Add location layer and Samples example #171

vtm/src/org/oscim/layers/LocationLayer.java

@@ -0,0 +1,50 @@
+/*
+ * Copyright 2013 Ahmad Saleem
+ * Copyright 2013 Hannes Janetzek
+ * Copyright 2016 devemux86
+ *
+ * This program is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU Lesser General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+ * PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License along with
+ * this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+package org.oscim.layers;
+
+import org.oscim.core.MercatorProjection;
+import org.oscim.map.Map;
+import org.oscim.renderer.LocationRenderer;
+
+public class LocationLayer extends Layer {
+    public final LocationRenderer locationRenderer;
+
+    public LocationLayer(Map map) {
+        super(map);
+
+        mRenderer = locationRenderer = new LocationRenderer(mMap, this);
+    }
+
+    @Override
+    public void setEnabled(boolean enabled) {
+        if (enabled == isEnabled())
+            return;
+
+        super.setEnabled(enabled);
+
+        if (!enabled)
+            locationRenderer.animate(false);
+    }
+
+    public void setPosition(double latitude, double longitude, double accuracy) {
+        double x = MercatorProjection.longitudeToX(longitude);
+        double y = MercatorProjection.latitudeToY(latitude);
+        double radius = accuracy / MercatorProjection.groundResolution(latitude, 1);
+        locationRenderer.setLocation(x, y, radius);
+        locationRenderer.animate(true);
+    }
+}