> For the complete documentation index, see [llms.txt](https://api.lampix.co/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://api.lampix.co/application-development/lampixjs/api/transformrectcoords.md).

# transformRectCoords

Convert coordinates from a rectangle descriptor using camera coordinates to projector coordinates (or vice versa).

## Returns

(`Promise<RectCoords[]>`): A promise that fulfills with a list of rectangle descriptors with converted coordinates.

## Example

```javascript
import lampix from '@lampix/core';

lampix.transformRectCoords({
  posX: 100,
  posY: 200,
  width: 30,
  height: 100,
  camera: true
}).then((transformCoordinates) => {
  console.log(transformCoordinates[0]); // fictitious values: { posX: 200, posY: 400, width: 60, height: 200 }
});
```

## Notes

**It's important to understand** the difference between Lampix and the simulator when using this function:

* Lampix will return real coordinates as seen in either the camera or the projector.
* The simulator will return values that depend on the `scaleFactor` property in its config, which defaults to `1`, meaning it will return the same values if the `scaleFactor` was not changed.


---

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