{
  "$schema": "https://ui.shadcn.com/schema/registry-item.json",
  "name": "scriber",
  "type": "registry:ui",
  "title": "Scriber",
  "description": "A tiny inline sparkline — line, gradient area, or micro-bars — that scores itself in left to right with a bright cooling tip, and can stream live data from the right with a breathing endpoint dot. Pure SVG, no chart library, no axes.",
  "dependencies": [],
  "registryDependencies": [
    "https://crucibleui.com/r/use-reduced-motion.json",
    "https://crucibleui.com/r/use-visibility-pause.json"
  ],
  "files": [
    {
      "path": "registry/default/data/scriber/scriber.tsx",
      "type": "registry:ui",
      "target": "components/crucible/scriber.tsx",
      "content": "\"use client\";\n\nimport * as React from \"react\";\n\nimport { cn } from \"@/lib/utils\";\nimport { useReducedMotion } from \"@/hooks/use-reduced-motion\";\nimport { useVisibilityPause } from \"@/hooks/use-visibility-pause\";\n\nexport type ScriberVariant = \"line\" | \"area\" | \"bars\";\n\nexport type ScriberEasing = \"linear\" | \"easeIn\" | \"easeOut\" | \"easeInOut\" | ((t: number) => number);\n\nexport interface ScriberColors {\n  /** Body stroke of the line (and bar fill). @default \"#e2e8f0\" */\n  stroke?: string;\n  /** Gradient fill swept beneath the `area` variant. @default the stroke color */\n  fill?: string;\n  /** Bright leading tip of the stroke while it draws. @default \"#ffffff\" */\n  tip?: string;\n  /** Endpoint (latest-value) dot. @default \"#f8fafc\" */\n  dot?: string;\n  /** Faint graphite track the stroke is scored into. @default \"rgba(148,163,184,0.16)\" */\n  track?: string;\n}\n\nexport interface ScriberProps extends Omit<React.ComponentPropsWithoutRef<\"span\">, \"children\"> {\n  /**\n   * Points to plot, in any numeric range (normalized internally).\n   * @default a seeded demo series (see `seed`)\n   */\n  data?: number[];\n  /** Chart geometry: a plain line, a gradient-filled area, or micro-bars. @default \"line\" */\n  variant?: ScriberVariant;\n  /** Stroke width in px. @default 1.5 */\n  strokeWidth?: number;\n  /** Direction the area gradient fades: bright at the line fading down, or reversed. @default \"down\" */\n  fillDirection?: \"down\" | \"up\";\n  /** Peak opacity of the area gradient where it meets the line. @default 0.22 */\n  fillOpacity?: number;\n  /** Seconds the trace takes to score in, left to right, once in view. `0` skips the draw. @default 1.2 */\n  drawDuration?: number;\n  /** Easing for the draw: a named curve or a custom `(t) => number`. @default \"easeOut\" */\n  drawEasing?: ScriberEasing;\n  /**\n   * Live streaming mode: after the initial draw, new points slide in from the\n   * right while old points slide off the left. Pass `true` for a seeded random\n   * walk, or a callback `(last, index) => next` generating each point.\n   * @default false\n   */\n  live?: boolean | ((last: number, index: number) => number);\n  /** Milliseconds between streamed points in live mode. @default 1000 */\n  interval?: number;\n  /** Number of points visible at once in live mode (the stream window). @default 32 */\n  windowSize?: number;\n  /** Show the latest-value marker dot (breathes at ~0.5 Hz while live). @default true */\n  endpointDot?: boolean;\n  /** Fixed `[min, max]` normalization bounds. @default auto from the visible data */\n  bounds?: [min: number, max: number];\n  /** Seed for the deterministic demo series and the default live walk. @default 11 */\n  seed?: number;\n  /** Palette overrides — graphite track, ice-white stroke by default. */\n  colors?: ScriberColors;\n  /** Freeze all animation (draw and live stream). @default false */\n  paused?: boolean;\n  /**\n   * Visually-hidden trend text for screen readers, e.g. \"up 12% over 30 days\".\n   * Without it the sparkline is decorative (`aria-hidden`).\n   */\n  label?: string;\n}\n\n/** Length of the bright leading segment, as a fraction of the whole path. */\nconst HOT = 0.085;\n\nconst EASINGS: Record<string, (t: number) => number> = {\n  linear: (t) => t,\n  easeIn: (t) => t * t * t,\n  easeOut: (t) => 1 - Math.pow(1 - t, 3),\n  easeInOut: (t) => (t < 0.5 ? 4 * t * t * t : 1 - Math.pow(-2 * t + 2, 3) / 2),\n};\n\nfunction clamp(v: number, lo: number, hi: number): number {\n  return Math.min(hi, Math.max(lo, v));\n}\n\nfunction round2(n: number): number {\n  return Math.round(n * 100) / 100;\n}\n\n/** Deterministic PRNG — seeded demo data must never hydration-mismatch. */\nfunction mulberry32(seed: number): () => number {\n  let a = seed >>> 0;\n  return () => {\n    a = (a + 0x6d2b79f5) | 0;\n    let t = Math.imul(a ^ (a >>> 15), 1 | a);\n    t = (t + Math.imul(t ^ (t >>> 7), 61 | t)) ^ t;\n    return ((t ^ (t >>> 14)) >>> 0) / 4294967296;\n  };\n}\n\n/** Seeded demo series: a gentle upward drift for static charts, a flat walk for live. */\nfunction demoSeries(seed: number, n: number, flat: boolean): number[] {\n  const rnd = mulberry32(seed);\n  const out: number[] = [];\n  let v = flat ? 0.5 : 0.32;\n  for (let i = 0; i < n; i++) {\n    v = clamp(v + (rnd() - (flat ? 0.5 : 0.44)) * 0.16, 0.06, 0.97);\n    out.push(round2(v));\n  }\n  return out;\n}\n\n/**\n * Scriber — a tiny inline sparkline that scores itself into the page like a\n * scriber cutting a line in metal: one confident left-to-right stroke with a\n * bright leading tip that cools to the body color behind it, the gradient fill\n * sweeping in beneath. In `live` mode new points stream in from the right while\n * old points slide off the left, the endpoint dot breathing at ~0.5 Hz. Pure\n * SVG — no axes, no legend, no chart library — sized for sentences, table\n * cells, and stat cards. Reduced motion renders the final fully-drawn path with\n * a static endpoint dot; rAF runs only while drawing or live, idle-silent\n * otherwise, and suspends offscreen.\n */\nexport function Scriber({\n  data,\n  variant = \"line\",\n  strokeWidth = 1.5,\n  fillDirection = \"down\",\n  fillOpacity = 0.22,\n  drawDuration = 1.2,\n  drawEasing = \"easeOut\",\n  live = false,\n  interval = 1000,\n  windowSize = 32,\n  endpointDot = true,\n  bounds,\n  seed = 11,\n  colors,\n  paused = false,\n  label,\n  className,\n  ...props\n}: ScriberProps) {\n  const reducedMotion = useReducedMotion();\n  const isLive = Boolean(live) && !reducedMotion;\n  const rawId = React.useId().replace(/[^a-zA-Z0-9-]/g, \"\");\n  const gradId = `scriber-grad-${rawId}`;\n  const clipId = `scriber-clip-${rawId}`;\n\n  const stroke = colors?.stroke ?? \"#e2e8f0\";\n  const fillColor = colors?.fill ?? stroke;\n  const tipColor = colors?.tip ?? \"#ffffff\";\n  const dotColor = colors?.dot ?? \"#f8fafc\";\n  const trackColor = colors?.track ?? \"rgba(148,163,184,0.16)\";\n  const dotR = Math.max(2, strokeWidth * 1.3);\n\n  // ---- data -----------------------------------------------------------------\n  const basePoints = React.useMemo(() => {\n    const src = data && data.length >= 2 ? data : demoSeries(seed, isLive ? Math.max(windowSize, 8) : 24, isLive);\n    // Live windows are left-padded to a fixed size so the slide geometry never\n    // has to grow — a short flat lead-in beats a gap at the right edge.\n    const arr = isLive\n      ? src.length >= windowSize\n        ? src.slice(-windowSize)\n        : [...Array<number>(windowSize - src.length).fill(src[0]), ...src]\n      : src;\n    return arr.length >= 2 ? arr : [arr[0] ?? 0.5, arr[0] ?? 0.5];\n  }, [data, seed, isLive, windowSize]);\n\n  const [streamed, setStreamed] = React.useState<number[] | null>(null);\n  const points = streamed ?? basePoints;\n  const pointsRef = React.useRef(points);\n  pointsRef.current = points;\n\n  React.useEffect(() => {\n    setStreamed(null);\n  }, [basePoints]);\n\n  // ---- sizing (svg has no viewBox: user units === CSS px) --------------------\n  const [size, setSize] = React.useState({ w: 120, h: 32 });\n\n  // ---- geometry ---------------------------------------------------------------\n  const geo = React.useMemo(() => {\n    const { w, h } = size;\n    const pad = Math.ceil(dotR + strokeWidth / 2 + 1);\n    const innerW = Math.max(1, w - pad * 2);\n    const innerH = Math.max(1, h - pad * 2);\n    const visible = isLive ? windowSize : points.length;\n    const step = innerW / Math.max(1, visible - 1);\n    let lo: number;\n    let hi: number;\n    if (bounds) {\n      [lo, hi] = bounds;\n    } else {\n      lo = Math.min(...points);\n      hi = Math.max(...points);\n    }\n    if (hi - lo < 1e-9) {\n      lo -= 0.5;\n      hi += 0.5;\n    }\n    const xs = points.map((_, i) => round2(pad + i * step));\n    const ys = points.map((v) => round2(pad + (1 - clamp((v - lo) / (hi - lo), 0, 1)) * innerH));\n    const dLine = xs.map((x, i) => `${i === 0 ? \"M\" : \"L\"}${x} ${ys[i]}`).join(\" \");\n    const baseY = round2(h - pad);\n    const dArea = `${dLine} L${xs[xs.length - 1]} ${baseY} L${xs[0]} ${baseY} Z`;\n    const barW = round2(Math.max(1.25, step * 0.55));\n    const bars = points.map((_, i) => {\n      const bh = round2(Math.max(0.75, baseY - ys[i]));\n      return { x: round2(xs[i] - barW / 2), y: round2(baseY - bh), w: barW, h: bh };\n    });\n    return { pad, step, xs, ys, dLine, dArea, baseY, bars };\n  }, [points, size, bounds, isLive, windowSize, strokeWidth, dotR]);\n\n  // ---- animation state --------------------------------------------------------\n  const [drawn, setDrawn] = React.useState(false);\n  const isDrawn = drawn || reducedMotion || drawDuration <= 0;\n\n  const groupRef = React.useRef<SVGGElement>(null);\n  const mainPathRef = React.useRef<SVGPathElement>(null);\n  const hotPathRef = React.useRef<SVGPathElement>(null);\n  const clipRectRef = React.useRef<SVGRectElement>(null);\n  const tipDotRef = React.useRef<SVGCircleElement>(null);\n  const tipHaloRef = React.useRef<SVGCircleElement>(null);\n  const dotRef = React.useRef<SVGCircleElement>(null);\n  const dotHaloRef = React.useRef<SVGCircleElement>(null);\n  const barRefs = React.useRef<(SVGRectElement | null)[]>([]);\n\n  const drawDoneRef = React.useRef(false);\n  const lastAddRef = React.useRef(0);\n  const lenCacheRef = React.useRef({ d: \"\", len: 0 });\n  const liveIndexRef = React.useRef(0);\n  const walkRef = React.useRef<{ rnd: () => number; lo: number; hi: number; span: number } | null>(null);\n\n  const ease = typeof drawEasing === \"function\" ? drawEasing : (EASINGS[drawEasing] ?? EASINGS.easeOut);\n\n  const appendPoint = () => {\n    const arr = pointsRef.current;\n    const last = arr[arr.length - 1] ?? 0.5;\n    let next: number;\n    if (typeof live === \"function\") {\n      next = live(last, liveIndexRef.current++);\n    } else {\n      if (!walkRef.current) {\n        const lo = bounds ? bounds[0] : Math.min(...arr);\n        const hi = bounds ? bounds[1] : Math.max(...arr);\n        const span = hi - lo || 1;\n        walkRef.current = { rnd: mulberry32((seed ^ 0x9e3779b9) >>> 0), lo: lo - span * 0.1, hi: hi + span * 0.1, span };\n      }\n      const wk = walkRef.current;\n      next = clamp(last + (wk.rnd() - 0.5) * wk.span * 0.35, wk.lo, wk.hi);\n    }\n    const nextArr = [...arr, next].slice(-(windowSize + 1));\n    pointsRef.current = nextArr;\n    setStreamed(nextArr);\n  };\n\n  /** One frame of the score-in: dashoffset frontier, hot tip, fill sweep, bar stagger. */\n  const drawFrame = (p: number) => {\n    if (variant === \"bars\") {\n      const n = geo.bars.length;\n      geo.bars.forEach((b, i) => {\n        const rect = barRefs.current[i];\n        if (!rect) return;\n        const bp = clamp((p * (n + 2.4) - i) / 2.4, 0, 1);\n        rect.setAttribute(\"y\", String(b.y + b.h * (1 - bp)));\n        rect.setAttribute(\"height\", String(Math.max(0.001, b.h * bp)));\n        rect.setAttribute(\"fill-opacity\", String(0.3 + 0.6 * bp));\n      });\n      return;\n    }\n    const main = mainPathRef.current;\n    main?.setAttribute(\"stroke-dashoffset\", String(1 - p));\n    const hot = hotPathRef.current;\n    const midDraw = p > 0.001 && p < 0.995;\n    if (hot) {\n      hot.setAttribute(\"stroke-dashoffset\", String(HOT - p));\n      hot.setAttribute(\"opacity\", midDraw ? \"0.9\" : \"0\");\n    }\n    clipRectRef.current?.setAttribute(\"width\", String(p * size.w));\n    if (main && tipDotRef.current) {\n      if (lenCacheRef.current.d !== geo.dLine) {\n        lenCacheRef.current = { d: geo.dLine, len: main.getTotalLength() };\n      }\n      const pt = main.getPointAtLength(Math.min(0.9995, p) * lenCacheRef.current.len);\n      tipDotRef.current.setAttribute(\"cx\", String(pt.x));\n      tipDotRef.current.setAttribute(\"cy\", String(pt.y));\n      tipDotRef.current.setAttribute(\"opacity\", midDraw ? \"1\" : \"0\");\n      if (tipHaloRef.current) {\n        tipHaloRef.current.setAttribute(\"cx\", String(pt.x));\n        tipHaloRef.current.setAttribute(\"cy\", String(pt.y));\n        tipHaloRef.current.setAttribute(\"opacity\", midDraw ? \"0.22\" : \"0\");\n      }\n    }\n  };\n\n  const tick = (elapsed: number) => {\n    // Defensive re-anchor in case the clock ever restarts below our last mark.\n    if (lastAddRef.current > elapsed) lastAddRef.current = elapsed;\n\n    if (!drawDoneRef.current) {\n      const raw = drawDuration > 0 ? Math.min(1, elapsed / drawDuration) : 1;\n      drawFrame(ease(clamp(raw, 0, 1)));\n      if (raw >= 1) {\n        drawDoneRef.current = true;\n        lastAddRef.current = elapsed;\n        setDrawn(true);\n        // Seed the first incoming point so the window is windowSize + 1 and\n        // the leftward slide is seamless from the first frame.\n        if (isLive) appendPoint();\n      }\n      return;\n    }\n    if (!isLive) return; // loop is paused by state; guard for the final frame\n\n    // Live switched on after a static draw (or the window was resized): top the\n    // buffer up to windowSize + 1 first so the slide never exposes a gap.\n    if (pointsRef.current.length <= windowSize) {\n      appendPoint();\n      lastAddRef.current = elapsed;\n      return;\n    }\n\n    const intervalS = Math.max(0.05, interval / 1000);\n    const phase = (elapsed - lastAddRef.current) / intervalS;\n\n    // Endpoint dot breathes at ~0.5 Hz while data is live.\n    const breath = Math.sin(elapsed * Math.PI);\n    dotRef.current?.setAttribute(\"r\", String(dotR * (1 + 0.22 * breath)));\n    dotHaloRef.current?.setAttribute(\"opacity\", String(0.16 + 0.1 * (0.5 + 0.5 * breath)));\n\n    if (phase >= 1) {\n      appendPoint();\n      lastAddRef.current = elapsed;\n      return; // skip the transform this frame; next frame reads fresh geometry\n    }\n    groupRef.current?.setAttribute(\"transform\", `translate(${-phase * geo.step} 0)`);\n    // The dot rides the incoming segment, pinned to the right edge.\n    const ys = geo.ys;\n    if (dotRef.current && ys.length >= 2) {\n      const cy = ys[ys.length - 2] + (ys[ys.length - 1] - ys[ys.length - 2]) * phase;\n      dotRef.current.setAttribute(\"cy\", String(cy));\n      dotHaloRef.current?.setAttribute(\"cy\", String(cy));\n    }\n  };\n\n  // Drives draw + live stream; starts in view, suspends offscreen and on hidden\n  // tabs, and goes fully idle once a static chart has finished drawing.\n  const containerRef = useVisibilityPause<HTMLSpanElement>(tick, {\n    paused: paused || reducedMotion || (drawn && !isLive),\n  });\n\n  React.useLayoutEffect(() => {\n    const el = containerRef.current;\n    if (!el) return;\n    const measure = () => {\n      const r = el.getBoundingClientRect();\n      if (r.width > 0 && r.height > 0) {\n        setSize((s) => (Math.abs(s.w - r.width) < 0.5 && Math.abs(s.h - r.height) < 0.5 ? s : { w: r.width, h: r.height }));\n      }\n    };\n    measure();\n    const ro = new ResizeObserver(measure);\n    ro.observe(el);\n    return () => ro.disconnect();\n    // eslint-disable-next-line react-hooks/exhaustive-deps\n  }, []);\n\n  // ---- render -------------------------------------------------------------------\n  const n = points.length;\n  const dotX = isLive ? size.w - geo.pad : geo.xs[n - 1];\n  const dotY = isLive ? (geo.ys[n - 2] ?? geo.ys[n - 1]) : geo.ys[n - 1];\n\n  return (\n    <span\n      ref={containerRef}\n      data-crucible=\"scriber\"\n      aria-hidden={label ? undefined : true}\n      className={cn(\"relative inline-block h-[1.25em] w-[6em] align-[-0.25em]\", className)}\n      {...props}\n    >\n      <svg className=\"block h-full w-full overflow-hidden\" aria-hidden focusable=\"false\">\n        {variant === \"area\" && (\n          <defs>\n            <linearGradient id={gradId} x1=\"0\" y1=\"0\" x2=\"0\" y2=\"1\">\n              <stop offset=\"0\" stopColor={fillColor} stopOpacity={fillDirection === \"down\" ? fillOpacity : 0} />\n              <stop offset=\"1\" stopColor={fillColor} stopOpacity={fillDirection === \"down\" ? 0 : fillOpacity} />\n            </linearGradient>\n            {!isDrawn && (\n              <clipPath id={clipId}>\n                <rect ref={clipRectRef} x=\"0\" y=\"0\" width={0} height={size.h} />\n              </clipPath>\n            )}\n          </defs>\n        )}\n\n        {variant === \"bars\" ? (\n          <>\n            <line x1={geo.pad} x2={size.w - geo.pad} y1={geo.baseY} y2={geo.baseY} stroke={trackColor} strokeWidth={1} />\n            <g ref={groupRef}>\n              {geo.bars.map((b, i) => (\n                <rect\n                  key={i}\n                  ref={(el) => {\n                    barRefs.current[i] = el;\n                  }}\n                  x={b.x}\n                  width={b.w}\n                  y={isDrawn ? b.y : geo.baseY}\n                  height={isDrawn ? b.h : 0.001}\n                  rx={Math.min(1, b.w / 2)}\n                  fill={stroke}\n                  fillOpacity={isDrawn ? (i === n - 1 ? 1 : 0.9) : 0}\n                />\n              ))}\n            </g>\n          </>\n        ) : (\n          <g ref={groupRef}>\n            {/* Graphite track the stroke is scored into. */}\n            <path d={geo.dLine} fill=\"none\" stroke={trackColor} strokeWidth={Math.max(1, strokeWidth - 0.25)} />\n            {variant === \"area\" && (\n              <path d={geo.dArea} fill={`url(#${gradId})`} clipPath={isDrawn ? undefined : `url(#${clipId})`} />\n            )}\n            <path\n              ref={mainPathRef}\n              d={geo.dLine}\n              fill=\"none\"\n              stroke={stroke}\n              strokeWidth={strokeWidth}\n              strokeLinecap=\"round\"\n              strokeLinejoin=\"round\"\n              pathLength={1}\n              {...(isDrawn ? {} : { strokeDasharray: \"1\", strokeDashoffset: 1 })}\n            />\n            {/* Freshly-scored heat: a short bright segment cooling to the body color. */}\n            {!isDrawn && (\n              <path\n                ref={hotPathRef}\n                d={geo.dLine}\n                fill=\"none\"\n                stroke={tipColor}\n                strokeWidth={strokeWidth + 0.5}\n                strokeLinecap=\"round\"\n                strokeLinejoin=\"round\"\n                pathLength={1}\n                strokeDasharray={`${HOT} 1`}\n                strokeDashoffset={HOT}\n                opacity={0}\n              />\n            )}\n          </g>\n        )}\n\n        {/* Pen tip riding the frontier while the stroke draws. */}\n        {!isDrawn && variant !== \"bars\" && (\n          <>\n            <circle ref={tipHaloRef} r={dotR * 2.4} fill={tipColor} opacity={0} />\n            <circle ref={tipDotRef} r={Math.max(1.5, strokeWidth * 0.9 + 0.6)} fill={tipColor} opacity={0} />\n          </>\n        )}\n\n        {/* Latest-value marker: static once drawn, breathing while live. */}\n        {endpointDot && isDrawn && (\n          <>\n            <circle ref={dotHaloRef} cx={dotX} cy={dotY} r={dotR * 2} fill={dotColor} opacity={isLive ? 0.18 : 0.14} />\n            <circle ref={dotRef} cx={dotX} cy={dotY} r={dotR} fill={dotColor} />\n          </>\n        )}\n      </svg>\n      {label ? <span className=\"sr-only\">{label}</span> : null}\n    </span>\n  );\n}\n"
    }
  ]
}