# Comet Dial · Pro

A tick-ring dial you drag around by angle: ticks light up to the value and a comet tail streaks behind the glowing head when you move fast. Arrow keys work too.

This is a Charcoal UI Pro component. Its source and examples are available with a Pro seat: https://charcoalui.com/pricing

## With a Pro seat

1. Add the registry to components.json:

```json
{
  "registries": {
    "@charcoal": {
      "url": "https://charcoalui.com/r/{name}.json",
      "headers": {
        "Authorization": "Bearer ${CHARCOAL_LICENSE_KEY}"
      }
    }
  }
}
```

2. Copy your licence key from https://charcoalui.com/dashboard and put it in .env.local as CHARCOAL_LICENSE_KEY, then:

```bash
npx shadcn@latest add @charcoal/comet-dial
```

To read Pro source through this MCP server, reconnect it with the header "Authorization: Bearer <licence key>".

## API — Comet Dial
| Prop | Type | Default | Notes |
| --- | --- | --- | --- |
| `value / defaultValue` | `number` | `40` |  |
| `onValueChange` | `(v: number) => void` | — |  |
| `min / max` | `number` | `0 / 100` |  |
| `ticks` | `number` | `48` |  |
| `size` | `number` | `220` |  |
| `label / unit` | `string` | — |  |

See it live: https://charcoalui.com/docs/components/comet-dial