46 lines
717 B
TypeScript
46 lines
717 B
TypeScript
export default function hexToHSL(hex: string) {
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const result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex)
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if(!result) {
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return null
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}
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let r = parseInt(result[1], 16)
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let g = parseInt(result[2], 16)
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let b = parseInt(result[3], 16)
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r /= 255
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g /= 255
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b /= 255
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const max = Math.max(r, g, b)
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const min = Math.min(r, g, b)
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let h = 0
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let s = 0
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const l = (max + min) / 2
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if(max === min) {
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h = s = 0
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} else {
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const d = max - min
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s = l > 0.5 ? d / (2 - max - min) : d / (max + min)
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switch(max) {
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case r:
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h = (g - b) / d + (g < b ? 6 : 0)
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break
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case g:
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h = (b - r) / d + 2
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break
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case b:
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h = (r - g) / d + 4
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break
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}
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h /= 6
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}
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return {h, s, l}
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}
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