Version 4: Upgrade to VS 2017

MapControl/Shared/AzimuthalProjection.cs

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+// XAML Map Control - https://github.com/ClemensFischer/XAML-Map-Control
+// © 2017 Clemens Fischer
+// Licensed under the Microsoft Public License (Ms-PL)
+
+using System;
+using System.Globalization;
+#if WINDOWS_UWP
+using Windows.Foundation;
+#else
+using System.Windows;
+#endif
+
+namespace MapControl
+{
+    /// <summary>
+    /// Base class for azimuthal map projections.
+    /// </summary>
+    public abstract class AzimuthalProjection : MapProjection
+    {
+        protected Location projectionCenter = new Location();
+
+        public AzimuthalProjection()
+        {
+            IsAzimuthal = true;
+            LongitudeScale = double.NaN;
+        }
+
+        public override double GetViewportScale(double zoomLevel)
+        {
+            return DegreesToViewportScale(zoomLevel) / MetersPerDegree;
+        }
+
+        public override Point GetMapScale(Location location)
+        {
+            return new Point(ViewportScale, ViewportScale);
+        }
+
+        public override Location TranslateLocation(Location location, Point translation)
+        {
+            var scaleY = ViewportScale * MetersPerDegree;
+            var scaleX = scaleY * Math.Cos(location.Latitude * Math.PI / 180d);
+
+            return new Location(
+                location.Latitude - translation.Y / scaleY,
+                location.Longitude + translation.X / scaleX);
+        }
+
+        public override Rect BoundingBoxToRect(BoundingBox boundingBox)
+        {
+            var cbbox = boundingBox as CenteredBoundingBox;
+
+            if (cbbox != null)
+            {
+                var center = LocationToPoint(cbbox.Center);
+
+                return new Rect(
+                     center.X - cbbox.Width / 2d, center.Y - cbbox.Height / 2d,
+                     cbbox.Width, cbbox.Height);
+            }
+
+            return base.BoundingBoxToRect(boundingBox);
+        }
+
+        public override BoundingBox RectToBoundingBox(Rect rect)
+        {
+            var center = PointToLocation(new Point(rect.X + rect.Width / 2d, rect.Y + rect.Height / 2d));
+
+            return new CenteredBoundingBox(center, rect.Width, rect.Height); // width and height in meters
+        }
+
+        public override void SetViewportTransform(Location projectionCenter, Location mapCenter, Point viewportCenter, double zoomLevel, double heading)
+        {
+            this.projectionCenter = projectionCenter;
+
+            base.SetViewportTransform(projectionCenter, mapCenter, viewportCenter, zoomLevel, heading);
+        }
+
+        public override string WmsQueryParameters(BoundingBox boundingBox, string version)
+        {
+            if (string.IsNullOrEmpty(CrsId))
+            {
+                return null;
+            }
+
+            var rect = BoundingBoxToRect(boundingBox);
+            var width = (int)Math.Round(ViewportScale * rect.Width);
+            var height = (int)Math.Round(ViewportScale * rect.Height);
+            var crs = version.StartsWith("1.1.") ? "SRS" : "CRS";
+
+            return string.Format(CultureInfo.InvariantCulture,
+                "{0}={1},1,{2},{3}&BBOX={4},{5},{6},{7}&WIDTH={8}&HEIGHT={9}",
+                crs, CrsId, projectionCenter.Longitude, projectionCenter.Latitude,
+                rect.X, rect.Y, (rect.X + rect.Width), (rect.Y + rect.Height), width, height);
+        }
+
+        /// <summary>
+        /// Calculates azimuth and distance in radians from location1 to location2.
+        /// The returned distance has to be multiplied with an appropriate earth radius.
+        /// </summary>
+        public static void GetAzimuthDistance(Location location1, Location location2, out double azimuth, out double distance)
+        {
+            var lat1 = location1.Latitude * Math.PI / 180d;
+            var lon1 = location1.Longitude * Math.PI / 180d;
+            var lat2 = location2.Latitude * Math.PI / 180d;
+            var lon2 = location2.Longitude * Math.PI / 180d;
+            var cosLat1 = Math.Cos(lat1);
+            var sinLat1 = Math.Sin(lat1);
+            var cosLat2 = Math.Cos(lat2);
+            var sinLat2 = Math.Sin(lat2);
+            var cosLon12 = Math.Cos(lon2 - lon1);
+            var sinLon12 = Math.Sin(lon2 - lon1);
+            var cosDistance = sinLat1 * sinLat2 + cosLat1 * cosLat2 * cosLon12;
+
+            azimuth = Math.Atan2(sinLon12, cosLat1 * sinLat2 / cosLat2 - sinLat1 * cosLon12);
+            distance = Math.Acos(Math.Max(Math.Min(cosDistance, 1d), -1d));
+        }
+
+        /// <summary>
+        /// Calculates the Location of the point given by azimuth and distance in radians from location.
+        /// </summary>
+        public static Location GetLocation(Location location, double azimuth, double distance)
+        {
+            var lat1 = location.Latitude * Math.PI / 180d;
+            var sinDistance = Math.Sin(distance);
+            var cosDistance = Math.Cos(distance);
+            var cosAzimuth = Math.Cos(azimuth);
+            var sinAzimuth = Math.Sin(azimuth);
+            var cosLat1 = Math.Cos(lat1);
+            var sinLat1 = Math.Sin(lat1);
+            var sinLat2 = sinLat1 * cosDistance + cosLat1 * sinDistance * cosAzimuth;
+            var lat2 = Math.Asin(Math.Max(Math.Min(sinLat2, 1d), -1d));
+            var dLon = Math.Atan2(sinDistance * sinAzimuth, cosLat1 * cosDistance - sinLat1 * sinDistance * cosAzimuth);
+
+            return new Location(180d / Math.PI * lat2, location.Longitude + 180d / Math.PI * dLon);
+        }
+    }
+}