Inference that runs where your users are

Lumbra routes every call to the closest free GPU. Each ring behind this text is traffic landing in one of our regions right now.

Start building See regions

{served.toLocaleString("en-US")}{" "} requests served today

{line.kind} {" · "} {line.region} {" · "} {line.detail}

); } ``` ## Examples Finished sections built with Pulse. Each one installs whole, with the component included. ### Waitlist A language tutor's waitlist where signups land on their cities and joining drops an orange ring labelled You, roughly where you are. Install this demo, with the component included: ```bash npx shadcn@latest add @keyframeui/pulse-waitlist-demo ``` ```tsx title="components/pulse-waitlist-demo.tsx" "use client"; import * as React from "react"; import { Pulse, type PulseEvent } from "@/components/ui/pulse"; // A flattened world map squeezed into the top half of the box, where the copy doesn't cover it. const place = (lon: number, lat: number) => ({ x: 0.04 + ((lon + 180) / 360) * 0.92, y: Math.min(0.44, Math.max(0.05, 0.06 + (((90 - lat) / 180 - 0.2) / 0.5) * 0.34)), }); const CITIES = [ { name: "Lisbon", ...place(-9.1, 38.7) }, { name: "Seoul", ...place(127, 37.6) }, { name: "Austin", ...place(-97.7, 30.3) }, { name: "Lagos", ...place(3.4, 6.5) }, { name: "São Paulo", ...place(-46.6, -23.5) }, { name: "Berlin", ...place(13.4, 52.5) }, { name: "Mumbai", ...place(72.9, 19.1) }, { name: "Tokyo", ...place(139.7, 35.7) }, { name: "Toronto", ...place(-79.4, 43.7) }, { name: "Mexico City", ...place(-99.1, 19.4) }, { name: "Nairobi", ...place(36.8, -1.3) }, { name: "Sydney", ...place(151.2, -33.9) }, { name: "Jakarta", ...place(106.8, -6.2) }, { name: "Paris", ...place(2.35, 48.9) }, ]; /** A rough guess at where the visitor is, from their time zone alone: no prompt, no lookup. */ function whereYouAre() { const zone = Intl.DateTimeFormat().resolvedOptions().timeZone ?? ""; const lon = (-new Date().getTimezoneOffset() / 60) * 15; const area = zone.split("/")[0]; const lat = area === "Europe" ? 48 : area === "Africa" ? 5 : area === "Asia" ? 28 : area === "Australia" ? -30 : area === "Pacific" ? -15 : area === "America" ? (lon > -50 ? -20 : 38) : 40; return place(lon, lat); } let nextId = 0; export function PulseWaitlistDemo() { const [events, setEvents] = React.useState([]); const [count, setCount] = React.useState(12_481); const [latest, setLatest] = React.useState("Lisbon"); const [email, setEmail] = React.useState(""); const [joined, setJoined] = React.useState(null); // Signups from around the world, one every 0.9–2.6s. React.useEffect(() => { let timer = 0; const tick = () => { const city = CITIES[Math.floor(Math.random() * CITIES.length)]; const jitter = () => (Math.random() - 0.5) * 0.025; setEvents((list) => [ ...list.slice(-11), { id: `signup-${nextId++}`, x: city.x + jitter(), y: city.y + jitter(), strength: 0.35 + Math.random() * 0.2, tone: "ink", label: city.name }, ]); setCount((n) => n + 1); setLatest(city.name); timer = window.setTimeout(tick, 900 + Math.random() * 1700); }; timer = window.setTimeout(tick, 600); return () => window.clearTimeout(timer); }, []); const join = (e: React.FormEvent) => { e.preventDefault(); if (joined) return; const you = whereYouAre(); setEvents((list) => [...list.slice(-11), { id: `you-${nextId++}`, ...you, strength: 1, tone: "accent", label: "You" }]); setJoined(count + 1); setCount((n) => n + 1); setLatest("You"); }; return ( {/* The map lives in the top half; the copy sits on a clean ground below it. */}

Talk your way into a new language

Parlance is a tutor you speak with, not tap at. It hears your accent, fixes it gently and remembers every word you trip on. The list opens in March.

{joined !== null ? `You're number ${joined.toLocaleString("en-US")}. We'll write when your city opens.` : ""}

{count.toLocaleString("en-US")}

people on the list

Latest · {latest}

); } ``` ### Status Page An API status page where every region's health checks pass as small rings, until one region turns red and an incident runs from investigating to resolved. Install this demo, with the component included: ```bash npx shadcn@latest add @keyframeui/pulse-status-demo ``` ```tsx title="components/pulse-status-demo.tsx" "use client"; import * as React from "react"; import { Pulse, type PulseEvent } from "@/components/ui/pulse"; import { cn } from "@/lib/utils"; // A flattened world map squeezed into the band between the headline and the cards. const place = (lon: number, lat: number) => ({ x: 0.05 + ((lon + 180) / 360) * 0.9, y: 0.36 + (((90 - lat) / 180 - 0.2) / 0.5) * 0.24, }); const REGIONS = [ { code: "sfo1", city: "San Francisco", ...place(-122.4, 37.8) }, { code: "iad1", city: "Washington", ...place(-77.5, 39) }, { code: "gru1", city: "São Paulo", ...place(-46.6, -23.5) }, { code: "lhr1", city: "London", ...place(-0.45, 51.5) }, { code: "fra1", city: "Frankfurt", ...place(8.7, 50.1) }, { code: "bom1", city: "Mumbai", ...place(72.9, 19.1) }, { code: "sin1", city: "Singapore", ...place(103.8, 1.35) }, { code: "syd1", city: "Sydney", ...place(151.2, -33.9) }, { code: "nrt1", city: "Tokyo", ...place(140.4, 35.8) }, ]; type Step = { at: string; state: "Investigating" | "Identified" | "Monitoring" | "Resolved"; text: string }; const INCIDENTS: { region: string; title: string; summary: string; steps: Step[] }[] = [ { region: "fra1", title: "Elevated errors in Frankfurt", summary: "Inference calls in fra1 are failing at 4%. Every other region is healthy.", steps: [ { at: "14:02", state: "Investigating", text: "Inference calls in fra1 are returning 503s." }, { at: "14:06", state: "Identified", text: "A GPU pool failed its driver update. Traffic is moving to lhr1." }, { at: "14:11", state: "Monitoring", text: "Error rate is back under 0.1%." }, { at: "14:19", state: "Resolved", text: "fra1 is serving normally." }, ], }, { region: "sin1", title: "Slow responses in Singapore", summary: "p95 latency in sin1 is 2.4 s. Requests are completing.", steps: [ { at: "09:41", state: "Investigating", text: "p95 latency in sin1 rose to 2.4 s." }, { at: "09:44", state: "Identified", text: "A congested route to the storage tier." }, { at: "09:52", state: "Monitoring", text: "Traffic rerouted. p95 is back to 180 ms." }, { at: "10:03", state: "Resolved", text: "sin1 latency is normal." }, ], }, ]; const STEP_MS = 4500; // each incident update const CALM_MS = 6000; // all clear before the next incident let nextId = 0; export function PulseStatusDemo() { const [events, setEvents] = React.useState([]); // `step` -1 is the quiet start; 0–2 an open incident; 3 resolved, which is also the calm before the next one. const [phase, setPhase] = React.useState({ incident: 0, step: -1 }); const incident = INCIDENTS[phase.incident]; const open = phase.step >= 0 && phase.step < 3; const failing = open ? incident.region : null; // The incident's clock: updates every 4.5s, then a calm spell, then the next incident. React.useEffect(() => { const wait = phase.step === -1 || phase.step === 3 ? CALM_MS : STEP_MS; const timer = window.setTimeout(() => { setPhase((p) => p.step === 3 ? { incident: (p.incident + 1) % INCIDENTS.length, step: 0 } : { ...p, step: p.step + 1 }, ); }, wait); return () => window.clearTimeout(timer); }, [phase]); // Health checks: one every 280–650ms from a random region. The failing one checks more often, in red. const failingRef = React.useRef<{ region: string | null; step: number }>({ region: null, step: -1 }); React.useEffect(() => { failingRef.current = { region: failing, step: phase.step }; }, [failing, phase.step]); React.useEffect(() => { let timer = 0; const tick = () => { const { region: bad, step } = failingRef.current; const region = bad && Math.random() < 0.35 ? REGIONS.find((r) => r.code === bad)! : REGIONS[Math.floor(Math.random() * REGIONS.length)]; // While monitoring, only some of the failing region's checks still fail. const fails = region.code === bad && (step < 2 || Math.random() < 0.4); const jitter = () => (Math.random() - 0.5) * 0.02; setEvents((list) => [ ...list.slice(-11), { id: `check-${nextId++}`, x: region.x + jitter(), y: region.y + jitter(), strength: fails ? 0.8 : 0.3 + Math.random() * 0.15, tone: fails ? "accent" : "ink", label: region.code, }, ]); timer = window.setTimeout(tick, 280 + Math.random() * 370); }; timer = window.setTimeout(tick, 400); return () => window.clearTimeout(timer); }, []); const shown = phase.step >= 0 ? incident.steps.slice(0, phase.step + 1).reverse() : []; return ( {/* The status line sits on a clean ground; the map shows below it. */}

Ferrule Status Subscribe

{open ? incident.title : "All systems operational"}

{/* The summary describes the outage; once it's identified, the latest update says where things stand. */} {open ? (phase.step === 0 ? incident.summary : incident.steps[phase.step].text) : "Health checks are passing in all 9 regions."}

Regions

99.98% over 90 days

{r.code} {r.city} {down ? "degraded" : "operational"}

{shown.length ? incident.title : "Incidents"}

{shown.length ? (

0 && "text-muted-foreground")}> {s.at} 0 && "text-foreground/70", )} > {s.state} {" "} {s.text}

) : (

No open incidents. Each region is checked every 30 seconds.

)}

); } ``` ## Props | Prop | Type | Default | Description | | --- | --- | --- | --- | | `events` | `PulseEvent[]` | | Your feed: `{ id, x?, y?, strength?, tone?, label? }`. Each new id lands once as a ring; ids already there on mount count as history and don't. `x` and `y` are 0–1 of the box (a missing one gets a point picked from the id), `strength` 0–1 sets how far the ring carries (default 0.6), and `tone` is `"ink"` or `"accent"`. A `label` (a region, a city) prints just above the point in the event's tone in small mono type for about a second, so a viewer can match a ring to its line in your log. Events that arrive while it's off screen are dropped. | | `ambient` | `number` | `0` | Events per minute it lands on its own while your feed is quiet, so it can play alone. A real event pushes the next one back. `0` turns it off. | | `spacing` | `number` | `18` | Distance between dots, in px. | | `ringSpeed` | `number` | `420` | How fast a ring runs out from its point, in px per second. | | `ringDuration` | `number` | `1.6` | How long a ring takes to fade to nothing, in seconds. The spot it hit stays lit for 2s either way. | | `paused` | `boolean` | `false` | Draw the still grid and ignore new events. | | `inkClassName` | `string` | `"text-zinc-900 dark:text-zinc-100"` | A `text-*` color for the dots and `ink` rings. The canvas reads it, so `dark:` variants work; dots at rest draw it at low opacity. | | `accentClassName` | `string` | `"text-[#ff5a1f] dark:text-[#ff6a3d]"` | A `text-*` color that `accent` events paint as their ring passes. | | `onLand` | `(event: PulseEvent) => void` | | Called when an event's ring starts, including the ones `ambient` lands. | | `children` | `React.ReactNode` | | The section drawn over the dots. | | `className` | `string` | | Extra classes for the root. | ## What to keep To adapt it, change its props first. When you do edit `components/ui/pulse.tsx`, keep these, which make it feel and behave right: - One rAF loop paints one canvas: the still grid is drawn once offscreen and blitted each frame, lifted dots are batched into one path per tone and level, and the loop stops when no ring is left. - Only ids new since the last `events` list land; the first list is history, and events that arrive off screen or in a hidden tab are dropped, not queued. - Rings add up where they cross and never cancel; past `maxRings` the oldest is dropped. - Labels are stroked with the ground's color so dots never cut through them, and a repeat from the same spot takes over the label already showing. - Under reduced motion there are no rings: a still spot lights by opacity alone (the dots keep one size), and labels fade in place without the rise. Its timing (durations, delays, springs and easings) is all in the `TIMING` block at the top of the file; the timing props default to it. ## Source ```tsx title="components/ui/pulse.tsx" "use client"; import * as React from "react"; import { cn } from "@/lib/utils"; /** * Keep: * - One rAF loop paints one canvas: the still grid is drawn once offscreen and blitted each frame, * lifted dots are batched into one path per tone and level, and the loop stops when no ring is * left. * - Only ids new since the last `events` list land; the first list is history, and events that * arrive off screen or in a hidden tab are dropped, not queued. * - Rings add up where they cross and never cancel; past `maxRings` the oldest is dropped. * - Labels are stroked with the ground's color so dots never cut through them, and a repeat from * the same spot takes over the label already showing. * - Under reduced motion there are no rings: a still spot lights by opacity alone (the dots keep * one size), and labels fade in place without the rise. */ const TIMING = { /** How fast a ring leaves its point, in px/s (the `ringSpeed` prop). */ ringSpeed: 420, /** A ring fading to nothing, in seconds (the `ringDuration` prop). */ ringDuration: 1.6, /** The afterglow at the landing point, in seconds. */ glow: 2, /** The still spot that replaces a ring under reduced motion, in seconds. */ spot: 1.2, /** A label in, held, and gone by, in seconds from when it lands. */ label: { in: 0.12, hold: 0.8, out: 1.1 }, /** Events per minute it lands on its own while the feed is quiet (`ambient`); 0 turns it off. */ ambient: 0, } as const; /* ───────────────────────────────────────────────────────── * PULSE STORYBOARD * * rest a still grid of faint dots fills the box, like * water with nothing landing on it * land a new event (a new id in `events`) drops onto its * point. A ring leaves it at 420px/s: the dots under * the 60px crest swell from 1 to 2.8px and take the * event's tone, a weaker second crest follows, and * both fade out over 1.6s and with distance. Strength * sets how far it carries: 260px for a whisper, * 640px for a big one * glow the landing point stays lit for 2s after the ring * has left, so you can still see where it hit * label an event with a `label` prints it 10px above its * point in the event's tone, 11px mono: in over * 120ms with a 4px rise, held, gone by 1.1s, nudged * inside the box near an edge. A repeat from the * same spot takes over the label already showing; a * different one nearby prints a line higher. It's * how a viewer tells which ring is which log line * weight dark ink on a light ground draws heavier (rest * 0.24, crest to 3.2px at full opacity) than light * ink on a dark one (rest 0.16, crest to 2.8px), so * both schemes read the same * overlap rings add up where they cross and never cancel. * Past 12 at once the oldest is dropped * ambient with `ambient` set, it lands events of its own at * random points while your feed is quiet, so the * surface can play alone. A real event pushes the * next ambient one back * sleep off screen or in a hidden tab nothing draws, and * events that arrive then are dropped, not queued * reduced no rings: the dots within 40px of the point light * in the tone and fade out by opacity over 1.2s. * Labels fade in and out in place, without the rise * ───────────────────────────────────────────────────────── */ const PULSE = { band: 60, // px, width of a ring's crest echo: { lag: 1.3, amp: 0.35 }, // the second crest: bands behind the first, share of its height reach: [260, 640], // px a ring carries at strength 0 and 1 gain: [0.75, 1], // crest height at strength 0 and 1 // Dot weight per ground: radius at rest and on a full crest (px), rest opacity, ink crest opacity range. onLight: { dot: [1, 3.2], restAlpha: 0.24, crest: [0.34, 1] }, // dark ink on a light ground onDark: { dot: [1, 2.8], restAlpha: 0.16, crest: [0.2, 1] }, // light ink on a dark ground accentCrest: [0.35, 1], // accent dots' opacity range, either ground label: { rise: 4, gap: 10, size: 11, halo: 3, edge: 6 }, // px, px, px, px, px labelSame: 40, // px, a repeat of the same label this close takes over the one showing labelSlots: 3, // lines a crowded spot stacks labels into glow: { radius: 26 }, // px, the afterglow at the landing point reduced: { radius: 40 }, // px, the still spot that replaces a ring strength: 0.6, // an event's strength when it doesn't say maxRings: 12, levels: 10, // size and opacity steps lifted dots are batched into maxDpr: 2, } as const; const REDUCED = "(prefers-reduced-motion: reduce)"; const subscribeReduced = (onChange: () => void) => { const query = window.matchMedia(REDUCED); query.addEventListener("change", onChange); return () => query.removeEventListener("change", onChange); }; /** Reduced motion from the media query, false on the server and in the hydration render. */ function useReduced() { return React.useSyncExternalStore( subscribeReduced, () => window.matchMedia(REDUCED).matches, () => false, ); } const clamp01 = (t: number) => Math.min(1, Math.max(0, t)); const easeOut = (t: number) => 1 - (1 - t) ** 3; /** A seeded generator, so an event without a point always lands in the same place. */ function seeded(key: string) { let h = 2166136261; for (let i = 0; i < key.length; i++) h = Math.imul(h ^ key.charCodeAt(i), 16777619); return () => { h = (h + 0x6d2b79f5) | 0; let t = Math.imul(h ^ (h >>> 15), 1 | h); t = (t + Math.imul(t ^ (t >>> 7), 61 | t)) ^ t; return ((t ^ (t >>> 14)) >>> 0) / 4294967296; }; } export interface PulseEvent { /** Stable id. An event lands once, the first time its id shows up. */ id: string | number; /** Where it lands across the box, 0–1. A missing one gets a point picked from the id. */ x?: number; /** Where it lands down the box, 0–1. */ y?: number; /** 0–1: how far the ring carries and how much the dots swell. */ strength?: number; /** The color the dots take as the ring passes. */ tone?: "accent" | "ink"; /** A few characters printed just above the point for about a second, like the region or city it came from. */ label?: string; } type Ring = { x: number; y: number; t0: number; strength: number; accent: boolean; label?: string; labelT0: number; // when the label started showing; a repeat from the same spot carries it on labelX: number; labelY: number; slot: number; // lines above the point, so two nearby labels never print over each other }; /** Relative luminance of any CSS color, read back from a 1px canvas so every color syntax works. */ function luminance(color: string) { const c = document.createElement("canvas").getContext("2d", { willReadFrequently: true }); if (!c) return 0; c.fillStyle = color; c.fillRect(0, 0, 1, 1); const [r, g, b] = c.getImageData(0, 0, 1, 1).data; const lin = (v: number) => { const s = v / 255; return s <= 0.04045 ? s / 12.92 : ((s + 0.055) / 1.055) ** 2.4; }; return 0.2126 * lin(r) + 0.7152 * lin(g) + 0.0722 * lin(b); } /** The first painted background at or above `el`, for the halo behind labels. */ function groundColor(el: HTMLElement | null) { for (let node = el; node; node = node.parentElement) { const bg = getComputedStyle(node).backgroundColor; if (bg && bg !== "transparent" && !/rgba?$.*,\s*0$$/.test(bg)) return bg; } return null; } type Options = { spacing: number; ambient: number; paused: boolean; ringSpeed: number; ringDuration: number; reduced: boolean; }; function createPulse() { let root: HTMLElement | null = null; let canvas: HTMLCanvasElement | null = null; let ctx: CanvasRenderingContext2D | null = null; let probes: { ink: HTMLElement; accent: HTMLElement } | null = null; let ink = "currentColor"; let accent = "currentColor"; let halo: string | null = null; // the ground behind the box, stroked around labels let font = "monospace"; let weight: (typeof PULSE)["onLight" | "onDark"] = PULSE.onDark; let options: Options = { spacing: 18, ambient: TIMING.ambient, paused: false, ringSpeed: TIMING.ringSpeed, ringDuration: TIMING.ringDuration, reduced: false, }; let onLand: ((event: PulseEvent) => void) | null = null; // The grid, rebuilt when the root changes size. let width = 0; let height = 0; let dpr = 1; let cols = 0; let rows = 0; let ox = 0; let oy = 0; let liftInk = new Float32Array(0); let liftAccent = new Float32Array(0); let buckets: Int32Array[] = []; // dot indices per tone × level let bucketCounts = new Int32Array(0); let rest: HTMLCanvasElement | null = null; // the still grid, blitted every frame const rings: Ring[] = []; let raf = 0; let inView = false; let pageVisible = true; let ambientTimer = 0; let ambientCount = 0; const ambientRandom = seeded("pulse-ambient"); const cleanups: (() => void)[] = []; const now = () => performance.now() / 1000; const awake = () => inView && pageVisible; const ringLife = () => (options.reduced ? TIMING.spot : Math.max(options.ringDuration, TIMING.glow)); function readColors() { if (!probes) return; const style = getComputedStyle(probes.ink); ink = style.color; font = style.fontFamily || "monospace"; accent = getComputedStyle(probes.accent).color; halo = groundColor(root); weight = luminance(ink) < 0.4 ? PULSE.onLight : PULSE.onDark; drawRest(); } function drawRest() { if (!rest || !width) return; const c = rest.getContext("2d"); if (!c) return; c.setTransform(1, 0, 0, 1, 0, 0); c.clearRect(0, 0, rest.width, rest.height); c.setTransform(dpr, 0, 0, dpr, 0, 0); c.fillStyle = ink; c.globalAlpha = weight.restAlpha; c.beginPath(); const r = weight.dot[0]; for (let row = 0; row < rows; row++) { for (let col = 0; col < cols; col++) { const x = ox + col * options.spacing; const y = oy + row * options.spacing; c.moveTo(x + r, y); c.arc(x, y, r, 0, Math.PI * 2); } } c.fill(); } function layout() { if (!root || !canvas) return; const w = root.clientWidth; const h = root.clientHeight; const nextDpr = Math.min(window.devicePixelRatio || 1, PULSE.maxDpr); const s = options.spacing; const nextCols = Math.max(1, Math.floor(w / s)); const nextRows = Math.max(1, Math.floor(h / s)); if (w === width && h === height && nextDpr === dpr && nextCols === cols && nextRows === rows) return; width = w; height = h; dpr = nextDpr; cols = nextCols; rows = nextRows; ox = (w - (cols - 1) * s) / 2; oy = (h - (rows - 1) * s) / 2; canvas.width = Math.round(w * dpr); canvas.height = Math.round(h * dpr); rest ??= document.createElement("canvas"); rest.width = canvas.width; rest.height = canvas.height; const count = cols * rows; liftInk = new Float32Array(count); liftAccent = new Float32Array(count); buckets = Array.from({ length: PULSE.levels * 2 }, () => new Int32Array(count)); bucketCounts = new Int32Array(PULSE.levels * 2); drawRest(); wake(); } /** Adds one ring's lift to the dots it touches this frame. */ function addRing(ring: Ring, t: number) { const age = t - ring.t0; const lift = ring.accent ? liftAccent : liftInk; const gain = PULSE.gain[0] + (PULSE.gain[1] - PULSE.gain[0]) * ring.strength; if (options.reduced) { const fade = clamp01(1 - age / TIMING.spot); const R = PULSE.reduced.radius; eachDot(ring.x, ring.y, R, (i, d) => { lift[i] = Math.min(1, lift[i] + fade * (1 - d / R) * gain * 1.4); }); return; } const radius = options.ringSpeed * age; const half = PULSE.band / 2; const reach = PULSE.reach[0] + (PULSE.reach[1] - PULSE.reach[0]) * ring.strength; const time = clamp01(1 - age / options.ringDuration); const timeFade = time * Math.sqrt(time); const glow = clamp01(1 - age / TIMING.glow); const echoAt = radius - PULSE.band * PULSE.echo.lag; const extent = timeFade > 0 ? Math.min(radius + PULSE.band, reach) : PULSE.glow.radius; eachDot(ring.x, ring.y, Math.max(extent, PULSE.glow.radius), (i, d) => { let v = 0; if (timeFade > 0 && d < reach) { const k = (d - radius) / half; let crest = Math.exp(-k * k); if (echoAt > 0) { const k2 = (d - echoAt) / half; crest += PULSE.echo.amp * Math.exp(-k2 * k2); } v = crest * timeFade * (1 - d / reach) * gain; } if (glow > 0 && d < PULSE.glow.radius) { v = Math.max(v, glow * glow * (1 - d / PULSE.glow.radius) * gain); } if (v > 0) lift[i] = Math.min(1, lift[i] + v); }); } /** Calls `fn` for every dot within `r` px of (x, y), with its distance. */ function eachDot(x: number, y: number, r: number, fn: (i: number, d: number) => void) { const s = options.spacing; const c0 = Math.max(0, Math.ceil((x - r - ox) / s)); const c1 = Math.min(cols - 1, Math.floor((x + r - ox) / s)); const r0 = Math.max(0, Math.ceil((y - r - oy) / s)); const r1 = Math.min(rows - 1, Math.floor((y + r - oy) / s)); for (let row = r0; row <= r1; row++) { const dy = oy + row * s - y; for (let col = c0; col <= c1; col++) { const dx = ox + col * s - x; const d = Math.sqrt(dx * dx + dy * dy); if (d <= r) fn(row * cols + col, d); } } } function frame() { raf = 0; if (!ctx || !canvas || !rest) return; const t = now(); const life = ringLife(); for (let i = rings.length - 1; i >= 0; i--) if (t - rings[i].t0 > life) rings.splice(i, 1); ctx.setTransform(1, 0, 0, 1, 0, 0); ctx.globalAlpha = 1; ctx.clearRect(0, 0, canvas.width, canvas.height); ctx.drawImage(rest, 0, 0); if (!rings.length) return; liftInk.fill(0); liftAccent.fill(0); for (const ring of rings) addRing(ring, t); // Batch every lifted dot by tone and level, then fill each batch in one path. bucketCounts.fill(0); const L = PULSE.levels; for (let i = 0; i < liftInk.length; i++) { const a = liftAccent[i]; const n = liftInk[i]; const v = Math.max(a, n); if (v < 0.04) continue; const level = Math.min(L - 1, Math.floor(v * L)); const b = (a >= n ? L : 0) + level; buckets[b][bucketCounts[b]++] = i; } ctx.setTransform(dpr, 0, 0, dpr, 0, 0); const s = options.spacing; const [r0, r1] = weight.dot; for (let b = 0; b < L * 2; b++) { const n = bucketCounts[b]; if (!n) continue; const isAccent = b >= L; const v = ((b % L) + 0.5) / L; // Reduced motion changes opacity only; the dots keep one size. const r = options.reduced ? r0 + (r1 - r0) * 0.6 : r0 + (r1 - r0) * v; const [a0, a1] = isAccent ? PULSE.accentCrest : weight.crest; ctx.globalAlpha = a0 + (a1 - a0) * v; ctx.fillStyle = isAccent ? accent : ink; ctx.beginPath(); const list = buckets[b]; for (let k = 0; k < n; k++) { const i = list[k]; const x = ox + (i % cols) * s; const y = oy + Math.floor(i / cols) * s; ctx.moveTo(x + r, y); ctx.arc(x, y, r, 0, Math.PI * 2); } ctx.fill(); } drawLabels(t); raf = requestAnimationFrame(frame); } /** Each labelled event's text, just above its point, on a halo of the ground so dots never cut through it. */ function drawLabels(t: number) { if (!ctx) return; const L = { ...TIMING.label, ...PULSE.label }; ctx.font = `500 ${L.size}px ${font}`; ctx.textAlign = "center"; ctx.textBaseline = "alphabetic"; ctx.lineJoin = "round"; ctx.lineWidth = L.halo; for (const ring of rings) { if (!ring.label) continue; const age = t - ring.labelT0; if (age >= L.out) continue; const fadeIn = clamp01(age / L.in); const fadeOut = age < L.hold ? 1 : 1 - (age - L.hold) / (L.out - L.hold); const rise = options.reduced ? 0 : (1 - easeOut(fadeIn)) * L.rise; const half = ctx.measureText(ring.label).width / 2; const x = Math.min(width - L.edge - half, Math.max(L.edge + half, ring.labelX)); // Above the point (a line higher per slot), or below it when the top edge is too close. const lift = ring.slot * (L.size + 4); // Reduced motion lights a 40px spot instead of a ring, so the label clears it. const gap = options.reduced ? PULSE.reduced.radius * 0.6 : L.gap; const above = ring.labelY - gap - lift; const y = Math.min(height - L.edge, above - L.size < L.edge ? ring.labelY + gap + L.size * 0.8 + lift : above) + rise; ctx.globalAlpha = Math.min(fadeIn, fadeOut) * (ring.accent ? 1 : 0.8); if (halo) { ctx.strokeStyle = halo; ctx.strokeText(ring.label, x, y); } ctx.fillStyle = ring.accent ? accent : ink; ctx.fillText(ring.label, x, y); } } function wake() { if (raf || !awake() || !ctx) return; raf = requestAnimationFrame(frame); } function land(event: PulseEvent) { if (options.paused || !awake() || !width) return; let x = event.x; let y = event.y; if (x === undefined || y === undefined) { const random = seeded(String(event.id)); x ??= 0.06 + random() * 0.88; y ??= 0.08 + random() * 0.84; } const t = now(); const ring: Ring = { x: clamp01(x) * width, y: clamp01(y) * height, t0: t, strength: clamp01(event.strength ?? PULSE.strength), accent: event.tone === "accent", label: event.label, labelT0: t, labelX: 0, labelY: 0, slot: 0, }; ring.labelX = ring.x; ring.labelY = ring.y; if (ring.label) placeLabel(ring, t); rings.push(ring); if (rings.length > PULSE.maxRings) rings.splice(0, rings.length - PULSE.maxRings); onLand?.(event); scheduleAmbient(); wake(); } /** * Keeps labels apart. A repeat of a label still showing nearby takes it over in place, already * faded in. A different one that would overlap goes on the first free line above. */ function placeLabel(ring: Ring, t: number) { const L = { ...TIMING.label, ...PULSE.label }; const charW = L.size * 0.62; // a mono advance, close enough to test for overlap const live = rings.filter((r) => r.label && t - r.labelT0 < L.out); for (const r of live) { if (r.label === ring.label && Math.hypot(r.labelX - ring.x, r.labelY - ring.y) < PULSE.labelSame) { ring.labelT0 = t - Math.min(t - r.labelT0, L.in); ring.labelX = r.labelX; ring.labelY = r.labelY; ring.slot = r.slot; r.label = undefined; return; } } const wide = (r: Ring) => (r.label?.length ?? 0) * charW; for (let slot = 0; slot < PULSE.labelSlots; slot++) { const clash = live.some( (r) => r.label && Math.abs(r.labelX - ring.x) < (wide(r) + wide(ring)) / 2 + 6 && Math.abs(r.labelY - r.slot * (L.size + 4) - (ring.y - slot * (L.size + 4))) < L.size + 2, ); if (!clash) { ring.slot = slot; return; } } } /** The next event of its own, a random wait around 60 / `ambient` seconds from now. */ function scheduleAmbient() { window.clearTimeout(ambientTimer); ambientTimer = 0; if (options.ambient <= 0 || options.paused || !awake()) return; const wait = (60 / options.ambient) * (0.5 + ambientRandom()) * 1000; ambientTimer = window.setTimeout(() => { ambientTimer = 0; const accentOne = ambientRandom() < 0.25; land({ id: `ambient-${ambientCount++}`, x: 0.06 + ambientRandom() * 0.88, y: 0.08 + ambientRandom() * 0.84, strength: accentOne ? 0.8 : 0.3 + ambientRandom() * 0.35, tone: accentOne ? "accent" : "ink", }); }, wait); } function setAwake() { if (awake()) { wake(); scheduleAmbient(); } else { cancelAnimationFrame(raf); raf = 0; rings.length = 0; window.clearTimeout(ambientTimer); ambientTimer = 0; } } return { connect(el: { root: HTMLElement; canvas: HTMLCanvasElement; ink: HTMLElement; accent: HTMLElement }) { root = el.root; canvas = el.canvas; ctx = canvas.getContext("2d"); probes = { ink: el.ink, accent: el.accent }; width = 0; layout(); readColors(); pageVisible = document.visibilityState === "visible"; const resize = new ResizeObserver(() => layout()); resize.observe(root); const io = new IntersectionObserver(([entry]) => { inView = entry.isIntersecting; setAwake(); }); io.observe(root); const visibility = () => { pageVisible = document.visibilityState === "visible"; setAwake(); }; document.addEventListener("visibilitychange", visibility); const scheme = window.matchMedia("(prefers-color-scheme: dark)"); const recolor = () => { readColors(); wake(); }; scheme.addEventListener("change", recolor); const themeAttrs = new MutationObserver(recolor); themeAttrs.observe(document.documentElement, { attributes: true, attributeFilter: ["class", "data-theme", "style"] }); cleanups.push( () => resize.disconnect(), () => io.disconnect(), () => document.removeEventListener("visibilitychange", visibility), () => scheme.removeEventListener("change", recolor), () => themeAttrs.disconnect(), ); return () => { cancelAnimationFrame(raf); raf = 0; window.clearTimeout(ambientTimer); ambientTimer = 0; rings.length = 0; inView = false; cleanups.splice(0).forEach((fn) => fn()); root = canvas = null; ctx = null; probes = null; }; }, setOptions(next: Options) { const relayout = next.spacing !== options.spacing; if (next.paused || next.reduced !== options.reduced) rings.length = 0; options = next; if (relayout) layout(); scheduleAmbient(); wake(); }, setOnLand(fn: ((event: PulseEvent) => void) | null) { onLand = fn; }, land, }; } export interface PulseProps extends React.HTMLAttributes { /** Your feed. Each new id lands once as a ring; ids already there on mount count as history and don't. */ events?: PulseEvent[]; /** Events per minute it lands on its own while your feed is quiet. `0` turns it off. */ ambient?: number; /** Distance between dots, in px. */ spacing?: number; /** Draw the still grid and ignore new events. */ paused?: boolean; /** How fast a ring runs out from its point, in px per second. */ ringSpeed?: number; /** Seconds a ring takes to fade to nothing. */ ringDuration?: number; /** Classes that set the dots' color (a `text-*` color). Dots at rest draw it at low opacity. */ inkClassName?: string; /** Classes that set the color an `accent` event's ring paints (a `text-*` color). */ accentClassName?: string; /** Called when an event's ring starts, including the ones `ambient` lands. */ onLand?: (event: PulseEvent) => void; } export function Pulse({ events, ambient = TIMING.ambient, spacing = 18, paused = false, ringSpeed = TIMING.ringSpeed, ringDuration = TIMING.ringDuration, inkClassName, accentClassName, onLand, className, children, ...props }: PulseProps) { const rootRef = React.useRef(null); const canvasRef = React.useRef(null); const inkRef = React.useRef(null); const accentRef = React.useRef(null); const [pulse] = React.useState(createPulse); const reduced = useReduced(); React.useLayoutEffect(() => { const root = rootRef.current; const canvas = canvasRef.current; const ink = inkRef.current; const accent = accentRef.current; if (!root || !canvas || !ink || !accent) return; return pulse.connect({ root, canvas, ink, accent }); }, [pulse]); React.useEffect(() => { pulse.setOptions({ spacing, ambient, paused, ringSpeed: Math.max(1, ringSpeed), ringDuration: Math.max(0.05, ringDuration), reduced, }); }, [pulse, spacing, ambient, paused, ringSpeed, ringDuration, reduced]); const onLandRef = React.useRef(onLand); React.useEffect(() => { onLandRef.current = onLand; }); React.useEffect(() => { pulse.setOnLand((event) => onLandRef.current?.(event)); return () => pulse.setOnLand(null); }, [pulse]); // Land only the ids that weren't in the last list. The first list is history. const seenRef = React.useRef | null>(null); React.useEffect(() => { const list = events ?? []; const before = seenRef.current; seenRef.current = new Set(list.map((e) => e.id)); if (!before) return; for (const event of list) if (!before.has(event.id)) pulse.land(event); }, [pulse, events]); return (

); } ```