MapProjection.Factory

MapControl/Shared/GeoImage.cs

@@ -194,7 +194,7 @@ namespace MapControl
                 {
                     var epsgCode = geoKeyDirectory[i + 3];
 
-                    return MapProjectionFactory.Instance.GetProjection($"EPSG:{epsgCode}");
+                    return MapProjection.Parse($"EPSG:{epsgCode}");
                 }
             }
 

MapControl/Shared/MapProjection.cs

@@ -31,6 +31,14 @@ namespace MapControl
         public const double Wgs84Flattening = 1d / 298.257223563;
         public static readonly double Wgs84Eccentricity = Math.Sqrt((2d - Wgs84Flattening) * Wgs84Flattening);
 
+        private static MapProjectionFactory factory;
+
+        public static MapProjectionFactory Factory
+        {
+            get => factory ??= new MapProjectionFactory();
+            set => factory = value;
+        }
+
         /// <summary>
         /// Gets the type of the projection.
         /// </summary>
@@ -147,7 +155,7 @@ namespace MapControl
         /// </summary>
         public static MapProjection Parse(string crsId)
         {
-            return MapProjectionFactory.Instance.GetProjection(crsId);
+            return Factory.GetProjection(crsId);
         }
     }
 }

MapControl/Shared/MapProjectionFactory.cs

@@ -4,14 +4,6 @@ namespace MapControl
 {
     public class MapProjectionFactory
     {
-        private static MapProjectionFactory instance;
-
-        public static MapProjectionFactory Instance
-        {
-            get => instance ??= new MapProjectionFactory();
-            set => instance = value;
-        }
-
         public virtual MapProjection GetProjection(string crsId)
         {
             MapProjection projection = null;
@@ -75,28 +67,14 @@ namespace MapControl
             return projection ?? throw new NotSupportedException($"MapProjection \"{crsId}\" is not supported.");
         }
 
-        public virtual MapProjection GetProjection(int epsgCode)
+        public virtual MapProjection GetProjection(int epsgCode) => epsgCode switch
         {
-            switch (epsgCode)
+            var code when code >= Etrs89UtmProjection.FirstZoneEpsgCode && code <= Etrs89UtmProjection.LastZoneEpsgCode => new Etrs89UtmProjection(epsgCode % 100),
-            {
+            var code when code >= Nad27UtmProjection.FirstZoneEpsgCode && code <= Nad27UtmProjection.LastZoneEpsgCode => new Nad27UtmProjection(epsgCode % 100),
-                case var c when c >= Etrs89UtmProjection.FirstZoneEpsgCode && c <= Etrs89UtmProjection.LastZoneEpsgCode:
+            var code when code >= Nad83UtmProjection.FirstZoneEpsgCode && code <= Nad83UtmProjection.LastZoneEpsgCode => new Nad83UtmProjection(epsgCode % 100),
-                    return new Etrs89UtmProjection(epsgCode % 100);
+            var code when code >= Wgs84UtmProjection.FirstZoneNorthEpsgCode && code <= Wgs84UtmProjection.LastZoneNorthEpsgCode => new Wgs84UtmProjection(epsgCode % 100, true),
-
+            var code when code >= Wgs84UtmProjection.FirstZoneSouthEpsgCode && code <= Wgs84UtmProjection.LastZoneSouthEpsgCode => new Wgs84UtmProjection(epsgCode % 100, false),
-                case var c when c >= Nad27UtmProjection.FirstZoneEpsgCode && c <= Nad27UtmProjection.LastZoneEpsgCode:
+            _ => null
-                    return new Nad27UtmProjection(epsgCode % 100);
+        };
-
-                case var c when c >= Nad83UtmProjection.FirstZoneEpsgCode && c <= Nad83UtmProjection.LastZoneEpsgCode:
-                    return new Nad83UtmProjection(epsgCode % 100);
-
-                case var c when c >= Wgs84UtmProjection.FirstZoneNorthEpsgCode && c <= Wgs84UtmProjection.LastZoneNorthEpsgCode:
-                    return new Wgs84UtmProjection(epsgCode % 100, true);
-
-                case var c when c >= Wgs84UtmProjection.FirstZoneSouthEpsgCode && c <= Wgs84UtmProjection.LastZoneSouthEpsgCode:
-                    return new Wgs84UtmProjection(epsgCode % 100, false);
-
-                default:
-                    return null;
-            }
-        }
     }
 }

MapProjections/Shared/GeoApiProjectionFactory.cs

@@ -4,64 +4,25 @@ namespace MapControl.Projections
 {
     public class GeoApiProjectionFactory : MapProjectionFactory
     {
-        public static GeoApiProjectionFactory GetInstance()
+        public Dictionary<int, string> CoordinateSystemWkts { get; } = [];
+
+        public override MapProjection GetProjection(string crsId) => crsId switch
         {
-            if (!(Instance is GeoApiProjectionFactory factory))
+            MapControl.WebMercatorProjection.DefaultCrsId => new WebMercatorProjection(),
-            {
+            MapControl.WorldMercatorProjection.DefaultCrsId => new WorldMercatorProjection(),
-                factory = new GeoApiProjectionFactory();
+            MapControl.Wgs84AutoUtmProjection.DefaultCrsId => new Wgs84AutoUtmProjection(),
-                Instance = factory;
+            _ => base.GetProjection(crsId)
-            }
+        };
 
-            return factory;
+        public override MapProjection GetProjection(int epsgCode) => epsgCode switch
-        }
-
-        public override MapProjection GetProjection(string crsId)
         {
-            switch (crsId)
+            var code when code >= Ed50UtmProjection.FirstZoneEpsgCode && code <= Ed50UtmProjection.LastZoneEpsgCode => new Ed50UtmProjection(epsgCode % 100),
-            {
+            var code when code >= Etrs89UtmProjection.FirstZoneEpsgCode && code <= Etrs89UtmProjection.LastZoneEpsgCode => new Etrs89UtmProjection(epsgCode % 100),
-                case MapControl.WebMercatorProjection.DefaultCrsId:
+            var code when code >= Nad27UtmProjection.FirstZoneEpsgCode && code <= Nad27UtmProjection.LastZoneEpsgCode => new Nad27UtmProjection(epsgCode % 100),
-                    return new WebMercatorProjection();
+            var code when code >= Nad83UtmProjection.FirstZoneEpsgCode && code <= Nad83UtmProjection.LastZoneEpsgCode => new Nad83UtmProjection(epsgCode % 100),
-
+            var code when code >= Wgs84UtmProjection.FirstZoneNorthEpsgCode && code <= Wgs84UtmProjection.LastZoneNorthEpsgCode => new Wgs84UtmProjection(epsgCode % 100, true),
-                case MapControl.WorldMercatorProjection.DefaultCrsId:
+            var code when code >= Wgs84UtmProjection.FirstZoneSouthEpsgCode && code <= Wgs84UtmProjection.LastZoneSouthEpsgCode => new Wgs84UtmProjection(epsgCode % 100, false),
-                    return new WorldMercatorProjection();
+            _ => CoordinateSystemWkts.TryGetValue(epsgCode, out string wkt) ? new GeoApiProjection(wkt) : base.GetProjection(epsgCode)
-
+        };
-                case MapControl.Wgs84AutoUtmProjection.DefaultCrsId:
-                    return new Wgs84AutoUtmProjection();
-
-                default:
-                    return base.GetProjection(crsId);
-            }
-        }
-
-        public override MapProjection GetProjection(int epsgCode)
-        {
-            switch (epsgCode)
-            {
-                case int c when c >= Ed50UtmProjection.FirstZoneEpsgCode && c <= Ed50UtmProjection.LastZoneEpsgCode:
-                    return new Ed50UtmProjection(epsgCode % 100);
-
-                case var c when c >= Etrs89UtmProjection.FirstZoneEpsgCode && c <= Etrs89UtmProjection.LastZoneEpsgCode:
-                    return new Etrs89UtmProjection(epsgCode % 100);
-
-                case var c when c >= Nad27UtmProjection.FirstZoneEpsgCode && c <= Nad27UtmProjection.LastZoneEpsgCode:
-                    return new Nad27UtmProjection(epsgCode % 100);
-
-                case var c when c >= Nad83UtmProjection.FirstZoneEpsgCode && c <= Nad83UtmProjection.LastZoneEpsgCode:
-                    return new Nad83UtmProjection(epsgCode % 100);
-
-                case var c when c >= Wgs84UtmProjection.FirstZoneNorthEpsgCode && c <= Wgs84UtmProjection.LastZoneNorthEpsgCode:
-                    return new Wgs84UtmProjection(epsgCode % 100, true);
-
-                case var c when c >= Wgs84UtmProjection.FirstZoneSouthEpsgCode && c <= Wgs84UtmProjection.LastZoneSouthEpsgCode:
-                    return new Wgs84UtmProjection(epsgCode % 100, false);
-
-                default:
-                    return CoordinateSystemWkts.TryGetValue(epsgCode, out string wkt)
-                        ? new GeoApiProjection(wkt)
-                        : base.GetProjection(epsgCode);
-            }
-        }
-
-        public Dictionary<int, string> CoordinateSystemWkts { get; } = new Dictionary<int, string>();
     }
 }

MapProjections/WPF/MapProjections.WPF.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
     <PropertyGroup>
         <TargetFrameworks>net9.0-windows;net462</TargetFrameworks>
-        <LangVersion Condition="'$(TargetFramework)'=='net462'">8.0</LangVersion>
+        <LangVersion Condition="'$(TargetFramework)'=='net462'">12.0</LangVersion>
         <UseWPF>true</UseWPF>
         <DefineConstants>WPF</DefineConstants>
         <RootNamespace>MapControl.Projections</RootNamespace>