'use client'
import { useLayoutEffect, useEffect, useRef, useState } from 'react'
const useIsomorphicLayoutEffect = typeof window !== 'undefined' ? useLayoutEffect : useEffect
// ─── Config ───────────────────────────────────────────────────────────────────
const SPACING = 20 // px between circle centres
const RADIUS = 200
const BASE_R = 1.5
const BURST_R = 16
const BASE_A_DARK = 0.55
const BASE_A_LIGHT = 0.75
// ─── Types ────────────────────────────────────────────────────────────────────
type Bubble = { x: number; y: number; b: number; phase: number }
export default function BubbleField() {
const containerRef = useRef<HTMLDivElement>(null)
const canvasRef = useRef<HTMLCanvasElement>(null)
const mouseRef = useRef<{ x: number; y: number } | null>(null)
const isDarkRef = useRef(typeof window !== 'undefined' ? document.documentElement.classList.contains('dark') : false)
const [isDark, setIsDark] = useState(() => typeof window !== 'undefined' ? document.documentElement.classList.contains('dark') : false)
// ── Theme detection ────────────────────────────────────────────────────────
useIsomorphicLayoutEffect(() => {
const el = containerRef.current
if (!el) return
const check = () => {
const card = el.closest('[data-card-theme]')
const dark = card
? card.classList.contains('dark')
: document.documentElement.classList.contains('dark')
setIsDark(dark)
isDarkRef.current = dark
}
check()
const observer = new MutationObserver(check)
observer.observe(document.documentElement, { attributes: true, attributeFilter: ['class'] })
const cardWrapper = el.closest('[data-card-theme]')
if (cardWrapper) observer.observe(cardWrapper, { attributes: true, attributeFilter: ['class'] })
return () => observer.disconnect()
}, [])
// ── Canvas render loop ─────────────────────────────────────────────────────
useEffect(() => {
const canvas: HTMLCanvasElement = canvasRef.current!
const ctx = canvas.getContext('2d')!
let bubbles: Bubble[] = []
let animId = 0
let alive = true
let cw = 0, ch = 0
function build() {
const dpr = window.devicePixelRatio || 1
const rect = canvas.getBoundingClientRect()
cw = rect.width
ch = rect.height
if (!cw || !ch) return
canvas.width = Math.round(cw * dpr)
canvas.height = Math.round(ch * dpr)
ctx.setTransform(dpr, 0, 0, dpr, 0, 0)
bubbles = []
const cols = Math.floor(cw / SPACING) + 2
const rows = Math.floor(ch / SPACING) + 2
const ox = (cw % SPACING) / 2
const oy = (ch % SPACING) / 2
for (let r = 0; r < rows; r++) {
for (let c = 0; c < cols; c++) {
bubbles.push({ x: ox + c * SPACING, y: oy + r * SPACING, b: 0, phase: Math.random() })
}
}
}
function frame() {
if (!alive) return
ctx.clearRect(0, 0, cw, ch)
const mx = mouseRef.current?.x ?? -99999
const my = mouseRef.current?.y ?? -99999
const r2 = RADIUS * RADIUS
const dotRGB = isDarkRef.current ? '255,255,255' : '28,25,22'
const baseA = isDarkRef.current ? BASE_A_DARK : BASE_A_LIGHT
for (const bub of bubbles) {
const dx = bub.x - mx
const dy = bub.y - my
const dist2 = dx * dx + dy * dy
const tgt = dist2 < r2 ? Math.exp(-dist2 / (RADIUS * RADIUS * 0.25)) : 0
bub.b += (tgt > bub.b ? 0.16 : 0.07) * (tgt - bub.b)
if (bub.b < 0.004) bub.b = 0
// Advance burst phase — faster at hover centre, slower at edges
if (bub.b > 0.08) {
bub.phase = (bub.phase + 0.025 * bub.b) % 1
}
const p = bub.phase
if (bub.b > 0.08) {
// ── Burst cycle ───────────────────────────────────────────────
if (p < 0.55) {
// Expanding + fading (burst)
const t = p / 0.55 // 0 → 1
const r = BASE_R + t * BURST_R
const alpha = baseA * (1 - t)
if (alpha > 0.004) {
ctx.strokeStyle = `rgba(${dotRGB},${alpha.toFixed(3)})`
ctx.lineWidth = 0.5
ctx.beginPath()
ctx.arc(bub.x, bub.y, r, 0, Math.PI * 2)
ctx.stroke()
}
} else if (p < 0.72) {
// Invisible — fully popped, nothing drawn
} else {
// Reforming — shrinks back into existence
const t = (p - 0.72) / 0.28 // 0 → 1
const r = BASE_R * t
const alpha = baseA * t
if (r > 0.2 && alpha > 0.004) {
ctx.strokeStyle = `rgba(${dotRGB},${alpha.toFixed(3)})`
ctx.lineWidth = 0.5
ctx.beginPath()
ctx.arc(bub.x, bub.y, r, 0, Math.PI * 2)
ctx.stroke()
}
}
} else {
// ── Resting state — normal circle ─────────────────────────────
ctx.strokeStyle = `rgba(${dotRGB},${baseA.toFixed(3)})`
ctx.lineWidth = 0.5
ctx.beginPath()
ctx.arc(bub.x, bub.y, BASE_R, 0, Math.PI * 2)
ctx.stroke()
}
}
animId = requestAnimationFrame(frame)
}
build()
frame()
const ro = new ResizeObserver(build)
ro.observe(canvas.parentElement!)
return () => {
alive = false
cancelAnimationFrame(animId)
ro.disconnect()
}
}, [])
function updateMouse(clientX: number, clientY: number) {
const rect = canvasRef.current?.getBoundingClientRect()
if (!rect) return
mouseRef.current = { x: clientX - rect.left, y: clientY - rect.top }
}
const bg = isDark ? '#110F0C' : '#F5F1EA'
const labelColor = isDark ? 'rgba(255,255,255,0.45)' : 'rgba(28,25,22,0.45)'
const hintColor = isDark ? 'rgba(255,255,255,0.18)' : 'rgba(28,25,22,0.22)'
return (
<div
ref={containerRef}
className="relative min-h-screen w-full overflow-hidden"
style={{ background: bg }}
onMouseMove={(e) => updateMouse(e.clientX, e.clientY)}
onMouseLeave={() => { mouseRef.current = null }}
onTouchMove={(e) => { const t = e.touches[0]; if (t) updateMouse(t.clientX, t.clientY) }}
onTouchEnd={() => { mouseRef.current = null }}
>
<canvas
ref={canvasRef}
className="absolute inset-0"
style={{ width: '100%', height: '100%' }}
/>
<div className="pointer-events-none absolute inset-0 flex flex-col items-center justify-center gap-2">
<span style={{ color: labelColor, fontSize: 22, fontWeight: 700, letterSpacing: '-0.02em' }}>
Bubble Field
</span>
<span style={{ color: hintColor, fontSize: 11, fontWeight: 600, textTransform: 'uppercase', letterSpacing: '0.12em' }}>
hover to burst
</span>
</div>
</div>
)
}
AI Canvas