# ArrowStyle

Import it from `@grafloria/engine`.

```ts
interface ArrowStyle
```

**Properties**

| Name | Type | Default | Description |
| --- | --- | --- | --- |
| `type` | `'none' \| 'arrow' \| 'circle' \| 'square' \| 'diamond' // Phase 4: ERD-specific arrows \| 'crow-foot' // ERD many relationship (⋈) \| 'one' // ERD one relationship (\|) \| 'zero-or-one' // ERD optional relationship (O\|) \| 'zero-or-many' // ERD optional many (O⋈) \| 'one-or-many' // ERD mandatory many (\|⋈) // Phase 4: UML-specific arrows \| 'hollow-diamond' // UML aggregation (◇) \| 'filled-diamond' // UML composition (◆) \| 'generalization' // UML inheritance (△) \| 'open-arrow' // UML dependency/realization (⊳) \| 'double-arrow' // Bidirectional (⇄) // Phase 4: Additional arrows \| 'cross' // X mark \| 'bar' // Perpendicular line (⊥) \| 'dot' // Simple dot \| 'oval' // Oval shape // Wave 4 (Edges & links) — Card 5: half-arrowheads (Mermaid 11.13) \| 'half-arrow-left' // Only the left barb (relative to direction of travel) \| 'half-arrow-right' // Only the right barb // Wave 4 — Card 5: author-defined marker. Either `path` (raw SVG path data, // drawn in the marker's local frame with the tip toward +x) or `marker` // (the name of a marker registered with `registerMarker` in @grafloria/renderer). \| 'custom' // …and any other registered marker name. Keeps literal autocompletion for // the built-ins while letting `registerMarker('my-thing', …)` be used by // name, so the catalogue is no longer a closed enum. \| (string & {})` |  |  |
| `size` | `number` |  |  |
| `filled` | `boolean` |  |  |
| `width?` | `number` |  |  |
| `offset?` | `number` |  |  |
| `color?` | `string` |  |  |
| `path?` | `string` |  | Raw SVG path data for a `type: 'custom'` marker. Drawn in the marker's LOCAL frame: the origin is the anchor the renderer pulls back from the endpoint, +x is the direction of travel. Scale it yourself (or read `size` when you build the string). |
| `marker?` | `string` |  | Name of a marker registered via `registerMarker`. Set it with `type: 'custom'` (or simply put the registered name in `type`). |
| `tipOffset?` | `number` |  | Distance from the custom marker's local origin to its visual TIP, in the +x direction. The renderer pulls the marker back from the path endpoint by exactly this much so the tip lands on the port. Registered markers supply their own default; this overrides it. Default 0 for an unregistered `path` marker (i.e. the tip is at the origin). |