Fix blank tiles on large windows and tilt (#522)

vtm/src/org/oscim/layers/tile/TileManager.java

@@ -217,8 +217,9 @@ public class TileManager {
         mTilesEnd = 0;
         mTilesCount = 0;
 
-        /* set up TileSet large enough to hold current tiles */
-        int num = Math.max(mMap.getWidth(), mMap.getHeight());
+        /* Set up TileSet large enough to hold current tiles.
+         * Use screen size as workaround for blank tiles in #520. */
+        int num = Math.max(mMap.getScreenWidth(), mMap.getScreenHeight());
         int size = Tile.SIZE >> 1;
         int numTiles = (num * num) / (size * size) * 4;
 

vtm/src/org/oscim/map/Map.java

@@ -2,8 +2,9 @@
  * Copyright 2013 Hannes Janetzek
  * Copyright 2016 Andrey Novikov
  * Copyright 2016 Stephan Leuschner
- * Copyright 2016-2017 devemux86
+ * Copyright 2016-2018 devemux86
  * Copyright 2016 Longri
+ * Copyright 2018 Gustl22
  *
  * This file is part of the OpenScienceMap project (http://www.opensciencemap.org).
  *
@@ -272,15 +273,25 @@ public abstract class Map implements TaskQueue {
     }
 
     /**
-     * Return screen width in pixel.
+     * Return view width in pixel.
      */
     public abstract int getWidth();
 
     /**
-     * Return screen height in pixel.
+     * Return view height in pixel.
      */
     public abstract int getHeight();
 
+    /**
+     * Return screen width in pixel.
+     */
+    public abstract int getScreenWidth();
+
+    /**
+     * Return screen height in pixel.
+     */
+    public abstract int getScreenHeight();
+
     /**
      * Request to clear all layers before rendering next frame
      */

vtm/src/org/oscim/map/Viewport.java

@@ -42,6 +42,8 @@ public class Viewport {
     public final static int MAX_ZOOM_LEVEL = 20;
     public final static int MIN_ZOOM_LEVEL = 2;
     public final static float MIN_TILT = 0;
+
+    /* Note: limited by numTiles in TileManager to ~80° */
     public final static float MAX_TILT = 65;
 
     protected double mMaxScale = (1 << MAX_ZOOM_LEVEL);