Android Open Source - geoar-app Tile

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License

The source code is released under:

Apache License

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Java Source Code

/**
 * Copyright 2012 52North Initiative for Geospatial Open Source Software GmbH
 */*w  w w  .j a  va  2  s.  co  m*/
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.n52.geoar.newdata;

import org.n52.geoar.alg.proj.MercatorProj;
import org.n52.geoar.alg.proj.MercatorRect;
import org.n52.geoar.utils.GeoLocationRect;

import com.vividsolutions.jts.geom.Envelope;

import android.graphics.RectF;

/**
 * A tile in the spatial index, based on {@link MercatorProj}
 * 
 * @author Holger Hopmann
 * 
 */
public class Tile {

  public int x;
  public int y;
  public byte zoom;

  public Tile(int x, int y, byte zoom) {
    this.x = x;
    this.y = y;
    this.zoom = zoom;
  }

  @Override
  public int hashCode() {
    return x ^ y ^ zoom;
  }

  /**
   * Gets Lon Lat Bounding Box from that tile
   * 
   * @return
   */
  public RectF getLLBBox() {
    RectF bb = new RectF();
    bb.top = (float) MercatorProj.transformTileYToLat(y, zoom);
    bb.bottom = (float) MercatorProj.transformTileYToLat(y + 1, zoom);
    bb.left = (float) MercatorProj.transformTileXToLon(x, zoom);
    bb.right = (float) MercatorProj.transformTileXToLon(x + 1, zoom);
    return bb;
  }

  public GeoLocationRect getGeoLocationRect() {
    float top = (float) MercatorProj.transformTileYToLat(y, zoom);
    float bottom = (float) MercatorProj.transformTileYToLat(y + 1, zoom);
    float left = (float) MercatorProj.transformTileXToLon(x, zoom);
    float right = (float) MercatorProj.transformTileXToLon(x + 1, zoom);
    return new GeoLocationRect(left, top, right, bottom);
  }

  public MercatorRect getMercatorRect() {
    return new MercatorRect(MercatorProj.transformTileXToPixelX(x),
        MercatorProj.transformTileYToPixelY(y),
        MercatorProj.transformTileXToPixelX(x + 1),
        MercatorProj.transformTileYToPixelY(y + 1), zoom);
  }

  public Envelope getEnvelope() {
    float top = (float) MercatorProj.transformTileYToLat(y, zoom);
    float bottom = (float) MercatorProj.transformTileYToLat(y + 1, zoom);
    float left = (float) MercatorProj.transformTileXToLon(x, zoom);
    float right = (float) MercatorProj.transformTileXToLon(x + 1, zoom);
    return new Envelope(left, right, top, bottom);
  }

  @Override
  public boolean equals(Object o) {
    if (o instanceof Tile) {
      Tile another = (Tile) o;
      return x == another.x && y == another.y && zoom == another.zoom;
    } else {
      return false;
    }
  }

}

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