convertHsvToRgb.js•895 B
import normalizeHue from '../util/normalizeHue.js';
// Based on: https://en.wikipedia.org/wiki/HSL_and_HSV#Converting_to_RGB
export default function convertHsvToRgb({ h, s, v, alpha }) {
h = normalizeHue(h);
let f = Math.abs(((h / 60) % 2) - 1);
let res;
switch (Math.floor(h / 60)) {
case 0:
res = { r: v, g: v * (1 - s * f), b: v * (1 - s) };
break;
case 1:
res = { r: v * (1 - s * f), g: v, b: v * (1 - s) };
break;
case 2:
res = { r: v * (1 - s), g: v, b: v * (1 - s * f) };
break;
case 3:
res = { r: v * (1 - s), g: v * (1 - s * f), b: v };
break;
case 4:
res = { r: v * (1 - s * f), g: v * (1 - s), b: v };
break;
case 5:
res = { r: v, g: v * (1 - s), b: v * (1 - s * f) };
break;
default:
res = { r: v * (1 - s), g: v * (1 - s), b: v * (1 - s) };
}
res.mode = 'rgb';
if (alpha !== undefined) res.alpha = alpha;
return res;
}