# LabelsHandle

> Talos next · Since 0.6

World-space text labels.

Reached in a behaviour as `ctx.labels`.

## Signature

```ts
export interface LabelsHandle {
  /** Create or update label `id` showing string `textKey` at a point or following an entity. */
  set(id: string, textKey: string, at: Target): void
  clear(id: string): void
}
```

Import: `import type { LabelsHandle } from "@argus/api"`

## Members

| Member | Signature | Description |
|---|---|---|
| `set` | `set(id: string, textKey: string, at: Target): void` | Create or update label `id` showing string `textKey` at a point or following an entity. |
| `clear` | `clear(id: string): void` |  |

## Example

The tested fixture `fixtures/recipes/jump-pad-and-elevator/scenes/behaviors/camera-zone.ts`.

```ts
import type { Behavior } from "@argus/api"

/**
 * A trigger volume that retunes the camera while the player is inside it.
 *
 * The engine has no camera-zone concept and needs none: a volume, a `trigger` component and this.
 * Here the player's behaviour owns the camera (it re-sends its params when the view is turned), so
 * the zone tells it what to change rather than calling `ctx.camera.set` itself. In a scene where
 * nothing else writes the camera, the zone can call `ctx.camera.set(kind, params)` directly.
 */
interface Props {
  /** `ctx.camera.set` params to merge in on the way in, and on the way out. */
  inside?: Record<string, unknown>
  outside?: Record<string, unknown>
}

export default {
  onTrigger(ctx, trigger) {
    const params = trigger.entering ? ctx.props.inside : ctx.props.outside
    if (params) ctx.events.emit("camera-zone", { target: trigger.other.id, params })
  },
} satisfies Behavior<Record<string, never>, Props>
```