Updated TileSources

MapControl/Shared/UriTileSource.cs

@@ -0,0 +1,49 @@
+using System;
+
+namespace MapControl
+{
+    public class UriTileSource : TileSource
+    {
+        private readonly string uriFormat;
+
+        public UriTileSource(string uriTemplate)
+        {
+            uriFormat = uriTemplate
+                .Replace("{z}", "{0}")
+                .Replace("{x}", "{1}")
+                .Replace("{y}", "{2}")
+                .Replace("{s}", "{3}");
+
+            if (Subdomains == null && uriTemplate.Contains("{s}"))
+            {
+                Subdomains = ["a", "b", "c"]; // default OpenStreetMap subdomains
+            }
+        }
+
+        public string[] Subdomains { get; set; }
+
+        public override Uri GetUri(int zoomLevel, int column, int row)
+        {
+            Uri uri = null;
+
+            if (uriFormat != null)
+            {
+                var uriString = Subdomains?.Length > 0
+                    ? string.Format(uriFormat, zoomLevel, column, row, Subdomains[(column + row) % Subdomains.Length])
+                    : string.Format(uriFormat, zoomLevel, column, row);
+
+                uri = new Uri(uriString, UriKind.RelativeOrAbsolute);
+            }
+
+            return uri;
+        }
+    }
+
+    public class TmsTileSource(string uriTemplate) : UriTileSource(uriTemplate)
+    {
+        public override Uri GetUri(int zoomLevel, int column, int row)
+        {
+            return base.GetUri(zoomLevel, column, (1 << zoomLevel) - 1 - row);
+        }
+    }
+}