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Beyond it, // lines turn noticeably later, so the pull ripples outward. const HALF_PULL = 90; // Even the farthest lines keep this share, so none ever feels stuck. const FAR_STIFFNESS = 0.18; // The idle wave: a slow tilt that travels diagonally across the grid. const WAVE_SPEED = 0.7; const WAVE_SWING = 0.45; // Soft, so letting go reads as the field relaxing back into the wave. const WAVE_STIFFNESS = 40; const REST = 0.001; // A page left open shouldn't animate forever: after this long without // pointer activity the wave freezes, and any pointer wakes it again. const IDLE_PAUSE = 10_000; type Point = { x: number; y: number }; // Segments have no head, so a line pointing at the cursor or directly away // looks the same. Wrapping by half a turn means one never spins 180deg. function halfTurn(delta: number) { return delta - Math.PI * Math.round(delta / Math.PI); } export function MagnetLines({ className }: { className?: string }) { const reduce = useReducedMotion() ?? false; const wrapRef = useRef(null); const canvasRef = useRef(null); useEffect(() => { const wrap = wrapRef.current; const canvas = canvasRef.current; const ctx = canvas?.getContext("2d"); if (!wrap || !canvas || !ctx) return; const count = COLS * ROWS; // Flat typed arrays keep the per-frame loop allocation free. const baseX = new Float32Array(count); const baseY = new Float32Array(count); const angle = new Float32Array(count); const spin = new Float32Array(count); // 0 far away, 1 under the pointer; eased so brightness never pops. const near = new Float32Array(count); let width = 0; let height = 0; let pointer: Point | null = null; let last: Point | null = null; let frameId = 0; let pending = 0; let then = 0; let inView = true; let visible = true; let activeAt = performance.now(); let waveT = performance.now() / 1000; let dim = ""; let lit = ""; const wave = (i: number, t: number) => { const c = i % COLS; const r = (i / COLS) | 0; return ( Math.PI / 4 + WAVE_SWING * Math.sin(t * WAVE_SPEED - c * 0.45 - r * 0.35) ); }; const readColors = () => { // Computed colors resolve light-dark(), which a raw custom property doesn't. dim = getComputedStyle(canvas).color; lit = getComputedStyle(wrap).color; }; const layout = () => { const dpr = window.devicePixelRatio || 1; width = wrap.clientWidth; height = wrap.clientHeight; canvas.width = Math.round(width * dpr); canvas.height = Math.round(height * dpr); ctx.setTransform(dpr, 0, 0, dpr, 0, 0); // Each line sits in the middle of an equal cell, so margins match. const cellX = width / COLS; const cellY = height / ROWS; for (let i = 0; i < count; i++) { baseX[i] = (i % COLS) * cellX + cellX / 2; baseY[i] = ((i / COLS) | 0) * cellY + cellY / 2; } }; const segment = (i: number) => { const half = (LENGTH * (1 + GROW * near[i])) / 2; const dx = Math.cos(angle[i]) * half; const dy = Math.sin(angle[i]) * half; ctx.moveTo(baseX[i] - dx, baseY[i] - dy); ctx.lineTo(baseX[i] + dx, baseY[i] + dy); }; const draw = () => { ctx.clearRect(0, 0, width, height); ctx.lineWidth = WIDTH; ctx.lineCap = "round"; // One batched path for the whole field; only the energised lines get // a second, brighter pass on top. ctx.strokeStyle = dim; ctx.beginPath(); for (let i = 0; i < count; i++) segment(i); ctx.stroke(); ctx.strokeStyle = lit; for (let i = 0; i < count; i++) { if (near[i] < 0.02) continue; ctx.globalAlpha = Math.min(1, near[i]); ctx.beginPath(); segment(i); ctx.stroke(); } ctx.globalAlpha = 1; }; const nearness = (i: number, p: Point) => { const d = Math.hypot(baseX[i] - p.x, baseY[i] - p.y); return Math.max(0, 1 - d / FIELD) ** 2; }; // Reduced motion: every line turns to the pointer in one step, no swing. const orientOnce = (p: Point) => { for (let i = 0; i < count; i++) { angle[i] = Math.atan2(p.y - baseY[i], p.x - baseX[i]); near[i] = nearness(i, p); } draw(); }; const step = (now: number) => { // Clamped so a dropped frame can't kick the springs into orbit. const dt = Math.min((now - then) / 1000, 1 / 30); then = now; // The wave's own clock stops once idle, so its targets hold still, the // springs settle and the loop sleeps. Resuming picks up where it froze. const waving = !pointer && now - activeAt < IDLE_PAUSE; if (waving) waveT += dt; const t = waveT; let moving = waving; for (let i = 0; i < count; i++) { let target: number; let k: number; let n = 0; if (pointer) { target = Math.atan2(pointer.y - baseY[i], pointer.x - baseX[i]); const d = Math.hypot(baseX[i] - pointer.x, baseY[i] - pointer.y); k = STIFFNESS * (FAR_STIFFNESS + (1 - FAR_STIFFNESS) / (1 + d / HALF_PULL)); n = nearness(i, pointer); } else { target = wave(i, t); k = WAVE_STIFFNESS; } const damping = 2 * DAMPING_RATIO * Math.sqrt(k); const delta = halfTurn(target - angle[i]); spin[i] += (k * delta - damping * spin[i]) * dt; angle[i] += spin[i] * dt; // A plain ease is enough for brightness; it only has to avoid popping. near[i] += (n - near[i]) * Math.min(1, dt * 12); if ( Math.abs(delta) > REST || Math.abs(spin[i]) > REST || Math.abs(n - near[i]) > REST ) { moving = true; } } draw(); // With the pointer resting, everything settles and the loop sleeps. // Without one, the idle wave runs for a while, but only on screen. frameId = moving && visible ? requestAnimationFrame(step) : 0; }; const wake = () => { if (frameId || !visible || reduce) return; then = performance.now(); frameId = requestAnimationFrame(step); }; const aim = (e: PointerEvent) => { activeAt = performance.now(); const box = canvas.getBoundingClientRect(); const p = { x: e.clientX - box.left, y: e.clientY - box.top }; last = p; if (reduce) { // One draw per frame at most; pointermove can fire far faster. if (!pending) { pending = requestAnimationFrame(() => { pending = 0; if (last) orientOnce(last); }); } return; } pointer = p; wake(); }; const release = () => { // Reduced motion keeps the last orientation instead of drifting back. if (reduce) return; activeAt = performance.now(); pointer = null; wake(); }; const onMove = (e: PointerEvent) => { // A finger only steers while pressed, which onDown captures. if (e.pointerType === "touch" && !canvas.hasPointerCapture(e.pointerId)) { return; } aim(e); }; const onDown = (e: PointerEvent) => { if (e.pointerType !== "touch") return; canvas.setPointerCapture(e.pointerId); aim(e); }; const onUp = (e: PointerEvent) => { if (e.pointerType === "touch") release(); }; const onLeave = (e: PointerEvent) => { if (e.pointerType !== "touch") release(); }; readColors(); layout(); if (reduce) waveT = 0; for (let i = 0; i < count; i++) angle[i] = wave(i, waveT); draw(); wake(); const resize = new ResizeObserver(() => { layout(); if (reduce && last) orientOnce(last); else draw(); }); resize.observe(wrap); const repaint = () => requestAnimationFrame(() => { readColors(); if (!frameId) draw(); }); const theme = new MutationObserver(repaint); theme.observe(document.documentElement, { attributes: true, attributeFilter: ["data-theme"], }); const scheme = window.matchMedia("(prefers-color-scheme: dark)"); scheme.addEventListener("change", repaint); // Offscreen or in a hidden tab, the loop stops entirely, wave included. // Coming back counts as activity, so the wave plays again for a while. const sync = () => { const was = visible; visible = inView && !document.hidden; if (visible && !was) { activeAt = performance.now(); wake(); } else if (!visible && frameId) { cancelAnimationFrame(frameId); frameId = 0; } }; const seen = new IntersectionObserver(([entry]) => { inView = entry.isIntersecting; sync(); }); seen.observe(wrap); document.addEventListener("visibilitychange", sync); canvas.addEventListener("pointermove", onMove); canvas.addEventListener("pointerdown", onDown); canvas.addEventListener("pointerup", onUp); canvas.addEventListener("pointercancel", onUp); canvas.addEventListener("pointerleave", onLeave); return () => { cancelAnimationFrame(frameId); cancelAnimationFrame(pending); resize.disconnect(); theme.disconnect(); seen.disconnect(); document.removeEventListener("visibilitychange", sync); scheme.removeEventListener("change", repaint); canvas.removeEventListener("pointermove", onMove); canvas.removeEventListener("pointerdown", onDown); canvas.removeEventListener("pointerup", onUp); canvas.removeEventListener("pointercancel", onUp); canvas.removeEventListener("pointerleave", onLeave); }; }, [reduce]); return (

{/* touch-none: while a finger is down it steers the field, so the page shouldn't scroll out from under it. */}

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