public List<TileDirectory> tilesInRegion(float n,float s,float e,float w){
  if (containedTiles == null) {
    return null;
  }
  List<TileDirectory> retval=new ArrayList<TileDirectory>();
  int numTiles=containedTiles.length;
  for (int i=0; i < numTiles; i++) {
    TileDirectory tile=containedTiles[i];
    if (tile != null && tile.inRegion(n,s,e,w)) {
      retval.add(tile);
    }
  }
  return retval;
}

public List < TileDirectory > tilesInRegion ( float n , float s , float e , float w ) { if ( containedTiles == null ) { return null ; } List < TileDirectory > retval = new ArrayList < TileDirectory > ( ) ; int numTiles = containedTiles . length ; for ( int i = 0 ; i < numTiles ; i ++ ) { TileDirectory tile = containedTiles [ i ] ; if ( tile != null && tile . inRegion ( n , s , e , w ) ) { retval . add ( tile ) ; } } return retval ; }
get a list of tiles in the bounding region
