42 lines
960 B
TypeScript
42 lines
960 B
TypeScript
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import { RGB } from "@watsonb8/wiz-lib";
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export const colorTempToRgb = (kelvin: number): RGB => {
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var temp = kelvin / 100;
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var red, green, blue;
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if (temp <= 66) {
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red = 255;
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green = temp;
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green = 99.4708025861 * Math.log(green) - 161.1195681661;
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if (temp <= 19) {
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blue = 0;
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} else {
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blue = temp - 10;
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blue = 138.5177312231 * Math.log(blue) - 305.0447927307;
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}
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} else {
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red = temp - 60;
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red = 329.698727446 * Math.pow(red, -0.1332047592);
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green = temp - 60;
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green = 288.1221695283 * Math.pow(green, -0.0755148492);
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blue = 255;
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}
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return {
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r: clamp(red, 0, 255),
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g: clamp(green, 0, 255),
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b: clamp(blue, 0, 255),
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};
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};
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const clamp = (x: number, min: number, max: number) => {
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if (x < min) {
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return min;
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}
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if (x > max) {
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return max;
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}
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return x;
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};
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