Question

我正在使用Windows 10中的MapControl，我希望允许用户拖动引脚，当用户放下引脚时，想要获取该位置的纬度和经度，并使用API获取位置地址。我添加了Map使用以下代码的图标

MapControl map = frameworkElement as MapControl;
map.MapServiceToken= "my service token";
BasicGeoposition councilPosition = new BasicGeoposition()
{
     Latitude = Convert.ToDouble(Info.GetType().GetRuntimeProperty("LATITUDE").GetValue(councilInfo, null)),
     Longitude = Convert.ToDouble(Info.GetType().GetRuntimeProperty("LONGITUDE").GetValue(councilInfo, null))
};

Geopoint pinPoint = new Geopoint(councilPosition);

MapIcon locationPin = new MapIcon();
locationPin.Image= RandomAccessStreamReference.CreateFromUri(new Uri("ms-appx:///Images/pushpin.png"));
locationPin.Title = councilInfo.COUNCIL_NAME;
locationPin.CollisionBehaviorDesired = MapElementCollisionBehavior.RemainVisible;
locationPin.Location = councilPoint;
locationPin.NormalizedAnchorPoint = new Point(0.5, 1.0);
locationPin.ZIndex = 0;

map.MapElements.Add(locationPin);
await map.TrySetViewAsync(locationPin.Location, 15D, 0, 0, MapAnimationKind.Bow);

有人可以建议使用哪些事件来实现选择位置功能吗？

Answer 1

请参阅此link。他们使用XAML指定了显示点。您可以使用带有背景图钉图像的网格而不是边框，聆听该网格的操作事件。

这是实现我上面所说的代码。

    private void MainPage_Loaded(object sender, RoutedEventArgs e)
        {
            BasicGeoposition snPosition = new BasicGeoposition() { Latitude = 47.7356039173901, Longitude = -122.310697222129

            };
            Geopoint snPoint = new Geopoint(snPosition);

            // Create a XAML border.
            Grid grid = new Grid
            {
                Width=100,
                Height=100,
                Background = new ImageBrush() {ImageSource= new BitmapImage(new Uri("ms-appx:///Assets/icon.png", UriKind.RelativeOrAbsolute)), Stretch = Stretch.UniformToFill}
            };
              grid.ManipulationMode = ManipulationModes.TranslateX|ManipulationModes.TranslateY;
 grid.ManipulationCompleted += Grid_ManipulationCompleted;
            grid.ManipulationDelta +=Grid_ManipulationDelta;
            // Center the map over the POI.
            MapControl1.Center = snPoint;
            MapControl1.ZoomLevel = 14;
            CompositeTransform tran = new CompositeTransform();
            grid.RenderTransform = tran;
            // Add XAML to the map.
            MapControl1.Children.Add(grid);
            MapControl.SetLocation(grid, snPoint);
            MapControl.SetNormalizedAnchorPoint(grid, new Point(0.5, 0.5));
        }  

        private void Grid_ManipulationDelta(object sender, ManipulationDeltaRoutedEventArgs e)
        {
            Grid grid = sender as Grid;
            CompositeTransform xform = grid.RenderTransform as CompositeTransform;


            xform.TranslateX += e.Delta.Translation.X;
            xform.TranslateY += e.Delta.Translation.Y;
         //   Rect point = grid.TransformToVisual(MapControl1).TransformBounds(new Rect(0,0, grid.Width, grid.Height));

            e.Handled = true;
          //  Geopoint gPoint;
           // MapControl1.GetLocationFromOffset(new Point(point.X, point.Y), out gPoint);
           // Debug.WriteLine(gPoint.Position.Latitude);
           // Debug.WriteLine(gPoint.Position.Longitude);
        }

  private void Grid_ManipulationCompleted(object sender, ManipulationCompletedRoutedEventArgs e)
        {
            Grid grid = sender as Grid;
            Rect point = grid.TransformToVisual(MapControl1).TransformBounds(new Rect(0, 0, grid.Width, grid.Height);
            Geopoint gPoint;
            MapControl1.GetLocationFromOffset(new Point(point.X, point.Y), out gPoint);
            Debug.WriteLine(gPoint.Position.Latitude);
            Debug.WriteLine(gPoint.Position.Longitude);
        }

拖动后获取的位置不准确。关于如何将准确点wrt提取到MapControl

，你可以做一下R＆amp; D

Answer 2

我无法获得公认的工作答案。经过this answer的大量研究和帮助，我终于使它起作用了。这是一个工作示例：

    public sealed partial class MainPage : Page
    {
        public MainPage()
        {
            InitializeComponent();

            var position = new Geopoint(new BasicGeoposition
            {
                Latitude = 30.3618,
                Longitude = -91.1067
            });
            var grid = new Grid
            {
                Width = 32,
                Height = 50
            };
            var pushpin = new Image()
            {
                Source = new BitmapImage(new Uri("ms-appx:///Assets/Pushpin.png")),
                Stretch = Stretch.Uniform,
                ManipulationMode = ManipulationModes.TranslateX | ManipulationModes.TranslateY,
                RenderTransform = new TranslateTransform()
            };
            pushpin.ManipulationStarted += Pushpin_ManipulationStarted;
            pushpin.ManipulationDelta += Pushpin_ManipulationDelta;
            pushpin.ManipulationCompleted += Pushpin_ManipulationCompleted;
            grid.Children.Add(pushpin);

            Map.Center = position;
            Map.Children.Add(grid);
            MapControl.SetLocation(grid, position);
            MapControl.SetNormalizedAnchorPoint(grid, new Point(0.5, 1));
        }

        private Geopoint GetPosition(Image pushpin)
        {
            var grid = pushpin.Parent as Grid;
            var anchor = MapControl.GetNormalizedAnchorPoint(grid);
            var offset = pushpin.TransformToVisual(Map).TransformPoint(new Point(grid.Width * anchor.X, grid.Height * anchor.Y));
            Map.GetLocationFromOffset(offset, out Geopoint position);
            return position;
        }

        private void Pushpin_ManipulationCompleted(object sender, ManipulationCompletedRoutedEventArgs e)
        {
            Map.PanInteractionMode = MapPanInteractionMode.Auto;

            var pushpin = sender as Image;
            var grid = pushpin.Parent as Grid;
            var position = GetPosition(pushpin);
            MapControl.SetLocation(grid, position);
            var transform = pushpin.RenderTransform as TranslateTransform;
            transform.X = 0;
            transform.Y = 0;
        }

        private void Pushpin_ManipulationDelta(object sender, ManipulationDeltaRoutedEventArgs e)
        {
            var pushpin = sender as Image;
            var transform = pushpin.RenderTransform as TranslateTransform;
            transform.X += e.Delta.Translation.X;
            transform.Y += e.Delta.Translation.Y;
        }

        private void Pushpin_ManipulationStarted(object sender, ManipulationStartedRoutedEventArgs e)
        {
            Map.PanInteractionMode = MapPanInteractionMode.Disabled;
        }
    }

如何在Windows 10中创建可拖动的引脚以提供选择位置功能？

2 个答案: