| 1 | export const LightenDarkenColor = (col, amt) => {
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| 2 | let usePound = false;
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| 3 |
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| 4 | if (col[0] === '#') {
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| 5 | col = col.slice(1);
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| 6 | usePound = true;
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| 7 | }
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| 8 |
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| 9 | const num = parseInt(col, 16);
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| 10 |
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| 11 | let r = (num >> 16) + amt;
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| 12 |
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| 13 | if (r > 255) r = 255;
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| 14 | else if (r < 0) r = 0;
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| 15 |
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| 16 | let b = ((num >> 8) & 0x00FF) + amt;
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| 17 |
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| 18 | if (b > 255) b = 255;
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| 19 | else if (b < 0) b = 0;
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| 20 |
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| 21 | let g = (num & 0x0000FF) + amt;
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| 22 |
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| 23 | if (g > 255) g = 255;
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| 24 | else if (g < 0) g = 0;
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| 25 |
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| 26 | return (usePound ? '#' : '') + (g | (b << 8) | (r << 16)).toString(16);
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| 27 | };
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