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That process has no start/stop within a run — it is // a single continuous draw — which is exactly the shape most "job status" // widgets get wrong by pausing their idle animation while "waiting." // // TWO SEPARATE THINGS, deliberately not conflated: // - The THERMAL GRADIENT (bright/dense "molten" -> dim "set", left to // right) is a FIXED function of position along the bar. It represents // the pipeline's stages, and never itself animates — pausing it would // misrepresent a process stage as somehow reversible. // - The RIPPLE (a faint sine wobble riding the top edge, confined to the // still-molten first third and damped out by where the gradient has // mostly set) is what SCROLLS continuously at a constant rate. It is the // "alive at rest" signal: material is actively moving through the // pipeline right now, regardless of which stage is highlighted. // // Colour is luminance-only: every fill is a lerp between --ns-muted (t=0, // "set") and --foreground (t=1, "molten") — never a literal orange/red heat // colour. That mapping holds in both themes because --foreground is already // the theme's highest-density ink (near-white in dark, near-black in // light), so "hot" reads as "densest" in both, not as a hue. // // Optional `stages`/`activeStage` overlay fixed pipeline-stage tick marks // (queued/processing/done, etc.) at even x-fractions along the bar — the // ribbon's own gradient/ripple keeps running unconditionally underneath // regardless of which stage is active, per the real process never stopping // mid-draw. // --------------------------------------------------------------------------- type Vec3 = [number, number, number]; // Same parse+lerp idiom used elsewhere in this registry (house convention, // duplicated per component rather than shared). function parseColor(raw: string): Vec3 | null { const s = raw.trim(); if (s.startsWith("#")) { const hex = s.slice(1); if (hex.length === 3) { const r = parseInt(hex[0]! + hex[0], 16); const g = parseInt(hex[1]! + hex[1], 16); const b = parseInt(hex[2]! + hex[2], 16); return Number.isNaN(r + g + b) ? null : [r, g, b]; } if (hex.length >= 6) { const r = parseInt(hex.slice(0, 2), 16); const g = parseInt(hex.slice(2, 4), 16); const b = parseInt(hex.slice(4, 6), 16); return Number.isNaN(r + g + b) ? null : [r, g, b]; } return null; } const m = s.match(/rgba?\(\s*([\d.]+)[,\s]+([\d.]+)[,\s]+([\d.]+)/); return m ? [Number(m[1]), Number(m[2]), Number(m[3])] : null; } function lerpColor(a: Vec3, b: Vec3, t: number): Vec3 { const c = Math.min(1, Math.max(0, t)); return [ Math.round(a[0] + (b[0] - a[0]) * c), Math.round(a[1] + (b[1] - a[1]) * c), Math.round(a[2] + (b[2] - a[2]) * c), ]; } function rgbStr(v: Vec3, alpha = 1): string { return alpha >= 1 ? `rgb(${v[0]},${v[1]},${v[2]})` : `rgba(${v[0]},${v[1]},${v[2]},${alpha})`; } const SAMPLES = 64; // 1D luminance/ripple lookup across the ribbon's length const LAMBDA = 0.35; // exp decay constant, in ribbon-lengths — how fast "hot" gives way to "set" const T_FLOOR = 0.08; // luminance never fully bottoms out to pure --ns-muted const RIBBON_FRAC = 0.28; // ribbon band height as a fraction of container height const SCROLL_FRAC_PER_S = 0.08; // ripple scroll speed, fraction of container width per second const RIPPLE_WAVELEN_FRAC = 0.18; // ripple wavelength, fraction of container width const RIPPLE_AMP_FRAC = 0.09; // ripple amplitude, fraction of ribbon height const MOLTEN_ZONE = 0.34; // ripple envelope is ~0 past this fraction along the ribbon function luminanceAt(xFrac: number): number { return T_FLOOR + (1 - T_FLOOR) * Math.exp(-xFrac / LAMBDA); } // ripple envelope: full amplitude near the molten (left) edge, damped to 0 // by MOLTEN_ZONE — a raised-cosine falloff, not a hard cutoff. function rippleEnvelope(xFrac: number): number { if (xFrac >= MOLTEN_ZONE) return 0; const t = xFrac / MOLTEN_ZONE; return 0.5 * (1 + Math.cos(t * Math.PI)); } export interface FloatRibbonDrawProps { /** total component height in px; the ribbon band derives as 28% of this. Default 88. */ height?: number; /** optional ordered pipeline stage labels, drawn as fixed ticks along the bar */ stages?: string[]; /** index into `stages` that is currently active/lit. Omit for a purely ambient ribbon with no stage semantics. */ activeStage?: number; /** accessible label for the status region. Default "Processing pipeline" */ label?: string; /** extra classes merged onto the rendered root element */ className?: string; } export function FloatRibbonDraw({ height = 88, stages, activeStage, label = "Processing pipeline", className = "", }: FloatRibbonDrawProps) { const canvasRef = useRef(null); const [announce, setAnnounce] = useState(""); const lastAnnouncedRef = useRef(undefined); useEffect(() => { if (!stages || activeStage === undefined) return; if (lastAnnouncedRef.current === activeStage) return; lastAnnouncedRef.current = activeStage; const s = stages[activeStage]; if (s) setAnnounce(`Stage: ${s}`); // eslint-disable-next-line react-hooks/exhaustive-deps }, [activeStage, stages?.join("|")]); useEffect(() => { const canvas = canvasRef.current; if (!canvas) return; const ctx = canvas.getContext("2d"); if (!ctx) return; const reduced = window.matchMedia("(prefers-reduced-motion: reduce)").matches; let muted: Vec3 = [128, 128, 128]; let fg: Vec3 = [0, 0, 0]; let border: Vec3 = [128, 128, 128]; let borderAlpha = 1; const readTokens = () => { const root = getComputedStyle(document.documentElement); muted = parseColor(root.getPropertyValue("--ns-muted")) ?? muted; fg = parseColor(root.getPropertyValue("--foreground")) ?? fg; border = parseColor(root.getPropertyValue("--border")) ?? border; // --border ships at low alpha via its own token in some themes; if the // computed value carries no alpha channel, keep full opacity and let // the token's own colour do the (deliberately faint) work. const m = root.getPropertyValue("--border").match(/rgba?$[^)]*,\s*([\d.]+)\s*$/); borderAlpha = m ? Number(m[1]) : 1; }; let width = 0; let sized = false; let ribbonH = 0; const resize = () => { const rect = canvas.getBoundingClientRect(); if (rect.width < 2 || rect.height < 2) { sized = false; return; } width = rect.width; ribbonH = Math.max(4, height * RIBBON_FRAC); const dpr = Math.min(window.devicePixelRatio || 1, 2); canvas.width = Math.max(1, Math.round(rect.width * dpr)); canvas.height = Math.max(1, Math.round(rect.height * dpr)); ctx.setTransform(dpr, 0, 0, dpr, 0, 0); sized = true; }; // scrollPx: how far the ripple texture has travelled, in css px. Never // resets — the draw is a single continuous run. let scrollPx = 0; const draw = () => { if (!sized) return; const rect = canvas.getBoundingClientRect(); const h = rect.height; const top = (h - ribbonH) / 2; ctx.clearRect(0, 0, rect.width, h); // 1D sample lookup across the ribbon's length: luminance (fixed, a // function of x only) and ripple y-offset (a function of x and the // scroll phase), bilinearly interpolated between the SAMPLES points. const lum = new Float32Array(SAMPLES); const rip = new Float32Array(SAMPLES); const wavelenPx = Math.max(1, width * RIPPLE_WAVELEN_FRAC); const ampPx = ribbonH * RIPPLE_AMP_FRAC; for (let i = 0; i < SAMPLES; i++) { const xFrac = i / (SAMPLES - 1); lum[i] = luminanceAt(xFrac); const env = rippleEnvelope(xFrac); const xPx = xFrac * width; rip[i] = env * ampPx * Math.sin(((xPx + scrollPx) / wavelenPx) * Math.PI * 2); } const sampleAt = (arr: Float32Array, xFrac: number): number => { const pos = Math.min(SAMPLES - 1, Math.max(0, xFrac * (SAMPLES - 1))); const i0 = Math.floor(pos); const i1 = Math.min(SAMPLES - 1, i0 + 1); const f = pos - i0; const a = arr[i0] ?? 0; const b = arr[i1] ?? 0; return a + (b - a) * f; }; // gradient fill along the ribbon's length, stopped at 12 points from // the pre-sampled luminance curve (the curve is exponential, not // linear, so a 2-stop canvas gradient would misrepresent it). const grad = ctx.createLinearGradient(0, 0, width, 0); const STOPS = 12; for (let s = 0; s <= STOPS; s++) { const xFrac = s / STOPS; const t = sampleAt(lum, xFrac); grad.addColorStop(xFrac, rgbStr(lerpColor(muted, fg, t))); } ctx.beginPath(); ctx.moveTo(0, top + sampleAt(rip, 0)); const STEP = 2; // px, top-edge ripple polyline resolution for (let x = 0; x <= width; x += STEP) { const xFrac = x / width; ctx.lineTo(x, top + sampleAt(rip, xFrac)); } ctx.lineTo(width, top + ribbonH); ctx.lineTo(0, top + ribbonH); ctx.closePath(); ctx.fillStyle = grad; ctx.fill(); // a thin --border rule under the full ribbon length, keeping the // "set" (right, low-luminance) end from disappearing into --surface // in light theme. ctx.beginPath(); ctx.moveTo(0, top + ribbonH + 0.5); ctx.lineTo(width, top + ribbonH + 0.5); ctx.lineWidth = 1; ctx.strokeStyle = rgbStr(border, borderAlpha); ctx.stroke(); // fixed pipeline-stage ticks, if provided — luminance only, never // accent, drawn on top of the ribbon at even x-fractions. if (stages && stages.length > 0) { for (let i = 0; i < stages.length; i++) { const xFrac = stages.length > 1 ? i / (stages.length - 1) : 0.5; const x = xFrac * width; const active = activeStage === i; ctx.fillStyle = rgbStr(active ? fg : muted, active ? 0.9 : 0.55); const tickH = active ? ribbonH * 0.55 : ribbonH * 0.35; ctx.fillRect(Math.round(x - 0.5), top + (ribbonH - tickH) / 2, 1, tickH); } } }; let raf = 0; let last = 0; let visible = true; const loop = (now: number) => { if (!visible || document.hidden) { raf = 0; return; } const dtMs = last ? Math.min(250, now - last) : 1000 / 60; last = now; scrollPx += width * SCROLL_FRAC_PER_S * (dtMs / 1000); draw(); raf = requestAnimationFrame(loop); }; const start = () => { if (raf || reduced) return; last = 0; raf = requestAnimationFrame(loop); }; const stop = () => { cancelAnimationFrame(raf); raf = 0; }; const mo = new MutationObserver(() => { readTokens(); if (reduced) draw(); }); mo.observe(document.documentElement, { attributes: true, attributeFilter: ["class"] }); let resizeTimer: ReturnType | null = null; const onResize = () => { if (resizeTimer) clearTimeout(resizeTimer); resizeTimer = setTimeout(() => { resizeTimer = null; readTokens(); resize(); draw(); }, 120); }; const ro = new ResizeObserver(onResize); ro.observe(canvas); const io = new IntersectionObserver( (entries) => { visible = entries[0]?.isIntersecting ?? true; if (visible) start(); else stop(); }, { threshold: 0 } ); io.observe(canvas); const onVis = () => { if (document.hidden) stop(); else if (visible) start(); }; document.addEventListener("visibilitychange", onVis); // no paint before the first token read readTokens(); resize(); if (reduced) { // freeze at scroll-phase 0 — the ripple's most evenly-spread crest // layout across the molten zone, not an arbitrary mid-scroll moment. scrollPx = 0; draw(); } else { draw(); start(); } return () => { stop(); if (resizeTimer) clearTimeout(resizeTimer); mo.disconnect(); ro.disconnect(); io.disconnect(); document.removeEventListener("visibilitychange", onVis); }; // eslint-disable-next-line react-hooks/exhaustive-deps }, [height, stages?.join("|"), activeStage]); return (

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