# Brush Chart (Notchset): prompt.md (v1.0.0)

- id: `brush-chart` · version 1.0.0 · component · pro (Pro)
- category: Charts
- build: Base UI (one set of files; its dependencies follow the build)
- install (this build): `npx shadcn@latest add @beautiful-ui-pro/brush-chart`
- npm dependencies: none
- registry dependencies: utils, @beautiful-ui/segmented-control, https://beautiful-ui.dev/r/notchset-foundation.json
- docs: https://beautiful-ui.dev/components/brush-chart
- The install command carries everything this item needs (files, CSS, tokens, npm and registry dependencies). Prefer it to copying source by hand.

A long series with a window: a crisp ink line with labelled axes, a transparent overview you brush or click, presets that tween, and milestones you add by clicking a day and naming it.

## Build it
- Stack: React 19 (`ref` is a plain prop), TypeScript, Tailwind CSS v4 utilities, a shadcn-initialised project with the `@/*` alias.
- Packages: none beyond React.
- Files: `components/ui/notchset/brush-chart.tsx`; shared code: `lib/beautiful-ui/notchset/instrument.tsx`, `lib/beautiful-ui/notchset/root.ts`, `lib/beautiful-ui/notchset/calendar.tsx`.
- Registry dependencies, installed with it automatically: shadcn `utils` (cn), `segmented-control`, `notchset-foundation`.
- Builds: one set of files for both, but its dependencies come in Base UI and Radix builds. Install the one that matches the project (see Install): a free item's bare URL installs the Base UI build of it and its dependencies.
- Exports to keep: `BrushChart`, and every exported type.
- CSS: the install adds the notchset foundation (tokens, keyframes, motion levels) to your global stylesheet once. Nothing to import by hand.
- Re-running `add` (or `--overwrite`) re-applies those rules: put overrides in your own CSS, never in the installed rules.
- Tokens: retheme with the `--notchset-*` custom properties (`--notchset-check`, `--notchset-control-edge`, `--notchset-draw-from`, `--notchset-ease-bloom`, `--notchset-ease-travel`, `--notchset-fade`, `--notchset-focus-color`, `--notchset-focus-inset`, `--notchset-life-from`, `--notchset-life-ms`, `--notchset-node-blink`, `--notchset-node-bloom`, `--notchset-node-delay`, `--notchset-plate-color`, `--notchset-rise-from`, `--notchset-rule`, `--notchset-scroll`, `--notchset-signal`, `--notchset-sweep-to`). Never add Tailwind colour classes inside the component.

```tsx
import { BrushChart, type BrushDatum, type Milestone } from "@/components/ui/notchset/brush-chart";
```

## Parts

| Part | data-slot | What it is for |
|---|---|---|
| `BrushChart` | `brush-chart` | The chart. |

Style a part with `[data-slot="<slot>"]` selectors or its `className`; keep the attributes when editing.

## Sound
- Keep every `data-slot` and `data-sound` attribute: the sound layer reads them.
- Installing this item adds no audio. Nothing plays until the app mounts `SoundProvider` once (install: `npx shadcn@latest add https://beautiful-ui.dev/r/notchset-sound.json`, import from `@/components/ui/notchset/sound-provider`); `useSound()` gives `muted` and `setMuted` for a mute control. Without a provider the audio engine never loads.

## Match the original
- Read `components/ui/notchset/brush-chart.tsx` as the reference implementation before changing or recreating anything, and match it: sizes, colours per theme, motion timings, copy and behaviour.
- If you deviate (a prop you can't honour, a style you changed, a dependency you swapped), say so in your reply, part by part.
- Keep the accessibility contract, the keyboard map and the motion levels listed below.

## Use it when
- brush chart, time series, zoom chart, range selector, overview detail, milestones, annotations, Notchset
- A year or more of daily data, explored a window at a time

### Not when
- A week of data: use Bar Chart

## Mistakes
- Milestones are yours: persist them from onMilestonesChange

## Usage

```tsx
"use client";

import * as React from "react";
import { BrushChart, type BrushDatum, type Milestone } from "@/components/ui/notchset/brush-chart";

const DAY = 864e5;
const daily: BrushDatum[] = Array.from({ length: 120 }, (_, i) => ({ date: new Date(Date.UTC(2026, 5, 1) + i * DAY), value: 20000 + Math.round(8000 * Math.sin(i / 11)) + i * 60 }));

export function RunsHistory() {
  const [ms, setMs] = React.useState<Milestone[]>([{ id: "mig", index: 74, label: "ATLAS 3 FLASH" }]);
  return <BrushChart data={daily} yMax={40000} title="RUNS PER DAY" milestones={ms} onMilestonesChange={setMs} />;
}
```

## Props

| Prop | Type | Default | What it does |
|---|---|---|---|
| `data` | `{ date, value }[]` |  | The series. |
| `yMax` | `number` |  | The scale. |
| `presets` | `number[]` |  | Window lengths (30, 90, 180, 365). |
| `defaultWindow` | `[start, end]` |  | Indices. |
| `milestones / onMilestonesChange` | `{ id, index, label }[]` |  | Your annotations. |

Full docs: https://beautiful-ui.dev/components/brush-chart

## Customising
- Colours: the component reads your shadcn tokens (`--background`, `--foreground`, `--border` …), refined by the `--notchset-*` tokens. The signal colour is `--notchset-signal` (it falls back to `--destructive`). Set tokens on `:root`, or on any container to retheme one area.
- Dark mode follows the `.dark` class on an ancestor (the shadcn and next-themes convention).
- Update later by re-running the install with `--overwrite` (review the diff if you edited it). Changelog: https://beautiful-ui.dev/r/changelog.json

## Keyboard

| Keys | Action |
|---|---|
| ← / → | Move the window a week |
| Enter / Esc | Save or cancel a milestone name |

## Performance

- Re-renders while dragging; points only at 100 days or fewer.

## Responsive

- Scales with its container (viewBox).

## Motion inventory

| Interaction | What moves |
|---|---|
| Presets | The window tweens (460ms, ease-in-out) |
| Drag | Window and handles follow the pointer; 14 days minimum |

## Accessibility contract (preserve when editing)
- The overview is a slider with value text; ← → move the window a week
- Milestones are listed as removable chips

## Install

```bash
npx shadcn@latest add @beautiful-ui-pro/brush-chart
```

Pro item: needs the `@beautiful-ui-pro` registry in `components.json` and `BEAUTIFUL_UI_TOKEN` in `.env.local` (https://beautiful-ui.dev/account). Setup: https://beautiful-ui.dev/docs/pro. Your components.json `style` picks the build: radix-*, new-york and default get Radix, base-* gets Base UI.

## Credits
- Built on shadcn/ui (https://ui.shadcn.com)

The notchset foundation (the tokens listed above, keyframes and motion levels) installs once with the first component; its CSS is public at https://beautiful-ui.dev/r/notchset-foundation.json.