bebraw
1/11/2011 - 6:56 PM
Simple color utils for JavaScript
Simple color utils for JavaScript
/**
* A class to parse color values
* @author Stoyan Stefanov <sstoo@gmail.com>
* @link http://www.phpied.com/rgb-color-parser-in-javascript/
* @license Use it if you like it
*/
/*
I've modded this class a bit. It's not perfect but does many cool things already! Feel free to hack as you like.
Note that I have wrapped the class and one utility func in RequireJS module format.
*/
define(function() {
function Color(colorString) {
this.init(colorString);
}
Color.prototype = {
init: function(colorString) {
if ( colorString == undefined ) {
colorString = 'black';
}
// strip any leading #
if (colorString.charAt(0) == '#') { // remove # if any
colorString = colorString.substr(1,6);
}
colorString = colorString.replace(/ /g,'');
colorString = colorString.toLowerCase();
// before getting into regexps, try simple matches
// and overwrite the input
var simple_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',
feldspar: 'd19275',
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',
lightslateblue: '8470ff',
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',
violetred: 'd02090',
wheat: 'f5deb3',
white: 'ffffff',
whitesmoke: 'f5f5f5',
yellow: 'ffff00',
yellowgreen: '9acd32'
};
for (var key in simple_colors) {
if (colorString == key) {
colorString = simple_colors[key];
}
}
// emd of simple type-in colors
// array of color definition objects
var color_defs = [
{
re: /^rgb\((\d{1,3}),\s*(\d{1,3}),\s*(\d{1,3})\)$/,
example: ['rgb(123, 234, 45)', 'rgb(255,234,245)'],
process: function (bits){
return [
parseInt(bits[1]),
parseInt(bits[2]),
parseInt(bits[3])
];
}
},
{
re: /^(\w{2})(\w{2})(\w{2})$/,
example: ['#00ff00', '336699'],
process: function (bits){
return [
parseInt(bits[1], 16),
parseInt(bits[2], 16),
parseInt(bits[3], 16)
];
}
},
{
re: /^(\w{1})(\w{1})(\w{1})$/,
example: ['#fb0', 'f0f'],
process: function (bits){
return [
parseInt(bits[1] + bits[1], 16),
parseInt(bits[2] + bits[2], 16),
parseInt(bits[3] + bits[3], 16)
];
}
}
];
// search through the definitions to find a match
for (var i = 0; i < color_defs.length; i++) {
var re = color_defs[i].re;
var processor = color_defs[i].process;
var bits = re.exec(colorString);
if (bits) {
var channels = processor(bits);
this.r = channels[0];
this.g = channels[1];
this.b = channels[2];
}
}
// validate/cleanup values
this.r = (this.r < 0 || isNaN(this.r)) ? 0 : ((this.r > 255) ? 255 : this.r);
this.g = (this.g < 0 || isNaN(this.g)) ? 0 : ((this.g > 255) ? 255 : this.g);
this.b = (this.b < 0 || isNaN(this.b)) ? 0 : ((this.b > 255) ? 255 : this.b);
// set up initial hsv
this.setRGB(this.r, this.g, this.b);
},
setRGB: function(r, g, b) { // null = don't change
var hsv = this.RGB_HSV(
r==null ? this.r : (this.r = r),
g==null ? this.g : (this.g = g),
b==null ? this.b : (this.b = b)
);
if (hsv[0] != null) {
this.h = hsv[0];
}
if (hsv[2] != 0) {
this.s = hsv[1];
}
this.v = hsv[2];
},
setHSV: function(h, s, v) { // null = don't change
var rgb = this.HSV_RGB(
h==null ? this.h : (this.h=h),
s==null ? this.s : (this.s=s),
v==null ? this.v : (this.v=v)
);
this.r = rgb[0];
this.g = rgb[1];
this.b = rgb[2];
},
RGB_HSV: function(r, g, b) {
var n = Math.min(Math.min(r, g), b);
var v = Math.max(Math.max(r, g), b);
var m = v - n;
if(m == 0) {
return [ null, 0, v ];
}
var h = r==n ? 3 + (b - g) / m : (g == n ? 5 + (r - b) / m : 1 + (g - r) / m);
return [ h == 6? 0: h, m / v, v ];
},
HSV_RGB: function(h, s, v) {
if (h == null) {
return [ v, v, v ];
}
var i = Math.floor(h);
var f = i % 2 ? h - i : 1 - (h - i);
var m = v * (1 - s);
var n = v * (1 - s * f);
switch(i) {
case 6:
case 0:
return [ v, n, m ];
case 1:
return [ n, v, m ];
case 2:
return [ m, v, n ];
case 3:
return [ m, n, v ];
case 4:
return [ n, m, v ];
case 5:
return [ v, m, n ];
}
},
toString: function() {
var r = Math.round(this.r).toString(16);
var g = Math.round(this.g).toString(16);
var b = Math.round(this.b).toString(16);
return (
(r.length == 1 ? '0' + r : r) +
(g.length == 1 ? '0' + g : g) +
(b.length == 1 ? '0' + b : b)
).toUpperCase();
},
toRGBArray: function() {
return [this.r, this.g, this.b];
},
toHSVArray: function() {
return [this.h, this.s, this.v];
}
}
return {Color: Color,
getRGBA: function(color, alpha) {
return 'rgba(' + color.r + ',' + color.g + ',' + color.b + ',' + alpha + ')';
}
};
});