@chayns/colors/es/converter/hsl/rgb1ToHsl.js

JavaScript utility functions for the calculation of colors for chayns

import { isNumber, isRgb1 } from '../../utils/is';
export default function rgb1ToHsl(rgb) {
  if (!isRgb1(rgb)) {
    return null;
  }

  var r = rgb.r,
      g = rgb.g,
      b = rgb.b;
  var max = Math.max(r, g, b);
  var min = Math.min(r, g, b);
  var h = 0;

  if (max === min) {
    h = 0;
  } else if (max === r) {
    h = 60 * ((g - b) / (max - min));
  } else if (max === g) {
    h = 60 * (2 + (b - r) / (max - min));
  } else if (max === b) {
    h = 60 * (4 + (r - g) / (max - min));
  }

  if (h < 0) {
    h += 360;
  }

  var s;

  if (max === 0 || min === 1) {
    s = 0;
  } else {
    s = (max - min) / (1 - Math.abs(max + min - 1));
  }

  var l = (max + min) / 2;

  if ('a' in rgb && isNumber(rgb.a)) {
    return {
      h: h,
      s: s,
      l: l,
      a: rgb.a
    };
  }

  return {
    h: h,
    s: s,
    l: l
  };
}
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