连续直线2.java

使用java的2d功能实现的鼠标自由绘制椭圆的小程序！

package statistics;

import java.awt.*;
import java.awt.event.*;
import java.applet.*;

/**
 * <p>Title: </p>
 * <p>Description: </p>
 * <p>Copyright: Copyright (c) 2004</p>
 * <p>Company: </p>
 * @author not attributable
 * @version 1.0
 */

public class 连续直线2 extends Applet {
  private boolean isStandalone = false;
  Point spoint;
  Point epoint;
  boolean flag,drawing;

  //Get a parameter value
  public String getParameter(String key, String def) {
    return isStandalone ? System.getProperty(key, def) :
      (getParameter(key) != null ? getParameter(key) : def);
  }

  //Construct the applet
  public 连续直线2() {
  }
  //Initialize the applet
  public void init() {
    flag=false;
    drawing=false;
    try {
      jbInit();
    }
    catch(Exception e) {
      e.printStackTrace();
    }
  }
  //Component initialization
  private void jbInit() throws Exception {
    //this.setBackground(Color.white);
    this.addMouseListener(new 连续直线2_this_mouseAdapter(this));
    this.addMouseMotionListener(new 连续直线2_this_mouseMotionAdapter(this));
  }
  //Get Applet information
  public String getAppletInfo() {
    return "Applet Information";
  }
  //Get parameter info
  public String[][] getParameterInfo() {
    return null;
  }
public void paint(Graphics g){
    if(drawing){
      g.setColor(Color.BLUE);
      g.drawLine(spoint.x,spoint.y,epoint.x,epoint.y);
    }
}
public void update(Graphics g){
      paint(g);
    }
  void this_mouseMoved(MouseEvent e) {
if(flag){
      spoint=new Point(e.getX(),e.getY());
      flag=!flag;
    }
    else {
      epoint=new Point(e.getX(),e.getY());
      flag=!flag;
    }
    repaint();
  }

  void this_mouseClicked(MouseEvent e) {
drawing=true;
    spoint=new Point(e.getX(),e.getY());
  }
}

class 连续直线2_this_mouseMotionAdapter extends java.awt.event.MouseMotionAdapter {
  连续直线2 adaptee;

  连续直线2_this_mouseMotionAdapter(连续直线2 adaptee) {
    this.adaptee = adaptee;
  }
  public void mouseMoved(MouseEvent e) {
    adaptee.this_mouseMoved(e);
  }
}

class 连续直线2_this_mouseAdapter extends java.awt.event.MouseAdapter {
  连续直线2 adaptee;

  连续直线2_this_mouseAdapter(连续直线2 adaptee) {
    this.adaptee = adaptee;
  }
  public void mouseClicked(MouseEvent e) {
    adaptee.this_mouseClicked(e);
  }
}