color.class.js

/*
 * Color Class
 * Copyright 2009 Ali Farhadi (http://farhadi.ir/)
 * 
 * Released under the terms of the GNU General Public License.
 * See the GPL for details (http://www.gnu.org/licenses/gpl.html).
 */

(function(){
	this.Color = Class.extend({
		init: function(color) {
			color = Color.getRGB(color);
			if (!color) throw "Invalid Color";
			this.r = color[0];
			this.g = color[1];
			this.b = color[2];
		},
		
		toGrayscale: function() {
			var grayIntensity = Math.round(this.r * .3 + this.g * .59 + this.b * .11);
			return new Color([grayIntensity, grayIntensity, grayIntensity]);
		},
		
		toRGB: function() {
			return 'rgb(' + this.r + ', ' + this.g + ', ' + this.b + ')';
		},
		
		toHex: function() {
			var hex = (this.r * 0x10000 + this.g * 0x100 + this.b).toString(16);
			return '#' + ('00000' + hex).substr(-6);
		}
	});
	
	Color.prototype.toString = Color.prototype.toHex;
	
	// Parse strings looking for color tuples [255,255,255]
	// Code from jQuery Color Animations Plugin (http://plugins.jquery.com/project/color)
	Color.getRGB = function(color) {
		var result;

		// Check if we're already dealing with an array of colors
		if ( color && color.constructor == Array && color.length == 3 )
			return color;

		// Look for rgb(num,num,num)
		if (result = /rgb\(\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*\)/.exec(color))
			return [parseInt(result[1]), parseInt(result[2]), parseInt(result[3])];

		// Look for rgb(num%,num%,num%)
		if (result = /rgb\(\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\%\s*\)/.exec(color))
			return [parseFloat(result[1])*2.55, parseFloat(result[2])*2.55, parseFloat(result[3])*2.55];

		// Look for #a0b1c2
		if (result = /#([a-fA-F0-9]{2})([a-fA-F0-9]{2})([a-fA-F0-9]{2})/.exec(color))
			return [parseInt(result[1],16), parseInt(result[2],16), parseInt(result[3],16)];

		// Look for #fff
		if (result = /#([a-fA-F0-9])([a-fA-F0-9])([a-fA-F0-9])/.exec(color))
			return [parseInt(result[1]+result[1],16), parseInt(result[2]+result[2],16), parseInt(result[3]+result[3],16)];

		// Otherwise, we're most likely dealing with a named color
		return colors[jQuery.trim(color).toLowerCase()];
	};
	
	Color.self = function(color) {
		return new Color(color).toString();
	}

	// Some named colors to work with
	// From Interface by Stefan Petre (http://interface.eyecon.ro/)
	var colors = {
		aqua:[0,255,255],
		azure:[240,255,255],
		beige:[245,245,220],
		black:[0,0,0],
		blue:[0,0,255],
		brown:[165,42,42],
		cyan:[0,255,255],
		darkblue:[0,0,139],
		darkcyan:[0,139,139],
		darkgrey:[169,169,169],
		darkgreen:[0,100,0],
		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],
		darkviolet:[148,0,211],
		fuchsia:[255,0,255],
		gold:[255,215,0],
		green:[0,128,0],
		indigo:[75,0,130],
		khaki:[240,230,140],
		lightblue:[173,216,230],
		lightcyan:[224,255,255],
		lightgreen:[144,238,144],
		lightgrey:[211,211,211],
		lightpink:[255,182,193],
		lightyellow:[255,255,224],
		lime:[0,255,0],
		magenta:[255,0,255],
		maroon:[128,0,0],
		navy:[0,0,128],
		olive:[128,128,0],
		orange:[255,165,0],
		pink:[255,192,203],
		purple:[128,0,128],
		violet:[128,0,128],
		red:[255,0,0],
		silver:[192,192,192],
		white:[255,255,255],
		yellow:[255,255,0]
	};
	
})();