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color.class.js
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(function(global) {
'use strict';
var fabric = global.fabric || (global.fabric = { });
if (fabric.Color) {
fabric.warn('fabric.Color is already defined.');
return;
}
/**
* Color class
* The purpose of {@link fabric.Color} is to abstract and encapsulate common color operations;
* {@link fabric.Color} is a constructor and creates instances of {@link fabric.Color} objects.
*
* @class fabric.Color
* @param {String} color optional in hex or rgb(a) or hsl format or from known color list
* @return {fabric.Color} thisArg
* @tutorial {@link http://fabricjs.com/fabric-intro-part-2/#colors}
*/
function Color(color) {
if (!color) {
this.setSource([0, 0, 0, 1]);
}
else {
this._tryParsingColor(color);
}
}
fabric.Color = Color;
fabric.Color.prototype = /** @lends fabric.Color.prototype */ {
/**
* @private
* @param {String|Array} color Color value to parse
*/
_tryParsingColor: function(color) {
var source;
if (color in Color.colorNameMap) {
color = Color.colorNameMap[color];
}
if (color === 'transparent') {
source = [255, 255, 255, 0];
}
if (!source) {
source = Color.sourceFromHex(color);
}
if (!source) {
source = Color.sourceFromRgb(color);
}
if (!source) {
source = Color.sourceFromHsl(color);
}
if (!source) {
//if color is not recognize let's make black as canvas does
source = [0, 0, 0, 1];
}
if (source) {
this.setSource(source);
}
},
/**
* Adapted from <a href="https://rawgithub.com/mjijackson/mjijackson.github.com/master/2008/02/rgb-to-hsl-and-rgb-to-hsv-color-model-conversion-algorithms-in-javascript.html">https://github.com/mjijackson</a>
* @private
* @param {Number} r Red color value
* @param {Number} g Green color value
* @param {Number} b Blue color value
* @return {Array} Hsl color
*/
_rgbToHsl: function(r, g, b) {
r /= 255; g /= 255; b /= 255;
var h, s, l,
max = fabric.util.array.max([r, g, b]),
min = fabric.util.array.min([r, g, b]);
l = (max + min) / 2;
if (max === min) {
h = s = 0; // achromatic
}
else {
var d = max - min;
s = l > 0.5 ? d / (2 - max - min) : d / (max + min);
switch (max) {
case r:
h = (g - b) / d + (g < b ? 6 : 0);
break;
case g:
h = (b - r) / d + 2;
break;
case b:
h = (r - g) / d + 4;
break;
}
h /= 6;
}
return [
Math.round(h * 360),
Math.round(s * 100),
Math.round(l * 100)
];
},
/**
* Returns source of this color (where source is an array representation; ex: [200, 200, 100, 1])
* @return {Array}
*/
getSource: function() {
return this._source;
},
/**
* Sets source of this color (where source is an array representation; ex: [200, 200, 100, 1])
* @param {Array} source
*/
setSource: function(source) {
this._source = source;
},
/**
* Returns color representation in RGB format
* @return {String} ex: rgb(0-255,0-255,0-255)
*/
toRgb: function() {
var source = this.getSource();
return 'rgb(' + source[0] + ',' + source[1] + ',' + source[2] + ')';
},
/**
* Returns color representation in RGBA format
* @return {String} ex: rgba(0-255,0-255,0-255,0-1)
*/
toRgba: function() {
var source = this.getSource();
return 'rgba(' + source[0] + ',' + source[1] + ',' + source[2] + ',' + source[3] + ')';
},
/**
* Returns color representation in HSL format
* @return {String} ex: hsl(0-360,0%-100%,0%-100%)
*/
toHsl: function() {
var source = this.getSource(),
hsl = this._rgbToHsl(source[0], source[1], source[2]);
return 'hsl(' + hsl[0] + ',' + hsl[1] + '%,' + hsl[2] + '%)';
},
/**
* Returns color representation in HSLA format
* @return {String} ex: hsla(0-360,0%-100%,0%-100%,0-1)
*/
toHsla: function() {
var source = this.getSource(),
hsl = this._rgbToHsl(source[0], source[1], source[2]);
return 'hsla(' + hsl[0] + ',' + hsl[1] + '%,' + hsl[2] + '%,' + source[3] + ')';
},
/**
* Returns color representation in HEX format
* @return {String} ex: FF5555
*/
toHex: function() {
var source = this.getSource(), r, g, b;
r = source[0].toString(16);
r = (r.length === 1) ? ('0' + r) : r;
g = source[1].toString(16);
g = (g.length === 1) ? ('0' + g) : g;
b = source[2].toString(16);
b = (b.length === 1) ? ('0' + b) : b;
return r.toUpperCase() + g.toUpperCase() + b.toUpperCase();
},
/**
* Returns color representation in HEXA format
* @return {String} ex: FF5555CC
*/
toHexa: function() {
var source = this.getSource(), a;
a = Math.round(source[3] * 255);
a = a.toString(16);
a = (a.length === 1) ? ('0' + a) : a;
return this.toHex() + a.toUpperCase();
},
/**
* Gets value of alpha channel for this color
* @return {Number} 0-1
*/
getAlpha: function() {
return this.getSource()[3];
},
/**
* Sets value of alpha channel for this color
* @param {Number} alpha Alpha value 0-1
* @return {fabric.Color} thisArg
*/
setAlpha: function(alpha) {
var source = this.getSource();
source[3] = alpha;
this.setSource(source);
return this;
},
/**
* Transforms color to its grayscale representation
* @return {fabric.Color} thisArg
*/
toGrayscale: function() {
var source = this.getSource(),
average = parseInt((source[0] * 0.3 + source[1] * 0.59 + source[2] * 0.11).toFixed(0), 10),
currentAlpha = source[3];
this.setSource([average, average, average, currentAlpha]);
return this;
},
/**
* Transforms color to its black and white representation
* @param {Number} threshold
* @return {fabric.Color} thisArg
*/
toBlackWhite: function(threshold) {
var source = this.getSource(),
average = (source[0] * 0.3 + source[1] * 0.59 + source[2] * 0.11).toFixed(0),
currentAlpha = source[3];
threshold = threshold || 127;
average = (Number(average) < Number(threshold)) ? 0 : 255;
this.setSource([average, average, average, currentAlpha]);
return this;
},
/**
* Overlays color with another color
* @param {String|fabric.Color} otherColor
* @return {fabric.Color} thisArg
*/
overlayWith: function(otherColor) {
if (!(otherColor instanceof Color)) {
otherColor = new Color(otherColor);
}
var result = [],
alpha = this.getAlpha(),
otherAlpha = 0.5,
source = this.getSource(),
otherSource = otherColor.getSource(), i;
for (i = 0; i < 3; i++) {
result.push(Math.round((source[i] * (1 - otherAlpha)) + (otherSource[i] * otherAlpha)));
}
result[3] = alpha;
this.setSource(result);
return this;
}
};
/**
* Regex matching color in RGB or RGBA formats (ex: rgb(0, 0, 0), rgba(255, 100, 10, 0.5), rgba( 255 , 100 , 10 , 0.5 ), rgb(1,1,1), rgba(100%, 60%, 10%, 0.5))
* @static
* @field
* @memberOf fabric.Color
*/
// eslint-disable-next-line max-len
fabric.Color.reRGBa = /^rgba?\(\s*(\d{1,3}(?:\.\d+)?\%?)\s*,\s*(\d{1,3}(?:\.\d+)?\%?)\s*,\s*(\d{1,3}(?:\.\d+)?\%?)\s*(?:\s*,\s*((?:\d*\.?\d+)?)\s*)?\)$/i;
/**
* Regex matching color in HSL or HSLA formats (ex: hsl(200, 80%, 10%), hsla(300, 50%, 80%, 0.5), hsla( 300 , 50% , 80% , 0.5 ))
* @static
* @field
* @memberOf fabric.Color
*/
fabric.Color.reHSLa = /^hsla?\(\s*(\d{1,3})\s*,\s*(\d{1,3}\%)\s*,\s*(\d{1,3}\%)\s*(?:\s*,\s*(\d+(?:\.\d+)?)\s*)?\)$/i;
/**
* Regex matching color in HEX format (ex: #FF5544CC, #FF5555, 010155, aff)
* @static
* @field
* @memberOf fabric.Color
*/
fabric.Color.reHex = /^#?([0-9a-f]{8}|[0-9a-f]{6}|[0-9a-f]{4}|[0-9a-f]{3})$/i;
/**
* Map of the 148 color names with HEX code
* @static
* @field
* @memberOf fabric.Color
* @see: https://www.w3.org/TR/css3-color/#svg-color
*/
fabric.Color.colorNameMap = {
aliceblue: '#F0F8FF',
antiquewhite: '#FAEBD7',
aqua: '#00FFFF',
aquamarine: '#7FFFD4',
azure: '#F0FFFF',
beige: '#F5F5DC',
bisque: '#FFE4C4',
black: '#000000',
blanchedalmond: '#FFEBCD',
blue: '#0000FF',
blueviolet: '#8A2BE2',
brown: '#A52A2A',
burlywood: '#DEB887',
cadetblue: '#5F9EA0',
chartreuse: '#7FFF00',
chocolate: '#D2691E',
coral: '#FF7F50',
cornflowerblue: '#6495ED',
cornsilk: '#FFF8DC',
crimson: '#DC143C',
cyan: '#00FFFF',
darkblue: '#00008B',
darkcyan: '#008B8B',
darkgoldenrod: '#B8860B',
darkgray: '#A9A9A9',
darkgrey: '#A9A9A9',
darkgreen: '#006400',
darkkhaki: '#BDB76B',
darkmagenta: '#8B008B',
darkolivegreen: '#556B2F',
darkorange: '#FF8C00',
darkorchid: '#9932CC',
darkred: '#8B0000',
darksalmon: '#E9967A',
darkseagreen: '#8FBC8F',
darkslateblue: '#483D8B',
darkslategray: '#2F4F4F',
darkslategrey: '#2F4F4F',
darkturquoise: '#00CED1',
darkviolet: '#9400D3',
deeppink: '#FF1493',
deepskyblue: '#00BFFF',
dimgray: '#696969',
dimgrey: '#696969',
dodgerblue: '#1E90FF',
firebrick: '#B22222',
floralwhite: '#FFFAF0',
forestgreen: '#228B22',
fuchsia: '#FF00FF',
gainsboro: '#DCDCDC',
ghostwhite: '#F8F8FF',
gold: '#FFD700',
goldenrod: '#DAA520',
gray: '#808080',
grey: '#808080',
green: '#008000',
greenyellow: '#ADFF2F',
honeydew: '#F0FFF0',
hotpink: '#FF69B4',
indianred: '#CD5C5C',
indigo: '#4B0082',
ivory: '#FFFFF0',
khaki: '#F0E68C',
lavender: '#E6E6FA',
lavenderblush: '#FFF0F5',
lawngreen: '#7CFC00',
lemonchiffon: '#FFFACD',
lightblue: '#ADD8E6',
lightcoral: '#F08080',
lightcyan: '#E0FFFF',
lightgoldenrodyellow: '#FAFAD2',
lightgray: '#D3D3D3',
lightgrey: '#D3D3D3',
lightgreen: '#90EE90',
lightpink: '#FFB6C1',
lightsalmon: '#FFA07A',
lightseagreen: '#20B2AA',
lightskyblue: '#87CEFA',
lightslategray: '#778899',
lightslategrey: '#778899',
lightsteelblue: '#B0C4DE',
lightyellow: '#FFFFE0',
lime: '#00FF00',
limegreen: '#32CD32',
linen: '#FAF0E6',
magenta: '#FF00FF',
maroon: '#800000',
mediumaquamarine: '#66CDAA',
mediumblue: '#0000CD',
mediumorchid: '#BA55D3',
mediumpurple: '#9370DB',
mediumseagreen: '#3CB371',
mediumslateblue: '#7B68EE',
mediumspringgreen: '#00FA9A',
mediumturquoise: '#48D1CC',
mediumvioletred: '#C71585',
midnightblue: '#191970',
mintcream: '#F5FFFA',
mistyrose: '#FFE4E1',
moccasin: '#FFE4B5',
navajowhite: '#FFDEAD',
navy: '#000080',
oldlace: '#FDF5E6',
olive: '#808000',
olivedrab: '#6B8E23',
orange: '#FFA500',
orangered: '#FF4500',
orchid: '#DA70D6',
palegoldenrod: '#EEE8AA',
palegreen: '#98FB98',
paleturquoise: '#AFEEEE',
palevioletred: '#DB7093',
papayawhip: '#FFEFD5',
peachpuff: '#FFDAB9',
peru: '#CD853F',
pink: '#FFC0CB',
plum: '#DDA0DD',
powderblue: '#B0E0E6',
purple: '#800080',
rebeccapurple: '#663399',
red: '#FF0000',
rosybrown: '#BC8F8F',
royalblue: '#4169E1',
saddlebrown: '#8B4513',
salmon: '#FA8072',
sandybrown: '#F4A460',
seagreen: '#2E8B57',
seashell: '#FFF5EE',
sienna: '#A0522D',
silver: '#C0C0C0',
skyblue: '#87CEEB',
slateblue: '#6A5ACD',
slategray: '#708090',
slategrey: '#708090',
snow: '#FFFAFA',
springgreen: '#00FF7F',
steelblue: '#4682B4',
tan: '#D2B48C',
teal: '#008080',
thistle: '#D8BFD8',
tomato: '#FF6347',
turquoise: '#40E0D0',
violet: '#EE82EE',
wheat: '#F5DEB3',
white: '#FFFFFF',
whitesmoke: '#F5F5F5',
yellow: '#FFFF00',
yellowgreen: '#9ACD32'
};
/**
* @private
* @param {Number} p
* @param {Number} q
* @param {Number} t
* @return {Number}
*/
function hue2rgb(p, q, t) {
if (t < 0) {
t += 1;
}
if (t > 1) {
t -= 1;
}
if (t < 1 / 6) {
return p + (q - p) * 6 * t;
}
if (t < 1 / 2) {
return q;
}
if (t < 2 / 3) {
return p + (q - p) * (2 / 3 - t) * 6;
}
return p;
}
/**
* Returns new color object, when given a color in RGB format
* @memberOf fabric.Color
* @param {String} color Color value ex: rgb(0-255,0-255,0-255)
* @return {fabric.Color}
*/
fabric.Color.fromRgb = function(color) {
return Color.fromSource(Color.sourceFromRgb(color));
};
/**
* Returns array representation (ex: [100, 100, 200, 1]) of a color that's in RGB or RGBA format
* @memberOf fabric.Color
* @param {String} color Color value ex: rgb(0-255,0-255,0-255), rgb(0%-100%,0%-100%,0%-100%)
* @return {Array} source
*/
fabric.Color.sourceFromRgb = function(color) {
var match = color.match(Color.reRGBa);
if (match) {
var r = parseInt(match[1], 10) / (/%$/.test(match[1]) ? 100 : 1) * (/%$/.test(match[1]) ? 255 : 1),
g = parseInt(match[2], 10) / (/%$/.test(match[2]) ? 100 : 1) * (/%$/.test(match[2]) ? 255 : 1),
b = parseInt(match[3], 10) / (/%$/.test(match[3]) ? 100 : 1) * (/%$/.test(match[3]) ? 255 : 1);
return [
parseInt(r, 10),
parseInt(g, 10),
parseInt(b, 10),
match[4] ? parseFloat(match[4]) : 1
];
}
};
/**
* Returns new color object, when given a color in RGBA format
* @static
* @function
* @memberOf fabric.Color
* @param {String} color
* @return {fabric.Color}
*/
fabric.Color.fromRgba = Color.fromRgb;
/**
* Returns new color object, when given a color in HSL format
* @param {String} color Color value ex: hsl(0-260,0%-100%,0%-100%)
* @memberOf fabric.Color
* @return {fabric.Color}
*/
fabric.Color.fromHsl = function(color) {
return Color.fromSource(Color.sourceFromHsl(color));
};
/**
* Returns array representation (ex: [100, 100, 200, 1]) of a color that's in HSL or HSLA format.
* Adapted from <a href="https://rawgithub.com/mjijackson/mjijackson.github.com/master/2008/02/rgb-to-hsl-and-rgb-to-hsv-color-model-conversion-algorithms-in-javascript.html">https://github.com/mjijackson</a>
* @memberOf fabric.Color
* @param {String} color Color value ex: hsl(0-360,0%-100%,0%-100%) or hsla(0-360,0%-100%,0%-100%, 0-1)
* @return {Array} source
* @see http://http://www.w3.org/TR/css3-color/#hsl-color
*/
fabric.Color.sourceFromHsl = function(color) {
var match = color.match(Color.reHSLa);
if (!match) {
return;
}
var h = (((parseFloat(match[1]) % 360) + 360) % 360) / 360,
s = parseFloat(match[2]) / (/%$/.test(match[2]) ? 100 : 1),
l = parseFloat(match[3]) / (/%$/.test(match[3]) ? 100 : 1),
r, g, b;
if (s === 0) {
r = g = b = l;
}
else {
var q = l <= 0.5 ? l * (s + 1) : l + s - l * s,
p = l * 2 - q;
r = hue2rgb(p, q, h + 1 / 3);
g = hue2rgb(p, q, h);
b = hue2rgb(p, q, h - 1 / 3);
}
return [
Math.round(r * 255),
Math.round(g * 255),
Math.round(b * 255),
match[4] ? parseFloat(match[4]) : 1
];
};
/**
* Returns new color object, when given a color in HSLA format
* @static
* @function
* @memberOf fabric.Color
* @param {String} color
* @return {fabric.Color}
*/
fabric.Color.fromHsla = Color.fromHsl;
/**
* Returns new color object, when given a color in HEX format
* @static
* @memberOf fabric.Color
* @param {String} color Color value ex: FF5555
* @return {fabric.Color}
*/
fabric.Color.fromHex = function(color) {
return Color.fromSource(Color.sourceFromHex(color));
};
/**
* Returns array representation (ex: [100, 100, 200, 1]) of a color that's in HEX format
* @static
* @memberOf fabric.Color
* @param {String} color ex: FF5555 or FF5544CC (RGBa)
* @return {Array} source
*/
fabric.Color.sourceFromHex = function(color) {
if (color.match(Color.reHex)) {
var value = color.slice(color.indexOf('#') + 1),
isShortNotation = (value.length === 3 || value.length === 4),
isRGBa = (value.length === 8 || value.length === 4),
r = isShortNotation ? (value.charAt(0) + value.charAt(0)) : value.substring(0, 2),
g = isShortNotation ? (value.charAt(1) + value.charAt(1)) : value.substring(2, 4),
b = isShortNotation ? (value.charAt(2) + value.charAt(2)) : value.substring(4, 6),
a = isRGBa ? (isShortNotation ? (value.charAt(3) + value.charAt(3)) : value.substring(6, 8)) : 'FF';
return [
parseInt(r, 16),
parseInt(g, 16),
parseInt(b, 16),
parseFloat((parseInt(a, 16) / 255).toFixed(2))
];
}
};
/**
* Returns new color object, when given color in array representation (ex: [200, 100, 100, 0.5])
* @static
* @memberOf fabric.Color
* @param {Array} source
* @return {fabric.Color}
*/
fabric.Color.fromSource = function(source) {
var oColor = new Color();
oColor.setSource(source);
return oColor;
};
})(typeof exports !== 'undefined' ? exports : this);