Version 4.10.0: Added MapProjections library project.

MapProjections/Shared/GeoApiProjection.cs

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+// XAML Map Control - https://github.com/ClemensFischer/XAML-Map-Control
+// © 2018 Clemens Fischer
+// Licensed under the Microsoft Public License (Ms-PL)
+
+using System;
+using System.Text;
+#if !WINDOWS_UWP
+using System.Windows;
+#endif
+using GeoAPI.CoordinateSystems;
+using GeoAPI.CoordinateSystems.Transformations;
+using ProjNet.Converters.WellKnownText;
+using ProjNet.CoordinateSystems;
+using ProjNet.CoordinateSystems.Transformations;
+
+namespace MapControl.Projections
+{
+    /// <summary>
+    /// MapProjection based on ProjNET4GeoApi.
+    /// </summary>
+    public class GeoApiProjection : MapProjection
+    {
+        private ICoordinateTransformation coordinateTransform;
+        private IMathTransform mathTransform;
+        private IMathTransform inverseTransform;
+        private string wkt;
+
+        /// <summary>
+        /// Gets or sets the underlying ICoordinateTransformation instance.
+        /// Setting this property updates the CrsId property.
+        /// </summary>
+        public ICoordinateTransformation CoordinateTransform
+        {
+            get { return coordinateTransform; }
+            set
+            {
+                coordinateTransform = value;
+                mathTransform = coordinateTransform.MathTransform;
+                inverseTransform = mathTransform.Inverse();
+
+                if (coordinateTransform.TargetCS != null &&
+                    !string.IsNullOrEmpty(coordinateTransform.TargetCS.Authority) &&
+                    coordinateTransform.TargetCS.AuthorityCode > 0)
+                {
+                    CrsId = string.Format("{0}:{1}", coordinateTransform.TargetCS.Authority, coordinateTransform.TargetCS.AuthorityCode);
+                }
+            }
+        }
+
+        /// <summary>
+        /// Get or sets an OGC Well-known text representation of a projected coordinate system,
+        /// e.g. a PROJCS[...] string as used by https://epsg.io or http://spatialreference.org.
+        /// Setting this property updates the CoordinateTransform property.
+        /// </summary>
+        public string Wkt
+        {
+            get { return wkt; }
+            set
+            {
+                var sourceCs = GeographicCoordinateSystem.WGS84;
+                var targetCs = (ICoordinateSystem)CoordinateSystemWktReader.Parse(value, Encoding.UTF8);
+
+                CoordinateTransform = new CoordinateTransformationFactory().CreateFromCoordinateSystems(sourceCs, targetCs);
+                wkt = value;
+            }
+        }
+
+        public override Point LocationToPoint(Location location)
+        {
+            if (mathTransform == null)
+            {
+                throw new InvalidOperationException("The Wkt property is not set or not valid.");
+            }
+
+            var xy = mathTransform.Transform(new double[] { location.Longitude, location.Latitude });
+
+            return new Point(xy[0], xy[1]);
+        }
+
+        public override Location PointToLocation(Point point)
+        {
+            if (inverseTransform == null)
+            {
+                throw new InvalidOperationException("The Wkt property is not set or not valid.");
+            }
+
+            var lonLat = inverseTransform.Transform(new double[] { point.X, point.Y });
+
+            return new Location(lonLat[1], lonLat[0]);
+        }
+    }
+}

MapProjections/Shared/UtmProjection.cs

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+// XAML Map Control - https://github.com/ClemensFischer/XAML-Map-Control
+// © 2018 Clemens Fischer
+// Licensed under the Microsoft Public License (Ms-PL)
+
+using System;
+
+namespace MapControl.Projections
+{
+    public class UtmProjection : GeoApiProjection
+    {
+        private static readonly string wktFormat = "PROJCS[\"WGS 84 / UTM zone {0}\", GEOGCS[\"WGS 84\", DATUM[\"WGS_1984\", SPHEROID[\"WGS 84\", 6378137, 298.257223563, AUTHORITY[\"EPSG\", \"7030\"]], AUTHORITY[\"EPSG\", \"6326\"]], PRIMEM[\"Greenwich\", 0, AUTHORITY[\"EPSG\", \"8901\"]], UNIT[\"degree\", 0.01745329251994328, AUTHORITY[\"EPSG\", \"9122\"]], AUTHORITY[\"EPSG\", \"4326\"]], UNIT[\"metre\", 1, AUTHORITY[\"EPSG\", \"9001\"]], PROJECTION[\"Transverse_Mercator\"], PARAMETER[\"latitude_of_origin\", 0], PARAMETER[\"central_meridian\", {1}], PARAMETER[\"scale_factor\", 0.9996], PARAMETER[\"false_easting\", 500000], PARAMETER[\"false_northing\", {2}], AUTHORITY[\"EPSG\", \"{3}\"], AXIS[\"Easting\", EAST], AXIS[\"Northing\", NORTH]]";
+
+        private string zoneName;
+
+        public string ZoneName
+        {
+            get { return zoneName; }
+            set
+            {
+                var zoneNumber = 0;
+                var falseNorthing = 0;
+                var epsgCode = 0;
+
+                if (!string.IsNullOrEmpty(value))
+                {
+                    if (value.EndsWith("N"))
+                    {
+                        epsgCode = 32600;
+                    }
+                    else if (value.EndsWith("S"))
+                    {
+                        falseNorthing = 10000000;
+                        epsgCode = 32700;
+                    }
+
+                    if (epsgCode > 0)
+                    {
+                        int.TryParse(value.Substring(0, value.Length - 1), out zoneNumber);
+                    }
+                }
+
+                if (zoneNumber < 1 || zoneNumber > 60)
+                {
+                    throw new ArgumentException("Invalid UTM zone name.");
+                }
+
+                zoneName = value;
+                epsgCode += zoneNumber;
+
+                Wkt = string.Format(wktFormat, zoneName, 6 * zoneNumber - 183, falseNorthing, epsgCode);
+                TrueScale = 0.9996 * MetersPerDegree;
+            }
+        }
+    }
+}