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38 lines
857 B
38 lines
857 B
2 years ago
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exports = function(rgb) {
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var r = rgb[0] / 255;
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var g = rgb[1] / 255;
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var b = rgb[2] / 255;
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var min = mMin(r, g, b);
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var max = mMax(r, g, b);
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var delta = max - min;
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var h;
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var s;
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if (max === min) {
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h = 0;
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} else if (r === max) {
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h = (g - b) / delta;
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} else if (g === max) {
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h = 2 + (b - r) / delta;
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} else {
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h = 4 + (r - g) / delta;
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}
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h = mMin(h * 60, 360);
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if (h < 0) h += 360;
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var l = (min + max) / 2;
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if (max === min) {
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s = 0;
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} else if (l <= 0.5) {
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s = delta / (max + min);
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} else {
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s = delta / (2 - max - min);
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}
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var ret = [round(h), round(s * 100), round(l * 100)];
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if (rgb[3]) ret[3] = rgb[3];
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return ret;
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};
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var mMin = Math.min;
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var mMax = Math.max;
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var round = Math.round;
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module.exports = exports;
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