@macrostrat/column-components/dist/chroma-js/src/io/hcg/rgb2hcg.js

React rendering primitives for stratigraphic columns

import { min, max } from "../../utils/index.js";
import unpack from "../../utils/unpack.js";
const rgb2hcg = (...args) => {
  const [r, g, b] = unpack(args, "rgb");
  const minRgb = min(r, g, b);
  const maxRgb = max(r, g, b);
  const delta = maxRgb - minRgb;
  const c = delta * 100 / 255;
  const _g = minRgb / (255 - delta) * 100;
  let h;
  if (delta === 0) {
    h = Number.NaN;
  } else {
    if (r === maxRgb) h = (g - b) / delta;
    if (g === maxRgb) h = 2 + (b - r) / delta;
    if (b === maxRgb) h = 4 + (r - g) / delta;
    h *= 60;
    if (h < 0) h += 360;
  }
  return [h, c, _g];
};
export {
  rgb2hcg as default
};
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