lifxlan
Version:
TypeScript library for controlling LIFX products over LAN
75 lines • 1.77 kB
JavaScript
/**
* Converts HSB values to RGB values.
*
* @param h Hue [0-65535]
* @param s Saturation [0-65535]
* @param b Brightness [0-65535]
* @returns RGB values [0-255]
*/
export function hsbToRgb(h, s, b) {
h = (h * 6) / 65535;
s = s / 65535;
b = b * 255 / 65535;
const i = Math.floor(h);
const f = h - i;
const p = b * (1 - s);
const q = b * (1 - s * f);
const t = b * (1 - s * (1 - f));
let r, g, bl;
switch (i) {
case 0:
r = b;
g = t;
bl = p;
break;
case 1:
r = q;
g = b;
bl = p;
break;
case 2:
r = p;
g = b;
bl = t;
break;
case 3:
r = p;
g = q;
bl = b;
break;
case 4:
r = t;
g = p;
bl = b;
break;
default:
r = b;
g = p;
bl = q;
}
return [Math.round(r), Math.round(g), Math.round(bl)];
}
/**
* Converts RGB values to HSB values.
*
* https://github.com/Chalarangelo/30-seconds-of-code/blob/master/content/snippets/js/s/rgb-to-hsb.md
*
* @param r Red [0-255]
* @param g Green [0-255]
* @param b Blue [0-255]
* @returns HSB values [0-65535]
*/
export function rgbToHsb(r, g, b) {
r /= 255;
g /= 255;
b /= 255;
const v = Math.max(r, g, b);
const n = v - Math.min(r, g, b);
const h = n === 0 ? 0 : n && v === r ? (g - b) / n : v === g ? 2 + (b - r) / n : 4 + (r - g) / n;
return [
Math.round((60 * (h < 0 ? h + 6 : h)) * (65535 / 360)),
Math.round(v && (n / v) * 65535),
Math.round(v * 65535),
];
}
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