Flutter_map获取屏幕上的地理范围

import 'package:flutter_map/flutter_map.dart';

class MapSample extends StatefulWidget {
  @override
  _MapSampleState createState() => _MapSampleState();
}

class _MapSampleState extends State<MapSample> {
  MapController mapController;

  @override
  void initState() {
    super.initState();
    mapController = MapController();
  }

  @override
  Widget build(BuildContext context) {
    return FlutterMap(
      mapController: mapController,
      options: MapOptions(
        center: LatLng(45.5231, -122.6765), // 示例坐标
        zoom: 13.0,
      ),
      layers: [
        TileLayerOptions(
          urlTemplate: "https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png",
          subdomains: ['a', 'b', 'c'],
        ),
        // 其他图层...
      ],
    );
  }
}

void _showCurrentBounds() {
  if (mapController != null && mapController.bounds != null) {
    LatLngBounds bounds = mapController.bounds;
    LatLng southwest = bounds.southWest;
    LatLng northeast = bounds.northEast;

    print("当前视图的地理范围:");
    print("西南角: ${southwest.latitude}, ${southwest.longitude}");
    print("东北角: ${northeast.latitude}, ${northeast.longitude}");
  }
}

FloatingActionButton(
  onPressed: _showCurrentBounds,
  tooltip: 'Show Bounds',
  child: Icon(Icons.map),
);