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21 lines
640 B
21 lines
640 B
'use strict';
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const hueToRgb = (t1, t2, hue) => {
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if (hue < 0) hue += 6;
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if (hue >= 6) hue -= 6;
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if (hue < 1) return (t2 - t1) * hue + t1;
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else if (hue < 3) return t2;
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else if (hue < 4) return (t2 - t1) * (4 - hue) + t1;
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else return t1;
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};
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// https://www.w3.org/TR/css-color-4/#hsl-to-rgb
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exports.hslToRgb = (hue, sat, light) => {
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const t2 = light <= 0.5 ? light * (sat + 1) : light + sat - light * sat;
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const t1 = light * 2 - t2;
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const r = hueToRgb(t1, t2, hue + 2);
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const g = hueToRgb(t1, t2, hue);
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const b = hueToRgb(t1, t2, hue - 2);
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return [Math.round(r * 255), Math.round(g * 255), Math.round(b * 255)];
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};
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