chroma-js/src/io/hsv/hsv2rgb.js

JavaScript library for color conversions

import { unpack } from '../../utils/index.js';
const { floor } = Math;

const hsv2rgb = (...args) => {
    args = unpack(args, 'hsv');
    let [h, s, v] = args;
    let r, g, b;
    v *= 255;
    if (s === 0) {
        r = g = b = v;
    } else {
        if (h === 360) h = 0;
        if (h > 360) h -= 360;
        if (h < 0) h += 360;
        h /= 60;

        const i = floor(h);
        const f = h - i;
        const p = v * (1 - s);
        const q = v * (1 - s * f);
        const t = v * (1 - s * (1 - f));

        switch (i) {
            case 0:
                [r, g, b] = [v, t, p];
                break;
            case 1:
                [r, g, b] = [q, v, p];
                break;
            case 2:
                [r, g, b] = [p, v, t];
                break;
            case 3:
                [r, g, b] = [p, q, v];
                break;
            case 4:
                [r, g, b] = [t, p, v];
                break;
            case 5:
                [r, g, b] = [v, p, q];
                break;
        }
    }
    return [r, g, b, args.length > 3 ? args[3] : 1];
};

export default hsv2rgb;