Created
November 12, 2021 16:18
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Rainbow bg from https://potato.horse
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| import { useEffect } from 'react' | |
| export const useRainbowBg = () => | |
| useEffect(() => { | |
| const cb = () => { | |
| const viewportHeight = window.innerHeight | |
| const contentHeight = document.body.getBoundingClientRect().height | |
| const viewportsPerRotation = Math.min( | |
| 3, | |
| contentHeight / viewportHeight | |
| ) | |
| const from = 51 | |
| const to = 219 | |
| const progress = | |
| window.scrollY / (viewportHeight * viewportsPerRotation) | |
| const h = from + (to - from) * progress | |
| document.body.style.backgroundColor = `hsl(${h}deg 100% 50%)` | |
| } | |
| window.addEventListener('scroll', cb, { passive: true }) | |
| return () => window.removeEventListener('scroll', cb) | |
| }) |
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