@chayns/colors/es/converter/hsl/hslToRgb1.js

JavaScript utility functions for the calculation of colors for chayns

import { isHsl, isNumber } from '../../utils/is';
export default function hslToRgb1(hsl) {
  if (!isHsl(hsl)) {
    return null;
  }

  var h = hsl.h,
      s = hsl.s,
      l = hsl.l;
  var r;
  var g;
  var b;

  if (s === 0) {
    r = l;
    g = l;
    b = l;
  } else {
    var t1;

    if (l < 0.5) {
      t1 = l * (1 + s);
    } else {
      t1 = l + s - l * s;
    }

    var t2 = 2 * l - t1;
    var hue = h / 360;
    var tR = hue + 1 / 3;
    var tG = hue;
    var tB = hue - 1 / 3;

    var getColor = function getColor(tt) {
      var t = tt;

      if (t < 0) {
        t += 1;
      } else if (t > 1) {
        t -= 1;
      }

      if (6 * t < 1) {
        return t2 + (t1 - t2) * 6 * t;
      }

      if (2 * t < 1) {
        return t1;
      }

      if (3 * t < 2) {
        return t2 + (t1 - t2) * (2 / 3 - t) * 6;
      }

      return t2;
    };

    r = getColor(tR);
    g = getColor(tG);
    b = getColor(tB);
  }

  if ('a' in hsl && isNumber(hsl.a)) {
    return {
      r: r,
      g: g,
      b: b,
      a: hsl.a
    };
  }

  return {
    r: r,
    g: g,
    b: b
  };
}
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