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The chain is a literal physical // program that loops forever, repeating (in the real machine) as long as // the loom runs. // // This deliberately does NOT render as a static hole/patch data grid (that // territory belongs to punch-patch's permissions matrix) — the load-bearing // part here is the CHAIN IN MOTION: cards continuously advance past a fixed // read gate, a needle bank ripples to the new card's pattern, holds, then // the next card slides in. Real jacquard read rates (100-1000 picks/min) // sit at or above the 60Hz paint rate, so per the round-9 legibility rule // the whole read-and-settle cycle is decoupled to one legible event every // 900ms rather than animated 1:1: a 16-needle-wide ripple resolves over // ~160ms (staggered ~4ms/needle so it reads as a wave, not a snap), holds // for the remainder of the card's dwell, then a 220ms card slide gives a // clear departure/arrival before the next read begins — never a blink. // // Card patterns are generated by a small integer hash keyed on (needle // index, card index) rather than Math.random(), so the sequence is // deterministic and never literally repeats card-to-card while staying // stable across re-renders and reduced-motion freezes. // // Card body is drawn with a low-alpha --ns-muted fill standing in for card // stock (never a --border fill — --border is used only as the thin outline // stroke and the fixed read-gate guide line, its correct use as a separator // token) with holes cut through to solid --background so the punched // pattern reads as negative space rather than an inked colour, in both // themes. Needles: extended (hole present) draws at --foreground, retracted // (no hole) at --ns-muted, a shorter, lower-contrast peg. No --ns-accent // anywhere in the mechanism — this is ambient, not interaction chrome. // --------------------------------------------------------------------------- export interface JacquardCardChainProps { /** card heading */ title?: string; /** card body copy */ description?: string; /** extra classes merged onto the rendered root element */ className?: string; /** inline styles merged onto the root element */ style?: CSSProperties; } const CARD_MS = 900; // one full card read-and-settle cycle const RIPPLE_MS = 160; // window in which the needle bank resolves to the new pattern const SLIDE_MS = 220; // card-to-card slide transition (departure + arrival) const HOLD_END_MS = CARD_MS - SLIDE_MS; // 680 — hold ends, next card's slide begins const NEEDLE_STAGGER_MS = 4; // per-needle start delay across the bank const NEEDLE_TRAVEL_MS = 100; // one needle's own travel+settle duration // Reduced motion freezes mid-hold (not mid-ripple, not mid-slide) on a card // with a roughly mixed pattern — the most structured single frame. const FREEZE_PHASE = "CARD_READ_HOLD"; const FREEZE_CARD_INDEX = 2; const FREEZE_LOCAL_T = 400; // inside the 160-680ms hold window function easeOutBack(t: number): number { const c1 = 1.70158; const c3 = c1 + 1; const x = t - 1; return 1 + c3 * x * x * x + c1 * x * x; } function easeOutCubic(t: number): number { const x = 1 - t; return 1 - x * x * x; } function clamp01(v: number): number { return v < 0 ? 0 : v > 1 ? 1 : v; } // deterministic pseudo-random bit for (needle index i, card index k) — // stable forever, never repeats identically across nearby card indices. function patternBit(i: number, k: number): 0 | 1 { let h = (i * 2654435761 + k * 40503 + 12345) >>> 0; h = Math.imul(h ^ (h >>> 15), h | 1); h ^= h + Math.imul(h ^ (h >>> 7), h | 61); h = (h ^ (h >>> 14)) >>> 0; return h % 100 < 50 ? 1 : 0; } export function JacquardCardChain({ title = "Weaving pattern", description = "A chain of punched cards feeds past a needle bank, one read every beat — the program loops forever.", className = "", style, }: JacquardCardChainProps) { const rootRef = useRef(null); const canvasRef = useRef(null); useEffect(() => { const root = rootRef.current; const canvas = canvasRef.current; if (!root || !canvas) return; const ctx = canvas.getContext("2d"); if (!ctx) return; const mq = window.matchMedia("(prefers-reduced-motion: reduce)"); let reduced = mq.matches; let bg = "#0a0a0a"; let fg = "#ededed"; let muted = "#8f8f8f"; let border = "#2e2e2e"; const deriveColors = () => { const cs = getComputedStyle(document.documentElement); bg = cs.getPropertyValue("--background").trim() || bg; fg = cs.getPropertyValue("--foreground").trim() || fg; muted = cs.getPropertyValue("--ns-muted").trim() || muted; border = cs.getPropertyValue("--border").trim() || border; }; deriveColors(); let w = 0; let h = 0; let dpr = 1; let visible = true; let raf = 0; let startAt = 0; // performance.now() at first paint of this mount const drawFrame = (elapsedMs: number) => { if (w <= 0 || h <= 0) return; // mechanism occupies the lower ~58% of the card so it never collides // with the heading/caption text stacked in the top padding above it. const visualTop = h * 0.42; const needleZoneH = h * 0.34; // vertical room the needle bank travels within const needleBaseY = visualTop + needleZoneH; // baseline needles rise from const chainTop = needleBaseY + h * 0.06; const chainH = h * 0.18; const cardH = chainH * 0.9; const readGateX = w * 0.42; const cardW = Math.max(24, w * 0.34); const needleCount = Math.max(12, Math.min(20, Math.round(cardW / 9))); const pitch = cardW / (needleCount + 1); const needleStartX = readGateX - ((needleCount - 1) * pitch) / 2; const extendedLen = needleZoneH * 0.85; const retractedLen = needleZoneH * 0.38; const cardIndex = Math.floor(elapsedMs / CARD_MS); const localT = elapsedMs - cardIndex * CARD_MS; const prevPatternIndex = cardIndex - 1; const currPatternIndex = cardIndex; const slideT = localT < HOLD_END_MS ? 0 : easeOutCubic((localT - HOLD_END_MS) / SLIDE_MS); ctx.setTransform(dpr, 0, 0, dpr, 0, 0); ctx.fillStyle = bg; ctx.fillRect(0, 0, w, h); // -- read-gate guide line: --border is a separator token, correct use -- ctx.strokeStyle = border; ctx.lineWidth = 1; ctx.beginPath(); ctx.moveTo(readGateX, needleBaseY - extendedLen - 4); ctx.lineTo(readGateX, chainTop + chainH); ctx.stroke(); // -- card chain, clipped to its lane so cards entering/leaving the // canvas edges are simply cropped by the window, no fade needed -- ctx.save(); ctx.beginPath(); ctx.rect(0, chainTop, w, chainH); ctx.clip(); for (let k = cardIndex - 1; k <= cardIndex + 2; k++) { const posUnits = k - cardIndex - slideT; const centerX = readGateX + posUnits * cardW; if (centerX < -cardW || centerX > w + cardW) continue; const left = centerX - cardW / 2 + 2; const right = centerX + cardW / 2 - 2; const top = chainTop + (chainH - cardH) / 2; ctx.globalAlpha = 0.35; ctx.fillStyle = muted; ctx.fillRect(left, top, right - left, cardH); ctx.globalAlpha = 1; ctx.strokeStyle = border; ctx.lineWidth = 1; ctx.strokeRect(left + 0.5, top + 0.5, right - left - 1, cardH - 1); const holeR = Math.max(1.5, pitch * 0.26); for (let i = 0; i < needleCount; i++) { if (patternBit(i, k) !== 1) continue; const hx = needleStartX + i * pitch; if (hx < left + holeR || hx > right - holeR) continue; ctx.beginPath(); ctx.fillStyle = bg; ctx.arc(hx, top + cardH / 2, holeR, 0, Math.PI * 2); ctx.fill(); } } ctx.restore(); // -- needle bank: ripple from the previous card's pattern to the // current one, staggered per needle, then hold -- for (let i = 0; i < needleCount; i++) { const startDelay = i * NEEDLE_STAGGER_MS; const needleLocalT = localT - startDelay; let progress: number; if (needleLocalT <= 0) progress = 0; else if (needleLocalT >= NEEDLE_TRAVEL_MS) progress = 1; else progress = easeOutBack(clamp01(needleLocalT / NEEDLE_TRAVEL_MS)); const prevBit = patternBit(i, prevPatternIndex); const currBit = patternBit(i, currPatternIndex); const prevLen = prevBit === 1 ? extendedLen : retractedLen; const currLen = currBit === 1 ? extendedLen : retractedLen; const len = prevLen + (currLen - prevLen) * clamp01(progress); const extended = len > (extendedLen + retractedLen) / 2; const nx = needleStartX + i * pitch; ctx.strokeStyle = extended ? fg : muted; ctx.lineWidth = extended ? 2 : 1.5; ctx.beginPath(); ctx.moveTo(nx, needleBaseY); ctx.lineTo(nx, needleBaseY - Math.max(retractedLen * 0.6, len)); ctx.stroke(); } }; const loop = (now: number) => { if (startAt === 0) startAt = now; drawFrame(now - startAt); if (!reduced && visible) raf = requestAnimationFrame(loop); else raf = 0; }; const wake = () => { if (raf === 0 && !reduced && visible) raf = requestAnimationFrame(loop); }; const resize = () => { const rect = root.getBoundingClientRect(); w = rect.width; h = rect.height; if (w < 2 || h < 2) return; dpr = Math.min(2, window.devicePixelRatio || 1); canvas.width = Math.max(1, Math.round(w * dpr)); canvas.height = Math.max(1, Math.round(h * dpr)); if (reduced) { drawFrame(FREEZE_CARD_INDEX * CARD_MS + FREEZE_LOCAL_T); } else { drawFrame(startAt === 0 ? 0 : performance.now() - startAt); } }; resize(); if (!reduced) wake(); const ro = new ResizeObserver(resize); ro.observe(root); const io = new IntersectionObserver((entries) => { visible = entries[0]?.isIntersecting ?? true; if (visible) wake(); else if (raf) { cancelAnimationFrame(raf); raf = 0; } }); io.observe(root); const mo = new MutationObserver(() => { deriveColors(); if (reduced) drawFrame(FREEZE_CARD_INDEX * CARD_MS + FREEZE_LOCAL_T); else drawFrame(startAt === 0 ? 0 : performance.now() - startAt); }); mo.observe(document.documentElement, { attributes: true, attributeFilter: ["class"] }); const onReducedChange = () => { reduced = mq.matches; if (reduced) { cancelAnimationFrame(raf); raf = 0; drawFrame(FREEZE_CARD_INDEX * CARD_MS + FREEZE_LOCAL_T); } else { startAt = 0; wake(); } }; mq.addEventListener("change", onReducedChange); const onVisibility = () => { if (document.visibilityState === "visible") wake(); else if (raf) { cancelAnimationFrame(raf); raf = 0; } }; document.addEventListener("visibilitychange", onVisibility); return () => { cancelAnimationFrame(raf); raf = 0; ro.disconnect(); io.disconnect(); mo.disconnect(); mq.removeEventListener("change", onReducedChange); document.removeEventListener("visibilitychange", onVisibility); }; }, []); return (

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