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The mechanic is a // real airlift pump (mining dewatering, geothermal lift, aquarium airlift): // compressed air injected at the foot of a submerged riser forms discrete gas // slugs, and each slug's buoyant rise drags the plug of liquid immediately // ahead of it up the pipe — classic two-phase "slug flow", delivery arriving // in distinct pulses rather than a continuous stream. // // A new slug/plug pair is injected at the rail's foot every 1.8s (inside the // real 0.5-3Hz small-riser slugging band) and rises at a constant 140px/s // (buoyancy-driven rise is near-constant, not accelerating). The slug is a // rounded capsule at reduced --foreground opacity (the bubble read); the // liquid plug it drags is a solid --foreground band riding flush against the // slug's leading edge, same speed — two coupled parts, never one blob. On // reaching the rail's head the pair fades over 220ms and deposits into a // small accumulator basin, whose fill increments 1/14th per arrival and // wraps every 14 arrivals (~25s self-contained macro-cycle). // // Everything is driven off a virtual clock that only advances while the rail // is on-screen (an IntersectionObserver pauses/resumes it), so a tab-away // never produces a catch-up burst on return. Geometry is recomputed from a // ResizeObserver reading the container's own box — no restart on resize, the // running pairs simply reflow onto the new rail height next frame. // --------------------------------------------------------------------------- const INJECT_INTERVAL_MS = 1800; // slug injection period — real 0.5-3Hz small-riser band const RISE_SPEED_PX_S = 140; // constant buoyancy-driven rise speed const SLUG_HEIGHT_FRAC = 0.09; // slug capsule height, fraction of rail height const PLUG_HEIGHT_FRAC = 0.14; // dragged liquid plug height, fraction of rail height const FADE_MS = 220; // arrival fade-out, slug+plug together const BASIN_STEPS = 14; // arrivals per full basin cycle (~25s macro-cycle) const RAIL_WIDTH_FRAC = 0.08; // rail width = 8% of the container's smaller dimension const RAIL_WIDTH_MIN = 5; const RAIL_WIDTH_MAX = 22; const BASIN_SIZE_MULT = 2.4; // basin side length = rail width * this const BASIN_GAP = 3; // px gap between rail head and basin const REDUCED_BASIN_FRAC = 5 / BASIN_STEPS; // frozen-frame basin level — mid-cycle, not 0 or full interface Pair { slug: HTMLDivElement; plug: HTMLDivElement; injectedAtV: number; // virtual ms timestamp at injection fading: boolean; fadeStartV: number; } export interface AirliftSlugFlowProps { /** fired once per slug arrival at the basin — hook a real file row's status pulse to it */ onSlugArrival?: () => void; /** extra classes merged onto the root element */ className?: string; } export function AirliftSlugFlow({ onSlugArrival, className = "" }: AirliftSlugFlowProps) { const rootRef = useRef(null); const railRef = useRef(null); const columnRef = useRef(null); const layerRef = useRef(null); const basinRef = useRef(null); const basinFillRef = useRef(null); const onArrivalRef = useRef(onSlugArrival); onArrivalRef.current = onSlugArrival; useEffect(() => { const root = rootRef.current; const rail = railRef.current; const column = columnRef.current; const layer = layerRef.current; const basin = basinRef.current; const basinFill = basinFillRef.current; if (!root || !rail || !column || !layer || !basin || !basinFill) return; let disposed = false; let railWidthPx = 0; let railHeightPx = 0; let visible = true; let raf = 0; let last = 0; let vClock = 0; let injectAcc = 0; let arrivalCount = 0; let pairs: Pair[] = []; const mq = window.matchMedia("(prefers-reduced-motion: reduce)"); const layoutBasin = () => { const size = Math.min(RAIL_WIDTH_MAX * BASIN_SIZE_MULT, Math.max(RAIL_WIDTH_MIN * BASIN_SIZE_MULT, railWidthPx * BASIN_SIZE_MULT)); basin.style.width = `${size}px`; basin.style.height = `${size}px`; basin.style.marginBottom = `${BASIN_GAP}px`; }; const setBasinFrac = (frac: number) => { basinFill.style.height = `${Math.max(0, Math.min(1, frac)) * 100}%`; }; const spawnPair = (injectedAtV: number) => { const slug = document.createElement("div"); slug.className = "asf-slug"; const plug = document.createElement("div"); plug.className = "asf-plug"; layer.appendChild(plug); layer.appendChild(slug); pairs.push({ slug, plug, injectedAtV, fading: false, fadeStartV: 0 }); }; const removePair = (p: Pair) => { p.slug.remove(); p.plug.remove(); }; const arrive = () => { arrivalCount = (arrivalCount % BASIN_STEPS) + 1; setBasinFrac(arrivalCount / BASIN_STEPS); onArrivalRef.current?.(); }; const applyPairStyle = (p: Pair, elapsedV: number) => { const slugH = railHeightPx * SLUG_HEIGHT_FRAC; const plugH = railHeightPx * PLUG_HEIGHT_FRAC; const y = (elapsedV / 1000) * RISE_SPEED_PX_S; const slugTop = y + slugH; const pairTop = slugTop + plugH; if (!p.fading && pairTop >= railHeightPx) { p.fading = true; p.fadeStartV = elapsedV; p.slug.style.transition = `opacity ${FADE_MS}ms linear`; p.plug.style.transition = `opacity ${FADE_MS}ms linear`; p.slug.style.opacity = "0"; p.plug.style.opacity = "0"; arrive(); } p.slug.style.height = `${slugH}px`; p.slug.style.bottom = `${Math.min(y, railHeightPx - slugH)}px`; p.plug.style.height = `${plugH}px`; p.plug.style.bottom = `${Math.min(slugTop, railHeightPx - 0)}px`; }; const layoutFrozenFrame = () => { const slugH = railHeightPx * SLUG_HEIGHT_FRAC; const plugH = railHeightPx * PLUG_HEIGHT_FRAC; const pairH = slugH + plugH; const bottom = railHeightPx * 0.5 - pairH / 2; layer.innerHTML = ""; const slug = document.createElement("div"); slug.className = "asf-slug"; slug.style.height = `${slugH}px`; slug.style.bottom = `${bottom}px`; const plug = document.createElement("div"); plug.className = "asf-plug"; plug.style.height = `${plugH}px`; plug.style.bottom = `${bottom + slugH}px`; layer.appendChild(plug); layer.appendChild(slug); setBasinFrac(REDUCED_BASIN_FRAC); }; const measure = () => { const rect = root.getBoundingClientRect(); const minDim = Math.min(rect.width, rect.height); railWidthPx = Math.max(RAIL_WIDTH_MIN, Math.min(RAIL_WIDTH_MAX, minDim * RAIL_WIDTH_FRAC)); column.style.width = `${railWidthPx}px`; rail.style.width = `${railWidthPx}px`; layoutBasin(); const basinRect = basin.getBoundingClientRect(); railHeightPx = Math.max(0, rect.height - basinRect.height - BASIN_GAP); rail.style.height = `${railHeightPx}px`; if (mq.matches) layoutFrozenFrame(); }; const loop = (now: number) => { raf = 0; if (disposed) return; if (!visible || railHeightPx <= 0) { raf = requestAnimationFrame(loop); return; } if (last === 0) last = now; const dt = Math.min(100, now - last); last = now; vClock += dt; injectAcc += dt; while (injectAcc >= INJECT_INTERVAL_MS) { injectAcc -= INJECT_INTERVAL_MS; spawnPair(vClock); } pairs = pairs.filter((p) => { const elapsedV = vClock - p.injectedAtV; applyPairStyle(p, elapsedV); if (p.fading && vClock - p.fadeStartV >= FADE_MS) { removePair(p); return false; } return true; }); raf = requestAnimationFrame(loop); }; const start = () => { measure(); if (mq.matches) return; // reduced motion: one static frame, no loop last = 0; if (!raf) raf = requestAnimationFrame(loop); }; const onReducedChange = () => { cancelAnimationFrame(raf); raf = 0; layer.innerHTML = ""; pairs = []; injectAcc = 0; vClock = 0; last = 0; arrivalCount = 0; setBasinFrac(0); start(); }; mq.addEventListener("change", onReducedChange); let resizeTimer = 0; const ro = new ResizeObserver(() => { window.clearTimeout(resizeTimer); resizeTimer = window.setTimeout(() => { if (disposed) return; measure(); }, 100); }); ro.observe(root); const io = new IntersectionObserver((entries) => { visible = entries[0]?.isIntersecting ?? true; if (visible && !mq.matches && !raf) { last = 0; raf = requestAnimationFrame(loop); } }); io.observe(root); document.fonts.ready.then(() => { if (!disposed) measure(); }); start(); return () => { disposed = true; cancelAnimationFrame(raf); raf = 0; window.clearTimeout(resizeTimer); mq.removeEventListener("change", onReducedChange); ro.disconnect(); io.disconnect(); }; // eslint-disable-next-line react-hooks/exhaustive-deps }, []); return (

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