contrkoper.java

基于Java的地图数据管理软件。使用MySQL数据库管理系统。

package net.aetherial.gis.publicuse.track;

import org.w3c.dom.Node;
import net.aetherial.gis.surface.ItemValue;
/**
 * <p>Title: </p>
 *
 * <p>Description: </p>
 *
 * <p>Copyright: Copyright (c) 2004</p>
 *
 * <p>Company: </p>
 *
 * @author not attributable
 * @version 1.0
 */
public class ConTrkOper {
  public static double getConTrksDis(ConcatenatedTrack A,ConcatenatedTrack B) {
    Node a1 = A.getFirstTrackPoint();
    Node a2 = A.getFirstTrackPoint();
    Node b1 = B.getFirstTrackPoint();
    Node b2 = B.getFirstTrackPoint();
    try {
      return Math.min(getDisOfTp(a1, b1),
                      Math.min(getDisOfTp(a1, b2),
                               Math.min(getDisOfTp(a2, b1), getDisOfTp(a2, b2))));
    }
    catch (Exception ex) {
      return Double.MAX_VALUE;
    }
  }

  private static double getDisOfTp(Node trackpoint1, Node trackpoint2) throws
      Exception {
    double wpt_x = Double.parseDouble(ItemValue.getTracksPointX(trackpoint1));
    double wpt_y = Double.parseDouble(ItemValue.getTracksPointY(trackpoint1));
    double tp_x = Double.parseDouble(ItemValue.getTracksPointX(trackpoint2));
    double tp_y = Double.parseDouble(ItemValue.getTracksPointY(trackpoint2));
    return Math.sqrt( (wpt_x - tp_x) * (wpt_x - tp_x) +
                     (wpt_y - tp_y) * (wpt_y - tp_y));
  }




}