xbzbarray.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.array;

import java.util.Vector;
import java.util.Hashtable;
import net.aetherial.gis.jiaotongbu.outputJTB.txtOutput.module.gpsdata.lxld.lx.XiangzhenZB;
/**
 * <p>Title: </p>
 *
 * <p>Description: </p>
 *
 * <p>Copyright: Copyright (c) 2004</p>
 *
 * <p>Company: </p>
 *
 * @author not attributable
 * @version 1.0
 */
public class XBZBArray {
  private static Vector xz = new Vector();
  private static XiangzhenZB[] xzzb = null;
  public XBZBArray() {
  }

  public static void addXZZB(XiangzhenZB newZB){
    xz.addElement(newZB);
    refreshXZZB();
  }

  private static void refreshXZZB(){
    xzzb = new XiangzhenZB[xz.size()];
    for (int i = 0; i < xzzb.length; i++) {
      xzzb[i] = (XiangzhenZB)xz.elementAt(i);
    }
  }

  public static String getNearstXiangzhen(double lon,double lat){
    Hashtable ht = new Hashtable();
    double minDis = 1000;
    double dis;
    for (int i = 0; xzzb != null && i < xzzb.length; i++) {
      dis = Math.pow((xzzb[i].getLongittude() - lon)*(xzzb[i].getLongittude() - lon) + (xzzb[i].getLatitude() - lat)*(xzzb[i].getLatitude() - lat),0.5);
      ht.put(new Double(dis),xzzb[i]);
      minDis = Math.min(minDis,dis);
    }
    return ((XiangzhenZB)ht.get(new Double(minDis))).getBianma();
  }

  public static void reset(){
    xz = new Vector();
  }
}