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61 lines
1.2 KiB
TypeScript
61 lines
1.2 KiB
TypeScript
/**
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* @link https://css-tricks.com/snippets/javascript/lighten-darken-color/
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*
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* @author Chris Coyier
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*/
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function LightenDarkenColor(col, amt) {
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let usePound = false;
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if (col[0] == "#") {
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col = col.slice(1);
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usePound = true;
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}
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const num = parseInt(col, 16)
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let r = (num >> 16) + amt;
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if (r > 255) r = 255;
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else if (r < 0) r = 0;
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let b = ((num >> 8) & 0x00FF) + amt;
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if (b > 255) b = 255;
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else if (b < 0) b = 0;
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let g = (num & 0x0000FF) + amt;
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if (g > 255) g = 255;
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else if (g < 0) g = 0;
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return (usePound?"#":"") + (g | (b << 8) | (r << 16)).toString(16);
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}
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export const transparentize = (col: string, amt: number) => {
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if (col[0] == "#") {
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col = col.slice(1);
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}
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const num = parseInt(col, 16)
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let r = (num >> 16) + amt;
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if (r > 255) r = 255;
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else if (r < 0) r = 0;
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let b = ((num >> 8) & 0x00FF) + amt;
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if (b > 255) b = 255;
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else if (b < 0) b = 0;
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let g = (num & 0x0000FF) + amt;
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if (g > 255) g = 255;
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else if (g < 0) g = 0;
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return `rgba(${r}, ${b}, ${g}, ${1 - amt / 100})`
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}
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export const lighten = (color: string, amount: number) => LightenDarkenColor(color, amount)
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export const darken = (color: string, amount: number) => LightenDarkenColor(color, -amount)
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