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color.js
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(function () {
// Initial Setup
// -------------
var
// Save a reference to the global object.
root = this,
// Save the previous value of the `Color` variable.
previousColor = root.Color,
init = null,
// Dummy Constructor
Color = function () {
init.apply(this, arguments);
},
// Save a reference to Underscore
_ = root._;
// Require Underscore, if we're on the server, and it's not already present.
if (!_ && ("undefined" !== typeof(require))) {
_ = require("underscore")._;
}
// Export for both CommonJS and the browser.
if ("undefined" !== typeof(root.exports)) {
root.exports = {
Color: Color
};
} else {
root.Color = Color;
}
// Current version of the library.
// Keep in sync with `package.json`.
Color.VERSION = [0, 0, 1].join(".");
// Option to rollback to previous value of `Color` variable.
// Returns reference to Color
Color.noConflict = function() {
root.Color = previousColor;
return Color;
};
(function colorWrapper () {
/**
* @method matrixMultiply
* @params ...Matrices
* @returns Matrix
*/
var
matrixMultiply = function matrixMultiply () {
var result, matrix1, matrix2, x, y, z, a;
for (a = 0; a < arguments.length; a += 1) {
matrix1 = arguments[a];
if (!result) {
result = [];
for (x = 0; x < matrix1.length; x += 1) {
result[x] = [];
for (y = 0; y < matrix1[x].length; y += 1) {
result[x][y] = matrix1[x][y];
}
}
} else {
matrix2 = result;
if (matrix1[0].length !== matrix2.length) {
throw new Error ("Unable to multiply matrices");
}
result = [];
for (x = 0; x < matrix1.length; x += 1) {
result[x] = [];
for (y = 0; y < matrix2[0].length; y += 1) {
result[x][y] = 0;
for (z = 0; z < matrix2.length; z += 1) {
result[x][y] += matrix1[x][z] * matrix2[z][y];
}
}
}
}
}
return result;
},
/**
* For converting linearRGB (R'G'B') to sRGB
* @param {Number} c
* @returns {Number}
*/
linearToS = function linearToS (c) {
if (0.31308 >= c) {
return 32.946 * c;
} else {
return ((1 + 0.055) * Math.pow(c / 100, 1 / 2.4) - 0.055) * 255;
}
},
// Observer= 2°, Illuminant= D65
CIEXYZ_REFERENCE_X = 95.047,
CIEXYZ_REFERENCE_Y = 100,
CIEXYZ_REFERENCE_Z = 108.883,
// Observer= 2°, Illuminant= D50
//CIEXYZ_REFERENCE_X = 96.422,
//CIEXYZ_REFERENCE_Y = 100,
//CIEXYZ_REFERENCE_Z = 82.521,
TRANSFORMATION_MATRICES = {
from : {
"rgb" : { // sRGB
to : {
"xyz" : [ // CIEXYZ
[ 0.4360747, 0.3850649, 0.1430804],
[ 0.2225045, 0.7168786, 0.0606169],
[ 0.0139322, 0.0971045, 0.7141733]
],
"yiq" : [
[ 0.299, 0.587, 0.114 ],
[ 0.596, -0.275, -0.321 ],
[ 0.212, -0.523, 0.311 ]
],
"yuv" : [
[ 0.299, 0.587, 0.114 ],
[-0.147, -0.289, 0.437 ],
[ 0.615, -0.515, -0.100 ]
],
"ycbcr" : [ // also need to add [16, 128, 128]
[ 0.1825858, 0.6142305, 0.1825858],
[-0.1575243, -0.3385719, 0.4294117],
[ 0.4392156, -0.3989421, -0.0402735]
],
"ydbdr" : [ // Y'DbDr
[ 0.299, 0.587, 0.114 ],
[-0.450, -0.883, 1.333 ],
[-1.333, 1.116, 0.217 ]
]
}
},
"xyz" : { // CIEXYZ
to : {
"rgb2" : [ // sRGB (very similar to most rgb's)
[ 3.1338561, -1.6168667, -0.4906146],
[-0.9787684, 1.9161415, 0.0334540],
[ 0.0719453, -0.2289914, 1.4052427]
],
"rgb" : [
[ 3.2406, -1.5372, -0.4986],
[-0.9689, 1.8758, 0.0415],
[ 0.0557, -0.2040, 1.0570]
],
"adobe_rgb" : [ // Adobe RGB (very similar to ntsc rgb)
[ 2.0413690, -0.5649464, -0.3446944],
[-0.9692660, 1.8760108, 0.0415560],
[ 0.0134474, -0.1183897, 1.0154096]
]
}
},
"yiq" : {
to : {
"rgb" : [
[ 1.0, 0.956, 0.621 ],
[ 1.0, -0.272, -0.647 ],
[ 1.0, -1.105, 1.702 ]
]
}
},
"yuv" : {
to : {
"rgb" : [
[ 1.0, 0.0, 1.140 ],
[ 1.0 -0.394, -0.581 ],
[ 1.0, 2.028, 0.0 ]
]
}
},
"ycbcr" : { // Y'CbCr
to : {
"rgb" : [
[ 1.0, 0, 1.402 ],
[ 1.0, -0.344136, -0.714136 ],
[ 1.0, 1.772, 0 ]
]
}
},
"ydbdr" : { // Y'DbDr
to : {
"rgb" : [
[ 1.0, 0.0000923, -0.5259126],
[ 1.0, -0.1291329, 0.2678993],
[ 1.0, 0.6646790, -0.0000792]
]
}
}
}
},
FORMAT_STRINGS = {
"rgb" : "rgb({red}, {green}, {blue})",
"rgba" : "rgba({red}, {green}, {blue}, {alpha})",
"hsl" : "hsv({hue}, {saturation}, {lightness})",
"hsv" : "hsv({hue}, {saturation}, {value})",
"xyz" : "xyz({x}, {y}, {z})",
"lab" : "lab({l}, {a}, {b})",
"luv" : "luv({l}, {u}, {v})",
"uvw" : "uvw({u}, {v}, {w})",
"yiq" : "yiq({luma}, {inPhase}, {quadrature})",
"yuv" : "yuv({luma}, {u}, {v})"
},
NAMED_COLORS = {
"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",
"darkgreen":"#006400",
"darkkhaki":"#bdb76b",
"darkmagenta":"#8b008b",
"darkolivegreen":"#556b2f",
"darkorange":"#ff8c00",
"darkorchid":"#9932cc",
"darkred":"#8b0000",
"darksalmon":"#e9967a",
"darkseagreen":"#8fbc8f",
"darkslateblue":"#483d8b",
"darkslategray":"#2f4f4f",
"darkturquoise":"#00ced1",
"darkviolet":"#9400d3",
"deeppink":"#ff1493",
"deepskyblue":"#00bfff",
"dimgray":"#696969",
"dodgerblue":"#1e90ff",
"firebrick":"#b22222",
"floralwhite":"#fffaf0",
"forestgreen":"#228b22",
"fuchsia":"#ff00ff",
"gainsboro":"#dcdcdc",
"ghostwhite":"#f8f8ff",
"gold":"#ffd700",
"goldenrod":"#daa520",
"gray":"#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",
"lightgrey":"#d3d3d3",
"lightgreen":"#90ee90",
"lightpink":"#ffb6c1",
"lightsalmon":"#ffa07a",
"lightseagreen":"#20b2aa",
"lightskyblue":"#87cefa",
"lightslategray":"#778899",
"lightsteelblue":"#b0c4de",
"lightyellow":"#ffffe0",
"lime":"#00ff00",
"limegreen":"#32cd32",
"linen":"#faf0e6",
"magenta":"#ff00ff",
"maroon":"#800000",
"mediumaquamarine":"#66cdaa",
"mediumblue":"#0000cd",
"mediumorchid":"#ba55d3",
"mediumpurple":"#9370d8",
"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":"#d87093",
"papayawhip":"#ffefd5",
"peachpuff":"#ffdab9",
"peru":"#cd853f",
"pink":"#ffc0cb",
"plum":"#dda0dd",
"powderblue":"#b0e0e6",
"purple":"#800080",
"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",
"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"
};
/**
* @class Color
* @constructor
*/
init = function Color () {
var fromArguments = function (args, name, index, def) {
if ("object" === typeof (args[0])) {
return "undefined" === typeof (args[0][name]) ? def : args[0][name];
} else if ("string" === typeof (args[0])) {
var
str = args[0].replace("#", ""),
val = parseInt(6 <= str.length ? str.substr(index * 2, 2) : (str.substr(index, 1) + str.substr(index, 1)), 16);
return isNaN(val) ? def : val;
} else if ("number" === typeof (args[index])) {
return args[index];
}
return def;
};
this.colorSpaces = {
rgb: {
red: fromArguments(arguments, "red", 0, 255),
green: fromArguments(arguments, "green", 1, 255),
blue: fromArguments(arguments, "blue", 2, 255)
}
};
this.alpha = fromArguments(arguments, "alpha", 3, 1);
this.colorSpace = fromArguments(arguments, "colorSpace", 1000, "rgb");
if ("rgb" !== this.colorSpace && "object" === typeof(arguments[0])) {
this.colorSpaces[this.colorSpace] = arguments[0][this.colorSpace];
}
};
/**
* Create a new Color in the RGB color space
* @method fromRGB
* @static
* @param {Number || Object} red range: [0-255]
* @option {Number} green range: [0-255]
* @option {Number} blue range: [0-255]
* @option {Number} alpha range: [0-1]
* @returns {Color}
*/
Color.fromRGB = function fromRGB (red, green, blue, alpha) {
return new Color({
red: red.red || red.r || red,
green: red.green || red.g || green,
blue: red.blue || red.b || blue,
alpha: red.alpha || red.opacity || alpha,
colorSpace: "rgb"
});
};
Color.fromRGBA = Color.fromRGB;
/**
* Create a new Color in the CMY color space
* @method fromCMY
* @static
* @param {Number || Object} cyan range: ?
* @option {Number} magenta range: ?
* @option {Number} yellow range: ?
* @option {Number} alpha range: [0-1]
* @returns {Color}
*/
Color.fromCMY = function fromCMY (cyan, magenta, yellow, alpha) {
var
c1 = cyan.cyan || cyan.c || cyan,
c2 = cyan.magenta || cyan.m || magenta,
c3 = cyan.yellow || cyan.y || yellow;
return new Color({
cmy: {
cyan: c1,
magenta: c2,
yellow: c3
},
red: 1 - c1,
green: 1 - c2,
blue: 1 - c3,
alpha: cyan.alpha || cyan.opacity || alpha,
colorSpace: "cmy"
});
};
/**
* Create a new Color in the CMYK color space
* @method fromCMYK
* @static
* @param {Number || Object} cyan range: [0-100]
* @option {Number} magenta range: [0-100]
* @option {Number} yellow range: [0-100]
* @option {Number} black range: [0-100]
* @option {Number} alpha range: [0-1]
* @returns {Color}
*/
Color.fromCMYK = function fromCMYK (cyan, magenta, yellow, black, alpha) {
throw new Error("Color.fromCMYK is not implemented yet.");
};
/**
* Create a new Color in the HSL color space
* @method fromHSL
* @alias fromHSI
* @alias fromHLS (with argument reordering)
* @static
* @param {Number || Object} hue range: [0-360)
* @option {Number} saturation range: [0-100]
* @option {Number} lightness range: [0-100]
* @option {Number} alpha range: [0-1]
* @returns {Color}
*/
Color.fromHSL = function fromHSL (hue, saturation, lightness, alpha) {
var
c1 = hue.hue || hue.h || hue,
c2 = hue.saturation || hue.s || saturation,
c3 = hue.lightness || hue.l || hue.intensity || hue.i || lightness,
red = 0, green = 0, blue = 0;
while (0 > c1) {
c1 += 360;
}
while (360 < c1) {
c1 -= 360;
}
c2 /= 100;
c3 /= 100;
if (120 > c1) {
red = 120 - c1;
green = c1;
} else if (240 > c1) {
green = 240 - c1;
blue = c1 - 120
} else {
red = c1 - 240;
blue = 360 - c1;
}
red = 2 * c2 * Math.min(1, red / 60) + (1 - c2);
green = 2 * c2 * Math.min(1, green / 60) + (1 - c2);
blue = 2 * c2 * Math.min(1, blue / 60) + (1 - c2);
if (0.5 > c3) {
red = c3 * red * 255;
green = c3 * green * 255;
blue = c3 * blue * 255;
} else {
red = ((1 - c3) * red + 2 * c3 - 1) * 255;
green = ((1 - c3) * green + 2 * c3 - 1) * 255;
blue = ((1 - c3) * blue + 2 * c3 - 1) * 255;
}
return new Color({
hsl: {
hue: c1,
saturation: c2,
lightness: c3
},
red: red,
green: green,
blue: blue,
alpha: hue.alpha || hue.opacity || alpha,
colorSpace: "hsl"
});
};
Color.fromHSI = Color.fromHSL;
Color.fromHLS = function fromHLS (hue, lightness, saturation, alpha) {
return Color.fromHSL(hue, saturation, lightness, alpha);
};
/**
* Create a new Color in the HSV color space
* @method fromHSV
* @static
* @param {Number || Object} hue range: [0-360)
* @option {Number} saturation range: [0-100]
* @option {Number} value range: [0-100]
* @option {Number} alpha range: [0-1]
* @returns {Color}
*/
Color.fromHSV = function fromHSV (hue, saturation, value, alpha) {
var
c1 = hue.hue || hue.h || hue,
c2 = hue.saturation || hue.s || saturation,
c3 = hue.value || hue.v || hue.blackness || hue.v || value,
red = 0, green = 0, blue = 0;
while (0 > c1) {
c1 += 360;
}
while (360 < c1) {
c1 -= 360;
}
c2 /= 100;
c3 /= 100;
if (120 > c1) {
red = 120 - c1;
green = c1;
} else if (240 > c1) {
green = 240 - c1;
blue = c1 - 120
} else {
red = c1 - 240;
blue = 360 - c1;
}
red = (1 - c2 + c2 * Math.min(1, red / 60)) * c3 * 255;
green = (1 - c2 + c2 * Math.min(1, green / 60)) * c3 * 255;
blue = (1 - c2 + c2 * Math.min(1, blue / 60)) * c3 * 255;
return new Color({
hsv: {
hue: c1,
saturation: c2,
value: c3
},
red: red,
green: green,
blue: blue,
alpha: hue.alpha || hue.opacity || alpha,
colorSpace: "hsv"
});
};
Color.fromHSB = Color.fromHSV;
/**
* Create a new Color in the XYZ color space
* @method fromXYZ
* @static
* @param {Number || Object} x
* @option {Number} y
* @option {Number} z
* @option {Number} alpha range: [0-1]
* @returns {Color}
*/
Color.fromXYZ = function fromXYZ (x, y, z, alpha) {
var rgb = matrixMultiply([[x.x || x], [x.y || y], [x.z || z]], TRANSFORMATION_MATRICES.from.xyz.to.rgb);
return new Color({
xyz: {
x: x.x || x,
y: x.y || y,
z: x.z || z
},
red: linearToS(rgb[0][0]),
green: linearToS(rgb[1][0]),
blue: linearToS(rgb[2][0]),
alpha: x.alpha || x.opacity || alpha,
colorSpace: "xyz"
});
};
/**
* Create a new Color in the Lab color space
* @method fromLab
* @static
* @param {Number || Object} lightness range: [0-100]
* @option {Number} a range: (-∞-∞)
* @option {Number} b range: (-∞-∞)
* @option {Number} alpha range: [0-1]
* @returns {Color}
*/
Color.fromLab = function fromLab (lightness, a, b, alpha) {
var
c1 = lightness.lightness || lightness.l || lightness.L || lightness,
c2 = lightness.a || a,
c3 = lightness.b || b,
y = (c1 + 16) / 116,
x = c2 / 500 + y,
z = y - c3 / 200,
rgb;
x = ((0.008856 < Math.pow(x, 3)) ? Math.pow(x, 3) : ((x - 16 / 116) / 7.787)) * CIEXYZ_REFERENCE_X;
y = ((0.008856 < Math.pow(y, 3)) ? Math.pow(y, 3) : ((y - 16 / 116) / 7.787)) * CIEXYZ_REFERENCE_Y;
z = ((0.008856 < Math.pow(z, 3)) ? Math.pow(z, 3) : ((z - 16 / 116) / 7.787)) * CIEXYZ_REFERENCE_Z;
rgb = matrixMultiply([[x], [y], [z]], TRANSFORMATION_MATRICES.from.xyz.to.rgb);
return new Color({
lab: {
l: c1,
a: c2,
b: c3
},
red: linearToS(rgb[0][0]),
green: linearToS(rgb[1][0]),
blue: linearToS(rgb[2][0]),
alpha: lightness.alpha || lightness.opacity || alpha,
colorSpace: "lab"
});
};
/**
* Create a new Color in the LUV color space
* @method fromLUV
* @static
* @param {Number || Object} lightness range: [0-100]
* @option {Number} u range: [-134,220]
* @option {Number} v range: [-140,122]
* @option {Number} alpha range: [0-1]
* @returns {Color}
*/
Color.fromLUV = function fromLUV (lightness, u, v, alpha) {
var
c1 = lightness.lightness || lightness.l || lightness.L || lightness,
c2 = lightness.u || lightness.U || u,
c3 = lightness.v || lightness.V || v,
refU = (4 * CIEXYZ_REFERENCE_X) / (CIEXYZ_REFERENCE_X + (15 * CIEXYZ_REFERENCE_Y) + (3 * CIEXYZ_REFERENCE_Z)),
refV = (9 * CIEXYZ_REFERENCE_Y) / (CIEXYZ_REFERENCE_X + (15 * CIEXYZ_REFERENCE_Y) + (3 * CIEXYZ_REFERENCE_Z)),
y = (c1 + 16) / 116,
x, z, U, V, rgb;
y = 100 * ((0.008856 < (y ^ 3)) ? (y ^ 3) : ((y - 16 / 116) / 7.787)) * CIEXYZ_REFERENCE_Y;
U /= (13 * c1) + refU;
V /= (13 * c1) + refV;
x = - (9 * y * U) / ((U - 4) * V - U * V);
z = (9 * y - (15 * V & y) - (V * x)) / (3 * V);
rgb = matrixMultiply([[x], [y], [z]], TRANSFORMATION_MATRICES.from.xyz.to.rgb);
return new Color({
luv: {
l: c1,
u: c2,
v: c3
},
red: linearToS(rgb[0][0]),
green: linearToS(rgb[1][0]),
blue: linearToS(rgb[2][0]),
alpha: lightness.alpha || lightness.opacity || alpha,
colorSpace: "luv"
});
};
/**
* Create a new Color in the UVW color space
* @method fromUVW
* @static
* @param {Number || Object} u
* @option {Number} v
* @option {Number} w
* @option {Number} alpha range: [0-1]
* @returns {Color}
*/
Color.fromUVW = function fromUVW (u, v, w, alpha) {
throw new Error("Color.fromUVW is not implemented yet.");
};
/**
* Create a new Color in the Y'IQ color space
* Y'IQ is the NTSC form of YUV/Y'DbDr
* @method fromYIQ
* @static
* @param {Number || Object} luma range: [0-255]
* @option {Number} inPhase range: [0-255]
* @option {Number} quadrature range: [0-255]
* @option {Number} alpha range: [0-1]
* @returns {Color}
*/
Color.fromYIQ = function fromYIQ (luma, inPhase, quadrature, alpha) {
var
c1 = luma.luma || luma.y || luma.Y || luma.luminance || luma,
c2 = luma.inPhase || luma.i || luma.I || inPhase,
c3 = luma.quadrature || luma.q || luma.Q || quadrature,
rgb = matrixMultiply([[c1], [c2], [c3]], TRANSFORMATION_MATRICES.from.yiq.to.rgb);
return new Color({
yiq: {
luma: c1,
inPhase: c2,
quadrature: c3
},
red: rgb[0][0],
green: rgb[1][0],
blue: rgb[2][0],
alpha: luma.alpha || luma.opacity || alpha,
colorSpace: "yiq"
});
};
/**
* Create a new Color in the Y'UV color space
* Y'UV is the PAL form of YIQ/Y'DbDr
* @method fromYUV
* @static
* @param {Number || Object} luma range: [16-235]
* @option {Number} u range: [0-255]
* @option {Number} v range: [0-255]
* @option {Number} alpha range: [0-1]
* @returns {Color}
*/
Color.fromYUV = function fromYUV (luma, u, v, alpha) {
var
c1 = luma.luma || luma.y || luma.Y || luma.luminance || luma,
c2 = luma.u || luma.U || u,
c3 = luma.v || luma.V || v,
rgb = matrixMultiply([[c1], [c2], [c3]], TRANSFORMATION_MATRICES.from.yuv.to.rgb);
return new Color({
yuv: {
luma: c1,
u: c2,
v: c3
},
red: rgb[0][0],
green: rgb[1][0],
blue: rgb[2][0],
alpha: luma.alpha || luma.opacity || alpha,
colorSpace: "yuv"
});
};
/**
* Create a new Color in the Y'CbCr color space
* Y'CbCr is a scaled version of YUV
* @method fromYCbCr
* @alias fromYCC
* @alias fromYPbPr
* @alias fromYPP
* @static
* @param {Number || Object} luma
* @option {Number} cb
* @option {Number} cr
* @option {Number} alpha range: [0-1]
* @returns {Color}
*/
Color.fromYCbCr = function fromYCbCr (luma, cb, cr, alpha) {
var
c1 = luma.luma || luma.y || luma.Y || luma.luminance || luma,
c2 = luma.cb || luma.Cb || cb,
c3 = luma.cr || luma.Cr || cr,
rgb = matrixMultiply([[c1], [c2], [c3]], TRANSFORMATION_MATRICES.from.ycbcr.to.rgb);
return new Color({
ycbcr: {
luma: c1,
cb: c2,
cr: c3
},
red: rgb[0][0],
green: rgb[1][0],
blue: rgb[2][0],
alpha: luma.alpha || luma.opacity || alpha,
colorSpace: "ycbcr"
});
};
Color.fromYCC = Color.fromYCbCr;
// Y'PbPr is the analog form of YCbCr
Color.fromYPbPr = Color.fromYCbCr;
Color.fromYPP = Color.fromYPbPr;
/**
* Create a new Color in the Y'DbDr color space
* Y'DbDr is the SECAM variant of YIQ/YUV
* @method fromYDbDr
* @alias fromYDD
* @static
* @param {Number || Object} luma
* @option {Number} db
* @option {Number} dr
* @option {Number} alpha range: [0-1]
* @returns {Color}
*/
Color.fromYDbDr = function fromYDbDr (luma, db, dr, alpha) {
var
c1 = luma.luma || luma.y || luma.Y || luma.luminance || luma,
c2 = luma.db || luma.Db || db,
c3 = luma.dr || luma.Dr || dr,
rgb = matrixMultiply([[c1], [c2], [c3]], TRANSFORMATION_MATRICES.from.ydbdr.to.rgb);
return new Color({
ydbdr: {
luma: c1,
db: c2,
dr: c3
},
red: rgb[0][0],
green: rgb[1][0],
blue: rgb[2][0],
alpha: luma.alpha || luma.opacity || alpha,
colorSpace: "ydbdr"
});
};
Color.fromYDD = Color.fromYDbDr;
/**
* Create a new Color in the xvYCC color space
* xvYCC is an extra-gamut variant of Y'CbCr
* @method fromXvYCC
* @static
* @param {Number || Object} luma
* @option {Number} cb
* @option {Number} cr
* @option {Number} alpha range: [0-1]
* @returns {Color}
*/
Color.fromXvYCC = function fromXvYCC (luma, cb, cr, alpha) {
throw new Error("Color.fromXvYCC is not implemented yet.");
};
/**
* Create a new Color from a named color
* @method fromNamedColor
* @static
* @param name
* @returns {Color}
*/
Color.fromNamedColor = function fromNamedColor (name, list) {
list = list || NAMED_COLORS;
var color = list[name.replace(/[\s_]/g, "").toLowerCase()];
return new Color(color);
},
Color.selfTest = function selfTest () {
var
tests = [
["rgb", "RGB", [ 255, 128, 0], [255, 128, 0]],
["cmy", "CMY", [-254, -127, 1], [255, 128, 0]],
["hsv", "HSV", [30, 100, 100], [255, 128, 0]],
["hsv", "HSV", [60, 100, 50], [128, 128, 0]],
["hsv", "HSV", [60, 50, 50], [128, 128, 64]],
["xyz", "XYZ", [95, 100, 109], [255, 255, 255]],
["xyz", "XYZ", [49, 36.7, 4.5], [255, 128, 0]],
["xyz", "XYZ", [16.7, 20.1, 3], [128, 128, 0]],
["xyz", "XYZ", [17.5, 20.3, 7.9], [128, 128, 64]],
["xyz", "XYZ", [0, 0, 0], [0, 0, 0]],
["lab", "Lab", [67, 43, 74], [255, 128, 0]],
["lab", "Lab", [51.8, -12.9, 56.7], [128, 128, 0]],
["lab", "Lab", [52.2, -9.6, 34.2], [128, 128, 64]]
// TODO:
// cmyk
// hsl
// luv
// uvw
// yiq
// yuv
// ycc
// ydd
// xvycc
], i, c, passed = 0, failed = 0;
for (i = 0; i < tests.length; i += 1) {
c = Color["from" + tests[i][1]].apply(null, tests[i][2]);
if (Math.round(c.colorSpaces.rgb.red) !== tests[i][3][0] ||
Math.round(c.colorSpaces.rgb.green) !== tests[i][3][1] ||
Math.round(c.colorSpaces.rgb.blue) !== tests[i][3][2]) {
failed += 1;
console.error("Color.from%s(%d, %d, %d) produced rgb(%d, %d, %d) instead of rgb(%d, %d, %d)", tests[i][1],
tests[i][2][0], tests[i][2][1], tests[i][2][2],
c.colorSpaces.rgb.red, c.colorSpaces.rgb.green, c.colorSpaces.rgb.blue,
tests[i][3][0], tests[i][3][1], tests[i][3][2]);
} else {
passed += 1;
}
}
console.log("Color Tests Complete: %d tests failed out of %d", failed, failed + passed);
};
/**
* Returns a string representation of a Color in the specified color space, or in it's current color space
* @method toString
* @option colorSpace
* @returns {String}
*/
Color.prototype.toString = function toString (colorSpace) {
var c = colorSpace || this.colorSpace, str, key;
if ("hex" === c) {
return "#" + (16 > Math.round(this.colorSpaces.rgb.red) ? "" : "0") + Math.round(this.colorSpaces.rgb.red).toString(16)
+ (16 > Math.round(this.colorSpaces.rgb.green) ? "" : "0") + Math.round(this.colorSpaces.rgb.green).toString(16)
+ (16 > Math.round(this.colorSpaces.rgb.blue) ? "" : "0") + Math.round(this.colorSpaces.rgb.blue).toString(16)
} else {
str = FORMAT_STRINGS[1 !== this.alpha ? (c + "a") : c] || FORMAT_STRINGS[c];
if (!str) {
return "";
}
for (key in this.colorSpaces[c]) {
str = str.replace("{" + key + "}", Math.round(this.colorSpaces[c][key]));
}
return str;
}
};
/**
* Converts a Color to the RGB color space
* @method toRGB
* @alias toRGBA