180 lines
6 KiB
JavaScript
180 lines
6 KiB
JavaScript
/* Plugin for jQuery for working with colors.
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*
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* Version 1.1.
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*
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* Inspiration from jQuery color animation plugin by John Resig.
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*
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* Released under the MIT license by Ole Laursen, October 2009.
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*
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* Examples:
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*
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* $.color.parse("#fff").scale('rgb', 0.25).add('a', -0.5).toString()
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* var c = $.color.extract($("#mydiv"), 'background-color');
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* console.log(c.r, c.g, c.b, c.a);
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* $.color.make(100, 50, 25, 0.4).toString() // returns "rgba(100,50,25,0.4)"
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*
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* Note that .scale() and .add() return the same modified object
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* instead of making a new one.
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*
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* V. 1.1: Fix error handling so e.g. parsing an empty string does
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* produce a color rather than just crashing.
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*/
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(function($) {
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$.color = {};
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// construct color object with some convenient chainable helpers
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$.color.make = function (r, g, b, a) {
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var o = {};
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o.r = r || 0;
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o.g = g || 0;
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o.b = b || 0;
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o.a = a != null ? a : 1;
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o.add = function (c, d) {
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for (var i = 0; i < c.length; ++i)
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o[c.charAt(i)] += d;
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return o.normalize();
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};
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o.scale = function (c, f) {
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for (var i = 0; i < c.length; ++i)
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o[c.charAt(i)] *= f;
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return o.normalize();
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};
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o.toString = function () {
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if (o.a >= 1.0) {
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return "rgb("+[o.r, o.g, o.b].join(",")+")";
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} else {
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return "rgba("+[o.r, o.g, o.b, o.a].join(",")+")";
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}
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};
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o.normalize = function () {
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function clamp(min, value, max) {
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return value < min ? min: (value > max ? max: value);
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}
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o.r = clamp(0, parseInt(o.r), 255);
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o.g = clamp(0, parseInt(o.g), 255);
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o.b = clamp(0, parseInt(o.b), 255);
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o.a = clamp(0, o.a, 1);
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return o;
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};
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o.clone = function () {
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return $.color.make(o.r, o.b, o.g, o.a);
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};
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return o.normalize();
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}
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// extract CSS color property from element, going up in the DOM
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// if it's "transparent"
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$.color.extract = function (elem, css) {
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var c;
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do {
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c = elem.css(css).toLowerCase();
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// keep going until we find an element that has color, or
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// we hit the body or root (have no parent)
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if (c != '' && c != 'transparent')
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break;
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elem = elem.parent();
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} while (elem.length && !$.nodeName(elem.get(0), "body"));
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// catch Safari's way of signalling transparent
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if (c == "rgba(0, 0, 0, 0)")
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c = "transparent";
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return $.color.parse(c);
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}
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// parse CSS color string (like "rgb(10, 32, 43)" or "#fff"),
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// returns color object, if parsing failed, you get black (0, 0,
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// 0) out
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$.color.parse = function (str) {
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var res, m = $.color.make;
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// Look for rgb(num,num,num)
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if (res = /rgb\(\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*\)/.exec(str))
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return m(parseInt(res[1], 10), parseInt(res[2], 10), parseInt(res[3], 10));
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// Look for rgba(num,num,num,num)
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if (res = /rgba\(\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*,\s*([0-9]+(?:\.[0-9]+)?)\s*\)/.exec(str))
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return m(parseInt(res[1], 10), parseInt(res[2], 10), parseInt(res[3], 10), parseFloat(res[4]));
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// Look for rgb(num%,num%,num%)
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if (res = /rgb\(\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\%\s*\)/.exec(str))
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return m(parseFloat(res[1])*2.55, parseFloat(res[2])*2.55, parseFloat(res[3])*2.55);
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// Look for rgba(num%,num%,num%,num)
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if (res = /rgba\(\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\s*\)/.exec(str))
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return m(parseFloat(res[1])*2.55, parseFloat(res[2])*2.55, parseFloat(res[3])*2.55, parseFloat(res[4]));
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// Look for #a0b1c2
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if (res = /#([a-fA-F0-9]{2})([a-fA-F0-9]{2})([a-fA-F0-9]{2})/.exec(str))
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return m(parseInt(res[1], 16), parseInt(res[2], 16), parseInt(res[3], 16));
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// Look for #fff
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if (res = /#([a-fA-F0-9])([a-fA-F0-9])([a-fA-F0-9])/.exec(str))
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return m(parseInt(res[1]+res[1], 16), parseInt(res[2]+res[2], 16), parseInt(res[3]+res[3], 16));
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// Otherwise, we're most likely dealing with a named color
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var name = $.trim(str).toLowerCase();
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if (name == "transparent")
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return m(255, 255, 255, 0);
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else {
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// default to black
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res = lookupColors[name] || [0, 0, 0];
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return m(res[0], res[1], res[2]);
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}
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}
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var lookupColors = {
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aqua:[0,255,255],
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azure:[240,255,255],
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beige:[245,245,220],
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black:[0,0,0],
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blue:[0,0,255],
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brown:[165,42,42],
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cyan:[0,255,255],
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darkblue:[0,0,139],
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darkcyan:[0,139,139],
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darkgrey:[169,169,169],
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darkgreen:[0,100,0],
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darkkhaki:[189,183,107],
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darkmagenta:[139,0,139],
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darkolivegreen:[85,107,47],
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darkorange:[255,140,0],
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darkorchid:[153,50,204],
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darkred:[139,0,0],
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darksalmon:[233,150,122],
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darkviolet:[148,0,211],
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fuchsia:[255,0,255],
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gold:[255,215,0],
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green:[0,128,0],
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indigo:[75,0,130],
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khaki:[240,230,140],
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lightblue:[173,216,230],
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lightcyan:[224,255,255],
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lightgreen:[144,238,144],
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lightgrey:[211,211,211],
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lightpink:[255,182,193],
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lightyellow:[255,255,224],
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lime:[0,255,0],
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magenta:[255,0,255],
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maroon:[128,0,0],
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navy:[0,0,128],
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olive:[128,128,0],
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orange:[255,165,0],
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pink:[255,192,203],
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purple:[128,0,128],
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violet:[128,0,128],
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red:[255,0,0],
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silver:[192,192,192],
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white:[255,255,255],
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yellow:[255,255,0]
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};
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})(jQuery);
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