Created
June 9, 2014 08:57
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rgba2hex.js
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| /** | |
| * Converts RGB or RGBA format to Hex format. | |
| * e.g. "rgb(28, 166, 171)" -> "#1ca6ab" | |
| * | |
| * @param rgba A color of RGB or RGBA format. | |
| * @return A color of Hex format; | |
| */ | |
| function rgba2hex(rgba) { | |
| var regex = /rgba?\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*(?:,\s*(\d+)\s*)?\)/ | |
| parsed = regex.exec(rgba), red, green, blue, alpha, elems; | |
| if (!parsed) { | |
| throw "Invalid format: " + rgba; | |
| } | |
| red = parsed[1]; | |
| green = parsed[2]; | |
| blue = parsed[3]; | |
| alpha = parsed[4]; | |
| elems = [hex(red), hex(green), hex(blue)]; | |
| if (alpha) { | |
| elems.push(hex(alpha)); | |
| } | |
| return "#" + elems.join(""); | |
| function hex(number) { | |
| if (number > 255) { | |
| throw "'" + number + "'' is greater than 255(0xff);"; | |
| } | |
| var str = Number(number).toString(16); | |
| return ("0" + str).slice(-2); | |
| } | |
| } |
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