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jquery.colorhelpers.js
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jquery.colorhelpers.js
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/* Plugin for jQuery for working with colors.
*
* Version 1.1.
*
* Inspiration from jQuery color animation plugin by John Resig.
*
* Released under the MIT license by Ole Laursen, October 2009.
*
* Examples:
*
* $.color.parse("#fff").scale('rgb', 0.25).add('a', -0.5).toString()
* var c = $.color.extract($("#mydiv"), 'background-color');
* console.log(c.r, c.g, c.b, c.a);
* $.color.make(100, 50, 25, 0.4).toString() // returns "rgba(100,50,25,0.4)"
*
* Note that .scale() and .add() return the same modified object
* instead of making a new one.
*
* V. 1.1: Fix error handling so e.g. parsing an empty string does
* produce a color rather than just crashing.
*/
(function($) {
$.color = {};
// construct color object with some convenient chainable helpers
$.color.make = function (r, g, b, a) {
var o = {};
o.r = r || 0;
o.g = g || 0;
o.b = b || 0;
o.a = a != null ? a : 1;
o.add = function (c, d) {
for (var i = 0; i < c.length; ++i)
o[c.charAt(i)] += d;
return o.normalize();
};
o.scale = function (c, f) {
for (var i = 0; i < c.length; ++i)
o[c.charAt(i)] *= f;
return o.normalize();
};
o.toString = function () {
if (o.a >= 1.0) {
return "rgb("+[o.r, o.g, o.b].join(",")+")";
} else {
return "rgba("+[o.r, o.g, o.b, o.a].join(",")+")";
}
};
o.normalize = function () {
function clamp(min, value, max) {
return value < min ? min: (value > max ? max: value);
}
o.r = clamp(0, parseInt(o.r), 255);
o.g = clamp(0, parseInt(o.g), 255);
o.b = clamp(0, parseInt(o.b), 255);
o.a = clamp(0, o.a, 1);
return o;
};
o.clone = function () {
return $.color.make(o.r, o.b, o.g, o.a);
};
return o.normalize();
}
// extract CSS color property from element, going up in the DOM
// if it's "transparent"
$.color.extract = function (elem, css) {
var c;
do {
c = elem.css(css).toLowerCase();
// keep going until we find an element that has color, or
// we hit the body or root (have no parent)
if (c != '' && c != 'transparent')
break;
elem = elem.parent();
} while (elem.length && !$.nodeName(elem.get(0), "body"));
// catch Safari's way of signalling transparent
if (c == "rgba(0, 0, 0, 0)")
c = "transparent";
return $.color.parse(c);
}
// parse CSS color string (like "rgb(10, 32, 43)" or "#fff"),
// returns color object, if parsing failed, you get black (0, 0,
// 0) out
$.color.parse = function (str) {
var res, m = $.color.make;
// Look for rgb(num,num,num)
if (res = /rgb\(\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*\)/.exec(str))
return m(parseInt(res[1], 10), parseInt(res[2], 10), parseInt(res[3], 10));
// Look for rgba(num,num,num,num)
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))
return m(parseInt(res[1], 10), parseInt(res[2], 10), parseInt(res[3], 10), parseFloat(res[4]));
// Look for rgb(num%,num%,num%)
if (res = /rgb\(\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\%\s*\)/.exec(str))
return m(parseFloat(res[1])*2.55, parseFloat(res[2])*2.55, parseFloat(res[3])*2.55);
// Look for rgba(num%,num%,num%,num)
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))
return m(parseFloat(res[1])*2.55, parseFloat(res[2])*2.55, parseFloat(res[3])*2.55, parseFloat(res[4]));
// Look for #a0b1c2
if (res = /#([a-fA-F0-9]{2})([a-fA-F0-9]{2})([a-fA-F0-9]{2})/.exec(str))
return m(parseInt(res[1], 16), parseInt(res[2], 16), parseInt(res[3], 16));
// Look for #fff
if (res = /#([a-fA-F0-9])([a-fA-F0-9])([a-fA-F0-9])/.exec(str))
return m(parseInt(res[1]+res[1], 16), parseInt(res[2]+res[2], 16), parseInt(res[3]+res[3], 16));
// Otherwise, we're most likely dealing with a named color
var name = $.trim(str).toLowerCase();
if (name == "transparent")
return m(255, 255, 255, 0);
else {
// default to black
res = lookupColors[name] || [0, 0, 0];
return m(res[0], res[1], res[2]);
}
}
var lookupColors = {
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]
};
})(jQuery);