polished/lib/internalHelpers/_hslToRgb.js

A lightweight toolset for writing styles in Javascript.

"use strict";

exports.__esModule = true;
exports["default"] = void 0;
function colorToInt(color) {
  return Math.round(color * 255);
}
function convertToInt(red, green, blue) {
  return colorToInt(red) + "," + colorToInt(green) + "," + colorToInt(blue);
}
function hslToRgb(hue, saturation, lightness, convert) {
  if (convert === void 0) {
    convert = convertToInt;
  }
  if (saturation === 0) {
    // achromatic
    return convert(lightness, lightness, lightness);
  }

  // formulae from https://en.wikipedia.org/wiki/HSL_and_HSV
  var huePrime = (hue % 360 + 360) % 360 / 60;
  var chroma = (1 - Math.abs(2 * lightness - 1)) * saturation;
  var secondComponent = chroma * (1 - Math.abs(huePrime % 2 - 1));
  var red = 0;
  var green = 0;
  var blue = 0;
  if (huePrime >= 0 && huePrime < 1) {
    red = chroma;
    green = secondComponent;
  } else if (huePrime >= 1 && huePrime < 2) {
    red = secondComponent;
    green = chroma;
  } else if (huePrime >= 2 && huePrime < 3) {
    green = chroma;
    blue = secondComponent;
  } else if (huePrime >= 3 && huePrime < 4) {
    green = secondComponent;
    blue = chroma;
  } else if (huePrime >= 4 && huePrime < 5) {
    red = secondComponent;
    blue = chroma;
  } else if (huePrime >= 5 && huePrime < 6) {
    red = chroma;
    blue = secondComponent;
  }
  var lightnessModification = lightness - chroma / 2;
  var finalRed = red + lightnessModification;
  var finalGreen = green + lightnessModification;
  var finalBlue = blue + lightnessModification;
  return convert(finalRed, finalGreen, finalBlue);
}
var _default = exports["default"] = hslToRgb;
module.exports = exports.default;