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A vector beam has no shutter and no pixel grid, so brightness at // any point on the trace is a direct function of beam DWELL TIME: fast along // long straight runs (dimmer), slow at direction-change vertices and stroke // endpoints (brighter) — real vector-monitor beam physics, not a stylistic // choice. // // The beam retraces the wordmark on a fixed 36Hz cycle (matches the // commonly cited ~30-40Hz refresh of real vector arcade hardware under // moderate draw-list length). Each retrace fades the previous pass toward // the background token first, THEN draws the new pass additively/ // subtractively depending on theme direction (see COMPOSITE DIRECTION // below) — a short multi-frame phosphor trail, deliberately NOT // flyback-tear's whole-seconds broadcast-signal decay: this is a live, // continuously-refreshing beam, not a failing timebase. // // COMPOSITE DIRECTION IS THEME-AWARE, NOT A COLOUR SWAP. In dark theme // (bright foreground on a near-black background) a "glow" is genuinely // additive — brighter strokes should push toward white, so retrace passes // use `globalCompositeOperation: "lighter"`. In light theme the SAME // brighter-at-corners relationship has to read as MORE INK, not more white // — additive blending in light theme would wash dark strokes toward the // light background and invert the whole mechanic, so light theme retraces // with `"multiply"` instead. Which mode applies is decided at every token // read by comparing the relative luminance of --foreground and // --background, never by a class-name assumption. // // Beam jitter (simulated CRT deflection-coil hum) perturbs every vertex by // a small smooth per-vertex-phased sine, sampled from a continuous // simulation clock independent of the 36Hz retrace cadence (so its phase // keeps advancing between retraces even though only a retrace event ever // paints it). Pointer proximity locally boosts jitter amplitude near the // cursor and decays back over roughly a second once the pointer leaves — // brightness/jitter only, --ns-accent never appears anywhere in this // component. // --------------------------------------------------------------------------- // -- single-stroke vector font ----------------------------------------- // Each letter is a list of strokes; each stroke is a flat [x0,y0,x1,y1,...] // polyline in a 4-wide x 6-tall unit cell (Hershey-style: continuous pen-down // runs, pen lifted between separate strokes). Hand-authored geometric // approximation, not a traced copy of the historical Hershey glyph set. const STROKE_FONT: Record = { A: [[0, 6, 2, 0, 4, 6], [0.8, 3.6, 3.2, 3.6]], B: [ [0, 0, 0, 6], [0, 0, 2.8, 0, 4, 1.4, 2.8, 3, 0, 3], [0, 3, 2.8, 3, 4, 4.6, 2.8, 6, 0, 6], ], C: [[4, 1.2, 3, 0, 1, 0, 0, 1.6, 0, 4.4, 1, 6, 3, 6, 4, 4.8]], D: [[0, 0, 0, 6], [0, 0, 2.4, 0, 4, 1.6, 4, 4.4, 2.4, 6, 0, 6]], E: [[0, 0, 0, 6], [0, 0, 4, 0], [0, 3, 3, 3], [0, 6, 4, 6]], F: [[0, 0, 0, 6], [0, 0, 4, 0], [0, 3, 3, 3]], G: [[4, 1.2, 3, 0, 1, 0, 0, 1.6, 0, 4.4, 1, 6, 3, 6, 4, 4.8, 4, 3.4, 2.4, 3.4]], H: [[0, 0, 0, 6], [4, 0, 4, 6], [0, 3, 4, 3]], I: [[2, 0, 2, 6], [0.6, 0, 3.4, 0], [0.6, 6, 3.4, 6]], J: [[3, 0, 3, 4.4, 2, 6, 0.6, 5.6, 0, 4.4]], K: [[0, 0, 0, 6], [4, 0, 0, 3.2], [0, 3.2, 4, 6]], L: [[0, 0, 0, 6, 4, 6]], M: [[0, 6, 0, 0, 2, 3, 4, 0, 4, 6]], N: [[0, 6, 0, 0, 4, 6, 4, 0]], O: [[2, 0, 4, 1.6, 4, 4.4, 2, 6, 0, 4.4, 0, 1.6, 2, 0]], P: [[0, 0, 0, 6], [0, 0, 3, 0, 4, 1.6, 3, 3, 0, 3]], Q: [[2, 0, 4, 1.6, 4, 4.4, 2, 6, 0, 4.4, 0, 1.6, 2, 0], [2.2, 4, 4.2, 6.2]], R: [[0, 0, 0, 6], [0, 0, 3, 0, 4, 1.6, 3, 3, 0, 3], [0, 3, 4, 6]], S: [[4, 1, 3, 0, 1, 0, 0, 1, 0, 2.4, 1, 3, 3, 3, 4, 4, 4, 5, 3, 6, 1, 6, 0, 5]], T: [[0, 0, 4, 0], [2, 0, 2, 6]], U: [[0, 0, 0, 4.4, 2, 6, 4, 4.4, 4, 0]], V: [[0, 0, 2, 6, 4, 0]], W: [[0, 0, 1, 6, 2, 3, 3, 6, 4, 0]], X: [[0, 0, 4, 6], [4, 0, 0, 6]], Y: [[0, 0, 2, 3], [4, 0, 2, 3], [2, 3, 2, 6]], Z: [[0, 0, 4, 0, 0, 6, 4, 6]], "0": [[2, 0, 4, 1.6, 4, 4.4, 2, 6, 0, 4.4, 0, 1.6, 2, 0], [0.7, 5, 3.3, 1]], "1": [[1, 1, 2, 0, 2, 6], [1, 6, 3, 6]], "2": [[0, 1, 1, 0, 3, 0, 4, 1.2, 4, 2.2, 0, 6, 4, 6]], "3": [[0, 0.8, 1, 0, 3, 0, 4, 1.2, 3, 3, 1.5, 3, 3, 3, 4, 4.2, 3, 6, 1, 6, 0, 5.2]], "4": [[3, 0, 0, 4, 4, 4], [3, 0, 3, 6]], "5": [[4, 0, 0, 0, 0, 3, 2.5, 3, 4, 4, 4, 5, 2.5, 6, 0, 6]], "6": [[3.5, 0.5, 1.5, 0, 0, 1.6, 0, 4.4, 1.5, 6, 3, 6, 4, 4.6, 3.5, 3.2, 1, 3.2]], "7": [[0, 0, 4, 0, 1.5, 6]], "8": [ [2, 3, 0.6, 1.8, 1, 0, 3, 0, 3.4, 1.8, 2, 3], [2, 3, 0.6, 4.2, 1, 6, 3, 6, 3.4, 4.2, 2, 3], ], "9": [[3, 3.2, 1, 3.2, 0, 1.8, 0.8, 0.3, 2.2, 0, 3.5, 1, 4, 3, 4, 4.4, 2.5, 6, 1, 5.5]], " ": [], "-": [[0.5, 3, 3.5, 3]], }; const GLYPH_W = 4; // unit width of one glyph cell const GLYPH_H = 6; // unit height of one glyph cell const GLYPH_GAP = 1.4; // unit gap between glyphs — generous, strokes need room const REFRESH_HZ = 36; // full-wordmark retrace rate, real vector-arcade range const RETRACE_MS = 1000 / REFRESH_HZ; const DECAY = 0.85; // previous pass retained fraction per retrace const SPEED_MAX = 2200; // px/s-equivalent, long straight runs (dim baseline) const SPEED_MIN = 400; // px/s-equivalent, sharp corners/endpoints (bright) const BRIGHT_CAP = 3; // vertices cap at 3x the straight-run baseline const ALPHA_MIN = 0.32; // stroke alpha at straight-run baseline const ALPHA_MAX = 0.92; // stroke alpha at a corner/endpoint const JITTER_OMEGA = 6.1; // rad/s — simulated deflection-coil hum const JITTER_AMP = 1.5; // px, at rest const DISTURB_EXTRA_AMP = 4.5; // px, additional jitter at full disturbance const DISTURB_RADIUS_FRAC = 0.28; // fraction of min(w,h) the disturbance reaches const DISTURB_TAU = 0.35; // s — exponential decay constant after pointer leaves const SUBSTEP_PX = 6; // one drawn subsegment per this many px of stroke length, capped at 24 per segment interface Vertex { x: number; y: number; alpha: number; seedX: number; seedY: number; } function hexToRgb(hex: string): [number, number, number] | null { const h = hex.trim().replace("#", ""); const v = h.length === 3 ? h.split("").map((c) => c + c).join("") : h; if (v.length !== 6) return null; const num = Number.parseInt(v, 16); if (Number.isNaN(num)) return null; return [(num >> 16) & 255, (num >> 8) & 255, num & 255]; } function relLuminance(rgb: [number, number, number]): number { return 0.2126 * rgb[0] + 0.7152 * rgb[1] + 0.0722 * rgb[2]; } function cornerAlpha(prev: [number, number] | null, cur: [number, number], next: [number, number] | null): number { // endpoints (no prev or no next) dwell like a corner — the beam decelerates // to land a stroke and decelerates before lifting off it if (!prev || !next) { return ALPHA_MAX; } const inX = cur[0] - prev[0]; const inY = cur[1] - prev[1]; const outX = next[0] - cur[0]; const outY = next[1] - cur[1]; const inLen = Math.hypot(inX, inY) || 1; const outLen = Math.hypot(outX, outY) || 1; const dot = (inX / inLen) * (outX / outLen) + (inY / inLen) * (outY / outLen); const turn = Math.max(0, Math.min(1, (1 - dot) / 2)); // 0 straight .. 1 full reversal const speed = SPEED_MAX - turn * (SPEED_MAX - SPEED_MIN); const brightnessNorm = Math.max(1, Math.min(BRIGHT_CAP, SPEED_MAX / Math.max(speed, 1))); const t = (brightnessNorm - 1) / (BRIGHT_CAP - 1); return ALPHA_MIN + t * (ALPHA_MAX - ALPHA_MIN); } export interface HeroBeamGlyphProps { /** wordmark text; unsupported characters render as a blank cell */ text?: string; /** extra classes merged onto the rendered root element */ className?: string; /** optional content laid over the field (subheading, CTA) */ children?: ReactNode; } export function HeroBeamGlyph({ text = "SIGNAL", className = "", children, }: HeroBeamGlyphProps) { const canvasRef = useRef(null); useEffect(() => { const canvas = canvasRef.current; if (!canvas) return; const ctx = canvas.getContext("2d"); if (!ctx) return; const reducedQuery = window.matchMedia("(prefers-reduced-motion: reduce)"); let fg = ""; let bg = ""; let multiplyDirection = false; // true in light theme (dark ink on light ground) let tokensReady = false; let dpr = 1; let displayW = 0; let displayH = 0; let sized = false; // one Vertex[] per stroke, in resting (unjittered) world px space let strokes: Vertex[][] = []; let disposed = false; let raf = 0; let accMs = 0; let lastNow = 0; let simTime = 0; let cursorX = -1e5; let cursorY = -1e5; let disturbWeight = 0; const readTokens = () => { const cs = getComputedStyle(document.documentElement); const nextFg = cs.getPropertyValue("--foreground").trim(); const nextBg = cs.getPropertyValue("--background").trim(); if (!nextFg || !nextBg) return; fg = nextFg; bg = nextBg; const fgRgb = hexToRgb(fg); const bgRgb = hexToRgb(bg); if (fgRgb && bgRgb) { multiplyDirection = relLuminance(fgRgb) < relLuminance(bgRgb); } tokensReady = true; }; const buildGeometry = () => { if (!sized) return; const chars = Array.from(text.toUpperCase()); const cellStep = GLYPH_W + GLYPH_GAP; const totalUnitsW = Math.max(GLYPH_W, chars.length * cellStep - GLYPH_GAP); const minDim = Math.min(displayW, displayH); let scale = (minDim * 0.42) / GLYPH_H; let pxW = totalUnitsW * scale; if (pxW > displayW * 0.88) { scale *= (displayW * 0.88) / pxW; pxW = totalUnitsW * scale; } const originX = (displayW - pxW) / 2; const originY = (displayH - GLYPH_H * scale) / 2; const built: Vertex[][] = []; chars.forEach((ch, i) => { const glyphStrokes = STROKE_FONT[ch]; if (!glyphStrokes || glyphStrokes.length === 0) return; const gx = originX + i * cellStep * scale; for (const flat of glyphStrokes) { if (flat.length < 4) continue; const pts: [number, number][] = []; for (let p = 0; p < flat.length; p += 2) { pts.push([gx + flat[p] * scale, originY + flat[p + 1] * scale]); } const verts: Vertex[] = pts.map((pt, idx) => { const prev = idx > 0 ? pts[idx - 1] : null; const next = idx < pts.length - 1 ? pts[idx + 1] : null; return { x: pt[0], y: pt[1], alpha: cornerAlpha(prev, pt, next), seedX: Math.random() * Math.PI * 2, seedY: Math.random() * Math.PI * 2, }; }); built.push(verts); } }); strokes = built; }; const resize = () => { const rect = canvas.getBoundingClientRect(); if (rect.width < 2 || rect.height < 2) { sized = false; return; } dpr = Math.min(window.devicePixelRatio || 1, 2); displayW = rect.width; displayH = rect.height; canvas.width = Math.max(1, Math.round(displayW * dpr)); canvas.height = Math.max(1, Math.round(displayH * dpr)); ctx.setTransform(dpr, 0, 0, dpr, 0, 0); sized = true; buildGeometry(); }; const lineWidthFor = () => { const minDim = Math.min(displayW, displayH); return Math.max(1.1, Math.min(3.2, minDim * 0.0035)); }; // draws one retrace pass: fades the existing canvas toward `bg`, then // strokes the wordmark on top with a theme-appropriate composite mode const retrace = (t: number, jitterOn: boolean, includeFade: boolean) => { if (!sized || !tokensReady) return; // a trail retrace fades the previous pass toward `bg` by DECAY; a // fresh single-pass (reduced motion) fully resets to an opaque `bg` // fill instead, so there is never a leftover transparent pixel for // the theme-dependent composite mode below to blend against ctx.globalCompositeOperation = "source-over"; ctx.globalAlpha = includeFade ? 1 - DECAY : 1; ctx.fillStyle = bg; ctx.fillRect(0, 0, displayW, displayH); ctx.globalAlpha = 1; ctx.globalCompositeOperation = multiplyDirection ? "multiply" : "lighter"; ctx.strokeStyle = fg; ctx.lineWidth = lineWidthFor(); ctx.lineCap = "round"; ctx.lineJoin = "round"; const minDim = Math.min(displayW, displayH); const disturbRadius = minDim * DISTURB_RADIUS_FRAC; const disturbR2 = disturbRadius * disturbRadius; for (const verts of strokes) { for (let i = 0; i < verts.length - 1; i++) { const a = verts[i]; const b = verts[i + 1]; const segLen = Math.hypot(b.x - a.x, b.y - a.y); const steps = Math.max(1, Math.min(24, Math.round(segLen / SUBSTEP_PX))); let prevX = a.x; let prevY = a.y; if (jitterOn) { const localAmp = (v: Vertex) => { let amp = JITTER_AMP; if (disturbWeight > 0.001) { const dx = v.x - cursorX; const dy = v.y - cursorY; const d2 = dx * dx + dy * dy; const influence = Math.exp(-d2 / (2 * disturbR2)); amp += disturbWeight * influence * DISTURB_EXTRA_AMP; } return amp; }; const ampA = localAmp(a); const ampB = localAmp(b); prevX = a.x + ampA * Math.sin(t * JITTER_OMEGA + a.seedX); prevY = a.y + ampA * Math.sin(t * JITTER_OMEGA * 1.31 + a.seedY); for (let s = 1; s <= steps; s++) { const frac = s / steps; const bx = a.x + (b.x - a.x) * frac; const by = a.y + (b.y - a.y) * frac; const amp = ampA + (ampB - ampA) * frac; const jx = bx + amp * Math.sin(t * JITTER_OMEGA + a.seedX + frac * 0.3); const jy = by + amp * Math.sin(t * JITTER_OMEGA * 1.31 + a.seedY + frac * 0.3); const alpha = a.alpha + (b.alpha - a.alpha) * frac; ctx.globalAlpha = alpha; ctx.beginPath(); ctx.moveTo(prevX, prevY); ctx.lineTo(jx, jy); ctx.stroke(); prevX = jx; prevY = jy; } } else { for (let s = 1; s <= steps; s++) { const frac = s / steps; const bx = a.x + (b.x - a.x) * frac; const by = a.y + (b.y - a.y) * frac; const alpha = a.alpha + (b.alpha - a.alpha) * frac; ctx.globalAlpha = alpha; ctx.beginPath(); ctx.moveTo(prevX, prevY); ctx.lineTo(bx, by); ctx.stroke(); prevX = bx; prevY = by; } } } } ctx.globalAlpha = 1; ctx.globalCompositeOperation = "source-over"; }; let visible = true; let paused = false; const startLive = () => { if (paused || reducedQuery.matches) return; if (!raf) { lastNow = 0; raf = requestAnimationFrame(loop); } }; const stopLive = () => { cancelAnimationFrame(raf); raf = 0; }; function loop(now: number) { raf = 0; if (disposed || paused || !visible) return; const dtMs = lastNow ? Math.min(250, now - lastNow) : 1000 / 60; lastNow = now; const dtSec = dtMs / 1000; simTime += dtSec; disturbWeight *= Math.exp(-dtSec / DISTURB_TAU); accMs += dtMs; // fixed-timestep retrace accumulator: paints only on a real 36Hz // retrace boundary, capped so a long hidden-tab gap catches up at // most a handful of passes rather than bursting through hundreds let guard = 0; while (accMs >= RETRACE_MS && guard < 8) { accMs -= RETRACE_MS; retrace(simTime, true, true); guard++; } if (guard >= 8) accMs = 0; raf = requestAnimationFrame(loop); } const drawReducedFrame = () => { disturbWeight = 0; retrace(0, false, false); }; const applyMotionPref = () => { stopLive(); if (reducedQuery.matches) { drawReducedFrame(); } else if (visible) { accMs = 0; startLive(); } }; reducedQuery.addEventListener("change", applyMotionPref); const onPointerMove = (e: PointerEvent) => { const rect = canvas.getBoundingClientRect(); cursorX = e.clientX - rect.left; cursorY = e.clientY - rect.top; disturbWeight = 1; }; if (!reducedQuery.matches) { canvas.addEventListener("pointermove", onPointerMove); } const mo = new MutationObserver(() => { readTokens(); if (reducedQuery.matches) drawReducedFrame(); }); mo.observe(document.documentElement, { attributes: true, attributeFilter: ["class"] }); let resizeTimer: ReturnType | null = null; const ro = new ResizeObserver(() => { if (resizeTimer) clearTimeout(resizeTimer); resizeTimer = setTimeout(() => { resizeTimer = null; resize(); if (reducedQuery.matches) drawReducedFrame(); }, 120); }); ro.observe(canvas); const io = new IntersectionObserver((entries) => { visible = entries[0]?.isIntersecting ?? true; if (!reducedQuery.matches) { if (visible) startLive(); else stopLive(); } }); io.observe(canvas); const onVisibility = () => { if (document.hidden) { paused = true; stopLive(); } else { paused = false; if (visible && !reducedQuery.matches) startLive(); else if (reducedQuery.matches) drawReducedFrame(); } }; document.addEventListener("visibilitychange", onVisibility); // no paint before the first token read — this component draws its own // vector strokes, not text glyphs, so there is no webfont metric to // wait on the way hero-oscilloscope's box-drawing grid does readTokens(); resize(); if (reducedQuery.matches) { drawReducedFrame(); } else if (visible) { startLive(); } return () => { disposed = true; stopLive(); if (resizeTimer) clearTimeout(resizeTimer); ro.disconnect(); io.disconnect(); mo.disconnect(); reducedQuery.removeEventListener("change", applyMotionPref); canvas.removeEventListener("pointermove", onPointerMove); document.removeEventListener("visibilitychange", onVisibility); }; }, [text]); return (

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