tracktablename.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.table;

import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import net.aetherial.gis.surface.ItemValue;

/**
 * <p>Title: </p>
 *
 * <p>Description: 航迹的名称构造成起乾点命名,如果找不到最近的起乾点,则以原路名命名</p>
 *
 * <p>Copyright: Copyright (c) 2004</p>
 *
 * <p>Company: </p>
 *
 * @author not attributable
 * @version 1.0
 */
public class TrackTableName {
  /**
   * 10M
   */
  private final double NEAR_DISTANCE = 0.0006;
  private String primalName = "";
  private String chengeName = "";
  private Node trk = null;
  private Node[] hiswpt = null;
  private NodeList tpoint = null;
  public TrackTableName(Node trk) {
    this.trk = trk;
    String code = ItemValue.getTracksNumber(trk);

    this.primalName = ItemValue.getTracksName(trk);
    this.primalName = primalName.replaceAll("（","(").replaceAll("）",")");
    if(primalName.lastIndexOf("(") > -1
       && primalName.lastIndexOf(")") > -1
       && primalName.lastIndexOf("(") < primalName.lastIndexOf(")")){
      this.primalName = this.primalName.substring(primalName.lastIndexOf("(")+1,primalName.lastIndexOf(")"));
    }

//    if(code != null && code.length() > 2){
//      this.primalName = code;
//    }

    this.chengeName = "";
    this.hiswpt = ItemValue.getTracksWaypoint(this.trk);
    this.tpoint = ItemValue.getTracksPoint(this.trk);
  }
  /**
   * 得到起点的航点
   */
  private Node getStartNode(){
    if ((hiswpt == null)||(tpoint == null)) {
      return null;
    }else{
      return this.getMostNearWpt(this.hiswpt,this.tpoint.item(0),true);
    }
  }
  /**
   * 得到终点的航点
   */
  private Node getEndNode(){
    if ((hiswpt == null)||(tpoint == null)) {
      return null;
    }else{
      return this.getMostNearWpt(this.hiswpt,this.tpoint.item(this.tpoint.getLength()-1),false);
    }
  }

  public String getStartEndName(){
    Node start = this.getStartNode();
    Node end = this.getEndNode();
    if ((start == null)||(end == null)) {
      return this.primalName;
    }else{
      return ItemValue.getWaypointName(start) + "-" + ItemValue.getWaypointName(end);
    }
  }
  /**
   * 得到最近的航点
   * qidian:是否是判断起点,如果是起点,应该从航点的顺序进行,否则倒序
   */
  private Node getMostNearWpt(Node[] wpts,Node tp,boolean qidian){
    if ((wpts == null)||(tp == null)) {
      return null;
    }

    double tpX = Double.parseDouble(ItemValue.getTracksPointX(tp));
    double tpY = Double.parseDouble(ItemValue.getTracksPointY(tp));
    double wptX = 0.0,wptY = 0.0;

    if (qidian) {
      for (int i = 0; i < wpts.length; i++) {
        wptX = Double.parseDouble(ItemValue.getWaypointX(wpts[i]));
        wptY = Double.parseDouble(ItemValue.getWaypointY(wpts[i]));
        if (this.getDistance(tpX, tpY, wptX, wptY) < this.NEAR_DISTANCE) {
          return wpts[i];
        }
      }
    }
    else {
      for (int i = wpts.length - 1; i >= 0; i--) {
        wptX = Double.parseDouble(ItemValue.getWaypointX(wpts[i]));
        wptY = Double.parseDouble(ItemValue.getWaypointY(wpts[i]));
        if (this.getDistance(tpX, tpY, wptX, wptY) < this.NEAR_DISTANCE) {
          return wpts[i];
        }
      }
    }
    return null;
  }
  /**
   * 求经纬度距离
   */
  private double getDistance(double tpX,double tpY,double wptX,double wptY){
    return Math.abs(Math.pow(((tpX-wptX) * (tpX-wptX) + (tpY-wptY) * (tpY-wptY)),0.5));
  }
}