Flutter:如何根据坐标定位标志图像？

import 'package:flutter/material.dart';
import 'package:flutter_map/flutter_map.dart';
import 'package:latlong/latlong.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Map Example',
      home: Scaffold(
        appBar: AppBar(
          title: Text('Flutter Map Example'),
        ),
        body: MapView(),
      ),
    );
  }
}

class MapView extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return FlutterMap(
      options: MapOptions(
        center: LatLng(37.7749, -122.4194), // 设置地图初始位置
        zoom: 13.0, // 设置地图初始缩放级别
      ),
      layers: [
        TileLayerOptions(
          urlTemplate: 'https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png',
          subdomains: ['a', 'b', 'c'],
        ),
        MarkerLayerOptions(
          markers: [
            Marker(
              width: 80.0,
              height: 80.0,
              point: LatLng(37.7749, -122.4194), // 设置标志图像的坐标位置
              builder: (ctx) => Container(
                child: FlutterLogo(), // 使用自定义的图标
              ),
            ),
          ],
        ),
      ],
    );
  }
}