mysegmentaction.java~1~

Java画版程序。......................要求变态。

package myshapeaction;

/**
 * Title:
 * Description:
 * Copyright:    Copyright (c) 2002
 * Company:
 * @author
 * @version 1.0
 */
import java.awt.event.*;

import myshape.*;
import java.math.*;
import java.util.*;
public class MySegmentAction extends MyActionAdapter{

  public MySegmentAction() {
  }
  private boolean canDragged=false;
  private MyPoint startPoint;
  private MyPoint endPoint=null;
  private MySegment segment;

  public boolean mousePressed(MouseEvent e,Object o){
     // System.out.print("lkdflskfd");
     LinkedList l=(LinkedList)o;
     if(!canDragged){
        if(l.isEmpty()){
          startPoint=new MyPoint(e.getX(),e.getY());
        }
        else{
           startPoint=((MyShape)l.getFirst()).getPoint();
        }
        //startPoint.attachToOthers=true;
          canDragged=true;
        drawedItemList.add(startPoint);
        segment=null;
     }
        return true;
  }


  public boolean mouseDragged(MouseEvent e,Object o){

    if(canDragged  ){
       endPoint=new MyPoint(e.getX(),e.getY());
       //endPoint.attachToOthers=true;
       if(!endPoint.nearTo(startPoint))
        {
         if(segment!=null){
            drawedItemList.removeLast();
            drawedItemList.removeLast();
          }
         segment=new MySegment(startPoint,endPoint);
         drawedItemList.add(endPoint);
         drawedItemList.add(segment);
       }
    }
       return true;
  }
  public boolean mouseReleased(MouseEvent e,Object o){
   //  System.out.print("lkdflskfd");
      if(startPoint!=null ){
       /* if(endPoint==null){
          drawedItemList.removeLast();
        }
        else if(endPoint.nearTo(centerPoint)){
          drawedItemList.removeLast();
        }*/
      startPoint=null;
      canDragged=false;
     }
        return true;
  }
}