getCenter method
Implementation
@override
Future<latlong.LatLng> getCenter() async {
final visibleRegion = await (await mapController.future).getVisibleRegion();
return latlong.LatLng(
visibleRegion.southwest.latitude +
((visibleRegion.northeast.latitude -
visibleRegion.southwest.latitude) /
2),
visibleRegion.southwest.longitude +
((visibleRegion.northeast.longitude -
visibleRegion.southwest.longitude) /
2),
);
}