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/* 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 |
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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 (!$.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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