| 提交 | 用户 | 时间 | ||
| 58d006 | 1 | /* Plugin for jQuery for working with colors. |
| A | 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); | |
