# StationGlyph (/docs/charts/station-glyph)

StationGlyph packs a full point observation into one character, the way a meteorologist's station model does: the center
disc fills with sky cover, a wind barb gives direction and quantized speed, and up to three corner numerals carry
temperature, dew point, and pressure. Five fields, one glyph, no legend — dense enough to tile a map, legible enough to
read in a table cell.

```tsx
<StationGlyph
  station="KSFO"
  cloud={0.75}
  wind={{ direction: 225, magnitude: 15 }}
  temp={16}
  dewpoint={9}
  pressure={1013}
  size={48}
/>
```

## Install

```tsx
import { StationGlyph } from "@microcharts/react/station-glyph";

<StationGlyph
  station="KSFO"
  cloud={0.75}
  wind={{ direction: 225, magnitude: 15 }}
  temp={16}
  dewpoint={9}
  pressure={1013}
/>
```

Setup (package + stylesheet): [Quickstart](/docs/quickstart#set-up-with-an-ai-agent) or paste [`/agent-setup.md`](/agent-setup.md) into your agent.


## When to use it

- **Good for** — a dense weather station model, or any multi-field reading that must fit one cell.
- **Avoid for** — a single value (Delta) or a trend over time (Sparkline).


## Variants

```tsx
<StationGlyph station="KJFK" cloud={1} wind={{ direction: 300, magnitude: 45 }} temp={4} dewpoint={2} pressure={988} />
```

## Edge cases

```tsx
<StationGlyph station="STN" cloud={0.3} wind={{ direction: 0, magnitude: 0 }} />
```

```tsx
<StationGlyph cloud={0.4} />
```

```tsx
<StationGlyph />
```

```tsx
<StationGlyph
  station="EDDF"
  cloud={0.6}
  wind={{ direction: 90, magnitude: 22 }}
  temp={-3}
  dewpoint={-9}
  pressure={1024}
  format={{ maximumFractionDigits: 0 }}
  locale="de-DE"
/>
```

`format`/`locale` flow through every corner numeral (temp, dew point, pressure) and the wind speed and numerals named in
the accessible summary — one formatter, one locale, no per-field overrides.


## Why this default

Each field rides its own channel, so nothing is inferred from a shared one: sky cover is disc area, wind is the barb
(direction as angle, speed quantized into barbs so the per-barb quantum is honest), and the numerals are placed where a
forecaster expects them. Wind speed is quantized rather than drawn to scale for the same reason WindBarb quantizes it —
a barb count reads exactly, a tiny length does not. Absent fields simply don't render — no barb, no numeral, and no stop
for the keyboard. The one field with no "absent" state is the disc itself: omitting `cloud` looks and reads exactly like
a clear sky.

## Accessibility

The accessible name is the whole observation — **"KJFK, wind northwest 45; sky overcast, 4° / 2°, 988."** The
interactive entry roves the _present_ fields with ←/→ so a screen-reader user can step through station, wind, sky,
temperature, dew point, and pressure one at a time — an omitted prop is not a stop — and Escape clears the focus back to
the whole-observation reading.

The interactive entry follows the shared [interaction contract](/docs/accessibility#one-interaction-contract):
arrow keys rove between units on both axes, `Home` and `End` jump to the ends, and a click, tap, `Enter` or
`Space` selects a unit — pinning its readout so it survives blur, until you select it again or press `Escape`.
On touch, a tap pins and a drag scrubs.

## Props

| Prop | Type | Description |
| --- | --- | --- |
| `cloud` | `number` | Sky cover 0–1; fills the disc. |
| `wind` | `{ direction, magnitude }` | Barb direction + speed. |
| `step` | `number` | Wind-barb quantum — each full barb (default 10). |
| `temp` | `number` | Upper-left numeral. |
| `dewpoint` | `number` | Lower-left numeral. |
| `pressure` | `number` | Upper-right numeral. |
| `station` | `string` | Top-left identifier. |
| `animate` | `boolean` | (interactive) Opt-in entrance motion when the chart mounts client-side — add `import "@microcharts/react/motion"` once. Inert on the server, on hydrated server HTML, and under `prefers-reduced-motion`. |

Plus the shared grammar — `data`, `domain`, `color`, `title`, `summary`, `format` — and the layout props (`width`, `height`, `className`, `style`) that every chart accepts. Interactive entries also share `animate` and `live`, and — wherever a chart has more than one navigable unit — `onActive`, `onSelect`, `selectedIndex` and `defaultSelectedIndex`; and — wherever the chart shows a hover value — `readout`. See [the shared grammar](/docs/quickstart#the-shared-grammar).