getVisibleRegion method
Implementation
@override
Future<LatLngBounds> getVisibleRegion() async {
final bounds = _map.getBounds();
return LatLngBounds(
southwest: LatLng(
bounds.getSouthWest().lat as double,
bounds.getSouthWest().lng as double,
),
northeast: LatLng(
bounds.getNorthEast().lat as double,
bounds.getNorthEast().lng as double,
),
);
}