appletdemo4.java

java程序设计语言源代码

//Example 4 of Chapter 6

import  java.awt.*;
import  java.awt.event.*;
import  javax.swing.*;

public  class  AppletDemo4  extends  JApplet  implements  MouseMotionListener
{
	int x[], y[] ,i = 0;
	public  void  init()
	{
		getContentPane().setBackground( Color.white );
		addMouseMotionListener(this);
		x = new int[10000];
		y = new int[10000];
	}
	
	public  void  paint( Graphics  g )
	{
		super.paint( g );
		g.drawPolyline(x, y, i);
	}
	
	public  void  mouseDragged( MouseEvent  e )
	{
		if(i<x.length)
		{
			x[i] = e.getX();
			y[i] = e.getY();
			i++;
		}
		repaint();
	}
	
	public  void  mouseMoved( MouseEvent  e ) { }	
}