@kcuf/mere-color/dist/cjs/util/rgb-to-hsl.js

Mere color utils for generating, manipulation, a11y purposes.

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = rgbToHsl;
function rgbToHsl(rgb) {
  var red = rgb.r / 255;
  var green = rgb.g / 255;
  var blue = rgb.b / 255;
  var max = Math.max(red, green, blue);
  var min = Math.min(red, green, blue);
  var lightness = (max + min) / 2;
  if (max === min) {
    // achromatic
    return {
      h: 0,
      s: 0,
      l: lightness * 100,
      a: rgb.a
    };
  }
  var hue;
  var delta = max - min;
  var saturation = lightness > 0.5 ? delta / (2 - max - min) : delta / (max + min);
  switch (max) {
    case red:
      hue = (green - blue) / delta + (green < blue ? 6 : 0);
      break;
    case green:
      hue = (blue - red) / delta + 2;
      break;
    default:
      // blue case
      hue = (red - green) / delta + 4;
      break;
  }
  return {
    h: hue * 60,
    s: saturation * 100,
    l: lightness * 100,
    a: rgb.a
  };
}