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feat: add HSL to RGB color space conversion algorithm#1518
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This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,85 @@ | ||
| /** | ||
| * Given a color in HSL format, convert it to RGB format. | ||
| * | ||
| * @see | ||
| * For more info: https://www.niwa.nu/2013/05/math-behind-colorspace-conversions-rgb-hsl/ | ||
| * | ||
| * @param {number[]} colorHsl - One dimensional array of integers (HSL color format). | ||
| * @returns {number[]} - One dimensional array of integers (RGB color format). | ||
| * | ||
| * @example | ||
| * const colorHsl = [120, 50, 15] | ||
| * | ||
| * const result = hslToRgb(colorHsl) | ||
| * | ||
| * // The function returns the corresponding color in RGB format: | ||
| * // result = [19, 57, 19] | ||
| */ | ||
| const checkHslFormat = (colorHsl) => { | ||
| return ( | ||
| colorHsl[0] >= 0 && | ||
| colorHsl[0] <= 360 && | ||
| colorHsl[1] >= 0 && | ||
| colorHsl[1] <= 100 && | ||
| colorHsl[2] >= 0 && | ||
| colorHsl[2] <= 100 | ||
| ) | ||
| } | ||
| const hslToRgb = (colorHsl) => { | ||
| if (!checkHslFormat(colorHsl)) { | ||
| throw new Error('Input is not a valid HSL color.') | ||
| } | ||
| let luminance = colorHsl[2] / 100 | ||
| // Check if color is a shade of grey | ||
| if (colorHsl[1] === 0) { | ||
| let colorRgb = new Array(3).fill(255 * luminance) | ||
| return colorRgb | ||
| } | ||
| let firstFormula = 0 | ||
| if (luminance < 0.5) { | ||
| firstFormula = luminance * (1 + colorHsl[1] / 100) | ||
| } else { | ||
| firstFormula = | ||
| luminance + colorHsl[1] / 100 - (luminance * colorHsl[1]) / 100 | ||
| } | ||
| let secondFormula = 2 * luminance - firstFormula | ||
| // Normalize Hue | ||
| let hue = colorHsl[0] / 360 | ||
| let colorRgb = colorHsl | ||
| colorRgb[0] = hue + 1 / 3 | ||
| colorRgb[1] = hue | ||
| colorRgb[2] = hue - 1 / 3 | ||
| for (let i = 0; i <= 2; i++) { | ||
| if (colorRgb[i] < 0) { | ||
| colorRgb[i] += 1 | ||
| } else if (colorRgb[i] > 1) { | ||
| colorRgb[i] -= 1 | ||
| } | ||
| if (6 * colorRgb[i] < 1) { | ||
| colorRgb[i] = | ||
| secondFormula + (firstFormula - secondFormula) * 6 * colorRgb[i] | ||
| } else if (2 * colorRgb[i] < 1) { | ||
| colorRgb[i] = firstFormula | ||
| } else if (3 * colorRgb[i] < 2) { | ||
| colorRgb[i] = | ||
| secondFormula + | ||
| (firstFormula - secondFormula) * 6 * (2 / 3 - colorRgb[i]) | ||
| } else { | ||
| colorRgb[i] = secondFormula | ||
| } | ||
| colorRgb[i] = Math.round(colorRgb[i] * 255) | ||
| } | ||
| return colorRgb | ||
| } | ||
| export { hslToRgb } |
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,44 @@ | ||
| import { hslToRgb } from '../HslToRgbConversion' | ||
| describe('HslToRgbConversion', () => { | ||
| test.each([ | ||
| [ | ||
| [311, 84, 46], | ||
| [216, 19, 180] | ||
| ], | ||
| [ | ||
| [119, 83, 41], | ||
| [21, 191, 18] | ||
| ], | ||
| [ | ||
| [225, 33, 47], | ||
| [80, 100, 159] | ||
| ], | ||
| [ | ||
| [349, 98, 16], | ||
| [81, 1, 15] | ||
| ], | ||
| [ | ||
| [96, 100, 4], | ||
| [8, 20, 0] | ||
| ], | ||
| [ | ||
| [0, 0, 0], | ||
| [0, 0, 0] | ||
| ], | ||
| [ | ||
| [0, 0, 100], | ||
| [255, 255, 255] | ||
| ] | ||
| ])('Should return the color in RGB format.', (colorHsl, expected) => { | ||
| expect(hslToRgb(colorHsl)).toEqual(expected) | ||
| }) | ||
| test.each([ | ||
| [[360, 180, 9], 'Input is not a valid HSL color.'], | ||
| [[-90, 46, 8], 'Input is not a valid HSL color.'], | ||
| [[1, 39, 900], 'Input is not a valid HSL color.'], | ||
| [[1, 139, 100], 'Input is not a valid HSL color.'] | ||
| ])('Should return the error message.', (colorHsl, expected) => { | ||
| expect(() => hslToRgb(colorHsl)).toThrowError(expected) | ||
| }) | ||
| }) |
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