Flutter Maps - An Interactive Maps Widget

//Shapelayer 

late List<Model> _australiaData;
late MapShapeSource _mapShapeSource;

@override
void initState() {
  _australiaData = const <Model>[
    Model('New South Wales', Color.fromRGBO(255, 215, 0, 1.0),
        '       New\nSouth Wales'),
    Model('Queensland', Color.fromRGBO(72, 209, 204, 1.0), 'Queensland'),
    Model('Northern Territory', Color.fromRGBO(255, 78, 66, 1.0),
        'Northern\nTerritory'),
    Model('Victoria', Color.fromRGBO(171, 56, 224, 0.75), 'Victoria'),
    Model('South Australia', Color.fromRGBO(126, 247, 74, 0.75),
        'South Australia'),
    Model('Western Australia', Color.fromRGBO(79, 60, 201, 0.7),
        'Western Australia'),
    Model('Tasmania', Color.fromRGBO(99, 164, 230, 1), 'Tasmania'),
    Model('Australian Capital Territory', Colors.teal, 'ACT')
  ];
  
  _mapShapeSource = MapShapeSource.asset(
    'assets/australia.json',
    shapeDataField: 'STATE_NAME',
    dataCount: _australiaData.length,
    primaryValueMapper: (int index) => _australiaData[index].state,
    dataLabelMapper: (int index) => _australiaData[index].stateCode,
    shapeColorValueMapper: (int index) => _australiaData[index].color,
  );

  super.initState();
}

@override
Widget build(BuildContext context) {
  return Scaffold(
    body: SfMaps(
      layers: <MapShapeLayer>[
        MapShapeLayer(
          source: _mapShapeSource,
          showDataLabels: true,
          legend: const MapLegend(MapElement.shape),
          shapeTooltipBuilder: (BuildContext context, int index) {
            return Padding(
              padding: const EdgeInsets.all(10.0),
              child: Text(
                _australiaData[index].stateCode,
                style: const TextStyle(color: Colors.white),
              ),
            );
          },
        ),
      ],
    ),
  );
}

//Tilelayer

late MapZoomPanBehavior _zoomPanBehavior;

@override
void initState() {
  _zoomPanBehavior = MapZoomPanBehavior(minZoomLevel: 4.0);
  super.initState();
}

@override
Widget build(BuildContext context) {
  return Scaffold(
    body: SfMaps(
      layers: <MapTileLayer>[
        MapTileLayer(
          urlTemplate: 'https://tile.openstreetmap.org/{z}/{x}/{y}.png',
          initialZoomLevel: 4,
          initialFocalLatLng: const MapLatLng(40.7128, -74.0060),
          zoomPanBehavior: _zoomPanBehavior,
          initialMarkersCount: 1,
          markerBuilder: (BuildContext context, int index) {
            return const MapMarker(
              latitude: 40.7128,
              longitude: -74.0060,
              child: Icon(Icons.location_on, color: Colors.red),
            );
          },
        ),
      ],
    ),
  );
}