# Model usage > An AI gateway dashboard: requests, tokens and spend, tokens by model over time, latency, a written summary, and a model table that focuses the chart. A shadcn/ui block from the [@overtrue](https://ui.overtrue.xyz/?utm_source=shadcn.exchange) registry, listed on [shadcn.exchange](https://shadcn.exchange/r/overtrue/model-usage). - Page, with a live preview: https://shadcn.exchange/r/overtrue/model-usage - Screenshot: https://shadcn.exchange/shot/overtrue/model-usage/light.png - Registry item: https://ui.overtrue.xyz/r/model-usage.json - Categories: blocks - Listed: 2026-10-28, source last changed 2026-10-28 ## Install ```bash npx shadcn@latest add https://shadcn.exchange/r/overtrue/model-usage.json ``` Run it in a project that has shadcn/ui set up. It adds the files below and installs what they depend on. ## Dependencies - npm packages: `@tabler/icons-react` ## Notes from the registry Documentation: https://ui.overtrue.xyz/blocks/model-usage. Requires an initialized shadcn/ui project with Tailwind CSS v4. ## Files ### `src/registry/overtrue/model-usage.tsx` ```tsx "use client"; import * as React from "react"; import { IconCalendarStats, IconSparkles } from "@tabler/icons-react"; import { cn } from "@/lib/utils"; import { NumberTicker } from "./number-ticker"; import { Sparkline } from "./sparkline"; import { DeltaBadge } from "./delta-badge"; import { StackedAreaChart, type StackedAreaAnnotation, } from "./stacked-area-chart"; import { LatencyHistogram } from "./latency-histogram"; import { InsightCard, type InsightSource } from "./insight-card"; export interface ModelUsageModel { /** Field name for this model in each `usage` row. */ id: string; label: string; /** Provider or deployment, shown under the name. */ provider?: string; color?: string; requests: number; inputTokens: number; outputTokens: number; /** Spend for the period, in currency units. */ cost: number; /** 95th percentile latency in milliseconds. */ p95: number; /** Failed requests as a fraction, e.g. 0.004 for 0.4%. */ errorRate: number; } export interface ModelUsageMetric { id: string; label: string; value: number; format?: "number" | "compact" | "currency" | "milliseconds"; /** Fractional change against the previous period. */ change?: number; /** Lower is better, e.g. spend or latency. */ invert?: boolean; history?: number[]; hint?: string; } export interface ModelUsageData { title: string; period: string; currency?: string; /** Headline figures; the first is lit as the hero. */ metrics: ModelUsageMetric[]; /** One row per day: an `date` ISO string plus a token count per model id. */ usage: Record[]; models: ModelUsageModel[]; /** Markers on the usage chart, such as a routing change. */ annotations?: StackedAreaAnnotation[]; latency: { /** Gateway request latencies in milliseconds. */ values: number[]; compare?: number[]; threshold?: number; }; /** A written summary with optional `{{metric:…}}` and `{{cite:n}}` tokens. */ summary?: { text: string; sources?: InsightSource[] }; } export interface ModelUsageProps extends Omit, "title"> { data: ModelUsageData; actions?: React.ReactNode; locale?: string; /** Regenerate the summary with your own model. */ onRegenerateSummary?: () => void; /** Show the summary as it streams in. */ summaryStreaming?: boolean; } /** An AI gateway dashboard: requests, tokens and spend by model, latency, and a written summary. */ export function ModelUsage({ data, actions, locale = "en-US", onRegenerateSummary, summaryStreaming = false, className, ...props }: ModelUsageProps) { const currency = data.currency ?? "USD"; const [focused, setFocused] = React.useState(null); const formats = React.useMemo( () => ({ compact: new Intl.NumberFormat(locale, { notation: "compact", maximumFractionDigits: 1, }), number: new Intl.NumberFormat(locale), money: new Intl.NumberFormat(locale, { style: "currency", currency, maximumFractionDigits: 0, }), percent: new Intl.NumberFormat(locale, { style: "percent", maximumFractionDigits: 2, }), day: new Intl.DateTimeFormat(locale, { month: "short", day: "numeric" }), }), [currency, locale], ); const models = React.useMemo( () => [...data.models].sort((a, b) => b.cost - a.cost), [data.models], ); const series = data.models.map((model) => ({ key: model.id, label: model.label, color: model.color, })); const hidden = focused ? data.models.filter((model) => model.id !== focused).map((model) => model.id) : []; const maxCost = Math.max(...models.map((model) => model.cost), 1); const totalCost = models.reduce((sum, model) => sum + model.cost, 0); return (

{data.title}

{actions && (
{actions}
)}
{data.metrics.map((metric, index) => ( ))}
model.id === focused)?.label} only. Select it again in the table to show every model.` : "Input and output tokens per day, stacked by model" } data={data.usage} index="date" series={series} hiddenSeries={hidden} onHiddenSeriesChange={(next) => { const visible = data.models.filter((model) => !next.includes(model.id)); setFocused(visible.length === 1 ? visible[0].id : null); }} annotations={data.annotations} height={300} valueFormatter={(value) => formats.compact.format(value)} xFormatter={(value) => formats.day.format(value instanceof Date ? value : new Date(String(value))) } />
{data.summary && (

Models

Select a model to show it alone on the chart.

{formats.money.format(totalCost)} across {models.length} models

{models.map((model) => { const index = data.models.indexOf(model); const color = model.color ?? `var(--color-chart-${(index % 5) + 1})`; const tokens = model.inputTokens + model.outputTokens; const active = focused === model.id; const dimmed = focused !== null && !active; return ( ); })}
Model Requests Tokens in · out Spend p95 Errors
{formats.compact.format(model.requests)}
{formats.compact.format(tokens)}
{formats.money.format(model.cost)} {formats.percent.format(model.cost / Math.max(totalCost, 1))}
{formats.number.format(Math.round(model.p95))} ms = 0.01 ? "text-rose-600 dark:text-rose-400" : model.errorRate >= 0.005 ? "text-amber-700 dark:text-amber-300" : "text-muted-foreground", )} > {model.errorRate >= 0.005 && (
); } function UsageMetric({ metric, hero, locale, currency, }: { metric: ModelUsageMetric; hero: boolean; locale: string; currency: string; }) { const format = metric.format ?? "number"; return (
{metric.label}
{metric.change !== undefined && ( )}
ms ) : undefined } className={cn( "font-semibold tracking-[-0.035em] tabular-nums", hero ? "text-3xl" : "text-2xl", )} /> {metric.hint && ( {metric.hint} )}
{metric.history && metric.history.length > 1 && ( = 0) !== Boolean(metric.invert) ? "text-primary" : "text-rose-500 dark:text-rose-400", )} filled endpoint /> )}
); } /* Sample data --------------------------------------------------------------- */ function random(seed: number) { return () => { seed |= 0; seed = (seed + 0x6d2b79f5) | 0; let t = Math.imul(seed ^ (seed >>> 15), 1 | seed); t = (t + Math.imul(t ^ (t >>> 7), 61 | t)) ^ t; return ((t ^ (t >>> 14)) >>> 0) / 4294967296; }; } function logNormal(count: number, median: number, spread: number, seed: number) { const next = random(seed); return Array.from({ length: count }, () => { const u = Math.max(next(), 1e-9); const v = next(); const z = Math.sqrt(-2 * Math.log(u)) * Math.cos(2 * Math.PI * v); return Math.round(median * Math.exp(spread * z)); }); } const sampleModels = [ // id, label, provider, base daily tokens, $ per million tokens, output share, tokens per request, p95, error rate ["large", "Atlas Large", "atlas/large-2026-08", 26_000_000, 15, 0.32, 3100, 2840, 0.0062], ["medium", "Atlas Medium", "atlas/medium-2026-06", 42_000_000, 3, 0.28, 1900, 1320, 0.0031], ["small", "Atlas Small", "atlas/small-2026-09", 31_000_000, 0.6, 0.24, 1100, 610, 0.0018], ["embed", "Embed v3", "atlas/embed-v3", 54_000_000, 0.1, 0, 420, 140, 0.0004], ["rerank", "Rerank v2", "atlas/rerank-v2", 13_000_000, 1, 0, 680, 210, 0.0011], ] as const; function buildSampleUsage(): ModelUsageData { const next = random(42); const days = 30; const routedOn = 17; // Summaries move from Large to Small on this day. const usage: Record[] = []; const totals: Record = {}; for (let day = 0; day < days; day++) { const date = new Date(Date.UTC(2026, 8, 13 + day)); const weekday = date.getUTCDay(); const weekend = weekday === 0 || weekday === 6 ? 0.58 : 1; const growth = 1 + day * 0.012; const row: Record = { date: date.toISOString().slice(0, 10) }; for (const [id, , , base] of sampleModels) { let value = base * weekend * growth * (0.9 + next() * 0.2); if (id === "large" && day >= routedOn) value *= 0.46; if (id === "small" && day >= routedOn) value *= 1.55; row[id] = Math.round(value); totals[id] = (totals[id] ?? 0) + Math.round(value); } usage.push(row); } const models: ModelUsageModel[] = sampleModels.map( ([id, label, provider, , price, outputShare, perRequest, p95, errorRate]) => { const tokens = totals[id]; return { id, label, provider, requests: Math.round(tokens / perRequest), inputTokens: Math.round(tokens * (1 - outputShare)), outputTokens: Math.round(tokens * outputShare), cost: Math.round((tokens / 1_000_000) * price), p95, errorRate, }; }, ); const sum = (pick: (model: ModelUsageModel) => number) => models.reduce((total, model) => total + pick(model), 0); const dailyTotals = usage.map((row) => sampleModels.reduce((total, [id]) => total + Number(row[id]), 0), ); const weekly = (values: number[]) => Array.from({ length: Math.ceil(values.length / 3) }, (_, index) => values.slice(index * 3, index * 3 + 3).reduce((a, b) => a + b, 0), ); const dailyCost = usage.map((row) => sampleModels.reduce( (total, [id, , , , price]) => total + (Number(row[id]) / 1_000_000) * price, 0, ), ); const latency = [ ...logNormal(2600, 420, 0.7, 7), ...logNormal(600, 1900, 0.35, 9), ]; return { title: "AI gateway", period: "Sep 13 – Oct 12, 2026", currency: "USD", metrics: [ { id: "requests", label: "Requests", value: sum((model) => model.requests), format: "compact", change: 0.214, hint: "Across five models", history: weekly(dailyTotals.map((tokens) => tokens / 1500)), }, { id: "tokens", label: "Tokens", value: sum((model) => model.inputTokens + model.outputTokens), format: "compact", change: 0.187, hint: "Input and output", history: weekly(dailyTotals), }, { id: "spend", label: "Spend", value: sum((model) => model.cost), format: "currency", change: -0.082, invert: true, hint: "After routing summaries to Atlas Small", history: weekly(dailyCost), }, { id: "p95", label: "p95 latency", value: 1640, format: "milliseconds", change: -0.126, invert: true, hint: "Gateway, end to end", history: [2010, 1980, 1940, 1890, 1860, 1720, 1690, 1660, 1650, 1640], }, ], usage, models, annotations: [ { x: usage[routedOn].date as string, label: "Summaries routed to Atlas Small" }, ], latency: { values: latency, compare: [...logNormal(2600, 470, 0.72, 11), ...logNormal(700, 2300, 0.35, 13)], threshold: 2500, }, summary: { text: "Spend fell {{metric:Spend|-8.2%|positive}} while requests grew {{metric:Requests|+21.4%|neutral}}, because summaries moved from Atlas Large to Atlas Small on Sep 30 {{cite:1}}. Atlas Small now handles a third of all generation traffic at {{metric:p95|610 ms|positive}} {{cite:2}}. Atlas Large still has the highest error rate, mostly timeouts on long contexts {{cite:3}}; capping its context at 64K tokens would remove most of them.", sources: [ { id: "1", label: "Routing rule summaries-v4" }, { id: "2", label: "Gateway latency" }, { id: "3", label: "Error log, Atlas Large" }, ], }, }; } /** Fictional AI gateway usage for Acme Studio, for demos and tests. */ export const sampleModelUsage: ModelUsageData = buildSampleUsage(); ``` ### `src/registry/overtrue/number-ticker.tsx` ```tsx "use client"; import { useEffect, useLayoutEffect, useMemo, useState, useSyncExternalStore, type ComponentProps, type CSSProperties, type ReactNode, } from "react"; import { cn } from "@/lib/utils"; export type NumberTickerFormat = "number" | "currency" | "percent" | "compact"; export interface NumberTickerProps extends Omit< ComponentProps<"span">, "children" | "prefix" > { value: number; /** Preset Intl options. Percent expects a fraction: 0.124 renders 12.4%. */ format?: NumberTickerFormat; /** Merged over the preset, e.g. `{ maximumFractionDigits: 0 }`. */ formatOptions?: Intl.NumberFormatOptions; locale?: string; /** ISO 4217 code used by the currency preset. */ currency?: string; prefix?: ReactNode; suffix?: ReactNode; /** Roll duration in milliseconds. */ duration?: number; /** Tint the number briefly: emerald when it rises, red when it falls. */ highlightChanges?: boolean; /** Roll up from zero on first mount instead of rendering the value directly. */ animateOnMount?: boolean; } // Each column is a wheel of five 0–9 runs. It rests in the middle run, so two // rapid changes in either direction can always roll forward or backward. const CELLS = 50; const REST = 20; const STAGGER = 32; const MAX_STAGGER = 224; const SLIDE_EASE = "cubic-bezier(0.2, 1, 0.32, 1)"; // Overshoot scales with distance, so longer rolls get a gentler curve: every // wheel settles past its digit by about a tenth of a cell, whatever it travelled. const SETTLE = [1.534, 1.368, 1.3, 1.262, 1.236, 1.217, 1.203, 1.191, 1.181]; const rollEase = (cells: number) => `cubic-bezier(0.2, ${SETTLE[Math.min(Math.max(Math.abs(cells), 1), 9) - 1]}, 0.32, 1)`; const SIZE_EASE = "cubic-bezier(0.32, 0.72, 0, 1)"; const REDUCED_QUERY = "(prefers-reduced-motion: reduce)"; function subscribeReducedMotion(callback: () => void) { const query = window.matchMedia(REDUCED_QUERY); query.addEventListener("change", callback); return () => query.removeEventListener("change", callback); } function usePrefersReducedMotion() { return useSyncExternalStore( subscribeReducedMotion, () => window.matchMedia(REDUCED_QUERY).matches, () => false, ); } const presets: Record< NumberTickerFormat, (currency: string) => Intl.NumberFormatOptions > = { number: () => ({}), currency: (currency) => ({ style: "currency", currency }), percent: () => ({ style: "percent", minimumFractionDigits: 1, maximumFractionDigits: 1, }), compact: () => ({ notation: "compact", maximumSignificantDigits: 3 }), }; interface TickerFormatter { format: Intl.NumberFormat; /** The locale's digit glyphs, so Arabic-Indic or Devanagari numerals roll too. */ glyphs: string[]; /** One padded cell per wheel position, created once and shared by every column. */ cells: ReactNode[]; } const formatterCache = new Map(); function resolveOptions( format: NumberTickerFormat, currency: string, overrides: Intl.NumberFormatOptions | undefined, ): Intl.NumberFormatOptions { const options = { ...presets[format](currency), ...overrides }; // Keep a preset's fixed precision from conflicting with a partial override. const { minimumFractionDigits: min, maximumFractionDigits: max } = options; if (min !== undefined && max !== undefined && min > max) { if (overrides?.maximumFractionDigits !== undefined) options.minimumFractionDigits = max; else options.maximumFractionDigits = min; } return options; } function getFormatter( locale: string, options: Intl.NumberFormatOptions, ): TickerFormatter { const key = `${locale}|${JSON.stringify(options)}`; let entry = formatterCache.get(key); if (!entry) { let format: Intl.NumberFormat; try { format = new Intl.NumberFormat(locale, options); } catch { format = new Intl.NumberFormat("en-US"); } const digits = new Intl.NumberFormat(format.resolvedOptions().locale, { useGrouping: false, numberingSystem: format.resolvedOptions().numberingSystem, } as Intl.NumberFormatOptions); const glyphs = Array.from({ length: 10 }, (_, digit) => digits.format(digit), ); const cells = Array.from({ length: CELLS }, (_, cell) => ( {glyphs[cell % 10]} )); entry = { format, glyphs, cells }; formatterCache.set(key, entry); } return entry; } type Slot = | { key: string; kind: "digit"; digit: number; order: number } | { key: string; kind: "char"; char: string }; type Item = Slot & { phase: "idle" | "enter" | "exit" }; /** * Split a formatted number into keyed slots. Integer digits are keyed by place * value and fraction digits by position, so the ones column stays the ones * column when 999 becomes 1,000 and only the new leading columns enter. */ function toSlots(value: number, formatter: TickerFormatter) { if (!Number.isFinite(value)) { return { text: "—", slots: [{ key: "missing", kind: "char", char: "—" }] as Slot[], }; } const parts = formatter.format.formatToParts(value); const isDigit = (char: string) => formatter.glyphs.includes(char); let integerDigits = 0; for (const part of parts) if (part.type === "integer") for (const char of part.value) if (isDigit(char)) integerDigits++; const slots: Slot[] = []; const seen = new Map(); let integerIndex = 0; let fractionIndex = 0; const pushChar = (type: string, char: string) => { const count = seen.get(type) ?? 0; seen.set(type, count + 1); slots.push({ key: `${type}${count}:${char}`, kind: "char", char }); }; for (const part of parts) { if (part.type === "integer" || part.type === "fraction") { for (const char of part.value) { const digit = formatter.glyphs.indexOf(char); if (digit < 0) pushChar(part.type, char); else if (part.type === "integer") slots.push({ key: `i${integerDigits - 1 - integerIndex++}`, kind: "digit", digit, order: 0, }); else slots.push({ key: `f${fractionIndex++}`, kind: "digit", digit, order: 0, }); } } else if (part.type === "group") { slots.push({ key: `g${integerDigits - integerIndex}:${part.value}`, kind: "char", char: part.value, }); } else { pushChar(part.type, part.value); } } // Stagger from the rightmost digit outward, like a carry moving left. let order = 0; for (let i = slots.length - 1; i >= 0; i--) { const slot = slots[i]; if (slot.kind === "digit") slots[i] = { ...slot, order: order++ }; } return { text: parts.map((part) => part.value).join(""), slots }; } /** Keep removed slots in place for one transition so they can collapse out. */ function mergeSlots(previous: Item[], next: Slot[], animate: boolean): Item[] { const previousKeys = new Set(previous.map((item) => item.key)); const live: Item[] = next.map((slot) => ({ ...slot, phase: animate && !previousKeys.has(slot.key) ? "enter" : "idle", })); if (!animate) return live; const nextKeys = new Set(next.map((slot) => slot.key)); const leadingExits = new Map(); let pending: Item[] = []; for (const item of previous) { if (nextKeys.has(item.key)) { if (pending.length) leadingExits.set(item.key, pending); pending = []; } else if (item.phase !== "exit") { pending.push({ ...item, phase: "exit" }); } } const merged: Item[] = []; for (const item of live) { const exits = leadingExits.get(item.key); if (exits) merged.push(...exits); merged.push(item); } return merged.concat(pending); } function zeroed(slots: Slot[]): Slot[] { return slots.map((slot) => slot.kind === "digit" ? { ...slot, digit: 0 } : slot, ); } interface TickerState { signature: string; value: number; items: Item[]; direction: number; flash: "up" | "down" | null; version: number; } /** An odometer-style number: each digit rolls on its own wheel when `value` changes. */ export function NumberTicker({ value, format = "number", formatOptions, locale = "en-US", currency = "USD", prefix, suffix, duration = 800, highlightChanges = false, animateOnMount = false, className, ...props }: NumberTickerProps) { const reduced = usePrefersReducedMotion(); const optionsKey = JSON.stringify(formatOptions ?? null); const formatter = useMemo( () => getFormatter(locale, resolveOptions(format, currency, formatOptions)), // formatOptions is compared by content so inline objects stay cheap. // eslint-disable-next-line react-hooks/exhaustive-deps [locale, format, currency, optionsKey], ); const { text, slots } = useMemo( () => toSlots(value, formatter), [value, formatter], ); const [armed, setArmed] = useState(!animateOnMount); const shown = armed ? slots : zeroed(slots); const signature = (armed ? "" : "0|") + shown.map(slotKey).join("|"); const shownValue = armed ? value : 0; const [state, setState] = useState(() => ({ signature, value: shownValue, items: shown.map((slot) => ({ ...slot, phase: "idle" })), direction: 0, flash: null, version: 0, })); if (state.signature !== signature) { const direction = Math.sign(shownValue - state.value); // The first roll up from zero is an entrance, not a change worth tinting. const entrance = state.signature.startsWith("0|"); setState({ signature, value: shownValue, items: mergeSlots(state.items, shown, !reduced), direction, flash: highlightChanges && !entrance && direction !== 0 ? direction > 0 ? "up" : "down" : null, version: state.version + 1, }); } // Roll up from zero after the first paint (or settle at once without motion). useLayoutEffect(() => { if (armed) return; if (reduced) { setArmed(true); return; } let inner = 0; const outer = requestAnimationFrame(() => { inner = requestAnimationFrame(() => setArmed(true)); }); return () => { cancelAnimationFrame(outer); cancelAnimationFrame(inner); }; }, [armed, reduced]); // Drop collapsed slots and fade the tint once the roll has settled. const { version } = state; const hasExits = state.items.some((item) => item.phase === "exit"); useEffect(() => { if (!hasExits) return; const timer = window.setTimeout( () => setState((current) => current.version === version ? { ...current, items: current.items.filter((item) => item.phase !== "exit"), } : current, ), duration + MAX_STAGGER, ); return () => window.clearTimeout(timer); }, [version, hasExits, duration]); const flashing = state.flash !== null; useEffect(() => { if (!flashing) return; const timer = window.setTimeout( () => setState((current) => current.version === version ? { ...current, flash: null } : current, ), Math.max(360, duration * 0.75), ); return () => window.clearTimeout(timer); }, [version, flashing, duration]); const animate = !reduced; return ( 0 ? "up" : state.direction < 0 ? "down" : undefined } className={cn("inline-block whitespace-nowrap tabular-nums", className)} {...props} > {prefix} {text} {/* Digits always run left to right, even inside right-to-left text. */} {suffix} ); } function slotKey(slot: Slot) { return slot.kind === "digit" ? `${slot.key}=${slot.digit}` : slot.key; } function TickerSlot({ item, direction, formatter, duration, animate, }: { item: Item; direction: number; formatter: TickerFormatter; duration: number; animate: boolean; }) { // New slots mount collapsed, then open on the next frame so the change transitions. const [open, setOpen] = useState(item.phase !== "enter" || !animate); useEffect(() => { if (open) return; let inner = 0; const outer = requestAnimationFrame(() => { inner = requestAnimationFrame(() => setOpen(true)); }); return () => { cancelAnimationFrame(outer); cancelAnimationFrame(inner); }; }, [open]); const collapsed = !open || item.phase === "exit"; const travel = direction < 0 ? -1 : 1; const offset = item.phase === "exit" ? -travel : travel; const delay = item.kind === "digit" ? Math.min(item.order * STAGGER, MAX_STAGGER) : 0; const style: CSSProperties = { gridTemplateColumns: collapsed ? "0fr" : "1fr", opacity: collapsed ? 0 : 1, transform: collapsed ? `translateY(${offset * 0.42}em)` : undefined, transition: animate ? `grid-template-columns ${duration * 0.7}ms ${SIZE_EASE}, opacity ${duration * 0.5}ms ease, transform ${duration}ms ${SLIDE_EASE}` : "none", }; return ( {item.kind === "digit" ? ( ) : ( {item.char} )} ); } function DigitWheel({ digit, direction, formatter, duration, delay, animate, }: { digit: number; direction: number; formatter: TickerFormatter; duration: number; delay: number; animate: boolean; }) { const [wheel, setWheel] = useState({ digit, cell: REST + digit, travel: 0, rolling: false, }); if (wheel.digit !== digit) { // Roll forward when the value rises and backward when it falls, wrapping // through 9 → 0 the way a mechanical counter carries. const forward = (digit - wheel.digit + 10) % 10; const backward = (wheel.digit - digit + 10) % 10; const step = direction > 0 ? forward : direction < 0 ? -backward : forward <= backward ? forward : -backward; let cell = wheel.cell + step; if (cell < 0 || cell >= CELLS) cell = REST + digit; setWheel( animate ? { digit, cell, travel: cell - wheel.cell, rolling: true } : { digit, cell: REST + digit, travel: 0, rolling: false }, ); } // Once settled, jump back to the matching cell in the middle run (same glyph). useEffect(() => { if (!wheel.rolling) return; const timer = window.setTimeout( () => setWheel((current) => ({ digit: current.digit, cell: REST + current.digit, travel: 0, rolling: false, })), duration + delay + 40, ); return () => window.clearTimeout(timer); }, [wheel, duration, delay]); // Cells carry --ticker-gap of padding above and below, and the clipping window // reaches that far past the line box. At rest only padding shows in the // overhang; while rolling, neighbors fade through it like a real wheel. return ( {formatter.glyphs[digit]} {formatter.cells} ); } ``` ### `src/registry/overtrue/sparkline.tsx` ```tsx "use client"; import { useId, type CSSProperties } from "react"; import { cn } from "@/lib/utils"; export interface SparklineProps { data: number[]; label: string; className?: string; filled?: boolean; /** Mark the most recent value. */ endpoint?: boolean; /** Any CSS color. Defaults to the current text color, which is primary. */ color?: string; /** Draw the line in and raise the area when the sparkline mounts. Skipped under reduced motion. */ animate?: boolean; } const WIDTH = 240; const HEIGHT = 48; const PAD_X = 3; const PAD_Y = 5; const EASE = "ease-[cubic-bezier(0.22,1,0.36,1)]"; /** Monotone cubic path: smooth, but never overshoots the data. */ function monotonePath(points: [number, number][]) { const n = points.length; if (n < 2) return ""; const dx: number[] = []; const slope: number[] = []; for (let i = 0; i < n - 1; i++) { dx.push(points[i + 1][0] - points[i][0]); slope.push((points[i + 1][1] - points[i][1]) / dx[i]); } const tangent = [slope[0]]; for (let i = 1; i < n - 1; i++) { tangent.push( slope[i - 1] * slope[i] <= 0 ? 0 : (slope[i - 1] + slope[i]) / 2, ); } tangent.push(slope[n - 2]); for (let i = 0; i < n - 1; i++) { if (slope[i] === 0) { tangent[i] = tangent[i + 1] = 0; continue; } const a = tangent[i] / slope[i]; const b = tangent[i + 1] / slope[i]; const h = a * a + b * b; if (h > 9) { const t = 3 / Math.sqrt(h); tangent[i] = t * a * slope[i]; tangent[i + 1] = t * b * slope[i]; } } const r = (value: number) => Math.round(value * 100) / 100; let d = `M${r(points[0][0])},${r(points[0][1])}`; for (let i = 0; i < n - 1; i++) { const [x0, y0] = points[i]; const [x1, y1] = points[i + 1]; const h = dx[i] / 3; d += `C${r(x0 + h)},${r(y0 + tangent[i] * h)} ${r(x1 - h)},${r(y1 - tangent[i + 1] * h)} ${r(x1)},${r(y1)}`; } return d; } /** A compact overview. Use a full chart when individual values need inspection. */ export function Sparkline({ data, label, className, filled = true, endpoint = true, color, animate = true, }: SparklineProps) { const gradient = `sparkline-${useId().replace(/:/g, "")}`; const values = data.filter(Number.isFinite); let low = Infinity, high = -Infinity; for (const value of values) { low = Math.min(low, value); high = Math.max(high, value); } const points = values.map((value, i): [number, number] => [ values.length > 1 ? PAD_X + (i / (values.length - 1)) * (WIDTH - PAD_X * 2) : WIDTH / 2, high === low ? HEIGHT / 2 : HEIGHT - PAD_Y - ((value - low) / (high - low)) * (HEIGHT - PAD_Y * 2), ]); const line = monotonePath(points); const last = points[points.length - 1]; const lastValue = values[values.length - 1]; const motion = animate ? "motion-reduce:transition-none" : "transition-none"; return (
{values.length > 1 && filled && ( )} {/* Drawn in HTML so the marker stays round when the line stretches. */} {endpoint && last && (
); } ``` ### `src/registry/overtrue/delta-badge.tsx` ```tsx /** Adapted from dashboardcn (MIT), copyright 2026 dashboardcn contributors. * Source: https://github.com/NoahGdev/dashboardcn/tree/b1ffacbca0f7a0be60135c8665b9e8c267205c48 * * MIT License * * Copyright (c) 2026 dashboardcn contributors * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in all * copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. * * --- * * Portions of this project are derived from shadcn/ui and shadcn/registry-template * (https://github.com/shadcn-ui/ui), Copyright (c) 2023 shadcn, licensed under the * MIT License. The notice above applies to those portions as well. */ import * as React from "react"; import { IconArrowDownRight as ArrowDownRight, IconArrowUpRight as ArrowUpRight, IconMinus as Minus, } from "@tabler/icons-react"; import { cn } from "@/lib/utils"; import { formatDelta } from "./metric-format"; export type DeltaDirection = "up" | "down" | "flat"; export function getDeltaDirection(delta: number | undefined): DeltaDirection { if (delta === undefined || delta === 0 || !Number.isFinite(delta)) return "flat"; return delta > 0 ? "up" : "down"; } const directionIcon: Record = { up: ArrowUpRight, down: ArrowDownRight, flat: Minus, }; type Tone = "positive" | "negative" | "neutral"; const toneText: Record = { positive: "text-emerald-700 dark:text-emerald-400", negative: "text-rose-700 dark:text-rose-400", neutral: "text-muted-foreground", }; const toneSoft: Record = { positive: "bg-emerald-500/10 dark:bg-emerald-400/10", negative: "bg-rose-500/10 dark:bg-rose-400/10", neutral: "bg-muted dark:bg-muted/70", }; const toneOutline: Record = { positive: "bg-emerald-500/[0.06] ring-emerald-600/20 dark:bg-emerald-400/[0.07] dark:ring-emerald-400/25", negative: "bg-rose-500/[0.06] ring-rose-600/20 dark:bg-rose-400/[0.07] dark:ring-rose-400/25", neutral: "bg-muted/40 ring-border", }; export interface DeltaBadgeProps extends React.ComponentProps<"span"> { /** Fractional change, e.g. 0.124 for +12.4%. */ delta: number; /** Treat a decrease as good and an increase as bad (churn, latency, errors). */ invert?: boolean; variant?: "outline" | "soft" | "text"; showIcon?: boolean; } /** A change chip: the arrow shows direction, the color shows whether it helps. */ function DeltaBadge({ delta, invert = false, variant = "outline", showIcon = true, className, children, ...props }: DeltaBadgeProps) { const direction = getDeltaDirection(delta); const positive = direction === "flat" ? null : (direction === "up") !== invert; const tone: Tone = positive === true ? "positive" : positive === false ? "negative" : "neutral"; const Icon = directionIcon[direction]; const pill = variant !== "text"; return ( {showIcon ? ( ); } export { DeltaBadge }; ``` ### `src/registry/overtrue/metric-format.tsx` ```tsx /** Adapted from dashboardcn (MIT), copyright 2026 dashboardcn contributors. * Source: https://github.com/NoahGdev/dashboardcn/tree/b1ffacbca0f7a0be60135c8665b9e8c267205c48 * * MIT License * * Copyright (c) 2026 dashboardcn contributors * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in all * copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. * * --- * * Portions of this project are derived from shadcn/ui and shadcn/registry-template * (https://github.com/shadcn-ui/ui), Copyright (c) 2023 shadcn, licensed under the * MIT License. The notice above applies to those portions as well. */ export type NumberFormat = "number" | "compact" | "currency" | "percent"; export interface FormatNumberOptions { format?: NumberFormat; /** ISO 4217 code, used when format is "currency". Defaults to USD. */ currency?: string; locale?: string; maximumFractionDigits?: number; /** Abbreviate large values, e.g. "$158K" instead of "$158,143". */ compact?: boolean; } const formatterCache = new Map(); function getFormatter(locale: string, options: Intl.NumberFormatOptions) { const key = locale + JSON.stringify(options); let formatter = formatterCache.get(key); if (!formatter) { formatter = new Intl.NumberFormat(locale, options); formatterCache.set(key, formatter); } return formatter; } /** * Format a metric value for display. * * formatNumber(1234567) -> "1,234,567" * formatNumber(1234567, { format: "compact" }) -> "1.2M" * formatNumber(48.2, { format: "currency" }) -> "$48.20" * formatNumber(158143, { format: "currency", compact: true }) -> "$158K" * formatNumber(0.124, { format: "percent" }) -> "12.4%" */ export function formatNumber( value: number, { format = "number", currency = "USD", locale = "en-US", maximumFractionDigits, compact = false, }: FormatNumberOptions = {}, ): string { if (!Number.isFinite(value)) return "—"; // Compact values keep three significant digits: $158K, $1.23M, 41.2K. const compactOptions: Intl.NumberFormatOptions = compact ? maximumFractionDigits === undefined ? { notation: "compact", maximumSignificantDigits: 3 } : { notation: "compact", maximumFractionDigits } : {}; switch (format) { case "compact": return getFormatter(locale, { notation: "compact", maximumFractionDigits: maximumFractionDigits ?? 1, }).format(value); case "currency": return getFormatter(locale, { style: "currency", currency, maximumFractionDigits: maximumFractionDigits ?? 2, ...compactOptions, }).format(value); case "percent": return getFormatter(locale, { style: "percent", maximumFractionDigits: maximumFractionDigits ?? 1, }).format(value); default: return getFormatter(locale, { maximumFractionDigits: maximumFractionDigits ?? 0, ...compactOptions, }).format(value); } } /** * Format a fractional change as a signed percentage. * * formatDelta(0.124) -> "+12.4%" * formatDelta(-0.03) -> "-3.0%" * formatDelta(0) -> "0.0%" */ export function formatDelta(delta: number, locale = "en-US"): string { if (!Number.isFinite(delta)) return "—"; return getFormatter(locale, { style: "percent", signDisplay: "exceptZero", maximumFractionDigits: 1, minimumFractionDigits: 1, }).format(delta); } /** * Fractional change between two values. Returns 0 when there is no baseline. */ export function computeDelta(current: number, previous: number): number { if (!previous) return 0; return (current - previous) / Math.abs(previous); } ``` ### `src/registry/overtrue/stacked-area-chart.tsx` ```tsx "use client"; import * as React from "react"; import { cn } from "@/lib/utils"; /* ------------------------------------------------------------------------ */ /* Types */ /* ------------------------------------------------------------------------ */ /** How the series combine: stacked, normalised to 100%, centered as a streamgraph, or overlapping. */ export type StackedAreaStack = "normal" | "expand" | "stream" | "none"; export type StackedAreaCurve = "monotone" | "linear" | "step"; /** An x value as it appears in the data: a number, an ISO date string, a Date, or a category label. */ export type StackedAreaXValue = string | number | Date; export interface StackedAreaSeries { /** Field in each row that holds this series' value. */ key: string; /** Name in the legend and tooltip. Defaults to `key`. */ label?: string; /** Any CSS color. Defaults to the chart palette, cycling with softer tints past five. */ color?: string; } export interface StackedAreaReferenceLine { /** Value on the y axis. Drawn in normal and overlapping modes, where the axis is in value units. */ y: number; label?: string; color?: string; } export interface StackedAreaAnnotation { /** Where the marker sits, in the same form as the index values. */ x: StackedAreaXValue; label: string; color?: string; } /** One series at one point, as listed in the tooltip. */ export interface StackedAreaItem { key: string; label: string; color: string; value: number; /** Share of the visible total at this point (or over the range, in a summary), 0–1. */ share: number; } /** The point under the crosshair, passed to `renderTooltip` and `onHover`. */ export interface StackedAreaPoint { /** Position in the sorted data. */ index: number; /** A Date on time axes, otherwise the number or label from the data. */ x: StackedAreaXValue; /** The x value formatted for the tooltip. */ label: string; /** The original row. */ row: Record; /** Sum of the visible series. */ total: number; /** Visible series, top of the stack first. */ items: StackedAreaItem[]; /** Annotations that fall on this point. */ annotations: StackedAreaAnnotation[]; } /** Totals across the whole range, passed to a `header` function. */ export interface StackedAreaSummary { /** Sum of every visible series over every point. */ total: number; /** Visible total at the first and the last point. */ first: number; last: number; /** Every series with its total over the range and its share of `total`, in legend order. */ series: (StackedAreaItem & { hidden: boolean })[]; /** Number of points. */ count: number; /** The chart's value formatter. */ format: (value: number) => string; } export type StackedAreaXFormatter = ( value: StackedAreaXValue, context: "axis" | "tooltip", ) => string; export interface StackedAreaChartProps extends Omit< React.ComponentProps<"div">, "title" | "children" | "color" > { /** Rows, one per x value. Missing or negative values count as zero. */ data: Record[]; /** Field holding the x value: numbers, ISO date strings, Dates, or category labels. */ index: string; /** Series to stack, bottom first. */ series: StackedAreaSeries[]; stack?: StackedAreaStack; curve?: StackedAreaCurve; /** Plot height in pixels. Defaults to 280. */ height?: number; title?: React.ReactNode; description?: React.ReactNode; /** Controls placed at the top right. */ actions?: React.ReactNode; /** Content under the title, such as a headline total. A function receives the totals for the visible series. */ header?: React.ReactNode | ((summary: StackedAreaSummary) => React.ReactNode); /** Formats values in the tooltip, legend, and summary. Defaults to compact numbers from 10,000. */ valueFormatter?: (value: number) => string; /** Formats y axis ticks. Defaults to compact numbers such as 2.4M, or percentages when expanded. */ axisFormatter?: (value: number) => string; /** Formats x values on the axis and in the tooltip. Dates default to Intl formats matched to the spacing. */ xFormatter?: StackedAreaXFormatter; /** Short name of the y axis, shown above it. */ yLabel?: string; referenceLines?: StackedAreaReferenceLine[]; /** Thin vertical markers with a label, for events such as a deploy. */ annotations?: StackedAreaAnnotation[]; /** Keys of hidden series. Pass with `onHiddenSeriesChange` to control the legend. */ hiddenSeries?: string[]; defaultHiddenSeries?: string[]; onHiddenSeriesChange?: (hidden: string[]) => void; /** Show the interactive legend. Defaults to true. */ showLegend?: boolean; legendPosition?: "top" | "bottom"; /** Replaces the tooltip content. */ renderTooltip?: (point: StackedAreaPoint) => React.ReactNode; /** Called when the crosshair moves to a point, and with null when it leaves. */ onHover?: (point: StackedAreaPoint | null) => void; /** Tween between states when series toggle, the stack mode changes, or data updates. Defaults to true. */ animate?: boolean; } /* ------------------------------------------------------------------------ */ /* Formatting */ /* ------------------------------------------------------------------------ */ const DAY = 86_400_000; const tidy = (value: number) => +value.toPrecision(12); const lowerK = (text: string) => text.replace(/K$/, "k"); const compactAxis = new Intl.NumberFormat("en-US", { notation: "compact", maximumFractionDigits: 1, }); const compactValue = new Intl.NumberFormat("en-US", { notation: "compact", maximumSignificantDigits: 3, }); const grouped = new Intl.NumberFormat("en-US", { maximumFractionDigits: 2 }); function defaultValueFormatter(value: number) { if (!Number.isFinite(value)) return "—"; return Math.abs(value) >= 10_000 ? lowerK(compactValue.format(value)) : grouped.format(value); } function defaultAxisFormatter(value: number) { return value === 0 ? "0" : lowerK(compactAxis.format(value)); } function percentAxis(value: number) { return `${tidy(value * 100)}%`; } function formatShare(share: number, digits = 1) { const pct = share * 100; if (!Number.isFinite(pct) || pct === 0) return "0%"; if (pct < 0.1) return "<0.1%"; return `${pct.toFixed(digits)}%`; } // "Atlas Large hidden" reads better than a pressed state for screen readers. const sentence = (parts: string[]) => parts.filter(Boolean).join(" "); /* ------------------------------------------------------------------------ */ /* X values */ /* ------------------------------------------------------------------------ */ type XKind = "time" | "number" | "category"; const DATE_ONLY = /^(\d{4})-(\d{2})(?:-(\d{2}))?$/; const DATE_TIME = /^\d{4}-\d{2}-\d{2}[T ]\d{2}:\d{2}(?::\d{2}(?:\.\d+)?)?(?:Z|[+-]\d{2}:?\d{2})?$/; /** Date-only strings are local calendar days, so "2026-10-03" never renders as Oct 2. */ function toTime(raw: unknown): number | null { if (raw instanceof Date) { const t = raw.getTime(); return Number.isNaN(t) ? null : t; } if (typeof raw !== "string") return null; const day = DATE_ONLY.exec(raw); if (day) return new Date(+day[1], +day[2] - 1, day[3] ? +day[3] : 1).getTime(); if (DATE_TIME.test(raw)) { const t = Date.parse(raw.replace(" ", "T")); return Number.isNaN(t) ? null : t; } return null; } function xKindOf(values: unknown[]): XKind { if (!values.length) return "category"; if (values.every((v) => typeof v === "number" && Number.isFinite(v))) return "number"; if (values.every((v) => toTime(v) !== null)) return "time"; return "category"; } function makeDateFormatter(step: number, spansYears: boolean) { const f = (options: Intl.DateTimeFormatOptions) => new Intl.DateTimeFormat("en-US", options); if (step < DAY) { const time = f({ hour: "2-digit", minute: "2-digit", hourCycle: "h23" }); const day = f({ month: "short", day: "numeric" }); const tip = f({ weekday: "short", month: "short", day: "numeric", hour: "2-digit", minute: "2-digit", hourCycle: "h23", }); // Midnight ticks name the day, so a multi-day axis stays readable. return (d: Date, c: "axis" | "tooltip") => c === "tooltip" ? tip.format(d) : d.getHours() === 0 && d.getMinutes() === 0 ? day.format(d) : time.format(d); } if (step < 28 * DAY) { const axis = f({ month: "short", day: "numeric" }); const tip = f({ weekday: "short", month: "short", day: "numeric", ...(spansYears ? { year: "numeric" } : {}), }); return (d: Date, c: "axis" | "tooltip") => (c === "axis" ? axis : tip).format(d); } if (step < 360 * DAY) { const axis = f( spansYears ? { month: "short", year: "2-digit" } : { month: "short" }, ); const tip = f({ month: "long", year: "numeric" }); return (d: Date, c: "axis" | "tooltip") => (c === "axis" ? axis : tip).format(d); } const year = f({ year: "numeric" }); return (d: Date) => year.format(d); } /* ------------------------------------------------------------------------ */ /* Model */ /* ------------------------------------------------------------------------ */ interface Model { kind: XKind; rows: Record[]; /** Numeric x positions: epoch ms, numbers, or the row index for categories. */ xs: number[]; /** Parsed x values: Dates on time axes. */ xValues: StackedAreaXValue[]; /** Identity of each point, used to match points across updates. */ keys: string[]; /** Clean values per series and point. */ values: number[][]; /** Typical spacing between points, in x units. */ step: number; } function buildModel( data: Record[], index: string, keys: string[], ): Model { const kind = xKindOf(data.map((row) => row?.[index])); const items = data.map((row, i) => { const raw = row?.[index]; if (kind === "number") return { row, x: raw as number, value: raw as number }; if (kind === "time") { const t = toTime(raw)!; return { row, x: t, value: new Date(t) as StackedAreaXValue }; } return { row, x: i, value: String(raw ?? "") as StackedAreaXValue }; }); if (kind !== "category") items.sort((a, b) => a.x - b.x); const xs = items.map((item) => item.x); const diffs: number[] = []; for (let i = 1; i < xs.length; i++) if (xs[i] > xs[i - 1]) diffs.push(xs[i] - xs[i - 1]); diffs.sort((a, b) => a - b); return { kind, rows: items.map((item) => item.row ?? {}), xs, xValues: items.map((item) => item.value), keys: kind === "category" ? items.map((_, i) => String(i)) : xs.map(String), values: keys.map((key) => items.map((item) => { const v = Number(item.row?.[key]); return Number.isFinite(v) && v > 0 ? v : 0; }), ), step: diffs.length ? diffs[diffs.length >> 1] : 1, }; } /* ------------------------------------------------------------------------ */ /* Scales */ /* ------------------------------------------------------------------------ */ function niceStep(raw: number) { if (!(raw > 0)) return 1; const magnitude = 10 ** Math.floor(Math.log10(raw)); const r = raw / magnitude; return ( (r <= 1 ? 1 : r <= 2 ? 2 : r <= 2.5 ? 2.5 : r <= 5 ? 5 : 10) * magnitude ); } /** Ticks from zero: three to `most` intervals of 1, 2, 2.5 or 5 × 10ⁿ, with the least wasted headroom. */ function niceScale(max: number, most: number) { if (!(max > 0)) return { hi: 1, ticks: [0, 0.5, 1] }; const target = max * 1.02; const exponent = Math.floor(Math.log10(target)); let best: { step: number; count: number; score: number } | null = null; for (let e = exponent - 2; e <= exponent + 1; e++) for (const m of [1, 2, 2.5, 5]) { const step = m * 10 ** e; const count = Math.ceil(target / step - 1e-9); if (count < 3 || count > most) continue; const hi = count * step; const score = (hi - target) / hi + Math.abs(count - 4) * 0.04 + (m === 2.5 ? 0.04 : 0); if (!best || score < best.score) best = { step, count, score }; } const step = best?.step ?? niceStep(target / 4); const count = best?.count ?? Math.max(1, Math.ceil(target / step - 1e-9)); return { hi: tidy(count * step), ticks: Array.from({ length: count + 1 }, (_, i) => tidy(i * step)), }; } /* ------------------------------------------------------------------------ */ /* Frames: the stacked geometry in data units, tweened between states */ /* ------------------------------------------------------------------------ */ interface Frame { keys: string[]; xs: number[]; series: string[]; /** Lower and upper edge per series and point, in y units. */ y0: number[][]; y1: number[][]; /** 1 when a series is shown, 0 when hidden; fractional mid-tween. */ weight: number[]; x0: number; x1: number; lo: number; hi: number; } function stackFrame( model: Model, seriesKeys: string[], visible: boolean[], stack: StackedAreaStack, lo: number, hi: number, ): Frame { const n = model.xs.length; const y0 = seriesKeys.map(() => new Array(n).fill(0)); const y1 = seriesKeys.map(() => new Array(n).fill(0)); for (let j = 0; j < n; j++) { let total = 0; for (let s = 0; s < seriesKeys.length; s++) if (visible[s]) total += model.values[s][j]; if (stack === "none") { for (let s = 0; s < seriesKeys.length; s++) y1[s][j] = visible[s] ? model.values[s][j] : 0; continue; } const scale = stack === "expand" ? (total > 0 ? 1 / total : 0) : 1; let running = stack === "stream" ? -total / 2 : 0; for (let s = 0; s < seriesKeys.length; s++) { y0[s][j] = running; running += visible[s] ? model.values[s][j] * scale : 0; y1[s][j] = running; } } const first = model.xs[0] ?? 0; const last = model.xs[n - 1] ?? 1; const pad = n > 1 ? 0 : model.step / 2 || 0.5; return { keys: model.keys, xs: model.xs, series: seriesKeys, y0, y1, weight: visible.map((v) => (v ? 1 : 0)), x0: first - pad, x1: last + pad, lo, hi, }; } function framesEqual(a: Frame, b: Frame) { if (a === b) return true; const same = (p: number, q: number) => Math.abs(p - q) < 1e-9; if ( a.keys.length !== b.keys.length || a.series.length !== b.series.length || !same(a.x0, b.x0) || !same(a.x1, b.x1) || !same(a.lo, b.lo) || !same(a.hi, b.hi) ) return false; for (let i = 0; i < a.keys.length; i++) if (a.keys[i] !== b.keys[i] || !same(a.xs[i], b.xs[i])) return false; for (let s = 0; s < a.series.length; s++) { if (a.series[s] !== b.series[s] || a.weight[s] !== b.weight[s]) return false; for (let i = 0; i < a.keys.length; i++) if (!same(a.y0[s][i], b.y0[s][i]) || !same(a.y1[s][i], b.y1[s][i])) return false; } return true; } /** * Interpolates two frames. Points are matched by identity, so a sliding window keeps * every shared point still and glides the x domain instead of morphing the shape. */ function lerpFrame(a: Frame, b: Frame, t: number): Frame { const mix = (p: number, q: number) => p + (q - p) * t; const seriesIndex = new Map(a.series.map((key, i) => [key, i])); let keys = b.keys; let xs: number[]; let fromIndex: number[]; let toIndex: number[]; if ( a.keys.length === b.keys.length && a.keys.every((key, i) => key === b.keys[i]) ) { xs = b.xs.map((x, i) => mix(a.xs[i], x)); fromIndex = toIndex = b.keys.map((_, i) => i); } else { const inA = new Map(a.keys.map((key, i) => [key, i])); const inB = new Map(b.keys.map((key, i) => [key, i])); const xOf = (key: string) => inB.has(key) ? b.xs[inB.get(key)!] : a.xs[inA.get(key)!]; keys = [...new Set([...a.keys, ...b.keys])].sort((p, q) => xOf(p) - xOf(q)); xs = keys.map(xOf); fromIndex = keys.map((key) => inA.get(key) ?? -1); toIndex = keys.map((key) => inB.get(key) ?? -1); } const y0: number[][] = []; const y1: number[][] = []; const weight: number[] = []; b.series.forEach((key, s) => { const sa = seriesIndex.get(key) ?? -1; const lower: number[] = []; const upper: number[] = []; keys.forEach((_, j) => { const ia = fromIndex[j]; const ib = toIndex[j]; const to0 = ib >= 0 ? b.y0[s][ib] : null; const to1 = ib >= 0 ? b.y1[s][ib] : null; // A new series grows from its own base; a leaving point holds still. const from0 = sa >= 0 && ia >= 0 ? a.y0[sa][ia] : (to0 ?? 0); const from1 = sa >= 0 && ia >= 0 ? a.y1[sa][ia] : (to0 ?? 0); lower.push(mix(from0, to0 ?? from0)); upper.push(mix(from1, to1 ?? from1)); }); y0.push(lower); y1.push(upper); weight.push(mix(sa >= 0 ? a.weight[sa] : 0, b.weight[s])); }); return { keys, xs, series: b.series, y0, y1, weight, x0: mix(a.x0, b.x0), x1: mix(a.x1, b.x1), lo: mix(a.lo, b.lo), hi: mix(a.hi, b.hi), }; } /* ------------------------------------------------------------------------ */ /* Curves */ /* ------------------------------------------------------------------------ */ const r2 = (value: number) => Math.round(value * 100) / 100; /** Steffen's monotone tangents: no overshoot between points, so stacked edges never cross. */ function monotoneTangents(xs: number[], ys: number[]) { const n = xs.length; const m = new Array(n).fill(0); if (n < 2) return m; const h: number[] = []; const d: number[] = []; for (let i = 0; i < n - 1; i++) { h.push(xs[i + 1] - xs[i]); d.push(h[i] ? (ys[i + 1] - ys[i]) / h[i] : 0); } if (n === 2) { m[0] = m[1] = d[0]; return m; } for (let i = 1; i < n - 1; i++) { const s0 = d[i - 1]; const s1 = d[i]; if (s0 * s1 <= 0) continue; const p = (s0 * h[i] + s1 * h[i - 1]) / (h[i - 1] + h[i] || 1); m[i] = Math.sign(s0) * Math.min(2 * Math.abs(s0), 2 * Math.abs(s1), Math.abs(p)); } // One-sided ends keep the tangent within the first and last secant. m[0] = (3 * d[0] - m[1]) / 2; m[n - 1] = (3 * d[n - 2] - m[n - 2]) / 2; return m; } /** Path commands from the first point to the last (or back), without the opening move. */ function edge( xs: number[], ys: number[], curve: StackedAreaCurve, reverse: boolean, ) { const n = xs.length; if (n < 2) return ""; let out = ""; if (curve === "linear") { if (reverse) for (let i = n - 2; i >= 0; i--) out += `L${r2(xs[i])} ${r2(ys[i])}`; else for (let i = 1; i < n; i++) out += `L${r2(xs[i])} ${r2(ys[i])}`; return out; } if (curve === "step") { if (reverse) for (let i = n - 2; i >= 0; i--) { const mid = (xs[i] + xs[i + 1]) / 2; out += `H${r2(mid)}V${r2(ys[i])}H${r2(xs[i])}`; } else for (let i = 0; i < n - 1; i++) { const mid = (xs[i] + xs[i + 1]) / 2; out += `H${r2(mid)}V${r2(ys[i + 1])}H${r2(xs[i + 1])}`; } return out; } const m = monotoneTangents(xs, ys); const segment = (i: number) => { const h = (xs[i + 1] - xs[i]) / 3; return [ xs[i] + h, ys[i] + m[i] * h, xs[i + 1] - h, ys[i + 1] - m[i + 1] * h, ]; }; if (reverse) for (let i = n - 2; i >= 0; i--) { const [c1x, c1y, c2x, c2y] = segment(i); out += `C${r2(c2x)} ${r2(c2y)} ${r2(c1x)} ${r2(c1y)} ${r2(xs[i])} ${r2(ys[i])}`; } else for (let i = 0; i < n - 1; i++) { const [c1x, c1y, c2x, c2y] = segment(i); out += `C${r2(c1x)} ${r2(c1y)} ${r2(c2x)} ${r2(c2y)} ${r2(xs[i + 1])} ${r2(ys[i + 1])}`; } return out; } /* ------------------------------------------------------------------------ */ /* Hooks */ /* ------------------------------------------------------------------------ */ function useReducedMotion() { return React.useSyncExternalStore( (onChange) => { const query = window.matchMedia("(prefers-reduced-motion: reduce)"); query.addEventListener("change", onChange); return () => query.removeEventListener("change", onChange); }, () => window.matchMedia("(prefers-reduced-motion: reduce)").matches, () => false, ); } function useControllable( value: T | undefined, defaultValue: T, onChange?: (value: T) => void, ) { const [inner, setInner] = React.useState(defaultValue); const controlled = value !== undefined; const set = React.useCallback( (next: T) => { if (!controlled) setInner(next); onChange?.(next); }, [controlled, onChange], ); return [controlled ? value : inner, set] as const; } const easeOut = (t: number) => 1 - (1 - t) ** 3; const easeInOut = (t: number) => t < 0.5 ? 4 * t * t * t : 1 - (-2 * t + 2) ** 3 / 2; /** Default palette: the five chart colors, then softer tints of the same five. */ function paletteColor(i: number) { const base = `var(--color-chart-${(i % 5) + 1})`; const round = Math.floor(i / 5); return round === 0 ? base : `color-mix(in oklab, ${base} ${Math.max(40, 100 - round * 28)}%, var(--color-card))`; } const focusRing = "outline-none focus-visible:ring-2 focus-visible:ring-primary/30 focus-visible:shadow-[0_0_0_4px_color-mix(in_oklab,var(--color-primary)_10%,transparent)]"; const gridColor = "color-mix(in oklab, var(--color-foreground) 7%, transparent)"; const baseColor = "color-mix(in oklab, var(--color-foreground) 14%, transparent)"; /* ------------------------------------------------------------------------ */ /* StackedAreaChart */ /* ------------------------------------------------------------------------ */ /** * A composition over time: stacked, normalised, streamgraph, or overlapping areas with * an interactive legend, a snapping crosshair, annotations, and tweened re-stacking. */ export function StackedAreaChart({ data, index, series, stack = "normal", curve = "monotone", height = 280, title, description, actions, header, valueFormatter = defaultValueFormatter, axisFormatter, xFormatter, yLabel, referenceLines, annotations, hiddenSeries, defaultHiddenSeries = [], onHiddenSeriesChange, showLegend = true, legendPosition = "bottom", renderTooltip, onHover, animate = true, className, ...props }: StackedAreaChartProps) { const id = React.useId().replace(/:/g, ""); const reduced = useReducedMotion(); const motion = animate && !reduced; const [hidden, setHidden] = useControllable( hiddenSeries, defaultHiddenSeries, onHiddenSeriesChange, ); const hiddenSet = React.useMemo(() => new Set(hidden), [hidden]); // Geometry depends only on series keys, so inline series arrays never restart a tween. const seriesSignature = series.map((s) => s.key).join("\u0000"); const seriesKeys = React.useMemo( () => (seriesSignature ? seriesSignature.split("\u0000") : []), [seriesSignature], ); const meta = series.map((s, i) => ({ key: s.key, label: s.label ?? s.key, color: s.color ?? paletteColor(i), })); const model = React.useMemo( () => buildModel(data, index, seriesKeys), [data, index, seriesKeys], ); const n = model.xs.length; const visible = seriesKeys.map((key) => !hiddenSet.has(key)); const visibleSignature = visible.map(Number).join(""); const anyVisible = visible.some(Boolean); /* ------------------------------------------------------------- format */ const formatX = React.useMemo(() => { if (xFormatter) return xFormatter; if (model.kind === "time") { const first = model.xs[0] ?? 0; const last = model.xs[n - 1] ?? 0; const date = makeDateFormatter( model.step, new Date(first).getFullYear() !== new Date(last).getFullYear(), ); return (value: StackedAreaXValue, context: "axis" | "tooltip") => date(value instanceof Date ? value : new Date(value), context); } if (model.kind === "number") return (value: StackedAreaXValue) => typeof value === "number" ? grouped.format(value) : String(value); return (value: StackedAreaXValue) => String(value); }, [xFormatter, model, n]); const formatTick = React.useMemo( () => axisFormatter ?? (stack === "expand" ? percentAxis : defaultAxisFormatter), [axisFormatter, stack], ); /* -------------------------------------------------------------- scale */ const refs = React.useMemo( () => (referenceLines ?? []).filter( (line) => Number.isFinite(line.y) && (stack === "normal" || stack === "none"), ), [referenceLines, stack], ); const scale = React.useMemo(() => { const vis = visibleSignature.split("").map((v) => v === "1"); let peak = 0; for (let j = 0; j < n; j++) { let total = 0; for (let s = 0; s < seriesKeys.length; s++) { if (!vis[s]) continue; const v = model.values[s][j]; if (stack === "none") peak = Math.max(peak, v); else total += v; } peak = Math.max(peak, total); } if (stack === "expand") return { lo: 0, hi: 1, ticks: [0, 0.25, 0.5, 0.75, 1], peak }; if (stack === "stream") { const half = (peak || 1) / 2; return { lo: -half * 1.06, hi: half * 1.06, ticks: [0], peak }; } for (const line of refs) peak = Math.max(peak, line.y); const nice = niceScale(peak, height < 200 ? 4 : 5); return { lo: 0, hi: nice.hi, ticks: nice.ticks, peak }; }, [model, n, seriesKeys, visibleSignature, stack, refs, height]); const target = React.useMemo( () => stackFrame( model, seriesKeys, visibleSignature.split("").map((v) => v === "1"), stack, scale.lo, scale.hi, ), [model, seriesKeys, visibleSignature, stack, scale], ); /* ------------------------------------------------------------- motion */ const [tween, setTween] = React.useState(null); const shownRef = React.useRef(target); const modelRef = React.useRef(model); React.useLayoutEffect(() => { const from = shownRef.current; const dataChanged = modelRef.current !== model; modelRef.current = model; if (from === target) return; if (!motion || framesEqual(from, target)) { shownRef.current = target; setTween(null); return; } // Data updates glide a little longer than toggles, which should feel immediate. const duration = dataChanged ? 460 : 320; const ease = dataChanged ? easeInOut : easeOut; const start = performance.now(); setTween(from); let frame = requestAnimationFrame(function step(now) { const t = Math.min(1, (now - start) / duration); if (t >= 1) { shownRef.current = target; setTween(null); return; } const next = lerpFrame(from, target, ease(t)); shownRef.current = next; setTween(next); frame = requestAnimationFrame(step); }); return () => cancelAnimationFrame(frame); }, [target, model, motion]); const shown = tween ?? target; /* ------------------------------------------------------------- layout */ const plotRef = React.useRef(null); const [width, setWidth] = React.useState(0); React.useLayoutEffect(() => { const el = plotRef.current; if (!el) return; const measure = () => setWidth(Math.round(el.clientWidth)); measure(); const observer = new ResizeObserver(measure); observer.observe(el); return () => observer.disconnect(); }, []); const W = width || 640; const H = Math.max(96, height); // Annotation labels stack into lanes above the plot only when they would collide. const marks = React.useMemo(() => { if (!annotations?.length || !n) return []; const lanes: number[] = []; const span = target.x1 - target.x0 || 1; return annotations .map((note) => { let x: number | null = null; if (model.kind === "time") x = toTime(note.x); else if (model.kind === "number") x = typeof note.x === "number" ? note.x : Number(note.x); else { const i = model.xValues.findIndex((v) => v === String(note.x)); x = i >= 0 ? i : null; } if (x == null || !Number.isFinite(x)) return null; // The nearest point, so the tooltip can repeat the note. let nearest = 0; for (let i = 1; i < n; i++) if (Math.abs(model.xs[i] - x) < Math.abs(model.xs[nearest] - x)) nearest = i; return { note, x, nearest, fraction: (x - target.x0) / span }; }) .filter((m): m is NonNullable => m !== null) .filter((m) => m.fraction >= -0.001 && m.fraction <= 1.001) .sort((a, b) => a.x - b.x) .map((m) => { const w = Math.min(W, m.note.label.length * 6.3 + 24); const px = m.fraction * W; const flip = px + w > W && px - w >= 0; const left = flip ? px - w : Math.max(0, Math.min(px, W - w)); let lane = lanes.findIndex((right) => right + 6 <= left); if (lane < 0) lane = lanes.push(0) - 1; lanes[lane] = left + w; return { ...m, w, left, lane, flip }; }); }, [annotations, n, model, target.x0, target.x1, W]); const laneCount = marks.length ? Math.max(...marks.map((m) => m.lane)) + 1 : 0; const padTop = 8 + laneCount * 26; const padBottom = 1; const plotH = H - padTop - padBottom; const X = (x: number) => ((x - shown.x0) / (shown.x1 - shown.x0 || 1)) * W; const entranceBase = padTop + ((scale.hi - (stack === "stream" ? 0 : scale.lo)) / (scale.hi - scale.lo || 1)) * plotH; const Y = (y: number) => padTop + ((shown.hi - y) / (shown.hi - shown.lo || 1)) * plotH; const geometry = React.useMemo(() => { const px = shown.xs.map( (x) => ((x - shown.x0) / (shown.x1 - shown.x0 || 1)) * W, ); const py = (y: number) => padTop + ((shown.hi - y) / (shown.hi - shown.lo || 1)) * plotH; return shown.series.map((key, s) => { const top = shown.y1[s].map(py); const bottom = shown.y0[s].map(py); let thickness = 0; for (let j = 0; j < top.length; j++) thickness = Math.max(thickness, bottom[j] - top[j]); if (!px.length) return { key, area: "", line: "", base: "", thickness }; const single = px.length === 1; const xs = single ? [px[0] - W / 2, px[0] + W / 2] : px; const t = single ? [top[0], top[0]] : top; const b = single ? [bottom[0], bottom[0]] : bottom; const head = `M${r2(xs[0])} ${r2(t[0])}${edge(xs, t, curve, false)}`; return { key, line: head, base: `M${r2(xs[0])} ${r2(b[0])}${edge(xs, b, curve, false)}`, area: `${head}L${r2(xs[xs.length - 1])} ${r2(b[b.length - 1])}${edge(xs, b, curve, true)}Z`, thickness, }; }); }, [shown, W, padTop, plotH, curve]); /* -------------------------------------------------------------- ticks */ const yTicks = scale.ticks; const yTickLabels = stack === "stream" ? [] : yTicks.map(formatTick); const xTicks = React.useMemo(() => { if (!n) return [] as { x: number; label: string }[]; const labelWidth = 64; const room = Math.max(2, Math.floor(W / labelWidth)); if (model.kind === "number") { const lo = model.xs[0]; const hi = model.xs[n - 1]; if (hi <= lo) return [{ x: lo, label: formatX(lo, "axis") }]; const step = niceStep((hi - lo) / Math.max(1, room - 1)); const ticks: { x: number; label: string }[] = []; for ( let v = Math.ceil(lo / step - 1e-9) * step; v <= hi + step * 1e-6; v += step ) ticks.push({ x: tidy(v), label: formatX(tidy(v), "axis") }); return ticks; } // Every k-th point. Sub-day axes land on round hours; others count back from the // latest point so the newest value is always labelled. const subDay = model.kind === "time" && model.step < DAY; const steps = subDay ? [1, 2, 3, 4, 6, 8, 12, 24, 48, 72, 168] : model.kind === "time" && model.step >= 28 * DAY ? [1, 2, 3, 6, 12, 24, 60] : [1, 2, 3, 4, 5, 7, 10, 14, 15, 20, 28, 30, 50, 60, 100]; const k = steps.find((step) => Math.floor((n - 1) / step) + 1 <= room) ?? Math.ceil(n / room); let phase = (n - 1) % k; if (subDay) { const span = k * model.step; for (let o = 0; o < Math.min(k, n); o++) { const d = new Date(model.xs[o]); const sinceMidnight = model.xs[o] - new Date(d.getFullYear(), d.getMonth(), d.getDate()).getTime(); if (Math.round(sinceMidnight) % Math.round(span) === 0) { phase = o; break; } } } const ticks: { x: number; label: string }[] = []; for (let i = phase; i < n; i += k) ticks.push({ x: model.xs[i], label: formatX(model.xValues[i], "axis") }); return ticks; }, [n, model, W, formatX]); /* ---------------------------------------------------------- summaries */ const summary = React.useMemo(() => { const totals = seriesKeys.map((_, s) => model.values[s].reduce((sum, v) => sum + v, 0), ); const vis = visibleSignature.split("").map((v) => v === "1"); const total = totals.reduce((sum, v, s) => sum + (vis[s] ? v : 0), 0); const at = (j: number) => j < 0 ? 0 : seriesKeys.reduce( (sum, _, s) => sum + (vis[s] ? model.values[s][j] : 0), 0, ); return { total, first: n ? at(0) : 0, last: n ? at(n - 1) : 0, count: n, format: valueFormatter, series: seriesKeys.map((key, s) => ({ key, label: series[s]?.label ?? key, color: series[s]?.color ?? paletteColor(s), value: totals[s], share: vis[s] && total > 0 ? totals[s] / total : 0, hidden: !vis[s], })), }; }, [model, n, seriesKeys, visibleSignature, valueFormatter, series]); const pointAt = React.useCallback( (j: number): StackedAreaPoint => { const items: StackedAreaItem[] = []; let total = 0; for (let s = 0; s < seriesKeys.length; s++) if (visible[s]) total += model.values[s][j]; for (let s = seriesKeys.length - 1; s >= 0; s--) { if (!visible[s]) continue; const value = model.values[s][j]; items.push({ key: seriesKeys[s], label: series[s]?.label ?? seriesKeys[s], color: series[s]?.color ?? paletteColor(s), value, share: total > 0 ? value / total : 0, }); } return { index: j, x: model.xValues[j], label: formatX(model.xValues[j], "tooltip"), row: model.rows[j], total, items, annotations: marks.filter((m) => m.nearest === j).map((m) => m.note), }; }, // eslint-disable-next-line react-hooks/exhaustive-deps [model, seriesKeys, visibleSignature, series, formatX, marks], ); /* -------------------------------------------------------- interaction */ const [active, setActive] = React.useState(null); const [pointerBand, setPointerBand] = React.useState(null); const [hovered, setHighlight] = React.useState(null); // A series hidden while hovered no longer dims the rest. const highlight = hovered != null && !hiddenSet.has(hovered) ? hovered : null; const [announcement, setAnnouncement] = React.useState(""); const activeIndex = active != null && active < n ? active : null; const activePoint = React.useMemo( () => (activeIndex == null || !anyVisible ? null : pointAt(activeIndex)), [activeIndex, anyVisible, pointAt], ); const onHoverRef = React.useRef(onHover); React.useEffect(() => { onHoverRef.current = onHover; }); React.useEffect(() => { onHoverRef.current?.(activePoint); }, [activePoint]); const nearestIndex = (px: number) => { if (!n) return null; const x = target.x0 + (px / W) * (target.x1 - target.x0); let lo = 0; let hi = n - 1; while (lo < hi) { const mid = (lo + hi) >> 1; if (model.xs[mid] < x) lo = mid + 1; else hi = mid; } if (lo > 0 && Math.abs(model.xs[lo - 1] - x) <= Math.abs(model.xs[lo] - x)) lo -= 1; return lo; }; const handlePointer = (event: React.PointerEvent) => { if (!n || !anyVisible) return; const rect = event.currentTarget.getBoundingClientRect(); const px = event.clientX - rect.left; const py = event.clientY - rect.top; const j = nearestIndex(Math.min(W, Math.max(0, px))); setActive(j); if (j == null) return; // Which band sits under the pointer, so its tooltip row can stand out. let band: string | null = null; for (let s = seriesKeys.length - 1; s >= 0; s--) { if (!visible[s]) continue; const top = Y(target.y1[s][j]); const bottom = Y(target.y0[s][j]); if (py >= Math.min(top, bottom) - 2 && py <= Math.max(top, bottom) + 2) { band = seriesKeys[s]; break; } } setPointerBand(band); }; const describe = (point: StackedAreaPoint) => `${point.label}: total ${valueFormatter(point.total)}. ${point.items .map( (item) => `${item.label} ${valueFormatter(item.value)}, ${formatShare(item.share)}`, ) .join("; ")}.${point.annotations.length ? ` ${point.annotations.map((a) => a.label).join(". ")}.` : ""}`; const onKeyDown = (event: React.KeyboardEvent) => { if (!n || !anyVisible) return; let next: number | null = null; if (event.key === "ArrowRight") next = activeIndex == null ? 0 : Math.min(n - 1, activeIndex + 1); else if (event.key === "ArrowLeft") next = activeIndex == null ? n - 1 : Math.max(0, activeIndex - 1); else if (event.key === "Home") next = 0; else if (event.key === "End") next = n - 1; else if (event.key === "Escape" && activeIndex != null) { event.preventDefault(); setActive(null); return; } if (next == null) return; event.preventDefault(); setPointerBand(null); setActive(next); setAnnouncement(describe(pointAt(next))); }; const toggle = (key: string, solo: boolean) => { const label = series.find((s) => s.key === key)?.label ?? key; if (solo) { const only = seriesKeys.filter((k) => !hiddenSet.has(k)).length === 1 && !hiddenSet.has(key); setHidden(only ? [] : seriesKeys.filter((k) => k !== key)); setAnnouncement(only ? "Showing all series." : `Showing only ${label}.`); return; } const isHidden = hiddenSet.has(key); setHidden( isHidden ? hidden.filter((k) => k !== key) : [...hidden, key], ); setAnnouncement(sentence([label, isHidden ? "shown." : "hidden."])); }; /* -------------------------------------------------------------- render */ const headerContent = typeof header === "function" ? header(summary) : header; const hasHeader = title != null || description != null || actions != null || headerContent != null; const activeX = activeIndex != null ? X(model.xs[activeIndex]) : 0; const activeKeyIndex = activeIndex != null ? shown.keys.indexOf(model.keys[activeIndex]) : -1; // Keep the tooltip inside the plot, beside the crosshair on the roomier side. const tooltipRef = React.useRef(null); const [tooltipWidth, setTooltipWidth] = React.useState(200); React.useLayoutEffect(() => { const el = tooltipRef.current; if (el && el.offsetWidth && el.offsetWidth !== tooltipWidth) setTooltipWidth(el.offsetWidth); }); const tooltipLeft = activeX + 14 + tooltipWidth <= W || activeX < W / 2 ? Math.min(activeX + 14, Math.max(0, W - tooltipWidth)) : Math.max(0, activeX - 14 - tooltipWidth); const glide = motion ? "transition-transform duration-150 ease-out" : ""; const summaryText = (() => { if (!n) return "No data."; const parts = summary.series .filter((s) => !s.hidden) .map((s) => `${s.label} ${formatShare(s.share, 0)}`) .join(", "); const range = n > 1 ? `from ${formatX(model.xValues[0], "tooltip")} to ${formatX(model.xValues[n - 1], "tooltip")}` : formatX(model.xValues[0], "tooltip"); return `${stack === "expand" ? "Share" : "Stacked values"} of ${summary.series.filter((s) => !s.hidden).length} series ${range}. Total ${valueFormatter(summary.total)}: ${parts}.`; })(); const legend = showLegend && seriesKeys.length > 0 && (
{meta.map((s, i) => { const isHidden = hiddenSet.has(s.key); const share = summary.series[i]?.share ?? 0; return ( ); })} {legendPosition === "bottom" && seriesKeys.length > 1 && ( Alt-click to show one )}
); const crosshairDots = activeIndex != null && activeKeyIndex >= 0 ? shown.series .map((key, s) => { if (!visible[s] || shown.weight[s] < 0.5) return null; return { key, color: meta[s]?.color ?? paletteColor(s), y: Y(shown.y1[s][activeKeyIndex]), }; }) .filter((d): d is NonNullable => d !== null) : []; const lowestVisible = visible.indexOf(true); // Larger overlapping areas sit behind smaller ones; stacked bands draw top first. const drawOrder = React.useMemo(() => { const order = seriesKeys.map((_, s) => s); if (stack === "none") return order.sort( (a, b) => Math.max(0, ...model.values[b]) - Math.max(0, ...model.values[a]), ); return order.reverse(); }, [seriesKeys, stack, model]); return (
{hasHeader && (
{(title != null || description != null || actions != null) && (
{title != null && (

{title}

)} {description != null && (

{description}

)}
{actions != null && (
{actions}
)}
)} {headerContent != null && (
{headerContent}
)}
)} {legendPosition === "top" && legend}
{yLabel && stack !== "stream" && ( )}
{/* Value axis: an invisible copy of the labels sizes the gutter, so nothing is measured. */} {stack !== "stream" && ( )}
{ setActive(null); setPointerBand(null); }} onKeyDown={onKeyDown} onBlur={() => setActive(null)} className={cn( "relative cursor-crosshair touch-pan-y rounded-sm select-none", "outline-none focus-visible:ring-2 focus-visible:ring-primary/30 focus-visible:ring-offset-4 focus-visible:ring-offset-card", )} style={{ height: H }} > {/* Gridlines */} {/* Reference lines */} {refs.map((line, i) => { const color = line.color ?? "var(--color-muted-foreground)"; return (
{legendPosition === "bottom" && legend}
{meta.map((s) => ( ))} {model.rows.map((_, j) => ( {meta.map((s, si) => ( ))} ))}
{summaryText}
{index} {s.label} Total
{formatX(model.xValues[j], "tooltip")}{valueFormatter(model.values[si][j])} {valueFormatter( model.values.reduce((sum, values) => sum + values[j], 0), )}

{announcement}

); } function DefaultTooltip({ point, format, emphasis, }: { point: StackedAreaPoint; format: (value: number) => string; emphasis: string | null; }) { return (

{point.label}

{point.items.map((item) => ( ))} Total {format(point.total)} {point.annotations.map((note, i) => (

))}
); } ``` ### `src/registry/overtrue/latency-histogram.tsx` ```tsx "use client"; import * as React from "react"; import { IconX as X } from "@tabler/icons-react"; import { cn } from "@/lib/utils"; export type LatencyScale = "linear" | "log"; export type LatencyRange = [min: number, max: number]; export interface LatencyBucket { /** Inclusive lower edge. */ start: number; /** Exclusive upper edge. */ end: number; count: number; } /** One bar as drawn, passed to `renderTooltip`. */ export interface LatencyHistogramBucket extends LatencyBucket { index: number; /** Share of all requests in this bucket, 0–1. */ share: number; /** Share of requests at or below this bucket's upper edge, 0–1. */ cumulative: number; /** Raw comparison count in the same range, when `compare` is set. */ compare?: number; /** Comparison share of its own total, 0–1. */ compareShare?: number; /** The catch-all bar for values past the linear domain. */ overflow: boolean; /** Whether the bucket lies past `threshold`. */ overThreshold: boolean; } export interface LatencyHistogramColors { bar: string; compare: string; threshold: string; marker: string; selection: string; } export interface LatencyHistogramProps extends Omit< React.ComponentProps<"div">, "title" | "children" | "color" > { /** Raw samples. Bucketed for you, with exact percentiles. */ values?: number[]; /** Pre-bucketed counts, used when `values` is not given. Percentiles are interpolated. */ buckets?: LatencyBucket[]; /** A comparison distribution, e.g. yesterday. Scaled to the main total so shapes compare. */ compare?: number[] | LatencyBucket[]; /** Name of the comparison in the legend and tooltip. */ compareLabel?: string; /** Name of the main series in the legend. */ seriesLabel?: string; /** Draw the comparison as a stepped line or as outlined bars. */ compareStyle?: "step" | "outline"; /** Percentiles to mark, as numbers such as 50 or 99.9. */ percentiles?: number[]; /** Latency objective. The slow tail past it is shaded and measured. */ threshold?: number; thresholdLabel?: string; /** X scale. Pass with `onScaleChange` to control the built-in toggle. */ scale?: LatencyScale; defaultScale?: LatencyScale; onScaleChange?: (scale: LatencyScale) => void; /** Show the linear/log toggle. Defaults to true. */ showScaleToggle?: boolean; /** Brushed range. Pass `null` for none; leave undefined to let the component manage it. */ range?: LatencyRange | null; defaultRange?: LatencyRange | null; onRangeChange?: (range: LatencyRange | null) => void; title?: React.ReactNode; description?: React.ReactNode; /** Controls placed at the top right, before the scale toggle. */ actions?: React.ReactNode; /** Unit of the values. Defaults to "ms"; ms readouts switch to seconds from 1,000. */ unit?: string; /** Formats latencies in readouts, markers, and ticks. */ valueFormatter?: (value: number) => string; /** Target number of bars. Defaults to 40. */ bucketCount?: number; /** Fix the latency domain. Linear charts otherwise end near p99.5 and gather the rest in an overflow bar. */ domain?: LatencyRange; /** Plot height in pixels. Defaults to a third of the plot width, between 140 and 220. */ height?: number; /** Override any series color with a CSS color. */ colors?: Partial; /** Replaces the hover tooltip content. */ renderTooltip?: (bucket: LatencyHistogramBucket) => React.ReactNode; /** Show the percentile summary above the plot. Defaults to true. */ showSummary?: boolean; } /* ------------------------------------------------------------------------ */ /* Formatting */ /* ------------------------------------------------------------------------ */ const tidy = (value: number) => +value.toPrecision(12); const compact = new Intl.NumberFormat("en-US", { notation: "compact", maximumFractionDigits: 1, }); const whole = new Intl.NumberFormat("en-US"); function makeFormatter(unit: string) { const tight = unit.length <= 2; const join = (text: string, u: string) => u ? `${text}${tight ? "" : " "}${u}` : text; return (value: number) => { if (!Number.isFinite(value)) return "—"; const a = Math.abs(value); if (unit === "ms" && a >= 1000) return `${tidy(+(value / 1000).toFixed(a >= 10_000 ? 1 : 2))}s`; const digits = a >= 100 || a === 0 ? 0 : a >= 10 ? 1 : a >= 1 ? 2 : 3; return join(String(tidy(+value.toFixed(digits))), unit); }; } function makeTickFormatter(unit: string) { const tight = unit.length <= 2; return (value: number) => { if (value === 0) return "0"; if (unit === "ms" && Math.abs(value) >= 1000) return `${tidy(value / 1000)}s`; return `${tidy(value)}${tight ? "" : " "}${unit}`; }; } function percentLabel(share: number) { const pct = share * 100; if (pct === 0) return "0%"; if (pct < 0.1) return "<0.1%"; if (pct > 99.9 && pct < 100) return ">99.9%"; return `${pct >= 10 ? pct.toFixed(1) : pct.toFixed(2)}%`; } function niceStep(raw: number) { if (!(raw > 0)) return 1; const magnitude = 10 ** Math.floor(Math.log10(raw)); const r = raw / magnitude; return ( (r <= 1 ? 1 : r <= 2 ? 2 : r <= 2.5 ? 2.5 : r <= 5 ? 5 : 10) * magnitude ); } /** Round down or up to the nearest 1, 2, or 5 times a power of ten. */ function nice125(value: number, up: boolean) { const magnitude = 10 ** Math.floor(Math.log10(value)); const r = value / magnitude; const steps = [1, 2, 5, 10]; if (up) return (steps.find((s) => s >= r - 1e-9) ?? 10) * magnitude; return ([...steps].reverse().find((s) => s <= r + 1e-9) ?? 1) * magnitude; } function lowerBound(sorted: Float64Array, value: number) { let lo = 0; let hi = sorted.length; while (lo < hi) { const mid = (lo + hi) >> 1; if (sorted[mid] < value) lo = mid + 1; else hi = mid; } return lo; } function upperBound(sorted: Float64Array, value: number) { let lo = 0; let hi = sorted.length; while (lo < hi) { const mid = (lo + hi) >> 1; if (sorted[mid] <= value) lo = mid + 1; else hi = mid; } return lo; } /* ------------------------------------------------------------------------ */ /* Model */ /* ------------------------------------------------------------------------ */ interface Bar extends LatencyBucket { overflow: boolean; /** Left and right edges as 0–1 positions. */ x0: number; x1: number; } interface Distribution { sorted: Float64Array | null; buckets: LatencyBucket[] | null; total: number; min: number; max: number; mean: number; } function distributionOf( values?: number[], buckets?: LatencyBucket[], ): Distribution { if (values) { const clean = values.filter((value) => Number.isFinite(value)); const sorted = Float64Array.from(clean).sort(); let sum = 0; for (const value of sorted) sum += value; return { sorted, buckets: null, total: sorted.length, min: sorted.length ? sorted[0] : 0, max: sorted.length ? sorted[sorted.length - 1] : 0, mean: sorted.length ? sum / sorted.length : 0, }; } const list = (buckets ?? []) .filter( (b) => Number.isFinite(b.start) && Number.isFinite(b.end) && b.end > b.start, ) .sort((a, b) => a.start - b.start); let total = 0; let sum = 0; for (const b of list) { total += Math.max(0, b.count); sum += (Math.max(0, b.count) * (b.start + b.end)) / 2; } return { sorted: null, buckets: list, total, min: list.length ? list[0].start : 0, max: list.length ? list[list.length - 1].end : 0, mean: total ? sum / total : 0, }; } /** Nearest-rank percentile from samples; interpolated inside buckets otherwise. */ function quantile(d: Distribution, p: number) { if (!d.total) return 0; if (d.sorted) return d.sorted[ Math.min(d.total - 1, Math.max(0, Math.ceil(p * d.total) - 1)) ]; const target = p * d.total; let cumulative = 0; for (const b of d.buckets!) { if (cumulative + b.count >= target && b.count > 0) return b.start + ((target - cumulative) / b.count) * (b.end - b.start); cumulative += b.count; } return d.max; } /** Requests with a value in [a, b]. Partial buckets count in proportion. */ function countBetween(d: Distribution, a: number, b: number) { if (d.sorted) return upperBound(d.sorted, b) - lowerBound(d.sorted, a); let count = 0; for (const bucket of d.buckets!) { const overlap = Math.min(b, bucket.end) - Math.max(a, bucket.start); if (overlap > 0) count += (bucket.count * overlap) / (bucket.end - bucket.start); } return count; } function countAbove(d: Distribution, value: number) { if (d.sorted) return d.total - upperBound(d.sorted, value); return countBetween(d, value, Infinity); } interface Layout { bars: Bar[]; lo: number; hi: number; /** Largest value covered, including the overflow bar. */ top: number; pos: (value: number) => number; inv: (x: number) => number; } function layoutOf( d: Distribution, scale: LatencyScale, bucketCount: number, reach: number, domain?: LatencyRange, ): Layout { const count = Math.max(4, Math.round(bucketCount)); // Pre-bucketed data keeps its own edges. if (d.buckets) { const list = d.buckets; const first = list[0]?.start ?? 0; const last = list[list.length - 1]?.end ?? 1; if (scale === "log") { const positive = list.find((b) => b.start > 0)?.start ?? list[0]?.end ?? 1; const lo = first > 0 ? first : positive / 2; const span = Math.log(last / lo) || 1; const pos = (v: number) => Math.min(1, Math.max(0, Math.log(Math.max(v, lo) / lo) / span)); const inv = (x: number) => lo * Math.exp(x * span); return { bars: list.map((b) => ({ ...b, overflow: false, x0: pos(b.start), x1: pos(b.end), })), lo, hi: last, top: last, pos, inv, }; } const span = last - first || 1; const pos = (v: number) => Math.min(1, Math.max(0, (v - first) / span)); const inv = (x: number) => first + x * span; return { bars: list.map((b) => ({ ...b, overflow: false, x0: pos(b.start), x1: pos(b.end), })), lo: first, hi: last, top: last, pos, inv, }; } const sorted = d.sorted!; if (scale === "log") { const positive = sorted[lowerBound(sorted, Number.MIN_VALUE)] ?? 1; const lo = domain?.[0] && domain[0] > 0 ? domain[0] : nice125(Math.max(positive, 1e-9), false); const hi = Math.max( domain?.[1] ?? nice125(Math.max(d.max, lo * 10), true), lo * 1.0001, ); const span = Math.log(hi / lo); const step = span / count; const bars: Bar[] = Array.from({ length: count }, (_, i) => ({ start: lo * Math.exp(i * step), end: lo * Math.exp((i + 1) * step), count: 0, overflow: false, x0: i / count, x1: (i + 1) / count, })); for (const v of sorted) { const i = v <= lo ? 0 : Math.floor(Math.log(v / lo) / step); bars[Math.min(count - 1, Math.max(0, i))].count += 1; } const pos = (v: number) => Math.min(1, Math.max(0, Math.log(Math.max(v, lo) / lo) / span)); return { bars, lo, hi, top: hi, pos, inv: (x) => lo * Math.exp(x * span) }; } const lo = domain?.[0] ?? (d.min >= 0 ? 0 : -niceStep(-d.min)); const wanted = domain?.[1] ?? Math.max(reach, lo + 1e-9); const step = niceStep((wanted - lo) / count); const n = Math.max(1, Math.ceil((wanted - lo) / step - 1e-9)); const hi = lo + n * step; const overflowCount = d.total - upperBound(sorted, hi); const units = overflowCount > 0 ? n + 1.7 : n; const bars: Bar[] = Array.from({ length: n }, (_, i) => ({ start: tidy(lo + i * step), end: tidy(lo + (i + 1) * step), count: 0, overflow: false, x0: i / units, x1: (i + 1) / units, })); for ( let k = lowerBound(sorted, lo), end = upperBound(sorted, hi); k < end; k++ ) bars[Math.min(n - 1, Math.floor((sorted[k] - lo) / step))].count += 1; // Values below a fixed domain fold into the first bar. bars[0].count += lowerBound(sorted, lo); const top = Math.max(hi, d.max); if (overflowCount > 0) bars.push({ start: hi, end: top, count: overflowCount, overflow: true, x0: (n + 0.7) / units, x1: 1, }); const mainEnd = n / units; const overflowStart = (n + 0.7) / units; const pos = (v: number) => { if (v <= hi) return Math.max(0, ((v - lo) / (hi - lo)) * mainEnd); if (overflowCount <= 0 || top <= hi) return mainEnd; return Math.min( 1, overflowStart + ((v - hi) / (top - hi)) * (1 - overflowStart), ); }; const inv = (x: number) => { if (x <= mainEnd) return lo + (x / mainEnd) * (hi - lo); if (x < overflowStart || overflowCount <= 0) return hi; return hi + ((x - overflowStart) / (1 - overflowStart)) * (top - hi); }; return { bars, lo, hi, top, pos, inv }; } /** Bin a comparison into the main bars' edges. */ function binCompare(compare: number[] | LatencyBucket[], bars: Bar[]) { const counts = new Array(bars.length).fill(0); if (!bars.length) return { counts, total: 0 }; const find = (v: number) => { let lo = 0; let hi = bars.length - 1; while (lo < hi) { const mid = (lo + hi + 1) >> 1; if (bars[mid].start <= v) lo = mid; else hi = mid - 1; } return lo; }; let total = 0; for (const item of compare as (number | LatencyBucket)[]) { if (typeof item === "number") { if (!Number.isFinite(item)) continue; counts[find(item)] += 1; total += 1; } else if (Number.isFinite(item.count)) { counts[find((item.start + item.end) / 2)] += item.count; total += item.count; } } return { counts, total }; } /* ------------------------------------------------------------------------ */ /* Hooks */ /* ------------------------------------------------------------------------ */ function useReducedMotion() { return React.useSyncExternalStore( (onChange) => { const query = window.matchMedia("(prefers-reduced-motion: reduce)"); query.addEventListener("change", onChange); return () => query.removeEventListener("change", onChange); }, () => window.matchMedia("(prefers-reduced-motion: reduce)").matches, () => false, ); } function useControllable( value: T | undefined, defaultValue: T, onChange?: (value: T) => void, ) { const [inner, setInner] = React.useState(defaultValue); const controlled = value !== undefined; const set = React.useCallback( (next: T) => { if (!controlled) setInner(next); onChange?.(next); }, [controlled, onChange], ); return [controlled ? value : inner, set] as const; } const focusRing = "outline-none focus-visible:ring-2 focus-visible:ring-ring/50"; const percentileName = (p: number) => `p${tidy(p)}`; /* ------------------------------------------------------------------------ */ /* LatencyHistogram */ /* ------------------------------------------------------------------------ */ /** * A latency distribution: bucketed requests with percentile markers, an SLO tail, * an optional comparison, and brushing to measure any range. */ export function LatencyHistogram({ values, buckets, compare, compareLabel = "Previous", seriesLabel = "Current", compareStyle = "step", percentiles = [50, 90, 95, 99], threshold, thresholdLabel = "SLO", scale: scaleProp, defaultScale = "linear", onScaleChange, showScaleToggle = true, range: rangeProp, defaultRange = null, onRangeChange, title, description, actions, unit = "ms", valueFormatter, bucketCount = 40, domain, height, colors: colorsProp, renderTooltip, showSummary = true, className, ...props }: LatencyHistogramProps) { const id = React.useId(); const reduced = useReducedMotion(); const format = React.useMemo( () => valueFormatter ?? makeFormatter(unit), [valueFormatter, unit], ); const formatTick = React.useMemo( () => valueFormatter ?? makeTickFormatter(unit), [valueFormatter, unit], ); const colors: LatencyHistogramColors = { bar: "var(--color-chart-1)", compare: "var(--color-muted-foreground)", threshold: "var(--color-destructive)", marker: "var(--color-foreground)", selection: "var(--color-primary)", ...colorsProp, }; const [scale, setScale] = useControllable( scaleProp, defaultScale, onScaleChange, ); const [range, setRange] = useControllable( rangeProp, defaultRange, onRangeChange, ); const hasThreshold = threshold != null && Number.isFinite(threshold); const dist = React.useMemo( () => distributionOf(values, buckets), [values, buckets], ); const sortedPercentiles = React.useMemo( () => [...new Set(percentiles.filter((p) => p > 0 && p < 100))].sort( (a, b) => a - b, ), [percentiles], ); const empty = dist.total === 0; const marks = React.useMemo( () => dist.total === 0 ? [] : sortedPercentiles.map((p) => ({ p, value: quantile(dist, p / 100) })), [dist, sortedPercentiles], ); // Linear charts end just past the slow tail (and the SLO); the rest lands in an overflow bar. const reach = Math.max( quantile(dist, 0.995), (marks[marks.length - 1]?.value ?? 0) * 1.04, hasThreshold ? threshold! * 1.12 : 0, ); const layout = React.useMemo( () => layoutOf(dist, scale, bucketCount, reach, domain), [dist, scale, bucketCount, reach, domain], ); const { bars, pos, inv } = layout; const comparison = React.useMemo(() => { if (!compare?.length) return null; const { counts, total } = binCompare(compare, bars); const percentilesOf = (() => { if (typeof compare[0] === "number") { const d = distributionOf(compare as number[]); return sortedPercentiles.map((p) => quantile(d, p / 100)); } const d = distributionOf(undefined, compare as LatencyBucket[]); return sortedPercentiles.map((p) => quantile(d, p / 100)); })(); const factor = total ? dist.total / total : 0; return { counts, total, scaled: counts.map((c) => c * factor), percentiles: percentilesOf, }; }, [compare, bars, dist.total, sortedPercentiles]); const maxCount = Math.max( 1, ...bars.map((b) => b.count), ...(comparison?.scaled ?? [0]), ); // The tallest bar fills the plot; gridlines sit at round counts below it. const yMax = maxCount * 1.06; const yStep = niceStep(maxCount / 3.2); const yTicks = Array.from( { length: Math.floor(yMax / yStep + 1e-9) + 1 }, (_, i) => tidy(i * yStep), ); const over = hasThreshold ? countAbove(dist, threshold!) : 0; const overShare = dist.total ? over / dist.total : 0; const thresholdX = hasThreshold ? pos(threshold!) : 1; const cumulative = React.useMemo(() => { let running = 0; return bars.map((b) => (running += b.count) / (dist.total || 1)); }, [bars, dist.total]); const bucketAt = (index: number): LatencyHistogramBucket => { const b = bars[index]; return { index, start: b.start, end: b.end, count: b.count, share: dist.total ? b.count / dist.total : 0, cumulative: cumulative[index] ?? 0, compare: comparison ? comparison.counts[index] : undefined, compareShare: comparison?.total ? comparison.counts[index] / comparison.total : undefined, overflow: b.overflow, overThreshold: hasThreshold && b.start >= threshold!, }; }; /* -------------------------------------------------------------- layout */ const plotRef = React.useRef(null); const [width, setWidth] = React.useState(0); React.useLayoutEffect(() => { const el = plotRef.current; if (!el) return; const measure = () => setWidth(el.clientWidth); measure(); const observer = new ResizeObserver(measure); observer.observe(el); return () => observer.disconnect(); }, []); const W = width || 560; // Percentile chips stack into lanes only when they would collide. // With the summary on show, crowded chips drop their values, which the summary repeats. const chips = React.useMemo(() => { const place = (withValue: boolean) => { const lanes: number[] = []; return marks.map((mark) => { const text = withValue ? `${percentileName(mark.p)} ${format(mark.value)}` : percentileName(mark.p); const w = text.length * 6.1 + 14; const x = pos(mark.value) * W; const left = Math.min(Math.max(0, x - w / 2), Math.max(0, W - w)); let lane = lanes.findIndex((right) => right + 4 <= left); if (lane < 0) lane = lanes.push(0) - 1; lanes[lane] = left + w; return { ...mark, x, left, lane, w, withValue }; }); }; const full = place(true); if (!showSummary || full.every((chip) => chip.lane === 0)) return full; return place(false); }, [marks, pos, W, format, showSummary]); const laneCount = Math.max(1, ...chips.map((chip) => chip.lane + 1)); const chipTop = laneCount * 20 + 6; // Without a fixed height the plot follows the card width, shorter on narrow cards. const H = Math.max( 80, height ?? Math.round(Math.min(220, Math.max(140, W * 0.34))), ); const barsHeight = H - chipTop; const xTicks = React.useMemo(() => { const ticks: number[] = []; if (empty) return ticks; if (scale === "log" || dist.buckets) { if (scale === "log") { const lo = layout.lo; const hi = layout.hi; const candidates: number[] = []; for ( let e = Math.floor(Math.log10(lo)); e <= Math.ceil(Math.log10(hi)); e++ ) for (const m of [1, 2, 5]) { const v = tidy(m * 10 ** e); if (v >= lo * 0.999 && v <= hi * 1.001) candidates.push(v); } // Thin out 2s and then 5s until labels have room. for (const keep of [[1, 2, 5], [1, 5], [1]]) { const list = candidates.filter((v) => keep.includes( Math.round(v / 10 ** Math.floor(Math.log10(v) + 1e-9)), ), ); let ok = true; for (let i = 1; i < list.length; i++) if ((pos(list[i]) - pos(list[i - 1])) * W < 44) ok = false; if (ok || keep.length === 1) return list; } } } const lo = layout.lo; const hi = layout.hi; const step = niceStep((hi - lo) / Math.max(2, Math.floor(W / 76))); for ( let v = Math.ceil(lo / step - 1e-9) * step; v <= hi + step * 1e-6; v += step ) ticks.push(tidy(v)); return ticks; }, [scale, dist.buckets, layout, pos, W, empty]); /* ----------------------------------------------------------- animation */ // Bars grow in on mount and whenever the bucket layout changes; data updates tween. // Keyed on scale and bar count only, so live data with a drifting tail tweens instead of regrowing. const structure = `${scale}:${bars.length}`; const [grown, setGrown] = React.useState(null); const [intro, setIntro] = React.useState(true); React.useEffect(() => { if (reduced) { setGrown(structure); setIntro(false); return; } setIntro(true); let frame = requestAnimationFrame(() => { frame = requestAnimationFrame(() => setGrown(structure)); }); const timer = window.setTimeout( () => setIntro(false), 900 + bars.length * 9, ); return () => { cancelAnimationFrame(frame); window.clearTimeout(timer); }; }, [structure, reduced, bars.length]); const isGrown = grown === structure; /* --------------------------------------------------------- interaction */ const [hover, setHover] = React.useState(null); const [active, setActive] = React.useState(null); const [brush, setBrush] = React.useState(null); const drag = React.useRef<{ x: number; value: number; moved: boolean; } | null>(null); const anchor = React.useRef(null); const xToFraction = (clientX: number) => { const rect = plotRef.current!.getBoundingClientRect(); return Math.min(1, Math.max(0, (clientX - rect.left) / (rect.width || 1))); }; const barAt = (x: number) => { for (let i = 0; i < bars.length; i++) if (x >= bars[i].x0 && x <= bars[i].x1) return i; // In a gap: the nearest bar. let best = -1; let distance = Infinity; bars.forEach((b, i) => { const dd = Math.min(Math.abs(x - b.x0), Math.abs(x - b.x1)); if (dd < distance) { distance = dd; best = i; } }); return best < 0 ? null : best; }; const clampRange = (a: number, b: number): LatencyRange => [ Math.min(a, b), Math.max(a, b), ]; const onPointerDown = (event: React.PointerEvent) => { if (event.button !== 0 || !bars.length) return; const x = xToFraction(event.clientX); drag.current = { x: event.clientX, value: inv(x), moved: false }; event.currentTarget.setPointerCapture(event.pointerId); }; const onPointerMove = (event: React.PointerEvent) => { if (!bars.length) return; const x = xToFraction(event.clientX); const d = drag.current; if (d) { if (!d.moved && Math.abs(event.clientX - d.x) > 3) d.moved = true; if (d.moved) { setBrush(clampRange(d.value, inv(x))); setHover(null); return; } } setHover(barAt(x)); }; const onPointerUp = (event: React.PointerEvent) => { const d = drag.current; drag.current = null; if (!d) return; if (d.moved) { const next = clampRange(d.value, inv(xToFraction(event.clientX))); setBrush(null); setRange(next[1] - next[0] > 0 ? next : null); } else if (range) setRange(null); }; const onKeyDown = (event: React.KeyboardEvent) => { if (!bars.length) return; const current = active ?? -1; const step = (delta: number) => Math.min( bars.length - 1, Math.max( 0, current < 0 ? (delta > 0 ? 0 : bars.length - 1) : current + delta, ), ); let next: number | null = null; if (event.key === "ArrowRight") next = step(1); else if (event.key === "ArrowLeft") next = step(-1); else if (event.key === "Home") next = 0; else if (event.key === "End") next = bars.length - 1; else if (event.key === "Enter" && current >= 0) { setRange([bars[current].start, bars[current].end]); event.preventDefault(); return; } else if (event.key === "Escape") { if (range) setRange(null); else setActive(null); anchor.current = null; event.preventDefault(); return; } if (next == null) return; event.preventDefault(); if (event.shiftKey) { if (anchor.current == null) anchor.current = current < 0 ? next : current; const a = Math.min(anchor.current, next); const b = Math.max(anchor.current, next); setRange([bars[a].start, bars[b].end]); } else anchor.current = null; setActive(next); }; const shownRange = brush ?? range; const rangeCount = shownRange ? countBetween(dist, shownRange[0], shownRange[1]) : 0; const rangeShare = dist.total ? rangeCount / dist.total : 0; const focusIndex = hover ?? active; const focusBucket = focusIndex != null && bars[focusIndex] ? bucketAt(focusIndex) : null; /* -------------------------------------------------------------- render */ const describeBucket = (b: LatencyHistogramBucket) => `${b.overflow ? `${format(b.start)} and above` : `${format(b.start)} to ${format(b.end)}`}: ${whole.format(Math.round(b.count))} requests, ${percentLabel(b.share)}`; const summaryText = [ `${whole.format(Math.round(dist.total))} requests.`, marks .map((mark) => `${percentileName(mark.p)} ${format(mark.value)}`) .join(", ") + ".", hasThreshold ? `${percentLabel(overShare)} over the ${thresholdLabel} of ${format(threshold!)}.` : "", ] .filter(Boolean) .join(" "); const hasHeader = title != null || description != null || actions != null || showScaleToggle; const transition = intro ? "transform 760ms cubic-bezier(.16,1,.3,1)" : "transform 520ms cubic-bezier(.16,1,.3,1)"; const barFill = (color: string) => `color-mix(in oklab, ${color} 72%, var(--color-card))`; // The comparison as one stepped path across the bars. const comparePath = React.useMemo(() => { if (!comparison || compareStyle !== "step") return null; let path = ""; let previousEnd = -1; bars.forEach((b, i) => { const y = 100 - (comparison.scaled[i] / yMax) * 100; const x0 = b.x0 * 1000; const x1 = b.x1 * 1000; if (Math.abs(x0 - previousEnd) > 0.5) path += `${path ? "V100" : ""}M${x0.toFixed(2)} 100`; path += `V${y.toFixed(2)}H${x1.toFixed(2)}`; previousEnd = x1; }); return path + "V100"; }, [comparison, compareStyle, bars, yMax]); return (
{hasHeader && (
{title != null && (

{title}

)} {description != null && (

{description}

)}
{actions} {showScaleToggle && (
{(["linear", "log"] as const).map((option) => ( ))}
)}
)} {showSummary && (marks.length > 0 || hasThreshold) && ( // Narrow cards trade the stat grid for one line, so the distribution stays in view.
{marks.map((mark, i) => { const previous = comparison?.percentiles[i]; const delta = previous != null ? mark.value - previous : null; const hot = hasThreshold && mark.value > threshold!; return (
{percentileName(mark.p)}
{format(mark.value)}
{delta != null && Math.abs(delta) > 0 && (
0 ? "text-destructive" : "text-emerald-700 dark:text-emerald-400", )} > {delta > 0 ? "▲" : "▼"} {format(Math.abs(delta))}
)}
); })} {hasThreshold && (
0 ? "text-destructive" : "text-emerald-700 dark:text-emerald-400", )} > {percentLabel(overShare)}
over {thresholdLabel}
)}
)} {showSummary && (marks.length > 0 || hasThreshold) && ( )}
{ drag.current = null; setBrush(null); }} onPointerLeave={() => { if (!drag.current) setHover(null); }} onKeyDown={onKeyDown} onBlur={() => setActive(null)} className={cn( "relative cursor-crosshair touch-pan-y rounded-sm select-none", "outline-none focus-visible:ring-2 focus-visible:ring-ring/50 focus-visible:ring-offset-4 focus-visible:ring-offset-card", )} style={{ height: H }} > {empty && (

No requests to show.

)} {/* Value grid */} {/* SLO tail */} {hasThreshold && thresholdX < 1 && ( {/* Latency axis */}
{shownRange ? ( <> {format(shownRange[0])} – {format(shownRange[1])} {percentLabel(rangeShare)} {whole.format(Math.round(rangeCount))} of{" "} {whole.format(Math.round(dist.total))} requests {!brush && ( )} ) : ( {whole.format(Math.round(dist.total))} {" "} requests mean{" "} {format(dist.mean)} max{" "} {format(dist.max)} {" "} · drag to measure a range )}
{comparison && (
)}
{comparison && } {bars.map((b, i) => b.count > 0 || comparison?.counts[i] ? ( {comparison && ( )} ) : null, )}
{summaryText}
Latency Requests{compareLabel}
{b.overflow ? `${format(b.start)} and above` : `${format(b.start)} to ${format(b.end)}`} {whole.format(Math.round(b.count))}{whole.format(Math.round(comparison.counts[i]))}

{active != null && bars[active] ? describeBucket(bucketAt(active)) : range ? `Selected ${format(range[0])} to ${format(range[1])}: ${percentLabel(dist.total ? countBetween(dist, range[0], range[1]) / dist.total : 0)} of requests.` : ""}

); } ``` ### `src/registry/overtrue/insight-card.tsx` Left out to keep this page a readable size (34,743 characters). It is in the registry item above.