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https://hearthis.at/_/javascripts/jquery.colorhelpers.js

js hearthis.at collected 2026-10-01 08:29:45 UTC 6,109 bytes, 179 lines download raw bytes

vendor: 6,109 bytes, lines 1-179
1/* Plugin for jQuery for working with colors.
2 * 
3 * Version 1.1.
4 * 
5 * Inspiration from jQuery color animation plugin by John Resig.
6 *
7 * Released under the MIT license by Ole Laursen, October 2009.
8 *
9 * Examples:
10 *
11 *   $.color.parse("#fff").scale('rgb', 0.25).add('a', -0.5).toString()
12 *   var c = $.color.extract($("#mydiv"), 'background-color');
13 *   console.log(c.r, c.g, c.b, c.a);
14 *   $.color.make(100, 50, 25, 0.4).toString() // returns "rgba(100,50,25,0.4)"
15 *
16 * Note that .scale() and .add() return the same modified object
17 * instead of making a new one.
18 *
19 * V. 1.1: Fix error handling so e.g. parsing an empty string does
20 * produce a color rather than just crashing.
21 */ 
22
23(function($) {
24    $.color = {};
25
26    // construct color object with some convenient chainable helpers
27    $.color.make = function (r, g, b, a) {
28        var o = {};
29        o.r = r || 0;
30        o.g = g || 0;
31        o.b = b || 0;
32        o.a = a != null ? a : 1;
33
34        o.add = function (c, d) {
35            for (var i = 0; i < c.length; ++i)
36                o[c.charAt(i)] += d;
37            return o.normalize();
38        };
39        
40        o.scale = function (c, f) {
41            for (var i = 0; i < c.length; ++i)
42                o[c.charAt(i)] *= f;
43            return o.normalize();
44        };
45        
46        o.toString = function () {
47            if (o.a >= 1.0) {
48                return "rgb("+[o.r, o.g, o.b].join(",")+")";
49            } else {
50                return "rgba("+[o.r, o.g, o.b, o.a].join(",")+")";
51            }
52        };
53
54        o.normalize = function () {
55            function clamp(min, value, max) {
56                return value < min ? min: (value > max ? max: value);
57            }
58            
59            o.r = clamp(0, parseInt(o.r), 255);
60            o.g = clamp(0, parseInt(o.g), 255);
61            o.b = clamp(0, parseInt(o.b), 255);
62            o.a = clamp(0, o.a, 1);
63            return o;
64        };
65
66        o.clone = function () {
67            return $.color.make(o.r, o.b, o.g, o.a);
68        };
69
70        return o.normalize();
71    }
72
73    // extract CSS color property from element, going up in the DOM
74    // if it's "transparent"
75    $.color.extract = function (elem, css) {
76        var c;
77        do {
78            c = elem.css(css).toLowerCase();
79            // keep going until we find an element that has color, or
80            // we hit the body
81            if (c != '' && c != 'transparent')
82                break;
83            elem = elem.parent();
84        } while (!$.nodeName(elem.get(0), "body"));
85
86        // catch Safari's way of signalling transparent
87        if (c == "rgba(0, 0, 0, 0)")
88            c = "transparent";
89        
90        return $.color.parse(c);
91    }
92    
93    // parse CSS color string (like "rgb(10, 32, 43)" or "#fff"),
94    // returns color object, if parsing failed, you get black (0, 0,
95    // 0) out
96    $.color.parse = function (str) {
97        var res, m = $.color.make;
98
99        // Look for rgb(num,num,num)
100        if (res = /rgb\(\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*\)/.exec(str))
101            return m(parseInt(res[1], 10), parseInt(res[2], 10), parseInt(res[3], 10));
102        
103        // Look for rgba(num,num,num,num)
104        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))
105            return m(parseInt(res[1], 10), parseInt(res[2], 10), parseInt(res[3], 10), parseFloat(res[4]));
106            
107        // Look for rgb(num%,num%,num%)
108        if (res = /rgb\(\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\%\s*\)/.exec(str))
109            return m(parseFloat(res[1])*2.55, parseFloat(res[2])*2.55, parseFloat(res[3])*2.55);
110
111        // Look for rgba(num%,num%,num%,num)
112        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))
113            return m(parseFloat(res[1])*2.55, parseFloat(res[2])*2.55, parseFloat(res[3])*2.55, parseFloat(res[4]));
114        
115        // Look for #a0b1c2
116        if (res = /#([a-fA-F0-9]{2})([a-fA-F0-9]{2})([a-fA-F0-9]{2})/.exec(str))
117            return m(parseInt(res[1], 16), parseInt(res[2], 16), parseInt(res[3], 16));
118
119        // Look for #fff
120        if (res = /#([a-fA-F0-9])([a-fA-F0-9])([a-fA-F0-9])/.exec(str))
121            return m(parseInt(res[1]+res[1], 16), parseInt(res[2]+res[2], 16), parseInt(res[3]+res[3], 16));
122
123        // Otherwise, we're most likely dealing with a named color
124        var name = $.trim(str).toLowerCase();
125        if (name == "transparent")
126            return m(255, 255, 255, 0);
127        else {
128            // default to black
129            res = lookupColors[name] || [0, 0, 0];
130            return m(res[0], res[1], res[2]);
131        }
132    }
133    
134    var lookupColors = {
135        aqua:[0,255,255],
136        azure:[240,255,255],
137        beige:[245,245,220],
138        black:[0,0,0],
139        blue:[0,0,255],
140        brown:[165,42,42],
141        cyan:[0,255,255],
142        darkblue:[0,0,139],
143        darkcyan:[0,139,139],
144        darkgrey:[169,169,169],
145        darkgreen:[0,100,0],
146        darkkhaki:[189,183,107],
147        darkmagenta:[139,0,139],
148        darkolivegreen:[85,107,47],
149        darkorange:[255,140,0],
150        darkorchid:[153,50,204],
151        darkred:[139,0,0],
152        darksalmon:[233,150,122],
153        darkviolet:[148,0,211],
154        fuchsia:[255,0,255],
155        gold:[255,215,0],
156        green:[0,128,0],
157        indigo:[75,0,130],
158        khaki:[240,230,140],
159        lightblue:[173,216,230],
160        lightcyan:[224,255,255],
161        lightgreen:[144,238,144],
162        lightgrey:[211,211,211],
163        lightpink:[255,182,193],
164        lightyellow:[255,255,224],
165        lime:[0,255,0],
166        magenta:[255,0,255],
167        maroon:[128,0,0],
168        navy:[0,0,128],
169        olive:[128,128,0],
170        orange:[255,165,0],
171        pink:[255,192,203],
172        purple:[128,0,128],
173        violet:[128,0,128],
174        red:[255,0,0],
175        silver:[192,192,192],
176        white:[255,255,255],
177        yellow:[255,255,0]
178    };
179})(jQuery);

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