markers.dart

 Future<void> _goToNewYork() async {
    double lat = 40.7128;
    double long = -74.0060;
    GoogleMapController controller = await _controller.future;
    controller.animateCamera(CameraUpdate.newLatLngZoom(LatLng(lat, long), _zoom));
    setState(() {
      _markers.add(
        Marker(
            markerId: MarkerId('newyork'),
            position: LatLng(lat, long),
        ),
      );
    });
  }