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Util.js
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/*eslint-disable eqeqeq, no-cond-assign, no-empty*/
(function() {
'use strict';
/**
* Collection constructor. Collection extends
* Array. This class is used in conjunction with {@link Konva.Container#get}
* @constructor
* @memberof Konva
*/
Konva.Collection = function() {
var args = [].slice.call(arguments), length = args.length, i = 0;
this.length = length;
for(; i < length; i++) {
this[i] = args[i];
}
return this;
};
Konva.Collection.prototype = [];
/**
* iterate through node array and run a function for each node.
* The node and index is passed into the function
* @method
* @memberof Konva.Collection.prototype
* @param {Function} func
* @example
* // get all nodes with name foo inside layer, and set x to 10 for each
* layer.get('.foo').each(function(shape, n) {
* shape.setX(10);
* });
*/
Konva.Collection.prototype.each = function(func) {
for(var n = 0; n < this.length; n++) {
func(this[n], n);
}
};
/**
* convert collection into an array
* @method
* @memberof Konva.Collection.prototype
*/
Konva.Collection.prototype.toArray = function() {
var arr = [],
len = this.length,
n;
for(n = 0; n < len; n++) {
arr.push(this[n]);
}
return arr;
};
/**
* convert array into a collection
* @method
* @memberof Konva.Collection
* @param {Array} arr
*/
Konva.Collection.toCollection = function(arr) {
var collection = new Konva.Collection(),
len = arr.length,
n;
for(n = 0; n < len; n++) {
collection.push(arr[n]);
}
return collection;
};
// map one method by it's name
Konva.Collection._mapMethod = function(methodName) {
Konva.Collection.prototype[methodName] = function() {
var len = this.length,
i;
var args = [].slice.call(arguments);
for(i = 0; i < len; i++) {
this[i][methodName].apply(this[i], args);
}
return this;
};
};
Konva.Collection.mapMethods = function(constructor) {
var prot = constructor.prototype;
for(var methodName in prot) {
Konva.Collection._mapMethod(methodName);
}
};
/*
* Last updated November 2011
* By Simon Sarris
* www.simonsarris.com
*
* Free to use and distribute at will
* So long as you are nice to people, etc
*/
/*
* The usage of this class was inspired by some of the work done by a forked
* project, KineticJS-Ext by Wappworks, which is based on Simon's Transform
* class. Modified by Eric Rowell
*/
/**
* Transform constructor
* @constructor
* @param {Array} [m] Optional six-element matrix
* @memberof Konva
*/
Konva.Transform = function(m) {
this.m = (m && m.slice()) || [1, 0, 0, 1, 0, 0];
};
Konva.Transform.prototype = {
/**
* Copy Konva.Transform object
* @method
* @memberof Konva.Transform.prototype
* @returns {Konva.Transform}
*/
copy: function() {
return new Konva.Transform(this.m);
},
/**
* Transform point
* @method
* @memberof Konva.Transform.prototype
* @param {Object} point 2D point(x, y)
* @returns {Object} 2D point(x, y)
*/
point: function(point) {
var m = this.m;
return {
x: m[0] * point.x + m[2] * point.y + m[4],
y: m[1] * point.x + m[3] * point.y + m[5]
};
},
/**
* Apply translation
* @method
* @memberof Konva.Transform.prototype
* @param {Number} x
* @param {Number} y
* @returns {Konva.Transform}
*/
translate: function(x, y) {
this.m[4] += this.m[0] * x + this.m[2] * y;
this.m[5] += this.m[1] * x + this.m[3] * y;
return this;
},
/**
* Apply scale
* @method
* @memberof Konva.Transform.prototype
* @param {Number} sx
* @param {Number} sy
* @returns {Konva.Transform}
*/
scale: function(sx, sy) {
this.m[0] *= sx;
this.m[1] *= sx;
this.m[2] *= sy;
this.m[3] *= sy;
return this;
},
/**
* Apply rotation
* @method
* @memberof Konva.Transform.prototype
* @param {Number} rad Angle in radians
* @returns {Konva.Transform}
*/
rotate: function(rad) {
var c = Math.cos(rad);
var s = Math.sin(rad);
var m11 = this.m[0] * c + this.m[2] * s;
var m12 = this.m[1] * c + this.m[3] * s;
var m21 = this.m[0] * -s + this.m[2] * c;
var m22 = this.m[1] * -s + this.m[3] * c;
this.m[0] = m11;
this.m[1] = m12;
this.m[2] = m21;
this.m[3] = m22;
return this;
},
/**
* Returns the translation
* @method
* @memberof Konva.Transform.prototype
* @returns {Object} 2D point(x, y)
*/
getTranslation: function() {
return {
x: this.m[4],
y: this.m[5]
};
},
/**
* Apply skew
* @method
* @memberof Konva.Transform.prototype
* @param {Number} sx
* @param {Number} sy
* @returns {Konva.Transform}
*/
skew: function(sx, sy) {
var m11 = this.m[0] + this.m[2] * sy;
var m12 = this.m[1] + this.m[3] * sy;
var m21 = this.m[2] + this.m[0] * sx;
var m22 = this.m[3] + this.m[1] * sx;
this.m[0] = m11;
this.m[1] = m12;
this.m[2] = m21;
this.m[3] = m22;
return this;
},
/**
* Transform multiplication
* @method
* @memberof Konva.Transform.prototype
* @param {Konva.Transform} matrix
* @returns {Konva.Transform}
*/
multiply: function(matrix) {
var m11 = this.m[0] * matrix.m[0] + this.m[2] * matrix.m[1];
var m12 = this.m[1] * matrix.m[0] + this.m[3] * matrix.m[1];
var m21 = this.m[0] * matrix.m[2] + this.m[2] * matrix.m[3];
var m22 = this.m[1] * matrix.m[2] + this.m[3] * matrix.m[3];
var dx = this.m[0] * matrix.m[4] + this.m[2] * matrix.m[5] + this.m[4];
var dy = this.m[1] * matrix.m[4] + this.m[3] * matrix.m[5] + this.m[5];
this.m[0] = m11;
this.m[1] = m12;
this.m[2] = m21;
this.m[3] = m22;
this.m[4] = dx;
this.m[5] = dy;
return this;
},
/**
* Invert the matrix
* @method
* @memberof Konva.Transform.prototype
* @returns {Konva.Transform}
*/
invert: function() {
var d = 1 / (this.m[0] * this.m[3] - this.m[1] * this.m[2]);
var m0 = this.m[3] * d;
var m1 = -this.m[1] * d;
var m2 = -this.m[2] * d;
var m3 = this.m[0] * d;
var m4 = d * (this.m[2] * this.m[5] - this.m[3] * this.m[4]);
var m5 = d * (this.m[1] * this.m[4] - this.m[0] * this.m[5]);
this.m[0] = m0;
this.m[1] = m1;
this.m[2] = m2;
this.m[3] = m3;
this.m[4] = m4;
this.m[5] = m5;
return this;
},
/**
* return matrix
* @method
* @memberof Konva.Transform.prototype
*/
getMatrix: function() {
return this.m;
},
/**
* set to absolute position via translation
* @method
* @memberof Konva.Transform.prototype
* @returns {Konva.Transform}
* @author ericdrowell
*/
setAbsolutePosition: function(x, y) {
var m0 = this.m[0],
m1 = this.m[1],
m2 = this.m[2],
m3 = this.m[3],
m4 = this.m[4],
m5 = this.m[5],
yt = ((m0 * (y - m5)) - (m1 * (x - m4))) / ((m0 * m3) - (m1 * m2)),
xt = (x - m4 - (m2 * yt)) / m0;
return this.translate(xt, yt);
}
};
// CONSTANTS
var CONTEXT_2D = '2d',
OBJECT_ARRAY = '[object Array]',
OBJECT_NUMBER = '[object Number]',
OBJECT_STRING = '[object String]',
PI_OVER_DEG180 = Math.PI / 180,
DEG180_OVER_PI = 180 / Math.PI,
HASH = '#',
EMPTY_STRING = '',
ZERO = '0',
KONVA_WARNING = 'Konva warning: ',
KONVA_ERROR = 'Konva error: ',
RGB_PAREN = 'rgb(',
COLORS = {
aliceblue: [240, 248, 255],
antiquewhite: [250, 235, 215],
aqua: [0, 255, 255],
aquamarine: [127, 255, 212],
azure: [240, 255, 255],
beige: [245, 245, 220],
bisque: [255, 228, 196],
black: [0, 0, 0],
blanchedalmond: [255, 235, 205],
blue: [0, 0, 255],
blueviolet: [138, 43, 226],
brown: [165, 42, 42],
burlywood: [222, 184, 135],
cadetblue: [95, 158, 160],
chartreuse: [127, 255, 0],
chocolate: [210, 105, 30],
coral: [255, 127, 80],
cornflowerblue: [100, 149, 237],
cornsilk: [255, 248, 220],
crimson: [220, 20, 60],
cyan: [0, 255, 255],
darkblue: [0, 0, 139],
darkcyan: [0, 139, 139],
darkgoldenrod: [184, 132, 11],
darkgray: [169, 169, 169],
darkgreen: [0, 100, 0],
darkgrey: [169, 169, 169],
darkkhaki: [189, 183, 107],
darkmagenta: [139, 0, 139],
darkolivegreen: [85, 107, 47],
darkorange: [255, 140, 0],
darkorchid: [153, 50, 204],
darkred: [139, 0, 0],
darksalmon: [233, 150, 122],
darkseagreen: [143, 188, 143],
darkslateblue: [72, 61, 139],
darkslategray: [47, 79, 79],
darkslategrey: [47, 79, 79],
darkturquoise: [0, 206, 209],
darkviolet: [148, 0, 211],
deeppink: [255, 20, 147],
deepskyblue: [0, 191, 255],
dimgray: [105, 105, 105],
dimgrey: [105, 105, 105],
dodgerblue: [30, 144, 255],
firebrick: [178, 34, 34],
floralwhite: [255, 255, 240],
forestgreen: [34, 139, 34],
fuchsia: [255, 0, 255],
gainsboro: [220, 220, 220],
ghostwhite: [248, 248, 255],
gold: [255, 215, 0],
goldenrod: [218, 165, 32],
gray: [128, 128, 128],
green: [0, 128, 0],
greenyellow: [173, 255, 47],
grey: [128, 128, 128],
honeydew: [240, 255, 240],
hotpink: [255, 105, 180],
indianred: [205, 92, 92],
indigo: [75, 0, 130],
ivory: [255, 255, 240],
khaki: [240, 230, 140],
lavender: [230, 230, 250],
lavenderblush: [255, 240, 245],
lawngreen: [124, 252, 0],
lemonchiffon: [255, 250, 205],
lightblue: [173, 216, 230],
lightcoral: [240, 128, 128],
lightcyan: [224, 255, 255],
lightgoldenrodyellow: [250, 250, 210],
lightgray: [211, 211, 211],
lightgreen: [144, 238, 144],
lightgrey: [211, 211, 211],
lightpink: [255, 182, 193],
lightsalmon: [255, 160, 122],
lightseagreen: [32, 178, 170],
lightskyblue: [135, 206, 250],
lightslategray: [119, 136, 153],
lightslategrey: [119, 136, 153],
lightsteelblue: [176, 196, 222],
lightyellow: [255, 255, 224],
lime: [0, 255, 0],
limegreen: [50, 205, 50],
linen: [250, 240, 230],
magenta: [255, 0, 255],
maroon: [128, 0, 0],
mediumaquamarine: [102, 205, 170],
mediumblue: [0, 0, 205],
mediumorchid: [186, 85, 211],
mediumpurple: [147, 112, 219],
mediumseagreen: [60, 179, 113],
mediumslateblue: [123, 104, 238],
mediumspringgreen: [0, 250, 154],
mediumturquoise: [72, 209, 204],
mediumvioletred: [199, 21, 133],
midnightblue: [25, 25, 112],
mintcream: [245, 255, 250],
mistyrose: [255, 228, 225],
moccasin: [255, 228, 181],
navajowhite: [255, 222, 173],
navy: [0, 0, 128],
oldlace: [253, 245, 230],
olive: [128, 128, 0],
olivedrab: [107, 142, 35],
orange: [255, 165, 0],
orangered: [255, 69, 0],
orchid: [218, 112, 214],
palegoldenrod: [238, 232, 170],
palegreen: [152, 251, 152],
paleturquoise: [175, 238, 238],
palevioletred: [219, 112, 147],
papayawhip: [255, 239, 213],
peachpuff: [255, 218, 185],
peru: [205, 133, 63],
pink: [255, 192, 203],
plum: [221, 160, 203],
powderblue: [176, 224, 230],
purple: [128, 0, 128],
rebeccapurple: [102, 51, 153],
red: [255, 0, 0],
rosybrown: [188, 143, 143],
royalblue: [65, 105, 225],
saddlebrown: [139, 69, 19],
salmon: [250, 128, 114],
sandybrown: [244, 164, 96],
seagreen: [46, 139, 87],
seashell: [255, 245, 238],
sienna: [160, 82, 45],
silver: [192, 192, 192],
skyblue: [135, 206, 235],
slateblue: [106, 90, 205],
slategray: [119, 128, 144],
slategrey: [119, 128, 144],
snow: [255, 255, 250],
springgreen: [0, 255, 127],
steelblue: [70, 130, 180],
tan: [210, 180, 140],
teal: [0, 128, 128],
thistle: [216, 191, 216],
transparent: [255, 255, 255, 0],
tomato: [255, 99, 71],
turquoise: [64, 224, 208],
violet: [238, 130, 238],
wheat: [245, 222, 179],
white: [255, 255, 255],
whitesmoke: [245, 245, 245],
yellow: [255, 255, 0],
yellowgreen: [154, 205, 5]
},
RGB_REGEX = /rgb\((\d{1,3}),(\d{1,3}),(\d{1,3})\)/;
/**
* @namespace Util
* @memberof Konva
*/
Konva.Util = {
/*
* cherry-picked utilities from underscore.js
*/
_isElement: function(obj) {
return !!(obj && obj.nodeType == 1);
},
_isFunction: function(obj) {
return !!(obj && obj.constructor && obj.call && obj.apply);
},
_isObject: function(obj) {
return (!!obj && obj.constructor === Object);
},
_isArray: function(obj) {
return Object.prototype.toString.call(obj) === OBJECT_ARRAY;
},
_isNumber: function(obj) {
return Object.prototype.toString.call(obj) === OBJECT_NUMBER;
},
_isString: function(obj) {
return Object.prototype.toString.call(obj) === OBJECT_STRING;
},
// Returns a function, that, when invoked, will only be triggered at most once
// during a given window of time. Normally, the throttled function will run
// as much as it can, without ever going more than once per `wait` duration;
// but if you'd like to disable the execution on the leading edge, pass
// `{leading: false}`. To disable execution on the trailing edge, ditto.
_throttle: function(func, wait, opts) {
var context, args, result;
var timeout = null;
var previous = 0;
var options = opts || {};
var later = function() {
previous = options.leading === false ? 0 : new Date().getTime();
timeout = null;
result = func.apply(context, args);
context = args = null;
};
return function() {
var now = new Date().getTime();
if (!previous && options.leading === false) {
previous = now;
}
var remaining = wait - (now - previous);
context = this;
args = arguments;
if (remaining <= 0) {
clearTimeout(timeout);
timeout = null;
previous = now;
result = func.apply(context, args);
context = args = null;
} else if (!timeout && options.trailing !== false) {
timeout = setTimeout(later, remaining);
}
return result;
};
},
/*
* other utils
*/
_hasMethods: function(obj) {
var names = [],
key;
for(key in obj) {
if (!obj.hasOwnProperty(key)) {
continue;
}
if(this._isFunction(obj[key])) {
names.push(key);
}
}
return names.length > 0;
},
isValidSelector: function(selector) {
if (typeof selector !== 'string') {
return false;
}
var firstChar = selector[0];
return firstChar === '#' || firstChar === '.' || firstChar === firstChar.toUpperCase();
},
createCanvasElement: function() {
var canvas = Konva.document.createElement('canvas');
// on some environments canvas.style is readonly
try {
canvas.style = canvas.style || {};
} catch (e) {
}
return canvas;
},
isBrowser: function() {
return (typeof exports !== 'object');
},
_isInDocument: function(el) {
while(el = el.parentNode) {
if(el == Konva.document) {
return true;
}
}
return false;
},
_simplifyArray: function(arr) {
var retArr = [],
len = arr.length,
util = Konva.Util,
n, val;
for (n = 0; n < len; n++) {
val = arr[n];
if (util._isNumber(val)) {
val = Math.round(val * 1000) / 1000;
}
else if (!util._isString(val)) {
val = val.toString();
}
retArr.push(val);
}
return retArr;
},
/*
* arg can be an image object or image data
*/
_getImage: function(arg, callback) {
var imageObj, canvas;
// if arg is null or undefined
if(!arg) {
callback(null);
}
// if arg is already an image object
else if(this._isElement(arg)) {
callback(arg);
}
// if arg is a string, then it's a data url
else if(this._isString(arg)) {
imageObj = new Konva.window.Image();
imageObj.onload = function() {
callback(imageObj);
};
imageObj.src = arg;
}
//if arg is an object that contains the data property, it's an image object
else if(arg.data) {
canvas = Konva.Util.createCanvasElement();
canvas.width = arg.width;
canvas.height = arg.height;
var _context = canvas.getContext(CONTEXT_2D);
_context.putImageData(arg, 0, 0);
this._getImage(canvas.toDataURL(), callback);
}
else {
callback(null);
}
},
_getRGBAString: function(obj) {
var red = obj.red || 0,
green = obj.green || 0,
blue = obj.blue || 0,
alpha = obj.alpha || 1;
return [
'rgba(',
red,
',',
green,
',',
blue,
',',
alpha,
')'
].join(EMPTY_STRING);
},
_rgbToHex: function(r, g, b) {
return ((1 << 24) + (r << 16) + (g << 8) + b).toString(16).slice(1);
},
_hexToRgb: function(hex) {
hex = hex.replace(HASH, EMPTY_STRING);
var bigint = parseInt(hex, 16);
return {
r: (bigint >> 16) & 255,
g: (bigint >> 8) & 255,
b: bigint & 255
};
},
/**
* return random hex color
* @method
* @memberof Konva.Util.prototype
*/
getRandomColor: function() {
var randColor = (Math.random() * 0xFFFFFF << 0).toString(16);
while (randColor.length < 6) {
randColor = ZERO + randColor;
}
return HASH + randColor;
},
/**
* return value with default fallback
* @method
* @memberof Konva.Util.prototype
*/
get: function(val, def) {
if (val === undefined) {
return def;
}
else {
return val;
}
},
/**
* get RGB components of a color
* @method
* @memberof Konva.Util.prototype
* @param {String} color
* @example
* // each of the following examples return {r:0, g:0, b:255}
* var rgb = Konva.Util.getRGB('blue');
* var rgb = Konva.Util.getRGB('#0000ff');
* var rgb = Konva.Util.getRGB('rgb(0,0,255)');
*/
getRGB: function(color) {
var rgb;
// color string
if (color in COLORS) {
rgb = COLORS[color];
return {
r: rgb[0],
g: rgb[1],
b: rgb[2]
};
}
// hex
else if (color[0] === HASH) {
return this._hexToRgb(color.substring(1));
}
// rgb string
else if (color.substr(0, 4) === RGB_PAREN) {
rgb = RGB_REGEX.exec(color.replace(/ /g, ''));
return {
r: parseInt(rgb[1], 10),
g: parseInt(rgb[2], 10),
b: parseInt(rgb[3], 10)
};
}
// default
else {
return {
r: 0,
g: 0,
b: 0
};
}
},
// convert any color string to RGBA object
// from https://github.com/component/color-parser
colorToRGBA: function(str) {
str = str || 'black';
return Konva.Util._namedColorToRBA(str)
|| Konva.Util._hex3ColorToRGBA(str)
|| Konva.Util._hex6ColorToRGBA(str)
|| Konva.Util._rgbColorToRGBA(str)
|| Konva.Util._rgbaColorToRGBA(str);
},
// Parse named css color. Like "green"
_namedColorToRBA: function(str) {
var c = COLORS[str.toLowerCase()];
if (!c) {
return null;
}
return {
r: c[0],
g: c[1],
b: c[2],
a: 1
};
},
// Parse rgb(n, n, n)
_rgbColorToRGBA: function(str) {
if (str.indexOf('rgb(') === 0) {
str = str.match(/rgb\(([^)]+)\)/)[1];
var parts = str.split(/ *, */).map(Number);
return {
r: parts[0],
g: parts[1],
b: parts[2],
a: 1
};
}
},
// Parse rgba(n, n, n, n)
_rgbaColorToRGBA: function(str) {
if (str.indexOf('rgba(') === 0) {
str = str.match(/rgba\(([^)]+)\)/)[1];
var parts = str.split(/ *, */).map(Number);
return {
r: parts[0],
g: parts[1],
b: parts[2],
a: parts[3]
};
}
},
// Parse #nnnnnn
_hex6ColorToRGBA: function(str) {
if ((str[0] === '#') && (str.length === 7)) {
return {
r: parseInt(str.slice(1, 3), 16),
g: parseInt(str.slice(3, 5), 16),
b: parseInt(str.slice(5, 7), 16),
a: 1
};
}
},
// Parse #nnn
_hex3ColorToRGBA: function(str) {
if ((str[0] === '#') && (str.length === 4)) {
return {
r: parseInt(str[1] + str[1], 16),
g: parseInt(str[2] + str[2], 16),
b: parseInt(str[3] + str[3], 16),
a: 1
};
}
},
// o1 takes precedence over o2
_merge: function(o1, o2) {
var retObj = this._clone(o2);
for(var key in o1) {
if(this._isObject(o1[key])) {
retObj[key] = this._merge(o1[key], retObj[key]);
}
else {
retObj[key] = o1[key];
}
}
return retObj;
},
cloneObject: function(obj) {
var retObj = {};
for(var key in obj) {
if(this._isObject(obj[key])) {
retObj[key] = this.cloneObject(obj[key]);
}
else if (this._isArray(obj[key])) {
retObj[key] = this.cloneArray(obj[key]);
} else {
retObj[key] = obj[key];
}
}
return retObj;
},
cloneArray: function(arr) {
return arr.slice(0);
},
_degToRad: function(deg) {
return deg * PI_OVER_DEG180;
},
_radToDeg: function(rad) {
return rad * DEG180_OVER_PI;
},
_capitalize: function(str) {
return str.charAt(0).toUpperCase() + str.slice(1);
},
throw: function(str) {
throw new Error(KONVA_ERROR + str);
},
error: function(str) {
console.error(KONVA_ERROR + str);
},
warn: function(str) {
/*
* IE9 on Windows7 64bit will throw a JS error
* if we don't use window.console in the conditional
*/
if(Konva.global.console && console.warn && Konva.showWarnings) {
console.warn(KONVA_WARNING + str);
}
},
extend: function(child, parent) {
function Ctor() {
this.constructor = child;
}
Ctor.prototype = parent.prototype;
var oldProto = child.prototype;
child.prototype = new Ctor();
for (var key in oldProto) {
if (oldProto.hasOwnProperty(key)) {
child.prototype[key] = oldProto[key];
}
}
child.__super__ = parent.prototype;
// create reference to parent
child.super = parent;
},
/**
* adds methods to a constructor prototype
* @method
* @memberof Konva.Util.prototype
* @param {Function} constructor
* @param {Object} methods
*/
addMethods: function(constructor, methods) {
var key;
for (key in methods) {
constructor.prototype[key] = methods[key];
}
},
_getControlPoints: function(x0, y0, x1, y1, x2, y2, t) {
var d01 = Math.sqrt(Math.pow(x1 - x0, 2) + Math.pow(y1 - y0, 2)),
d12 = Math.sqrt(Math.pow(x2 - x1, 2) + Math.pow(y2 - y1, 2)),
fa = t * d01 / (d01 + d12),
fb = t * d12 / (d01 + d12),
p1x = x1 - fa * (x2 - x0),
p1y = y1 - fa * (y2 - y0),
p2x = x1 + fb * (x2 - x0),
p2y = y1 + fb * (y2 - y0);
return [p1x, p1y, p2x, p2y];
},
_expandPoints: function(p, tension) {
var len = p.length,
allPoints = [],
n, cp;
for (n = 2; n < len - 2; n += 2) {
cp = Konva.Util._getControlPoints(p[n - 2], p[n - 1], p[n], p[n + 1], p[n + 2], p[n + 3], tension);
allPoints.push(cp[0]);
allPoints.push(cp[1]);
allPoints.push(p[n]);
allPoints.push(p[n + 1]);
allPoints.push(cp[2]);
allPoints.push(cp[3]);
}
return allPoints;
},
_removeLastLetter: function(str) {
return str.substring(0, str.length - 1);
},
each: function(obj, func) {
for (var key in obj) {
func(key, obj[key]);
}
},
_getProjectionToSegment: function(x1, y1, x2, y2, x3, y3) {
var x, y, dist;
var pd2 = (x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2);
if(pd2 == 0) {
x = x1;
y = y1;
dist = (x3 - x2) * (x3 - x2) + (y3 - y2) * (y3 - y2);
} else {
var u = ((x3 - x1) * (x2 - x1) + (y3 - y1) * (y2 - y1)) / pd2;
if(u < 0) {
x = x1;
y = y1;
dist = (x1 - x3) * (x1 - x3) + (y1 - y3) * (y1 - y3);
} else if (u > 1.0) {
x = x2;
y = y2;
dist = (x2 - x3) * (x2 - x3) + (y2 - y3) * (y2 - y3);
} else {
x = x1 + u * (x2 - x1);
y = y1 + u * (y2 - y1);
dist = (x - x3) * (x - x3) + (y - y3) * (y - y3);
}
}
return [x, y, dist];
},
// line as array of points.
// line might be closed
_getProjectionToLine: function(pt, line, isClosed) {
var pc = Konva.Util.cloneObject(pt);
var dist = Number.MAX_VALUE;
line.forEach(function(p1, i) {
if (!isClosed && i === line.length - 1) {
return;
}
var p2 = line[(i + 1) % line.length];
var proj = Konva.Util._getProjectionToSegment(p1.x, p1.y, p2.x, p2.y, pt.x, pt.y);
var px = proj[0], py = proj[1], pdist = proj[2];
if (pdist < dist) {
pc.x = px;
pc.y = py;
dist = pdist;
}
});
return pc;
},
_prepareArrayForTween: function(startArray, endArray, isClosed) {
var n, start = [], end = [];
if (startArray.length > endArray.length) {
var temp = endArray;
endArray = startArray;
startArray = temp;
}
for (n = 0; n < startArray.length; n += 2) {
start.push({
x: startArray[n],
y: startArray[n + 1]
});
}
for (n = 0; n < endArray.length; n += 2) {
end.push({
x: endArray[n],
y: endArray[n + 1]
});
}
var newStart = [];
end.forEach(function(point) {
var pr = Konva.Util._getProjectionToLine(point, start, isClosed);
newStart.push(pr.x);
newStart.push(pr.y);
});
return newStart;
},
_prepareToStringify: function(obj) {
var desc;
obj.visitedByCircularReferenceRemoval = true;
for(var key in obj) {
if (!(obj.hasOwnProperty(key) && obj[key] && typeof obj[key] == 'object')) {