}); /* hexToComplimentary : Converts hex value to HSL, shifts * hue by 180 degrees and then converts hex, giving complimentary color * as a hex value * @param [String] hex : hex value * @return [String] : complimentary color as hex value */ function hexToComplimentary(hex){ // Convert hex to rgb // Credit to Denis http://stackoverflow.com/a/36253499/4939630 var rgb = 'rgb(' + (hex = hex.replace('#', '')).match(new RegExp('(.{' + hex.length/3 + '})', 'g')).map(function(l) { return parseInt(hex.length%2 ? l+l : l, 16); }).join(',') + ')'; // Get array of RGB values rgb = rgb.replace(/[^\d,]/g, '').split(','); var r = rgb[0], g = rgb[1], b = rgb[2]; // Convert RGB to HSL // Adapted from answer by 0x000f http://stackoverflow.com/a/34946092/4939630 r /= 255.0; g /= 255.0; b /= 255.0; var max = Math.max(r, g, b); var min = Math.min(r, g, b); var h, s, l = (max + min) / 2.0; if(max == min) { h = s = 0; //achromatic } else { var d = max - min; s = (l > 0.5 ? d / (2.0 - max - min) : d / (max + min)); if(max == r && g >= b) { h = 1.0472 * (g - b) / d ; } else if(max == r && g < b) { h = 1.0472 * (g - b) / d + 6.2832; } else if(max == g) { h = 1.0472 * (b - r) / d + 2.0944; } else if(max == b) {
h = 1.0472 * (r - g) / d + 4.1888; } } h = h / 6.2832 * 360.0 + 0; // Shift hue to opposite side of wheel and convert to [0-1] value h+= 180; if (h > 360) { h -= 360; } h /= 360; // Convert h s and l values into r g and b values // Adapted from answer by Mohsen http://stackoverflow.com/a/9493060/4939630 if(s === 0){ r = g = b = l; // achromatic } else { var hue2rgb = function hue2rgb(p, q, t){ if(t < 0) t += 1; if(t > 1) t -= 1; if(t < 1/6) return p + (q - p) * 6 * t; if(t < 1/2) return q; if(t < 2/3) return p + (q - p) * (2/3 - t) * 6; return p; }; var q = l < 0.5 ? l * (1 + s) : l + s - l * s; var p = 2 * l - q; r = hue2rgb(p, q, h + 1/3); g = hue2rgb(p, q, h); b = hue2rgb(p, q, h - 1/3); } r = Math.round(r * 255); g = Math.round(g * 255); b = Math.round(b * 255); // Convert r b and g values to hex rgb = b | (g << 8) | (r << 16); return "#" + (0x1000000 | rgb).toString(16).substring(1); }
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