# Constants

Import these from `@grafloria/renderer`.

## Constants

### `ALWAYS_SAFE_MODE`

Modes it is always safe to be in.

```ts
const ALWAYS_SAFE_MODE: BackendMode
```

### `CANVAS_LINK_HIT_TOLERANCE`

Link pick tolerance, in WORLD units.

Not a new number — it IS the floor `InteractionController` applies in SVG
mode, imported from the one place that owns it. Hit parity between the two
backends is therefore a property of the code, not a coincidence maintained by
two constants that happen to agree today. (The full grab distance is per
link — `linkBodyHitTolerance(strokeWidth)` — which both backends now use.)

```ts
const CANVAS_LINK_HIT_TOLERANCE: 5
```

### `IDENTITY`

```ts
const IDENTITY: Matrix
```

### `INHERITED_DEFAULTS`

Style values that INHERIT from a parent element in SVG.

```ts
const INHERITED_DEFAULTS: ComputedStyle
```

### `NULL_CONTEXT`

A `Canvas2DLike` that does nothing — the measure pass draws into it.

```ts
const NULL_CONTEXT: Canvas2DLike
```