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

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

import { atan2Abs } from "@thi.ng/math/angle";
import { SQRT3, TAU, THIRD } from "@thi.ng/math/api";
import { setC3 } from "@thi.ng/vectors/setc";
import { clamp } from "../clamp.js";
const SQRT32 = SQRT3 / 2;
const rgbHsi = (out, src) => {
  out = clamp(out || src, src);
  const { 0: r, 1: g, 2: b } = out;
  const i = THIRD * (r + g + b);
  return i < 1e-6 || r === g && r === b ? setC3(out, 0, 0, i) : setC3(
    out,
    atan2Abs(SQRT32 * (g - b), 0.5 * (2 * r - g - b)) / TAU,
    1 - Math.min(r, g, b) / i,
    i
  );
};
export {
  rgbHsi
};