@macrostrat/column-components/dist/chroma-js/src/io/hsi/hsi2rgb.js

React rendering primitives for stratigraphic columns

import { TWOPI, PITHIRD } from "../../utils/index.js";
import unpack from "../../utils/unpack.js";
import limit from "../../utils/limit.js";
const { cos } = Math;
const hsi2rgb = (...args) => {
  args = unpack(args, "hsi");
  let [h, s, i] = args;
  let r, g, b;
  if (isNaN(h)) h = 0;
  if (isNaN(s)) s = 0;
  if (h > 360) h -= 360;
  if (h < 0) h += 360;
  h /= 360;
  if (h < 1 / 3) {
    b = (1 - s) / 3;
    r = (1 + s * cos(TWOPI * h) / cos(PITHIRD - TWOPI * h)) / 3;
    g = 1 - (b + r);
  } else if (h < 2 / 3) {
    h -= 1 / 3;
    r = (1 - s) / 3;
    g = (1 + s * cos(TWOPI * h) / cos(PITHIRD - TWOPI * h)) / 3;
    b = 1 - (r + g);
  } else {
    h -= 2 / 3;
    g = (1 - s) / 3;
    b = (1 + s * cos(TWOPI * h) / cos(PITHIRD - TWOPI * h)) / 3;
    r = 1 - (g + b);
  }
  r = limit(i * r * 3);
  g = limit(i * g * 3);
  b = limit(i * b * 3);
  return [r * 255, g * 255, b * 255, args.length > 3 ? args[3] : 1];
};
export {
  hsi2rgb as default
};
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