\n\t\t\tthis.base = svg.Element.RenderedElementBase\n\t\t\tthis.base(node)\n\n\t\t\tthis.baseSetContext = this.setContext\n\t\t\tthis.setContext = function(ctx) {\n\t\t\t\tthis.baseSetContext(ctx)\n\n\t\t\t\tlet textBaseline = this.style('dominant-baseline').toTextBaseline()\n\t\t\t\tif (textBaseline == null) textBaseline = this.style('alignment-baseline').toTextBaseline()\n\t\t\t\tif (textBaseline != null) ctx.textBaseline = textBaseline\n\t\t\t}\n\n\t\t\tthis.getBoundingBox = function () {\n\t\t\t\tconst x = this.attribute('x').toPixels('x')\n\t\t\t\tconst y = this.attribute('y').toPixels('y')\n\t\t\t\tconst fontSize = this.parent.style('font-size').numValueOrDefault(svg.Font.Parse(svg.ctx.font).fontSize)\n\t\t\t\treturn new svg.BoundingBox(x, y - fontSize, x + Math.floor(fontSize * 2.0 / 3.0) * this.children[0].getText().length, y)\n\t\t\t}\n\n\t\t\tthis.renderChildren = function(ctx) {\n\t\t\t\tthis.x = this.attribute('x').toPixels('x')\n\t\t\t\tthis.y = this.attribute('y').toPixels('y')\n\t\t\t\tif (this.attribute('dx').hasValue()) this.x += this.attribute('dx').toPixels('x')\n\t\t\t\tif (this.attribute('dy').hasValue()) this.y += this.attribute('dy').toPixels('y')\n\t\t\t\tthis.x += this.getAnchorDelta(ctx, this, 0)\n\t\t\t\tfor (let i=0; i<this.children.length; i++) {\n\t\t\t\t\tthis.renderChild(ctx, this, this, i)\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tthis.getAnchorDelta = function (ctx, parent, startI) {\n\t\t\t\tconst textAnchor = this.style('text-anchor').valueOrDefault('start')\n\t\t\t\tif (textAnchor != 'start') {\n\t\t\t\t\tlet width = 0\n\t\t\t\t\tfor (let i=startI; i<parent.children.length; i++) {\n\t\t\t\t\t\tconst child = parent.children[i]\n\t\t\t\t\t\tif (i > startI && child.attribute('x').hasValue()) break // new group\n\t\t\t\t\t\twidth += child.measureTextRecursive(ctx)\n\t\t\t\t\t}\n\t\t\t\t\treturn -1 * (textAnchor == 'end' ? width : width / 2.0)\n\t\t\t\t}\n\t\t\t\treturn 0\n\t\t\t}\n\n\t\t\tthis.renderChild = function(ctx, textParent, parent, i) {\n\t\t\t\tconst child = parent.children[i]\n\t\t\t\tif (child.attribute('x').hasValue()) {\n\t\t\t\t\tchild.x = child.attribute('x').toPixels('x') + textParent.getAnchorDelta(ctx, parent, i)\n\t\t\t\t\tif (child.attribute('dx').hasValue()) child.x += child.attribute('dx').toPixels('x')\n\t\t\t\t}\n\t\t\t\telse {\n\t\t\t\t\tif (child.attribute('dx').hasValue()) textParent.x += child.attribute('dx').toPixels('x')\n\t\t\t\t\tchild.x = textParent.x\n\t\t\t\t}\n\t\t\t\ttextParent.x = child.x + child.measureText(ctx)\n\n\t\t\t\tif (child.attribute('y').hasValue()) {\n\t\t\t\t\tchild.y = child.attribute('y').toPixels('y')\n\t\t\t\t\tif (child.attribute('dy').hasValue()) child.y += child.attribute('dy').toPixels('y')\n\t\t\t\t}\n\t\t\t\telse {\n\t\t\t\t\tif (child.attribute('dy').hasValue()) textParent.y += child.attribute('dy').toPixels('y')\n\t\t\t\t\tchild.y = textParent.y\n\t\t\t\t}\n\t\t\t\ttextParent.y = child.y\n\n\t\t\t\tchild.render(ctx)\n\n\t\t\t\tfor (var i=0; i<child.children.length; i++) {\n\t\t\t\t\ttextParent.renderChild(ctx, textParent, child, i)\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t\tsvg.Element.text.prototype = new svg.Element.RenderedElementBase\n\n\t\t// text base\n\t\tsvg.Element.TextElementBase = function(node) {\n\t\t\tthis.base = svg.Element.RenderedElementBase\n\t\t\tthis.base(node)\n\n\t\t\tthis.getGlyph = function(font, text, i) {\n\t\t\t\tconst c = text[i]\n\t\t\t\tlet glyph = null\n\t\t\t\tif (font.isArabic) {\n\t\t\t\t\tlet arabicForm = 'isolated'\n\t\t\t\t\tif ((i==0 || text[i-1]==' ') && i<text.length-2 && text[i+1]!=' ') arabicForm = 'terminal'\n\t\t\t\t\tif (i>0 && text[i-1]!=' ' && i<text.length-2 && text[i+1]!=' ') arabicForm = 'medial'\n\t\t\t\t\tif (i>0 && text[i-1]!=' ' && (i == text.length-1 || text[i+1]==' ')) arabicForm = 'initial'\n\t\t\t\t\tif (typeof font.glyphs[c] !== 'undefined') {\n\t\t\t\t\t\tglyph = font.glyphs[c][arabicForm]\n\t\t\t\t\t\tif (glyph == null && font.glyphs[c].type == 'glyph') glyph = font.glyphs[c]\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t\telse {\n\t\t\t\t\tglyph = font.glyphs[c]\n\t\t\t\t}\n\t\t\t\tif (glyph == null) glyph = font.missingGlyph\n\t\t\t\treturn glyph\n\t\t\t}\n\n\t\t\tthis.renderChildren = function(ctx) {\n\t\t\t\tconst customFont = this.parent.style('font-family').getDefinition()\n\t\t\t\tif (customFont != null) {\n\t\t\t\t\tconst fontSize = this.parent.style('font-size').numValueOrDefault(svg.Font.Parse(svg.ctx.font).fontSize)\n\t\t\t\t\tconst fontStyle = this.parent.style('font-style').valueOrDefault(svg.Font.Parse(svg.ctx.font).fontStyle)\n\t\t\t\t\tlet text = this.getText()\n\t\t\t\t\tif (customFont.isRTL) text = text.split(\"\").reverse().join(\"\")\n\n\t\t\t\t\tconst dx = svg.ToNumberArray(this.parent.attribute('dx').value)\n\t\t\t\t\tfor (let i=0; i<text.length; i++) {\n\t\t\t\t\t\tconst glyph = this.getGlyph(customFont, text, i)\n\t\t\t\t\t\tconst scale = fontSize / customFont.fontFace.unitsPerEm\n\t\t\t\t\t\tctx.translate(this.x, this.y)\n\t\t\t\t\t\tctx.scale(scale, -scale)\n\t\t\t\t\t\tconst lw = ctx.lineWidth\n\t\t\t\t\t\tctx.lineWidth = ctx.lineWidth * customFont.fontFace.unitsPerEm / fontSize\n\t\t\t\t\t\tif (fontStyle == 'italic') ctx.transform(1, 0, .4, 1, 0, 0)\n\t\t\t\t\t\tglyph.render(ctx)\n\t\t\t\t\t\tif (fontStyle == 'italic') ctx.transform(1, 0, -.4, 1, 0, 0)\n\t\t\t\t\t\tctx.lineWidth = lw\n\t\t\t\t\t\tctx.scale(1/scale, -1/scale)\n\t\t\t\t\t\tctx.translate(-this.x, -this.y)\n\n\t\t\t\t\t\tthis.x += fontSize * (glyph.horizAdvX || customFont.horizAdvX) / customFont.fontFace.unitsPerEm\n\t\t\t\t\t\tif (typeof dx[i] !== 'undefined' && !isNaN(dx[i])) {\n\t\t\t\t\t\t\tthis.x += dx[i]\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\t\t\t\t\treturn\n\t\t\t\t}\n\n\t\t\t\tif (ctx.fillStyle != '') ctx.fillText(svg.compressSpaces(this.getText()), this.x, this.y)\n\t\t\t\tif (ctx.strokeStyle != '') ctx.strokeText(svg.compressSpaces(this.getText()), this.x, this.y)\n\t\t\t}\n\n\t\t\tthis.getText = function() {\n\t\t\t\t// OVERRIDE ME\n\t\t\t}\n\n\t\t\tthis.measureTextRecursive = function(ctx) {\n\t\t\t\tlet width = this.measureText(ctx)\n\t\t\t\tfor (let i=0; i<this.children.length; i++) {\n\t\t\t\t\twidth += this.children[i].measureTextRecursive(ctx)\n\t\t\t\t}\n\t\t\t\treturn width\n\t\t\t}\n\n\t\t\tthis.measureText = function(ctx) {\n\t\t\t\tconst customFont = this.parent.style('font-family').getDefinition()\n\t\t\t\tif (customFont != null) {\n\t\t\t\t\tconst fontSize = this.parent.style('font-size').numValueOrDefault(svg.Font.Parse(svg.ctx.font).fontSize)\n\t\t\t\t\tlet measure = 0\n\t\t\t\t\tlet text = this.getText()\n\t\t\t\t\tif (customFont.isRTL) text = text.split(\"\").reverse().join(\"\")\n\t\t\t\t\tconst dx = svg.ToNumberArray(this.parent.attribute('dx').value)\n\t\t\t\t\tfor (let i=0; i<text.length; i++) {\n\t\t\t\t\t\tconst glyph = this.getGlyph(customFont, text, i)\n\t\t\t\t\t\tmeasure += (glyph.horizAdvX || customFont.horizAdvX) * fontSize / customFont.fontFace.unitsPerEm\n\t\t\t\t\t\tif (typeof dx[i] !== 'undefined' && !isNaN(dx[i])) {\n\t\t\t\t\t\t\tmeasure += dx[i]\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\t\t\t\t\treturn measure\n\t\t\t\t}\n\n\t\t\t\tconst textToMeasure = svg.compressSpaces(this.getText())\n\t\t\t\tif (!ctx.measureText) return textToMeasure.length * 10\n\n\t\t\t\tctx.save()\n\t\t\t\tthis.setContext(ctx)\n\t\t\t\tconst {width} = ctx.measureText(textToMeasure)\n\t\t\t\tctx.restore()\n\t\t\t\treturn width\n\t\t\t}\n\t\t}\n\t\tsvg.Element.TextElementBase.prototype = new svg.Element.RenderedElementBase\n\n\t\t// tspan\n\t\tsvg.Element.tspan = function(node) {\n\t\t\tthis.captureTextNodes = true\n\t\t\tthis.base = svg.Element.TextElementBase\n\t\t\tthis.base(node)\n\n\t\t\tthis.text = svg.compressSpaces(node.value || node.text || node.textContent || '')\n\t\t\tthis.getText = function() {\n\t\t\t\t// if this node has children, then they own the text\n\t\t\t\tif (this.children.length > 0) { return '' }\n\t\t\t\treturn this.text\n\t\t\t}\n\t\t}\n\t\tsvg.Element.tspan.prototype = new svg.Element.TextElementBase\n\n\t\t// tref\n\t\tsvg.Element.tref = function(node) {\n\t\t\tthis.base = svg.Element.TextElementBase\n\t\t\tthis.base(node)\n\n\t\t\tthis.getText = function() {\n\t\t\t\tconst element = this.getHrefAttribute().getDefinition()\n\t\t\t\tif (element != null) return element.children[0].getText()\n\t\t\t}\n\t\t}\n\t\tsvg.Element.tref.prototype = new svg.Element.TextElementBase\n\n\t\t// a element\n\t\tsvg.Element.a = function(node) {\n\t\t\tthis.base = svg.Element.TextElementBase\n\t\t\tthis.base(node)\n\n\t\t\tthis.hasText = node.childNodes.length > 0\n\t\t\tfor (let i=0; i<node.childNodes.length; i++) {\n\t\t\t\tif (node.childNodes[i].nodeType != 3) this.hasText = false\n\t\t\t}\n\n\t\t\t// this might contain text\n\t\t\tthis.text = this.hasText ? node.childNodes[0].value : ''\n\t\t\tthis.getText = function() {\n\t\t\t\treturn this.text\n\t\t\t}\n\n\t\t\tthis.baseRenderChildren = this.renderChildren\n\t\t\tthis.renderChildren = function(ctx) {\n\t\t\t\tif (this.hasText) {\n\t\t\t\t\t// render as text element\n\t\t\t\t\tthis.baseRenderChildren(ctx)\n\t\t\t\t\tconst fontSize = new svg.Property('fontSize', svg.Font.Parse(svg.ctx.font).fontSize)\n\t\t\t\t\tsvg.Mouse.checkBoundingBox(this, new svg.BoundingBox(this.x, this.y - fontSize.toPixels('y'), this.x + this.measureText(ctx), this.y))\n\t\t\t\t}\n\t\t\t\telse if (this.children.length > 0) {\n\t\t\t\t\t// render as temporary group\n\t\t\t\t\tconst g = new svg.Element.g()\n\t\t\t\t\tg.children = this.children\n\t\t\t\t\tg.parent = this\n\t\t\t\t\tg.render(ctx)\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tthis.onclick = function() {\n\t\t\t\twindow.open(this.getHrefAttribute().value)\n\t\t\t}\n\n\t\t\tthis.onmousemove = function() {\n\t\t\t\tsvg.ctx.canvas.style.cursor = 'pointer'\n\t\t\t}\n\t\t}\n\t\tsvg.Element.a.prototype = new svg.Element.TextElementBase\n\n\t\t// image element\n\t\tsvg.Element.image = function(node) {\n\t\t\tthis.base = svg.Element.RenderedElementBase\n\t\t\tthis.base(node)\n\n\t\t\tconst href = this.getHrefAttribute().value\n\t\t\tif (href == '') { return }\n\t\t\tconst isSvg = href.match(/\\.svg$/)\n\n\t\t\tsvg.Images.push(this)\n\t\t\tthis.loaded = false\n\t\t\tif (!isSvg) {\n\t\t\t\tthis.img = document.createElement('img')\n\t\t\t\tif (svg.opts.useCORS == true) { this.img.crossOrigin = 'Anonymous' }\n\t\t\t\tconst self = this\n\t\t\t\tthis.img.onload = function() { self.loaded = true }\n\t\t\t\tthis.img.onerror = function() { svg.log(`ERROR: image \"${  href  }\" not found`); self.loaded = true }\n\t\t\t\tthis.img.src = href\n\t\t\t}\n\t\t\telse {\n\t\t\t\tthis.img = svg.ajax(href)\n\t\t\t\tthis.loaded = true\n\t\t\t}\n\n\t\t\tthis.renderChildren = function(ctx) {\n\t\t\t\tconst x = this.attribute('x').toPixels('x')\n\t\t\t\tconst y = this.attribute('y').toPixels('y')\n\n\t\t\t\tconst width = this.attribute('width').toPixels('x')\n\t\t\t\tconst height = this.attribute('height').toPixels('y')\n\t\t\t\tif (width == 0 || height == 0) return\n\n\t\t\t\tctx.save()\n\t\t\t\tif (isSvg) {\n\t\t\t\t\tctx.drawSvg(this.img, x, y, width, height)\n\t\t\t\t}\n\t\t\t\telse {\n\t\t\t\t\tctx.translate(x, y)\n\t\t\t\t\tsvg.AspectRatio(ctx,\n\t\t\t\t\t\t\t\t\tthis.attribute('preserveAspectRatio').value,\n\t\t\t\t\t\t\t\t\twidth,\n\t\t\t\t\t\t\t\t\tthis.img.width,\n\t\t\t\t\t\t\t\t\theight,\n\t\t\t\t\t\t\t\t\tthis.img.height,\n\t\t\t\t\t\t\t\t\t0,\n\t\t\t\t\t\t\t\t\t0)\n\t\t\t\t\tctx.drawImage(this.img, 0, 0)\n\t\t\t\t}\n\t\t\t\tctx.restore()\n\t\t\t}\n\n\t\t\tthis.getBoundingBox = function() {\n\t\t\t\tconst x = this.attribute('x').toPixels('x')\n\t\t\t\tconst y = this.attribute('y').toPixels('y')\n\t\t\t\tconst width = this.attribute('width').toPixels('x')\n\t\t\t\tconst height = this.attribute('height').toPixels('y')\n\t\t\t\treturn new svg.BoundingBox(x, y, x + width, y + height)\n\t\t\t}\n\t\t}\n\t\tsvg.Element.image.prototype = new svg.Element.RenderedElementBase\n\n\t\t// group element\n\t\tsvg.Element.g = function(node) {\n\t\t\tthis.base = svg.Element.RenderedElementBase\n\t\t\tthis.base(node)\n\n\t\t\tthis.getBoundingBox = function() {\n\t\t\t\tconst bb = new svg.BoundingBox()\n\t\t\t\tfor (let i=0; i<this.children.length; i++) {\n\t\t\t\t\tbb.addBoundingBox(this.children[i].getBoundingBox())\n\t\t\t\t}\n\t\t\t\treturn bb\n\t\t\t}\n\t\t}\n\t\tsvg.Element.g.prototype = new svg.Element.RenderedElementBase\n\n\t\t// symbol element\n\t\tsvg.Element.symbol = function(node) {\n\t\t\tthis.base = svg.Element.RenderedElementBase\n\t\t\tthis.base(node)\n\n\t\t\tthis.render = function(ctx) {\n\t\t\t\t// NO RENDER\n\t\t\t}\n\t\t}\n\t\tsvg.Element.symbol.prototype = new svg.Element.RenderedElementBase\n\n\t\t// style element\n\t\tsvg.Element.style = function(node) {\n\t\t\tthis.base = svg.Element.ElementBase\n\t\t\tthis.base(node)\n\n\t\t\t// text, or spaces then CDATA\n\t\t\tlet css = ''\n\t\t\tfor (var i=0; i<node.childNodes.length; i++) {\n\t\t\t  css += node.childNodes[i].data\n\t\t\t}\n\t\t\tcss = css.replace(/(\\/\\*([^*]|[\\r\\n]|(\\*+([^*\\/]|[\\r\\n])))*\\*+\\/)|(^[\\s]*\\/\\/.*)/gm, '') // remove comments\n\t\t\tcss = svg.compressSpaces(css) // replace whitespace\n\t\t\tconst cssDefs = css.split('}')\n\t\t\tfor (var i=0; i<cssDefs.length; i++) {\n\t\t\t\tif (svg.trim(cssDefs[i]) != '') {\n\t\t\t\t\tconst cssDef = cssDefs[i].split('{')\n\t\t\t\t\tconst cssClasses = cssDef[0].split(',')\n\t\t\t\t\tconst cssProps = cssDef[1].split(';')\n\t\t\t\t\tfor (let j=0; j<cssClasses.length; j++) {\n\t\t\t\t\t\tconst cssClass = svg.trim(cssClasses[j])\n\t\t\t\t\t\tif (cssClass != '') {\n\t\t\t\t\t\t\tconst props = svg.Styles[cssClass] || {}\n\t\t\t\t\t\t\tfor (let k=0; k<cssProps.length; k++) {\n\t\t\t\t\t\t\t\tconst prop = cssProps[k].indexOf(':')\n\t\t\t\t\t\t\t\tconst name = cssProps[k].substr(0, prop)\n\t\t\t\t\t\t\t\tconst value = cssProps[k].substr(prop + 1, cssProps[k].length - prop)\n\t\t\t\t\t\t\t\tif (name != null && value != null) {\n\t\t\t\t\t\t\t\t\tprops[svg.trim(name)] = new svg.Property(svg.trim(name), svg.trim(value))\n\t\t\t\t\t\t\t\t}\n\t\t\t\t\t\t\t}\n\t\t\t\t\t\t\tsvg.Styles[cssClass] = props\n\t\t\t\t\t\t\tsvg.StylesSpecificity[cssClass] = getSelectorSpecificity(cssClass)\n\t\t\t\t\t\t\tif (cssClass == '@font-face') {\n\t\t\t\t\t\t\t\tconst fontFamily = props['font-family'].value.replace(/\"/g,'')\n\t\t\t\t\t\t\t\tconst srcs = props.src.value.split(',')\n\t\t\t\t\t\t\t\tfor (let s=0; s<srcs.length; s++) {\n\t\t\t\t\t\t\t\t\tif (srcs[s].indexOf('format(\"svg\")') > 0) {\n\t\t\t\t\t\t\t\t\t\tconst urlStart = srcs[s].indexOf('url')\n\t\t\t\t\t\t\t\t\t\tconst urlEnd = srcs[s].indexOf(')', urlStart)\n\t\t\t\t\t\t\t\t\t\tconst url = srcs[s].substr(urlStart + 5, urlEnd - urlStart - 6)\n\t\t\t\t\t\t\t\t\t\tconst doc = svg.parseXml(svg.ajax(url))\n\t\t\t\t\t\t\t\t\t\tconst fonts = doc.getElementsByTagName('font')\n\t\t\t\t\t\t\t\t\t\tfor (let f=0; f<fonts.length; f++) {\n\t\t\t\t\t\t\t\t\t\t\tconst font = svg.CreateElement(fonts[f])\n\t\t\t\t\t\t\t\t\t\t\tsvg.Definitions[fontFamily] = font\n\t\t\t\t\t\t\t\t\t\t}\n\t\t\t\t\t\t\t\t\t}\n\t\t\t\t\t\t\t\t}\n\t\t\t\t\t\t\t}\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t\tsvg.Element.style.prototype = new svg.Element.ElementBase\n\n\t\t// use element\n\t\tsvg.Element.use = function(node) {\n\t\t\tthis.base = svg.Element.RenderedElementBase\n\t\t\tthis.base(node)\n\n\t\t\tthis.baseSetContext = this.setContext\n\t\t\tthis.setContext = function(ctx) {\n\t\t\t\tthis.baseSetContext(ctx)\n\t\t\t\tif (this.attribute('x').hasValue()) ctx.translate(this.attribute('x').toPixels('x'), 0)\n\t\t\t\tif (this.attribute('y').hasValue()) ctx.translate(0, this.attribute('y').toPixels('y'))\n\t\t\t}\n\n\t\t\tconst element = this.getHrefAttribute().getDefinition()\n\n\t\t\tthis.path = function(ctx) {\n\t\t\t\tif (element != null) element.path(ctx)\n\t\t\t}\n\n\t\t\tthis.getBoundingBox = function() {\n\t\t\t\tif (element != null) return element.getBoundingBox()\n\t\t\t}\n\n\t\t\tthis.renderChildren = function(ctx) {\n\t\t\t\tif (element != null) {\n\t\t\t\t\tlet tempSvg = element\n\t\t\t\t\tif (element.type == 'symbol') {\n\t\t\t\t\t\t// render me using a temporary svg element in symbol cases (http://www.w3.org/TR/SVG/struct.html#UseElement)\n\t\t\t\t\t\ttempSvg = new svg.Element.svg()\n\t\t\t\t\t\ttempSvg.type = 'svg'\n\t\t\t\t\t\ttempSvg.attributes.viewBox = new svg.Property('viewBox', element.attribute('viewBox').value)\n\t\t\t\t\t\ttempSvg.attributes.preserveAspectRatio = new svg.Property('preserveAspectRatio', element.attribute('preserveAspectRatio').value)\n\t\t\t\t\t\ttempSvg.attributes.overflow = new svg.Property('overflow', element.attribute('overflow').value)\n\t\t\t\t\t\ttempSvg.children = element.children\n\t\t\t\t\t}\n\t\t\t\t\tif (tempSvg.type == 'svg') {\n\t\t\t\t\t\t// if symbol or svg, inherit width/height from me\n\t\t\t\t\t\tif (this.attribute('width').hasValue()) tempSvg.attributes.width = new svg.Property('width', this.attribute('width').value)\n\t\t\t\t\t\tif (this.attribute('height').hasValue()) tempSvg.attributes.height = new svg.Property('height', this.attribute('height').value)\n\t\t\t\t\t}\n\t\t\t\t\tconst oldParent = tempSvg.parent\n\t\t\t\t\ttempSvg.parent = null\n\t\t\t\t\ttempSvg.render(ctx)\n\t\t\t\t\ttempSvg.parent = oldParent\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t\tsvg.Element.use.prototype = new svg.Element.RenderedElementBase\n\n\t\t// mask element\n\t\tsvg.Element.mask = function(node) {\n\t\t\tthis.base = svg.Element.ElementBase\n\t\t\tthis.base(node)\n\n\t\t\tthis.apply = function(ctx, element) {\n\t\t\t\t// render as temp svg\n\t\t\t\tvar x = this.attribute('x').toPixels('x')\n\t\t\t\tvar y = this.attribute('y').toPixels('y')\n\t\t\t\tvar width = this.attribute('width').toPixels('x')\n\t\t\t\tvar height = this.attribute('height').toPixels('y')\n\n\t\t\t\tif (width == 0 && height == 0) {\n\t\t\t\t\tconst bb = new svg.BoundingBox()\n\t\t\t\t\tfor (let i=0; i<this.children.length; i++) {\n\t\t\t\t\t\tbb.addBoundingBox(this.children[i].getBoundingBox())\n\t\t\t\t\t}\n\t\t\t\t\tvar x = Math.floor(bb.x1)\n\t\t\t\t\tvar y = Math.floor(bb.y1)\n\t\t\t\t\tvar width = Math.floor(bb.width())\n\t\t\t\t\tvar\theight = Math.floor(bb.height())\n\t\t\t\t}\n\n\t\t\t\t// temporarily remove mask to avoid recursion\n\t\t\t\tconst mask = element.attribute('mask').value\n\t\t\t\telement.attribute('mask').value = ''\n\n\t\t\t\t\tconst cMask = document.createElement('canvas')\n\t\t\t\t\tcMask.width = x + width\n\t\t\t\t\tcMask.height = y + height\n\t\t\t\t\tconst maskCtx = cMask.getContext('2d')\n\t\t\t\t\tthis.renderChildren(maskCtx)\n\n\t\t\t\t\tconst c = document.createElement('canvas')\n\t\t\t\t\tc.width = x + width\n\t\t\t\t\tc.height = y + height\n\t\t\t\t\tconst tempCtx = c.getContext('2d')\n\t\t\t\t\telement.render(tempCtx)\n\t\t\t\t\ttempCtx.globalCompositeOperation = 'destination-in'\n\t\t\t\t\ttempCtx.fillStyle = maskCtx.createPattern(cMask, 'no-repeat')\n\t\t\t\t\ttempCtx.fillRect(0, 0, x + width, y + height)\n\n\t\t\t\t\tctx.fillStyle = tempCtx.createPattern(c, 'no-repeat')\n\t\t\t\t\tctx.fillRect(0, 0, x + width, y + height)\n\n\t\t\t\t// reassign mask\n\t\t\t\telement.attribute('mask').value = mask\n\t\t\t}\n\n\t\t\tthis.render = function(ctx) {\n\t\t\t\t// NO RENDER\n\t\t\t}\n\t\t}\n\t\tsvg.Element.mask.prototype = new svg.Element.ElementBase\n\n\t\t// clip element\n\t\tsvg.Element.clipPath = function(node) {\n\t\t\tthis.base = svg.Element.ElementBase\n\t\t\tthis.base(node)\n\n\t\t\tthis.apply = function(ctx) {\n\t\t\t\tconst oldBeginPath = CanvasRenderingContext2D.prototype.beginPath\n\t\t\t\tCanvasRenderingContext2D.prototype.beginPath = function () { }\n\n\t\t\t\tconst oldClosePath = CanvasRenderingContext2D.prototype.closePath\n\t\t\t\tCanvasRenderingContext2D.prototype.closePath = function () { }\n\n\t\t\t\toldBeginPath.call(ctx)\n\t\t\t\tfor (let i=0; i<this.children.length; i++) {\n\t\t\t\t\tconst child = this.children[i]\n\t\t\t\t\tif (typeof child.path !== 'undefined') {\n\t\t\t\t\t\tlet transform = null\n\t\t\t\t\t\tif (child.style('transform', false, true).hasValue()) {\n\t\t\t\t\t\t\ttransform = new svg.Transform(child.style('transform', false, true).value)\n\t\t\t\t\t\t\ttransform.apply(ctx)\n\t\t\t\t\t\t}\n\t\t\t\t\t\tchild.path(ctx)\n\t\t\t\t\t\tCanvasRenderingContext2D.prototype.closePath = oldClosePath\n\t\t\t\t\t\tif (transform) { transform.unapply(ctx) }\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t\toldClosePath.call(ctx)\n\t\t\t\tctx.clip()\n\n\t\t\t\tCanvasRenderingContext2D.prototype.beginPath = oldBeginPath\n\t\t\t\tCanvasRenderingContext2D.prototype.closePath = oldClosePath\n\t\t\t}\n\n\t\t\tthis.render = function(ctx) {\n\t\t\t\t// NO RENDER\n\t\t\t}\n\t\t}\n\t\tsvg.Element.clipPath.prototype = new svg.Element.ElementBase\n\n\t\t// filters\n\t\tsvg.Element.filter = function(node) {\n\t\t\tthis.base = svg.Element.ElementBase\n\t\t\tthis.base(node)\n\n\t\t\tthis.apply = function(ctx, element) {\n\t\t\t\t// render as temp svg\n\t\t\t\tconst bb = element.getBoundingBox()\n\t\t\t\tconst x = Math.floor(bb.x1)\n\t\t\t\tconst y = Math.floor(bb.y1)\n\t\t\t\tconst width = Math.floor(bb.width())\n\t\t\t\tconst\theight = Math.floor(bb.height())\n\n\t\t\t\t// temporarily remove filter to avoid recursion\n\t\t\t\tconst filter = element.style('filter').value\n\t\t\t\telement.style('filter').value = ''\n\n\t\t\t\tlet px = 0; let py = 0\n\t\t\t\tfor (var i=0; i<this.children.length; i++) {\n\t\t\t\t\tconst efd = this.children[i].extraFilterDistance || 0\n\t\t\t\t\tpx = Math.max(px, efd)\n\t\t\t\t\tpy = Math.max(py, efd)\n\t\t\t\t}\n\n\t\t\t\tconst c = document.createElement('canvas')\n\t\t\t\tc.width = width + 2*px\n\t\t\t\tc.height = height + 2*py\n\t\t\t\tconst tempCtx = c.getContext('2d')\n\t\t\t\ttempCtx.translate(-x + px, -y + py)\n\t\t\t\telement.render(tempCtx)\n\n\t\t\t\t// apply filters\n\t\t\t\tfor (var i=0; i<this.children.length; i++) {\n\t\t\t\t\tif (typeof this.children[i].apply === 'function') {\n\t\t\t\t\t\tthis.children[i].apply(tempCtx, 0, 0, width + 2*px, height + 2*py)\n\t\t\t\t\t}\n\t\t\t\t}\n\n\t\t\t\t// render on me\n\t\t\t\tctx.drawImage(c, 0, 0, width + 2*px, height + 2*py, x - px, y - py, width + 2*px, height + 2*py)\n\n\t\t\t\t// reassign filter\n\t\t\t\telement.style('filter', true).value = filter\n\t\t\t}\n\n\t\t\tthis.render = function(ctx) {\n\t\t\t\t// NO RENDER\n\t\t\t}\n\t\t}\n\t\tsvg.Element.filter.prototype = new svg.Element.ElementBase\n\n\t\t// Credit for `feDropShadow` goes to InvisionApp Canvg Fork\n\t\tsvg.Element.feDropShadow = function(node) {\n\t\t\tthis.base = svg.Element.ElementBase\n\t\t\tthis.base(node)\n\t\t\tthis.addStylesFromStyleDefinition()\n\n\t\t\tthis.apply = function(ctx, x, y, width, height) {\n\t\t\t\t// TODO: implement\n\t\t\t }\n\t\t}\n\t\tsvg.Element.feDropShadow.prototype = new svg.Element.ElementBase\n\n\t\tsvg.Element.feMorphology = function(node) {\n\t\t\tthis.base = svg.Element.ElementBase\n\t\t\tthis.base(node)\n\n\t\t\tthis.apply = function(ctx, x, y, width, height) {\n\t\t\t\t// TODO: implement\n\t\t\t}\n\t\t}\n\t\tsvg.Element.feMorphology.prototype = new svg.Element.ElementBase\n\n\t\tsvg.Element.feComposite = function(node) {\n\t\t\tthis.base = svg.Element.ElementBase\n\t\t\tthis.base(node)\n\n\t\t\tthis.apply = function(ctx, x, y, width, height) {\n\t\t\t\t// TODO: implement\n\t\t\t}\n\t\t}\n\t\tsvg.Element.feComposite.prototype = new svg.Element.ElementBase\n\n\t\tsvg.Element.feColorMatrix = function(node) {\n\t\t\tthis.base = svg.Element.ElementBase\n\t\t\tthis.base(node)\n\n\t\t\tlet matrix = svg.ToNumberArray(this.attribute('values').value)\n\t\t\tswitch (this.attribute('type').valueOrDefault('matrix')) { // http://www.w3.org/TR/SVG/filters.html#feColorMatrixElement\n\t\t\t\tcase 'saturate':\n\t\t\t\t\tvar s = matrix[0]\n\t\t\t\t\tmatrix = [0.213+0.787*s,0.715-0.715*s,0.072-0.072*s,0,0,\n\t\t\t\t\t\t\t  0.213-0.213*s,0.715+0.285*s,0.072-0.072*s,0,0,\n\t\t\t\t\t\t\t  0.213-0.213*s,0.715-0.715*s,0.072+0.928*s,0,0,\n\t\t\t\t\t\t\t  0,0,0,1,0,\n\t\t\t\t\t\t\t  0,0,0,0,1]\n\t\t\t\t\tbreak\n\t\t\t\tcase 'hueRotate':\n\t\t\t\t\tvar a = matrix[0] * Math.PI / 180.0\n\t\t\t\t\tvar c = function (m1,m2,m3) { return m1 + Math.cos(a)*m2 + Math.sin(a)*m3 }\n\t\t\t\t\tmatrix = [c(0.213,0.787,-0.213),c(0.715,-0.715,-0.715),c(0.072,-0.072,0.928),0,0,\n\t\t\t\t\t\t\t  c(0.213,-0.213,0.143),c(0.715,0.285,0.140),c(0.072,-0.072,-0.283),0,0,\n\t\t\t\t\t\t\t  c(0.213,-0.213,-0.787),c(0.715,-0.715,0.715),c(0.072,0.928,0.072),0,0,\n\t\t\t\t\t\t\t  0,0,0,1,0,\n\t\t\t\t\t\t\t  0,0,0,0,1]\n\t\t\t\t\tbreak\n\t\t\t\tcase 'luminanceToAlpha':\n\t\t\t\t\tmatrix = [0,0,0,0,0,\n\t\t\t\t\t\t\t  0,0,0,0,0,\n\t\t\t\t\t\t\t  0,0,0,0,0,\n\t\t\t\t\t\t\t  0.2125,0.7154,0.0721,0,0,\n\t\t\t\t\t\t\t  0,0,0,0,1]\n\t\t\t\t\tbreak\n\t\t\t}\n\n\t\t\tfunction imGet(img, x, y, width, height, rgba) {\n\t\t\t\treturn img[y*width*4 + x*4 + rgba]\n\t\t\t}\n\n\t\t\tfunction imSet(img, x, y, width, height, rgba, val) {\n\t\t\t\timg[y*width*4 + x*4 + rgba] = val\n\t\t\t}\n\n\t\t\tfunction m(i, v) {\n\t\t\t\tconst mi = matrix[i]\n\t\t\t\treturn mi * (mi < 0 ? v - 255 : v)\n\t\t\t}\n\n\t\t\tthis.apply = function(ctx, x, y, width, height) {\n\t\t\t\t// assuming x==0 && y==0 for now\n\t\t\t\tconst srcData = ctx.getImageData(0, 0, width, height)\n\t\t\t\tfor (var y = 0; y < height; y++) {\n\t\t\t\t\tfor (var x = 0; x < width; x++) {\n\t\t\t\t\t\tconst r = imGet(srcData.data, x, y, width, height, 0)\n\t\t\t\t\t\tconst g = imGet(srcData.data, x, y, width, height, 1)\n\t\t\t\t\t\tconst b = imGet(srcData.data, x, y, width, height, 2)\n\t\t\t\t\t\tconst a = imGet(srcData.data, x, y, width, height, 3)\n\t\t\t\t\t\timSet(srcData.data, x, y, width, height, 0, m(0,r)+m(1,g)+m(2,b)+m(3,a)+m(4,1))\n\t\t\t\t\t\timSet(srcData.data, x, y, width, height, 1, m(5,r)+m(6,g)+m(7,b)+m(8,a)+m(9,1))\n\t\t\t\t\t\timSet(srcData.data, x, y, width, height, 2, m(10,r)+m(11,g)+m(12,b)+m(13,a)+m(14,1))\n\t\t\t\t\t\timSet(srcData.data, x, y, width, height, 3, m(15,r)+m(16,g)+m(17,b)+m(18,a)+m(19,1))\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t\tctx.clearRect(0, 0, width, height)\n\t\t\t\tctx.putImageData(srcData, 0, 0)\n\t\t\t}\n\t\t}\n\t\tsvg.Element.feColorMatrix.prototype = new svg.Element.ElementBase\n\n\t\tsvg.Element.feGaussianBlur = function(node) {\n\t\t\tthis.base = svg.Element.ElementBase\n\t\t\tthis.base(node)\n\n\t\t\tthis.blurRadius = Math.floor(this.attribute('stdDeviation').numValue())\n\t\t\tthis.extraFilterDistance = this.blurRadius\n\n\t\t\tthis.apply = function(ctx, x, y, width, height) {\n\t\t\t\tif (typeof stackBlur.canvasRGBA === 'undefined') {\n\t\t\t\t\tsvg.log('ERROR: StackBlur.js must be included for blur to work')\n\t\t\t\t\treturn\n\t\t\t\t}\n\n\t\t\t\t// StackBlur requires canvas be on document\n\t\t\t\tctx.canvas.id = svg.UniqueId()\n\t\t\t\tctx.canvas.style.display = 'none'\n\t\t\t\tdocument.body.appendChild(ctx.canvas)\n\t\t\t\tstackBlur.canvasRGBA(ctx.canvas.id, x, y, width, height, this.blurRadius)\n\t\t\t\tdocument.body.removeChild(ctx.canvas)\n\t\t\t}\n\t\t}\n\t\tsvg.Element.feGaussianBlur.prototype = new svg.Element.ElementBase\n\n\t\t// title element, do nothing\n\t\tsvg.Element.title = function(node) {\n\t\t}\n\t\tsvg.Element.title.prototype = new svg.Element.ElementBase\n\n\t\t// desc element, do nothing\n\t\tsvg.Element.desc = function(node) {\n\t\t}\n\t\tsvg.Element.desc.prototype = new svg.Element.ElementBase\n\n\t\tsvg.Element.MISSING = function(node) {\n\t\t\tsvg.log(`ERROR: Element '${  node.nodeName  }' not yet implemented.`)\n\t\t}\n\t\tsvg.Element.MISSING.prototype = new svg.Element.ElementBase\n\n\t\t// element factory\n\t\tsvg.CreateElement = function(node) {\n\t\t\tlet className = node.nodeName.replace(/^[^:]+:/,'') // remove namespace\n\t\t\tclassName = className.replace(/\\-/g,'') // remove dashes\n\t\t\tlet e = null\n\t\t\tif (typeof svg.Element[className] !== 'undefined') {\n\t\t\t\te = new svg.Element[className](node)\n\t\t\t}\n\t\t\telse {\n\t\t\t\te = new svg.Element.MISSING(node)\n\t\t\t}\n\n\t\t\te.type = node.nodeName\n\t\t\treturn e\n\t\t}\n\n\t\t// load from url\n\t\tsvg.load = function(ctx, url) {\n\t\t\tsvg.loadXml(ctx, svg.ajax(url))\n\t\t}\n\n\t\t// load from xml\n\t\tsvg.loadXml = function(ctx, xml) {\n\t\t\tsvg.loadXmlDoc(ctx, svg.parseXml(xml))\n\t\t}\n\n\t\tsvg.loadXmlDoc = function(ctx, dom) {\n\t\t\tsvg.init(ctx)\n\n\t\t\tconst mapXY = function(p) {\n\t\t\t\tlet e = ctx.canvas\n\t\t\t\twhile (e) {\n\t\t\t\t\tp.x -= e.offsetLeft\n\t\t\t\t\tp.y -= e.offsetTop\n\t\t\t\t\te = e.offsetParent\n\t\t\t\t}\n\t\t\t\tif (window.scrollX) p.x += window.scrollX\n\t\t\t\tif (window.scrollY) p.y += window.scrollY\n\t\t\t\treturn p\n\t\t\t}\n\n\t\t\t// bind mouse\n\t\t\tif (svg.opts.ignoreMouse != true) {\n\t\t\t\tctx.canvas.onclick = function(e) {\n\t\t\t\t\tconst p = mapXY(new svg.Point(e != null ? e.clientX : event.clientX, e != null ? e.clientY : event.clientY))\n\t\t\t\t\tsvg.Mouse.onclick(p.x, p.y)\n\t\t\t\t}\n\t\t\t\tctx.canvas.onmousemove = function(e) {\n\t\t\t\t\tconst p = mapXY(new svg.Point(e != null ? e.clientX : event.clientX, e != null ? e.clientY : event.clientY))\n\t\t\t\t\tsvg.Mouse.onmousemove(p.x, p.y)\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tconst e = svg.CreateElement(dom.documentElement)\n\t\t\te.root = true\n\t\t\te.addStylesFromStyleDefinition()\n\n\t\t\t// render loop\n\t\t\tlet isFirstRender = true\n\t\t\tconst draw = function() {\n\t\t\t\tsvg.ViewPort.Clear()\n\t\t\t\tif (ctx.canvas.parentNode) svg.ViewPort.SetCurrent(ctx.canvas.parentNode.clientWidth, ctx.canvas.parentNode.clientHeight)\n\n\t\t\t\tif (svg.opts.ignoreDimensions != true) {\n\t\t\t\t\t// set canvas size\n\t\t\t\t\tif (e.style('width').hasValue()) {\n\t\t\t\t\t\tctx.canvas.width = e.style('width').toPixels('x')\n\t\t\t\t\t\tctx.canvas.style.width = `${ctx.canvas.width  }px`\n\t\t\t\t\t}\n\t\t\t\t\tif (e.style('height').hasValue()) {\n\t\t\t\t\t\tctx.canvas.height = e.style('height').toPixels('y')\n\t\t\t\t\t\tctx.canvas.style.height = `${ctx.canvas.height  }px`\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t\tlet cWidth = ctx.canvas.clientWidth || ctx.canvas.width\n\t\t\t\tlet cHeight = ctx.canvas.clientHeight || ctx.canvas.height\n\t\t\t\tif (svg.opts.ignoreDimensions == true && e.style('width').hasValue() && e.style('height').hasValue()) {\n\t\t\t\t\tcWidth = e.style('width').toPixels('x')\n\t\t\t\t\tcHeight = e.style('height').toPixels('y')\n\t\t\t\t}\n\t\t\t\tsvg.ViewPort.SetCurrent(cWidth, cHeight)\n\n\t\t\t\tif (svg.opts.offsetX != null) e.attribute('x', true).value = svg.opts.offsetX\n\t\t\t\tif (svg.opts.offsetY != null) e.attribute('y', true).value = svg.opts.offsetY\n\t\t\t\tif (svg.opts.scaleWidth != null || svg.opts.scaleHeight != null) {\n\t\t\t\t\tlet xRatio = null; let yRatio = null; const viewBox = svg.ToNumberArray(e.attribute('viewBox').value)\n\n\t\t\t\t\tif (svg.opts.scaleWidth != null) {\n\t\t\t\t\t\tif (e.attribute('width').hasValue()) xRatio = e.attribute('width').toPixels('x') / svg.opts.scaleWidth\n\t\t\t\t\t\telse if (!isNaN(viewBox[2])) xRatio = viewBox[2] / svg.opts.scaleWidth\n\t\t\t\t\t}\n\n\t\t\t\t\tif (svg.opts.scaleHeight != null) {\n\t\t\t\t\t\tif (e.attribute('height').hasValue()) yRatio = e.attribute('height').toPixels('y') / svg.opts.scaleHeight\n\t\t\t\t\t\telse if (!isNaN(viewBox[3])) yRatio = viewBox[3] / svg.opts.scaleHeight\n\t\t\t\t\t}\n\n\t\t\t\t\tif (xRatio == null) { xRatio = yRatio }\n\t\t\t\t\tif (yRatio == null) { yRatio = xRatio }\n\n\t\t\t\t\te.attribute('width', true).value = svg.opts.scaleWidth\n\t\t\t\t\te.attribute('height', true).value = svg.opts.scaleHeight\n\t\t\t\t\te.style('transform', true, true).value += ` scale(${1.0/xRatio},${1.0/yRatio})`\n\t\t\t\t}\n\n\t\t\t\t// clear and render\n\t\t\t\tif (svg.opts.ignoreClear != true) {\n\t\t\t\t\tctx.clearRect(0, 0, cWidth, cHeight)\n\t\t\t\t}\n\t\t\t\te.render(ctx)\n\t\t\t\tif (isFirstRender) {\n\t\t\t\t\tisFirstRender = false\n\t\t\t\t\tif (typeof svg.opts.renderCallback === 'function') svg.opts.renderCallback(dom)\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tlet waitingForImages = true\n\t\t\tif (svg.ImagesLoaded()) {\n\t\t\t\twaitingForImages = false\n\t\t\t\tdraw()\n\t\t\t}\n\t\t\tsvg.intervalID = setInterval(function() {\n\t\t\t\tlet needUpdate = false\n\n\t\t\t\tif (waitingForImages && svg.ImagesLoaded()) {\n\t\t\t\t\twaitingForImages = false\n\t\t\t\t\tneedUpdate = true\n\t\t\t\t}\n\n\t\t\t\t// need update from mouse events?\n\t\t\t\tif (svg.opts.ignoreMouse != true) {\n\t\t\t\t\tneedUpdate |= svg.Mouse.hasEvents()\n\t\t\t\t}\n\n\t\t\t\t// need update from animations?\n\t\t\t\tif (svg.opts.ignoreAnimation != true) {\n\t\t\t\t\tfor (let i=0; i<svg.Animations.length; i++) {\n\t\t\t\t\t\tneedUpdate |= svg.Animations[i].update(1000 / svg.FRAMERATE)\n\t\t\t\t\t}\n\t\t\t\t}\n\n\t\t\t\t// need update from redraw?\n\t\t\t\tif (typeof svg.opts.forceRedraw === 'function') {\n\t\t\t\t\tif (svg.opts.forceRedraw() == true) needUpdate = true\n\t\t\t\t}\n\n\t\t\t\t// render if needed\n\t\t\t\tif (needUpdate) {\n\t\t\t\t\tdraw()\n\t\t\t\t\tsvg.Mouse.runEvents() // run and clear our events\n\t\t\t\t}\n\t\t\t}, 1000 / svg.FRAMERATE)\n\t\t}\n\n\t\tsvg.stop = function() {\n\t\t\tif (svg.intervalID) {\n\t\t\t\tclearInterval(svg.intervalID)\n\t\t\t}\n\t\t}\n\n\t\tsvg.Mouse = new (function() {\n\t\t\tthis.events = []\n\t\t\tthis.hasEvents = function() { return this.events.length != 0 }\n\n\t\t\tthis.onclick = function(x, y) {\n\t\t\t\tthis.events.push({ type: 'onclick', x: x, y: y,\n\t\t\t\t\trun: function(e) { if (e.onclick) e.onclick() }\n\t\t\t\t})\n\t\t\t}\n\n\t\t\tthis.onmousemove = function(x, y) {\n\t\t\t\tthis.events.push({ type: 'onmousemove', x: x, y: y,\n\t\t\t\t\trun: function(e) { if (e.onmousemove) e.onmousemove() }\n\t\t\t\t})\n\t\t\t}\n\n\t\t\tthis.eventElements = []\n\n\t\t\tthis.checkPath = function(element, ctx) {\n\t\t\t\tfor (let i=0; i<this.events.length; i++) {\n\t\t\t\t\tconst e = this.events[i]\n\t\t\t\t\tif (ctx.isPointInPath && ctx.isPointInPath(e.x, e.y)) this.eventElements[i] = element\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tthis.checkBoundingBox = function(element, bb) {\n\t\t\t\tfor (let i=0; i<this.events.length; i++) {\n\t\t\t\t\tconst e = this.events[i]\n\t\t\t\t\tif (bb.isPointInBox(e.x, e.y)) this.eventElements[i] = element\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tthis.runEvents = function() {\n\t\t\t\tsvg.ctx.canvas.style.cursor = ''\n\n\t\t\t\tfor (let i=0; i<this.events.length; i++) {\n\t\t\t\t\tconst e = this.events[i]\n\t\t\t\t\tlet element = this.eventElements[i]\n\t\t\t\t\twhile (element) {\n\t\t\t\t\t\te.run(element)\n\t\t\t\t\t\telement = element.parent\n\t\t\t\t\t}\n\t\t\t\t}\n\n\t\t\t\t// done running, clear\n\t\t\t\tthis.events = []\n\t\t\t\tthis.eventElements = []\n\t\t\t}\n\t\t})\n\n\t\treturn svg\n\t};\n\n\tif (typeof CanvasRenderingContext2D  !== 'undefined') {\n\t\tCanvasRenderingContext2D.prototype.drawSvg = function(s, dx, dy, dw, dh, opts) {\n\t\t\tconst cOpts = {\n\t\t\t\tignoreMouse: true,\n\t\t\t\tignoreAnimation: true,\n\t\t\t\tignoreDimensions: true,\n\t\t\t\tignoreClear: true,\n\t\t\t\toffsetX: dx,\n\t\t\t\toffsetY: dy,\n\t\t\t\tscaleWidth: dw,\n\t\t\t\tscaleHeight: dh\n\t\t\t}\n\t\t\t\n\t\t\tfor(const prop in opts) {\n\t\t\t\tif(opts.hasOwnProperty(prop)){\n\t\t\t\t\tcOpts[prop] = opts[prop]\n\t\t\t\t}\n\t\t\t}\n\t\t\tcanvg(this.canvas, s, cOpts)\n\t\t}\n\t}\n\n\treturn canvg\n\n}));\n\n// requires: joint.format.svg.js plugin\n// support 3rd party library: canvg - canvg.js, rgbcolor.js, StackBlur.js\n\n(function(joint) {\n    \n\n    /**\n     * @public\n     * @param {function} callback\n     * @param {{width?:number, height?: number, size?:string, padding?: Object|number type: string backgroundColor: string quality: string }} opt\n     */\n    joint.dia.Paper.prototype.toDataURL = function(callback, opt) {\n\n        // check whether the svg export plugin was loaded.\n        if (typeof this.toSVG !== 'function') throw new Error('The joint.format.svg.js plugin must be loaded.')\n\n        // options: type, width, height, quality (works only with type set to 'image/jpeg' or 'image/webp'),\n        // backgroundColor\n        opt = opt || {}\n\n        const clientRect = opt.area || this.paperToLocalRect(this.getContentBBox())\n        const svgViewBox = createSVGViewBox(clientRect, opt)\n\n        const dimensions = (joint.util.isNumber(opt.width) && joint.util.isNumber(opt.height)) ? opt : svgViewBox\n        const rasterSize = scaleRasterSize(dimensions, getScale(opt.size))\n        if (!isCanvasSizeAllowed(rasterSize.width, rasterSize.height)) {\n            throw new Error('dia.Paper: raster size exceeded.')\n        }\n\n        const img = new Image()\n        let svg\n\n        // Drawing an image into the canvas has to be done after the image was completely loaded.\n        img.onload = function() {\n\n            let dataURL; let context; let canvas\n\n            // Helper to create a new canvas.\n            function createCanvas() {\n\n                canvas = document.createElement('canvas')\n                canvas.width = rasterSize.width\n                canvas.height = rasterSize.height\n\n                // Draw rectangle of a certain color covering the whole canvas area.\n                // A JPEG image has black background by default and it might not be desirable.\n                context = canvas.getContext('2d')\n                context.fillStyle = opt.backgroundColor || 'white'\n                context.fillRect(0, 0, rasterSize.width, rasterSize.height)\n            }\n\n            // Helper to read the canvas\n            function readCanvas() {\n\n                // Try to read the content of our canvas.\n                dataURL = canvas.toDataURL(opt.type, opt.quality)\n                // Return dataURL in the given callback.\n                callback(dataURL)\n\n                stopTimer()\n            }\n\n            function stopTimer() {\n                if (canvas.svg && joint.util.isFunction(canvas.svg.stop)) {\n                    // Clear the interval that is set up by the Canvg lib.\n                    setTimeout(canvas.svg.stop, 1)\n                }\n            }\n\n            createCanvas()\n\n            // Drawing SVG images can taint our canvas in some browsers. That means we won't be able\n            // to read canvas back as it would fail with `Error: SecurityError: DOM Exception 18`.\n            // See `http://getcontext.net/read/chrome-securityerror-dom-exception-18`.\n            try {\n\n                // Draw the image to the canvas with native `drawImage` method.\n                context.drawImage(img, 0, 0, rasterSize.width, rasterSize.height)\n\n                readCanvas()\n\n            } catch (e) {\n\n                /* global canvg:true */\n                // The security error was thrown. We have to parse and render the SVG image with\n                // `canvg` library (https://code.google.com/p/canvg/).\n                if (typeof canvg === 'undefined') {\n\n                    // The library is not present.\n                    console.error('Canvas tainted. Canvg library required.')\n                    return\n                }\n\n                // The canvas was tainted. We need to render a new one. Clearing only the content won't help.\n                createCanvas()\n\n                // Draw the SVG with canvg library.\n                const canvgOpt = {\n                    ignoreDimensions: true,\n                    ignoreClear: true,\n                    ignoreMouse: true,\n                    ignoreAnimation: true,\n                    offsetX: 0,\n                    offsetY: 0,\n                    useCORS: true\n                }\n\n                canvg(canvas, svg, joint.util.assign(canvgOpt, {\n\n                    forceRedraw: function() {\n                        // Force the redraw only the first time.\n                        // Important in case the canvg is waiting for images to be loaded.\n                        if (this.called) {\n                            return false\n                        }\n                        this.called = true\n\n                        return true\n                    }.bind({ called: false }),\n\n                    renderCallback: function() {\n\n                        try {\n\n                            readCanvas()\n\n                        } catch (e) {\n\n\n                            stopTimer()\n                            // As IE throws security error when trying to\n                            // draw an SVG into the canvas that contains (even though data-uri'ed)\n                            // <image> element with another SVG in it, we apply a little trick here.\n                            // The trick is in replacing all <image> elements that have\n                            // SVG in xlink:href with embedded <svg> elements.\n                            svg = replaceSVGImagesWithSVGEmbedded(svg)\n\n                            // And try again. If even this fails, there is no hope.\n                            createCanvas()\n\n                            canvg(canvas, svg, joint.util.assign(canvgOpt, { renderCallback: readCanvas }))\n                        }\n                    }\n                }))\n                /* global canvg:false */\n            }\n        }\n\n        this.toSVG(function(svgString) {\n\n            // Setting the svg string for Canvg\n            svg = svgString\n            // An image starts loading when we assign its source.\n            img.src = `data:image/svg+xml,${  encodeURIComponent(svgString)}`\n\n        }, {\n            convertImagesToDataUris: true,\n            area: svgViewBox,\n            useComputedStyles: opt.useComputedStyles,\n            stylesheet: opt.stylesheet,\n            // A canvas doesn't like width and height to be defined as percentage for some reason. We need to replace it\n            // with desired width and height instead.\n            preserveDimensions: {\n                width: rasterSize.width,\n                height: rasterSize.height\n            }\n        })\n    }\n\n    /**\n     * @param {function} callback\n     * @param {Object} opt\n     */\n    joint.dia.Paper.prototype.toPNG = function(callback, opt) {\n\n        // options: width, height, backgroundColor\n        opt = opt || {}\n        opt.type = 'image/png'\n        this.toDataURL(callback, opt)\n    }\n\n    /**\n     * @param {function} callback\n     * @param {Object} opt\n     */\n    joint.dia.Paper.prototype.toJPEG = function(callback, opt) {\n\n        // options: width, height, backgroundColor, quality\n        opt = opt || {}\n        opt.type = 'image/jpeg'\n        this.toDataURL(callback, opt)\n    }\n\n    /**\n     * Just a little helper for quick-opening the paper as PNG in a new browser window.\n     * @param {Object} opt\n     */\n    joint.dia.Paper.prototype.openAsPNG = function(opt) {\n\n        const windowFeatures = 'menubar=yes,location=yes,resizable=yes,scrollbars=yes,status=yes'\n        const windowName = joint.util.uniqueId('png_output')\n\n        this.toPNG(function(dataURL) {\n\n            const imageWindow = window.open('', windowName, windowFeatures)\n            imageWindow.document.write(`<img src=\"${  dataURL  }\"/>`)\n\n        }, joint.util.assign({ padding: 10 }, opt))\n    }\n\n    function isCanvasSizeAllowed(width, height) {\n\n        const canvas = document.createElement('canvas')\n        canvas.width = width\n        canvas.height = height\n        const x = width - 1\n        const y = height - 1\n        const context = canvas.getContext('2d')\n        try {\n            context.fillStyle = 'rgb(1,1,1)'\n            context.fillRect(x, y, 1 , 1)\n            const rgba = context.getImageData(x, y, 1 , 1).data\n            if (rgba[0] !== 1 || rgba[1] !== 1 || rgba[2] !== 1) {\n                // Chrome, IE\n                return false\n            }\n        } catch (e) {\n            // Firefox\n            return false\n        }\n\n        return true\n    }\n\n    /**\n     * @private\n     * @param {{x:number, y:number, width:number, height:number}} clientBox\n     * @param {{width?:number, height?: number, size?:string, padding?: Object|number}} opt\n     * @returns {rect}\n     */\n    function createSVGViewBox(clientBox, opt) {\n\n        const padding = getPadding(opt)\n\n        const paddingBox = g.rect({\n            x: -padding.left,\n            y: -padding.top,\n            width: padding.left + padding.right,\n            height: padding.top + padding.bottom\n        })\n\n        if (opt.width && opt.height) {\n\n            const paddingWidth = clientBox.width + padding.left + padding.right\n            const paddingHeight = clientBox.height + padding.top + padding.bottom\n\n            paddingBox.scale(paddingWidth / opt.width, paddingHeight / opt.height)\n        }\n\n        return g.Rect(clientBox).moveAndExpand(paddingBox)\n    }\n\n    /**\n     * @private\n     * @param {string} size Size of the image could be also changed by a factor e.g, 0.5x, 2x, 4x\n     * @returns {number}\n     */\n    function getScale(size) {\n\n        let scale = 1\n\n        if (size !== undefined) {\n            scale = parseFloat(size)\n            if (!Number.isFinite(scale) || scale === 0) {\n                throw new Error(`dia.Paper: invalid raster size (${  size  })`)\n            }\n        }\n        return scale\n    }\n\n    /**\n     * @param {{width: number, height: number}} size\n     * @param {number} scale\n     * @returns {{width: number, height: number}}\n     */\n    function scaleRasterSize(size, scale) {\n\n        // the dimensions of the output image\n        return {\n            width: Math.max(Math.round(size.width * scale), 1),\n            height: Math.max(Math.round(size.height * scale), 1)\n        }\n    }\n\n    /**\n     * @private\n     * @param {{width?, height?, padding}}opt\n     * @returns {{top, bottom, left, right}}\n     */\n    function getPadding(opt) {\n\n        const padding = joint.util.normalizeSides(opt.padding)\n        if (opt.width && opt.height) {\n\n            // The content has to be at least 1px wide.\n            if (padding.left + padding.right >= opt.width) {\n                padding.left = padding.right = 0\n            }\n\n            // The content has to be at least 1px high.\n            if (padding.top + padding.bottom >= opt.height) {\n                padding.top = padding.bottom = 0\n            }\n        }\n\n        return padding\n    }\n\n    function replaceSVGImagesWithSVGEmbedded(svg) {\n\n        return svg.replace(/<image[^>]*>/g, function(imageTag) {\n\n            const match = imageTag.match(/href=\"([^\"]*)\"/)\n            const href = match && match[1]\n            const svgDataUriPrefix = 'data:image/svg+xml'\n\n            if (href && href.substr(0, svgDataUriPrefix.length) === svgDataUriPrefix) {\n                const svg = atob(href.substr(href.indexOf(',') + 1))\n                return svg.substr(svg.indexOf('<svg'))\n            }\n\n            return imageTag\n        })\n    }\n\n}(joint));\n\n(function($, V, joint) {\n\n    /*\n        Gotcha's:\n        * IE won't show background images and colors unless the \"Print background colors and images\" option is on. [1]\n        * SVG filters are removed if their ID attribute conflicts with other elements in the DOM. [2]\n\n        [1] https://support.microsoft.com/en-us/kb/296326\n        [2] https://stackoverflow.com/questions/19042282/svg-filters-after-cloning-svg\n    */\n    const MAX_ROWS = 200\n    const MAX_COLUMNS = 200\n\n    joint.dia.Paper.prototype.print = function(opt) {\n\n        const options = resolveOptions(opt)\n        const area = getArea.call(this, options)\n        const printAreaElements = []\n        let printAreaObj\n        const $body = $(document.body)\n\n        if (options.poster) {\n\n            const posterPieceSize = getPosterPieceSize(area, options.poster)\n            const pieces = splitArea(area, posterPieceSize)\n\n            for (let i = 0; i < pieces.length; i++) {\n                printAreaObj = this.preparePrintArea(pieces[i], options)\n                printAreaElements.push(printAreaObj.$el)\n            }\n        } else {\n            printAreaObj = this.preparePrintArea(area, options)\n            printAreaElements.push(printAreaObj.$el)\n        }\n\n        if (printAreaObj) {\n            injectPrintCss(printAreaObj.css, options)\n        }\n\n        options.ready(printAreaElements, function(printAreaElements) {\n\n            if (printAreaElements) {\n\n                $body.addClass('joint-print')\n\n                /*\n                    Detach the children of the paper element before adding the cloned paper element to the DOM.\n                    This is necessary because otherwise the SVG filters are removed because of duplicate element IDs.\n                */\n                const $detachedChildren = this.$el.children().detach()\n\n                printAreaElements.forEach(function($el) {\n                    $el.removeClass('preview').addClass('print-ready')\n                    $el.prependTo(document.body)\n                })\n\n                let called = false\n                var onceAfterPrint = function() {\n\n                    if (!called) {\n                        called = true\n\n                        $body.removeClass('joint-print')\n\n                        printAreaElements.forEach(function($el) {\n                            $el.remove()\n                        })\n\n                        this.$el.append($detachedChildren)\n\n                        this.trigger('afterprint', opt)\n                        $(window).off('afterprint', onceAfterPrint)\n                    }\n                }.bind(this)\n\n                $(window).one('afterprint', onceAfterPrint)\n\n                // To make sure an app won't get stuck without its original body, add a delayed version.\n                setTimeout(onceAfterPrint, 200)\n                window.print()\n            }\n\n        }.bind(this))\n    }\n\n    /**\n     * @param areaToPrint\n     * @param opt\n     * @returns {{$el: jQuery, css: Object}}\n     */\n    joint.dia.Paper.prototype.preparePrintArea = function(areaToPrint, opt) {\n\n        this.trigger('beforeprint', opt)\n\n        const $printArea = $('<div/>').addClass('printarea')\n\n        // deprecated option\n        if (opt.size) {\n            $printArea.addClass(`printarea-size-${  opt.size}`)\n        }\n\n        const scale = this.scale()\n        this.scale(1)\n\n        const $printPaper = this.$el.clone().appendTo($printArea)\n\n        const viewBox = getViewBox(this.getArea(), areaToPrint, opt)\n        const {rect} = viewBox\n        const {scaleToFit} = viewBox\n\n        $printPaper.css({\n            left: 0,\n            top: 0,\n            width: '200%',\n            height: '200%'\n        })\n\n        V($printPaper.find('svg')[0]).attr({\n            width: rect.width,\n            height: rect.height,\n            viewBox: [rect.x, rect.y, rect.width, rect.height].join(' ')\n        })\n\n        const {gridSize} = this.options\n        if (gridSize > 1) {\n            const $printPaperGrid = $printArea.find('.joint-paper-grid')\n            $printPaperGrid.css({\n                transform: ['translate(', -rect.x % gridSize, 'px, ', -rect.y % gridSize, 'px)'].join('')\n            })\n        }\n\n        this.scale(scale.sx, scale.sy)\n\n        $printArea.addClass('preview')\n        return {\n            $el: $printArea,\n            css: {\n                width: `${rect.width  }px`,\n                height: `${rect.height  }px`,\n                transform: `scale(${  scaleToFit  })`,\n                'transform-origin': '0 0'\n            }\n        }\n    }\n\n    const objectToCss = function(obj) {\n\n        return `${Object.keys(obj).map(function(key) {\n            return `${key  }:${  obj[key]}`\n        }).join(';')  };`\n    }\n\n    const getSheetSizePx = function(sheet, margin) {\n\n        const widthReduction = convert.toPx(margin.left + margin.right, margin.unit)\n        const heightReduction = convert.toPx(margin.top + margin.bottom, margin.unit)\n\n        return {\n            width: Math.max(convert.toPx(sheet.width, sheet.unit) - widthReduction, 1),\n            height: Math.max(convert.toPx(sheet.height, sheet.unit) - heightReduction, 1)\n        }\n    }\n\n    var getViewBox = function(paperAreaBBox, areaToPrint, opt) {\n\n        const rect = g.Rect({\n            x: (areaToPrint.x - paperAreaBBox.x),\n            y: (areaToPrint.y - paperAreaBBox.y),\n            width: areaToPrint.width,\n            height: areaToPrint.height\n        })\n\n        const margin = joint.util.normalizeSides(opt.margin)\n        const {sheet} = opt\n        margin.unit = opt.marginUnit\n        sheet.unit = opt.sheetUnit\n        const sheetSizePx = getSheetSizePx(sheet, margin)\n\n        const viewBoxRatio = rect.width / rect.height\n        const sheetRatio = sheetSizePx.width / sheetSizePx.height\n        let scaleToFit\n\n        if (viewBoxRatio > sheetRatio) {\n            scaleToFit = sheetSizePx.width / rect.width\n        } else {\n            scaleToFit = sheetSizePx.height / rect.height\n        }\n\n        return { rect: rect, scaleToFit: scaleToFit }\n    }\n\n    var resolveOptions = function(opt) {\n\n        const options = joint.util.defaultsDeep({}, opt, {\n            area: null,\n            poster: false,\n            sheet: {\n                width: 210,\n                height: 297\n            },\n            // support mm, in, pt, pc, cm,\n            // 1 in = 2.54cm = 25.4mm = 72pt = 6pc\n            sheetUnit: 'mm',\n            ready: function($printArea, readyToPrint) {\n                readyToPrint($printArea)\n            },\n\n            margin: 0.4,\n            marginUnit: 'in',\n            // applicable only if area is not defined\n            padding: 5\n\n            // @deprecated - backward compatibility\n            // For setting actual paper print size via CSS.\n            // Adds another class to printarea <div/> like `printarea-size-a4`.\n            //\n            // CSS:\n            // .printarea-size-a4 {\n            //      width: 210mm !important;\n            //      height: 297mm !important;\n            // }\n\n            // size: 'a4'\n        })\n\n        if (!options.area) {\n            options.printingAll = true\n        }\n\n        return options\n    }\n\n    const injectCss = function(cssString) {\n\n        const stylesCssEl = $('#print-styles')\n\n        const style = `<style type=\"text/css\" id=\"print-styles\">${  cssString  }</style>`\n        if (stylesCssEl.length) {\n            stylesCssEl.html(cssString)\n        } else {\n            $('head').append(style)\n        }\n    }\n\n    var injectPrintCss = function(printAreaObjCss, opt) {\n\n        const printAreaCssValue = objectToCss(printAreaObjCss)\n        const margin = joint.util.normalizeSides(opt.margin)\n        const unit = opt.marginUnit\n\n        const pageMarginCssValue = [margin.top + unit, margin.right + unit, margin.bottom + unit, margin.left + unit].join(' ')\n        const orientation = opt.sheet.width > opt.sheet.height ? 'landscape' : 'portrait'\n\n        const printCss = [\n            '@media print {',\n            '.printarea.print-ready {',\n            printAreaCssValue,\n            '}',\n            '@page {',\n            `margin:${  pageMarginCssValue  };`,\n            `size:${  orientation  };`,\n            '}',\n            '}',\n            '.printarea.preview {',\n            printAreaCssValue,\n            '}'\n        ]\n        injectCss(printCss.join(''))\n    }\n\n    var getArea = function(opt) {\n\n        let {area} = opt\n        // backward compatibility\n        if (!area) {\n\n            const padding = joint.util.normalizeSides(opt.padding)\n            area = this.getContentArea().moveAndExpand({\n                x: -padding.left,\n                y: -padding.top,\n                width: padding.left + padding.right,\n                height: padding.top + padding.bottom\n            })\n        }\n\n        return area\n    }\n\n    var splitArea = function(area, chunkSize) {\n\n        const w = chunkSize.width\n        const h = chunkSize.height\n\n        let chunk\n        const res = []\n\n        let rowsHeight = 0\n        let colsWidth = 0\n        let rows = 0\n        let columns = 0\n\n        while (rowsHeight < area.height) {\n            while (colsWidth < area.width) {\n                chunk = g.Rect(area.x + colsWidth, area.y + rowsHeight, w, h)\n                res.push(chunk)\n                colsWidth += w\n                if (columns > MAX_COLUMNS) {\n                    break\n                }\n                columns++\n            }\n            colsWidth = 0\n            columns = 0\n            rowsHeight += h\n            if (rows > MAX_ROWS) {\n                break\n            }\n            rows++\n        }\n\n        return res.reverse()\n    }\n\n    var getPosterPieceSize = function(area, opt) {\n\n        const pieceSize = {\n            width: opt.width,\n            height: opt.height\n        }\n\n        if (!pieceSize.width) {\n            pieceSize.width = Math.ceil(area.width / (opt.columns || 1))\n        }\n\n        if (!pieceSize.height) {\n            pieceSize.height = Math.ceil(area.height / (opt.rows || 1))\n        }\n\n        return pieceSize\n    }\n\n    var convert = {\n\n        supportedUnits: {\n            px: function(value) {\n                return value\n            },\n            mm: function(value) {\n                return this.millimeterSize * value\n            },\n            cm: function(value) {\n                return (this.millimeterSize * value) * 10\n            },\n            in: function(value) {\n                return this.millimeterSize * value * 25.4\n            },\n            pt: function(value) {\n                return this.millimeterSize * ((value * 25.4) / 72)\n            },\n            pc: function(value) {\n                return this.millimeterSize * ((value * 25.4) / 6)\n            }\n        },\n\n        measureMillimeter: function() {\n\n            const box = $('<div/>').css({\n                display: 'inline-block',\n                position: 'absolute',\n                left: -5000,\n                width: '1mm',\n                height: '1mm'\n            }).appendTo(document.body)\n\n            const width = box.width()\n            box.remove()\n\n            return width\n        },\n\n        toPx: function(value, unit) {\n\n            if (!this.millimeterSize) {\n                this.millimeterSize = this.measureMillimeter()\n            }\n\n            unit = (unit || '').toLowerCase()\n\n            if (!this.supportedUnits[unit]) {\n                throw new Error(`Unsupportted unit ${  unit}`)\n            }\n\n            return this.supportedUnits[unit].call(this, value)\n        }\n    }\n\n})($, V, joint)\n\n/* eslint no-console: 'off' */\n\n// Channel - Graph synchronization plugin.\n// =======================================\n\n// The synchronization protocol is inspired by the paper\n// High-Latency, Low-Bandwidth Windowing in the Jupiter Collaboration System; 1995, Nichols, Curtis.\n\n// Basic usage\n// -----------\n\n// Server: (`port` is passed)\n// var channel = new joint.com.Channel({ graph: graph, port: 1234 });\n\n// Client: (`url` is passed)\n// var channel = new joint.com.Channel({ graph: graph, url: 'ws://localhost:1234' });\n\n// ChannelHub (a.k.a. rooms).\n// --------------------------\n\n// Client:\n// var channel1 = new joint.com.Channel({ graph: graph1, url: 'ws://localhost:1234', query: { room: 'A' } });\n// Another client:\n// var channel2 = new joint.com.Channel({ graph: graph2, url: 'ws://localhost:1234', query: { room: 'A' } });\n// Yet another client:\n// var channel3 = new joint.com.Channel({ graph: graph3, url: 'ws://localhost:1234', query: { room: 'B' } });\n\n// Server (one channel/graph per room):\n// var channels = {};\n// var channelHub = new joint.com.ChannelHub({ port: 4141 });\n// channelHub.route(function(req, callback) {\n\n//     var query = JSON.parse(req.query.query);\n//     var channel = channels[query.room] || null;\n\n//     if (!channel) {\n//        channel = channels[query.room] = new joint.com.Channel({ graph: new joint.dia.Graph });\n//     }\n\n//     // If an error occurred, call the callback function with the error as the first argument.\n//     // callback(new Error('Some error has occurred.'));\n\n//     // Otheriwse, call the callback function with the channel as the second argument.\n//     callback(null, channel);\n// });\n\n// Notifications (non-reliable but faster communication).\n// ------------------------------------------------------\n\n// channelClient1.on('telepointer', function(data) {  renderPointer(data.x, data.y, data.color) });\n// channelClient2.notify('telepointer', { x: 50, y: 50, color: 'red' });\n\nif (typeof exports === 'object') {\n\n    var WebSocketServer = require('ws').Server\n    var WebSocket = require('ws')\n    var url = require('url')\n}\n\n// In the browser, these variables are set to undefined because of JavaScript hoisting.\n// In that case, should grab them from the window object.\nWebSocket = WebSocket || (typeof window !== 'undefined' && window.WebSocket)\n\njoint.com = joint.com || {}\n\n// Channel\n// =======\n\njoint.com.Channel = function(opt) {\n\n    this.options = opt\n\n    if (!this.options || !this.options.graph) throw new Error('Channel: missing a graph.')\n\n    // Time-to-live of a site. If `ttl` for a site reaches zero, such site is considered dead\n    // and the channel removes it from its register (`this.sites` and `this.state`).\n    this.options.ttl = this.options.ttl || 60\n\n    // Interval in ms in which a health check is performed on all the sites. Each health\n    // check decreases the `ttl` for a site if the site socket is considered disconnected.\n    // If the site socket is connected, the `ttl` is returned to its original value.\n    // The default is a health check performed every 1 minute with defualt ttl 60 meaning\n    // that if a socket of a site was found disconnected every minute of an hour, then such site\n    // is considered stale and therefore removed from the channel register.\n    this.options.healthCheckInterval = this.options.healthCheckInterval || (1000 * 60 * 60)\n\n    // If a connection got closed, try to reconnect every `options.reconnectInterval` milliseconds.\n    // The default is 10s.\n    this.options.reconnectInterval = this.options.reconnectInterval || 10000\n\n    // Set to `false` if you don't want newly connected clients to receive the whole graph from the server.\n    // Default is `true`. Setting this to `false` is useful if it is the client who has the newest\n    // graph, not the server. For example, if we have an application that loads a graph via AJAX on the\n    // client side and we then want other clients to connect, we don't want those clients\n    // to recieve an empty graph from the ChannelHub.\n    this.options.serverShouldSendGraph = this.options.serverShouldSendGraph === undefined ? true : this.options.serverShouldSendGraph\n\n    // Servers do not have a `url` options but rather a `port` they listen on.\n    this._isClient = !!this.options.url\n\n    // A list of sockets for all the clients connected to this channel.\n    this._clients = []\n\n    // A list of operations waiting to be sent. This queue gets populated\n    // when the channel gets paused.\n    this.messageQueue = []\n\n    // This site ID.\n    this.id = this.options.id || (this._isClient ? 'c_' : 's_') + joint.util.uuid()\n\n    // State vector. Number of operations generated and processed for each connected channel including\n    // the channel itself. This state vector is sent witch each operation.\n    this.state = {}\n    this.state[this.id] = 0\n\n    // Connected channels and the channel itself. Includes the `outgoing` queue and the current site socket.\n    // This is also useful for recognizing if a site got re-connected or if it is a completely new site.\n    this.sites = {}\n    this.sites[this.id] = { socket: undefined, outgoing: [], ttl: this.options.ttl }\n\n    this.initialize()\n}\n\njoint.util.assign(joint.com.Channel.prototype, Backbone.Events)\n\n// Establish a connection between client and server and listen on graph changes.\njoint.com.Channel.prototype.initialize = function() {\n\n    this.options.graph.on('all', this.onGraphChange.bind(this))\n\n    if (this._isClient) {\n\n        this.connectClient()\n\n    } else if (this.options.port) {\n\n        this.server = new WebSocketServer({ port: this.options.port })\n        this.server.on('connection', this.onConnection.bind(this))\n    }\n\n    if (!this._isClient) {\n\n        this._healthCheckInterval = setInterval(this.healthCheck.bind(this), this.options.healthCheckInterval)\n    }\n}\n\n// Connect client to the server defined in the `options.url`.\njoint.com.Channel.prototype.connectClient = function() {\n\n    const url = `${this.options.url  }/?channelId=${  this.id  }&state=${  JSON.stringify(this.state)  }${this.options.query ? `&query=${  JSON.stringify(this.options.query)}` : ''}`\n\n    if (this.options.debugLevel > 0) this.log('connectClient', url)\n\n    // Send current `state` together with this `channelId` to the server.\n    const socket = new WebSocket(url)\n    socket.onopen = this.onConnection.bind(this, socket)\n    socket.onclose = this.onClose.bind(this, socket)\n}\n\n// Close all sockets. This effectively shuts down the channel.\njoint.com.Channel.prototype.close = function() {\n\n    if (this._reconnectTimeout) clearTimeout(this._reconnectTimeout)\n    if (this._healthCheckInterval) clearInterval(this._healthCheckInterval)\n\n    // Mark the channel as closed. This will prevent future reconnection (see `onClose()`).\n    // Note that the `onClose()` is called after we close the client socket in the following lines.\n    this._closed = true\n\n    joint.util.forIn(this.sites, function(site) {\n\n        if (site.socket) site.socket.close()\n    })\n\n    if (this.server) this.server.close()\n}\n\n// Checks wheater a site is alive (it's socket is connected). If it is not alive, decreate\n// the site `ttl`. If the `ttl` of a site reaches zero, remove the site and its state from the register.\njoint.com.Channel.prototype.healthCheck = function() {\n\n    if (this.options.debugLevel > 0) {\n\n        const message = Object.keys(this.sites).reduce(function(res, site) {\n            res[site] = this[site].ttl\n            return res\n        }.bind(this.sites), {})\n\n        this.log('healthCheck', message)\n    }\n\n    joint.util.forIn(this.sites, function(site, channelId) {\n\n        // Do not health check the channel itself.\n        if (channelId === this.id) return\n\n        // readyState === 1 => OPEN socket.\n        if (!site.socket || site.socket.readyState !== 1) {\n            site.ttl -= 1\n        } else {\n            site.ttl = this.options.ttl\n        }\n\n        if (site.ttl <= 0) {\n\n            this.sites = joint.util.omit(this.sites, channelId)\n            this.state = joint.util.omit(this.state, channelId)\n        }\n\n    }.bind(this))\n}\n\n// Handle a client connection to the server.\njoint.com.Channel.prototype.onConnection = function(socket) {\n\n    // Store the socket to the internal list of clients. This is useful for cleaning up sockets\n    // from clients that have re-connected.\n    this._clients.push(socket)\n\n    this.trigger('open', socket)\n\n    if (this._isClient) {\n\n        this.sites[this.id].socket = socket\n        socket.onmessage = function(evt) { this.onMessage(socket, evt.data) }.bind(this)\n\n    } else {\n\n        // The required query fields from clients are `channelId` and `state` object JSON stringified.\n        const upgradeReqUrl = url.parse(socket.upgradeReq.url, true)\n        const {channelId} = upgradeReqUrl.query\n\n        if (this.sites[channelId]) {\n            // Re-connected site.\n            // @TODO: send the site ops from the message queue that the client has not yet seen.\n            this.sites[channelId].socket = socket\n\n        } else {\n\n            if (this.debugLevel > 1) this.log('new_site', channelId)\n\n            // New site.\n            this.sites[channelId] = { socket: socket, outgoing: [], ttl: this.options.ttl }\n            this.state[channelId] = 0\n\n            if (this.options.serverShouldSendGraph) {\n\n                // Send the new site the whole graph.\n                const op = {\n                    channelId: this.id,\n                    state: JSON.parse(JSON.stringify(this.state)),\n                    action: 'graph',\n                    graph: this.options.graph.toJSON()\n                }\n\n                this.messageQueue.push({ type: 'op', data: op, source: this.id, target: [channelId] })\n                this.send()\n            }\n        }\n\n        socket.on('message', this.onMessage.bind(this, socket))\n        socket.on('close', this.onClose.bind(this, socket))\n    }\n}\n\n// Handle a client disconnection.\njoint.com.Channel.prototype.onClose = function(socket) {\n\n    const index = this._clients.indexOf(socket)\n    if (index !== -1) {\n        this._clients.splice(index, 1)\n    }\n\n    // If the connection got closed, try to reconnect every 10s or every `options.reconnectInterval` milliseconds.\n    if (this._isClient && !this._closed) {\n\n        if (this._reconnectTimeout) clearTimeout(this._reconnectTimeout)\n\n        this._reconnectTimeout = setTimeout(this.connectClient.bind(this), this.options.reconnectInterval)\n    }\n\n    this.trigger('close', socket)\n}\n\n// Remote update.\njoint.com.Channel.prototype.onMessage = function(socket, message) {\n\n    this.trigger('message:received', message)\n\n    if (this.options.debugLevel > 1) this.log('message', message)\n\n    try {\n        message = JSON.parse(message)\n    } catch (err) {\n        // This should never happen.\n        return console.error('Channel: message parsing failed.', err)\n    }\n\n    if (message.type == 'notification') {\n        // Notification. If a notification is received, the event it carries is triggered on the channel.\n        // If a server receives a notification, it broadcasts it to all the clients except the one\n        // that sent the notification.\n\n        this.trigger(message.data.event, message.data.data)\n        return this.sendNotification(message)\n    }\n\n    let op = message.data\n\n    // Receive the op at every site.\n    // Note that in case of a client, there is only one site.\n    // In case of the server, there is the server's site itself and sites for all the clients.\n    let mySite; let otherSite\n\n    if (this._isClient) {\n\n        // Transform the operation in the client's state. Note that clients do not store\n        // the state of the server (or even other clients) but only their own state.\n        mySite = this.sites[this.id]\n        op = this.receive(mySite, this.id, op)\n\n    } else {\n\n        // Send and transform the operation in the state of the sending client.\n        otherSite = this.sites[op.channelId]\n        op = this.receive(otherSite, op.channelId, op)\n\n        // Now send the transformed operation to my own state.\n        mySite = this.sites[this.id]\n        op = this.receive(mySite, this.id, op)\n    }\n\n    // Update the version tuple. Note that if the operation action was the whole graph, then we\n    // need to update the state of the server (that the client keeps track of) to the state\n    // that was sent with the graph operation as there might have been much more than one operation\n    // applied on the server before the graph was sent.\n    if (op.action === 'graph') {\n\n        this.state[op.channelId] = op.state[op.channelId]\n\n    } else {\n\n        this.state[op.channelId] = (this.state[op.channelId] || 0) + 1\n    }\n\n    if (this.options.debugLevel > 1) this.log('new state', this.state)\n\n    // Execute the operation. Note that we have to execute after we have update the state as\n    // executing one operation can lead to generating other operations (see e.g. `disconnectLinks` in `joint.dia.graph`).\n    this.execute(op)\n\n    // Update the `outgoing` queue in all the sites except my own and the one the operation\n    // came from as these two cases we handled already (see above). The reason we do this here\n    // is that we don't want the operation to be transformed again.\n    joint.util.forIn(this.sites, function(site, channelId) {\n\n        if (channelId !== this.id && channelId !== op.channelId) {\n\n            this.receive(site, channelId, op)\n        }\n    }.bind(this))\n\n    if (!this._isClient) {\n\n        // Broadcast the transformed operation to all the other sites.\n        message.op = op\n        this.messageQueue.push(message)\n        this.broadcast(message)\n    }\n\n    this.trigger('message:processed', message)\n}\n\n// Receive an `op` at `site` with id `channelId`. Transform the `op` and Update the outgoing queue\n// accordingly. Return the transformed `op`.\njoint.com.Channel.prototype.receive = function(site, channelId, op) {\n\n    if (!site) return op\n\n    if (this.options.debugLevel > 1) this.log('receive', channelId, op)\n    if (this.options.debugLevel > 1) this.log('outgoing', site.outgoing)\n\n    // Discard acknowledged.\n    site.outgoing = site.outgoing.filter(function(oldOp) {\n\n        return oldOp.state[oldOp.channelId] >= (op.state[oldOp.channelId] || 0)\n    })\n\n    if (this.options.debugLevel > 1) this.log('outgoing.length', site.outgoing.length)\n\n    // Transform and store intermediate results to `outgoing` for next transformations.\n    for (let i = 0; i < site.outgoing.length; i++) {\n        const oldOp = site.outgoing[i]\n        const transformResult = this.transform(op, oldOp)\n        op = transformResult[0]\n        site.outgoing[i] = transformResult[1]\n    }\n\n    return op\n}\n\n// Transform operations `o1` and `o2`. Operation `o1` is the incoming operation. `o2` is taken from the outgoing queue.\n// The first item of the returned array is the operation that will be applied, the second is an operation\n// that will replace `o2` in outgoing (and will be used in future transformations).\njoint.com.Channel.prototype.transform = function(o1, o2) {\n\n    if (this.options.debugLevel > 1) this.log('transform', o1, o2)\n\n    // Note that the other way round is not neccessary to cover as if the incoming op is remove\n    // and the the previous operation was change:target to the removed element, then the remove\n    // automatically disconnects the link (see `disconnectLinks: true` in `execute()`).\n    if (o1.action === 'change:target' && o2.action === 'remove') {\n\n        if (o1.cell.target.id === o2.cell.id) {\n\n            o1.cell.target = { x: 0, y: 0 }\n        }\n    }\n\n    if (o1.action === 'change:source' && o2.action === 'remove') {\n\n        if (o1.cell.source.id === o2.cell.id) {\n\n            o1.cell.source = { x: 0, y: 0 }\n        }\n    }\n\n    return [o1, o2]\n}\n\njoint.com.Channel.prototype.execute = function(op) {\n\n    let cell\n\n    switch (op.action) {\n\n        case 'add':\n            this.options.graph.addCell(op.cell, { remote: true })\n            break\n\n        case 'remove':\n            cell = this.options.graph.getCell(op.cell.id)\n            // Do not remove associated links (`disconnectLinks: true`) as these removals arrive as separate operations.\n            if (cell) cell.remove({ remote: true, disconnectLinks: true })\n            break\n\n        case 'graph':\n            // Complete graph replacement.\n            this.options.graph.fromJSON(op.graph)\n            break\n\n        default:\n            var attribute = op.action.substr('change:'.length)\n            cell = this.options.graph.getCell(op.cell.id)\n            if (cell) cell.set(attribute, op.cell[attribute], { remote: true })\n            break\n    }\n}\n\n// Broadcast `message` to all the sites except the one that send the message (source site).\njoint.com.Channel.prototype.broadcast = function(message) {\n\n    if (this._isClient) {\n        message.target = Object.keys(this.sites)\n    } else {\n        message.target = Object.keys(joint.util.omit(this.sites, this.id, message.source))\n    }\n\n    this.send()\n}\n\n// Send all operations from the `messageQueue` to their intended recipients.\njoint.com.Channel.prototype.send = function() {\n\n    if (this._paused) return\n\n    // Go through the messages one by one and check if they can be sent. If yes, send the message\n    // and remove it from the `messageQueue`. If not, keep the message in the `messageQueue` and break up\n    // from the function.\n\n    // Indexes of messages from `messageQueue`.\n    const toRemove = []\n\n    for (let i = 0; i < this.messageQueue.length; i++) {\n        const m = this.messageQueue[i]\n        if (this.sendMessage(m)) {\n            // Mark a message that was successfully sent for removal.\n            toRemove.push(i)\n        }\n    }\n\n    // Remove all the successfully sent messages.\n    toRemove.forEach(function(msgIdx) {\n        this.messageQueue.splice(msgIdx, 1)\n    }, this)\n}\n\n// Send one message to its targets.\njoint.com.Channel.prototype.sendMessage = function(m) {\n\n    if (this.debugLevel > 1) this.log('sendMessage', m)\n\n    const successTargets = []\n\n    m.target.forEach(function(target, idx) {\n\n        const recievingSite = this.sites[target]\n        // @assert recievingSite.socket\n\n        // Check if the message can be safely send to such a target. If yes, mark\n        // the target for removal so that next time we don't send the message to this target again.\n        // If the recieving site does not exist anymore, consider the message was successfully sent.\n        if (!recievingSite) return successTargets.push(idx)\n        if (!recievingSite.socket) return\n        // readyState constants: See https://developer.mozilla.org/en-US/docs/Web/API/WebSocket#Ready_state_constants.\n        // 1 === OPEN (The connection is open and ready to communicate.)\n        if (recievingSite.socket.readyState !== 1) return\n\n\n        if (this.debugLevel > 1) this.log('sendMessage', target, m)\n\n        recievingSite.socket.send(JSON.stringify(m))\n        successTargets.push(idx)\n\n    }, this)\n\n    // Remove all the targets to which the message was successfully sent.\n    successTargets.forEach(function(targetIdx) {\n        m.target.splice(targetIdx, 1)\n    })\n\n    // Return `true` if the message was successfully sent to all the targets.\n    if (!m.target.length) return true\n    return false\n}\n\njoint.com.Channel.prototype.log = function(keyword, args) {\n\n    const text = `Channel [${  this.id  }] ${  keyword.toUpperCase()  }: `\n\n    console.log.apply(console, [text].concat(Array.prototype.slice.call(arguments, 1)))\n}\n\n// Pause the channel. All messages that are supposed to be sent from now one will end up in the\n// `messageQueue` until the channel is unpaused.\njoint.com.Channel.prototype.pause = function() {\n\n    this._paused = true\n}\n\n// Unpause the channel causing all the messages from `messageQueue` to be send immediately.\njoint.com.Channel.prototype.unpause = function() {\n\n    this._paused = false\n    this.send()\n}\n\n// Notify everyone about the `event` carrying `data`.\njoint.com.Channel.prototype.notify = function(event, data) {\n\n    const message = {\n        type: 'notification',\n        source: this.id,\n        data: { event: event, data: data }\n    }\n    this.sendNotification(message)\n}\n\n// Send notification is like broadcast with send combined except that the message does not go\n// to the `messageQueue`. Notifications are not like ops, OT is not involved. They are useful though for\n// things like telepointers and other messages which don't require such a safety as ops.\njoint.com.Channel.prototype.sendNotification = function(message) {\n\n    if (this._isClient) {\n        message.target = Object.keys(this.sites)\n    } else {\n        message.target = Object.keys(joint.util.omit(this.sites, this.id, message.source))\n    }\n\n    this.sendMessage(message)\n}\n\n// Local update.\n// Broadcast the operation, store it to the `outgoing` queue and increment this site state.\njoint.com.Channel.prototype.onGraphChange = function(eventName, cell, graph, options) {\n\n    // If this change is a result of executing an operation sent by others, do not broadcast.\n    if (options && options.remote) return\n\n    // We're only interested in `add`, `remove` and `change:` events.\n    const isInteresting = eventName === 'add' || eventName === 'remove' || eventName.substr(0, 'change:'.length) === 'change:'\n    if (!isInteresting) return\n\n    // Generate operation.\n    const op = {\n        channelId: this.id,\n        state: JSON.parse(JSON.stringify(this.state)),\n        action: eventName,\n        cell: cell.toJSON()\n    }\n\n    // Broadcast message with the operation.\n    const message = { type: 'op', data: op, source: this.id }\n\n    if (this.options.debugLevel > 1) this.log('generate', message)\n\n    this.messageQueue.push(message)\n    this.broadcast(message)\n\n    // Store the `op` for later transformations.\n    this.sites[this.id].outgoing.push(op)\n\n    // Move down the state space.\n    this.state[this.id]++\n}\n\n// ChannelHub\n// ==========\n\njoint.com.ChannelHub = function(opt) {\n\n    this.options = opt\n\n    if (!this.options.port) throw new Error('ChannelHub: missing a port.')\n\n    this.initialize()\n}\n\njoint.util.assign(joint.com.ChannelHub.prototype, Backbone.Events)\n\njoint.com.ChannelHub.prototype.initialize = function() {\n\n    this.server = new WebSocketServer({ port: this.options.port })\n    this.server.on('connection', this.onConnection.bind(this))\n}\n\njoint.com.ChannelHub.prototype.onConnection = function(socket) {\n\n    // The required query fields from clients are `channelId` and `state` object JSON stringified.\n    const upgradeReqUrl = url.parse(socket.upgradeReq.url, true)\n    const req = { query: upgradeReqUrl.query }\n\n    if (!this.router) throw new Error('ChannelHub: missing a router.')\n\n    let called = false\n\n    const channel = this.router(req, function(error, channel) {\n\n        if (error) {\n            throw new Error(error)\n        }\n\n        if (channel && !called) {\n            channel.onConnection(socket)\n            called = true\n        }\n    })\n\n    // For backwards compatibility.\n    // This allows the previous synchronous behavior.\n    if (channel instanceof joint.com.Channel) {\n        channel.onConnection(socket)\n        called = true\n    }\n}\n\njoint.com.ChannelHub.prototype.route = function(router) {\n\n    this.router = router\n}\n\n// Shut down the server.\njoint.com.ChannelHub.prototype.close = function() {\n\n    this.server.close()\n}\n\n// Dijkstra's shortest path algorithm.\n// ===================================\n\n// Implemented using a priority queue.\n// Time complexity: O(|E| + |V| log |V|)\n\njoint.alg = joint.alg || {}\n\n// `adjacencyList` is an object where keys are nodes and values are\n// lists of neighbours.\n// `source` is the id of the source node from which shortest paths will be computed.\n// `weight` is a function that returns a distance between two nodes.\njoint.alg.Dijkstra = function(adjacencyList, source, weight) {\n\n    weight = weight || function(u, v) { return 1 }\n\n    const dist = {}\n    dist[source] = 0\n\n    const previous = {}\n    const Q = new joint.alg.PriorityQueue\n\n    for (var v in adjacencyList) {\n\n        if (v !== source) {\n            dist[v] = Infinity\n        }\n        Q.insert(dist[v], v, v)\n    }\n\n    let u; let neighbours; let i; let alt\n    const scanned = {}\n    while (!Q.isEmpty()) {\n        u = Q.remove()\n        scanned[u] = true\n        neighbours = adjacencyList[u] || []\n        for (i = 0; i < neighbours.length; i++) {\n            v = neighbours[i]\n            if (!scanned[v]) {\n                alt = dist[u] + weight(u, v)\n                if (alt < dist[v]) {\n                    dist[v] = alt\n                    previous[v] = u\n                    Q.updatePriority(v, alt)\n                }\n            }\n        }\n    }\n\n    return previous\n}\n\n// PriorityQueue - using binary heap.\n// ==================================\n\n// Time complexity\n// ---------------\n\n// create: O(n)\n// insert: O(log n)\n// peek: O(1)\n// peekPriority: O(1)\n// remove: O(log n)\n// isEmpty: O(1)\n\njoint.alg = joint.alg || {}\n\n// Public interface.\n// -----------------\n\njoint.alg.PriorityQueue = function(opt) {\n\n    opt = opt || {}\n\n    this.comparator = opt.comparator || function(a, b) {\n        return a - b\n    }\n\n    // `index` is a map of node ID's (if provided in insert op) to their indexes in the `data` array.\n    // This is necessary in order to implement `updatePriority` operation\n    // (better known as \"decreaseKey\"). The map is here so that we\n    // can find the index of the node object. We assume this lookup has\n    // O(log n) time complexity.\n    this.index = {}\n    this.data = opt.data || []\n    this.heapify()\n}\n\njoint.alg.PriorityQueue.prototype.isEmpty = function() {\n\n    return this.data.length === 0\n}\n\njoint.alg.PriorityQueue.prototype.insert = function(priority, value, id) {\n\n    const node = { priority: priority, value: value }\n    this.data.push(node)\n    const index = this.data.length - 1\n    if (id) {\n        node.id = id\n        this.index[id] = index\n    }\n    this.bubbleUp(index)\n}\n\njoint.alg.PriorityQueue.prototype.peek = function() {\n\n    return this.data[0] && this.data[0].value\n}\n\njoint.alg.PriorityQueue.prototype.peekPriority = function() {\n\n    return this.data[0] && this.data[0].priority\n}\n\njoint.alg.PriorityQueue.prototype.updatePriority = function(id, priority) {\n\n    const index = this.index[id]\n    if (index === null || typeof index === 'undefined') {\n        throw new Error(`Node with id ${  id  } was not found in the heap.`)\n    }\n\n    const {data} = this\n    const oldPriority = data[index].priority\n    const comp = this.comparator(priority, oldPriority)\n    if (comp < 0) {\n\n        data[index].priority = priority\n        this.bubbleUp(index)\n\n    } else if (comp > 0) {\n\n        data[index].priority = priority\n        this.bubbleDown(index)\n    }\n}\n\njoint.alg.PriorityQueue.prototype.remove = function() {\n\n    const {data} = this\n    const peek = data[0]\n    const last = data.pop()\n\n    this.index[data.length] = null\n\n    if (data.length > 0) {\n\n        data[0] = last\n        if (last.id) {\n            this.index[last.id] = 0\n        }\n        this.bubbleDown(0)\n    }\n\n    return peek && peek.value\n}\n\n// Private.\n// --------\n\njoint.alg.PriorityQueue.prototype.heapify = function() {\n\n    for (let i = 0; i < this.data.length; i++) {\n\n        this.bubbleUp(i)\n    }\n}\n\njoint.alg.PriorityQueue.prototype.bubbleUp = function(pos) {\n\n    let parent\n    let aux\n    const {data} = this\n\n    while (pos > 0) {\n\n        parent = (pos - 1) >>> 1\n        if (this.comparator(data[pos].priority, data[parent].priority) < 0) {\n\n            aux = data[parent]\n            data[parent] = data[pos]\n            if (data[pos].id) {\n                this.index[data[pos].id] = parent\n            }\n            data[pos] = aux\n            if (data[pos].id) {\n                this.index[data[pos].id] = pos\n            }\n            pos = parent\n\n        } else {\n            break\n        }\n    }\n}\n\njoint.alg.PriorityQueue.prototype.bubbleDown = function(pos) {\n\n    const {data} = this\n    const last = data.length - 1\n    while (true) {\n\n        const left = (pos << 1) + 1\n        const right = left + 1\n        let minIndex = pos\n\n        if (left <= last && this.comparator(data[left].priority, data[minIndex].priority) < 0) {\n\n            minIndex = left\n        }\n        if (right <= last && this.comparator(data[right].priority, data[minIndex].priority) < 0) {\n\n            minIndex = right\n        }\n        if (minIndex !== pos) {\n\n            const aux = data[minIndex]\n            data[minIndex] = data[pos]\n            if (data[pos].id) {\n                this.index[data[pos].id] = minIndex\n            }\n            data[pos] = aux\n            if (data[pos].id) {\n                this.index[data[pos].id] = pos\n            }\n            pos = minIndex\n\n        } else {\n            break\n        }\n    }\n}\n\n// joint.storage.Local stores graphs to the HTML 5 localStorage.\n// The API is inspired by the great MongoDB database.\n\n// Example usage:\n//     var graph = new joint.dia.Graph;\n//     (new joint.shapes.basic.Rect).addTo(graph);\n//     joint.storage.Local.insert('graphs', graph);\n//     joint.storage.Local.find('graphs', {}, function(err, graphs) {});\n//     joint.storage.Local.remove('graphs', {}, function(err) {});\n\njoint.storage = joint.storage || {}\n\njoint.storage.Local = {\n\n    prefix: 'joint.storage',\n\n    // Store a document `doc` to the `collection` in localStorage.\n    // `callback` has the following signature: `callback(err, doc)` where\n    // `doc` is the inserted document.\n    insert: function(collection, doc, callback) {\n\n        const id = doc.id || joint.util.uuid()\n\n        const index = this.loadIndex(collection)\n        if (index.keys.indexOf(id) === -1) {\n            index.keys.push(id)\n        }\n\n        this.setItem(this.docKey(collection, id), doc)\n        this.setItem(this.indexKey(collection), index)\n\n        // Don't add the `id` to the document if it wasn't there.\n        this.callback(callback, null, joint.util.assign({}, doc, { id: id }))\n    },\n\n    // Find a document in `collection`.\n    // `query` can currently be either empty in which case all the\n    // documents from the `collection` are returned or it can contain `id`\n    // of a document in which case only a document with that `id` is returned.\n    // `callback` signature is: `callback(err, docs)`.\n    find: function(collection, query, callback) {\n\n        const index = this.loadIndex(collection)\n        const docs = []\n\n        if (joint.util.isEmpty(query)) {\n\n            // Find all documents in the collection.\n            index.keys.forEach(function(id) {\n\n                const doc = this.getItem(this.docKey(collection, id))\n                if (!doc) {\n\n                    this.callback(callback, new Error(`Storage incosistency. No document found for an ID ${  id  } from index.`))\n                }\n\n                docs.push(doc)\n\n            }, this)\n\n            this.callback(callback, null, docs)\n\n        } else if (query.id) {\n\n            const doc = this.getItem(this.docKey(collection, query.id))\n            this.callback(callback, null, doc ? [doc] : [])\n\n        } else {\n\n            // Other queries supported yet.\n            this.callback(callback, null, [])\n        }\n    },\n\n    // Remove a document from the `collection`. `query` can currently be either empty\n    // in which case all the documents from the `collection` are removed\n    // or it can contain an `id` of the document to be removed.\n    // `callback` signature is: `callback(err)`.\n    remove: function(collection, query, callback) {\n\n        const index = this.loadIndex(collection)\n\n        if (joint.util.isEmpty(query)) {\n\n            index.keys.forEach(function(id) {\n\n                localStorage.removeItem(this.docKey(collection, id))\n\n            }, this)\n\n            localStorage.removeItem(this.indexKey(collection))\n            this.callback(callback, null)\n\n        } else if (query.id) {\n\n            index.keys = index.keys.filter(function(key) {\n                return key !== query.id\n            })\n\n            localStorage.removeItem(this.docKey(collection, query.id))\n            this.setItem(this.indexKey(collection), index)\n            this.callback(callback, null)\n        }\n    },\n\n    // Private helpers.\n    // ----------------\n\n    callback: function(callback, err, ret) {\n\n        if (callback) {\n\n            setTimeout(function() {\n                callback(err, ret)\n            }, 1)\n        }\n    },\n\n    setItem: function(key, item) {\n\n        localStorage.setItem(key, JSON.stringify(item))\n    },\n\n    getItem: function(key) {\n\n        const item = localStorage.getItem(key)\n        return item ? JSON.parse(item) : item\n    },\n\n    loadIndex: function(collection) {\n\n        const index = this.getItem(this.indexKey(collection)) || {}\n        index.keys = index.keys || []\n        return index\n    },\n\n    docKey: function(collection, id) {\n\n        return `${this.prefix  }.${  collection  }.docs.${  id}`\n    },\n\n    indexKey: function(collection) {\n\n        return `${this.prefix  }.${  collection  }.index`\n    }\n}\n\n\n\tjoint.g = g\n\tjoint.V = joint.Vectorizer = V\n\n\treturn joint\n\n}))\n"],"names":[],"sourceRoot":""}