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The read event // (round 9's jacquard-card-chain territory — a needle bank resolving a // punched pattern) is deliberately absent here: nothing is "read" on // screen, there is no bank of needles or pips, and the visible subject is // entirely the routing mechanism — the gate's decisive swing and the // pockets filling unevenly over time, never a card being decoded. // // ROUTING. Pocket assignment cycles a fixed period-17 sequence (never a // runtime Math.random pick) weighted so the center pocket receives roughly // 2x an outer pocket's share — uneven fill is part of what reads "alive". // The sequence is long enough that it doesn't visibly repeat within a // short viewing window (17 cards * 1.1s feed ~= 18.7s per full cycle). // // TIMING. One card feeds every 1.1s. A card's full journey — 300ms // straight drop to the gate, then 380ms ease-in-out gate-swing + curve // into its pocket — takes 680ms, safely inside the 1.1s feed interval, so // exactly one card is ever mid-journey at a time and a viewer can follow // one card start-to-finish without a second card's motion overlapping it. // The gate flap itself swings in the same 380ms window and eases back to // its neutral heading between cards, so the mechanism reads as "deciding" // rather than merely decorating the card's own motion. // // POCKETS. Each pocket holds a rolling window of 14 visible cards, newest // on top; a 15th arrival fades the bottom (oldest) card out over 260ms as // the new one lands — a continuous rolling loop with no visible restart. // Stack rise is 3px/card, capped so the tallest pocket never exceeds 70% // of the bin's height (older cards compress toward that cap rather than // spilling out of the bin). // // TOKENS. Card fill is --background, card outline --foreground at 60% // opacity (color-mix, no literal). Pocket bin outlines are --border — a // separator, never a fill. Stacked cards inside a pocket step from 25% to // 55% --foreground mixed into --background, oldest to newest, so pocket // depth reads as a value gradient. No --ns-accent anywhere: the gate's // heading is conveyed purely by its swing angle and the card's curved // path, never by a color cue. All colors are CSS custom properties // referenced directly (var(...) / color-mix(...)) — nothing is read via // getComputedStyle because nothing here needs a numeric color value, only // a token reference the browser resolves itself. // --------------------------------------------------------------------------- import { useEffect, useId, useMemo, useRef, useState } from "react"; const POCKET_COUNT = 5; // period-17 pseudo-random routing sequence, center pocket (index 2) weighted // roughly 2x an outer pocket's share (6 hits vs ~3 each for the outer four) const ROUTE_PATTERN = [2, 0, 3, 2, 4, 1, 2, 0, 3, 2, 1, 4, 2, 0, 3, 1, 2] as const; const GATE_ANGLES = [-60, -30, 0, 30, 60] as const; // deg, pocket 0..4 const FEED_MS = 1100; const DROP_MS = 300; const ROUTE_MS = 380; const POCKET_CAPACITY = 14; const FADE_MS = 260; const RISE_PX = 3; const MAX_RISE_FRAC = 0.7; // of bin height const ROUTE_EASE = "cubic-bezier(0.4, 0, 0.2, 1)"; // ease-in-out interface FlightCard { id: number; pocket: number; phase: "drop" | "route"; } interface LandedCard { id: number; removing: boolean; } export interface SorterPocketRouteProps { /** text announced via the component's own aria-live region */ label?: string; /** freeze on the reduced-motion tableau regardless of the OS setting */ paused?: boolean; /** extra classes merged onto the rendered root element */ className?: string; style?: React.CSSProperties; } function useReducedMotion() { const [reduced, setReduced] = useState(false); useEffect(() => { const mq = window.matchMedia("(prefers-reduced-motion: reduce)"); setReduced(mq.matches); const onChange = () => setReduced(mq.matches); mq.addEventListener("change", onChange); return () => mq.removeEventListener("change", onChange); }, []); return reduced; } // hand-authored STATIC_PHASE: one card frozen mid-chute at the 60%-through // point of its gate-swing (its translate sits between the vertical drop // line and its pocket's horizontal offset, so it reads angled, neither // vertical nor horizontal), and five pockets showing a distinctly uneven // fill — never all-empty, never all-equal. const STATIC_POCKET_COUNTS = [4, 9, 3, 11, 6]; const STATIC_FROZEN_POCKET = 4; const STATIC_PROGRESS = 0.6; export function SorterPocketRoute({ label = "Sorting", paused = false, className = "", style, }: SorterPocketRouteProps) { const uid = useId(); const reducedMotion = useReducedMotion(); const frozen = reducedMotion || paused; const rootRef = useRef(null); const [size, setSize] = useState({ w: 320, h: 220 }); const [pockets, setPockets] = useState(() => Array.from({ length: POCKET_COUNT }, () => []), ); const [flight, setFlight] = useState(null); const [gatePocket, setGatePocket] = useState(null); const nextIdRef = useRef(0); const routeCountRef = useRef(0); const timersRef = useRef>>(new Set()); const addTimer = (fn: () => void, ms: number) => { const id = setTimeout(() => { timersRef.current.delete(id); fn(); }, ms); timersRef.current.add(id); return id; }; const clearAllTimers = () => { timersRef.current.forEach((id) => clearTimeout(id)); timersRef.current.clear(); }; useEffect(() => { const root = rootRef.current; if (!root) return; const ro = new ResizeObserver((entries) => { const rect = entries[0]?.contentRect; if (!rect || rect.width < 2 || rect.height < 2) return; setSize({ w: rect.width, h: rect.height }); }); ro.observe(root); return () => ro.disconnect(); }, []); useEffect(() => { if (frozen) { clearAllTimers(); setFlight(null); setGatePocket(null); return; } const spawn = () => { const pocket = ROUTE_PATTERN[routeCountRef.current % ROUTE_PATTERN.length]!; routeCountRef.current += 1; const id = nextIdRef.current++; setFlight({ id, pocket, phase: "drop" }); addTimer(() => { setFlight((f) => (f && f.id === id ? { ...f, phase: "route" } : f)); setGatePocket(pocket); }, DROP_MS); addTimer(() => { setFlight((f) => (f && f.id === id ? null : f)); setGatePocket((p) => (p === pocket ? null : p)); setPockets((prev) => { const next = prev.map((bin) => bin.slice()); next[pocket]!.push({ id, removing: false }); if (next[pocket]!.length > POCKET_CAPACITY) { const oldest = next[pocket]![0]!; oldest.removing = true; const oldestId = oldest.id; addTimer(() => { setPockets((p2) => { const n2 = p2.map((bin) => bin.slice()); n2[pocket] = n2[pocket]!.filter((c) => c.id !== oldestId); return n2; }); }, FADE_MS); } return next; }); }, DROP_MS + ROUTE_MS); }; // first card feeds immediately so the loader isn't empty at mount spawn(); const interval = setInterval(spawn, FEED_MS); return () => { clearInterval(interval); clearAllTimers(); }; // eslint-disable-next-line react-hooks/exhaustive-deps }, [frozen]); useEffect(() => clearAllTimers, []); // ------------------------------------------------------------------- // geometry — pocket width from container width (leaves a gutter), card // height derived from pocket width, so the whole assembly compresses // together at narrow container widths rather than any piece clipping. // ------------------------------------------------------------------- const geo = useMemo(() => { const w = size.w; const h = size.h; const pocketW = w / 5.5; const cardH = pocketW * 0.4; const cardW = pocketW * 0.72; const gutter = POCKET_COUNT > 1 ? (w - POCKET_COUNT * pocketW) / (POCKET_COUNT - 1) : 0; const pocketLeft = (i: number) => i * (pocketW + gutter); const pocketCenterX = (i: number) => pocketLeft(i) + pocketW / 2; const trackX = w / 2; const gateY = h * 0.32; const binTop = h * 0.4; const binHeight = h * 0.58; const binBottom = binTop + binHeight; const rise = Math.min(RISE_PX, (binHeight * MAX_RISE_FRAC) / POCKET_CAPACITY); return { w, h, pocketW, cardH, cardW, pocketLeft, pocketCenterX, trackX, gateY, binTop, binHeight, binBottom, rise }; }, [size]); const landY = (pocket: number, indexFromBottom: number) => geo.binBottom - geo.cardH / 2 - indexFromBottom * geo.rise; const flightStyle = (): React.CSSProperties | null => { if (!flight) return null; const startX = geo.trackX; const startY = geo.cardH / 2; if (flight.phase === "drop") { return { left: startX - geo.cardW / 2, top: 0, width: geo.cardW, height: geo.cardH, transform: `translateY(${geo.gateY - geo.cardH / 2}px) rotate(0deg)`, transition: `transform ${DROP_MS}ms linear`, }; } const targetX = geo.pocketCenterX(flight.pocket); const targetY = landY(flight.pocket, pockets[flight.pocket]?.length ?? 0); return { left: startX - geo.cardW / 2, top: 0, width: geo.cardW, height: geo.cardH, transform: `translate(${targetX - startX}px, ${targetY}px) rotate(-6deg)`, transition: `transform ${ROUTE_MS}ms ${ROUTE_EASE}`, }; }; const frozenFlightStyle = (): React.CSSProperties => { const startX = geo.trackX; const targetX = geo.pocketCenterX(STATIC_FROZEN_POCKET); const targetY = landY(STATIC_FROZEN_POCKET, STATIC_POCKET_COUNTS[STATIC_FROZEN_POCKET]!); const t = STATIC_PROGRESS; return { left: startX - geo.cardW / 2, top: 0, width: geo.cardW, height: geo.cardH, transform: `translate(${(targetX - startX) * t}px, ${geo.gateY - geo.cardH / 2 + (targetY - (geo.gateY - geo.cardH / 2)) * t}px) rotate(${-6 * t}deg)`, }; }; const gateAngle = frozen ? GATE_ANGLES[STATIC_FROZEN_POCKET]! * STATIC_PROGRESS : gatePocket === null ? 0 : GATE_ANGLES[gatePocket]!; const activePockets: LandedCard[][] = frozen ? STATIC_POCKET_COUNTS.map((n) => Array.from({ length: n }, (_, i) => ({ id: i, removing: false })), ) : pockets; return (

{label}

{/* gate + flap — the mechanism, not the card, is the decision-maker */}

{/* flying card */} {frozen ? (

) : ( flight && (

) )} {/* pockets row */}

{Array.from({ length: POCKET_COUNT }).map((_, p) => (

{activePockets[p]!.map((card, i) => { const pct = 25 + (30 * i) / Math.max(1, POCKET_CAPACITY - 1); return (

); })}

))}

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