Flutter adjust/scale google 基于圆半径的地图缩放级别

Question

我想根据圆的半径缩放 google 地图缩放级别。从技术上讲，我希望用户以最佳缩放级别在地图上看到圆圈。我尝试获取边界并调整相机位置，但圆圈没有任何此类边界参数..

GoogleMap(
            onMapCreated: (GoogleMapController controller) {
               controller.showMarkerInfoWindow(MarkerId("0"));
            },
            circles: Set.from([
              Circle(
                circleId: CircleId("0"),
                center: LatLng(...),
                radius: 1000,
              )
            ]),
            initialCameraPosition: CameraPosition(
              target: LatLng(..),
              **zoom: 15, // I want to scale zoom based on radius of circle.**
            ),
            markers: {
              Marker(
                markerId: MarkerId("0"),
                position: LatLng(..),
                infoWindow: InfoWindow(title: ...)
              )
            },
          ),
        ),

提前致谢。

Answer 1

经过一番搜索，找到了一个解决方案 here，它在 java 中用于 android 应用程序。

dart/flutter 代码如下：

double getZoomLevel(double radius) {
    double zoomLevel = 11;
    if (radius > 0) {
      double radiusElevated = radius + radius / 2;
      double scale = radiusElevated / 500;
      zoomLevel = 16 - log(scale) / log(2);
    }
    zoomLevel = num.parse(zoomLevel.toStringAsFixed(2));
    return zoomLevel;
  }

Flutter adjust/scale google 基于圆半径的地图缩放级别

Flutter adjust/scale google map zoom level based on circle radius

flutter

google-maps-flutter