JavaScript - convert HSV color to RGB color

// Converts HSV color to RGB.

// Arguments:

//   hue         from 0 to 360 degree

//   saturation  from 0 to 1

//   value       from 0 to 1

// Returns: RGB color (components from 0 to 1)

//

const toRgb = (hue, saturation, value) => {

    let d = 0.0166666666666666 * hue;

    let c = value * saturation;

    let x = c - c * Math.abs(d % 2.0 - 1.0);

    let m = value - c;

    c += m;

    x += m;

    switch (d >>> 0) {

        case 0: return {red: c, green: x, blue: m};

        case 1: return {red: x, green: c, blue: m};

        case 2: return {red: m, green: c, blue: x};

        case 3: return {red: m, green: x, blue: c};

        case 4: return {red: x, green: m, blue: c};

    }

    return {red: c, green: m, blue: x};

};

​

​

// Usage example:

​

const rgb = toRgb(200, 0.5, 0.5);  // 200deg, 50%, 50%

​

console.log(`red:   ${Math.round(255 * rgb.red  )}`);  // 64

console.log(`green: ${Math.round(255 * rgb.green)}`);  // 106

console.log(`blue:  ${Math.round(255 * rgb.blue )}`);  // 128