du40.java

清华大学java2 程序设计基础的绘图中的再现,希望喜欢,也是很不错的一些程序！

import java.awt.*;
import java.awt.event.*;;
public class du40 extends Frame implements MouseMotionListener
{
	static int x1,y1,x2,y2;
	public static void main(String args[])
	{
		du40 frm=new du40();
		frm.setTitle("绘图");
		frm.setBounds(10,10,250,200);
		frm.addMouseMotionListener(frm);
		frm.addMouseListener(new MyMouseList());
		frm.setVisible(true);
	}
	static class MyMouseList extends MouseAdapter
	{
		public void mousePressed(MouseEvent e)
		{
			x1=e.getX();
			x2=e.getY();
		}
	}
    public void mouseDragged(MouseEvent e)
    {
    	x2=e.getX();
    	y2=e.getY();
    	Graphics g=getGraphics();
    	g.drawLine(x1,y1,x2,y2);
    	x1=x2;
    	y1=y2;
    }
    public void mouseMoved(MouseEvent e){}
}