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| 1 | +import * as React from 'react' |
| 2 | +import { twMerge } from 'tailwind-merge' |
| 3 | + |
| 4 | +import { useMounted } from '@/hooks/use-mounted' |
| 5 | +import { usePrefersReducedMotion } from '@/hooks/use-preferred-reduced-motion' |
| 6 | + |
| 7 | +export function BackgroundAnimation() { |
| 8 | + const canvasRef = React.useRef<HTMLCanvasElement>(null) |
| 9 | + const prefersReducedMotion = usePrefersReducedMotion() |
| 10 | + const mounted = useMounted() |
| 11 | + const isHomePage = false |
| 12 | + |
| 13 | + React.useEffect(() => { |
| 14 | + if (prefersReducedMotion !== false) { |
| 15 | + return |
| 16 | + } |
| 17 | + |
| 18 | + const canvas = canvasRef.current |
| 19 | + |
| 20 | + let morphDuration = 2000 |
| 21 | + const waitDuration = 1000 * 60 * 2 |
| 22 | + |
| 23 | + const easingFn = cubicBezier(0.645, 0.045, 0.355, 1.0) |
| 24 | + |
| 25 | + if (canvas) { |
| 26 | + const ctx = canvas.getContext('2d')! |
| 27 | + |
| 28 | + let rafId: ReturnType<typeof requestAnimationFrame> | null = null |
| 29 | + let timeout: ReturnType<typeof setTimeout> | null = null |
| 30 | + let startTime = performance.now() |
| 31 | + |
| 32 | + function createBlobs() { |
| 33 | + return shuffle([ |
| 34 | + { |
| 35 | + color: { h: 10, s: 100, l: 50 }, |
| 36 | + }, |
| 37 | + { |
| 38 | + color: { h: 40, s: 100, l: 50 }, |
| 39 | + }, |
| 40 | + { |
| 41 | + color: { h: 150, s: 100, l: 50 }, |
| 42 | + }, |
| 43 | + { |
| 44 | + color: { h: 200, s: 100, l: 50 }, |
| 45 | + }, |
| 46 | + ]).map((blob) => ({ |
| 47 | + ...blob, |
| 48 | + x: Math.random() * canvas!.width, |
| 49 | + y: Math.random() * canvas!.height, |
| 50 | + r: Math.random() * 500 + 700, |
| 51 | + colorH: blob.color.h, |
| 52 | + colorS: blob.color.s, |
| 53 | + colorL: blob.color.l, |
| 54 | + })) |
| 55 | + } |
| 56 | + |
| 57 | + function shuffle<T>(array: T[]) { |
| 58 | + for (let i = array.length - 1; i > 0; i--) { |
| 59 | + const j = Math.floor(Math.random() * (i + 1)) |
| 60 | + ;[array[i], array[j]] = [array[j], array[i]] |
| 61 | + } |
| 62 | + return array |
| 63 | + } |
| 64 | + |
| 65 | + let startBlobs = createBlobs() |
| 66 | + let currentBlobs = startBlobs |
| 67 | + let targetBlobs: ReturnType<typeof createBlobs> = [] |
| 68 | + |
| 69 | + function resizeHandler() { |
| 70 | + // Create an offscreen canvas and copy the current content |
| 71 | + const offscreen = document.createElement('canvas') |
| 72 | + offscreen.width = canvas!.width |
| 73 | + offscreen.height = canvas!.height |
| 74 | + offscreen.getContext('2d')!.drawImage(canvas!, 0, 0) |
| 75 | + |
| 76 | + // Resize the main canvas |
| 77 | + canvas!.width = window.innerWidth |
| 78 | + canvas!.height = window.innerHeight |
| 79 | + |
| 80 | + // Stretch and redraw the saved content to fill the new size |
| 81 | + ctx.drawImage(offscreen, 0, 0, canvas!.width, canvas!.height) |
| 82 | + } |
| 83 | + |
| 84 | + function start() { |
| 85 | + if (timeout) { |
| 86 | + clearTimeout(timeout) |
| 87 | + } |
| 88 | + if (rafId) { |
| 89 | + cancelAnimationFrame(rafId) |
| 90 | + } |
| 91 | + |
| 92 | + startBlobs = JSON.parse(JSON.stringify(currentBlobs)) |
| 93 | + targetBlobs = createBlobs() |
| 94 | + startTime = performance.now() |
| 95 | + animate() |
| 96 | + } |
| 97 | + |
| 98 | + function animate() { |
| 99 | + ctx.clearRect(0, 0, canvas!.width, canvas!.height) |
| 100 | + |
| 101 | + const time = performance.now() - startTime |
| 102 | + const progress = time / morphDuration |
| 103 | + const easedProgress = easingFn(progress) |
| 104 | + |
| 105 | + // Draw the blobs |
| 106 | + startBlobs.forEach((startBlob, i) => { |
| 107 | + const targetBlob = targetBlobs[i] |
| 108 | + |
| 109 | + currentBlobs[i].x = interpolate( |
| 110 | + startBlob.x, |
| 111 | + targetBlob.x, |
| 112 | + easedProgress, |
| 113 | + ) |
| 114 | + currentBlobs[i].y = interpolate( |
| 115 | + startBlob.y, |
| 116 | + targetBlob.y, |
| 117 | + easedProgress, |
| 118 | + ) |
| 119 | + |
| 120 | + const gradient = ctx.createRadialGradient( |
| 121 | + currentBlobs[i].x, |
| 122 | + currentBlobs[i].y, |
| 123 | + 0, |
| 124 | + currentBlobs[i].x, |
| 125 | + currentBlobs[i].y, |
| 126 | + currentBlobs[i].r, |
| 127 | + ) |
| 128 | + |
| 129 | + currentBlobs[i].colorH = interpolate( |
| 130 | + startBlob.colorH, |
| 131 | + targetBlob.colorH, |
| 132 | + easedProgress, |
| 133 | + ) |
| 134 | + currentBlobs[i].colorS = interpolate( |
| 135 | + startBlob.colorS, |
| 136 | + targetBlob.colorS, |
| 137 | + easedProgress, |
| 138 | + ) |
| 139 | + currentBlobs[i].colorL = interpolate( |
| 140 | + startBlob.colorL, |
| 141 | + targetBlob.colorL, |
| 142 | + easedProgress, |
| 143 | + ) |
| 144 | + |
| 145 | + gradient.addColorStop( |
| 146 | + 0, |
| 147 | + `hsla(${currentBlobs[i].colorH}, ${currentBlobs[i].colorS}%, ${currentBlobs[i].colorL}%, 1)`, |
| 148 | + ) |
| 149 | + gradient.addColorStop( |
| 150 | + 1, |
| 151 | + `hsla(${currentBlobs[i].colorH}, ${currentBlobs[i].colorS}%, ${currentBlobs[i].colorL}%, 0)`, |
| 152 | + ) |
| 153 | + |
| 154 | + ctx.fillStyle = gradient |
| 155 | + ctx.beginPath() |
| 156 | + ctx.arc( |
| 157 | + currentBlobs[i].x, |
| 158 | + currentBlobs[i].y, |
| 159 | + currentBlobs[i].r, |
| 160 | + 0, |
| 161 | + Math.PI * 2, |
| 162 | + ) |
| 163 | + ctx.fill() |
| 164 | + }) |
| 165 | + |
| 166 | + if (progress < 1) { |
| 167 | + rafId = requestAnimationFrame(animate) |
| 168 | + } else { |
| 169 | + timeout = setTimeout(() => { |
| 170 | + morphDuration = 4000 |
| 171 | + start() |
| 172 | + }, waitDuration) |
| 173 | + } |
| 174 | + } |
| 175 | + |
| 176 | + resizeHandler() |
| 177 | + start() |
| 178 | + window.addEventListener('resize', resizeHandler) |
| 179 | + |
| 180 | + return () => { |
| 181 | + if (rafId) { |
| 182 | + cancelAnimationFrame(rafId) |
| 183 | + } |
| 184 | + if (timeout) { |
| 185 | + clearTimeout(timeout) |
| 186 | + } |
| 187 | + window.removeEventListener('resize', resizeHandler) |
| 188 | + } |
| 189 | + } |
| 190 | + }, [prefersReducedMotion]) |
| 191 | + |
| 192 | + return ( |
| 193 | + <div |
| 194 | + className={twMerge( |
| 195 | + 'fixed inset-0 z-0 opacity-20 pointer-events-none', |
| 196 | + 'transition-opacity duration-[2s] ease-linear', |
| 197 | + '[&+*]:relative', |
| 198 | + mounted |
| 199 | + ? isHomePage |
| 200 | + ? 'opacity-10 dark:opacity-20' |
| 201 | + : 'opacity-10 dark:opacity-20' |
| 202 | + : 'opacity-0', |
| 203 | + )} |
| 204 | + > |
| 205 | + <canvas ref={canvasRef} /> |
| 206 | + </div> |
| 207 | + ) |
| 208 | +} |
| 209 | + |
| 210 | +function cubicBezier(p1x: number, p1y: number, p2x: number, p2y: number) { |
| 211 | + return function (t: number) { |
| 212 | + const cx = 3 * p1x |
| 213 | + const bx = 3 * (p2x - p1x) - cx |
| 214 | + const ax = 1 - cx - bx |
| 215 | + |
| 216 | + const cy = 3 * p1y |
| 217 | + const by = 3 * (p2y - p1y) - cy |
| 218 | + const ay = 1 - cy - by |
| 219 | + |
| 220 | + const x = ((ax * t + bx) * t + cx) * t |
| 221 | + const y = ((ay * t + by) * t + cy) * t |
| 222 | + |
| 223 | + return y |
| 224 | + } |
| 225 | +} |
| 226 | + |
| 227 | +function interpolate(start: number, end: number, progress: number) { |
| 228 | + return start + (end - start) * progress |
| 229 | +} |
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