Update latitute and longitude Axis format

Author: BobLd

OxyPlot.Core.Cartography/Axes/LatitudeWebMercatorAxis.cs

@@ -30,7 +30,7 @@ public LatitudeWebMercatorAxis()
             AbsoluteMinimum = -_maxValue;
             AbsoluteMaximum = _maxValue;
             Key = "Latitude";
-            StringFormat = "00.0###°";
+            StringFormat = "00.0###°N;00.0###°S";
 
             // Hack as 'UpdateActualMaxMin' method is internal
             _updateActualMaxMinMethod = typeof(Axis).GetMethod("UpdateActualMaxMin",

OxyPlot.Core.Cartography/Axes/LongitudeAxis.cs

@@ -15,7 +15,7 @@ public LongitudeAxis() : base()
             this.AbsoluteMinimum = -_maxDefaultValue;
             this.AbsoluteMaximum = _maxDefaultValue;
             Key = "Longitude";
-            StringFormat = "00.0###°";
+            StringFormat = "00.0###°E;00.0###°W";
         }
 
         /// <summary>

OxyPlot.Core.Cartography/Utilities/CartographyHelper.cs

@@ -95,11 +95,11 @@ public static void TileToLatLon(double x, double y, int zoom, out double latitud
         public static string DecimalDegreesToDegreesMinutesSeconds(double decimalDegrees, bool isLatitude, int secondsDecimal)
         {
             // see https://en.wikipedia.org/wiki/ISO_6709#Representation_at_the_human_interface_(Annex_D)
-            var card = isLatitude ? (decimalDegrees > 0 ? "N" : "S") : (decimalDegrees > 0 ? "E" : "W");
-            var d = Math.Truncate(decimalDegrees);
-            var delta = Math.Abs(decimalDegrees - d);
-            var m = Math.Truncate(60 * delta);
-            var s = Math.Round(3600.0 * delta - 60.0 * m, secondsDecimal);
+            char card = isLatitude ? (decimalDegrees > 0 ? 'N' : 'S') : (decimalDegrees > 0 ? 'E' : 'W');
+            double d = Math.Truncate(decimalDegrees);
+            double delta = Math.Abs(decimalDegrees - d);
+            double m = Math.Truncate(60 * delta);
+            double s = Math.Round(3600.0 * delta - 60.0 * m, secondsDecimal);
             return $"{Math.Abs(d):00}\u00b0{m:00}\u2032{s:00}\u2033{card}";
         }