-use absolute x/y position and scale in MapPosition

- scale calculations look much nicer now, better always
   use 'double' unless you are sure about precision required
- finally got rid of zoomLevel relative coordinates
- cleanup MapPosition and MercatorProjection API functions

src/org/oscim/core/MapPosition.java

@@ -15,78 +15,73 @@
  */
 package org.oscim.core;
 
+import org.oscim.utils.FastMath;
+
 /** A MapPosition Container. */
 public class MapPosition {
+	public final static int MAX_ZOOMLEVEL = 20;
+	public final static int MIN_ZOOMLEVEL = 2;
 
-	public double lon;
+	/** projected position x 0..1 */
-	public double lat;
+	public double x;
+	/** projected position y 0..1 */
+	public double y;
+	/** absolute scale */
+	public double scale;
 
-	public double absX;
+	/** rotation angle */
-	public double absY;
-	public double absScale;
-
-	public float scale;
 	public float angle;
+	/** perspective tile */
 	public float tilt;
 
-	// map center in tile coordinates of current zoom-level
+	// to be removed
-	public double x;
+	//  FastMath.log2((int) scale)
-	public double y;
 	public int zoomLevel;
 
 	public MapPosition() {
-		this.zoomLevel = (byte) 1;
 		this.scale = 1;
-		this.lat = 0;
+		this.x = 0.5;
-		this.lon = 0;
+		this.y = 0.5;
+		this.zoomLevel = 1;
 		this.angle = 0;
-		this.x = MercatorProjection.longitudeToPixelX(this.lon, zoomLevel);
-		this.y = MercatorProjection.latitudeToPixelY(this.lat, zoomLevel);
 	}
 
-	/**
+	public void setZoomLevel(int zoomLevel) {
-	 * @param geoPoint
-	 *            the map position.
-	 * @param zoomLevel
-	 *            the zoom level.
-	 * @param scale
-	 *            ...
-	 */
-	public MapPosition(GeoPoint geoPoint, byte zoomLevel, float scale) {
 		this.zoomLevel = zoomLevel;
-		this.scale = scale;
+		this.scale = 1 << zoomLevel;
-		this.lat = geoPoint.getLatitude();
-		this.lon = geoPoint.getLongitude();
-		this.angle = 0;
-		this.x = MercatorProjection.longitudeToPixelX(this.lon, zoomLevel);
-		this.y = MercatorProjection.latitudeToPixelY(this.lat, zoomLevel);
 	}
 
-	public MapPosition(double latitude, double longitude, int zoomLevel, float scale,
+	public void setScale(double scale) {
-			float angle) {
+		this.zoomLevel = FastMath.log2((int) scale);
-		this.zoomLevel = zoomLevel;
 		this.scale = scale;
-		this.lat = latitude;
+	}
-		this.lon = longitude;
+
-		this.angle = angle;
+	public void setPosition(GeoPoint geoPoint){
-		this.x = MercatorProjection.longitudeToPixelX(longitude, zoomLevel);
+		setPosition(geoPoint.getLatitude(), geoPoint.getLongitude());
-		this.y = MercatorProjection.latitudeToPixelY(latitude, zoomLevel);
+	}
+
+	public void setPosition(double latitude, double longitude) {
+		latitude = MercatorProjection.limitLatitude(latitude);
+		longitude = MercatorProjection.limitLongitude(longitude);
+		this.x = MercatorProjection.longitudeToX(longitude);
+		this.y = MercatorProjection.latitudeToY(latitude);
 	}
 
 	public void copy(MapPosition other) {
 		this.zoomLevel = other.zoomLevel;
-		this.scale = other.scale;
-		this.lat = other.lat;
-		this.lon = other.lon;
 		this.angle = other.angle;
+		this.scale = other.scale;
 		this.x = other.x;
 		this.y = other.y;
 	}
 
-	public void setFromLatLon(double latitude, double longitude, int zoomLevel){
+	public double getZoomScale() {
-		this.zoomLevel = zoomLevel;
+		return scale / (1 << zoomLevel);
-		this.x = MercatorProjection.longitudeToPixelX(longitude, zoomLevel);
+	}
-		this.y = MercatorProjection.latitudeToPixelY(latitude, zoomLevel);
+
+	public GeoPoint getGeoPoint() {
+		return new GeoPoint(MercatorProjection.toLatitude(y),
+				MercatorProjection.toLongitude(x));
 	}
 
 	@Override
@@ -94,11 +89,11 @@ public class MapPosition {
 		StringBuilder builder = new StringBuilder();
 		builder.append("MapPosition [");
 		builder.append("lat=");
-		builder.append(this.lat);
+		builder.append(MercatorProjection.toLatitude(y));
 		builder.append(", lon=");
-		builder.append(this.lon);
+		builder.append(MercatorProjection.toLongitude(x));
 		builder.append(", zoomLevel=");
-		builder.append(this.zoomLevel);
+		builder.append(zoomLevel);
 		builder.append("]");
 		return builder.toString();
 	}

src/org/oscim/core/MercatorProjection.java

@@ -15,7 +15,6 @@
  */
 package org.oscim.core;
 
-
 /**
  * An implementation of the spherical Mercator projection.
  */
@@ -61,28 +60,6 @@ public final class MercatorProjection {
 				/ ((long) Tile.TILE_SIZE << zoomLevel);
 	}
 
-	/**
-	 * Converts a latitude coordinate (in degrees) to a pixel Y coordinate at a
-	 * certain zoom level.
-	 *
-	 * @param latitude
-	 *            the latitude coordinate that should be converted.
-	 * @param zoomLevel
-	 *            the zoom level at which the coordinate should be converted.
-	 * @return the pixel Y coordinate of the latitude value.
-	 */
-	public static double latitudeToPixelY(double latitude, int zoomLevel) {
-		double sinLatitude = Math.sin(latitude * (Math.PI / 180));
-		return (0.5 - Math.log((1 + sinLatitude) / (1 - sinLatitude)) / (4 * Math.PI))
-				* ((long) Tile.TILE_SIZE << zoomLevel);
-	}
-
-	public static double latitudeToPixelY(MapPosition mapPosition) {
-		double sinLatitude = Math.sin(mapPosition.lat * (Math.PI / 180));
-		return (0.5 - Math.log((1 + sinLatitude) / (1 - sinLatitude)) / (4 * Math.PI))
-				* ((long) Tile.TILE_SIZE << mapPosition.zoomLevel);
-	}
-
 	/**
 	 * Projects a longitude coordinate (in degrees) to the range [0.0,1.0]
 	 *
@@ -95,18 +72,23 @@ public final class MercatorProjection {
 		return 0.5 - Math.log((1 + sinLatitude) / (1 - sinLatitude)) / (4 * Math.PI);
 	}
 
+	public static double toLatitude(double y) {
+		return 90 - 360 * Math.atan(Math.exp((y - 0.5) * (2 * Math.PI))) / Math.PI;
+	}
+
 	/**
-	 * Converts a latitude coordinate (in degrees) to a tile Y number at a
+	 * Projects a longitude coordinate (in degrees) to the range [0.0,1.0]
-	 * certain zoom level.
 	 *
-	 * @param latitude
+	 * @param longitude
-	 *            the latitude coordinate that should be converted.
+	 *            the longitude coordinate that should be converted.
-	 * @param zoomLevel
+	 * @return the position .
-	 *            the zoom level at which the coordinate should be converted.
-	 * @return the tile Y number of the latitude value.
 	 */
-	public static long latitudeToTileY(double latitude, int zoomLevel) {
+	public static double longitudeToX(double longitude) {
-		return pixelYToTileY(latitudeToPixelY(latitude, zoomLevel), zoomLevel);
+		return (longitude + 180) / 360;
+	}
+
+	public static double toLongitude(double x) {
+		return 360 * (x - 0.5);
 	}
 
 	/**
@@ -135,51 +117,6 @@ public final class MercatorProjection {
 			return Math.max(Math.min(longitude - 360, LONGITUDE_MAX), LONGITUDE_MIN);
 
 		return longitude;
-
-	}
-
-	/**
-	 * Converts a longitude coordinate (in degrees) to a pixel X coordinate at a
-	 * certain zoom level.
-	 *
-	 * @param longitude
-	 *            the longitude coordinate that should be converted.
-	 * @param zoomLevel
-	 *            the zoom level at which the coordinate should be converted.
-	 * @return the pixel X coordinate of the longitude value.
-	 */
-	public static double longitudeToPixelX(double longitude,int zoomLevel) {
-		return (longitude + 180) / 360 * ((long) Tile.TILE_SIZE << zoomLevel);
-	}
-
-	public static double longitudeToPixelX(MapPosition mapPosition) {
-		return (mapPosition.lon + 180) / 360
-				* ((long) Tile.TILE_SIZE << mapPosition.zoomLevel);
-	}
-
-	/**
-	 * Projects a longitude coordinate (in degrees) to the range [0.0,1.0]
-	 *
-	 * @param longitude
-	 *            the longitude coordinate that should be converted.
-	 * @return the position .
-	 */
-	public static double longitudeToX(double longitude) {
-		return (longitude + 180) / 360;
-	}
-
-	/**
-	 * Converts a longitude coordinate (in degrees) to the tile X number at a
-	 * certain zoom level.
-	 *
-	 * @param longitude
-	 *            the longitude coordinate that should be converted.
-	 * @param zoomLevel
-	 *            the zoom level at which the coordinate should be converted.
-	 * @return the tile X number of the longitude value.
-	 */
-	public static long longitudeToTileX(double longitude, int zoomLevel) {
-		return pixelXToTileX(longitudeToPixelX(longitude, zoomLevel), zoomLevel);
 	}
 
 	/**
@@ -196,25 +133,18 @@ public final class MercatorProjection {
 		return 360 * ((pixelX / ((long) Tile.TILE_SIZE << zoomLevel)) - 0.5);
 	}
 
-	public static double toLongitude(double pixelX) {
-		return 360 * (pixelX - 0.5);
-	}
-
-	public static double toLongitude(double pixelX, double scale) {
-		return 360 * ((pixelX / scale) - 0.5);
-	}
 	/**
-	 * Converts a pixel X coordinate to the tile X number.
+	 * Converts a longitude coordinate (in degrees) to a pixel X coordinate at a
+	 * certain zoom level.
 	 *
-	 * @param pixelX
+	 * @param longitude
-	 *            the pixel X coordinate that should be converted.
+	 *            the longitude coordinate that should be converted.
 	 * @param zoomLevel
 	 *            the zoom level at which the coordinate should be converted.
-	 * @return the tile X number.
+	 * @return the pixel X coordinate of the longitude value.
 	 */
-	public static int pixelXToTileX(double pixelX, int zoomLevel) {
+	public static double longitudeToPixelX(double longitude, int zoomLevel) {
-		return (int) Math.min(Math.max(pixelX / Tile.TILE_SIZE, 0),
+		return (longitude + 180) / 360 * ((long) Tile.TILE_SIZE << zoomLevel);
-				Math.pow(2, zoomLevel) - 1);
 	}
 
 	/**
@@ -232,69 +162,22 @@ public final class MercatorProjection {
 		return 90 - 360 * Math.atan(Math.exp(-y * (2 * Math.PI))) / Math.PI;
 	}
 
-	public static double toLatitude(double pixelY) {
-		double y = 0.5 - pixelY;
-		return 90 - 360 * Math.atan(Math.exp(-y * (2 * Math.PI))) / Math.PI;
-	}
-
-	public static double toLatitude(double pixelY, double scale) {
-		double y = 0.5 - pixelY / scale;
-		return 90 - 360 * Math.atan(Math.exp(-y * (2 * Math.PI))) / Math.PI;
-	}
 	/**
-	 * Converts a pixel Y coordinate to the tile Y number.
+	 * Converts a latitude coordinate (in degrees) to a pixel Y coordinate at a
+	 * certain zoom level.
 	 *
-	 * @param pixelY
+	 * @param latitude
-	 *            the pixel Y coordinate that should be converted.
+	 *            the latitude coordinate that should be converted.
 	 * @param zoomLevel
 	 *            the zoom level at which the coordinate should be converted.
-	 * @return the tile Y number.
+	 * @return the pixel Y coordinate of the latitude value.
 	 */
-	public static int pixelYToTileY(double pixelY, int zoomLevel) {
+	public static double latitudeToPixelY(double latitude, int zoomLevel) {
-		return (int) Math.min(Math.max(pixelY / Tile.TILE_SIZE, 0),
+		double sinLatitude = Math.sin(latitude * (Math.PI / 180));
-				Math.pow(2, zoomLevel) - 1);
+		return (0.5 - Math.log((1 + sinLatitude) / (1 - sinLatitude)) / (4 * Math.PI))
-	}
+				* ((long) Tile.TILE_SIZE << zoomLevel);
-
-	/**
-	 * Converts a tile X number at a certain zoom level to a longitude
-	 * coordinate.
-	 *
-	 * @param tileX
-	 *            the tile X number that should be converted.
-	 * @param zoomLevel
-	 *            the zoom level at which the number should be converted.
-	 * @return the longitude value of the tile X number.
-	 */
-	public static double tileXToLongitude(long tileX, int zoomLevel) {
-		return pixelXToLongitude(tileX * Tile.TILE_SIZE, zoomLevel);
-	}
-
-	/**
-	 * Converts a tile Y number at a certain zoom level to a latitude
-	 * coordinate.
-	 *
-	 * @param tileY
-	 *            the tile Y number that should be converted.
-	 * @param zoomLevel
-	 *            the zoom level at which the number should be converted.
-	 * @return the latitude value of the tile Y number.
-	 */
-	public static double tileYToLatitude(long tileY, int zoomLevel) {
-		return pixelYToLatitude(tileY * Tile.TILE_SIZE, zoomLevel);
 	}
 
 	private MercatorProjection() {
-		throw new IllegalStateException();
 	}
-
-//	public static Point projectPoint(GeoPoint geopoint, int z, Point reuse) {
-//		Point out = reuse == null ? new Point() : reuse;
-//
-//		out.x = (int) MercatorProjection.longitudeToPixelX(geopoint.getLongitude(), z);
-//		out.y = (int) MercatorProjection.latitudeToPixelY(geopoint.getLatitude(), z);
-//
-//		return out;
-//	}
-
-
 }

src/org/oscim/core/Tile.java

@@ -41,15 +41,6 @@ public class Tile {
 	 */
 	public final byte zoomLevel;
 
-	/**
-	 * the pixel X coordinate of the upper left corner of this tile.
-	 */
-	public final long pixelX;
-	/**
-	 * the pixel Y coordinate of the upper left corner of this tile.
-	 */
-	public final long pixelY;
-
 	/**
 	 * @param tileX
 	 *            the X number of the tile.
@@ -61,8 +52,6 @@ public class Tile {
 	public Tile(int tileX, int tileY, byte zoomLevel) {
 		this.tileX = tileX;
 		this.tileY = tileY;
-		this.pixelX = this.tileX * TILE_SIZE;
-		this.pixelY = this.tileY * TILE_SIZE;
 		this.zoomLevel = zoomLevel;
 	}
 

src/org/oscim/database/mapfile/MapDatabase.java

@@ -19,7 +19,6 @@ import java.io.IOException;
 import java.io.RandomAccessFile;
 
 import org.oscim.core.GeometryBuffer;
-import org.oscim.core.MercatorProjection;
 import org.oscim.core.Tag;
 import org.oscim.core.Tile;
 import org.oscim.database.IMapDatabase;
@@ -443,6 +442,8 @@ public class MapDatabase implements IMapDatabase {
 
 	}
 
+
+
 	private void processBlocks(IMapDatabaseCallback mapDatabaseCallback,
 			QueryParameters queryParameters,
 			SubFileParameter subFileParameter) throws IOException {
@@ -527,10 +528,10 @@ public class MapDatabase implements IMapDatabase {
 				}
 
 				// calculate the top-left coordinates of the underlying tile
-				double tileLatitudeDeg = MercatorProjection.tileYToLatitude(
+				double tileLatitudeDeg = Projection.tileYToLatitude(
 						subFileParameter.boundaryTileTop + row,
 						subFileParameter.baseZoomLevel);
-				double tileLongitudeDeg = MercatorProjection.tileXToLongitude(
+				double tileLongitudeDeg = Projection.tileXToLongitude(
 						subFileParameter.boundaryTileLeft
 								+ column, subFileParameter.baseZoomLevel);
 				mTileLatitude = (int) (tileLatitudeDeg * 1000000);
@@ -590,9 +591,8 @@ public class MapDatabase implements IMapDatabase {
 		Tag[] tags = null;
 		Tag[] curTags;
 
-
+		long x = mTile.tileX * Tile.TILE_SIZE;
-		long x = mTile.pixelX;
+		long y = mTile.tileY * Tile.TILE_SIZE + Tile.TILE_SIZE;
-		long y = mTile.pixelY + Tile.TILE_SIZE;
 		long z = Tile.TILE_SIZE << mTile.zoomLevel;
 
 		long dx = (x - (z >> 1));
@@ -917,7 +917,7 @@ public class MapDatabase implements IMapDatabase {
 			int add = (hasName ? 1 : 0) + (hasHouseNr ? 1 : 0) + (hasRef ? 1 : 0);
 			int addTag = tags.length;
 
-			if (add > 0){
+			if (add > 0) {
 				curTags = new Tag[tags.length + add];
 				System.arraycopy(tags, 0, curTags, 0, tags.length);
 			}
@@ -1055,8 +1055,8 @@ public class MapDatabase implements IMapDatabase {
 
 	private boolean projectToTile(float[] coords, short[] indices) {
 
-		long x = mTile.pixelX;
+		long x = mTile.tileX * Tile.TILE_SIZE;
-		long y = mTile.pixelY + Tile.TILE_SIZE;
+		long y = mTile.tileY * Tile.TILE_SIZE + Tile.TILE_SIZE;
 		long z = Tile.TILE_SIZE << mTile.zoomLevel;
 
 		double divx, divy = 0;

src/org/oscim/database/mapfile/Projection.java

@@ -0,0 +1,108 @@
+/*
+ * Copyright 2010, 2011, 2012 mapsforge.org
+ *
+ * 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.database.mapfile;
+
+import org.oscim.core.MercatorProjection;
+import org.oscim.core.Tile;
+
+public class Projection {
+
+
+	/**
+	 * Converts a tile X number at a certain zoom level to a longitude
+	 * coordinate.
+	 *
+	 * @param tileX
+	 *            the tile X number that should be converted.
+	 * @param zoomLevel
+	 *            the zoom level at which the number should be converted.
+	 * @return the longitude value of the tile X number.
+	 */
+	public static double tileXToLongitude(long tileX, int zoomLevel) {
+		return MercatorProjection.pixelXToLongitude(tileX * Tile.TILE_SIZE, zoomLevel);
+	}
+
+	/**
+	 * Converts a tile Y number at a certain zoom level to a latitude
+	 * coordinate.
+	 *
+	 * @param tileY
+	 *            the tile Y number that should be converted.
+	 * @param zoomLevel
+	 *            the zoom level at which the number should be converted.
+	 * @return the latitude value of the tile Y number.
+	 */
+	public static double tileYToLatitude(long tileY, int zoomLevel) {
+		return MercatorProjection.pixelYToLatitude(tileY * Tile.TILE_SIZE, zoomLevel);
+	}
+
+	/**
+	 * Converts a latitude coordinate (in degrees) to a tile Y number at a
+	 * certain zoom level.
+	 *
+	 * @param latitude
+	 *            the latitude coordinate that should be converted.
+	 * @param zoomLevel
+	 *            the zoom level at which the coordinate should be converted.
+	 * @return the tile Y number of the latitude value.
+	 */
+	public static long latitudeToTileY(double latitude, int zoomLevel) {
+		return pixelYToTileY(MercatorProjection.latitudeToPixelY(latitude, zoomLevel), zoomLevel);
+	}
+
+	/**
+	 * Converts a longitude coordinate (in degrees) to the tile X number at a
+	 * certain zoom level.
+	 *
+	 * @param longitude
+	 *            the longitude coordinate that should be converted.
+	 * @param zoomLevel
+	 *            the zoom level at which the coordinate should be converted.
+	 * @return the tile X number of the longitude value.
+	 */
+	public static long longitudeToTileX(double longitude, int zoomLevel) {
+		return pixelXToTileX(MercatorProjection.longitudeToPixelX(longitude, zoomLevel), zoomLevel);
+	}
+
+	/**
+	 * Converts a pixel X coordinate to the tile X number.
+	 *
+	 * @param pixelX
+	 *            the pixel X coordinate that should be converted.
+	 * @param zoomLevel
+	 *            the zoom level at which the coordinate should be converted.
+	 * @return the tile X number.
+	 */
+	public static int pixelXToTileX(double pixelX, int zoomLevel) {
+		return (int) Math.min(Math.max(pixelX / Tile.TILE_SIZE, 0),
+				Math.pow(2, zoomLevel) - 1);
+	}
+	/**
+	 * Converts a pixel Y coordinate to the tile Y number.
+	 *
+	 * @param pixelY
+	 *            the pixel Y coordinate that should be converted.
+	 * @param zoomLevel
+	 *            the zoom level at which the coordinate should be converted.
+	 * @return the tile Y number.
+	 */
+	public static int pixelYToTileY(double pixelY, int zoomLevel) {
+		return (int) Math.min(Math.max(pixelY / Tile.TILE_SIZE, 0),
+				Math.pow(2, zoomLevel) - 1);
+	}
+	private Projection(){
+
+	}
+}

src/org/oscim/database/mapfile/header/SubFileParameter.java

@@ -14,7 +14,7 @@
  */
 package org.oscim.database.mapfile.header;
 
-import org.oscim.core.MercatorProjection;
+import org.oscim.database.mapfile.Projection;
 
 /**
  * Holds all parameters of a sub-file.
@@ -110,6 +110,7 @@ public class SubFileParameter {
 	 */
 	private final int hashCodeValue;
 
+
 	SubFileParameter(SubFileParameterBuilder subFileParameterBuilder) {
 		this.startAddress = subFileParameterBuilder.startAddress;
 		this.indexStartAddress = subFileParameterBuilder.indexStartAddress;
@@ -120,16 +121,16 @@ public class SubFileParameter {
 		this.hashCodeValue = calculateHashCode();
 
 		// calculate the XY numbers of the boundary tiles in this sub-file
-		this.boundaryTileBottom = MercatorProjection.latitudeToTileY(
+		this.boundaryTileBottom = Projection.latitudeToTileY(
 				subFileParameterBuilder.boundingBox.minLatitudeE6
 						/ COORDINATES_DIVISOR, this.baseZoomLevel);
-		this.boundaryTileLeft = MercatorProjection.longitudeToTileX(
+		this.boundaryTileLeft = Projection.longitudeToTileX(
 				subFileParameterBuilder.boundingBox.minLongitudeE6
 						/ COORDINATES_DIVISOR, this.baseZoomLevel);
-		this.boundaryTileTop = MercatorProjection.latitudeToTileY(
+		this.boundaryTileTop = Projection.latitudeToTileY(
 				subFileParameterBuilder.boundingBox.maxLatitudeE6
 						/ COORDINATES_DIVISOR, this.baseZoomLevel);
-		this.boundaryTileRight = MercatorProjection.longitudeToTileX(
+		this.boundaryTileRight = Projection.longitudeToTileX(
 				subFileParameterBuilder.boundingBox.maxLongitudeE6
 						/ COORDINATES_DIVISOR, this.baseZoomLevel);
 

src/org/oscim/generator/TileGenerator.java

@@ -41,7 +41,6 @@ import org.oscim.theme.renderinstruction.RenderInstruction;
 import org.oscim.theme.renderinstruction.Text;
 import org.oscim.utils.LineClipper;
 import org.oscim.view.DebugSettings;
-import org.oscim.view.MapView;
 
 import android.graphics.Bitmap;
 import android.graphics.Paint;
@@ -80,7 +79,7 @@ public class TileGenerator implements IRenderCallback, IMapDatabaseCallback {
 					new float[] { 0, 0, 0, Tile.TILE_SIZE,
 							Tile.TILE_SIZE, Tile.TILE_SIZE,
 							Tile.TILE_SIZE, 0, 0, 0 },
-					new short[1]),
+					new short[] {10}),
 			new Tag[] { new Tag("debug", "box") }
 			);
 
@@ -151,16 +150,14 @@ public class TileGenerator implements IRenderCallback, IMapDatabaseCallback {
 		setScaleStrokeWidth(mTile.zoomLevel);
 
 		// account for area changes with latitude
-		double latitude = MercatorProjection.pixelYToLatitude(mTile.pixelY + (Tile.TILE_SIZE >> 1),
+		double latitude = MercatorProjection.toLatitude(mTile.y);
-				mTile.zoomLevel);
+
 		mLatScaleFactor = 0.5f + 0.5f * ((float) Math.sin(Math.abs(latitude) * (Math.PI / 180)));
 
 		mGroundResolution = (float) (Math.cos(latitude * (Math.PI / 180))
 				* MercatorProjection.EARTH_CIRCUMFERENCE
 				/ ((long) Tile.TILE_SIZE << mTile.zoomLevel));
 
-		Log.d(TAG, mTile + " " + mGroundResolution);
-
 		mTile.layers = new Layers();
 
 		// query database, which calls renderWay and renderPOI
@@ -188,7 +185,6 @@ public class TileGenerator implements IRenderCallback, IMapDatabaseCallback {
 
 			// draw tile box
 			mWay = mDebugWay;
-			mWay.geom.index[0] = (short) (MapView.enableClosePolygons ? 8 : 10);
 			mDrawingLayer = 100 * renderLevels;
 			ri = renderTheme.matchWay(mDebugWay.tags, (byte) 0, false);
 			renderWay(ri, mDebugWay.tags);

src/org/oscim/overlay/BuildingOverlay.java

@@ -41,6 +41,8 @@ public class BuildingOverlay extends Overlay {
 	private final float mFadeTime = 300;
 	private float mAlpha = 1;
 
+	private final static int MIN_ZOOM = 17;
+
 	@Override
 	public boolean onTouchEvent(MotionEvent e) {
 		int action = e.getAction() & MotionEvent.ACTION_MASK;
@@ -48,7 +50,7 @@ public class BuildingOverlay extends Overlay {
 			multi++;
 		} else if (action == MotionEvent.ACTION_POINTER_UP) {
 			multi--;
-			if (mPrevZoom != 17 && mAlpha > 0) {
+			if (!mActive && mAlpha > 0) {
 				// finish hiding
 				//Log.d(TAG, "add multi hide timer " + mAlpha);
 				addShowTimer(mFadeTime * mAlpha, false);
@@ -65,19 +67,20 @@ public class BuildingOverlay extends Overlay {
 		return false;
 	}
 
-	private int mPrevZoom = 0;
+	private boolean mActive = false;
 
 	@Override
 	public void onUpdate(MapPosition mapPosition, boolean changed) {
-		int z = mapPosition.zoomLevel;
+		boolean show = mapPosition.scale >= (1 << MIN_ZOOM);
-		if (z == mPrevZoom)
+
+		if (show && mActive)
 			return;
 
-		if (z == 17) {
+		if (show) {
 			// start showing
 			//Log.d(TAG, "add show timer " + mAlpha);
 			addShowTimer(mFadeTime * (1 - mAlpha), true);
-		} else if (mPrevZoom == 17) {
+		} else if (mActive) {
 			// indicate hiding
 			if (multi > 0) {
 				//Log.d(TAG, "add fade timer " + mAlpha);
@@ -87,8 +90,7 @@ public class BuildingOverlay extends Overlay {
 				addShowTimer(mFadeTime * mAlpha, false);
 			}
 		}
-
+		mActive = show;
-		mPrevZoom = z;
 	}
 
 	void fade(float duration, long tick, boolean dir, float max) {

src/org/oscim/overlay/ItemizedOverlay.java

@@ -24,10 +24,12 @@ package org.oscim.overlay;
 import org.oscim.core.GeoPoint;
 import org.oscim.core.MapPosition;
 import org.oscim.core.MercatorProjection;
+import org.oscim.core.Tile;
 import org.oscim.overlay.OverlayItem.HotspotPlace;
 import org.oscim.renderer.GLRenderer.Matrices;
 import org.oscim.renderer.layer.SymbolLayer;
 import org.oscim.renderer.overlays.BasicOverlay;
+import org.oscim.utils.FastMath;
 import org.oscim.view.MapView;
 
 import android.content.res.Resources;
@@ -71,8 +73,8 @@ public abstract class ItemizedOverlay<Item extends OverlayItem> extends Overlay
 
 	private int mSize;
 
-	// pre-projected points to zoomlovel 20
+	// pre-projected points to zoomlovel 18
-	private static final byte MAX_ZOOM = 20;
+	private static final byte MAX_ZOOM = 18;
 
 	class ItemOverlay extends BasicOverlay {
 
@@ -95,9 +97,16 @@ public abstract class ItemizedOverlay<Item extends OverlayItem> extends Overlay
 
 			mUpdate = false;
 
-			int diff = MAX_ZOOM - curPos.zoomLevel;
+			//int mx = (int) curPos.x;
-			int mx = (int) curPos.x;
+			//int my = (int) curPos.y;
-			int my = (int) curPos.y;
+
+			//int z = curPos.zoomLevel;
+
+			int z = FastMath.log2((int) curPos.scale);
+			int diff = MAX_ZOOM - z;
+
+			int mx = (int) (curPos.x * (Tile.TILE_SIZE << z));
+			int my = (int) (curPos.y * (Tile.TILE_SIZE << z));
 
 			// limit could be 1 if we update on every position change
 			float limit = 1.5f;
@@ -122,6 +131,8 @@ public abstract class ItemizedOverlay<Item extends OverlayItem> extends Overlay
 				for (InternalItem it = mItems; it != null; it = it.next) {
 					it.x = (it.px >> diff) - mx;
 					it.y = (it.py >> diff) - my;
+					//it.x = it.px - mx;
+					//it.y = it.py - my;
 
 					if (it.x > max || it.x < -max || it.y > max || it.y < -max) {
 						if (it.visible) {
@@ -159,21 +170,22 @@ public abstract class ItemizedOverlay<Item extends OverlayItem> extends Overlay
 
 				// only update when zoomlevel changed, new items are visible
 				// or more than 10 of the current items became invisible
-				if (((curPos.zoomLevel == mMapPosition.zoomLevel || numVisible == 0)) &&
+				if ((numVisible == 0) && (changedVisible == 0 && changesInvisible < 10))
-						(changedVisible == 0 && changesInvisible < 10))
 					return;
 
 				// keep position for current state
 				// updateMapPosition();
-				// TODO add copy utility function
+				mMapPosition.copy(curPos);
-				mMapPosition.x = curPos.x;
+
-				mMapPosition.y = curPos.y;
+				//mMapPosition.x = curPos.x;
-				mMapPosition.zoomLevel = curPos.zoomLevel;
+				//mMapPosition.y = curPos.y;
-				mMapPosition.scale = curPos.scale;
+				//mMapPosition.zoomLevel = curPos.zoomLevel;
-				mMapPosition.angle = curPos.angle;
+				//mMapPosition.scale = curPos.scale;
+				//mMapPosition.angle = curPos.angle;
 
 				// items are placed relative to scale == 1
-				mMapPosition.scale = 1;
+				// mMapPosition.scale = 1;
+				mMapPosition.scale = 1 << z;
 
 				layers.clear();
 
@@ -423,7 +435,7 @@ public abstract class ItemizedOverlay<Item extends OverlayItem> extends Overlay
 		return marker;
 	}
 
-	public static Drawable makeMarker(Resources res, int id, HotspotPlace place){
+	public static Drawable makeMarker(Resources res, int id, HotspotPlace place) {
 		Drawable marker = res.getDrawable(id);
 		if (place == null)
 			boundToHotspot(marker, HotspotPlace.CENTER);

src/org/oscim/overlay/PathOverlay.java

@@ -22,6 +22,7 @@ import java.util.List;
 import org.oscim.core.GeoPoint;
 import org.oscim.core.MapPosition;
 import org.oscim.core.MercatorProjection;
+import org.oscim.core.Tile;
 import org.oscim.renderer.GLRenderer.Matrices;
 import org.oscim.renderer.layer.Layer;
 import org.oscim.renderer.layer.LineLayer;
@@ -108,12 +109,6 @@ public class PathOverlay extends Overlay {
 
 			int size = mSize;
 
-			// keep position to render relative to current state
-			mMapPosition.copy(curPos);
-
-			// items are placed relative to scale == 1
-			mMapPosition.scale = 1;
-
 			// layers.clear();
 			LineLayer ll = (LineLayer) layers.getLayer(1, Layer.LINE);
 			// reset verticesCnt to reuse layer
@@ -124,15 +119,22 @@ public class PathOverlay extends Overlay {
 			int x, y, px = 0, py = 0;
 			int i = 0;
 
-			int diff = MAX_ZOOM - mMapPosition.zoomLevel;
+			//int mx = (int) mMapPosition.x;
-			int mx = (int) mMapPosition.x;
+			//int my = (int) mMapPosition.y;
-			int my = (int) mMapPosition.y;
+			//int z = curPos.zoomLevel;
+			int z = FastMath.log2((int) curPos.scale);
+			int diff = MAX_ZOOM - z;
+			int mx = (int) (curPos.x * (Tile.TILE_SIZE << z));
+			int my = (int) (curPos.y * (Tile.TILE_SIZE << z));
 
 			for (int j = 0; j < size; j += 2) {
 				// TODO translate mapPosition and do this after clipping
 				x = (mPreprojected[j + 0] >> diff) - mx;
 				y = (mPreprojected[j + 1] >> diff) - my;
 
+				//x = (mPreprojected[j + 0]) - mx;
+				//y = (mPreprojected[j + 1]) - my;
+
 				// TODO use line clipping, this doesnt work with 'GreatCircle'
 				// TODO clip to view bounding box
 				if (x > max || x < -max || y > max || y < -max) {
@@ -157,6 +159,12 @@ public class PathOverlay extends Overlay {
 			mIndex[0] = (short) i;
 			ll.addLine(projected, mIndex, false);
 
+			// keep position to render relative to current state
+			mMapPosition.copy(curPos);
+
+			// items are placed relative to scale 1
+			mMapPosition.scale = 1 << z;
+
 			newData = true;
 
 		}

src/org/oscim/renderer/GLRenderer.java

@@ -35,7 +35,6 @@ import org.oscim.core.Tile;
 import org.oscim.renderer.layer.Layers;
 import org.oscim.renderer.overlays.RenderOverlay;
 import org.oscim.theme.RenderTheme;
-import org.oscim.utils.FastMath;
 import org.oscim.utils.GlUtils;
 import org.oscim.utils.Matrix4;
 import org.oscim.view.MapView;
@@ -317,31 +316,21 @@ public class GLRenderer implements GLSurfaceView.Renderer {
 			for (int i = 0; i < mDrawTiles.cnt; i++)
 				tiles[i].isVisible = false;
 
-			// relative zoom-level, 'tiles' could not have been updated after
+			int z = tiles[0].zoomLevel;
-			// zoom-level changed.
-			float div = FastMath.pow(pos.zoomLevel - tiles[0].zoomLevel);
 
-			// draw additional tiles on max zoom-level:
+			double curScale = Tile.TILE_SIZE * pos.scale;
-			// to make sure buildings that are half visible but
+			double tileScale = Tile.TILE_SIZE * (pos.scale / (1 << z));
-			// the not ground tile are still drawn.
-			float scale = pos.scale;
-			if (scale > 2)
-				scale = 2;
 
-			// transform screen coordinates to tile coordinates
-			float tileScale = scale * div * Tile.TILE_SIZE;
-			double px = pos.x * scale;
-			double py = pos.y * scale;
 			for (int i = 0; i < 8; i += 2) {
-				coords[i + 0] = (float) (px + coords[i + 0]) / tileScale;
+				coords[i + 0] = (float) ((pos.x * curScale + coords[i + 0]) / tileScale);
-				coords[i + 1] = (float) (py + coords[i + 1]) / tileScale;
+				coords[i + 1] = (float) ((pos.y * curScale + coords[i + 1]) / tileScale);
 			}
 
 			// count placeholder tiles
 			mNumTileHolder = 0;
 
 			// check visibile tiles
-			mScanBox.scan(coords, tiles[0].zoomLevel);
+			mScanBox.scan(coords, z);
 		}
 	}
 
@@ -451,21 +440,23 @@ public class GLRenderer implements GLSurfaceView.Renderer {
 			return;
 
 		boolean tilesChanged = false;
+		boolean positionChanged = false;
+
 		// check if the tiles have changed...
 		if (serial != mDrawTiles.serial) {
-			mMapPosition.zoomLevel = -1;
 			tilesChanged = true;
+			// FIXME needed?
+			positionChanged = true;
 		}
 
 		// get current MapPosition, set mTileCoords (mapping of screen to model
 		// coordinates)
 		MapPosition pos = mMapPosition;
-		boolean positionChanged;
 
 		synchronized (mMapViewPosition) {
 			mMapViewPosition.updateAnimation();
 
-			positionChanged = mMapViewPosition.getMapPosition(pos);
+			positionChanged |= mMapViewPosition.getMapPosition(pos);
 
 			if (positionChanged)
 				mMapViewPosition.getMapViewProjection(mTileCoords);

src/org/oscim/renderer/LineRenderer.java

@@ -23,7 +23,6 @@ import static android.opengl.GLES20.glUniform1f;
 import static android.opengl.GLES20.glVertexAttribPointer;
 
 import org.oscim.core.MapPosition;
-import org.oscim.generator.TileGenerator;
 import org.oscim.renderer.GLRenderer.Matrices;
 import org.oscim.renderer.layer.Layer;
 import org.oscim.renderer.layer.Layers;
@@ -130,15 +129,17 @@ public final class LineRenderer {
 		//glUniformMatrix4fv(hLineMatrix[mode], 1, false, matrix, 0);
 		m.mvp.setAsUniform(hLineMatrix[mode]);
 
+		//int zoom = FastMath.log2((int) pos.absScale);
 		int zoom = pos.zoomLevel;
-		float scale = pos.scale;
+
+		double scale = pos.getZoomScale();
 
 		// Line scale factor for non fixed lines: Within a zoom-
 		// level lines would be scaled by the factor 2 by view-matrix.
 		// Though lines should only scale by sqrt(2). This is achieved
 		// by inverting scaling of extrusion vector with: width/sqrt(s).
 		// within one zoom-level: 1 <= s <= 2
-		float s = scale / div;
+		double s = scale / div;
 		float lineScale = (float) Math.sqrt(s * 2 / 2.2);
 
 		// scale factor to map one pixel on tile to one pixel on screen:
@@ -146,7 +147,7 @@ public final class LineRenderer {
 		float pixel = 0;
 
 		if (mode == 1)
-			pixel = 1.5f / s;
+			pixel = (float) (1.5 / s);
 
 		glUniform1f(uLineScale, pixel);
 		int lineMode = 0;
@@ -154,7 +155,7 @@ public final class LineRenderer {
 
 		boolean blur = false;
 		// dont increase scale when max is reached
-		boolean strokeMaxZoom = zoom > TileGenerator.STROKE_MAX_ZOOM_LEVEL;
+		//boolean strokeMaxZoom = zoom > TileGenerator.STROKE_MAX_ZOOM_LEVEL;
 
 		Layer l = curLayer;
 		for (; l != null && l.type == Layer.LINE; l = l.next) {
@@ -167,7 +168,7 @@ public final class LineRenderer {
 			} else if (line.fade > zoom) {
 				continue;
 			} else {
-				float alpha = (scale > 1.2f ? scale : 1.2f) - 1f;
+				float alpha = (float) (scale > 1.2 ? scale : 1.2) - 1;
 				GlUtils.setColor(uLineColor, line.color, alpha);
 			}
 
@@ -180,10 +181,10 @@ public final class LineRenderer {
 				// draw linelayers references by this outline
 				for (LineLayer o = ll.outlines; o != null; o = o.outlines) {
 
-					if (o.line.fixed || strokeMaxZoom) {
+					if (o.line.fixed /* || strokeMaxZoom */) {
-						width = (ll.width + o.width) / s;
+						width = (float) ((ll.width + o.width) / s);
 					} else {
-						width = ll.width / s + o.width / lineScale;
+						width = (float) (ll.width / s + o.width / lineScale);
 
 						// check min-size for outline
 						if (o.line.min > 0 && o.width * lineScale < o.line.min * 2)
@@ -193,7 +194,7 @@ public final class LineRenderer {
 					glUniform1f(uLineWidth, width * COORD_SCALE_BY_DIR_SCALE);
 
 					if (line.blur != 0) {
-						glUniform1f(uLineScale, 1f - (line.blur / s));
+						glUniform1f(uLineScale, (float) (1 - (line.blur / s)));
 						blur = true;
 					} else if (mode == 1) {
 						glUniform1f(uLineScale, pixel / width);
@@ -212,10 +213,10 @@ public final class LineRenderer {
 				}
 			} else {
 
-				if (line.fixed || strokeMaxZoom) {
+				if (line.fixed /* || strokeMaxZoom */) {
 					// invert scaling of extrusion vectors so that line
 					// width stays the same.
-					width = ll.width / s;
+					width = (float) (ll.width / s);
 				} else {
 					// reduce linear scaling of extrusion vectors so that
 					// line width increases by sqrt(2.2).

src/org/oscim/renderer/LineTexRenderer.java

@@ -130,7 +130,9 @@ public class LineTexRenderer {
 
 		GLES20.glBindBuffer(GLES20.GL_ARRAY_BUFFER, layers.vbo.id);
 
-		float s = pos.scale / div;
+		float scale = (float)pos.getZoomScale();
+
+		float s = scale / div;
 
 		//GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, mTexID[0]);
 
@@ -146,7 +148,7 @@ public class LineTexRenderer {
 			GLES20.glUniform1f(hPatternScale, (GLRenderer.COORD_SCALE * line.stipple) / ps);
 			GLES20.glUniform1f(hPatternWidth, line.stippleWidth);
 
-			GLES20.glUniform1f(hScale, pos.scale);
+			GLES20.glUniform1f(hScale, scale);
 			// keep line width fixed
 			GLES20.glUniform1f(hWidth, ll.width / s * COORD_SCALE_BY_DIR_SCALE);
 

src/org/oscim/renderer/MapTile.java

@@ -24,6 +24,9 @@ import org.oscim.renderer.layer.TextItem;
  */
 public final class MapTile extends JobTile {
 
+	public double x;
+	public double y;
+
 	/**
 	 * Tile data set by TileGenerator.
 	 */
@@ -73,6 +76,8 @@ public final class MapTile extends JobTile {
 
 	MapTile(int tileX, int tileY, byte zoomLevel) {
 		super(tileX, tileY, zoomLevel);
+		this.x = (double)tileX / (1 << zoomLevel);
+		this.y = (double)tileY / (1 << zoomLevel);
 	}
 
 	/**

src/org/oscim/renderer/PolygonRenderer.java

@@ -179,6 +179,8 @@ public final class PolygonRenderer {
 
 		int start = cur;
 
+		float scale = (float)pos.getZoomScale();
+
 		Layer l = layer;
 		for (; l != null && l.type == Layer.POLYGON; l = l.next) {
 			PolygonLayer pl = (PolygonLayer) l;
@@ -204,13 +206,13 @@ public final class PolygonRenderer {
 
 			// draw up to 7 layers into stencil buffer
 			if (cur == STENCIL_BITS - 1) {
-				fillPolygons(start, cur, zoom, pos.scale);
+				fillPolygons(start, cur, zoom, scale);
 				start = cur = 0;
 			}
 		}
 
 		if (cur > 0)
-			fillPolygons(start, cur, zoom, pos.scale);
+			fillPolygons(start, cur, zoom, scale);
 
 		if (clip) {
 			if (first) {
@@ -318,7 +320,9 @@ public final class PolygonRenderer {
 			glColorMask(false, false, false, false);
 		}
 		// always pass stencil test:
-		glStencilFunc(GL_ALWAYS, 0x00, 0x00);
+		//glStencilFunc(GL_ALWAYS, 0x00, 0x00);
+		glStencilFunc(GL_EQUAL, CLIP_BIT, CLIP_BIT);
+
 		// write to all bits
 		glStencilMask(0xFF);
 		// zero out area to draw to

src/org/oscim/renderer/TextureRenderer.java

@@ -122,7 +122,7 @@ public final class TextureRenderer {
 			+ "       pos = u_proj * (u_mv * vec4(vertex.xy + dir * u_scale, 0.0, 1.0));"
 			+ "  } else {" // place as billboard
 			+ "    vec4 center = u_mv * vec4(vertex.xy, 0.0, 1.0);"
-			+ "    pos = u_proj * (center + vec4(dir * (coord_scale * u_swidth), 0.1, 0.0));"
+			+ "    pos = u_proj * (center + vec4(dir * (coord_scale * u_swidth), 0.0, 0.0));"
 			+ "  }"
 			+ "  gl_Position = pos;"
 			+ "  tex_c = tex_coord * div;"

src/org/oscim/renderer/TileManager.java

@@ -28,6 +28,7 @@ import org.oscim.generator.JobTile;
 import org.oscim.generator.TileDistanceSort;
 import org.oscim.renderer.layer.TextItem;
 import org.oscim.renderer.layer.VertexPool;
+import org.oscim.utils.FastMath;
 import org.oscim.view.MapView;
 import org.oscim.view.MapViewPosition;
 
@@ -42,6 +43,8 @@ import android.util.Log;
  */
 public class TileManager {
 	static final String TAG = TileManager.class.getSimpleName();
+	private final static int MAX_ZOOMLEVEL = 17;
+	private final static int MIN_ZOOMLEVEL = 2;
 
 	// limit number tiles with new data not uploaded to GL
 	// TODO this should depend on the number of tiles displayed
@@ -148,10 +151,10 @@ public class TileManager {
 	 * 2. Add not yet loaded (or loading) tiles to JobQueue.
 	 * 3. Manage cache
 	 *
-	 * @param mapPosition
+	 * @param pos
 	 *            current MapPosition
 	 */
-	public synchronized void update(MapPosition mapPosition) {
+	public synchronized void update(MapPosition pos) {
 		// clear JobQueue and set tiles to state == NONE.
 		// one could also append new tiles and sort in JobQueue
 		// but this has the nice side-effect that MapWorkers dont
@@ -162,22 +165,38 @@ public class TileManager {
 
 		// scale and translate projection to tile coordinates
 		// load some tiles more than currently visible (* 0.75)
-		float scale = mapPosition.scale * 0.75f;
+		//		float scale = mapPosition.scale * 0.75f;
-		float tileScale = scale * Tile.TILE_SIZE;
+		//		float tileScale = scale * Tile.TILE_SIZE;
-		double px = mapPosition.x * scale;
+		//		double px = mapPosition.x * scale;
-		double py = mapPosition.y * scale;
+		//		double py = mapPosition.y * scale;
+		//
+		//		float[] coords = mTileCoords;
+		//		mMapViewPosition.getMapViewProjection(coords);
+		//		for (int i = 0; i < 8; i += 2) {
+		//			coords[i + 0] = (float)(px + coords[i + 0]) / tileScale;
+		//			coords[i + 1] = (float)(py + coords[i + 1]) / tileScale;
+		//		}
+
+		// scale and translate projection to tile coordinates
+		// load some tiles more than currently visible (* 0.75)
+		double scale = pos.scale * 0.75f;
+		double curScale = Tile.TILE_SIZE * scale;
+		int zoomLevel = FastMath.clamp(pos.zoomLevel, MIN_ZOOMLEVEL, MAX_ZOOMLEVEL);
+
+		double tileScale = Tile.TILE_SIZE * (scale / (1 << zoomLevel));
 
 		float[] coords = mTileCoords;
 		mMapViewPosition.getMapViewProjection(coords);
+
 		for (int i = 0; i < 8; i += 2) {
-			coords[i + 0] = (float)(px + coords[i + 0]) / tileScale;
+			coords[i + 0] = (float) ((pos.x * curScale + coords[i + 0]) / tileScale);
-			coords[i + 1] = (float)(py + coords[i + 1]) / tileScale;
+			coords[i + 1] = (float) ((pos.y * curScale + coords[i + 1]) / tileScale);
 		}
 
 		// scan visible tiles. callback function calls 'addTile'
 		// which sets mNewTiles
 		mNewTiles.cnt = 0;
-		mScanBox.scan(coords, mapPosition.zoomLevel);
+		mScanBox.scan(coords, zoomLevel);
 
 		MapTile[] newTiles = mNewTiles.tiles;
 		MapTile[] curTiles = mCurrentTiles.tiles;
@@ -225,7 +244,7 @@ public class TileManager {
 
 		JobTile[] jobs = new JobTile[mJobs.size()];
 		jobs = mJobs.toArray(jobs);
-		updateTileDistances(jobs, jobs.length, mapPosition);
+		updateTileDistances(jobs, jobs.length, pos);
 
 		// sets tiles to state == LOADING
 		mMapView.addJobs(jobs);
@@ -237,7 +256,7 @@ public class TileManager {
 		if (remove > CACHE_THRESHOLD ||
 				mTilesForUpload > MAX_TILES_IN_QUEUE)
 
-			limitCache(mapPosition, remove);
+			limitCache(pos, remove);
 	}
 
 	// need to keep track of TileSets to clear on reset...
@@ -295,7 +314,7 @@ public class TileManager {
 		tile = QuadTree.getTile(x, y, zoomLevel);
 
 		if (tile == null) {
-			tile = new MapTile(x, y, (byte)zoomLevel);
+			tile = new MapTile(x, y, (byte) zoomLevel);
 			QuadTree.add(tile);
 			mJobs.add(tile);
 			addToCache(tile);
@@ -389,11 +408,13 @@ public class TileManager {
 
 	private static void updateTileDistances(Object[] tiles, int size, MapPosition mapPosition) {
 		// TODO there is probably  a better quad-tree distance function
-		double x = mapPosition.x;
+
-		double y = mapPosition.y;
 		int zoom = mapPosition.zoomLevel;
-		int h = Tile.TILE_SIZE >> 1;
+		double x = mapPosition.x * (1 << zoom);
-		long center = h << zoom;
+		double y = mapPosition.y * (1 << zoom);
+
+		final float h = 0.5f;
+		long center = (long)(h * (1 << zoom));
 
 		for (int i = 0; i < size; i++) {
 			JobTile t = (JobTile) tiles[i];
@@ -405,16 +426,16 @@ public class TileManager {
 			dz = 0;
 
 			if (diff == 0) {
-				dx = (t.pixelX + h) - x;
+				dx = (t.tileX + h) - x;
-				dy = (t.pixelY + h) - y;
+				dy = (t.tileY + h) - y;
 				scale = 0.5f;
 			} else if (diff > 0) {
 				// tile zoom level is greater than current
 				// NB: distance increase by the factor 2
 				// with each zoom-level, so that children
 				// will be kept less likely than parent tiles.
-				dx = (t.pixelX + h) - x * (1 << diff);
+				dx = (t.tileX + h) - x * (1 << diff);
-				dy = (t.pixelY + h) - y * (1 << diff);
+				dy = (t.tileY + h) - y * (1 << diff);
 				// add tilesize/2 with each zoom-level
 				// so that children near the current
 				// map position but a few levels above
@@ -424,8 +445,8 @@ public class TileManager {
 			} else {
 				diff = -diff;
 				// tile zoom level is smaller than current
-				dx = (t.pixelX + h) - x / (1 << diff);
+				dx = (t.tileX + h) - x / (1 << diff);
-				dy = (t.pixelY + h) - y / (1 << diff);
+				dy = (t.tileY + h) - y / (1 << diff);
 				dz = diff * h;
 				scale = 0.5f * (1 << diff);
 			}

src/org/oscim/renderer/TileRenderer.java

@@ -19,6 +19,7 @@ import static android.opengl.GLES20.glStencilMask;
 import static org.oscim.generator.JobTile.STATE_READY;
 
 import org.oscim.core.MapPosition;
+import org.oscim.core.Tile;
 import org.oscim.renderer.GLRenderer.Matrices;
 import org.oscim.renderer.layer.Layer;
 import org.oscim.utils.FastMath;
@@ -68,21 +69,25 @@ public class TileRenderer {
 				drawTile(t, pos);
 		}
 
+		 double scale = pos.getZoomScale();
+
 		// Draw parent or children as proxy for visibile tiles that dont
 		// have data yet. Proxies are clipped to the region where nothing
 		// was drawn to depth buffer.
 		// TODO draw proxies for placeholder
 		for (int i = 0; i < tileCnt; i++) {
 			MapTile t = tiles[i];
-			if (t.isVisible && (t.state != STATE_READY) && (t.holder == null))
+			if (t.isVisible && (t.state != STATE_READY) && (t.holder == null)){
-				drawProxyTile(t, pos, true);
+				boolean preferParent = (scale > 1.5) || (pos.zoomLevel - t.zoomLevel < 0);
+				drawProxyTile(t, pos, true, preferParent);
+			}
 		}
 
 		// Draw grandparents
 		for (int i = 0; i < tileCnt; i++) {
 			MapTile t = tiles[i];
 			if (t.isVisible && (t.state != STATE_READY) && (t.holder == null))
-				drawProxyTile(t, pos, false);
+				drawProxyTile(t, pos, false, false);
 		}
 
 		// make sure stencil buffer write is disabled
@@ -116,13 +121,18 @@ public class TileRenderer {
 		GLES20.glBindBuffer(GL_ARRAY_BUFFER, t.layers.vbo.id);
 
 		// place tile relative to map position
-		float div = FastMath.pow(tile.zoomLevel - pos.zoomLevel);
+		int z = tile.zoomLevel;
-		float x = (float) (tile.pixelX - pos.x * div);
+
-		float y = (float) (tile.pixelY - pos.y * div);
+		float div = FastMath.pow(z - pos.zoomLevel);
-		float scale = pos.scale / div;
+
+		double curScale = Tile.TILE_SIZE * pos.scale;
+		double scale = (pos.scale / (1 << z));
+
+		float x = (float) ((tile.x - pos.x) * curScale);
+		float y = (float) ((tile.y - pos.y) * curScale);
 
 		Matrices m = mMatrices;
-		m.mvp.setTransScale(x * scale, y * scale, scale / GLRenderer.COORD_SCALE);
+		m.mvp.setTransScale(x, y, (float)(scale / GLRenderer.COORD_SCALE));
 
 		m.mvp.multiplyMM(mProjMatrix, m.mvp);
 
@@ -168,7 +178,8 @@ public class TileRenderer {
 		}
 
 		// clear clip-region and could also draw 'fade-effect'
-		PolygonRenderer.drawOver(m, true, 0x22000000);
+		//PolygonRenderer.drawOver(m, true, 0x22000000);
+		PolygonRenderer.drawOver(m, false, 0);
 	}
 
 	private static int drawProxyChild(MapTile tile, MapPosition pos) {
@@ -187,12 +198,14 @@ public class TileRenderer {
 		return drawn;
 	}
 
-	private static void drawProxyTile(MapTile tile, MapPosition pos, boolean parent) {
+	// just FIXME!
-		int diff = pos.zoomLevel - tile.zoomLevel;
+	private static void drawProxyTile(MapTile tile, MapPosition pos, boolean parent, boolean preferParent) {
+		//int diff = pos.zoomLevel - tile.zoomLevel;
 		QuadTree r = tile.rel;
 		MapTile proxy;
 
-		if (pos.scale > 1.5f || diff < 0) {
+
+		if (!preferParent) {
 			// prefer drawing children
 			if (drawProxyChild(tile, pos) == 4)
 				return;

src/org/oscim/renderer/overlays/BasicOverlay.java

@@ -46,35 +46,36 @@ public abstract class BasicOverlay extends RenderOverlay {
 	 * use synchronized when modifying layers
 	 */
 	@Override
-	public synchronized void render(MapPosition pos, Matrices m) {
+	public synchronized void render(MapPosition curPos, Matrices m) {
+		MapPosition pos = mMapPosition;
 
-		float div = FastMath.pow(mMapPosition.zoomLevel - pos.zoomLevel);
+		float div = FastMath.pow(pos.zoomLevel - curPos.zoomLevel);
 
 		GLES20.glBindBuffer(GLES20.GL_ARRAY_BUFFER, layers.vbo.id);
 		GLState.test(false, false);
 
 		if (layers.baseLayers != null) {
-			setMatrix(pos, m, true);
+			setMatrix(curPos, m, true);
 
 			for (Layer l = layers.baseLayers; l != null;) {
 				switch (l.type) {
 					case Layer.POLYGON:
-						l = PolygonRenderer.draw(pos, l, m, true, false);
+						l = PolygonRenderer.draw(curPos, l, m, true, false);
 						break;
 					case Layer.LINE:
-						l = LineRenderer.draw(layers, l, pos, m, div, 0);
+						l = LineRenderer.draw(layers, l, curPos, m, div, 0);
 						break;
 					case Layer.TEXLINE:
-						l = LineTexRenderer.draw(layers, l, pos, m, div);
+						l = LineTexRenderer.draw(layers, l, curPos, m, div);
 						break;
 				}
 			}
 		}
 
 		if (layers.textureLayers != null) {
-			setMatrix(pos, m, false);
+			setMatrix(curPos, m, false);
 
-			float scale = (mMapPosition.scale / pos.scale) * div;
+			float scale = (float)(pos.scale / curPos.scale);
 
 			for (Layer l = layers.textureLayers; l != null;) {
 				l = TextureRenderer.draw(l, scale, m);

src/org/oscim/renderer/overlays/ExtrusionOverlay.java

@@ -19,6 +19,7 @@ import java.nio.ByteOrder;
 import java.nio.ShortBuffer;
 
 import org.oscim.core.MapPosition;
+import org.oscim.core.Tile;
 import org.oscim.generator.JobTile;
 import org.oscim.renderer.GLRenderer;
 import org.oscim.renderer.GLRenderer.Matrices;
@@ -26,7 +27,6 @@ import org.oscim.renderer.GLState;
 import org.oscim.renderer.MapTile;
 import org.oscim.renderer.TileSet;
 import org.oscim.renderer.layer.ExtrusionLayer;
-import org.oscim.utils.FastMath;
 import org.oscim.utils.GlUtils;
 import org.oscim.view.MapView;
 
@@ -173,7 +173,7 @@ public class ExtrusionOverlay extends RenderOverlay {
 
 		MapTile[] tiles = mTiles;
 
-		float div = FastMath.pow(tiles[0].zoomLevel - pos.zoomLevel);
+		//float div = FastMath.pow(tiles[0].zoomLevel - pos.zoomLevel);
 
 		int shaderMode = 1;
 		int uExtAlpha = hAlpha[shaderMode];
@@ -195,7 +195,7 @@ public class ExtrusionOverlay extends RenderOverlay {
 			for (int i = 0; i < mTileCnt; i++) {
 				ExtrusionLayer el = (ExtrusionLayer) tiles[i].layers.extrusionLayers;
 
-				setMatrix(pos, m, tiles[i], div, 0);
+				setMatrix(pos, m, tiles[i], 0);
 				m.mvp.setAsUniform(uExtMatrix);
 
 				GLES20.glBindBuffer(GLES20.GL_ELEMENT_ARRAY_BUFFER, el.mIndicesBufferID);
@@ -230,7 +230,7 @@ public class ExtrusionOverlay extends RenderOverlay {
 
 		GLState.useProgram(shaderProgram[shaderMode]);
 		GLState.enableVertexArrays(uExtVertexPosition, -1);
-		if (pos.scale < 2) {
+		if (pos.scale < (1 << 18)) {
 			// chances are high that one moves through a building
 			// with scale > 2 also draw back sides in this case.
 			GLES20.glEnable(GLES20.GL_CULL_FACE);
@@ -247,7 +247,7 @@ public class ExtrusionOverlay extends RenderOverlay {
 			MapTile t = tiles[i];
 			ExtrusionLayer el = (ExtrusionLayer) t.layers.extrusionLayers;
 			int d = GLRenderer.depthOffset(t) * 10;
-			setMatrix(pos, m, t, div, d);
+			setMatrix(pos, m, t, d);
 			m.mvp.setAsUniform(uExtMatrix);
 
 			GLES20.glBindBuffer(GLES20.GL_ELEMENT_ARRAY_BUFFER, el.mIndicesBufferID);
@@ -273,7 +273,7 @@ public class ExtrusionOverlay extends RenderOverlay {
 
 			GLES20.glDepthFunc(GLES20.GL_EQUAL);
 			int d = GLRenderer.depthOffset(t) * 10;
-			setMatrix(pos, m, t, div, d);
+			setMatrix(pos, m, t, d);
 			m.mvp.setAsUniform(uExtMatrix);
 
 			GLES20.glBindBuffer(GLES20.GL_ELEMENT_ARRAY_BUFFER, el.mIndicesBufferID);
@@ -316,19 +316,28 @@ public class ExtrusionOverlay extends RenderOverlay {
 			tiles[i] = null;
 		}
 
-		if (pos.scale < 2)
+		if (pos.scale < (1 << 18))
 			GLES20.glDisable(GLES20.GL_CULL_FACE);
+
 		GLES20.glBindBuffer(GLES20.GL_ELEMENT_ARRAY_BUFFER, 0);
 	}
 
-	private static void setMatrix(MapPosition mapPosition, Matrices m,
+	private static void setMatrix(MapPosition pos, Matrices m,
-			MapTile tile, float div, int delta) {
+			MapTile tile, int delta) {
 
-		float x = (float) (tile.pixelX - mapPosition.x * div);
+		int z = tile.zoomLevel;
-		float y = (float) (tile.pixelY - mapPosition.y * div);
+		double curScale = Tile.TILE_SIZE * pos.scale;
-		float scale = mapPosition.scale / div;
+		float scale = (float)(pos.scale / (1 << z));
 
-		m.mvp.setTransScale(x * scale, y * scale, scale / GLRenderer.COORD_SCALE);
+		float x = (float) ((tile.x - pos.x) * curScale);
+		float y = (float) ((tile.y - pos.y) * curScale);
+		m.mvp.setTransScale(x, y, scale / GLRenderer.COORD_SCALE);
+
+//		float x = (float) (tile.pixelX - mapPosition.x * div);
+//		float y = (float) (tile.pixelY - mapPosition.y * div);
+//		float scale = mapPosition.scale / div;
+//
+//		m.mvp.setTransScale(x * scale, y * scale, scale / GLRenderer.COORD_SCALE);
 
 		// scale height
 		m.mvp.setValue(10, scale / 10);

src/org/oscim/renderer/overlays/GridOverlay.java

@@ -93,7 +93,6 @@ public class GridOverlay extends BasicOverlay {
 			}
 		}
 		tl.prepare();
-
 		layers.textureLayers = tl;
 	}
 
@@ -101,30 +100,28 @@ public class GridOverlay extends BasicOverlay {
 	private int mCurY = -1;
 	private int mCurZ = -1;
 
-	private boolean finished;
-
-
 	@Override
 	public synchronized void update(MapPosition curPos, boolean positionChanged,
 			boolean tilesChanged, Matrices matrices) {
 
-		mMapPosition.copy(curPos);
+		int z = 1 << curPos.zoomLevel;
 
-		// fix map position to tile coordinates
+		int x = (int) (curPos.x * z);
-		float size = Tile.TILE_SIZE;
+		int y = (int) (curPos.y * z);
-		int x = (int) (mMapPosition.x / size);
-		int y = (int) (mMapPosition.y / size);
-		mMapPosition.x = x * size;
-		mMapPosition.y = y * size;
-
-		if (!finished)
-			mMapPosition.scale = 1;
 
 		// update layers when map moved by at least one tile
-		if (x != mCurX || y != mCurY || mMapPosition.zoomLevel != mCurZ) {
+		if (x != mCurX || y != mCurY || z != mCurZ) {
+
+			MapPosition pos = mMapPosition;
+
+			pos.copy(curPos);
+			pos.x = (double) x / z;
+			pos.y = (double) y / z;
+			pos.scale = z;
+
 			mCurX = x;
 			mCurY = y;
-			mCurZ = mMapPosition.zoomLevel;
+			mCurZ = z;
 
 			layers.clear();
 
@@ -134,9 +131,7 @@ public class GridOverlay extends BasicOverlay {
 			ll.addLine(mPoints, mIndex, false);
 
 			addLabels(x, y, mCurZ);
-
 			newData = true;
-			finished = false;
 		}
 	}
 }

src/org/oscim/renderer/overlays/RenderOverlay.java

@@ -18,7 +18,6 @@ import org.oscim.core.MapPosition;
 import org.oscim.core.Tile;
 import org.oscim.renderer.GLRenderer;
 import org.oscim.renderer.GLRenderer.Matrices;
-import org.oscim.utils.FastMath;
 import org.oscim.view.MapView;
 
 public abstract class RenderOverlay {
@@ -51,7 +50,8 @@ public abstract class RenderOverlay {
 	 *            true when current tiles changed
 	 * @param matrices TODO
 	 */
-	public abstract void update(MapPosition curPos, boolean positionChanged, boolean tilesChanged, Matrices matrices);
+	public abstract void update(MapPosition curPos, boolean positionChanged, boolean tilesChanged,
+			Matrices matrices);
 
 	/**
 	 * called 2. compile everything for drawing
@@ -70,44 +70,40 @@ public abstract class RenderOverlay {
 	public abstract void render(MapPosition pos, Matrices m);
 
 	/**
-	 * Utility: set m.mvp matrix relative to the difference of current MapPosition
+	 * Utility: set m.mvp matrix relative to the difference of current
+	 * MapPosition
 	 * and the last updated Overlay MapPosition
 	 *
-	 * @param curPos ...
+	 * @param curPos
-	 * @param m ...
+	 *            current MapPosition
+	 * @param m
+	 *            current Matrices
 	 * @param project
-	 *  apply view and projection, or just view otherwise
+	 *            apply view and projection, or just view otherwise
 	 */
 	protected void setMatrix(MapPosition curPos, Matrices m, boolean project) {
 		MapPosition oPos = mMapPosition;
 
-		float div = FastMath.pow(oPos.zoomLevel - curPos.zoomLevel);
+		double tileScale = Tile.TILE_SIZE * curPos.scale;
 
-		// translate relative to map center
+		double x = oPos.x - curPos.x;
-		float x = (float) (oPos.x - curPos.x * div);
+		double y = oPos.y - curPos.y;
-		float y = (float) (oPos.y - curPos.y * div);
 
-		// flip around date-line
+		// wrap around date-line
-		float max = (Tile.TILE_SIZE << oPos.zoomLevel);
+		while (x < 0)
-		if (x < -max / 2)
+			x += 1.0;
-			x = max + x;
+		while (x > 1)
-		else if (x > max / 2)
+			x -= 1.0;
-			x = x - max;
 
-		// scale to current tile world coordinates
+		m.mvp.setTransScale((float) (x * tileScale), (float) (y * tileScale),
-		float scale = curPos.scale / div;
+				(float) ((curPos.scale / oPos.scale) / GLRenderer.COORD_SCALE));
-
-		// set scale to be relative to current scale
-		float s = (curPos.scale / oPos.scale) / div;
-
-		m.mvp.setTransScale(x * scale, y * scale,
-				s / GLRenderer.COORD_SCALE);
 
 		m.mvp.multiplyMM(project ? m.viewproj : m.view, m.mvp);
 	}
 
 	/**
-	 * Utility: set m.mvp matrix relative to the difference of current MapPosition
+	 * Utility: set m.mvp matrix relative to the difference of current
+	 * MapPosition
 	 * and the last updated Overlay MapPosition and add m.viewproj
 	 *
 	 * @param curPos ...
@@ -116,13 +112,4 @@ public abstract class RenderOverlay {
 	protected void setMatrix(MapPosition curPos, Matrices m) {
 		setMatrix(curPos, m, true);
 	}
-
-//	/**
-//	 * Utility: update mMapPosition
-//	 *
-//	 * @return true if position has changed
-//	 */
-//	protected boolean updateMapPosition() {
-//		return mMapView.getMapViewPosition().getMapPosition(mMapPosition);
-//	}
 }

src/org/oscim/renderer/overlays/TextOverlay.java

@@ -246,6 +246,7 @@ public class TextOverlay extends BasicOverlay {
 
 	private Layers mDebugLayer;
 	private final static float[] mDebugPoints = new float[4];
+
 	//private final Matrix4 mMVP = new Matrix4();
 
 	//void addTile(MapTile t) {
@@ -313,9 +314,15 @@ public class TextOverlay extends BasicOverlay {
 		// this scales MapPosition to the zoomlevel of mTiles...
 		// TODO create a helper function in MapPosition
 		MapTile[] tiles = mTileSet.tiles;
+
+		//int zoom = tiles[0].zoomLevel;
+
 		int diff = tiles[0].zoomLevel - pos.zoomLevel;
 		float div = FastMath.pow(diff);
-		float scale = pos.scale * div;
+
+		double scale = pos.getZoomScale() * div;
+
+		//float scale = (float)(pos.absScale / (1 << zoom) );
 
 		double angle = Math.toRadians(pos.angle);
 		float cos = (float) Math.cos(angle);
@@ -330,11 +337,17 @@ public class TextOverlay extends BasicOverlay {
 
 		mRelabelCnt++;
 
+		double tileX = (pos.x * (Tile.TILE_SIZE << pos.zoomLevel));
+		double tileY = (pos.y * (Tile.TILE_SIZE << pos.zoomLevel));
+
 		for (l = mPrevLabels; l != null;) {
 
 			// transform screen coordinates to tile coordinates
 			float s = FastMath.pow(l.tile.zoomLevel - pos.zoomLevel);
-			float sscale = pos.scale / s;
+
+			//float sscale = (float)((1 << l.tile.zoomLevel) / pos.absScale);
+
+			float sscale = (float) (pos.getZoomScale() / s);
 
 			if (l.width > l.length * sscale) {
 				//Log.d(TAG, "- scale " + lp + " " + s + " " + sscale + " " + lp.length + " " + lp.width);
@@ -342,8 +355,8 @@ public class TextOverlay extends BasicOverlay {
 				continue;
 			}
 
-			float dx = (float) (l.tile.pixelX - pos.x * s);
+			float dx = (float) (l.tile.tileX * Tile.TILE_SIZE - tileX * s);
-			float dy = (float) (l.tile.pixelY - pos.y * s);
+			float dy = (float) (l.tile.tileY * Tile.TILE_SIZE - tileY * s);
 
 			// flip around date-line
 			if (dx > maxx)
@@ -399,8 +412,8 @@ public class TextOverlay extends BasicOverlay {
 			if (t.state != JobTile.STATE_READY)
 				continue;
 
-			float dx = (float) (t.pixelX - pos.x);
+			float dx = (float) (t.tileX * Tile.TILE_SIZE - tileX);
-			float dy = (float) (t.pixelY - pos.y);
+			float dy = (float) (t.tileY * Tile.TILE_SIZE - tileY);
 
 			// flip around date-line
 			if (dx > maxx)
@@ -422,7 +435,7 @@ public class TextOverlay extends BasicOverlay {
 					continue;
 
 				l.clone(ti);
-				l.move(ti, dx, dy, scale);
+				l.move(ti, dx, dy, (float) scale);
 
 				// set line endpoints relative to view to be able to
 				// check intersections with label from other tiles
@@ -448,7 +461,7 @@ public class TextOverlay extends BasicOverlay {
 					overlaps = checkOverlap(tl, l);
 
 				if (dbg != null)
-					addDebugBox(dbg, l, ti, overlaps, false, scale);
+					addDebugBox(dbg, l, ti, overlaps, false, (float) scale);
 
 				if (overlaps == 0) {
 					tl.addText(l);
@@ -466,8 +479,8 @@ public class TextOverlay extends BasicOverlay {
 			if (t.state != JobTile.STATE_READY)
 				continue;
 
-			float dx = (float) (t.pixelX - pos.x);
+			float dx = (float) (t.tileX * Tile.TILE_SIZE - tileX);
-			float dy = (float) (t.pixelY - pos.y);
+			float dy = (float) (t.tileY * Tile.TILE_SIZE - tileY);
 
 			// flip around date-line
 			if (dx > maxx)
@@ -484,7 +497,7 @@ public class TextOverlay extends BasicOverlay {
 					l = getLabel();
 
 				l.clone(ti);
-				l.move(ti, dx, dy, scale);
+				l.move(ti, dx, dy, (float) scale);
 				if (!nodeIsVisible(l))
 					continue;
 
@@ -678,7 +691,7 @@ public class TextOverlay extends BasicOverlay {
 
 	@Override
 	public synchronized void render(MapPosition pos, Matrices m) {
-		float div = FastMath.pow(mMapPosition.zoomLevel - pos.zoomLevel);
+		//float div = FastMath.pow(mMapPosition.zoomLevel - pos.zoomLevel);
 
 		GLES20.glBindBuffer(GLES20.GL_ARRAY_BUFFER, layers.vbo.id);
 		GLState.test(false, false);
@@ -690,7 +703,10 @@ public class TextOverlay extends BasicOverlay {
 				if (l.type == Layer.POLYGON) {
 					l = PolygonRenderer.draw(pos, l, m, true, false);
 				} else {
-					float scale = pos.scale * div;
+					//float scale = pos.getScale() * div;
+
+					float scale = (float) ((1 << mMapPosition.zoomLevel) / pos.scale);
+
 					l = LineRenderer.draw(layers, l, pos, m, scale, 0);
 				}
 			}
@@ -698,7 +714,8 @@ public class TextOverlay extends BasicOverlay {
 
 		setMatrix(pos, m);
 		for (Layer l = layers.textureLayers; l != null;) {
-			float scale = (mMapPosition.scale / pos.scale) * div;
+			float scale = (float) (mMapPosition.scale / pos.scale);
+			//float scale = (mMapPosition.getScale() / pos.getScale()) * div;
 
 			l = TextureRenderer.draw(l, scale, m);
 		}
@@ -709,14 +726,22 @@ public class TextOverlay extends BasicOverlay {
 	protected void setMatrix(MapPosition curPos, Matrices m) {
 		MapPosition oPos = mMapPosition;
 
-		float div = FastMath.pow(oPos.zoomLevel - curPos.zoomLevel);
+		double tileScale = Tile.TILE_SIZE * curPos.scale;
-		float x = (float) (oPos.x - curPos.x * div);
+		double scale = (curPos.scale / oPos.scale);
-		float y = (float) (oPos.y - curPos.y * div);
 
-		float scale = (curPos.scale / mMapPosition.scale) / div;
+		float x = (float) ((oPos.x - curPos.x) * tileScale);
-		float s = curPos.scale / div;
+		float y = (float) ((oPos.y - curPos.y) * tileScale);
-		m.mvp.setTransScale(x * s, y * s,
+
-				scale / GLRenderer.COORD_SCALE);
+		m.mvp.setTransScale(x, y, (float) (scale / GLRenderer.COORD_SCALE));
+
+		//		float div = FastMath.pow(oPos.zoomLevel - curPos.zoomLevel);
+		//		float x = (float) (oPos.x - curPos.x * div);
+		//		float y = (float) (oPos.y - curPos.y * div);
+		//
+		//		float scale = (curPos.getScale() / oPos.getScale()) / div;
+		//		float s = curPos.getScale() / div;
+		//		m.mvp.setTransScale(x * s, y * s,
+		//				scale / GLRenderer.COORD_SCALE);
 
 		m.mvp.multiplyMM(m.view, m.mvp);
 	}

src/org/oscim/view/Compass.java

@@ -29,7 +29,7 @@ public class Compass {
 				mAngle = event.values[0];
 
 				if (mMapView != null) {
-					mMapView.getMapPosition().setRotation(-mAngle);
+					mMapView.getMapViewPosition().setRotation(-mAngle);
 					mMapView.redrawMap(true);
 				}
 			}
@@ -43,8 +43,8 @@ public class Compass {
 	/* package */float mAngle = 0;
 	/* package */MapView mMapView;
 
-	private SensorManager mSensorManager;
+	private final SensorManager mSensorManager;
-	private Sensor mSensor;
+	private final Sensor mSensor;
 
 	public Compass(MapActivity mapActivity, MapView mapView) {
 		mMapView = mapView;
@@ -61,6 +61,6 @@ public class Compass {
 
 	void disable() {
 		mSensorManager.unregisterListener(mListener);
-		mMapView.getMapPosition().setRotation(0);
+		mMapView.getMapViewPosition().setRotation(0);
 	}
 }

src/org/oscim/view/MapActivity.java

@@ -40,14 +40,15 @@ import android.content.SharedPreferences.Editor;
 public abstract class MapActivity extends Activity {
 	private static final String KEY_LATITUDE = "latitude";
 	private static final String KEY_LONGITUDE = "longitude";
-	private static final String KEY_ZOOM_LEVEL = "zoomLevel";
+	private static final String KEY_MAP_SCALE = "map_scale";
+
 	private static final String PREFERENCES_FILE = "MapActivity";
 	private static final String KEY_THEME = "Theme";
 
 	private static boolean containsMapViewPosition(SharedPreferences sharedPreferences) {
 		return sharedPreferences.contains(KEY_LATITUDE)
 				&& sharedPreferences.contains(KEY_LONGITUDE)
-				&& sharedPreferences.contains(KEY_ZOOM_LEVEL);
+				&& sharedPreferences.contains(KEY_MAP_SCALE);
 	}
 
 	protected MapView mMapView;
@@ -66,14 +67,16 @@ public abstract class MapActivity extends Activity {
 		Editor editor = getSharedPreferences(PREFERENCES_FILE, MODE_PRIVATE).edit();
 		editor.clear();
 
-		// save the map position and zoom level
+		// save the map position
-		MapPosition mapPosition = mMapView.getMapPosition().getMapPosition();
+		MapPosition mapPosition = new MapPosition();
-		if (mapPosition != null) {
+
-			GeoPoint geoPoint = new GeoPoint(mapPosition.lat, mapPosition.lon);
+		mMapView.getMapViewPosition().getMapPosition(mapPosition);
-			editor.putInt(KEY_LATITUDE, geoPoint.latitudeE6);
+
-			editor.putInt(KEY_LONGITUDE, geoPoint.longitudeE6);
+		GeoPoint geoPoint = mapPosition.getGeoPoint();
-			editor.putInt(KEY_ZOOM_LEVEL, mapPosition.zoomLevel);
+
-		}
+		editor.putInt(KEY_LATITUDE, geoPoint.latitudeE6);
+		editor.putInt(KEY_LONGITUDE, geoPoint.longitudeE6);
+		editor.putFloat(KEY_MAP_SCALE, (float)mapPosition.scale);
 
 		editor.putString(KEY_THEME, mMapView.getRenderTheme());
 
@@ -108,12 +111,14 @@ public abstract class MapActivity extends Activity {
 			// get and set the map position and zoom level
 			int latitudeE6 = sharedPreferences.getInt(KEY_LATITUDE, 0);
 			int longitudeE6 = sharedPreferences.getInt(KEY_LONGITUDE, 0);
-			int zoomLevel = sharedPreferences.getInt(KEY_ZOOM_LEVEL, -1);
+			float scale = sharedPreferences.getFloat(KEY_MAP_SCALE, 1);
 
-			GeoPoint geoPoint = new GeoPoint(latitudeE6, longitudeE6);
-			MapPosition mapPosition = new MapPosition(geoPoint, (byte) zoomLevel, 1);
 
-			mMapView.getMapViewPosition().setMapCenter(mapPosition);
+			MapPosition mapPosition = new MapPosition();
+			mapPosition.setPosition(latitudeE6 / 1E6, longitudeE6 / 1E6);
+			mapPosition.setScale(scale);
+
+			mMapView.getMapViewPosition().setMapPosition(mapPosition);
 		}
 
 		String theme = sharedPreferences.getString(KEY_THEME,

src/org/oscim/view/MapScaleBar.java

@@ -18,7 +18,6 @@ import java.util.HashMap;
 import java.util.Map;
 
 import org.oscim.core.MapPosition;
-import org.oscim.core.MercatorProjection;
 
 import android.graphics.Bitmap;
 import android.graphics.Canvas;
@@ -173,17 +172,17 @@ public class MapScaleBar {
 			return true;
 		}
 
-		MapPosition currentMapPosition = mMapView.getMapPosition().getMapPosition();
+//		MapPosition mapPosition = mMapView.getMapPosition().getMapPosition();
+//
+//		if (mapPosition.zoomLevel != mMapPosition.zoomLevel) {
+//			return true;
+//		}
 
-		if (currentMapPosition.zoomLevel != mMapPosition.zoomLevel) {
+//		double latitudeDiff = Math.abs(mapPosition.lat
-			return true;
+//				- mMapPosition.lat);
-		}
+//		if (latitudeDiff > LATITUDE_REDRAW_THRESHOLD) {
-
+//			return true;
-		double latitudeDiff = Math.abs(currentMapPosition.lat
+//		}
-				- mMapPosition.lat);
-		if (latitudeDiff > LATITUDE_REDRAW_THRESHOLD) {
-			return true;
-		}
 
 		return false;
 	}
@@ -250,31 +249,31 @@ public class MapScaleBar {
 			return;
 		}
 
-		mMapPosition = mMapView.getMapPosition().getMapPosition();
+//		mMapPosition = mMapView.getMapPosition().getMapPosition();
-		double groundResolution = MercatorProjection.calculateGroundResolution(
+//		double groundResolution = MercatorProjection.calculateGroundResolution(
-				mMapPosition.lat,
+//				mMapPosition.lat,
-				mMapPosition.zoomLevel);
+//				mMapPosition.zoomLevel);
-
+//
-		int[] scaleBarValues;
+//		int[] scaleBarValues;
-		if (mImperialUnits) {
+//		if (mImperialUnits) {
-			groundResolution = groundResolution / METER_FOOT_RATIO;
+//			groundResolution = groundResolution / METER_FOOT_RATIO;
-			scaleBarValues = SCALE_BAR_VALUES_IMPERIAL;
+//			scaleBarValues = SCALE_BAR_VALUES_IMPERIAL;
-		} else {
+//		} else {
-			scaleBarValues = SCALE_BAR_VALUES_METRIC;
+//			scaleBarValues = SCALE_BAR_VALUES_METRIC;
-		}
+//		}
-
+//
-		float scaleBarLength = 0;
+//		float scaleBarLength = 0;
-		int mapScaleValue = 0;
+//		int mapScaleValue = 0;
-
+//
-		for (int i = 0; i < scaleBarValues.length; ++i) {
+//		for (int i = 0; i < scaleBarValues.length; ++i) {
-			mapScaleValue = scaleBarValues[i];
+//			mapScaleValue = scaleBarValues[i];
-			scaleBarLength = mapScaleValue / (float) groundResolution;
+//			scaleBarLength = mapScaleValue / (float) groundResolution;
-			if (scaleBarLength < (BITMAP_WIDTH - 10)) {
+//			if (scaleBarLength < (BITMAP_WIDTH - 10)) {
-				break;
+//				break;
-			}
+//			}
-		}
+//		}
-
+//
-		redrawMapScaleBitmap(scaleBarLength, mapScaleValue);
+//		redrawMapScaleBitmap(scaleBarLength, mapScaleValue);
 		mRedrawNeeded = false;
 	}
 }

src/org/oscim/view/MapView.java

@@ -39,7 +39,6 @@ import org.oscim.generator.MapWorker;
 import org.oscim.generator.TileGenerator;
 import org.oscim.overlay.BuildingOverlay;
 import org.oscim.overlay.LabelingOverlay;
-import org.oscim.overlay.MapLensOverlay;
 import org.oscim.overlay.Overlay;
 import org.oscim.overlay.OverlayManager;
 import org.oscim.renderer.GLRenderer;
@@ -175,11 +174,6 @@ public class MapView extends RelativeLayout {
 
 		mapActivity.registerMapView(this);
 
-		if (!mMapViewPosition.isValid()) {
-			Log.d(TAG, "set default start position");
-			setMapCenter(new MapPosition(new GeoPoint(0, 0), (byte) 2, 1));
-		}
-
 		LayoutParams params = new LayoutParams(
 				android.view.ViewGroup.LayoutParams.MATCH_PARENT,
 				android.view.ViewGroup.LayoutParams.MATCH_PARENT);
@@ -191,20 +185,63 @@ public class MapView extends RelativeLayout {
 		mRotationEnabled = true;
 
 		//mOverlayManager.add(new GenericOverlay(this, new GridOverlay(this)));
-		mOverlayManager.add(new BuildingOverlay(this));
 
+		mOverlayManager.add(new BuildingOverlay(this));
 		mOverlayManager.add(new LabelingOverlay(this));
 
-
 		//mOverlayManager.add(new GenericOverlay(this, new TileOverlay(this)));
-		mOverlayManager.add(new MapLensOverlay(this));
-
 		//mOverlayManager.add(new GenericOverlay(this, new CustomOverlay(this)));
+		//mOverlayManager.add(new MapLensOverlay(this));
 
-		//		if (testRegionZoom)
-		//			mRegionLookup = new RegionLookup(this);
 		clearMap();
+	}
 
+	void destroy() {
+		mTileManager.destroy();
+
+		for (MapWorker mapWorker : mMapWorkers) {
+			mapWorker.pause();
+			mapWorker.interrupt();
+
+			mapWorker.getTileGenerator().getMapDatabase().close();
+
+			try {
+				mapWorker.join(10000);
+			} catch (InterruptedException e) {
+				// restore the interrupted status
+				Thread.currentThread().interrupt();
+			}
+
+		}
+	}
+
+	private boolean mPausing = false;
+
+	void onPause() {
+		mPausing = true;
+
+		Log.d(TAG, "onPause");
+		mJobQueue.clear();
+		mapWorkersPause(true);
+
+		if (this.mCompassEnabled)
+			mCompass.disable();
+
+	}
+
+	void onResume() {
+		Log.d(TAG, "onResume");
+		mapWorkersProceed();
+
+		if (this.mCompassEnabled)
+			mCompass.enable();
+
+		mPausing = false;
+	}
+
+	public void onStop() {
+		Log.d(TAG, "onStop");
+		//mTileManager.destroy();
 	}
 
 	@Override
@@ -243,13 +280,6 @@ public class MapView extends RelativeLayout {
 			mGLView.requestRender();
 	}
 
-	/**
-	 * @return the current position and zoom level of this MapView.
-	 */
-	public MapViewPosition getMapPosition() {
-		return mMapViewPosition;
-	}
-
 	public void enableRotation(boolean enable) {
 		mRotationEnabled = enable;
 
@@ -356,10 +386,19 @@ public class MapView extends RelativeLayout {
 		if (startPos == null)
 			startPos = new GeoPoint(0, 0);
 
-		if (mapInfo.startZoomLevel != null)
+		MapPosition mapPosition = new MapPosition();
-			return new MapPosition(startPos, (mapInfo.startZoomLevel).byteValue(), 1);
+		mapPosition.setPosition(startPos);
 
-		return new MapPosition(startPos, (byte) 12, 1);
+		if (mapInfo.startZoomLevel == null)
+			mapPosition.setZoomLevel(12);
+		else
+			mapPosition.setZoomLevel((mapInfo.startZoomLevel).byteValue());
+
+		return mapPosition;
+	}
+
+	public void setMapPosition(MapPosition mapPosition) {
+		mMapViewPosition.setMapPosition(mapPosition);
 	}
 
 	/**
@@ -505,95 +544,6 @@ public class MapView extends RelativeLayout {
 		return false;
 	}
 
-	void destroy() {
-		for (MapWorker mapWorker : mMapWorkers) {
-			mapWorker.pause();
-			mapWorker.interrupt();
-
-			mapWorker.getTileGenerator().getMapDatabase().close();
-
-			try {
-				mapWorker.join(10000);
-			} catch (InterruptedException e) {
-				// restore the interrupted status
-				Thread.currentThread().interrupt();
-			}
-
-		}
-	}
-
-	private boolean mPausing = false;
-
-	void onPause() {
-		mPausing = true;
-
-		Log.d(TAG, "onPause");
-		mJobQueue.clear();
-		mapWorkersPause(true);
-
-		if (this.mCompassEnabled)
-			mCompass.disable();
-
-	}
-
-	void onResume() {
-		Log.d(TAG, "onResume");
-		mapWorkersProceed();
-
-		if (this.mCompassEnabled)
-			mCompass.enable();
-
-		mPausing = false;
-	}
-
-	public void onStop() {
-		Log.d(TAG, "onStop");
-		mTileManager.destroy();
-	}
-
-	/**
-	 * @return the maximum possible zoom level.
-	 */
-	byte getMaximumPossibleZoomLevel() {
-		return (byte) MapViewPosition.MAX_ZOOMLEVEL;
-		// Math.min(mMapZoomControls.getZoomLevelMax(),
-		// mMapGenerator.getZoomLevelMax());
-	}
-
-	/**
-	 * @return true if the current center position of this MapView is valid,
-	 *         false otherwise.
-	 */
-	boolean hasValidCenter() {
-		MapInfo mapInfo;
-
-		if (!mMapViewPosition.isValid())
-			return false;
-
-		if ((mapInfo = mMapDatabase.getMapInfo()) == null)
-			return false;
-
-		if (!mapInfo.boundingBox.contains(getMapPosition().getMapCenter()))
-			return false;
-
-		return true;
-	}
-
-	/**
-	 * Sets the center and zoom level of this MapView and triggers a redraw.
-	 *
-	 * @param mapPosition
-	 *            the new map position of this MapView.
-	 */
-	public void setMapCenter(MapPosition mapPosition) {
-		Log.d(TAG, "setMapCenter "
-				+ " lat: " + mapPosition.lat
-				+ " lon: " + mapPosition.lon);
-
-		mMapViewPosition.setMapCenter(mapPosition);
-		redrawMap(true);
-	}
-
 	/**
 	 * Sets the center of the MapView and triggers a redraw.
 	 *
@@ -607,7 +557,7 @@ public class MapView extends RelativeLayout {
 	}
 
 	/**
-	 * @return MapPosition
+	 * @return MapViewPosition
 	 */
 	public MapViewPosition getMapViewPosition() {
 		return mMapViewPosition;
@@ -671,11 +621,10 @@ public class MapView extends RelativeLayout {
 		return mTileManager;
 	}
 
+	/**
+	 * @return estimated visible axis aligned bounding box
+	 */
 	public BoundingBox getBoundingBox() {
 		return mMapViewPosition.getViewBox();
 	}
-
-	public GeoPoint getCenter() {
-		return new GeoPoint(mMapPosition.lat, mMapPosition.lon);
-	}
 }

src/org/oscim/view/MapViewPosition.java

@@ -34,30 +34,22 @@ import android.os.SystemClock;
 import android.util.Log;
 import android.view.animation.AccelerateDecelerateInterpolator;
 
-/**
- * A MapPosition stores the latitude and longitude coordinate of a MapView
- * together with its zoom level, rotation and tilt
- */
-
 public class MapViewPosition {
 	private static final String TAG = MapViewPosition.class.getName();
 
-	public final static int MAX_ZOOMLEVEL = 17;
+	// needs to fit for int: 2 * 20 * Tile.TILE_SIZE
+	public final static int MAX_ZOOMLEVEL = 20;
 	public final static int MIN_ZOOMLEVEL = 2;
-	public final static int MAX_END_SCALE = 8;
+
-	public final static double MAX_SCALE = ((1 << MAX_ZOOMLEVEL) * MAX_END_SCALE);
+	public final static double MAX_SCALE = (1 << MAX_ZOOMLEVEL);
 	public final static double MIN_SCALE = (1 << MIN_ZOOMLEVEL);
 
-	// needs to fit for int: 2 * 20 * Tile.TILE_SIZE
 	public final static int ABS_ZOOMLEVEL = 20;
 
 	private final static float MAX_ANGLE = 65;
 
 	private final MapView mMapView;
 
-	private double mLatitude;
-	private double mLongitude;
-
 	private double mAbsScale;
 	private double mAbsX;
 	private double mAbsY;
@@ -73,20 +65,7 @@ public class MapViewPosition {
 	private double mCurY;
 
 	private float mRotation;
-	public float mTilt;
+	private float mTilt;
-
-	private final AnimationHandler mHandler;
-
-	MapViewPosition(MapView mapView) {
-		mMapView = mapView;
-		mLatitude = Double.NaN;
-		mLongitude = Double.NaN;
-		mRotation = 0.0f;
-		mTilt = 0;
-		mAbsScale = 1;
-
-		mHandler = new AnimationHandler(this);
-	}
 
 	private final Matrix4 mProjMatrix = new Matrix4();
 	private final Matrix4 mProjMatrixI = new Matrix4();
@@ -110,6 +89,29 @@ public class MapViewPosition {
 	// scale map plane at VIEW_DISTANCE to near plane
 	public final static float VIEW_SCALE = (VIEW_NEAR / VIEW_DISTANCE) * 0.5f;
 
+	private final AnimationHandler mHandler;
+
+	MapViewPosition(MapView mapView) {
+		mMapView = mapView;
+
+		mAbsScale = 4;
+		mAbsX = 0.5;
+		mAbsY = 0.5;
+
+		mRotation = 0;
+		mTilt = 0;
+
+		updatePosition();
+
+		mHandler = new AnimationHandler(this);
+	}
+
+	private void updatePosition() {
+		mCurScale = mAbsScale * Tile.TILE_SIZE;
+		mCurX = mAbsX * mCurScale;
+		mCurY = mAbsY * mCurScale;
+	}
+
 	void setViewport(int width, int height) {
 		float s = VIEW_SCALE;
 		float aspect = height / (float) width;
@@ -141,34 +143,27 @@ public class MapViewPosition {
 	public synchronized boolean getMapPosition(MapPosition pos) {
 
 		int z = FastMath.log2((int) mAbsScale);
-		z = FastMath.clamp(z, MIN_ZOOMLEVEL, MAX_ZOOMLEVEL);
+		//z = FastMath.clamp(z, MIN_ZOOMLEVEL, MAX_ZOOMLEVEL);
-		float scale = (float) (mAbsScale / (1 << z));
+		//float scale = (float) (mAbsScale / (1 << z));
 
-		if (pos.lat == mLatitude
+		boolean changed = (pos.zoomLevel != z
-				&& pos.lon == mLongitude
+				|| pos.x != mAbsX
-				&& pos.zoomLevel == z
+				|| pos.y != mAbsY
-				&& pos.scale == scale
+				|| pos.scale != mAbsScale
-				&& pos.angle == mRotation
+				|| pos.angle != mRotation
-				&& pos.tilt == mTilt)
+				|| pos.tilt != mTilt);
-			return false;
 
-		pos.lat = mLatitude;
-		pos.lon = mLongitude;
 		pos.angle = mRotation;
 		pos.tilt = mTilt;
 
-		pos.absX = mAbsX;
+		pos.x = mAbsX;
-		pos.absY = mAbsY;
+		pos.y = mAbsY;
-		pos.absScale = mAbsScale;
+		pos.scale = mAbsScale;
 
 		// for tiling
-		pos.scale = scale;
+		pos.zoomLevel = z;
-		pos.zoomLevel = (byte) z;
 
-		pos.x = mAbsX * (Tile.TILE_SIZE << z);
+		return changed;
-		pos.y = mAbsY * (Tile.TILE_SIZE << z);
-
-		return true;
 	}
 
 	/**
@@ -250,23 +245,8 @@ public class MapViewPosition {
 
 	/** @return the current center point of the MapView. */
 	public synchronized GeoPoint getMapCenter() {
-		return new GeoPoint(mLatitude, mLongitude);
+		return new GeoPoint(MercatorProjection.toLatitude(mAbsY),
-	}
+				MercatorProjection.toLongitude(mAbsX));
-
-	/**
-	 * @return a MapPosition or null, if this map position is not valid.
-	 * @see #isValid()
-	 */
-	public synchronized MapPosition getMapPosition() {
-		if (!isValid()) {
-			return null;
-		}
-
-		int z = FastMath.log2((int) mAbsScale);
-		z = FastMath.clamp(z, MIN_ZOOMLEVEL, MAX_ZOOMLEVEL);
-		float scale = (float) (mAbsScale / (1 << z));
-
-		return new MapPosition(mLatitude, mLongitude, (byte) z, scale, mRotation);
 	}
 
 	/**
@@ -303,10 +283,10 @@ public class MapViewPosition {
 			maxY = Math.max(maxY, dy);
 		}
 
-		minX = MercatorProjection.toLongitude(minX, mCurScale);
+		minX = MercatorProjection.toLongitude(minX / mCurScale);
-		maxX = MercatorProjection.toLongitude(maxX, mCurScale);
+		maxX = MercatorProjection.toLongitude(maxX / mCurScale);
-		minY = MercatorProjection.toLatitude(minY, mCurScale);
+		minY = MercatorProjection.toLatitude(minY / mCurScale);
-		maxY = MercatorProjection.toLatitude(maxY, mCurScale);
+		maxY = MercatorProjection.toLatitude(maxY / mCurScale);
 
 		// yea, this is upside down..
 		BoundingBox bbox = new BoundingBox(maxY, minX, minY, maxX);
@@ -446,27 +426,6 @@ public class MapViewPosition {
 		mUnprojMatrix.multiplyMM(mTmpMatrix, mProjMatrixI);
 	}
 
-	/** @return true if this MapViewPosition is valid, false otherwise. */
-	public synchronized boolean isValid() {
-		if (Double.isNaN(mLatitude)) {
-			return false;
-		} else if (mLatitude < MercatorProjection.LATITUDE_MIN) {
-			return false;
-		} else if (mLatitude > MercatorProjection.LATITUDE_MAX) {
-			return false;
-		}
-
-		if (Double.isNaN(mLongitude)) {
-			return false;
-		} else if (mLongitude < MercatorProjection.LONGITUDE_MIN) {
-			return false;
-		} else if (mLongitude > MercatorProjection.LONGITUDE_MAX) {
-			return false;
-		}
-
-		return true;
-	}
-
 	/**
 	 * Moves this MapViewPosition by the given amount of pixels.
 	 *
@@ -495,9 +454,6 @@ public class MapViewPosition {
 		while (mAbsX < 0)
 			mAbsX += 1;
 
-		mLongitude = MercatorProjection.toLongitude(mAbsX);
-		mLatitude = MercatorProjection.toLatitude(mAbsY);
-
 		updatePosition();
 	}
 
@@ -516,9 +472,6 @@ public class MapViewPosition {
 		while (mAbsX < 0)
 			mAbsX += 1;
 
-		mLongitude = MercatorProjection.toLongitude(mAbsX);
-		mLatitude = MercatorProjection.toLatitude(mAbsY);
-
 		updatePosition();
 	}
 
@@ -615,25 +568,26 @@ public class MapViewPosition {
 		updateMatrix();
 	}
 
+	public synchronized float getTilt() {
+		return mTilt;
+	}
+
 	private void setMapCenter(double latitude, double longitude) {
-		mLatitude = MercatorProjection.limitLatitude(latitude);
+		latitude = MercatorProjection.limitLatitude(latitude);
-		mLongitude = MercatorProjection.limitLongitude(longitude);
+		longitude = MercatorProjection.limitLongitude(longitude);
-		mAbsX = MercatorProjection.longitudeToX(mLongitude);
+		mAbsX = MercatorProjection.longitudeToX(longitude);
-		mAbsY = MercatorProjection.latitudeToY(mLatitude);
+		mAbsY = MercatorProjection.latitudeToY(latitude);
+	}
+
+	 synchronized void setMapPosition(MapPosition mapPosition) {
+		setZoomLevelLimit(mapPosition.zoomLevel);
+		mAbsX = mapPosition.x;
+		mAbsY = mapPosition.y;
 		updatePosition();
 	}
 
 	synchronized void setMapCenter(GeoPoint geoPoint) {
 		setMapCenter(geoPoint.getLatitude(), geoPoint.getLongitude());
-	}
-
-	synchronized void setMapCenter(MapPosition mapPosition) {
-		setZoomLevelLimit(mapPosition.zoomLevel);
-		setMapCenter(mapPosition.lat, mapPosition.lon);
-	}
-
-	synchronized void setZoomLevel(byte zoomLevel) {
-		setZoomLevelLimit(zoomLevel);
 		updatePosition();
 	}
 
@@ -641,13 +595,6 @@ public class MapViewPosition {
 		mAbsScale = FastMath.clamp(1 << zoomLevel, MIN_SCALE, MAX_SCALE);
 	}
 
-	private void updatePosition() {
-		mCurScale = mAbsScale * Tile.TILE_SIZE;
-
-		mCurX = mAbsX * mCurScale;
-		mCurY = mAbsY * mCurScale;
-	}
-
 	/************************************************************************/
 	// TODO move to MapAnimator:
 

src/org/oscim/view/TouchHandler.java

@@ -78,7 +78,7 @@ final class TouchHandler implements OnGestureListener, OnDoubleTapListener {
 	 */
 	public TouchHandler(Context context, MapView mapView) {
 		mMapView = mapView;
-		mMapPosition = mapView.getMapPosition();
+		mMapPosition = mapView.getMapViewPosition();
 		mOverlayManager = mapView.getOverlayManager();
 		mGestureDetector = new GestureDetector(context, this);
 		mGestureDetector.setOnDoubleTapListener(this);