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

public class Exer02 {
	private JFrame frame = new JFrame("�t�e�n�Q�[��");
	private JPanel pane = (JPanel)frame.getContentPane();
	private int w = 400, h = 400;
	private int bx = 170;
	private Canvas canvas = new Canvas(){
		@Override
		public void update(Graphics g){
			paint(g);
		}
		
		@Override
		public void paint(Graphics g){
			Rectangle rec = g.getClipBounds();
			w = rec.width;
			h = rec.height;
			Image img = createImage(w, h);
			Graphics ofg = img.getGraphics();
			ofg.setColor(Color.BLUE);
			ofg.fillRect(bx - 30, h - 50, 60, 20);
			g.drawImage(img, 0, 0, this);
			try{Thread.sleep(20);}catch(Exception ex){}
			repaint();
		}
	};
	
	public Exer02(){
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		canvas.setBackground(Color.WHITE);
		canvas.setSize(w, h);
		canvas.addMouseMotionListener(new MouseMotionAdapter(){
			@Override
			public void mouseMoved(MouseEvent ev){
				bx = ev.getX();
				if(bx > w - 30) bx = w - 30;
				else if(bx < 30) bx = 30;
			}
		});
		pane.add(canvas);
		frame.pack();
		frame.setVisible(true);
	}
	
	public static void main(String[] args) {
		G106WinLF.set();
		new Exer02();
	}
}