例7-24.java

来自「用Java和XML建立试题库管理系统,试题库管理系统的设计」· Java 代码 · 共 63 行

//example 7-24
import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;
public class tt extends Applet implements MouseListener,MouseMotionListener
{
   int xPos,yPos=-10;
   String s="";
   int d=3;
   public void init()
   {
   	 addMouseListener(this);
   	 addMouseMotionListener(this);
   }
   public void paint(Graphics g)
   {
   	 if(s.equals("Dragging")) g.fillOval(xPos,yPos,d,d);
   	 if(s.equals("Clicked"))
   	 {
   	 	g.setColor(Color.red);
   	 	g.drawLine(xPos-d,yPos,xPos+d,yPos);
   	 	g.drawLine(xPos,yPos-d,xPos,yPos+d);
   	 }
   	 else 
   	    g.setColor(Color.black);
   }
   public void update(Graphics g)
   {
   	 paint(g);
   }
   private void setValues(String event,int x,int y)
   {
   	 s=event;xPos=x; yPos=y;repaint();
   }
   public void mouseClicked(MouseEvent e)
   {
   	 setValues("Clicked",e.getX(),e.getY());
   }
   public void mousePressed(MouseEvent e)
   {
   	 setValues("Pressed",e.getX(),e.getY());
   }
   public void mouseReleased(MouseEvent e)
   {
   	 setValues("Released",e.getX(),e.getY());
   }
   public void mouseEntered(MouseEvent e)
   {
   	 showStatus("Mouse in Applet area");
   }
   public void mouseExited(MouseEvent e)
   {
   	 showStatus("Mouse outside Applet area");
   }
   public void mouseDragged(MouseEvent e)
   {
   	 setValues("Dragging",e.getX(),e.getY());
   }
   public void mouseMoved(MouseEvent e)
   {
   	 setValues("Moving",e.getX(),e.getY());
   }
}