Custom map source for local area

Following is an advanced example custom map service. "Regio" maps are for local area, so calculation of tile x and y has to be overwritten. This example uses also local custom projection (EPSG:3301), but you can base your map to a built-in projection (like Google Mercator EPSG3785). The map bonds (constants MIN_E etc) must be defined in the map's projection.

Note that library does not prevents user to move outside map bounds, application has to control it (using MapListener and MapMoved events, for example).

The example is just to get some ideas how to solve it, it is not directly usable.

public class Regio extends EPSG3301 implements 
  GeoMap, UnstreamedMap {

  public static final int TILE_EDGE_PX = 256;
  public static final int MIN_E = -211000; 
  public static final int MIN_N = 5732000; 
  public static final int MAX_E = 1325000; 
  public static final int MAX_N = 7268000; 
  public static final int MIN_ZOOM = 2;
  public static final int MAX_ZOOM = 12;
  public static final int MAP_WIDTH_HEIGHT_METERS = MAX_E - MIN_E;

  private final String baseurl;


  public Regio(final String baseurl) {
    super(new StringCopyright("Regio"), 256, 
      MIN_ZOOM, MAX_ZOOM);
    this.baseurl = baseurl;
  }

  public Point mapPosToWgs(final MapPos pos) {
    return toWgs(mapPointToEastingNorthing(pos, pos.getZoom()));
  }

  private Point mapPointToEastingNorthing(final MapPos pos, final int zoom) {
    final int mapWidthHeightInPixels = getMapWidth(zoom);
    final float pixelInMeters = MAP_WIDTH_HEIGHT_METERS / (float) mapWidthHeightInPixels;
    final int easting = (int) (pos.getX() * pixelInMeters + MIN_E);
    final int northing = (int) (MAX_N - pos.getY() * pixelInMeters);
    return new Point(easting, northing);
  }

  public MapPos wgsToMapPos(final Point wgs, final int zoom) {
    //calculate easting/northing
    final Point enPoint = fromWgs(wgs);
    final int eastingFromMapZero = enPoint.getX() - MIN_E;
    final int northingFromMapZero = enPoint.getY() - MIN_N;

    final int mapWidthHeightInPixels = getMapWidth(zoom);
    final int pointX = (int) ((eastingFromMapZero / (float) MAP_WIDTH_HEIGHT_METERS) * mapWidthHeightInPixels);
    final int pointY = (int) (mapWidthHeightInPixels - ((northingFromMapZero / (float) MAP_WIDTH_HEIGHT_METERS) * mapWidthHeightInPixels));
    return new MapPos(pointX, pointY, zoom);
  }

  public String buildPath(final int mapX, final int mapY, final int zoom) {
    final int x = mapX / TILE_EDGE_PX;
    final int y = mapY / TILE_EDGE_PX;
    return getTileUrl(x, y, zoom);
  }

  private String getTileUrl(final int x, final int y, final int zoom) {
    final StringBuffer url = new StringBuffer(baseurl);
    url.append("tile=");
	// generate quad-key for xy
    for (int i = zoom - 1; i >= 0; i--) {
      url.append((((y >> i) & 1) << 1) + ((x >> i) & 1));
    }

    return url.toString();
  }
}