https://www.morinfrance.com/javascripts/nyro/jquery.color.js

1/*
2 * jQuery Color Animations
3 * Copyright 2007 John Resig
4 * Released under the MIT and GPL licenses.
5 */
6(function(jQuery){
7
8	// We override the animation for all of these color styles
9	jQuery.each(['backgroundColor', 'borderBottomColor', 'borderLeftColor', 'borderRightColor', 'borderTopColor', 'color', 'outlineColor'], function(i,attr){
10		jQuery.fx.step[attr] = function(fx){
11			if ( fx.state == 0 ) {
12				fx.start = getColor( fx.elem, attr );
13				fx.end = getRGB( fx.end );
14			}
15
16			fx.elem.style[attr] = "rgb(" + [
17				Math.max(Math.min( parseInt((fx.pos * (fx.end[0] - fx.start[0])) + fx.start[0]), 255), 0),
18				Math.max(Math.min( parseInt((fx.pos * (fx.end[1] - fx.start[1])) + fx.start[1]), 255), 0),
19				Math.max(Math.min( parseInt((fx.pos * (fx.end[2] - fx.start[2])) + fx.start[2]), 255), 0)
20			].join(",") + ")";
21		}
22	});
23
24	// Color Conversion functions from highlightFade
25	// By Blair Mitchelmore
26	// http://jquery.offput.ca/highlightFade/
27
28	// Parse strings looking for color tuples [255,255,255]
29	function getRGB(color) {
30		var result;
31
32		// Check if we're already dealing with an array of colors
33		if ( color && color.constructor == Array && color.length == 3 )
34			return color;
35
36		// Look for rgb(num,num,num)
37		if (result = /rgb\(\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*\)/.exec(color))
38			return [parseInt(result[1]), parseInt(result[2]), parseInt(result[3])];
39
40		// Look for rgb(num%,num%,num%)
41		if (result = /rgb\(\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\%\s*\)/.exec(color))
42			return [parseFloat(result[1])*2.55, parseFloat(result[2])*2.55, parseFloat(result[3])*2.55];
43
44		// Look for #a0b1c2
45		if (result = /#([a-fA-F0-9]{2})([a-fA-F0-9]{2})([a-fA-F0-9]{2})/.exec(color))
46			return [parseInt(result[1],16), parseInt(result[2],16), parseInt(result[3],16)];
47
48		// Look for #fff
49		if (result = /#([a-fA-F0-9])([a-fA-F0-9])([a-fA-F0-9])/.exec(color))
50			return [parseInt(result[1]+result[1],16), parseInt(result[2]+result[2],16), parseInt(result[3]+result[3],16)];
51
52		// Otherwise, we're most likely dealing with a named color
53		return colors[jQuery.trim(color).toLowerCase()];
54	}
55	
56	function getColor(elem, attr) {
57		var color;
58
59		do {
60			color = jQuery.curCSS(elem, attr);
61
62			// Keep going until we find an element that has color, or we hit the body
63			if ( color != '' && color != 'transparent' || jQuery.nodeName(elem, "body") )
64				break; 
65
66			attr = "backgroundColor";
67		} while ( elem = elem.parentNode );
68
69		return getRGB(color);
70	};
71	
72	// Some named colors to work with
73	// From Interface by Stefan Petre
74	// http://interface.eyecon.ro/
75
76	var colors = {
77		aqua:[0,255,255],
78		azure:[240,255,255],
79		beige:[245,245,220],
80		black:[0,0,0],
81		blue:[0,0,255],
82		brown:[165,42,42],
83		cyan:[0,255,255],
84		darkblue:[0,0,139],
85		darkcyan:[0,139,139],
86		darkgrey:[169,169,169],
87		darkgreen:[0,100,0],
88		darkkhaki:[189,183,107],
89		darkmagenta:[139,0,139],
90		darkolivegreen:[85,107,47],
91		darkorange:[255,140,0],
92		darkorchid:[153,50,204],
93		darkred:[139,0,0],
94		darksalmon:[233,150,122],
95		darkviolet:[148,0,211],
96		fuchsia:[255,0,255],
97		gold:[255,215,0],
98		green:[0,128,0],
99		indigo:[75,0,130],
100		khaki:[240,230,140],
101		lightblue:[173,216,230],
102		lightcyan:[224,255,255],
103		lightgreen:[144,238,144],
104		lightgrey:[211,211,211],
105		lightpink:[255,182,193],
106		lightyellow:[255,255,224],
107		lime:[0,255,0],
108		magenta:[255,0,255],
109		maroon:[128,0,0],
110		navy:[0,0,128],
111		olive:[128,128,0],
112		orange:[255,165,0],
113		pink:[255,192,203],
114		purple:[128,0,128],
115		violet:[128,0,128],
116		red:[255,0,0],
117		silver:[192,192,192],
118		white:[255,255,255],
119		yellow:[255,255,0]
120	};
121	
122})(jQuery);