_hslToRgb.js 1.6 KB

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  1. "use strict";
  2. exports.__esModule = true;
  3. exports["default"] = void 0;
  4. function colorToInt(color) {
  5. return Math.round(color * 255);
  6. }
  7. function convertToInt(red, green, blue) {
  8. return colorToInt(red) + "," + colorToInt(green) + "," + colorToInt(blue);
  9. }
  10. function hslToRgb(hue, saturation, lightness, convert) {
  11. if (convert === void 0) {
  12. convert = convertToInt;
  13. }
  14. if (saturation === 0) {
  15. // achromatic
  16. return convert(lightness, lightness, lightness);
  17. }
  18. // formulae from https://en.wikipedia.org/wiki/HSL_and_HSV
  19. var huePrime = (hue % 360 + 360) % 360 / 60;
  20. var chroma = (1 - Math.abs(2 * lightness - 1)) * saturation;
  21. var secondComponent = chroma * (1 - Math.abs(huePrime % 2 - 1));
  22. var red = 0;
  23. var green = 0;
  24. var blue = 0;
  25. if (huePrime >= 0 && huePrime < 1) {
  26. red = chroma;
  27. green = secondComponent;
  28. } else if (huePrime >= 1 && huePrime < 2) {
  29. red = secondComponent;
  30. green = chroma;
  31. } else if (huePrime >= 2 && huePrime < 3) {
  32. green = chroma;
  33. blue = secondComponent;
  34. } else if (huePrime >= 3 && huePrime < 4) {
  35. green = secondComponent;
  36. blue = chroma;
  37. } else if (huePrime >= 4 && huePrime < 5) {
  38. red = secondComponent;
  39. blue = chroma;
  40. } else if (huePrime >= 5 && huePrime < 6) {
  41. red = chroma;
  42. blue = secondComponent;
  43. }
  44. var lightnessModification = lightness - chroma / 2;
  45. var finalRed = red + lightnessModification;
  46. var finalGreen = green + lightnessModification;
  47. var finalBlue = blue + lightnessModification;
  48. return convert(finalRed, finalGreen, finalBlue);
  49. }
  50. var _default = exports["default"] = hslToRgb;
  51. module.exports = exports.default;