如何在地图控件上绘制路线？

Question

我在我的用户界面中添加了一张地图，并希望显示从设备当前位置到某个位置（例如餐厅）的路线。我怎样才能做到这一点？

Answer 1

我不知道你在看什么技术，但是如果你想在Windows上看到类似的东西 - UWP平台提供了计算路线的方法，然后将其绘制在地图上。

您需要的是MapControl和MapRouteFinder来计算从开始GPS位置到结束GPS位置的路线。从结果中，您可以创建一个MapRouteView，可以将其添加到MapControl。请记住检查appmanifest中的Location功能。你可以这样做：

// get the user's consent to determine the location 
var status = await Geolocator.RequestAccessAsync(); 
if (status == GeolocationAccessStatus.Allowed) 
{ 
    // get the current position 
    Geolocator locator = new Geolocator() { DesiredAccuracy = PositionAccuracy.High }; 
    Geoposition pos = await locator.GetGeopositionAsync(); 
    BasicGeoposition current = new BasicGeoposition() 
      { Latitude = pos.Coordinate.Latitude, 
       Longitude = pos.Coordinate.Longitude }; 

    // set the lat/long of the restaurant 
    BasicGeoposition restaurant = new BasicGeoposition() 
      { Latitude = 51.91997, Longitude = 4.486515 }; 

    // get the driving route 
    MapRouteFinderResult route = 
      await MapRouteFinder.GetDrivingRouteAsync(new Geopoint(current), 
                 new Geopoint(restaurant), 
                 MapRouteOptimization.Time, 
                 MapRouteRestrictions.None); 
    // get the view and add it to the map 
    MapRouteView routeView = new MapRouteView(route.Route); 
    routeView.RouteColor = Windows.UI.Colors.Red; 
    TheMap.Routes.Add(routeView); 

    // change the view of the map to see the complete route 
    await TheMap.TrySetViewBoundsAsync(route.Route.BoundingBox, 
             null, MapAnimationKind.Default); 
}