Location texture renderer (#548)

- add LocationTextureLayer with accuracy
- add Android sample for LocationTextureLayer

vtm-android-example/src/org/oscim/android/test/LocationTextureActivity.java

@@ -0,0 +1,118 @@
+/*
+ * Copyright 2016-2018 devemux86
+ * Copyright 2018 Longri
+ *
+ * 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.android.test;
+
+import android.content.Context;
+import android.location.Location;
+import android.location.LocationListener;
+import android.location.LocationManager;
+import android.os.Bundle;
+
+import org.oscim.backend.CanvasAdapter;
+import org.oscim.backend.canvas.Bitmap;
+import org.oscim.backend.canvas.Color;
+import org.oscim.core.MapPosition;
+import org.oscim.layers.LocationTextureLayer;
+import org.oscim.renderer.atlas.TextureAtlas;
+import org.oscim.renderer.atlas.TextureRegion;
+import org.oscim.renderer.bucket.TextureItem;
+
+import java.io.IOException;
+import java.io.InputStream;
+
+public class LocationTextureActivity extends BitmapTileActivity implements LocationListener {
+    private LocationTextureLayer locationLayer;
+    private LocationManager locationManager;
+    private final MapPosition mapPosition = new MapPosition();
+
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+
+        //initial Android locationManager
+        locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
+
+        //load a Bitmap/Svg from resources. (North/0° are on top
+        InputStream is = getResources().openRawResource(R.raw.arrow);
+        Bitmap bmp = null;
+        try {
+            bmp = CanvasAdapter.decodeSvgBitmap(is, 200, 200, 100);
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+        //create TextureRegion from Bitmap
+        TextureRegion textureRegion = new TextureRegion(new TextureItem(bmp), new TextureAtlas.Rect(0, 0, bmp.getWidth(), bmp.getHeight()));
+
+        //create LocationTexturLayer with created/loaded TextureRegion
+        locationLayer = new LocationTextureLayer(mMap, textureRegion);
+
+        // you can set the Color of Accuracy circle (Color.BLUE is default)
+        locationLayer.setAccuracyColor(Color.get(50, 50, 255));
+
+        // you can set the Color of Indicator circle (Color.RED is default)
+        locationLayer.setIndicatorColor(Color.MAGENTA);
+
+        locationLayer.setEnabled(false);
+        mMap.layers().add(locationLayer);
+    }
+
+    @Override
+    protected void onResume() {
+        super.onResume();
+        enableAvailableProviders();
+    }
+
+    @Override
+    protected void onPause() {
+        super.onPause();
+
+        locationManager.removeUpdates(this);
+    }
+
+    @Override
+    public void onLocationChanged(Location location) {
+        locationLayer.setEnabled(true);
+        locationLayer.setPosition(location.getLatitude(), location.getLongitude(), location.getBearing(), location.getAccuracy());
+
+        // Follow location
+        mMap.getMapPosition(mapPosition);
+        mapPosition.setPosition(location.getLatitude(), location.getLongitude());
+        mMap.setMapPosition(mapPosition);
+    }
+
+    @Override
+    public void onProviderDisabled(String provider) {
+    }
+
+    @Override
+    public void onProviderEnabled(String provider) {
+    }
+
+    @Override
+    public void onStatusChanged(String provider, int status, Bundle extras) {
+    }
+
+    private void enableAvailableProviders() {
+        locationManager.removeUpdates(this);
+
+        for (String provider : locationManager.getProviders(true)) {
+            if (LocationManager.GPS_PROVIDER.equals(provider)
+                    || LocationManager.NETWORK_PROVIDER.equals(provider)) {
+                locationManager.requestLocationUpdates(provider, 0, 0, this);
+            }
+        }
+    }
+}

vtm-android-example/src/org/oscim/android/test/Samples.java

@@ -2,7 +2,7 @@
  * Copyright 2010, 2011, 2012, 2013 mapsforge.org
  * Copyright 2013 Hannes Janetzek
  * Copyright 2016-2018 devemux86
- * Copyright 2017 Longri
+ * Copyright 2017-2018 Longri
  * Copyright 2017 nebular
  *
  * This file is part of the OpenScienceMap project (http://www.opensciencemap.org).
@@ -98,6 +98,7 @@ public class Samples extends Activity {
             }
         }));
         linearLayout.addView(createButton(LocationActivity.class));
+        linearLayout.addView(createButton(LocationTextureActivity.class));
         linearLayout.addView(createButton(PoiSearchActivity.class));
 
         linearLayout.addView(createLabel("Vector Features"));