Add Google, OpenStreetMap, OpenTogographicMap and WikiMap layers supp…

…ort.

worldwind/src/main/java/gov/nasa/worldwind/layer/mercator/google/GoogleLayer.java

@@ -0,0 +1,39 @@
+package gov.nasa.worldwind.layer.mercator.google;
+
+import gov.nasa.worldwind.layer.mercator.MercatorTiledImageLayer;
+
+public class GoogleLayer extends MercatorTiledImageLayer {
+
+    public GoogleLayer(Type type) {
+        super(type.layerName, 22, 0, 256, type.overlay);
+        this.lyrs = type.lyrs;
+    }
+
+    private final String lyrs;
+
+    public enum Type {
+        ROADMAP("Google road map", "m", false),
+        ROADMAP2("Google road map 2", "r", false),
+        TERRAIN("Google map w/ terrain", "p", false),
+        TERRAIN_ONLY("Google terrain only", "t", false),
+        HYBRID("Google hybrid", "y", false),
+        SATELLITE("Google satellite", "s", false),
+        ROADS("Google roads", "h", true),
+        TRAFFIC("Google traffic", "h,traffic&style=15", true);
+
+        private final String layerName;
+        private final String lyrs;
+        private final boolean overlay;
+
+        Type(String layerName, String lyrs, boolean overlay) {
+            this.layerName = layerName;
+            this.lyrs = lyrs;
+            this.overlay = overlay;
+        }
+    }
+
+    @Override
+    public String getImageSourceUrl(int x, int y, int z) {
+        return "https://mt.google.com/vt/lyrs="+lyrs+"&x="+x+"&y="+y+"&z="+z+"&hl=ru";
+    }
+}

worldwind/src/main/java/gov/nasa/worldwind/layer/mercator/osm/OSMLayer.java

@@ -0,0 +1,23 @@
+package gov.nasa.worldwind.layer.mercator.osm;
+
+import java.util.Random;
+
+import gov.nasa.worldwind.layer.mercator.MercatorTiledImageLayer;
+
+public class OSMLayer extends MercatorTiledImageLayer {
+
+    public static final String NAME = "OpenStreetMap";
+
+    private final Random random = new Random();
+
+    public OSMLayer() {
+        super(NAME, 20, 3, 256, false);
+    }
+
+    @Override
+    protected String getImageSourceUrl(int x, int y, int z) {
+        char abc = "abc".charAt(random.nextInt(2));
+        return "https://"+abc+".tile.openstreetmap.org/"+z+"/"+x+"/"+y+".png";
+    }
+
+}

worldwind/src/main/java/gov/nasa/worldwind/layer/mercator/osm/OTMLayer.java

@@ -0,0 +1,23 @@
+package gov.nasa.worldwind.layer.mercator.osm;
+
+import java.util.Random;
+
+import gov.nasa.worldwind.layer.mercator.MercatorTiledImageLayer;
+
+public class OTMLayer extends MercatorTiledImageLayer {
+
+    public static final String NAME = "OpenTopoMap";
+
+    private final Random random = new Random();
+
+    public OTMLayer() {
+        super(NAME, 18, 3, 256, false);
+    }
+
+    @Override
+    protected String getImageSourceUrl(int x, int y, int z) {
+        char abc = "abc".charAt(random.nextInt(2));
+        return "https://"+abc+".tile.opentopomap.org/"+z+"/"+x+"/"+y+".png";
+    }
+
+}

worldwind/src/main/java/gov/nasa/worldwind/layer/mercator/wiki/WikiLayer.java

@@ -0,0 +1,24 @@
+package gov.nasa.worldwind.layer.mercator.wiki;
+
+import gov.nasa.worldwind.layer.mercator.MercatorTiledImageLayer;
+
+public class WikiLayer extends MercatorTiledImageLayer {
+
+    public enum Type { MAP, HYBRID }
+
+    public static final String NAME = "Wiki";
+
+    private final Type type;
+
+    public WikiLayer(Type type) {
+        super(NAME + type.name().toLowerCase(), 23, 3, 256, Type.HYBRID == type);
+        this.type = type;
+    }
+
+    @Override
+    protected String getImageSourceUrl(int x, int y, int z) {
+        int i = x % 4 + y % 4 * 4;
+        return "http://i"+i+".wikimapia.org/?lng=1&x="+x+"&y="+y+"&zoom="+z+"&type="+type.name().toLowerCase();
+    }
+
+}