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32 lines
1.0 KiB
TypeScript
32 lines
1.0 KiB
TypeScript
/* Gets percieved luminance of a color */
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function getLuminance(color: string): number {
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const {r, g, b} = hexToRgb(color);
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return Math.sqrt(0.299 * (r * r) + 0.587 * (g * g) + 0.114 * (b * b));
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}
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/* Converts hex color to rgb color */
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const hexChars = "0123456789abcdef";
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function hexToRgb(hex: string): { r: number; g: number; b: number } | null {
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if (hex.length == 4)
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hex = "#" + hex[1] + hex[1] + hex[2] + hex[2] + hex[3] + hex[3];
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return /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex)
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? {
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r: hexChars.indexOf(hex[1]) * 16 + hexChars.indexOf(hex[2]),
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g: hexChars.indexOf(hex[3]) * 16 + hexChars.indexOf(hex[4]),
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b: hexChars.indexOf(hex[5]) * 16 + hexChars.indexOf(hex[6]),
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}: null;
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}
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/**
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* List of all indexes that have the specified value
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* https://stackoverflow.com/a/54954694/1985387
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*/
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function indexesOf<T>(array: T[], value: T): number[] {
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return array.map((v, i) => v === value ? i : -1).filter(i => i !== -1);
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}
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export const GenericUtils = {
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getLuminance,
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indexesOf
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}
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