getLatLng method
Returns the LatLng for a screenCoordinate (in pixels) of the viewport.
Implementation
Future<LatLng> getLatLng(ScreenCoordinate screenCoordinate) async {
assert(_googleMap != null, 'Cannot get the lat, lng of a screen coordinate with a null map.');
final gmaps.LatLng latLng = _pixelToLatLng(_googleMap!, screenCoordinate.x, screenCoordinate.y);
return gmLatLngToLatLng(latLng);
}