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konva/src/Util.ts

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import { Konva } from './Global';
import { IRect, RGB, RGBA, Vector2d } from './types';
/*
* Last updated November 2011
* By Simon Sarris
* www.simonsarris.com
* sarris@acm.org
*
* 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.
* In most of the cases you don't need to use it in your app. Because it is for internal usage in Konva core.
* But there is a documentation for that class in case you still want
* to make some manual calculations.
* @constructor
* @param {Array} [m] Optional six-element matrix
* @memberof Konva
*/
export class Transform {
m: Array<number>;
dirty = false;
constructor(m = [1, 0, 0, 1, 0, 0]) {
this.m = (m && m.slice()) || [1, 0, 0, 1, 0, 0];
}
reset() {
this.m[0] = 1;
this.m[1] = 0;
this.m[2] = 0;
this.m[3] = 1;
this.m[4] = 0;
this.m[5] = 0;
}
/**
* Copy Konva.Transform object
* @method
* @name Konva.Transform#copy
* @returns {Konva.Transform}
* @example
* const tr = shape.getTransform().copy()
*/
copy() {
return new Transform(this.m);
}
copyInto(tr: Transform) {
tr.m[0] = this.m[0];
tr.m[1] = this.m[1];
tr.m[2] = this.m[2];
tr.m[3] = this.m[3];
tr.m[4] = this.m[4];
tr.m[5] = this.m[5];
}
/**
* Transform point
* @method
* @name Konva.Transform#point
* @param {Object} point 2D point(x, y)
* @returns {Object} 2D point(x, y)
*/
point(point: Vector2d) {
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
* @name Konva.Transform#translate
* @param {Number} x
* @param {Number} y
* @returns {Konva.Transform}
*/
translate(x: number, y: number) {
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
* @name Konva.Transform#scale
* @param {Number} sx
* @param {Number} sy
* @returns {Konva.Transform}
*/
scale(sx: number, sy: number) {
this.m[0] *= sx;
this.m[1] *= sx;
this.m[2] *= sy;
this.m[3] *= sy;
return this;
}
/**
* Apply rotation
* @method
* @name Konva.Transform#rotate
* @param {Number} rad Angle in radians
* @returns {Konva.Transform}
*/
rotate(rad: number) {
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
* @name Konva.Transform#getTranslation
* @returns {Object} 2D point(x, y)
*/
getTranslation() {
return {
x: this.m[4],
y: this.m[5],
};
}
/**
* Apply skew
* @method
* @name Konva.Transform#skew
* @param {Number} sx
* @param {Number} sy
* @returns {Konva.Transform}
*/
skew(sx: number, sy: number) {
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
* @name Konva.Transform#multiply
* @param {Konva.Transform} matrix
* @returns {Konva.Transform}
*/
multiply(matrix: Transform) {
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
* @name Konva.Transform#invert
* @returns {Konva.Transform}
*/
invert() {
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
* @name Konva.Transform#getMatrix
*/
getMatrix() {
return this.m;
}
/**
* convert transformation matrix back into node's attributes
* @method
* @name Konva.Transform#decompose
* @returns {Konva.Transform}
*/
decompose() {
var a = this.m[0];
var b = this.m[1];
var c = this.m[2];
var d = this.m[3];
var e = this.m[4];
var f = this.m[5];
var delta = a * d - b * c;
let result = {
x: e,
y: f,
rotation: 0,
scaleX: 0,
scaleY: 0,
skewX: 0,
skewY: 0,
};
// Apply the QR-like decomposition.
if (a != 0 || b != 0) {
var r = Math.sqrt(a * a + b * b);
result.rotation = b > 0 ? Math.acos(a / r) : -Math.acos(a / r);
result.scaleX = r;
result.scaleY = delta / r;
result.skewX = (a * c + b * d) / delta;
result.skewY = 0;
} else if (c != 0 || d != 0) {
var s = Math.sqrt(c * c + d * d);
result.rotation =
Math.PI / 2 - (d > 0 ? Math.acos(-c / s) : -Math.acos(c / s));
result.scaleX = delta / s;
result.scaleY = s;
result.skewX = 0;
result.skewY = (a * c + b * d) / delta;
} else {
// a = b = c = d = 0
}
result.rotation = Util._getRotation(result.rotation);
return result;
}
}
// CONSTANTS
var OBJECT_ARRAY = '[object Array]',
OBJECT_NUMBER = '[object Number]',
OBJECT_STRING = '[object String]',
OBJECT_BOOLEAN = '[object Boolean]',
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\((\d{1,3}),(\d{1,3}),(\d{1,3})\)/,
animQueue: Array<Function> = [];
const req =
(typeof requestAnimationFrame !== 'undefined' && requestAnimationFrame) ||
function (f) {
setTimeout(f, 60);
};
/**
* @namespace Util
* @memberof Konva
*/
export const Util = {
/*
* cherry-picked utilities from underscore.js
*/
_isElement(obj: any): obj is Element {
return !!(obj && obj.nodeType == 1);
},
_isFunction(obj: any) {
return !!(obj && obj.constructor && obj.call && obj.apply);
},
_isPlainObject(obj: any) {
return !!obj && obj.constructor === Object;
},
_isArray(obj: any): obj is Array<any> {
return Object.prototype.toString.call(obj) === OBJECT_ARRAY;
},
_isNumber(obj: any): obj is number {
return (
Object.prototype.toString.call(obj) === OBJECT_NUMBER &&
!isNaN(obj) &&
isFinite(obj)
);
},
_isString(obj: any): obj is string {
return Object.prototype.toString.call(obj) === OBJECT_STRING;
},
_isBoolean(obj: any): obj is boolean {
return Object.prototype.toString.call(obj) === OBJECT_BOOLEAN;
},
// arrays are objects too
isObject(val: any): val is Object {
return val instanceof Object;
},
isValidSelector(selector: any) {
if (typeof selector !== 'string') {
return false;
}
var firstChar = selector[0];
return (
firstChar === '#' ||
firstChar === '.' ||
firstChar === firstChar.toUpperCase()
);
},
_sign(number: number) {
if (number === 0) {
// that is not what sign usually returns
// but that is what we need
return 1;
}
if (number > 0) {
return 1;
} else {
return -1;
}
},
requestAnimFrame(callback: Function) {
animQueue.push(callback);
if (animQueue.length === 1) {
req(function () {
const queue = animQueue;
animQueue = [];
queue.forEach(function (cb) {
cb();
});
});
}
},
createCanvasElement() {
var canvas = document.createElement('canvas');
// on some environments canvas.style is readonly
try {
(<any>canvas).style = canvas.style || {};
} catch (e) {}
return canvas;
},
createImageElement() {
return document.createElement('img');
},
_isInDocument(el: any) {
while ((el = el.parentNode)) {
if (el == document) {
return true;
}
}
return false;
},
/*
* arg can be an image object or image data
*/
_urlToImage(url: string, callback: Function) {
// if arg is a string, then it's a data url
var imageObj = Util.createImageElement();
imageObj.onload = function () {
callback(imageObj);
};
imageObj.src = url;
},
_rgbToHex(r: number, g: number, b: number) {
return ((1 << 24) + (r << 16) + (g << 8) + b).toString(16).slice(1);
},
_hexToRgb(hex: string): RGB {
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
* @example
* shape.fill(Konva.Util.getRandomColor());
*/
getRandomColor() {
var randColor = ((Math.random() * 0xffffff) << 0).toString(16);
while (randColor.length < 6) {
randColor = ZERO + randColor;
}
return HASH + randColor;
},
/**
* get RGB components of a color
* @method
* @memberof Konva.Util
* @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(color: string): RGB {
var rgb;
// color string
if (color in COLORS) {
rgb = COLORS[color];
return {
r: rgb[0],
g: rgb[1],
b: rgb[2],
};
} else if (color[0] === HASH) {
// hex
return this._hexToRgb(color.substring(1));
} else if (color.substr(0, 4) === RGB_PAREN) {
// rgb string
rgb = RGB_REGEX.exec(color.replace(/ /g, ''));
return {
r: parseInt(rgb[1], 10),
g: parseInt(rgb[2], 10),
b: parseInt(rgb[3], 10),
};
} else {
// default
return {
r: 0,
g: 0,
b: 0,
};
}
},
// convert any color string to RGBA object
// from https://github.com/component/color-parser
colorToRGBA(str: string): RGBA {
str = str || 'black';
return (
Util._namedColorToRBA(str) ||
Util._hex3ColorToRGBA(str) ||
Util._hex6ColorToRGBA(str) ||
Util._rgbColorToRGBA(str) ||
Util._rgbaColorToRGBA(str) ||
Util._hslColorToRGBA(str)
);
},
// Parse named css color. Like "green"
_namedColorToRBA(str: string) {
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(str: string): RGBA {
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(str: string): RGBA {
if (str.indexOf('rgba(') === 0) {
str = str.match(/rgba\(([^)]+)\)/)[1];
var parts = str.split(/ *, */).map((n, index) => {
if (n.slice(-1) === '%') {
return index === 3 ? parseInt(n) / 100 : (parseInt(n) / 100) * 255;
}
return Number(n);
});
return {
r: parts[0],
g: parts[1],
b: parts[2],
a: parts[3],
};
}
},
// Parse #nnnnnn
_hex6ColorToRGBA(str: string): RGBA {
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(str: string): RGBA {
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,
};
}
},
// Code adapted from https://github.com/Qix-/color-convert/blob/master/conversions.js#L244
_hslColorToRGBA(str: string): RGBA {
// Check hsl() format
if (/hsl\((\d+),\s*([\d.]+)%,\s*([\d.]+)%\)/g.test(str)) {
// Extract h, s, l
const [_, ...hsl] = /hsl\((\d+),\s*([\d.]+)%,\s*([\d.]+)%\)/g.exec(str);
const h = Number(hsl[0]) / 360;
const s = Number(hsl[1]) / 100;
const l = Number(hsl[2]) / 100;
let t2;
let t3;
let val;
if (s === 0) {
val = l * 255;
return {
r: Math.round(val),
g: Math.round(val),
b: Math.round(val),
a: 1,
};
}
if (l < 0.5) {
t2 = l * (1 + s);
} else {
t2 = l + s - l * s;
}
const t1 = 2 * l - t2;
const rgb = [0, 0, 0];
for (let i = 0; i < 3; i++) {
t3 = h + (1 / 3) * -(i - 1);
if (t3 < 0) {
t3++;
}
if (t3 > 1) {
t3--;
}
if (6 * t3 < 1) {
val = t1 + (t2 - t1) * 6 * t3;
} else if (2 * t3 < 1) {
val = t2;
} else if (3 * t3 < 2) {
val = t1 + (t2 - t1) * (2 / 3 - t3) * 6;
} else {
val = t1;
}
rgb[i] = val * 255;
}
return {
r: Math.round(rgb[0]),
g: Math.round(rgb[1]),
b: Math.round(rgb[2]),
a: 1,
};
}
},
/**
* check intersection of two client rectangles
* @method
* @memberof Konva.Util
* @param {Object} r1 - { x, y, width, height } client rectangle
* @param {Object} r2 - { x, y, width, height } client rectangle
* @example
* const overlapping = Konva.Util.haveIntersection(shape1.getClientRect(), shape2.getClientRect());
*/
haveIntersection(r1: IRect, r2: IRect) {
return !(
r2.x > r1.x + r1.width ||
r2.x + r2.width < r1.x ||
r2.y > r1.y + r1.height ||
r2.y + r2.height < r1.y
);
},
cloneObject<Any>(obj: Any): Any {
var retObj: any = {};
for (var key in obj) {
if (this._isPlainObject(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(arr: Array<any>) {
return arr.slice(0);
},
degToRad(deg: number) {
return deg * PI_OVER_DEG180;
},
radToDeg(rad: number) {
return rad * DEG180_OVER_PI;
},
_degToRad(deg: number) {
Util.warn(
'Util._degToRad is removed. Please use public Util.degToRad instead.'
);
return Util.degToRad(deg);
},
_radToDeg(rad: number) {
Util.warn(
'Util._radToDeg is removed. Please use public Util.radToDeg instead.'
);
return Util.radToDeg(rad);
},
_getRotation(radians) {
return Konva.angleDeg ? Util.radToDeg(radians) : radians;
},
_capitalize(str: string) {
return str.charAt(0).toUpperCase() + str.slice(1);
},
throw(str: string) {
throw new Error(KONVA_ERROR + str);
},
error(str: string) {
console.error(KONVA_ERROR + str);
},
warn(str: string) {
if (!Konva.showWarnings) {
return;
}
console.warn(KONVA_WARNING + str);
},
each(obj, func) {
for (var key in obj) {
func(key, obj[key]);
}
},
_inRange(val, left, right) {
return left <= val && val < right;
},
_getProjectionToSegment(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(pt: Vector2d, line, isClosed) {
var pc = 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 = 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(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 = Util._getProjectionToLine(point, start, isClosed);
newStart.push(pr.x);
newStart.push(pr.y);
});
return newStart;
},
_prepareToStringify(obj) {
var desc;
obj.visitedByCircularReferenceRemoval = true;
for (var key in obj) {
if (
!(obj.hasOwnProperty(key) && obj[key] && typeof obj[key] == 'object')
) {
continue;
}
desc = Object.getOwnPropertyDescriptor(obj, key);
if (
obj[key].visitedByCircularReferenceRemoval ||
Util._isElement(obj[key])
) {
if (desc.configurable) {
delete obj[key];
} else {
return null;
}
} else if (Util._prepareToStringify(obj[key]) === null) {
if (desc.configurable) {
delete obj[key];
} else {
return null;
}
}
}
delete obj.visitedByCircularReferenceRemoval;
return obj;
},
// very simplified version of Object.assign
_assign<T, U>(target: T, source: U) {
for (var key in source) {
(<any>target)[key] = source[key];
}
return target as T & U;
},
_getFirstPointerId(evt) {
if (!evt.touches) {
// try to use pointer id or fake id
return evt.pointerId || 999;
} else {
return evt.changedTouches[0].identifier;
}
},
releaseCanvas(...canvases: HTMLCanvasElement[]) {
canvases.forEach(c => {
c.width = 0;
c.height = 0;
})
}
};
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