Added MapProjectionFactory

MapControl/Shared/AutoEquirectangularProjection.cs

@@ -11,9 +11,11 @@ namespace MapControl
 {
     public class AutoEquirectangularProjection : MapProjection
     {
+        public const string DefaultCrsId = "AUTO2:42004";
+
         public AutoEquirectangularProjection()
         {
-            CrsId = "AUTO2:42004";
+            CrsId = DefaultCrsId;
         }
 
         public override Point LocationToMap(Location location)

MapControl/Shared/EquirectangularProjection.cs

@@ -18,9 +18,11 @@ namespace MapControl
     /// </summary>
     public class EquirectangularProjection : MapProjection
     {
+        public const string DefaultCrsId = "EPSG:4326";
+
         public EquirectangularProjection()
         {
-            CrsId = "EPSG:4326";
+            CrsId = DefaultCrsId;
         }
 
         public override bool IsNormalCylindrical

MapControl/Shared/GnomonicProjection.cs

@@ -14,9 +14,11 @@ namespace MapControl
     /// </summary>
     public class GnomonicProjection : AzimuthalProjection
     {
+        public const string DefaultCrsId = "AUTO2:97001"; // GeoServer non-standard CRS ID
+
         public GnomonicProjection()
         {
-            CrsId = "AUTO2:97001"; // GeoServer non-standard CRS ID
+            CrsId = DefaultCrsId;
         }
 
         public override Point LocationToMap(Location location)

MapControl/Shared/GroundOverlay.cs

@@ -27,7 +27,7 @@ using System.Windows.Media;
 
 namespace MapControl
 {
-    public class GroundOverlayPanel : MapPanel
+    public class GroundOverlay : MapPanel
     {
         class LatLonBox : BoundingBox
         {
@@ -56,8 +56,8 @@ namespace MapControl
         }
 
         public static readonly DependencyProperty SourcePathProperty = DependencyProperty.Register(
-            nameof(SourcePath), typeof(string), typeof(GroundOverlayPanel),
+            nameof(SourcePath), typeof(string), typeof(GroundOverlay),
-            new PropertyMetadata(null, async (o, e) => await ((GroundOverlayPanel)o).SourcePathPropertyChanged((string)e.NewValue)));
+            new PropertyMetadata(null, async (o, e) => await ((GroundOverlay)o).SourcePathPropertyChanged((string)e.NewValue)));
 
         public string SourcePath
         {

MapControl/Shared/MapProjection.cs

@@ -22,6 +22,8 @@ namespace MapControl
         public const double Wgs84Flattening = 1d / 298.257223563;
         public static readonly double Wgs84Eccentricity = Math.Sqrt((2d - Wgs84Flattening) * Wgs84Flattening);
 
+        public static MapProjectionFactory Factory { get; set; } = new MapProjectionFactory();
+
         /// <summary>
         /// Gets or sets the WMS 1.3.0 CRS identifier.
         /// </summary>

MapControl/Shared/MapProjectionFactory.cs

@@ -0,0 +1,51 @@
+// XAML Map Control - https://github.com/ClemensFischer/XAML-Map-Control
+// © 2022 Clemens Fischer
+// Licensed under the Microsoft Public License (Ms-PL)
+
+namespace MapControl
+{
+    public class MapProjectionFactory
+    {
+        public virtual MapProjection CreateProjection(string projectionDefinition)
+        {
+            MapProjection projection = null;
+
+            switch (projectionDefinition)
+            {
+                case WorldMercatorProjection.DefaultCrsId:
+                    projection = new WorldMercatorProjection();
+                    break;
+
+                case WebMercatorProjection.DefaultCrsId:
+                    projection = new WebMercatorProjection();
+                    break;
+
+                case EquirectangularProjection.DefaultCrsId:
+                    projection = new EquirectangularProjection();
+                    break;
+
+                case OrthographicProjection.DefaultCrsId:
+                    projection = new OrthographicProjection();
+                    break;
+
+                case AutoEquirectangularProjection.DefaultCrsId:
+                    projection = new AutoEquirectangularProjection();
+                    break;
+
+                case GnomonicProjection.DefaultCrsId:
+                    projection = new GnomonicProjection();
+                    break;
+
+                case StereographicProjection.DefaultCrsId:
+                    projection = new StereographicProjection();
+                    break;
+
+                case "EPSG:97003": // proprietary CRS ID
+                    projection = new AzimuthalEquidistantProjection { CrsId = projectionDefinition };
+                    break;
+            }
+
+            return projection;
+        }
+    }
+}

MapControl/Shared/OrthographicProjection.cs

@@ -14,9 +14,11 @@ namespace MapControl
     /// </summary>
     public class OrthographicProjection : AzimuthalProjection
     {
+        public const string DefaultCrsId = "AUTO2:42003";
+
         public OrthographicProjection()
         {
-            CrsId = "AUTO2:42003";
+            CrsId = DefaultCrsId;
         }
 
         public override Point LocationToMap(Location location)

MapControl/Shared/StereographicProjection.cs

@@ -14,9 +14,11 @@ namespace MapControl
     /// </summary>
     public class StereographicProjection : AzimuthalProjection
     {
+        public const string DefaultCrsId = "AUTO2:97002"; // GeoServer non-standard CRS ID
+
         public StereographicProjection()
         {
-            CrsId = "AUTO2:97002"; // GeoServer non-standard CRS ID
+            CrsId = DefaultCrsId;
         }
 
         public override Point LocationToMap(Location location)

MapControl/Shared/WebMercatorProjection.cs

@@ -15,11 +15,13 @@ namespace MapControl
     /// </summary>
     public class WebMercatorProjection : MapProjection
     {
+        public const string DefaultCrsId = "EPSG:3857";
+
         private static readonly double maxLatitude = YToLatitude(180d);
 
         public WebMercatorProjection()
         {
-            CrsId = "EPSG:3857";
+            CrsId = DefaultCrsId;
         }
 
         public override bool IsNormalCylindrical

MapControl/Shared/WorldMercatorProjection.cs

@@ -15,6 +15,8 @@ namespace MapControl
     /// </summary>
     public class WorldMercatorProjection : MapProjection
     {
+        public const string DefaultCrsId = "EPSG:3395";
+
         public static double ConvergenceTolerance { get; set; } = 1e-6;
         public static int MaxIterations { get; set; } = 10;
 
@@ -22,7 +24,7 @@ namespace MapControl
 
         public WorldMercatorProjection()
         {
-            CrsId = "EPSG:3395";
+            CrsId = DefaultCrsId;
         }
 
         public override bool IsNormalCylindrical

MapControl/UWP/MapControl.UWP.csproj

@@ -77,8 +77,8 @@
     <Compile Include="..\Shared\GnomonicProjection.cs">
       <Link>GnomonicProjection.cs</Link>
     </Compile>
-    <Compile Include="..\Shared\GroundOverlayPanel.cs">
+    <Compile Include="..\Shared\GroundOverlay.cs">
-      <Link>GroundOverlayPanel.cs</Link>
+      <Link>GroundOverlay.cs</Link>
     </Compile>
     <Compile Include="..\Shared\ImageFileCache.cs">
       <Link>ImageFileCache.cs</Link>
@@ -125,6 +125,9 @@
     <Compile Include="..\Shared\MapProjection.cs">
       <Link>MapProjection.cs</Link>
     </Compile>
+    <Compile Include="..\Shared\MapProjectionFactory.cs">
+      <Link>MapProjectionFactory.cs</Link>
+    </Compile>
     <Compile Include="..\Shared\MapScale.cs">
       <Link>MapScale.cs</Link>
     </Compile>

MapUiTools/Shared/MapProjectionsMenuButton.cs

@@ -26,7 +26,7 @@ namespace MapControl.UiTools
     public class MapProjectionItem
     {
         public string Text { get; set; }
-        public MapProjection Projection { get; set; }
+        public string Projection { get; set; }
     }
 
 #if WINUI || UWP
@@ -77,18 +77,18 @@ namespace MapControl.UiTools
         private void MapProjectionClicked(object sender, RoutedEventArgs e)
         {
             var item = (FrameworkElement)sender;
-            var projection = (MapProjection)item.Tag;
+            var projection = (string)item.Tag;
 
             SetMapProjection(projection);
         }
 
-        private void SetMapProjection(MapProjection projection)
+        private void SetMapProjection(string projection)
         {
-            Map.MapProjection = projection;
+            Map.MapProjection = MapProjection.Factory.CreateProjection(projection);
 
             foreach (var item in GetMenuItems())
             {
-                item.IsChecked = Map.MapProjection == (MapProjection)item.Tag;
+                item.IsChecked = projection == (string)item.Tag;
             }
         }
     }