cuttofittrk.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.output.toLd.repeate;

import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import java.util.Vector;
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 CutToFitTrk {
  private Node trk = null;
  private NodeList tps = null;
  private Node fitPointA = null, fitPointB = null;
  public CutToFitTrk() {
  }

  /**
   * 返回的是 新产生 的 航迹 点
   */
  private Node getFootPoint_ByTp(Node begin, Node end, Node trackPoint) {

    double bx, by, bz, ex, ey, ez, px, py, pz, fpx, fpy, fpz;
    /**
     * begin 经纬度
     */
    bx = Double.parseDouble(ItemValue.getTracksPointX(begin));
    by = Double.parseDouble(ItemValue.getTracksPointY(begin));
    bz = Double.parseDouble(ItemValue.getTracksPointZ(begin));

    /**
     * end 经纬度
     */
    ex = Double.parseDouble(ItemValue.getTracksPointX(end));
    ey = Double.parseDouble(ItemValue.getTracksPointY(end));
    ez = Double.parseDouble(ItemValue.getTracksPointZ(end));

    /**
     * 航迹点 经纬度
     */
    px = Double.parseDouble(ItemValue.getTracksPointX(trackPoint));
    py = Double.parseDouble(ItemValue.getTracksPointY(trackPoint));
    pz = Double.parseDouble(ItemValue.getTracksPointZ(trackPoint));

    double k = (ey - by) / (ex - bx);

    fpx = (k * k * bx + k * (py - by) + px) / (k * k + 1);
    fpy = k * (fpx - bx) + by;

    if (bz - ez > 0.00001) {
      double k1 = (ey - by) / (ez - bz);
      fpz = (k1 * k1 * bz + k1 * (py - by) + pz) / (k1 * k1 + 1);
    }
    else {
      fpz = bz;
    }
    double minx = Math.min(bx, ex);
    double miny = Math.min(by, ey);
    double minz = Math.min(bz, ez);
    double maxx = Math.max(bx, ex);
    double maxy = Math.max(by, ey);
    double maxz = Math.max(bz, ez);

    Node fp = ItemValue.getNewTrackPoint("" + fpx, "" + fpy, "" + fpz, "");
    if (minx < fpx && fpx < maxx && miny < fpy && fpy < maxy) { // && minz<fpz && fpz<maxz){
      return fp;
    }
    if (getDistance_ByTp(begin, trackPoint) < getDistance_ByTp(end, trackPoint)) {
      return begin;
    }
    else {
      return end;
    }
  }

  private double getDistance_ByTp(Node tp1, Node tp2) {
    double tpx = Double.parseDouble(ItemValue.getTracksPointX(tp1));
    double tpy = Double.parseDouble(ItemValue.getTracksPointY(tp1));
    double wpx = Double.parseDouble(ItemValue.getTracksPointX(tp2));
    double wpy = Double.parseDouble(ItemValue.getTracksPointY(tp2));
    return Math.sqrt( (tpx - wpx) * (tpx - wpx) + (tpy - wpy) * (tpy - wpy));
  }


  private void deleteExcrescentTps() {
    if (this.tps == null) {
      return;
    }
    else {
//      Vector ve = new Vector();
      boolean finded = false;
      for (int i = 0; i < this.tps.getLength(); i++) {
        if (this.tps.item(i) == this.fitPointA || this.tps.item(i) == this.fitPointB || finded) {
          finded = true;
        }
        if (finded &&
            (this.tps.item(i) == this.fitPointA ||
             this.tps.item(i) == this.fitPointB)) {
          finded = false;
        }
        if (!finded) {
          ItemValue.deleteTracksPoint(this.trk, this.tps.item(i));
        }
      }
    }
    System.out.println(this.getClass().getName()   +":deleteExcrescentTps!");
  }

  public Node createNewTrk() {
    try {
      this.tps = ItemValue.getTracksPoint(this.trk);
    }
    catch (Exception ex) {
      this.tps = null;
    }
    this.deleteExcrescentTps();
    return this.trk;
  }

  public static void main(String[] args) {
    CutToFitTrk cuttofittrk = new CutToFitTrk();
  }

  public void setFitPointA(Node fitPointA) {
    this.fitPointA = fitPointA;
  }

  public void setTrk(Node trk) {
    this.trk = trk;
  }

  public void setFitPointB(Node fitPointB) {
    this.fitPointB = fitPointB;
  }
}