Avalonia sample application

SampleApps/AvaloniaApp/MainWindow.axaml

@@ -14,7 +14,15 @@
                  ZoomLevel="11" MinZoomLevel="3"
                  Center="53.5,8.2"
                  ManipulationModes="All"
-                 DoubleTapped="MapDoubleTapped">
+                 DoubleTapped="MapDoubleTapped"
+                 PointerPressed="MapPointerPressed"
+                 PointerReleased="MapPointerReleased"
+                 PointerMoved="MapPointerMoved"
+                 PointerExited="MapPointerExited">
+
+            <map:MapPolyline x:Name="measurementLine" IsVisible="False"
+                             Stroke="{Binding Foreground, ElementName=map}"
+                             StrokeThickness="2" StrokeDashArray="1,1"/>
 
             <map:MapItemsControl ItemsSource="{Binding Polylines}">
                 <map:MapItemsControl.ItemTemplate>
@@ -92,6 +100,15 @@
             <map:Pushpin AutoCollapse="True" Location="53.5,8.2" Content="N 53°30' E 8°12'"/>
         </map:Map>
 
+        <TextBlock x:Name="mouseLocation"
+                   HorizontalAlignment="Center" VerticalAlignment="Top" Margin="4" Padding="4,2"
+                   FontFamily="Consolas" IsHitTestVisible="False" IsVisible="False"
+                   Foreground="{Binding Foreground, ElementName=map}">
+            <TextBlock.Background>
+                <SolidColorBrush Color="{Binding Background.Color, ElementName=map}" Opacity="0.5"/>
+            </TextBlock.Background>
+        </TextBlock>
+
         <StackPanel Orientation="Horizontal" HorizontalAlignment="Right" VerticalAlignment="Bottom" Background="#7FFFFFFF"
                     DataContext="{Binding MapLayer, ElementName=map}">
             <ProgressBar Width="100" Height="8" Margin="4,2" VerticalAlignment="Center"

SampleApps/AvaloniaApp/MainWindow.axaml.cs

@@ -1,7 +1,9 @@
 using Avalonia.Controls;
 using Avalonia.Input;
 using MapControl;
+using System;
 using System.Diagnostics;
+using System.Globalization;
 using System.Linq;
 
 namespace SampleApplication
@@ -29,6 +31,11 @@ namespace SampleApplication
             Debug.WriteLine("SelectedItems: " + string.Join(", ", ((MapItemsControl)sender).SelectedItems.OfType<PointItem>().Select(item => item.Name)));
         }
 
+        private void ResetHeadingButtonClick(object sender, Avalonia.Interactivity.RoutedEventArgs e)
+        {
+            map.TargetHeading = 0d;
+        }
+
         private void MapItemsControlDoubleTapped(object sender, TappedEventArgs e)
         {
             e.Handled = true; // prevent MapDoubleTapped
@@ -39,9 +46,104 @@ namespace SampleApplication
             map.TargetCenter = map.ViewToLocation(e.GetPosition(map));
         }
 
-        private void ResetHeadingButtonClick(object sender, Avalonia.Interactivity.RoutedEventArgs e)
+        private void MapPointerPressed(object sender, PointerPressedEventArgs e)
         {
-            map.TargetHeading = 0d;
+            if (e.Pointer.Type == PointerType.Mouse)
+            {
+                var point = e.GetCurrentPoint(map);
+
+                if (point.Properties.IsRightButtonPressed)
+                {
+                    e.Pointer.Capture(map);
+                    var location = map.ViewToLocation(point.Position);
+
+                    if (location != null)
+                    {
+                        measurementLine.IsVisible = true;
+                        measurementLine.Locations = new LocationCollection(location);
+                    }
+                }
+            }
+        }
+
+        private void MapPointerReleased(object sender, PointerReleasedEventArgs e)
+        {
+            if (e.Pointer.Captured == map)
+            {
+                e.Pointer.Capture(null);
+                measurementLine.IsVisible = false;
+                measurementLine.Locations = null;
+            }
+        }
+
+        private void MapPointerMoved(object sender, PointerEventArgs e)
+        {
+            var location = map.ViewToLocation(e.GetPosition(map));
+
+            if (location != null)
+            {
+                mouseLocation.IsVisible = true;
+                mouseLocation.Text = GetLatLonText(location);
+
+                var start = measurementLine.Locations?.FirstOrDefault();
+
+                if (start != null)
+                {
+                    measurementLine.Locations = LocationCollection.OrthodromeLocations(start, location);
+                    mouseLocation.Text += GetDistanceText(location.GetDistance(start));
+                }
+            }
+            else
+            {
+                mouseLocation.IsVisible = false;
+                mouseLocation.Text = "";
+            }
+        }
+
+        private void MapPointerExited(object sender, PointerEventArgs e)
+        {
+            mouseLocation.IsVisible = false;
+            mouseLocation.Text = "";
+        }
+
+        private static string GetLatLonText(MapControl.Location location)
+        {
+            var latitude = (int)Math.Round(location.Latitude * 60000d);
+            var longitude = (int)Math.Round(MapControl.Location.NormalizeLongitude(location.Longitude) * 60000d);
+            var latHemisphere = 'N';
+            var lonHemisphere = 'E';
+
+            if (latitude < 0)
+            {
+                latitude = -latitude;
+                latHemisphere = 'S';
+            }
+
+            if (longitude < 0)
+            {
+                longitude = -longitude;
+                lonHemisphere = 'W';
+            }
+
+            return string.Format(CultureInfo.InvariantCulture,
+                "{0}  {1:00} {2:00.000}\n{3} {4:000} {5:00.000}",
+                latHemisphere, latitude / 60000, (latitude % 60000) / 1000d,
+                lonHemisphere, longitude / 60000, (longitude % 60000) / 1000d);
+        }
+
+        private string GetDistanceText(double distance)
+        {
+            var unit = "m";
+
+            if (distance >= 1000d)
+            {
+                distance /= 1000d;
+                unit = "km";
+            }
+
+            var distanceFormat = distance >= 100d ? "F0" : "F1";
+
+            return string.Format(CultureInfo.InvariantCulture, "\n   {0:" + distanceFormat + "} {1}", distance, unit);
         }
     }
 }

SampleApps/UniversalApp/MainPage.xaml.cs

@@ -45,7 +45,7 @@ namespace SampleApplication
             {
                 var point = e.GetCurrentPoint(map);
 
-                if (point.Properties.IsRightButtonPressed)
+                if (point.Properties.IsRightButtonPressed && map.CapturePointer(e.Pointer))
                 {
                     var location = map.ViewToLocation(point.Position);
 
@@ -55,8 +55,7 @@ namespace SampleApplication
                         measurementLine.Locations = new LocationCollection(location);
                     }
                 }
-                else if (e.KeyModifiers.HasFlag(VirtualKeyModifiers.Control) &&
+                else if (e.KeyModifiers.HasFlag(VirtualKeyModifiers.Control) && map.MapLayer is WmsImageLayer wmsLayer)
-                    map.MapLayer is WmsImageLayer wmsLayer)
                 {
                     Debug.WriteLine(await wmsLayer.GetFeatureInfoAsync(point.Position));
                 }
@@ -65,8 +64,12 @@ namespace SampleApplication
 
         private void MapPointerReleased(object sender, PointerRoutedEventArgs e)
         {
-            measurementLine.Visibility = Visibility.Collapsed;
+            if (e.Pointer.PointerDeviceType == PointerDeviceType.Mouse)
-            measurementLine.Locations = null;
+            {
+                map.ReleasePointerCapture(e.Pointer);
+                measurementLine.Visibility = Visibility.Collapsed;
+                measurementLine.Locations = null;
+            }
         }
 
         private void MapPointerMoved(object sender, PointerRoutedEventArgs e)

SampleApps/WinUiApp/MainWindow.xaml.cs

@@ -57,7 +57,7 @@ namespace SampleApplication
             {
                 var point = e.GetCurrentPoint(map);
 
-                if (point.Properties.IsRightButtonPressed)
+                if (point.Properties.IsRightButtonPressed && map.CapturePointer(e.Pointer))
                 {
                     var location = map.ViewToLocation(point.Position);
 
@@ -67,8 +67,7 @@ namespace SampleApplication
                         measurementLine.Locations = new LocationCollection(location);
                     }
                 }
-                else if (e.KeyModifiers.HasFlag(VirtualKeyModifiers.Control) &&
+                else if (e.KeyModifiers.HasFlag(VirtualKeyModifiers.Control) && map.MapLayer is WmsImageLayer wmsLayer)
-                    map.MapLayer is WmsImageLayer wmsLayer)
                 {
                     Debug.WriteLine(await wmsLayer.GetFeatureInfoAsync(point.Position));
                 }
@@ -77,8 +76,12 @@ namespace SampleApplication
 
         private void MapPointerReleased(object sender, PointerRoutedEventArgs e)
         {
-            measurementLine.Visibility = Visibility.Collapsed;
+            if (e.Pointer.PointerDeviceType == PointerDeviceType.Mouse)
-            measurementLine.Locations = null;
+            {
+                map.ReleasePointerCapture(e.Pointer);
+                measurementLine.Visibility = Visibility.Collapsed;
+                measurementLine.Locations = null;
+            }
         }
 
         private void MapPointerMoved(object sender, PointerRoutedEventArgs e)

SampleApps/WpfApplication/MainWindow.xaml.cs

@@ -5,6 +5,7 @@ using System.Globalization;
 using System.Linq;
 using System.Windows;
 using System.Windows.Controls;
+using System.Windows.Data;
 using System.Windows.Input;
 
 namespace SampleApplication
@@ -61,7 +62,7 @@ namespace SampleApplication
         {
             var location = map.ViewToLocation(e.GetPosition(map));
 
-            if (location != null)
+            if (location != null && map.CaptureMouse())
             {
                 measurementLine.Visibility = Visibility.Visible;
                 measurementLine.Locations = new LocationCollection(location);
@@ -70,6 +71,7 @@ namespace SampleApplication
 
         private void MapMouseRightButtonUp(object sender, MouseButtonEventArgs e)
         {
+            map.ReleaseMouseCapture();
             measurementLine.Visibility = Visibility.Collapsed;
             measurementLine.Locations = null;
         }