{ "$schema": "https://ui.shadcn.com/schema/registry-item.json", "name": "noise-gate", "type": "registry:ui", "title": "Noise Gate", "description": "A before-and-after section. Alerts, pings and complaints drift into the seam between two panels and slide under the calm one, and each card that goes through lights the seam and ticks a counter, or lands as a tidy line in a log.", "author": "KeyframeUI ", "categories": [ "section", "comparison", "counter", "marketing" ], "docs": "Live preview, examples and props: https://keyframeui.com/components/noise-gate", "dependencies": [ "motion", "clsx", "tailwind-merge" ], "registryDependencies": [ "utils" ], "files": [ { "path": "components/ui/noise-gate.tsx", "type": "registry:ui", "content": "\"use client\";\n\nimport * as React from \"react\";\nimport {\n AnimatePresence,\n animate,\n motion,\n useReducedMotion,\n} from \"motion/react\";\n\nimport { cn } from \"@/lib/utils\";\n\n/**\n * Keep:\n * - One rAF loop moves every card by writing `transform` and `opacity` straight to the DOM and\n * redraws the traces; the stream never re-renders, and the loop sleeps when stopped or off\n * screen.\n * - Arrivals are scheduled: each new card starts where it reaches the seam about one beat after\n * the card before it, give or take the jitter, so ticks keep a rhythm instead of bunching.\n * - Hover and `paused` ease the whole stream to a stop through one shared factor, never a snap,\n * and the card under the pointer comes forward on top of the rest.\n * - Digits are keyed from the right and roll in `popLayout`, so a new leading digit doesn't re-roll\n * the rest; the count reads from an `sr-only` span while the moving parts are `aria-hidden`.\n * - Reduced motion shows a seeded, still scatter of cards and traces: no stream and no ticks.\n */\nconst TIMING = {\n /** A mid-depth card crossing the noise panel, in seconds (the `duration` prop). */\n duration: 15,\n /** How fast far, mid and near cards drift, as multiples of a mid-depth card's pace. */\n depthSpeed: [0.72, 1, 1.28],\n /** The stream easing to a stop and starting again, a time constant in seconds (the `settle` prop). */\n settle: 0.32,\n /** A new card appearing, in seconds. */\n fadeIn: 0.9,\n /** Between the first cards appearing, in seconds. */\n stagger: 0.11,\n /** A hovered card coming forward, as a time constant in seconds. */\n emphasis: 0.12,\n /** The least a new card drifts before it reaches the seam, in seconds. */\n minRun: 2.2,\n /** Between arrivals: this share of a full crossing, split between the cards. */\n beat: 0.9,\n /** The shortest beat, in seconds. */\n minBeat: 0.35,\n /** ± share of a beat each arrival moves by, so ticks don't land like a metronome. */\n jitter: 0.4,\n /** One bob of a card across its lane: the shortest period in seconds, and up to this many more. */\n bobPeriod: 5,\n bobVary: 3,\n /** Each trace's three waves moving, in rad/s. */\n traceSpeed: [\n [1.1, -1.9, 3.3],\n [-0.8, 2.4, -3.9],\n [1.6, -2.8, 4.6],\n ],\n /** The seam lighting up where a card went through: seconds, keyframe times and curve. */\n flash: { duration: 0.9, times: [0, 0.14, 1], ease: \"easeOut\" },\n /** The routed dot running along the seam and the horizon, in px/s. */\n route: 460,\n /** The shortest and longest the routed dot takes, in seconds. */\n routeDuration: [0.4, 1.1],\n /** The routed dot speeding up down the seam and easing out along the horizon, per leg. */\n routeEase: [\"easeIn\", \"easeOut\"],\n /** From the edge light to the tick when stacked, in seconds. */\n tickDelay: 0.42,\n /** The pill brightening once on a tick: seconds, keyframe times and curve. */\n glow: { duration: 0.9, times: [0, 0.15, 1], ease: \"easeOut\" },\n /** The fainter dot leaving on the far side: this many times as long as the routed dot would take. */\n exitPace: 1.6,\n /** The shortest and longest the fainter dot takes, in seconds. */\n exitDuration: [0.4, 1.2],\n /** The fainter dot's curve, as a motion easing. */\n exitEase: \"easeOut\",\n /** A tick with no fainter dot lingers this long before it's cleared, in seconds. */\n linger: 0.6,\n /** The counter's changed digits rolling in, in seconds (the `rollDuration` prop). */\n rollDuration: 0.42,\n /** Counter digits, as a spring over `rollDuration`. */\n roll: { type: \"spring\", bounce: 0 },\n /** Log rows sliding, as a spring. */\n row: { type: \"spring\", visualDuration: 0.45, bounce: 0 },\n} as const;\n\n/* ─────────────────────────────────────────────────────────\n * NOISE GATE STORYBOARD\n *\n * enter cards fade in one after another across the noise\n * panel, at three depths: far ones small, faint and\n * slow, near ones crisp and quicker\n * drift every card heads for the seam on its own beat,\n * bobbing a few px across its lane. Near cards pass\n * over far ones\n * gate a card's leading edge touches the seam: the calm\n * panel's edge lights up along it, and the card slides\n * on under the calm panel and is gone. A new card\n * fades in somewhere behind\n * route a dot runs along the seam to the horizon and turns\n * into the counter (or the log)\n * tick the counter's changed digits roll up and the pill\n * brightens once; in the log, the card's resolved line\n * slides in on top. A fainter dot leaves on the far side\n * traces behind the cards three jittery traces converge on\n * the horizon at the seam, where the calm side's single\n * dotted line takes over\n * hover pointing at the noise eases everything to a stop so\n * a card can be read; the card under the pointer comes\n * forward at full strength\n * stacked under 40rem the panels stack: cards fall into the\n * calm panel's top edge, which lights up, and the tick\n * follows without the routed dot\n * reduced a still scatter of cards and traces; nothing ticks\n * ───────────────────────────────────────────────────────── */\n\nconst GATE = {\n // far, mid, near\n depths: [\n { scale: 0.86, opacity: 0.38 },\n { scale: 0.94, opacity: 0.72 },\n { scale: 1, opacity: 1 },\n ],\n depthOrder: [2, 0, 1, 2, 1, 0, 2, 1, 0],\n horizon: 0.6, // share of the panel's height the horizon sits at, side by side\n overhang: 0.45, // share of a card that may start past the far edge (under the title, stacked)\n edge: 16, // px cards keep from the panel's outer edges\n crowd: 0.95, // cards on screen per card-sized area of the field\n logRows: 6,\n} as const;\n\n// Three traces, each a sum of three waves: wavenumber (rad/px). Their speeds are `TIMING.traceSpeed`.\nconst TRACES = [\n { amp: 1, k: [0.034, 0.092, 0.21], phase: 0.3, tone: \"text-rose-500/30 dark:text-rose-400/25\" },\n { amp: 0.74, k: [0.05, 0.13, 0.27], phase: 2.1, tone: \"text-amber-500/35 dark:text-amber-400/25\" },\n { amp: 0.56, k: [0.028, 0.16, 0.33], phase: 4.4, tone: \"text-zinc-400/55 dark:text-zinc-500/55\" },\n] as const;\n\nconst TONE = {\n critical: {\n tag: \"bg-rose-500/10 text-rose-700 dark:bg-rose-400/15 dark:text-rose-300\",\n icon: \"text-rose-500 dark:text-rose-400\",\n },\n warning: {\n tag: \"bg-amber-500/15 text-amber-800 dark:bg-amber-400/15 dark:text-amber-200\",\n icon: \"text-amber-500 dark:text-amber-400\",\n },\n neutral: {\n tag: \"bg-zinc-950/[0.06] text-zinc-600 dark:bg-white/10 dark:text-zinc-300\",\n icon: \"text-zinc-400 dark:text-zinc-500\",\n },\n} as const;\n\nconst SURFACE =\n \"rounded-xl border border-zinc-950/[0.08] bg-white/85 shadow-[0_1px_2px_rgb(9_9_11/0.05),0_12px_28px_-16px_rgb(9_9_11/0.3)] dark:border-white/10 dark:bg-zinc-900/85 dark:shadow-[0_1px_2px_rgb(0_0_0/0.4),0_12px_28px_-16px_rgb(0_0_0/0.8)]\";\n\nconst DOTTED: React.CSSProperties = {\n backgroundImage: \"radial-gradient(circle, currentColor 1px, transparent 1.3px)\",\n backgroundSize: \"7px 3px\",\n backgroundRepeat: \"repeat-x\",\n};\n\nconst TAU = Math.PI * 2;\nconst clamp = (v: number, lo: number, hi: number) => Math.min(hi, Math.max(lo, v));\nconst lerp = (a: number, b: number, t: number) => a + (b - a) * t;\nconst smoothstep = (a: number, b: number, v: number) => {\n const t = clamp((v - a) / (b - a), 0, 1);\n return t * t * (3 - 2 * t);\n};\nconst easeOut = (t: number) => 1 - (1 - t) ** 3;\n\n/** Small seeded generator, so the still scatter is the same on every visit. */\nfunction seeded(seed: number) {\n let a = seed >>> 0;\n return () => {\n a = (a + 0x6d2b79f5) >>> 0;\n let t = a;\n t = Math.imul(t ^ (t >>> 15), t | 1);\n t ^= t + Math.imul(t ^ (t >>> 7), t | 61);\n return ((t ^ (t >>> 14)) >>> 0) / 4294967296;\n };\n}\n\nexport type NoiseGateTone = \"critical\" | \"warning\" | \"neutral\";\n\nexport interface NoiseGateItem {\n /** The card's main line. */\n title: React.ReactNode;\n /** A smaller, muted second line. */\n detail?: React.ReactNode;\n /** A short label in a pill before the title, e.g. \"P1\" or \"Overdue\". */\n tag?: React.ReactNode;\n /** Colors the tag and the icon. */\n tone?: NoiseGateTone;\n /** A leading icon or avatar, about 20px. */\n icon?: React.ReactNode;\n /** Set the title in monospace, for log lines, file names and codes. */\n mono?: boolean;\n /** Stack this many copies, like an alert that keeps firing. */\n repeat?: number;\n /** How much the counter goes up when this card reaches the gate. */\n weight?: number;\n /** With `display=\"log\"`: the line this card becomes once it's through. */\n resolved?: React.ReactNode;\n /** With `display=\"log\"`: a right-aligned value beside `resolved`, in tabular figures. */\n resolvedDetail?: React.ReactNode;\n}\n\nexport interface NoiseGateProps {\n /** The cards that drift into the gate, cycled in order. */\n items: NoiseGateItem[];\n /** Heading of the noise side. */\n noiseTitle: React.ReactNode;\n /** Heading of the calm side. */\n calmTitle: React.ReactNode;\n /** What the calm side shows: a counter pill, or a log of resolved lines. */\n display?: \"count\" | \"log\";\n /** The counter's starting value. Each card adds its `weight` (1) when it reaches the gate. */\n count?: number;\n /** Text before the number in the pill. */\n countPrefix?: React.ReactNode;\n /** Text after the number in the pill. */\n countSuffix?: React.ReactNode;\n /** Pinned to the bottom of the calm side: a call to action or a footnote. */\n calmFooter?: React.ReactNode;\n /** Most cards on screen at once. Fewer show when the panel is small. */\n density?: number;\n /** Seconds a mid-depth card takes to cross the noise panel. */\n duration?: number;\n /** How far each card floats across its lane as it drifts, in px. */\n bob?: number;\n /** How quickly the stream eases to a stop under the pointer and gets going again: a time constant in seconds. */\n settle?: number;\n /** Seconds the counter's changed digits take to roll in. */\n rollDuration?: number;\n /** Ease the stream to a stop. It also stops while the pointer is over the noise. */\n paused?: boolean;\n /** Element for both headings. */\n titleAs?: \"h2\" | \"h3\" | \"h4\" | \"p\";\n /** Height while the panels sit side by side. Stacked, each panel sizes itself. */\n height?: string;\n /** Classes for the root. Set `[--noise-gate-radius:…]` to change the corner radius. */\n className?: string;\n /** Classes for the noise panel. */\n noiseClassName?: string;\n /** Classes for the calm panel: its background and text color. */\n calmClassName?: string;\n}\n\ntype Slot = {\n item: number;\n depth: number;\n /** px along the drift, from the far edge toward the seam (the box's start). */\n a: number;\n /** px across the drift (the box's start). */\n c: number;\n /** Stream seconds the card was born at; it fades in from there. */\n born: number;\n phase: number;\n period: number;\n gated: boolean;\n /** 0..1, how far the card has come forward under the pointer. */\n emph: number;\n};\n\ntype Geometry = {\n stacked: boolean;\n w: number;\n h: number;\n /** Along coordinate of the seam. */\n gate: number;\n /** Along coordinate where cards may start. */\n start: number;\n /** Cross range for a card's box. */\n lo: number;\n hi: number;\n horizon: number;\n /** Per item: along and cross size. */\n sizes: { a: number; c: number }[];\n};\n\ntype GateEvent = { item: number; from: number; to: number; stacked: boolean };\ntype CalmApi = { gate: (event: GateEvent) => void };\n\ntype Pulse = {\n id: number;\n item: number;\n weight: number;\n stacked: boolean;\n from: number;\n to: number;\n route: { x: number[]; y: number[]; times: number[]; duration: number } | null;\n exit: { x0: number; x1: number; y: number } | null;\n};\n\nexport function NoiseGate({\n items,\n noiseTitle,\n calmTitle,\n display = \"count\",\n count = 0,\n countPrefix,\n countSuffix,\n calmFooter,\n density = 9,\n duration = TIMING.duration,\n bob = 3,\n settle = TIMING.settle,\n rollDuration = TIMING.rollDuration,\n paused = false,\n titleAs = \"h3\",\n height = \"28rem\",\n className,\n noiseClassName,\n calmClassName,\n}: NoiseGateProps) {\n const reduced = useReducedMotion() ?? false;\n const noiseRef = React.useRef(null);\n const calmRef = React.useRef(null);\n const titleRef = React.useRef(null);\n const layerRef = React.useRef(null);\n const cardRefs = React.useRef<(HTMLDivElement | null)[]>([]);\n const traceRefs = React.useRef<(SVGPathElement | null)[]>([]);\n const calmApi = React.useRef(null);\n\n const hovering = React.useRef(false);\n const hovered = React.useRef(-1);\n const pausedRef = React.useRef(paused);\n const feel = React.useRef({ bob, settle });\n const wake = React.useRef<() => void>(() => {});\n\n React.useEffect(() => {\n pausedRef.current = paused;\n wake.current();\n }, [paused]);\n\n // Read by the frame loop, so changing them doesn't restart the stream.\n React.useEffect(() => {\n feel.current = { bob, settle };\n wake.current();\n }, [bob, settle]);\n\n const itemCount = items.length;\n const Title = titleAs as React.ElementType;\n\n // The stream: one frame loop moves every card and redraws the traces.\n React.useEffect(() => {\n const panel = noiseRef.current;\n const calm = calmRef.current;\n const title = titleRef.current;\n const layer = layerRef.current;\n const cards = cardRefs.current;\n const traces = traceRefs.current;\n if (!panel || !calm || !title || !layer || itemCount === 0) return;\n\n const rand = seeded(7);\n\n const sizeOf = (el: HTMLDivElement | null | undefined, stacked: boolean) =>\n el\n ? stacked\n ? { a: el.offsetHeight, c: el.offsetWidth }\n : { a: el.offsetWidth, c: el.offsetHeight }\n : { a: 0, c: 0 };\n\n const measure = (): Geometry => {\n const w = panel.clientWidth;\n const h = panel.clientHeight;\n const stacked = calm.offsetTop > 1;\n const titleBottom = title.offsetTop + title.offsetHeight;\n const sizes = Array.from({ length: itemCount }, (_, i) => sizeOf(cards[i], stacked));\n // Stacked, cards start under the title and come out from beneath it.\n const mask = stacked ? `linear-gradient(to bottom, transparent ${titleBottom - 6}px, #000 ${titleBottom + 30}px)` : \"\";\n layer.style.setProperty(\"mask-image\", mask);\n layer.style.setProperty(\"-webkit-mask-image\", mask);\n return stacked\n ? { stacked, w, h, gate: h, start: titleBottom + 12, lo: GATE.edge, hi: w - GATE.edge, horizon: 0, sizes }\n : { stacked, w, h, gate: w, start: GATE.edge, lo: titleBottom + 16, hi: h - GATE.edge, horizon: h * GATE.horizon, sizes };\n };\n\n let geo = measure();\n\n // How many cards the field holds without turning into a wall.\n const capacity = () => {\n const along = Math.max(1, geo.gate - geo.start);\n const across = Math.max(1, geo.hi - geo.lo);\n const card = geo.sizes.reduce((sum, s) => sum + s.a * s.c, 0) / itemCount || 1;\n return clamp(Math.round(((along * across) / card) * GATE.crowd), Math.min(3, itemCount), Math.min(density, itemCount));\n };\n\n const slots: Slot[] = [];\n const lanes: number[] = [];\n let cursor = 0;\n let spawned = 0;\n let clock = 0;\n // Arrivals are scheduled, not left to chance: each new card starts where it\n // will reach the seam about one beat after the card before it.\n let lastArrival = 0;\n let beat = 1;\n\n const nextItem = () => {\n for (let i = 0; i < itemCount; i++) {\n const idx = (cursor + i) % itemCount;\n if (!slots.some((s) => s.item === idx)) {\n cursor = idx + 1;\n return idx;\n }\n }\n return cursor++ % itemCount;\n };\n\n // Of a few random lanes, take the one furthest from the last few cards.\n const pickLane = (size: number) => {\n const lo = geo.lo;\n const hi = Math.max(lo, geo.hi - size);\n let best = lo;\n let bestScore = -1;\n for (let i = 0; i < 6; i++) {\n const v = lerp(lo, hi, rand());\n const score = lanes.length ? Math.min(...lanes.map((l) => Math.abs(l - v))) : 1;\n if (score > bestScore) {\n bestScore = score;\n best = v;\n }\n }\n lanes.push(best);\n if (lanes.length > 3) lanes.shift();\n return best;\n };\n\n const show = (slot: Slot) => {\n const el = cards[slot.item];\n if (el) el.style.visibility = \"visible\";\n };\n const hide = (item: number) => {\n const el = cards[item];\n if (!el) return;\n el.style.visibility = \"hidden\";\n el.style.opacity = \"0\";\n };\n\n const spawn = (slot: Slot, born = clock, along?: number) => {\n slot.item = nextItem();\n slot.depth = GATE.depthOrder[spawned++ % GATE.depthOrder.length];\n geo.sizes[slot.item] = sizeOf(cards[slot.item], geo.stacked);\n const size = geo.sizes[slot.item];\n const d = GATE.depths[slot.depth];\n const speed = (geo.gate / duration) * TIMING.depthSpeed[slot.depth];\n const lead = (size.a * (1 + d.scale)) / 2; // box start to the visible leading edge\n if (along == null) {\n const earliest = Math.max(clock, born) + TIMING.minRun;\n const target = Math.max(earliest, lastArrival + beat * (1 + TIMING.jitter * (2 * rand() - 1)));\n const lo = geo.start - size.a * GATE.overhang;\n const hi = Math.max(lo, geo.gate - lead - speed * (earliest - clock));\n along = clamp(geo.gate - lead - speed * (target - clock), lo, hi);\n lastArrival = Math.max(lastArrival, clock + (geo.gate - lead - along) / speed);\n }\n slot.a = along;\n slot.c = pickLane(size.c);\n slot.born = born;\n slot.phase = rand() * TAU;\n slot.period = TIMING.bobPeriod + rand() * TIMING.bobVary;\n slot.gated = false;\n slot.emph = 0;\n show(slot);\n };\n\n // Fill the field at once. Live, on the arrival schedule; still, spread\n // evenly from the far edge to just short of the seam.\n const seed = (mode: \"enter\" | \"resume\" | \"still\") => {\n for (const slot of slots) hide(slot.item);\n slots.length = 0;\n lanes.length = 0;\n cursor = 0;\n spawned = 0;\n const n = capacity();\n const along = geo.sizes.reduce((sum, s) => sum + s.a, 0) / itemCount;\n const run = geo.gate - geo.start - along * (1 - GATE.overhang);\n beat = Math.max(TIMING.minBeat, (TIMING.beat * Math.max(1, run) * duration) / geo.gate / n);\n lastArrival = clock;\n const order = Array.from({ length: n }, (_, i) => i).sort(() => rand() - 0.5);\n for (let i = 0; i < n; i++) {\n const slot = { item: -1 } as Slot;\n slots.push(slot);\n if (mode === \"still\") {\n const size = sizeOf(cards[i % itemCount], geo.stacked);\n spawn(slot, clock - TIMING.fadeIn, lerp(geo.start, geo.gate - size.a * 1.15, (order[i] + 0.5) / n));\n } else {\n spawn(slot, mode === \"enter\" ? clock + i * TIMING.stagger : clock - TIMING.fadeIn);\n }\n }\n };\n\n const traceAt = (k: number, x: number, t: number) => {\n const tr = TRACES[k];\n const w = TIMING.traceSpeed[k];\n return (\n tr.amp *\n (0.55 * Math.sin(tr.k[0] * x + w[0] * t + tr.phase) +\n 0.3 * Math.sin(tr.k[1] * x + w[1] * t + 2 * tr.phase) +\n 0.15 * Math.sin(tr.k[2] * x + w[2] * t + 3 * tr.phase))\n );\n };\n\n // Side by side the traces converge on the horizon at the seam; stacked\n // they run across the middle of the field and swell in its center.\n const drawTraces = (t: number) => {\n const { w, h } = geo;\n const y0 = geo.stacked ? (geo.start + h) / 2 : geo.horizon;\n const amp = Math.min(geo.stacked ? 48 : 60, (geo.stacked ? h - geo.start : h - geo.lo) * 0.3);\n for (let k = 0; k < TRACES.length; k++) {\n const path = traces[k];\n if (!path) continue;\n let d = \"\";\n for (let x = 0; ; x = Math.min(w, x + 6)) {\n const env = geo.stacked ? Math.sin((Math.PI * x) / w) ** 0.6 : 1 - smoothstep(w * 0.38, w, x);\n const y = y0 + amp * env * traceAt(k, x, t);\n d += `${x ? \"L\" : \"M\"}${x.toFixed(1)} ${y.toFixed(1)}`;\n if (x >= w) break;\n }\n path.setAttribute(\"d\", d);\n }\n };\n\n const place = (slot: Slot, opacityOnly = false) => {\n const el = cards[slot.item];\n if (!el) return;\n const d = GATE.depths[slot.depth];\n const fade = easeOut(clamp((clock - slot.born) / TIMING.fadeIn, 0, 1));\n const scale = lerp(d.scale, Math.max(d.scale, 1), slot.emph) * lerp(0.96, 1, fade);\n const bob = feel.current.bob * Math.sin((clock / slot.period) * TAU + slot.phase);\n el.style.opacity = String(lerp(d.opacity, 1, slot.emph) * fade);\n el.style.zIndex = String(slot.emph > 0.5 ? 100 : slot.depth * 10 + 1);\n if (opacityOnly) return;\n el.style.transform = geo.stacked\n ? `translate3d(${(slot.c + bob).toFixed(2)}px, ${slot.a.toFixed(2)}px, 0) scale(${scale.toFixed(4)})`\n : `translate3d(${slot.a.toFixed(2)}px, ${(slot.c + bob).toFixed(2)}px, 0) scale(${scale.toFixed(4)})`;\n };\n\n // Reduced motion: a still scatter, no stream, no ticks.\n if (reduced) {\n const still = () => {\n geo = measure();\n clock = 0;\n seed(\"still\");\n for (const slot of slots) place(slot);\n drawTraces(0);\n };\n still();\n const ro = new ResizeObserver(still);\n ro.observe(panel);\n return () => {\n ro.disconnect();\n for (const slot of slots) hide(slot.item);\n };\n }\n\n seed(\"enter\");\n for (const slot of slots) place(slot);\n drawTraces(0);\n\n let factor = pausedRef.current ? 0 : 1;\n let raf = 0;\n let last = 0;\n let running = false;\n let visible = false;\n\n const step = (now: number) => {\n const dt = Math.min(0.05, (now - last) / 1000);\n last = now;\n const target = pausedRef.current || hovering.current ? 0 : 1;\n factor += (target - factor) * (1 - Math.exp(-dt / feel.current.settle));\n if (target === 1 && factor > 0.999) factor = 1;\n if (target === 0 && factor < 0.01) factor = 0;\n clock += dt * factor;\n\n for (const slot of slots) {\n const d = GATE.depths[slot.depth];\n slot.a += (geo.gate / duration) * TIMING.depthSpeed[slot.depth] * dt * factor;\n slot.emph += ((hovered.current === slot.item ? 1 : 0) - slot.emph) * (1 - Math.exp(-dt / TIMING.emphasis));\n\n const size = geo.sizes[slot.item];\n const scale = lerp(d.scale, Math.max(d.scale, 1), slot.emph);\n const lead = slot.a + (size.a * (1 + scale)) / 2;\n const trail = slot.a + (size.a * (1 - scale)) / 2;\n\n if (!slot.gated && lead >= geo.gate) {\n slot.gated = true;\n const bob = feel.current.bob * Math.sin((clock / slot.period) * TAU + slot.phase);\n const mid = slot.c + bob + size.c / 2;\n const half = (size.c * scale) / 2;\n calmApi.current?.gate({ item: slot.item, from: mid - half, to: mid + half, stacked: geo.stacked });\n }\n\n if (trail >= geo.gate + 12) {\n const old = slot.item;\n spawn(slot);\n hide(old);\n }\n place(slot);\n }\n drawTraces(clock);\n\n // Fully stopped and nothing coming forward or back: sleep until woken.\n const settling = slots.some((s) => s.emph > 0.002 && s.emph < 0.998);\n if (target === 0 && factor === 0 && !settling) {\n running = false;\n return;\n }\n raf = requestAnimationFrame(step);\n };\n\n const start = () => {\n if (running || !visible) return;\n running = true;\n last = performance.now();\n raf = requestAnimationFrame(step);\n };\n const stop = () => {\n running = false;\n cancelAnimationFrame(raf);\n };\n wake.current = start;\n\n const io = new IntersectionObserver(([entry]) => {\n visible = entry.isIntersecting;\n if (visible) start();\n else stop();\n });\n io.observe(panel);\n\n let lastStacked = geo.stacked;\n let lastGate = geo.gate;\n const ro = new ResizeObserver(() => {\n geo = measure();\n if (geo.stacked !== lastStacked) {\n seed(\"resume\");\n } else {\n // Keep the stream going: rescale along the drift, clamp across it.\n const ratio = geo.gate / (lastGate || geo.gate);\n for (const slot of slots) {\n slot.a *= ratio;\n slot.c = clamp(slot.c, geo.lo, Math.max(geo.lo, geo.hi - geo.sizes[slot.item].c));\n }\n }\n lastStacked = geo.stacked;\n lastGate = geo.gate;\n for (const slot of slots) place(slot);\n drawTraces(clock);\n });\n ro.observe(panel);\n ro.observe(calm);\n\n return () => {\n stop();\n io.disconnect();\n ro.disconnect();\n wake.current = () => {};\n for (const slot of slots) hide(slot.item);\n };\n }, [itemCount, reduced, density, duration]);\n\n const titleClass =\n \"relative z-20 mx-auto max-w-[17ch] px-6 pt-9 text-center text-[clamp(1.625rem,7.4cqi,2.25rem)] leading-[1.04] font-semibold tracking-[-0.035em] text-balance @[40rem]/noise-gate:pt-12 @[40rem]/noise-gate:text-[clamp(1.75rem,3.9cqi,2.75rem)]\";\n\n return (\n \n
\n {\n if (e.pointerType !== \"mouse\") return;\n hovering.current = true;\n }}\n onPointerLeave={() => {\n hovering.current = false;\n hovered.current = -1;\n wake.current();\n }}\n >\n \n \n {TRACES.map((trace, k) => (\n {\n traceRefs.current[k] = el;\n }}\n className={trace.tone}\n fill=\"none\"\n stroke=\"currentColor\"\n strokeWidth={1}\n strokeLinejoin=\"round\"\n strokeLinecap=\"round\"\n />\n ))}\n \n\n \n {noiseTitle}\n \n\n
\n {items.map((item, i) => (\n {\n cardRefs.current[i] = el;\n }}\n className=\"pointer-events-auto absolute top-0 left-0 w-[min(15rem,80%)] will-change-transform\"\n style={{ opacity: 0, visibility: \"hidden\" }}\n onPointerEnter={(e) => {\n if (e.pointerType !== \"mouse\") return;\n hovered.current = i;\n wake.current();\n }}\n onPointerLeave={() => {\n if (hovered.current === i) hovered.current = -1;\n wake.current();\n }}\n >\n \n
\n ))}\n
\n\n \n \n\n \n {calmTitle}\n \n \n \n );\n}\n\nfunction NoiseCard({ item }: { item: NoiseGateItem }) {\n const tone = TONE[item.tone ?? \"neutral\"];\n const copies = clamp(Math.round(item.repeat ?? 1), 1, 4) - 1;\n return (\n
\n {Array.from({ length: copies }, (_, i) => (\n \n ))}\n
\n {item.icon ? (\n \n {item.icon}\n \n ) : null}\n
\n
\n {item.tag ? (\n \n {item.tag}\n \n ) : null}\n \n {item.title}\n \n {copies > 0 ? (\n \n ×{copies + 1}\n \n ) : null}\n
\n {item.detail ? (\n
\n {item.detail}\n
\n ) : null}\n
\n
\n
\n );\n}\n\ntype Row = { id: number; item: number };\n\n/** The last few items that have a resolved line, newest first, so the log never starts empty. */\nconst initialRows = (items: NoiseGateItem[]): Row[] =>\n items\n .map((item, i) => ({ id: -1 - i, item: i, ok: item.resolved != null }))\n .filter((row) => row.ok)\n .slice(-3)\n .reverse()\n .map(({ id, item }) => ({ id, item }));\n\nfunction CalmPanel({\n ref,\n api,\n items,\n display,\n count: start,\n rollDuration,\n countPrefix,\n countSuffix,\n footer,\n className,\n children,\n}: {\n ref: React.Ref;\n api: React.Ref;\n items: NoiseGateItem[];\n display: \"count\" | \"log\";\n count: number;\n rollDuration: number;\n countPrefix?: React.ReactNode;\n countSuffix?: React.ReactNode;\n footer?: React.ReactNode;\n className?: string;\n children: React.ReactNode;\n}) {\n const panelRef = React.useRef(null);\n const anchorRef = React.useRef(null);\n const glowRef = React.useRef(null);\n const [count, setCount] = React.useState(start);\n const [rows, setRows] = React.useState(() => initialRows(items));\n const [pulses, setPulses] = React.useState([]);\n const nextId = React.useRef(0);\n\n React.useImperativeHandle(ref, () => panelRef.current as HTMLDivElement);\n\n React.useImperativeHandle(\n api,\n () => ({\n gate({ item, from, to, stacked }) {\n const panel = panelRef.current;\n const anchor = anchorRef.current;\n if (!panel || !anchor) return;\n const p = panel.getBoundingClientRect();\n const a = anchor.getBoundingClientRect();\n let route: Pulse[\"route\"] = null;\n let exit: Pulse[\"exit\"] = null;\n if (!stacked) {\n // Down (or up) the seam to the horizon, then along it to the pill or the log.\n const y = display === \"log\" ? a.top + 20 - p.top : a.top + a.height / 2 - p.top;\n const x = a.left - p.left;\n const yc = clamp((from + to) / 2, 8, p.height - 8);\n const leg1 = Math.abs(y - yc);\n const leg2 = Math.max(0, x - 4);\n const total = Math.max(1, leg1 + leg2);\n route = {\n x: [4, 4, x],\n y: [yc, y, y],\n times: [0, leg1 / total, 1],\n duration: clamp(total / TIMING.route, TIMING.routeDuration[0], TIMING.routeDuration[1]),\n };\n exit = { x0: a.right - p.left, x1: p.width - 4, y };\n }\n setPulses((list) => [\n ...list,\n { id: nextId.current++, item, weight: items[item]?.weight ?? 1, stacked, from, to, route, exit },\n ]);\n },\n }),\n [display, items],\n );\n\n const arrive = React.useCallback((pulse: Pulse) => {\n setCount((c) => c + pulse.weight);\n setRows((list) => [{ id: pulse.id, item: pulse.item }, ...list].slice(0, GATE.logRows));\n const glow = glowRef.current;\n if (glow)\n animate(\n glow,\n { opacity: [0, 1, 0] },\n { duration: TIMING.glow.duration, times: [...TIMING.glow.times], ease: TIMING.glow.ease },\n );\n }, []);\n\n const done = React.useCallback((id: number) => {\n setPulses((list) => list.filter((p) => p.id !== id));\n }, []);\n\n return (\n \n {children}\n\n \n {display === \"count\" ? (\n
\n \n }\n className=\"relative mx-2 inline-flex h-11 max-w-[calc(100%-4.5rem)] shrink-0 items-center gap-2 rounded-full border border-current/25 bg-current/[0.08] px-4 text-[clamp(0.8125rem,3.9cqi,0.9375rem)] font-medium whitespace-nowrap @[40rem]/noise-gate:text-[clamp(0.8125rem,1.75cqi,0.9375rem)]\"\n >\n \n \n \n {countPrefix != null ? {countPrefix} : null}\n \n {countSuffix != null ? {countSuffix} : null}\n \n \n {countPrefix} {count.toLocaleString(\"en-US\")} {countSuffix}\n \n
\n \n \n ) : (\n
\n \n }\n className=\"relative mx-2 h-[12.5rem] w-[min(19rem,calc(100%-4.5rem))] shrink-0 overflow-hidden text-left [mask-image:linear-gradient(to_bottom,#000_45%,transparent)] @[40rem]/noise-gate:h-full\"\n >\n \n {rows.map((row) => {\n const item = items[row.item];\n if (!item) return null;\n return (\n // A new line opens at the top and pushes the rest down; the oldest fades out under the mask.\n \n \n {item.resolved ?? item.title}\n {item.resolvedDetail != null ? (\n {item.resolvedDetail}\n ) : null}\n \n );\n })}\n \n \n \n
\n )}\n\n {footer ? (\n
\n {footer}\n
\n ) : null}\n \n\n {pulses.map((pulse) => (\n \n ))}\n \n );\n}\n\n/** The seam lighting up where a card went through, and the dot routed to the counter. */\nfunction PulseView({\n pulse,\n onArrive,\n onDone,\n}: {\n pulse: Pulse;\n onArrive: (pulse: Pulse) => void;\n onDone: (id: number) => void;\n}) {\n const flashRef = React.useRef(null);\n const dotRef = React.useRef(null);\n const exitRef = React.useRef(null);\n\n React.useEffect(() => {\n const flash = flashRef.current;\n if (!flash) return;\n let live = true;\n const running: { stop: () => void }[] = [];\n\n running.push(\n animate(\n flash,\n { opacity: [0, 1, 0] },\n { duration: TIMING.flash.duration, times: [...TIMING.flash.times], ease: TIMING.flash.ease },\n ),\n );\n\n const settle = (seconds: number) =>\n running.push(animate(0, 1, { duration: seconds, onComplete: () => live && onDone(pulse.id) }));\n\n const arrived = () => {\n if (!live) return;\n onArrive(pulse);\n const exit = exitRef.current;\n if (pulse.exit && exit && pulse.exit.x1 > pulse.exit.x0) {\n const { x0, x1, y } = pulse.exit;\n running.push(\n animate(\n exit,\n { x: [x0, x1], y: [y, y], opacity: [0.6, 0] },\n {\n duration: clamp(\n ((x1 - x0) / TIMING.route) * TIMING.exitPace,\n TIMING.exitDuration[0],\n TIMING.exitDuration[1],\n ),\n ease: TIMING.exitEase,\n onComplete: () => live && onDone(pulse.id),\n },\n ),\n );\n } else {\n settle(TIMING.linger);\n }\n };\n\n const dot = dotRef.current;\n if (pulse.route && dot) {\n const { x, y, times, duration } = pulse.route;\n running.push(\n animate(dot, { x, y, opacity: [0, 1, 1] }, { duration, times, ease: [...TIMING.routeEase], onComplete: arrived }),\n );\n } else {\n running.push(animate(0, 1, { duration: TIMING.tickDelay, onComplete: arrived }));\n }\n\n return () => {\n live = false;\n for (const r of running) r.stop();\n };\n }, [pulse, onArrive, onDone]);\n\n const dotClass =\n \"pointer-events-none absolute top-0 left-0 -mt-[3px] -ml-[3px] size-1.5 rounded-full bg-current opacity-0 ring-[3px] ring-current/20\";\n\n return (\n <>\n \n \n \n \n {pulse.route ? : null}\n {pulse.exit ? : null}\n \n );\n}\n\nfunction Digits({ value, duration }: { value: number; duration: number }) {\n const chars = value.toLocaleString(\"en-US\").split(\"\");\n return (\n \n {chars.map((char, i) => (\n // Keyed from the right, so a new leading digit doesn't re-roll the rest.\n \n ))}\n \n );\n}\n\nfunction Digit({ char, duration }: { char: string; duration: number }) {\n return (\n \n \n \n {char}\n \n \n \n );\n}\n\nfunction CheckIcon({ className }: { className?: string }) {\n return (\n \n \n \n );\n}\n" } ] }