@thi.ng/color/hsi/hsi-rgb.js

Array-based color types, CSS parsing, conversions, transformations, declarative theme generation, gradients, presets

import { setC3 } from "@thi.ng/vectors/setc";
import { clampH } from "../clamp.js";
const hsiRgb = (out, src) => {
  out = clampH(out || src, src);
  const s = out[1];
  const i = out[2];
  if (s < 1e-6) {
    return setC3(out, i, i, i);
  }
  const h = out[0] * 6 % 6;
  const m = i * (1 - s);
  const z = 1 - Math.abs(h % 2 - 1);
  let c = 3 * i * s / (1 + z);
  const x = c * z + m;
  c += m;
  switch (h | 0) {
    case 0:
      return setC3(out, c, x, m);
    case 1:
      return setC3(out, x, c, m);
    case 2:
      return setC3(out, m, c, x);
    case 3:
      return setC3(out, m, x, c);
    case 4:
      return setC3(out, x, m, c);
    case 5:
      return setC3(out, c, m, x);
    default:
      return setC3(out, m, m, m);
  }
};
export {
  hsiRgb
};