TileCoordinate.java :  » App » mapsforge » org » mapsforge » preprocessing » map » osmosis » Android Open Source

/*
 * Copyright 2010, 2011 mapsforge.org
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.mapsforge.preprocessing.map.osmosis;

import java.util.ArrayList;
import java.util.List;

class TileCoordinate {

  private final int x;
  private final int y;
  private final byte zoomlevel;

  public TileCoordinate(int x, int y, byte zoomlevel) {
    super();
    this.x = x;
    this.y = y;
    this.zoomlevel = zoomlevel;
  }

  int getX() {
    return x;
  }

  int getY() {
    return y;
  }

  byte getZoomlevel() {
    return zoomlevel;
  }

  List<TileCoordinate> translateToZoomLevel(byte zoomlevelNew) {
    List<TileCoordinate> tiles = null;
    int zoomlevelDistance = zoomlevelNew - this.zoomlevel;

    int factor = (int) Math.pow(2, Math.abs(zoomlevelDistance));
    if (zoomlevelDistance > 0) {
      tiles = new ArrayList<TileCoordinate>(
          (int) Math.pow(4, Math.abs(zoomlevelDistance)));
      int tileUpperLeftX = this.x * factor;
      int tileUpperLeftY = this.y * factor;
      for (int i = 0; i < factor; i++) {
        for (int j = 0; j < factor; j++) {
          tiles.add(new TileCoordinate(tileUpperLeftX + j, tileUpperLeftY + i,
              zoomlevelNew));
        }
      }

    } else {
      tiles = new ArrayList<TileCoordinate>(1);
      tiles.add(new TileCoordinate(this.x / factor, this.y / factor, zoomlevelNew));
    }
    return tiles;
  }

  @Override
  public int hashCode() {
    final int prime = 31;
    int result = 1;
    result = prime * result + x;
    result = prime * result + y;
    result = prime * result + zoomlevel;
    return result;
  }

  @Override
  public boolean equals(Object obj) {
    if (this == obj)
      return true;
    if (obj == null)
      return false;
    if (getClass() != obj.getClass())
      return false;
    TileCoordinate other = (TileCoordinate) obj;
    if (x != other.x)
      return false;
    if (y != other.y)
      return false;
    if (zoomlevel != other.zoomlevel)
      return false;
    return true;
  }

  @Override
  public String toString() {
    return "TileCoordinate [x=" + x + ", y=" + y + ", zoomlevel=" + zoomlevel + "]";
  }

}