Created
March 16, 2016 20:09
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| var hextest = function(hex) { | |
| function hexToRgb(hex) { | |
| var result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex); | |
| return result ? { | |
| r: parseInt(result[1], 16), | |
| g: parseInt(result[2], 16), | |
| b: parseInt(result[3], 16) | |
| } : null; | |
| } | |
| function rgbToHsl(r, g, b){ | |
| r /= 255, g /= 255, b /= 255; | |
| var max = Math.max(r, g, b), min = Math.min(r, g, b); | |
| var h, s, l = (max + min) / 2; | |
| if(max == min){ | |
| h = s = 0; // achromatic | |
| }else{ | |
| var d = max - min; | |
| s = (l > 0.5) ? d / (2 - max - min) : d / (max + min); | |
| switch(max){ | |
| case r: h = (g - b) / d + (g < b ? 6 : 0); break; | |
| case g: h = (b - r) / d + 2; break; | |
| case b: h = (r - g) / d + 4; break; | |
| } | |
| h /= 6; | |
| } | |
| return {h:h, s:s, l:l}; | |
| } | |
| var returnColors = { | |
| red : "#ea4235", | |
| blue : "#4285f4", | |
| yellow : "#fbbc05", | |
| green : "#34a853" | |
| } | |
| colorshue = {} | |
| Object.keys(returnColors).forEach(function(k){ | |
| c = returnColors[k] | |
| rgb = hexToRgb(c) | |
| hsl = rgbToHsl(rgb.r, rgb.g, rgb.b) | |
| colorshue[k] = hsl.h | |
| }) | |
| rgb = hexToRgb(hex) | |
| hue = rgbToHsl(rgb.r, rgb.g, rgb.b).h | |
| // hack for values of purple->red | |
| if (hue > 0.77) { | |
| return returnColors.red; | |
| } | |
| smallest_difference = 100000 | |
| smallest_key = "" | |
| Object.keys(colorshue).forEach(function(k){ | |
| v = Math.abs(hue - colorshue[k]) | |
| if (v < smallest_difference) { | |
| smallest_key = k | |
| smallest_difference = v | |
| } | |
| }) | |
| return returnColors[smallest_key] | |
| } | |
| testcolor = "#ffe433" | |
| returncolor = hextest(testcolor) | |
| console.log("input", testcolor, "output", returncolor) |
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