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