; } return (

{item.text}

); } /** Paper proof: neutral sheet with an inked plate and a caption in the margin. */ function Proof({ item, w, h, proof }: { item: ImprintItem; w: number; h: number; proof: boolean }) { const pad = Math.max(4, Math.round(w * 0.045)); const label = item.label ?? (proof ? "Proof" : undefined); return (

{/* Ink texture: a soft inner edge so the plate reads pressed, not pasted. */}

{label ? (

{proof ? "Proof" : label} {Math.round(w)}×{Math.round(h)}

) : null}

); } const StampView = React.memo(function StampView({ stamp, item, size, life, onDone, }: { stamp: Stamp; item: ImprintItem; size: number; life: number; onDone: (id: number) => void; }) { const w = stamp.proof ? size * 1.45 : size; const h = w * 1.25; return ( onDone(stamp.id)} > {/* Ink spread: blooms on impact, then tightens to a resting shadow. */}

{/* Registration copy: a faint misaligned second pass that snaps into place. */} ); }); /** * Imprint — a letterpress image trail. Moving the pointer (mouse, pen or * touch) through the scoped container stamps a pile of proofs every `spacing` * px of travel. Each lands with a quick settle, a seeded tilt, a faint * registration double that snaps into place and an ink-spread shadow that * blooms then tightens; after `life` ms it desaturates and fades like aging * paper. Clicks stack larger "proof" stamps. With no pointer for 1.5s a seeded * Lissajous ghost keeps printing (paused offscreen and on hidden tabs). The * trail layer is decorative and `pointer-events-none`; children stay * interactive. Under reduced motion there is no trail — a static loose pile * of three proofs rests in the corner. */ export function Imprint({ children, className, items, spacing = 90, size = 140, max = 12, life = 1600, rotate = 6, idle = true, seed = 7, paused = false, ref, }: ImprintProps) { const reducedMotion = useReducedMotion(); const fallbackItems = React.useMemo(() => defaultItems(seed), [seed]); const pool = items && items.length > 0 ? items : fallbackItems; const [stamps, setStamps] = React.useState([]); // Hot-path state lives in refs; React only hears about it once per frame. const pendingRef = React.useRef([]); const flushRafRef = React.useRef(0); const counterRef = React.useRef(0); const anchorRef = React.useRef<{ x: number; y: number } | null>(null); const lastActivityRef = React.useRef(0); const sizeRef = React.useRef({ w: 0, h: 0 }); const ghostRef = React.useRef<{ t: number; last: number; travel: number; px: number; py: number; on: boolean }>({ t: 0, last: 0, travel: 0, px: 0, py: 0, on: false, }); const optsRef = React.useRef({ spacing, max, rotate, seed, pool, paused, reducedMotion }); optsRef.current = { spacing, max, rotate, seed, pool, paused, reducedMotion }; const flush = React.useCallback(() => { flushRafRef.current = 0; const fresh = pendingRef.current; if (fresh.length === 0) return; pendingRef.current = []; const cap = Math.max(1, optsRef.current.max); setStamps((prev) => { let next = prev.concat(fresh); // Beyond the cap the oldest live stamps lift off quickly instead of popping. let live = 0; for (let i = next.length - 1; i >= 0; i--) { if (next[i].retiring) continue; live++; if (live > cap) next[i] = { ...next[i], retiring: true }; } // Hard ceiling on DOM nodes even under extreme input. if (next.length > cap * 2) next = next.slice(next.length - cap * 2); return next; }); }, []); const enqueue = React.useCallback( (x: number, y: number, proof = false) => { const o = optsRef.current; if (o.reducedMotion) return; const n = counterRef.current++; const r = (k: number) => hash01(o.seed, n * 5 + k); const angle = r(2) * Math.PI * 2; const off = 1 + r(3); // 1–2px registration error pendingRef.current.push({ id: n, x, y, rot: (r(0) * 2 - 1) * o.rotate * (proof ? 0.6 : 1), dx: Math.cos(angle) * off, dy: Math.sin(angle) * off, item: n % o.pool.length, proof, retiring: false, }); if (!flushRafRef.current) flushRafRef.current = requestAnimationFrame(flush); }, [flush] ); const onDone = React.useCallback((id: number) => { setStamps((prev) => prev.filter((s) => s.id !== id)); }, []); /** Advance an anchor toward (x, y), stamping every `spacing` px of travel. */ const travel = React.useCallback( (x: number, y: number) => { const step = Math.max(8, optsRef.current.spacing); const a = anchorRef.current; if (!a) { anchorRef.current = { x, y }; enqueue(x, y); return; } let dist = Math.hypot(x - a.x, y - a.y); let made = 0; while (dist >= step && made < MAX_PER_MOVE) { const f = step / dist; a.x += (x - a.x) * f; a.y += (y - a.y) * f; enqueue(a.x, a.y); made++; dist = Math.hypot(x - a.x, y - a.y); } // A flick longer than the per-event budget re-anchors at the pointer. if (made === MAX_PER_MOVE && dist >= step) { a.x = x; a.y = y; } }, [enqueue] ); // Ghost driver: rAF via useVisibilityPause, so it sleeps offscreen / hidden. const tick = React.useCallback( (elapsed: number) => { const g = ghostRef.current; const dt = Math.min(Math.max(elapsed - g.last, 0), 0.05); g.last = elapsed; const { w, h } = sizeRef.current; if (w < 2 || h < 2) return; const now = performance.now(); if (now - lastActivityRef.current < IDLE_MS) { g.on = false; return; } const s = optsRef.current.seed; const fa = 2 + Math.floor(hash01(s, 900) * 2); // 2 or 3 const fb = fa + 1 + Math.floor(hash01(s, 901) * 2); const phase = hash01(s, 902) * Math.PI * 2; const ax = w * 0.36; const ay = h * 0.32; // Parametric speed roughly normalised to GHOST_SPEED px/s. g.t += (dt * GHOST_SPEED) / Math.max(120, (ax * fa + ay * fb) * 0.75); const x = w / 2 + ax * Math.sin(fa * g.t + phase); const y = h / 2 + ay * Math.sin(fb * g.t); if (!g.on) { g.on = true; g.px = x; g.py = y; g.travel = optsRef.current.spacing * 0.6; return; } g.travel += Math.hypot(x - g.px, y - g.py); g.px = x; g.py = y; if (g.travel >= Math.max(8, optsRef.current.spacing)) { g.travel = 0; enqueue(x, y); } }, [enqueue] ); const scopeRef = useVisibilityPause(tick, { paused: !idle || paused || reducedMotion }); React.useEffect(() => { const el = scopeRef.current; if (!el) return; lastActivityRef.current = performance.now(); const ro = new ResizeObserver(() => { sizeRef.current = { w: el.clientWidth, h: el.clientHeight }; }); ro.observe(el); sizeRef.current = { w: el.clientWidth, h: el.clientHeight }; const local = (e: PointerEvent) => { const rect = el.getBoundingClientRect(); return { x: e.clientX - rect.left, y: e.clientY - rect.top }; }; const onMove = (e: PointerEvent) => { lastActivityRef.current = performance.now(); ghostRef.current.on = false; if (optsRef.current.paused) return; const p = local(e); travel(p.x, p.y); }; const onDown = (e: PointerEvent) => { lastActivityRef.current = performance.now(); if (optsRef.current.paused || e.button > 0) return; const p = local(e); enqueue(p.x, p.y, true); anchorRef.current = { x: p.x, y: p.y }; }; const onLeave = () => { anchorRef.current = null; }; el.addEventListener("pointermove", onMove); el.addEventListener("pointerdown", onDown); el.addEventListener("pointerleave", onLeave); el.addEventListener("pointercancel", onLeave); return () => { ro.disconnect(); el.removeEventListener("pointermove", onMove); el.removeEventListener("pointerdown", onDown); el.removeEventListener("pointerleave", onLeave); el.removeEventListener("pointercancel", onLeave); if (flushRafRef.current) cancelAnimationFrame(flushRafRef.current); flushRafRef.current = 0; pendingRef.current = []; anchorRef.current = null; }; }, [scopeRef, travel, enqueue]); // Reduced motion (or a live toggle into it): clear the trail. React.useEffect(() => { if (reducedMotion) { pendingRef.current = []; setStamps([]); } }, [reducedMotion]); React.useImperativeHandle( ref, () => ({ stamp(x, y, options) { const { w, h } = sizeRef.current; enqueue(x ?? w / 2, y ?? h / 2, options?.proof ?? false); }, }), [enqueue] ); return (

{reducedMotion ? ( ) : ( stamps.map((s) => ( )) )}

{children}

); } /** Reduced-motion resting frame: three proofs loosely piled in the bottom-right corner. */ function StaticPile({ pool, size, seed, rotate }: { pool: ImprintItem[]; size: number; seed: number; rotate: number }) { const w = Math.min(size, 120); const h = w * 1.25; return (

{[0, 1, 2].map((i) => { const rot = (hash01(seed, 500 + i) * 2 - 1) * Math.max(rotate, 4) * 1.4; return (

); })}

); } ```