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Every tile's position is a pure // function of elapsed time since its own spawn (t=0 at the left edge), // evaluated fresh each rAF tick and written straight to that tile's // transform — nothing is animated with CSS transitions or React state. // // Timing (all fixed, none randomised): // - spawn: one tile every 900ms at the left edge. // - main line rate: reaches the diverter point (72% of track width) at // 1.6s after spawn — this rate is held constant for the whole tile // lifetime, before and after the loop. // - kickout: exactly every 6th tile (a counter, never Math.random()) is // diverted. ~16.7% is a deliberate legibility amplification over the // real ~2-5% recirculation rate, documented, not a claim about real // jam frequency. // - diverter swing: 150ms, the tile visibly leaves the main line onto the // loop path (not a fade) as the arm swings out and re-seats. // - loop transit: 1.9s around the side loop, re-entering the main line at // a fixed point 18% of track width (behind the diverter) — a second // full attempt, not a respawn — then continuing to the right edge at // the same constant rate as any other tile. // - exit: both first-pass and recirculated tiles fade over 250ms on // reaching the right edge. // // Legibility: the one thing to follow is the diverter arm swinging a // single tile off the line onto the loop and back — cadence is one // kickout roughly every 5.4s (900ms * 6), well inside "watch it happen" // pacing, and the swing is a visible mechanical gesture rather than an // instant cut so the eye can track departure and arrival, not a blink. // --------------------------------------------------------------------------- const SPAWN_MS = 900; const KICK_EVERY = 6; // 1-in-6 tiles diverted, fixed counter const T_MAIN1 = 1600; // ms, left edge -> diverter point (72% of track) const DIVERT_FRAC = 0.72; const REENTRY_FRAC = 0.18; const T_SWING = 150; // ms, diverter arm swing const T_LOOP = 1900; // ms, loop transit const T_FADE = 250; // ms, exit fade const TILE_W = 13; const TILE_H = 7; const POOL_SIZE = 20; // headroom above max concurrently-alive tiles interface Item { id: number; spawnTime: number; kicked: boolean; } interface Geometry { w: number; h: number; x0: number; // left edge (spawn x) trackW: number; // usable track width mainY: number; loopY: number; // bottom of the side loop dx: number; // diverter x (px) rx: number; // re-entry x (px) arcR: number; // loop corner radius, for path + tile keyframe match rate: number; // px/ms, constant main-line rate mainDurFull: number; // ms, non-kicked left edge -> right edge mainDur2: number; // ms, kicked re-entry -> right edge } function computeGeometry(w: number, h: number): Geometry { const loopY_depth = 0.3 * Math.min(w, h); const x0 = Math.min(10, w * 0.03); const trackW = Math.max(1, w - x0 * 2); const mainY = Math.max(18, Math.min(h - loopY_depth - 14, h * 0.42)); const loopY = mainY + loopY_depth; const dx = x0 + DIVERT_FRAC * trackW; const rx = x0 + REENTRY_FRAC * trackW; const arcR = Math.max(4, Math.min(loopY_depth * 0.5, (dx - rx) * 0.22)); const rate = (DIVERT_FRAC * trackW) / T_MAIN1; const mainDurFull = trackW / rate; const mainDur2 = (x0 + trackW - rx) / rate; return { w, h, x0, trackW, mainY, loopY, dx, rx, arcR, rate, mainDurFull, mainDur2 }; } /** Loop-transit keyframe: swing-end point -> bottom-right corner -> * bottom-left corner -> re-entry point, matching the static loop . */ function loopPosition(f: number, g: Geometry, swingEndX: number, swingEndY: number): { x: number; y: number } { const p0 = { x: swingEndX, y: swingEndY }; const p1 = { x: g.dx - g.arcR, y: g.loopY }; const p2 = { x: g.rx + g.arcR, y: g.loopY }; const p3 = { x: g.rx, y: g.mainY }; if (f < 0.2) { const t = f / 0.2; return { x: p0.x + (p1.x - p0.x) * t, y: p0.y + (p1.y - p0.y) * t }; } if (f < 0.8) { const t = (f - 0.2) / 0.6; return { x: p1.x + (p2.x - p1.x) * t, y: p1.y }; } const t = (f - 0.8) / 0.2; return { x: p2.x + (p3.x - p2.x) * t, y: p2.y + (p3.y - p2.y) * t }; } interface Pose { x: number; y: number; opacity: number; alive: boolean; swingActive: boolean; swingFrac: number; // 0..1 while swingActive, for the arm } function poseAt(t: number, kicked: boolean, g: Geometry): Pose { if (!kicked) { if (t < g.mainDurFull) { return { x: g.x0 + g.rate * t, y: g.mainY, opacity: 1, alive: true, swingActive: false, swingFrac: 0 }; } if (t < g.mainDurFull + T_FADE) { const f = (t - g.mainDurFull) / T_FADE; return { x: g.x0 + g.trackW, y: g.mainY, opacity: 1 - f, alive: true, swingActive: false, swingFrac: 0 }; } return { x: 0, y: 0, opacity: 0, alive: false, swingActive: false, swingFrac: 0 }; } if (t < T_MAIN1) { return { x: g.x0 + g.rate * t, y: g.mainY, opacity: 1, alive: true, swingActive: false, swingFrac: 0 }; } const swingEndX = g.dx - g.arcR * 0.35; const swingEndY = g.mainY + (g.loopY - g.mainY) * 0.4; if (t < T_MAIN1 + T_SWING) { const f = (t - T_MAIN1) / T_SWING; return { x: g.dx + (swingEndX - g.dx) * f, y: g.mainY + (swingEndY - g.mainY) * f, opacity: 1, alive: true, swingActive: true, swingFrac: f, }; } if (t < T_MAIN1 + T_SWING + T_LOOP) { const f = (t - T_MAIN1 - T_SWING) / T_LOOP; const p = loopPosition(f, g, swingEndX, swingEndY); return { x: p.x, y: p.y, opacity: 1, alive: true, swingActive: false, swingFrac: 0 }; } const t3 = T_MAIN1 + T_SWING + T_LOOP; if (t < t3 + g.mainDur2) { const local = t - t3; return { x: g.rx + g.rate * local, y: g.mainY, opacity: 1, alive: true, swingActive: false, swingFrac: 0 }; } if (t < t3 + g.mainDur2 + T_FADE) { const f = (t - t3 - g.mainDur2) / T_FADE; return { x: g.x0 + g.trackW, y: g.mainY, opacity: 1 - f, alive: true, swingActive: false, swingFrac: 0 }; } return { x: 0, y: 0, opacity: 0, alive: false, swingActive: false, swingFrac: 0 }; } function loopPathD(g: Geometry): string { return [ `M${g.dx.toFixed(1)} ${g.mainY.toFixed(1)}`, `C ${g.dx.toFixed(1)} ${(g.mainY + (g.loopY - g.mainY) * 0.7).toFixed(1)}, ${g.dx.toFixed(1)} ${g.loopY.toFixed(1)}, ${(g.dx - g.arcR).toFixed(1)} ${g.loopY.toFixed(1)}`, `L ${(g.rx + g.arcR).toFixed(1)} ${g.loopY.toFixed(1)}`, `C ${g.rx.toFixed(1)} ${g.loopY.toFixed(1)}, ${g.rx.toFixed(1)} ${(g.mainY + (g.loopY - g.mainY) * 0.7).toFixed(1)}, ${g.rx.toFixed(1)} ${g.mainY.toFixed(1)}`, ].join(" "); } // Fixed reduced-motion freeze frame — named MID_KICKOUT: one tile mid // diverter-swing (still partially over the main line, already angled onto // the loop), one tile further along the loop, one ordinary tile mid main // line — normal transit, the kickout event, and loop transit in one frame. const FREEZE_SWING_T = T_MAIN1 + T_SWING * 0.5; const FREEZE_LOOP_T = T_MAIN1 + T_SWING + T_LOOP * 0.72; const FREEZE_MAIN_T = 800; export interface JamKickoutLoopProps { /** extra classes merged onto the rendered root element */ className?: string; } export function JamKickoutLoop({ className = "" }: JamKickoutLoopProps) { const rootRef = useRef(null); const pathRef = useRef(null); const lineRef = useRef(null); const armRef = useRef(null); const tileRefs = useRef<(HTMLDivElement | null)[]>([]); useEffect(() => { const root = rootRef.current; if (!root) return; const reduced = window.matchMedia("(prefers-reduced-motion: reduce)").matches; let disposed = false; let geo = computeGeometry(root.clientWidth || 1, root.clientHeight || 1); let visible = true; let raf = 0; let last = 0; let spawnAcc = 0; let spawnCounter = 0; let idSeq = 0; let items: Item[] = []; let armSwingStart = -Infinity; const applyGeometry = () => { pathRef.current?.setAttribute("d", loopPathD(geo)); lineRef.current?.setAttribute("x1", String(geo.x0)); lineRef.current?.setAttribute("x2", String(geo.x0 + geo.trackW)); lineRef.current?.setAttribute("y1", String(geo.mainY)); lineRef.current?.setAttribute("y2", String(geo.mainY)); const armLen = Math.max(10, geo.arcR * 0.9); armRef.current?.setAttribute("x1", String(geo.dx)); armRef.current?.setAttribute("y1", String(geo.mainY)); armRef.current?.setAttribute("x2", String(geo.dx + armLen)); armRef.current?.setAttribute("y2", String(geo.mainY)); }; const setTile = (el: HTMLDivElement | null, x: number, y: number, opacity: number) => { if (!el) return; el.style.transform = `translate3d(${(x - TILE_W / 2).toFixed(1)}px, ${(y - TILE_H / 2).toFixed(1)}px, 0)`; el.style.opacity = String(opacity); }; const setArm = (angleDeg: number, emphasis: number) => { const el = armRef.current; if (!el) return; el.setAttribute("transform", `rotate(${angleDeg.toFixed(2)} ${geo.dx.toFixed(1)} ${geo.mainY.toFixed(1)})`); el.style.opacity = String(0.55 + 0.45 * emphasis); }; const renderFrame = (now: number) => { let i = 0; for (; i < items.length && i < POOL_SIZE; i++) { const item = items[i]; if (!item) continue; const pose = poseAt(now - item.spawnTime, item.kicked, geo); setTile(tileRefs.current[i] ?? null, pose.x, pose.y, pose.opacity); if (item.kicked && pose.swingActive) { armSwingStart = item.spawnTime + T_MAIN1; } } for (; i < POOL_SIZE; i++) setTile(tileRefs.current[i] ?? null, geo.x0, geo.mainY, 0); // Arm: swing out over T_SWING, ease back over the following ~250ms; // resting otherwise. Driven off the most recent kick's own timeline, // not a separate clock, so it always matches the tile that triggered it. const sinceSwing = now - armSwingStart; if (sinceSwing >= 0 && sinceSwing < T_SWING) { const f = sinceSwing / T_SWING; setArm(108 * f, f); } else if (sinceSwing >= T_SWING && sinceSwing < T_SWING + 260) { const f = 1 - (sinceSwing - T_SWING) / 260; setArm(108 * f, f); } else { setArm(0, 0); } }; const loop = (now: number) => { raf = 0; if (!visible) return; if (last === 0) last = now; const dt = Math.min(100, now - last); last = now; spawnAcc += dt; while (spawnAcc >= SPAWN_MS) { spawnAcc -= SPAWN_MS; const kicked = spawnCounter % KICK_EVERY === KICK_EVERY - 1; spawnCounter += 1; items.push({ id: idSeq++, spawnTime: now - spawnAcc, kicked }); } items = items.filter((it) => poseAt(now - it.spawnTime, it.kicked, geo).alive); renderFrame(now); raf = requestAnimationFrame(loop); }; const seedResting = () => { // Populate a believable "already running" resting state instead of an // empty track on first paint: back-date a handful of spawn times. const now = performance.now(); items = []; spawnCounter = 0; const seedSpawns = [-5100, -4200, -3300, -2400, -1500, -600]; for (const offset of seedSpawns) { const kicked = spawnCounter % KICK_EVERY === KICK_EVERY - 1; spawnCounter += 1; items.push({ id: idSeq++, spawnTime: now + offset, kicked }); } items = items.filter((it) => poseAt(now - it.spawnTime, it.kicked, geo).alive); spawnAcc = 600; // next spawn due in 300ms, matching the 900ms cadence renderFrame(now); }; const renderFreezeFrame = () => { applyGeometry(); const swing = poseAt(FREEZE_SWING_T, true, geo); const loopTile = poseAt(FREEZE_LOOP_T, true, geo); const mainTile = poseAt(FREEZE_MAIN_T, false, geo); setTile(tileRefs.current[0] ?? null, swing.x, swing.y, 1); setTile(tileRefs.current[1] ?? null, loopTile.x, loopTile.y, 1); setTile(tileRefs.current[2] ?? null, mainTile.x, mainTile.y, 1); for (let i = 3; i < POOL_SIZE; i++) setTile(tileRefs.current[i] ?? null, geo.x0, geo.mainY, 0); setArm(108 * swing.swingFrac, swing.swingFrac); }; const start = () => { applyGeometry(); if (reduced) { renderFreezeFrame(); return; } seedResting(); last = 0; if (!raf) raf = requestAnimationFrame(loop); }; let resizeTimer = 0; const onResize = () => { window.clearTimeout(resizeTimer); resizeTimer = window.setTimeout(() => { if (disposed || !root) return; geo = computeGeometry(root.clientWidth || 1, root.clientHeight || 1); applyGeometry(); if (reduced) renderFreezeFrame(); }, 100); }; const ro = new ResizeObserver(onResize); ro.observe(root); const io = new IntersectionObserver((entries) => { visible = entries[0]?.isIntersecting ?? true; if (visible && !reduced && !raf) { last = 0; raf = requestAnimationFrame(loop); } }); io.observe(root); start(); return () => { disposed = true; cancelAnimationFrame(raf); raf = 0; window.clearTimeout(resizeTimer); ro.disconnect(); io.disconnect(); }; }, []); return (

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{ tileRefs.current[i] = el; }} className="absolute left-0 top-0 rounded-[1px] bg-foreground" style={{ width: TILE_W, height: TILE_H, opacity: 0, willChange: "transform" }} /> ))}

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