如何居中/设置地图缩放以覆盖Xamarin.Forms上可见的所有标记？ [英] How to Center/Set Zoom of Map to cover all markers visible on Xamarin.Forms?

问题描述

我为我的地图设置了多个标记

我可以静态设置缩放级别和中心

但我想要的是居中到所有标记和缩放级别来填充所有可见的标记

我可以使用接收MapSpan的Gmaps.MoveToRegion方法。事情是，我不知道如何计算MapSpan需要显示所有标记。

我使用Xamarin.Forms.Maps和Xam.Plugin。 MapExtend.Abstractions

预先感谢！

解决方案

与下面的C＃代码。

  locationManager =（LocationManager）GetSystemService（Context.LocationService）; 
 
 Criteria criteria = new Criteria（）; 
 
 criteria.Accuracy = Accuracy.Fine; 
 criteria.PowerRequirement = Power.Low; 
 
 provider = locationManager.GetBestProvider（criteria，true）; 
 
 location = locationManager.GetLastKnownLocation（provider）; 
 
 marker1lat = location.Latitude; 
 marker1lng = location.Longitude; 
 
 marker2lat = location.Latitude; 
 marker2lng = location.Longitude; 
 
 LatLng marker1LatLng = new LatLng（marker1lat，marker1lng）; 
 Latlng marker2LatLng = new LatLng（marker2lat，marker2lng）; 
 
 LatLngBounds.Builder b = new LatLngBounds.Builder（）
 .Include（marker1LatLng）
 .Include（marker2LatLng）; 
 
 mMap.MoveCamera（CameraUpdateFactory.NewLatLngBounds（b.Build（），120））; 
  

I am setting multiple markers to My Map

I can set statically the zoom levels and the center

but what i want is To Center to all markers and zoom level to fill all visible markers

I can use the Gmaps.MoveToRegion method which receives a MapSpan. The thing is, I don't know how to calculate the MapSpan needed to show all the markers.

I'm using Xamarin.Forms.Maps and Xam.Plugin.MapExtend.Abstractions

Thanks in advance!

解决方案

I had success with the below c# code. Just record the position of each marker as a LatLng object.

locationManager = (LocationManager)GetSystemService(Context.LocationService);

Criteria criteria = new Criteria();

criteria.Accuracy = Accuracy.Fine;
criteria.PowerRequirement = Power.Low;

provider = locationManager.GetBestProvider(criteria, true);

location = locationManager.GetLastKnownLocation(provider);

marker1lat = location.Latitude;
marker1lng = location.Longitude;

marker2lat = location.Latitude;
marker2lng = location.Longitude;

LatLng marker1LatLng = new LatLng(marker1lat, marker1lng);
Latlng marker2LatLng = new LatLng(marker2lat, marker2lng);

LatLngBounds.Builder b = new LatLngBounds.Builder()
                    .Include(marker1LatLng)
                    .Include(marker2LatLng);

mMap.MoveCamera(CameraUpdateFactory.NewLatLngBounds(b.Build(), 120));

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