import java.awt.*;
import java.applet.*;
import java.awt.event.*;
public class m2 extends Applet implements MouseMotionListener{
	int x=0,y =0;
	public void init() {
		setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));
		setBackground(Color.green);
		addMouseMotionListener(this);	}
	public void paint(Graphics g) {
		if(x!=0&&y!=0){
			g.setColor(Color.red);
			g.drawLine(x,y ,x,y); //յͬһ
			}
		}
	public void mouseDragged(MouseEvent e){
		x=(int)e.getX();
		y=(int)e.getY();
		repaint();
	}
	public void mouseMoved(MouseEvent e){}
	public void update(Graphics g){ //дupdate
		paint(g);
	}	
}
