{/* A pool of shadow under the type, so pulses never cross a letter at full brightness. */}

Boots Linux in 1.8 seconds

Kestrel K1 is a four-core RISC-V board with 8 GB of LPDDR5 and two 2.5 GbE ports. $149, shipping in March.

); } ``` ### Busy pulses={2.5} for a board under load. Sometimes a whole bus fires at once, a word of data crossing in parallel. ```tsx import { Circuit } from "@/components/ui/circuit"; export default function CircuitStatus() { return (

Build farm, eu-west

38 of 40 busy

Queue: 7 jobs
Median wait: 42 s
Power: 11.2 kW

); } ``` ### Seed and density The same seed at the same size always routes the same board. density adds chips, bottom-layer traces and small parts. ```tsx import { Circuit } from "@/components/ui/circuit"; const boards = [ { seed: 3, density: 0.25 }, { seed: 21, density: 0.6 }, { seed: 48, density: 1 }, ]; export default function CircuitSeeds() { return (

{boards.map((board) => (

seed {board.seed}, density{" "} {board.density}

))}

); } ``` ### Quiet Few pulses, slow and dim, for a notice that shouldn't compete with its button. ```tsx import { Button } from "@/components/ui/button"; import { Circuit } from "@/components/ui/circuit"; export default function CircuitQuiet() { return (

Firmware 2.4 is ready for your K1

Fixes the 2.5 GbE link drop under load and cuts idle draw to 3.1 W. Takes about four minutes.

); } ``` ## API reference ### Circuit Two canvases that fill the nearest positioned parent: the board, drawn once per size, and the pulses on top. Accepts native div attributes. | Prop | Type | Default | Description | | --- | --- | --- | --- | | `color` | `NeonColor` | `inherited` | Color of the pulses, lit pins and warm chips. The copper takes a trace of it too. | | `seed` | `number` | `7` | Same seed and size, same board. | | `density` | `number` | `0.6` | How busy the board is, 0 to 1. | | `pulses` | `number` | `1` | How often pulses set off, as a multiplier. 0 sends none. | | `speed` | `number` | `1` | Speed multiplier for the pulses. 0 holds a still frame. | | `intensity` | `number` | `0.85` | Brightness of the pulses and the board, 0 to 1. | ## Accessibility - Decorative: rendered with aria-hidden and pointer-events: none. - Routing is deterministic: a seeded generator lays out chips and buses, and an occupancy grid keeps top-layer traces from crossing. Nothing random runs during render, so it's safe to server-render. - It pauses offscreen and in hidden tabs. Under prefers-reduced-motion it draws one still frame with a few pulses mid-flight. ## Source `components/ui/circuit.tsx` ```tsx "use client"; import * as React from "react"; import { cn } from "@/lib/utils"; import { neonVars, type NeonColor } from "@/lib/neon"; type Rgb = [number, number, number]; type Chip = { x: number; y: number; w: number; h: number; heat: number }; type Trace = { /** Flat x,y pairs, starting at the chip pin. */ pts: number[]; /** Cumulative length at each point. */ len: number[]; total: number; chip: number; bus: number; /** Ends on a via inside the board rather than running off the edge. */ via: boolean; flash: number; }; type Board = { chips: Chip[]; traces: Trace[]; buses: number[][]; /** Second-layer traces: dimmer, allowed to pass under the top layer. */ under: number[][]; vias: number[]; parts: number[]; }; type Pulse = { trace: number; s: number; speed: number; tail: number }; const PITCH = 8; const CELL = 4; const DEG45 = Math.PI / 4; const SPRITE = 48; function mulberry32(seed: number) { let a = seed >>> 0; return () => { a = (a + 0x6d2b79f5) >>> 0; let t = a; t = Math.imul(t ^ (t >>> 15), t | 1); t ^= t + Math.imul(t ^ (t >>> 7), t | 61); return ((t ^ (t >>> 14)) >>> 0) / 4294967296; }; } /** The theme's glow multiplier. A finite check, not `|| 1`, so 0 stays 0. */ function readGlow(node: Element) { const value = parseFloat(getComputedStyle(node).getPropertyValue("--neon-glow")); return Number.isFinite(value) ? Math.max(0, value) : 1; } // The canvas carries `color: rgb(var(--neon))`, so the resolved channels are one read away. function readRgb(node: HTMLElement): Rgb { const parts = getComputedStyle(node).color.match(/[\d.]+/g); if (!parts || parts.length < 3) return [34, 211, 238]; return [Number(parts[0]), Number(parts[1]), Number(parts[2])]; } const mix = (a: Rgb, b: Rgb, t: number) => a.map((v, i) => Math.round(v + (b[i] - v) * t)).join(" "); function haloSprite(rgb: Rgb) { const sprite = document.createElement("canvas"); sprite.width = sprite.height = SPRITE; const ctx = sprite.getContext("2d"); if (!ctx) return sprite; const c = SPRITE / 2; const gradient = ctx.createRadialGradient(c, c, 0, c, c, c); gradient.addColorStop(0, `rgb(${rgb.join(" ")} / 0.6)`); gradient.addColorStop(0.2, `rgb(${rgb.join(" ")} / 0.22)`); gradient.addColorStop(1, `rgb(${rgb.join(" ")} / 0)`); ctx.fillStyle = gradient; ctx.fillRect(0, 0, SPRITE, SPRITE); return sprite; } // Offsets a polyline sideways with mitered corners. At 45° bends this is exactly how a bus of // parallel traces keeps its spacing: the outer traces bend a little later than the inner ones. function offsetLine(pts: number[], offset: number) { const n = pts.length / 2; const out: number[] = []; const normal = (i: number) => { const dx = pts[i * 2 + 2] - pts[i * 2]; const dy = pts[i * 2 + 3] - pts[i * 2 + 1]; const l = Math.hypot(dx, dy) || 1; return [-dy / l, dx / l]; }; for (let i = 0; i < n; i++) { let nx: number; let ny: number; if (i === 0) [nx, ny] = normal(0); else if (i === n - 1) [nx, ny] = normal(n - 2); else { const [ax, ay] = normal(i - 1); const [bx, by] = normal(i); const mx = ax + bx; const my = ay + by; const ml = Math.hypot(mx, my) || 1; const scale = 1 / Math.max(0.5, (mx / ml) * ax + (my / ml) * ay); nx = (mx / ml) * scale; ny = (my / ml) * scale; } out.push(pts[i * 2] + nx * offset, pts[i * 2 + 1] + ny * offset); } return out; } function lengths(pts: number[]) { const len = [0]; for (let i = 2; i < pts.length; i += 2) { len.push(len[len.length - 1] + Math.hypot(pts[i] - pts[i - 2], pts[i + 1] - pts[i - 1])); } return len; } /** Shortens a polyline from its far end. */ function trimEnd(pts: number[], by: number) { const out = pts.slice(); let left = by; while (out.length > 4 && left > 0) { const n = out.length; const dx = out[n - 2] - out[n - 4]; const dy = out[n - 1] - out[n - 3]; const l = Math.hypot(dx, dy); if (l > left) { out[n - 2] -= (dx / l) * left; out[n - 1] -= (dy / l) * left; return out; } left -= l; out.length = n - 2; } return out; } function generate(width: number, height: number, seed: number, density: number): Board { const random = mulberry32(seed * 2654435761 + 11); const pick = (min: number, max: number) => min + random() * (max - min); const snap = (v: number) => Math.round(v / PITCH) * PITCH; const cols = Math.ceil(width / CELL) + 1; const rows = Math.ceil(height / CELL) + 1; const grid = new Uint8Array(cols * rows); const cellAt = (x: number, y: number) => { const i = Math.floor(x / CELL); const j = Math.floor(y / CELL); if (i < 0 || j < 0 || i >= cols || j >= rows) return -1; return j * cols + i; }; const block = (x: number, y: number, w: number, h: number) => { for (let yy = y; yy < y + h; yy += CELL / 2) { for (let xx = x; xx < x + w; xx += CELL / 2) { const c = cellAt(xx, yy); if (c >= 0) grid[c] = 1; } } }; const free = (x: number, y: number, w: number, h: number) => { for (let yy = y; yy < y + h; yy += CELL / 2) { for (let xx = x; xx < x + w; xx += CELL / 2) { if (grid[cellAt(xx, yy)] === 1) return false; } } return true; }; // Chips sit away from the middle, where a headline usually goes. const chips: Chip[] = []; // By area, with a floor by width so short, wide strips still get a row of chips. const wanted = Math.max( 1, Math.round(((width * height) / 220000) * (0.6 + density)), Math.round((width / 300) * (0.4 + density * 0.6)), ); for (let attempt = 0; attempt < 240 && chips.length < wanted; attempt++) { const w = snap(pick(56, 132)); const h = snap(pick(48, 112)); // Alternate halves so the board balances instead of clumping on one side. const half = chips.length % 2 === 0 ? 0 : 1; const lo = half === 0 ? 24 : width / 2; const hi = half === 0 ? width / 2 - w : width - w - 24; const x = snap(pick(lo, Math.max(lo, hi))); const y = snap(pick(24, height - h - 24)); // On narrow boards the clear zone spans the full width, so chips go above and below the copy. const cx = (x + w / 2 - width / 2) / Math.max(width * 0.34, Math.min(width * 0.5, 300)); const cy = (y + h / 2 - height / 2) / (height * (width < 560 ? 0.36 : 0.3)); if (cx * cx + cy * cy < 1 && attempt < 180) continue; if (!free(x - 72, y - 72, w + 144, h + 144)) continue; chips.push({ x, y, w, h, heat: 0 }); block(x - 6, y - 6, w + 12, h + 12); } const traces: Trace[] = []; const buses: number[][] = []; const vias: number[] = []; const inBounds = (x: number, y: number, pad: number) => x > -pad && y > -pad && x < width + pad && y < height + pad; chips.forEach((chip, chipIndex) => { const sides = [0, 1, 2, 3]; for (let i = 3; i > 0; i--) { const j = Math.floor(random() * (i + 1)); [sides[i], sides[j]] = [sides[j], sides[i]]; } sides.length = 2 + Math.floor(random() * 2.2); for (const side of sides) { const along = side % 2 === 0 ? chip.h : chip.w; const maxPins = Math.max(2, Math.floor((along - 12) / PITCH)); const pins = Math.max(2, Math.min(maxPins, Math.round(pick(3, 8)))); // Outward direction: right, down, left, up. let angle = (side * Math.PI) / 2; const ex = side === 0 ? chip.x + chip.w : side === 2 ? chip.x : chip.x + chip.w / 2; const ey = side === 1 ? chip.y + chip.h : side === 3 ? chip.y : chip.y + chip.h / 2; const shift = snap(pick(-1, 1) * Math.max(0, (along - pins * PITCH) / 2 - 8)); const startX = ex + (side % 2 === 1 ? shift : 0); const startY = ey + (side % 2 === 0 ? shift : 0); const offsets = Array.from({ length: pins }, (_, i) => (i - (pins - 1) / 2) * PITCH); const guard = [offsets[0] - PITCH, ...offsets, offsets[pins - 1] + PITCH]; const line = [startX, startY]; let x = startX; let y = startY; let ended = false; let offEdge = false; let travelled = 0; // Walks one segment, stopping early on a collision or at the board edge. const walk = (length: number) => { const dx = Math.cos(angle); const dy = Math.sin(angle); const nx = -dy; const ny = dx; let done = 0; for (let s = 2; s <= length; s += 2) { const px = x + dx * s; const py = y + dy * s; if (!inBounds(px, py, 6)) { offEdge = true; done = s + 24; break; } if (travelled + s > 10) { let hit = false; for (const o of guard) { const c = cellAt(px + nx * o, py + ny * o); if (c >= 0 && grid[c] === 1) { hit = true; break; } } if (hit) { done = Math.max(0, s - 10); ended = true; break; } } done = s; } if (done > 0) { x += dx * done; y += dy * done; travelled += done; line.push(x, y); } return done; }; walk(snap(pick(16, 72)) + 8); const turns = 1 + Math.floor(random() * 3); for (let t = 0; t < turns && !ended && !offEdge; t++) { const roll = random(); const sign = random() < 0.5 ? -1 : 1; if (roll < 0.6) { // A jog: 45° off, then back to the same heading. angle += sign * DEG45; if (walk(snap(pick(16, 72))) === 0 || ended || offEdge) break; angle -= sign * DEG45; } else if (roll < 0.85) { // A chamfered right angle. angle += sign * DEG45; if (walk(PITCH * (pins + 1)) === 0 || ended || offEdge) break; angle += sign * DEG45; } walk(snap(pick(40, 260))); } if (!ended && !offEdge) walk(snap(pick(24, 120))); if (travelled < 28) continue; // Claim the bus's footprint so later buses route around it. const centre = lengths(line); const total = centre[centre.length - 1]; for (const o of offsets) { const path = offsetLine(line, o); const len = lengths(path); for (let k = 1; k < len.length; k++) { const ax = path[k * 2 - 2]; const ay = path[k * 2 - 1]; const seg = len[k] - len[k - 1]; for (let s = 0; s <= seg; s += 2) { const c = cellAt(ax + ((path[k * 2] - ax) * s) / seg, ay + ((path[k * 2 + 1] - ay) * s) / seg); if (c >= 0) grid[c] = 1; } } } const busIndex = buses.length; const members: number[] = []; offsets.forEach((o, i) => { // Every other trace stops a little short, so the vias at the end stagger instead of touching. let path = offsetLine(line, o); if (!offEdge && i % 2 === 1) path = trimEnd(path, 9); const len = lengths(path); const end = path.length; const via = !offEdge && total > 0; if (via) vias.push(path[end - 2], path[end - 1]); members.push(traces.length); traces.push({ pts: path, len, total: len[len.length - 1], chip: chipIndex, bus: busIndex, via, flash: 0 }); }); buses.push(members); } }); // The bottom layer: single traces that pass under everything, each ending on two vias. const under: number[][] = []; const lone = Math.round(((width * height) / 26000) * density); for (let n = 0; n < lone; n++) { let x = snap(pick(0, width)); let y = snap(pick(0, height)); let angle = Math.floor(random() * 8) * DEG45; const path = [x, y]; const segments = 2 + Math.floor(random() * 2); for (let s = 0; s < segments; s++) { const length = snap(pick(24, 140)); x += Math.cos(angle) * length; y += Math.sin(angle) * length; path.push(x, y); angle += (random() < 0.5 ? -1 : 1) * DEG45; } if (chips.some((c) => path.some((v, i) => i % 2 === 0 && v > c.x - 8 && v < c.x + c.w + 8 && path[i + 1] > c.y - 8 && path[i + 1] < c.y + c.h + 8))) continue; under.push(path); } // Small two-pad parts (resistors, capacitors) wherever there's room. const parts: number[] = []; const partCount = Math.round(((width * height) / 70000) * density); for (let n = 0, tries = 0; n < partCount && tries < partCount * 8; tries++) { const vertical = random() < 0.5; const w = vertical ? 6 : 14; const h = vertical ? 14 : 6; const x = snap(pick(8, width - 24)); const y = snap(pick(8, height - 24)); if (!free(x - 6, y - 6, w + 12, h + 12)) continue; block(x - 4, y - 4, w + 8, h + 8); parts.push(x, y, w, h); n++; } return { chips, traces, buses, under, vias, parts }; } export interface CircuitProps extends Omit, "color" | "children"> { /** Color of the pulses and lit pins. Inherits `--neon-accent` when omitted. */ color?: NeonColor; /** Same seed and size, same board. */ seed?: number; /** How busy the board is, 0 to 1: chips, under-layer traces and small parts. */ density?: number; /** How often pulses set off, as a multiplier. 0 sends none. */ pulses?: number; /** Speed multiplier for the pulses. 0 holds still. */ speed?: number; /** Brightness of the pulses and the board, 0 to 1. */ intensity?: number; } /** * A background layer. Place it inside a `relative` parent; it fills it. */ const Circuit = React.forwardRef( ( { className, style, color, seed = 7, density = 0.6, pulses = 1, speed = 1, intensity = 0.85, ...props }, forwardedRef, ) => { const rootRef = React.useRef(null); const boardRef = React.useRef(null); const lightRef = React.useRef(null); React.useImperativeHandle(forwardedRef, () => rootRef.current as HTMLDivElement); const live = React.useRef({ seed, density, pulses, speed, intensity }); const recolor = React.useRef<() => void>(() => {}); const refresh = React.useRef<(rebuild: boolean) => void>(() => {}); React.useEffect(() => { const rebuild = live.current.seed !== seed || live.current.density !== density; live.current = { seed, density, pulses, speed, intensity }; refresh.current(rebuild); }, [seed, density, pulses, speed, intensity]); React.useEffect(() => { recolor.current(); }, [color]); React.useEffect(() => { const root = rootRef.current; const boardCanvas = boardRef.current; const lightCanvas = lightRef.current; if (!root || !boardCanvas || !lightCanvas || typeof ResizeObserver === "undefined") return; const paint = boardCanvas.getContext("2d"); const light = lightCanvas.getContext("2d"); if (!paint || !light) return; const motion = window.matchMedia("(prefers-reduced-motion: reduce)"); let random = mulberry32(live.current.seed); let board: Board = { chips: [], traces: [], buses: [], under: [], vias: [], parts: [] }; let width = 0; let height = 0; let rgb = readRgb(lightCanvas); let glow = readGlow(lightCanvas); let halo = haloSprite(rgb); let raf = 0; let last = 0; let inView = true; let nextPulse = 0.2; let pulseList: Pulse[] = []; const build = () => { board = generate(width, height, live.current.seed, Math.max(0, Math.min(1, live.current.density))); random = mulberry32(live.current.seed + 1); pulseList = []; }; const pointAt = (trace: Trace, s: number) => { const { pts, len } = trace; let k = 1; while (k < len.length - 1 && len[k] < s) k++; const seg = len[k] - len[k - 1] || 1; const t = Math.max(0, Math.min(1, (s - len[k - 1]) / seg)); return [pts[k * 2 - 2] + (pts[k * 2] - pts[k * 2 - 2]) * t, pts[k * 2 - 1] + (pts[k * 2 + 1] - pts[k * 2 - 1]) * t]; }; const polyline = (ctx: CanvasRenderingContext2D, pts: number[]) => { ctx.moveTo(pts[0], pts[1]); for (let i = 2; i < pts.length; i += 2) ctx.lineTo(pts[i], pts[i + 1]); }; const drawBoard = () => { const dpr = boardCanvas.width / Math.max(width, 1); paint.setTransform(dpr, 0, 0, dpr, 0, 0); paint.clearRect(0, 0, width, height); const level = Math.max(0, Math.min(1, live.current.intensity)); // Copper under solder mask: a cool grey that leans toward the color. const copper = mix([120, 132, 150], rgb, 0.3); paint.lineCap = "round"; paint.lineJoin = "round"; paint.strokeStyle = `rgb(${copper} / ${0.07 * (0.5 + level * 0.5)})`; paint.lineWidth = 1; paint.beginPath(); for (const path of board.under) polyline(paint, path); paint.stroke(); paint.fillStyle = `rgb(${copper} / ${0.1 * (0.5 + level * 0.5)})`; for (const path of board.under) { for (const i of [0, path.length - 2]) { paint.beginPath(); paint.arc(path[i], path[i + 1], 2, 0, Math.PI * 2); paint.fill(); } } paint.strokeStyle = `rgb(${copper} / ${0.2 * (0.5 + level * 0.5)})`; paint.lineWidth = 1.25; paint.beginPath(); for (const trace of board.traces) polyline(paint, trace.pts); paint.stroke(); // Vias: a plated ring around a drilled hole. paint.lineWidth = 1.2; paint.strokeStyle = `rgb(${copper} / ${0.36 * (0.5 + level * 0.5)})`; paint.fillStyle = "#05060a"; for (let i = 0; i < board.vias.length; i += 2) { paint.beginPath(); paint.arc(board.vias[i], board.vias[i + 1], 2.8, 0, Math.PI * 2); paint.fill(); paint.stroke(); } paint.fillStyle = `rgb(${copper} / ${0.22 * (0.5 + level * 0.5)})`; for (let i = 0; i < board.parts.length; i += 4) { const [x, y, w, h] = board.parts.slice(i, i + 4); if (w > h) { paint.fillRect(x, y, 4, h); paint.fillRect(x + w - 4, y, 4, h); } else { paint.fillRect(x, y, w, 4); paint.fillRect(x, y + h - 4, w, 4); } } for (const chip of board.chips) { const { x, y, w, h } = chip; // Silkscreen corner marks around the footprint. paint.strokeStyle = "rgb(255 255 255 / 0.1)"; paint.lineWidth = 1; paint.beginPath(); const m = 10; const k = 7; for (const [cx, cy, sx, sy] of [ [x - m, y - m, 1, 1], [x + w + m, y - m, -1, 1], [x - m, y + h + m, 1, -1], [x + w + m, y + h + m, -1, -1], ]) { paint.moveTo(cx + sx * k, cy); paint.lineTo(cx, cy); paint.lineTo(cx, cy + sy * k); } paint.stroke(); paint.fillStyle = "#0a0c12"; paint.strokeStyle = "rgb(255 255 255 / 0.14)"; paint.beginPath(); paint.roundRect?.(x + 0.5, y + 0.5, w - 1, h - 1, 3); paint.fill(); paint.stroke(); // Pin 1. paint.fillStyle = "rgb(255 255 255 / 0.16)"; paint.beginPath(); paint.arc(x + 8, y + 8, 2, 0, Math.PI * 2); paint.fill(); } // Pins: a short pad where each trace leaves its chip. paint.fillStyle = `rgb(${mix([150, 160, 178], rgb, 0.25)} / 0.32)`; for (const trace of board.traces) { const [x, y] = trace.pts; paint.fillRect(x - 1.5, y - 1.5, 3, 3); } }; const drawLight = () => { light.clearRect(0, 0, width, height); const level = Math.max(0, Math.min(1, live.current.intensity)); if (level === 0) return; const hot = mix(rgb, [255, 255, 255], 0.55); light.lineCap = "round"; light.lineJoin = "round"; for (const pulse of pulseList) { const trace = board.traces[pulse.trace]; const head = Math.max(0, pulse.s); const tailEnd = Math.min(trace.total, pulse.s + pulse.tail); if (tailEnd <= head) continue; const [hx, hy] = pointAt(trace, head); const [tx, ty] = pointAt(trace, tailEnd); const path = () => { light.beginPath(); light.moveTo(tx, ty); for (let k = trace.len.length - 1; k > 0; k--) { if (trace.len[k] < tailEnd && trace.len[k] > head) light.lineTo(trace.pts[k * 2], trace.pts[k * 2 + 1]); } light.lineTo(hx, hy); }; const gradient = (core: string, alpha: number) => { const g = light.createLinearGradient(tx, ty, hx, hy); g.addColorStop(0, `rgb(${core} / 0)`); g.addColorStop(1, `rgb(${core} / ${alpha})`); return g; }; if (glow > 0) { light.lineWidth = 5; light.strokeStyle = gradient(rgb.join(" "), Math.min(1, 0.3 * level * glow)); path(); light.stroke(); } light.lineWidth = 1.5; light.strokeStyle = gradient(hot, level); path(); light.stroke(); if (pulse.s > 0 && glow > 0) { const s = 30; light.globalAlpha = Math.min(1, level * glow); light.drawImage(halo, hx - s / 2, hy - s / 2, s, s); light.globalAlpha = 1; } } // Pins that just took a pulse, and chips warmed by the traffic. for (const trace of board.traces) { if (trace.flash < 0.02) continue; const [x, y] = trace.pts; if (glow > 0) { const s = 22; light.globalAlpha = Math.min(1, trace.flash * level * glow); light.drawImage(halo, x - s / 2, y - s / 2, s, s); light.globalAlpha = 1; } light.fillStyle = `rgb(${hot} / ${trace.flash * level})`; light.fillRect(x - 1.5, y - 1.5, 3, 3); } for (const chip of board.chips) { if (chip.heat < 0.02) continue; light.strokeStyle = `rgb(${rgb.join(" ")} / ${Math.min(0.7, chip.heat * 0.55) * level})`; light.lineWidth = 1; light.beginPath(); light.roundRect?.(chip.x + 0.5, chip.y + 0.5, chip.w - 1, chip.h - 1, 3); light.stroke(); if (glow > 0) { // The die under the lid, glowing faintly while it works. const cx = chip.x + chip.w / 2; const cy = chip.y + chip.h / 2; const r = Math.min(chip.w, chip.h) * 0.42; const g = light.createRadialGradient(cx, cy, 0, cx, cy, r); g.addColorStop(0, `rgb(${rgb.join(" ")} / ${Math.min(0.22, chip.heat * 0.2) * level * glow})`); g.addColorStop(1, `rgb(${rgb.join(" ")} / 0)`); light.fillStyle = g; light.fillRect(cx - r, cy - r, r * 2, r * 2); } } }; const launch = (trace: number, delay = 0) => { const t = board.traces[trace]; const pace = 150 + random() * 110; pulseList.push({ trace, s: t.total + delay * pace, speed: pace, tail: 46 + random() * 40 }); }; const advance = (dt: number) => { const pace = Math.max(0, live.current.speed); const rate = Math.max(0, live.current.pulses); if (rate > 0 && board.traces.length > 0) { nextPulse -= dt * pace; if (nextPulse <= 0) { const bus = board.buses[Math.floor(random() * board.buses.length)]; if (random() < 0.45) { // A whole bus fires: a word of data crossing in parallel, slightly skewed. const speedShared = 150 + random() * 110; const tail = 46 + random() * 30; bus.forEach((trace) => { const t = board.traces[trace]; pulseList.push({ trace, s: t.total + random() * 18, speed: speedShared, tail }); }); } else { launch(bus[Math.floor(random() * bus.length)]); } nextPulse = (0.25 + random() * 0.7) / rate; } } for (const pulse of pulseList) { const before = pulse.s; pulse.s -= pulse.speed * pace * dt; if (before > 0 && pulse.s <= 0) { const trace = board.traces[pulse.trace]; trace.flash = 1; const chip = board.chips[trace.chip]; chip.heat = Math.min(1, chip.heat + 0.22); } } pulseList = pulseList.filter((pulse) => pulse.s + pulse.tail > 0); const fade = Math.exp(-dt * 3.2); for (const trace of board.traces) trace.flash *= fade; const cool = Math.exp(-dt * 0.9); for (const chip of board.chips) chip.heat *= cool; }; // A still frame still shows the board at work: a few pulses mid-flight, one chip warm. const still = () => { random = mulberry32(live.current.seed + 1); pulseList = []; for (const chip of board.chips) chip.heat = 0; for (const trace of board.traces) trace.flash = 0; const count = Math.min(board.buses.length, 5); for (let i = 0; i < count; i++) { const bus = board.buses[Math.floor((i / count) * board.buses.length)]; const trace = board.traces[bus[Math.floor(random() * bus.length)]]; pulseList.push({ trace: board.traces.indexOf(trace), s: trace.total * (0.25 + random() * 0.5), speed: 0, tail: 70 }); } if (board.chips[0]) board.chips[0].heat = 0.8; }; const running = () => inView && !document.hidden && !motion.matches && width > 0 && live.current.speed > 0; const frame = (now: number) => { raf = 0; const dt = last ? Math.min((now - last) / 1000, 0.05) : 0; last = now; advance(dt); drawLight(); schedule(); }; const schedule = () => { if (!raf && running()) raf = requestAnimationFrame(frame); }; const sync = () => { if (running()) schedule(); else { cancelAnimationFrame(raf); raf = 0; last = 0; if (width === 0) return; if (motion.matches || live.current.speed <= 0) still(); drawLight(); } }; const resize = () => { const dpr = Math.min(window.devicePixelRatio || 1, 2); const nextWidth = root.clientWidth; const nextHeight = root.clientHeight; const changed = nextWidth !== width || nextHeight !== height; width = nextWidth; height = nextHeight; for (const canvas of [boardCanvas, lightCanvas]) { canvas.width = Math.round(width * dpr); canvas.height = Math.round(height * dpr); } light.setTransform(dpr, 0, 0, dpr, 0, 0); if (changed || board.traces.length === 0) build(); drawBoard(); sync(); }; recolor.current = () => { rgb = readRgb(lightCanvas); glow = readGlow(lightCanvas); halo = haloSprite(rgb); if (width > 0) { drawBoard(); if (!raf) drawLight(); } }; refresh.current = (rebuild) => { if (width === 0) return; if (rebuild) build(); drawBoard(); sync(); }; const onTransition = (event: TransitionEvent) => { if (event.target === lightCanvas) recolor.current(); }; const resizeObserver = new ResizeObserver(resize); let dprQuery: MediaQueryList | undefined; const onDpr = () => { resize(); watchDpr(); }; const watchDpr = () => { dprQuery?.removeEventListener?.("change", onDpr); dprQuery = window.matchMedia?.(`(resolution: ${window.devicePixelRatio || 1}dppx)`); dprQuery?.addEventListener?.("change", onDpr); }; watchDpr(); resizeObserver.observe(root); const intersection = typeof IntersectionObserver === "undefined" ? null : new IntersectionObserver(([entry]) => { inView = entry.isIntersecting; sync(); }); intersection?.observe(root); document.addEventListener("visibilitychange", sync); motion.addEventListener("change", sync); lightCanvas.addEventListener("transitionend", onTransition); return () => { cancelAnimationFrame(raf); resizeObserver.disconnect(); dprQuery?.removeEventListener?.("change", onDpr); intersection?.disconnect(); document.removeEventListener("visibilitychange", sync); motion.removeEventListener("change", sync); lightCanvas.removeEventListener("transitionend", onTransition); recolor.current = () => {}; refresh.current = () => {}; }; }, []); return (

); }, ); Circuit.displayName = "Circuit"; export { Circuit }; ```