{ "$schema": "https://ui.shadcn.com/schema/registry-item.json", "name": "string-art", "title": "String Art", "description": "Threads string a ring of pins times-table style while the multiplier morphs from cardioid to nephroid and beyond.", "dependencies": ["remotion"], "files": [ { "path": "registry/remocn/string-art/index.tsx", "content": "\"use client\";\n\nimport {\n AbsoluteFill,\n Easing,\n interpolate,\n useCurrentFrame,\n useVideoConfig,\n} from \"remotion\";\n\nexport type StringArtProps = {\n /** Pins around the ring. */\n pins?: number;\n /** Multiplier at the start (2 draws a cardioid). */\n from?: number;\n /** Multiplier at the end (3 is a nephroid, 4 a three-cusp epicycloid). */\n to?: number;\n /** Frames for the threads to be strung, one pin after another. */\n stringFrames?: number;\n /** Frames for the multiplier to drift from `from` to `to`. */\n morphFrames?: number;\n /** Length of the accent sweep, as a share of all threads; 0 disables. */\n sweep?: number;\n /** Pins per frame the accent sweep travels once the threads are strung. */\n sweepSpeed?: number;\n /** Thread opacity, 0 to 1. */\n threadOpacity?: number;\n /** Show the running multiplier in the corner. */\n showLabel?: boolean;\n speed?: number;\n background?: string;\n color?: string;\n accent?: string;\n};\n\nexport const stringArtDefaults: Required = {\n pins: 200,\n from: 2,\n to: 4,\n stringFrames: 60,\n morphFrames: 240,\n sweep: 0.08,\n sweepSpeed: 0.9,\n threadOpacity: 0.42,\n showLabel: true,\n speed: 1,\n background: \"#111111\",\n color: \"#FFFFFF\",\n accent: \"#E5322D\",\n};\n\nconst TAU = Math.PI * 2;\nconst MORPH_DELAY = 24;\n// Share of each integer step spent holding on the clean integer figure.\nconst HOLD = 0.3;\nconst SWEEP_BUCKETS = 4;\nconst fmt = (n: number) => Math.round(n * 10) / 10;\n\nexport function StringArt({\n pins = stringArtDefaults.pins,\n from = stringArtDefaults.from,\n to = stringArtDefaults.to,\n stringFrames: stringFramesProp = stringArtDefaults.stringFrames,\n morphFrames: morphFramesProp = stringArtDefaults.morphFrames,\n sweep = stringArtDefaults.sweep,\n sweepSpeed = stringArtDefaults.sweepSpeed,\n threadOpacity = stringArtDefaults.threadOpacity,\n showLabel = stringArtDefaults.showLabel,\n speed = stringArtDefaults.speed,\n background = stringArtDefaults.background,\n color = stringArtDefaults.color,\n accent = stringArtDefaults.accent,\n}: StringArtProps) {\n const frame = useCurrentFrame();\n const { width, height } = useVideoConfig();\n const n = Math.max(8, Math.round(pins));\n const unit = Math.min(width, height) / 720;\n const radius = Math.min(width, height) * 0.42;\n const cx = width / 2;\n const cy = height / 2;\n const time = frame * speed;\n // interpolate() needs a strictly increasing range.\n const stringFrames = Math.max(1, stringFramesProp);\n const morphFrames = Math.max(1, morphFramesProp);\n\n const strung = interpolate(time, [0, stringFrames], [0, n], {\n extrapolateLeft: \"clamp\",\n extrapolateRight: \"clamp\",\n easing: Easing.inOut(Easing.quad),\n });\n const morphStart = stringFrames + MORPH_DELAY;\n // The multiplier walks through each integer table (cardioid, nephroid, ...)\n // with an eased step and a short hold on every clean figure.\n const span = to - from;\n const steps = Math.max(1, Math.ceil(Math.abs(span) - 1e-6));\n const u =\n interpolate(time, [morphStart, morphStart + morphFrames], [0, steps], {\n extrapolateLeft: \"clamp\",\n extrapolateRight: \"clamp\",\n }) - 1e-9;\n const step = Math.max(0, Math.floor(u));\n const within = Easing.inOut(Easing.cubic)(\n Math.min(1, Math.max(0, (u - step) / (1 - HOLD))),\n );\n const k = from + (span * Math.min(steps, step + within)) / steps;\n\n // Pin 0 sits on the left so the cardioid cusp points left and the figure is\n // symmetric about the horizontal axis. Angles stay continuous in k, so the\n // pattern morphs smoothly instead of snapping between integer tables.\n const point = (index: number) => {\n const a = Math.PI + (TAU * index) / n;\n return { x: cx + Math.cos(a) * radius, y: cy + Math.sin(a) * radius };\n };\n const xy = (p: { x: number; y: number }) => `${fmt(p.x)} ${fmt(p.y)}`;\n\n let threads = \"\";\n const accents: string[] = new Array(SWEEP_BUCKETS).fill(\"\");\n const whole = Math.floor(strung);\n // The accent sweep rides the stringing head, then keeps circling the ring.\n const head = strung + Math.max(0, time - stringFrames) * sweepSpeed;\n const tail = Math.max(0, sweep) * n;\n for (let i = 0; i < Math.ceil(strung); i++) {\n const start = point(i);\n const end = point(k * i);\n // The thread being strung right now grows from its pin to the target.\n const f = i < whole ? 1 : strung - whole;\n const tip = {\n x: start.x + (end.x - start.x) * f,\n y: start.y + (end.y - start.y) * f,\n };\n const d = `M ${xy(start)} L ${xy(tip)} `;\n const behind = (((head - i) % n) + n) % n;\n if (tail > 0 && behind < tail) {\n accents[\n Math.min(SWEEP_BUCKETS - 1, Math.floor((behind / tail) * SWEEP_BUCKETS))\n ] += d;\n } else threads += d;\n }\n\n let pinDots = \"\";\n const pr = 1.6 * unit;\n for (let i = 0; i < n; i++) {\n const { x, y } = point(i);\n pinDots += `M ${fmt(x - pr)} ${fmt(y)} a ${fmt(pr)} ${fmt(pr)} 0 1 0 ${fmt(pr * 2)} 0 a ${fmt(pr)} ${fmt(pr)} 0 1 0 ${fmt(-pr * 2)} 0 `;\n }\n const pinsIn = interpolate(time, [0, 12], [0, 1], {\n extrapolateLeft: \"clamp\",\n extrapolateRight: \"clamp\",\n });\n const labelIn = interpolate(\n time,\n [stringFrames - 10, stringFrames + 6],\n [0, 1],\n {\n extrapolateLeft: \"clamp\",\n extrapolateRight: \"clamp\",\n },\n );\n\n return (\n \n \n \n \n \n {accents.map((d, b) => (\n \n ))}\n \n \n {showLabel ? (\n \n i → \n {k.toFixed(2)} · i mod {n}\n \n ) : null}\n \n );\n}\n", "type": "registry:component", "target": "components/remocn/string-art.tsx" } ], "type": "registry:component" }