newbjtrack.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.jiaotongbu.outputJTB.txtOutput.module.gpsdata.lxld.ld.
    ldhf.bianjie;

import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import net.aetherial.gis.surface.ItemValue;
import java.util.*;
import net.aetherial.gis.jiaotongbu.outputJTB.txtOutput.module.gpsdata.lxld.ld.ldhf.TrackToLD;
import net.aetherial.gis.jiaotongbu.outputJTB.txtOutput.module.colligate.xzjj.XZJJData;
/**
 * <p>Title: </p>
 *
 * <p>Description: </p>
 *
 * <p>Copyright: Copyright (c) 2004</p>
 *
 * <p>Company: </p>
 *
 * @author not attributable
 * @version 1.0
 */
public class NewBJTrack {
  public NewBJTrack() {
  }

  /**
   * 用给定的XZJJData[]产生新的航迹
   */
  public void createNewTrack(XZJJData[] jj){
    if (jj == null) {
      return;
    }
    String nearTrk = null;
    Node nearTp = null;
    for (int i = 0; i < jj.length; i++) {
      nearTrk = jj[i].getNearstTracks();
      nearTp = this.getNearstTP(nearTrk,Double.parseDouble(jj[i].getColumnLongitude()),Double.parseDouble(jj[i].getColumnLatitude()));
//      TrackToLD.cutByTrackPoint(nearTrk,nearTp);
    }

  }

  /**
   * 得到最近的航迹点
   */
  private Node getNearstTP(String trk,double longitude,double latitude){
    if (trk == null) {
      return null;
    }
    Node tp = null;
    Vector nodes = (Vector) ItemValue.namedTracks.get(trk);
    double dis = 9999999d;
    for(int n=0 ; nodes != null && n < nodes.size(); n++){
      Node node = (Node) nodes.get(n);
      NodeList nl = ItemValue.getTracksPoint(node);
       double minDis = 1000.0;

      for (int i = 0; i < nl.getLength(); i++) {
        minDis = this.getDisOfTP(nl.item(i), longitude, latitude);
        if(minDis < dis){
          dis = minDis;
          tp = nl.item(i);
        }

      }
    }
    return tp;
  }

  /**
   * 得到给定的坐标与航迹点的距离
   */
  private double getDisOfTP(Node tp,double lon,double lat){
    double tpx = Double.parseDouble(ItemValue.getTracksPointX(tp));
    double tpy = Double.parseDouble(ItemValue.getTracksPointY(tp));
    return Math.pow((tpx - lon) * (tpx - lon) + (tpy - lat) * (tpy - lat),0.5);
  }
}