@Dzivo You should be able to use the CameraPositionState.projection and the android-maps-ktx library sphericalDistance() function to get the width of the screen in meters.

Something like this:

val upperLeftLatLng = cameraPositionState.projection.fromScreenLocation(Point(0, 0))
val upperRightLatLng = cameraPositionState.projection.fromScreenLocation(Point(0, size.width.toInt()))
val canvasWidthMeters = upperLeftLatLng.sphericalDistance(upperRightLatLng)

This is how I implemented the draft version of the ScaleBar in googlemaps/android-maps-ktx#175, which is sized to a percentage of the width of the screen.

Could you give that a shot and let me know if it works?

Here's what I ended up using in the ScaleBar port to maps-compose (see PR #157) to account for the cameraPositionState.projection being nullable:

val upperLeftLatLng =
	cameraPositionState.projection?.fromScreenLocation(Point(0, 0))
		?: LatLng(0.0, 0.0)
val upperRightLatLng =
	cameraPositionState.projection?.fromScreenLocation(Point(0, size.width.toInt()))
		?: LatLng(0.0, 0.0)
val canvasWidthMeters = upperLeftLatLng.sphericalDistance(upperRightLatLng)

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