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40 lines
917 B
40 lines
917 B
exports = function(hsl) {
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var h = hsl[0] / 360;
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var s = hsl[1] / 100;
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var l = hsl[2] / 100;
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var ret = [];
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var t2;
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var t3;
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var val;
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if (hsl[3]) ret[3] = hsl[3];
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if (s === 0) {
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val = round(l * 255);
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ret[0] = ret[1] = ret[2] = val;
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return ret;
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}
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if (l < 0.5) {
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t2 = l * (1 + s);
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} else {
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t2 = l + s - l * s;
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}
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var t1 = 2 * l - t2;
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for (var i = 0; i < 3; i++) {
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t3 = h + (1 / 3) * -(i - 1);
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if (t3 < 0) t3++;
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if (t3 > 1) t3--;
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if (6 * t3 < 1) {
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val = t1 + (t2 - t1) * 6 * t3;
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} else if (2 * t3 < 1) {
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val = t2;
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} else if (3 * t3 < 2) {
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val = t1 + (t2 - t1) * (2 / 3 - t3) * 6;
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} else {
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val = t1;
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}
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ret[i] = round(val * 255);
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}
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return ret;
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};
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var round = Math.round;
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module.exports = exports;
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