# Radar Chart (Lumen Halo): prompt.md (v1.0.0)

- id: `lumen-radar-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/lumen-radar-chart`
- npm dependencies: recharts@^3
- registry dependencies: utils, @beautiful-ui/lumen-chart, @beautiful-ui/lumen-stat, https://beautiful-ui.dev/r/lumen-foundation.json
- docs: https://beautiful-ui.dev/components/lumen-radar-chart
- The install command carries everything this item needs (files, CSS, tokens, npm and registry dependencies). Prefer it to copying source by hand.

Two or three profiles over the same measures, as lit outlines over faint bodies. Arrow keys sweep the axes and the tooltip ranks the profiles on each one with the lead in words; legend entries hide a profile or bring it forward.

## Build it
- Stack: React 19 (`ref` is a plain prop), TypeScript, Tailwind CSS v4 utilities, a shadcn-initialised project with the `@/*` alias.
- Packages: `recharts@^3`.
- Files: `components/ui/lumen/charts/radar-chart.tsx`, `components/ui/lumen/charts/cartesian.tsx`.
- Registry dependencies, installed with it automatically: shadcn `utils` (cn), `lumen-chart`, `lumen-stat`, `lumen-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: `RadarChart`, and every exported type.
- CSS: the install merges this item's rules (the registry `css` field) into your global stylesheet, in `@layer components`, and adds the lumen foundation (tokens, keyframes, motion levels) 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 `--lumen-*` custom properties (`--lumen-accent`, `--lumen-accent-foreground`, `--lumen-accent-text`, `--lumen-bad`, `--lumen-bad-text`, `--lumen-chart-accent`, `--lumen-chart-accent-foreground`, `--lumen-chart-accent-text`, `--lumen-focus`, `--lumen-good`, `--lumen-good-text`, `--lumen-hairline`, `--lumen-ink`, `--lumen-muted-ink`, `--lumen-series-1`, `--lumen-series-2`, `--lumen-series-3`, `--lumen-series-4`, `--lumen-series-5`, `--lumen-series-6`, `--lumen-warn`, `--lumen-warn-text`); this item's CSS also reads `--lumen-font-mono`, `--lumen-font-sans`, `--lumen-radius-k`. Never add Tailwind colour classes inside the component.

```tsx
import { RadarChart } from "@/components/ui/lumen/charts/radar-chart";
```

## Parts

| Part | data-slot | What it is for |
|---|---|---|
| `RadarChart` | — | The plot, legend, tooltip, states, summary and table. |

## 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 `GlassSoundProvider` once (install: `npx shadcn@latest add https://beautiful-ui.dev/r/glass-sound.json`, import from `@/components/beautiful-ui/glass-sound`); `GlassSoundToggle` is its mute control. Without a provider the audio engine never loads.

## Match the original
- Read `components/ui/lumen/charts/radar-chart.tsx`, `components/ui/lumen/charts/cartesian.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
- radar chart, spider chart, web chart, profile comparison, scorecard, skills, compare plans across measures, Recharts
- Comparing two or three profiles across five to eight measures on one scale

### Not when
- Exact values or many profiles: use a grouped Bar Chart
- Measures on different scales: normalise them first, or use a table
- Change over time: use Line

## Mistakes
- Keep data and config stable (outside the component, or memoised)
- Put every measure on one scale (0–100, or shares) before drawing; a radar can't mix units
- More than three profiles tangle: use a grouped bar chart

## Usage

```tsx
"use client";
import { RadarChart } from "@/components/ui/lumen/charts/radar-chart";

const scores = [
  { measure: "Speed", now: 86, last: 71 },
  { measure: "Reliability", now: 92, last: 88 },
  { measure: "Price", now: 64, last: 66 },
  { measure: "Support", now: 79, last: 58 },
  { measure: "Docs", now: 74, last: 52 },
];

const config = {
  now: { label: "This release", color: "var(--chart-1)" },
  last: { label: "Last release", color: "var(--chart-3)" },
};

export function ReleaseScores() {
  return <RadarChart data={scores} axis="measure" config={config} max={100} label="Scores by measure" />;
}
```

## Props

| Prop | Type | Default | What it does |
|---|---|---|---|
| `data / axis` | `Row[] / keyof Row` |  | One row per axis, and the field that names it. |
| `config` | `ChartConfig` |  | One entry per profile with its label and color (var(--chart-N)) or theme { light, dark }. |
| `series` | `string[]` |  | Which config keys to draw, in order. Default: all. Two or three read best. |
| `max` | `number` |  | The outer ring's value. Default: the largest value rounded up; set 100 for scores. |
| `valueFormat` | `StatFormat \| (n) => string` |  | Numbers on the rings, tooltip, table and summary. |
| `grid / ticks` | `"polygon" \| "circle" / boolean` | `"polygon" / true` | Ring shape, and ring values along the first axis. |
| `legend` | `"toggle" \| "static" \| "none"` | `"toggle" with 2+ profiles` | Toggle buttons hide a profile; pointing at or focusing one brings it forward. |
| `tooltip` | `boolean` | `true` | The profiles on the active axis, highest first, with the lead. |
| `labels` | `{ lead?, tie? }` |  | Words for the lead line, for i18n: lead(leader, gap, runnerUp). |
| `height` | `number` | `320` | Plot height in px; the width follows the container. |
| `motion` | `"full" \| "subtle" \| "off"` | `"full"` | Reduced motion always wins. |
| `loading / error / emptyText / label / axisLabel` | `boolean / string / string / string / string` |  | States in words with the height held; the chart's accessible name; the axis column's name in the table. |

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

## Customising
- Motion: `motion="full"` (default) | `"subtle"` | `"off"`. prefers-reduced-motion is always respected.
- Colours: set the `--lumen-*` tokens on `:root`, or on a container with the `lumen-scope` class to retheme one area. Add the `lumen-inherit` class to follow your shadcn palette instead (`--chart-N`, `--destructive`).
- 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 |
|---|---|
| Tab | Focus the plot, then the legend |
| ← / → | Sweep to the previous or next axis; the tooltip compares the profiles there |
| Enter / Space | Toggle a focused legend entry |

## Performance

- SVG through Recharts: one polygon per profile; fine up to a dozen axes

## Responsive

- Fills its container's width; the radius follows the smaller side, and axis names sit outside the rings

## Motion inventory

| Interaction | What moves |
|---|---|
| Draw | Profiles grow out from the centre (900ms full, 450ms subtle, none off) |
| Legend focus | The pointed profile's body fills in and the others fade back |

## Accessibility contract (preserve when editing)
- A labelled figure; Recharts' accessibility layer makes the plot one tab stop and arrow keys sweep the axes with the tooltip following
- The tooltip ranks the profiles and says the lead in words, so colour is never the only cue
- A one-sentence summary and the full table (axis by profile) for screen readers
- Legend toggles are buttons with a pressed state; the last visible profile can't be hidden
- Negative values are refused in words (a radar measures out from the centre)

## Install

```bash
npx shadcn@latest add @beautiful-ui-pro/lumen-radar-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
- Recharts (https://recharts.org)
- shadcn/ui charts (https://ui.shadcn.com/charts)

The lumen 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/lumen-foundation.json.