jappletmouse.java

来自「针对越来越多的用户喜欢JAVA」· Java 代码 · 共 49 行

import javax.swing. *;
import java.awt.event.*;
import java.awt.*;
import java.awt.Graphics;
public class JAppletMouse extends JApplet
{
  boolean flag= false;
  int x0, y0;
  int x1, y1;
  int width, height;
  Container panel;
  public void init()
  {
    panel= getContentPane();
    panel.addMouseListener(new MouseAdapter() {
    public void mousePressed(MouseEvent e)
    {
    flag = true;
    x0 = e. getX();
    y0 = e. getY();
  }
   public void mouseReleased(MouseEvent e)
   {
     x1= e.getX();
     y1 = e.getY();
     repaint();
   }
  } );
 }

  public void paint(Graphics g)
  {
    if(flag)
    {
      width=Math.abs(x1-x0);
      height=Math.abs(y1-y0);
      if(x0>x1&&y0>y1)  
      {
        x0 = x1; y0 = y1;
      }
      else if(x0> x1&& y0<y1)
         x0 = x1;
      else if(x0<x1 && y0>y1)
         y0 = y1;
      g.drawRect(x0, y0, width, height);
    }
  }
}