import java.awt.*;

import java.awt.event.*;



import javax.swing.*;



public class BeepAndSquiggle extends JPanel implements ActionListener, MouseMotionListener {



	// the Beep button in the BeepAndSquiggle window

	private JButton beepButton = new JButton("Click to Beep");

	

	private static final int NUM_POINTS = 40;

	private int curIndex = 0;

	private Point points[] = new Point[NUM_POINTS];

	

	// constructor

	public BeepAndSquiggle() {		

		add(beepButton);

		beepButton.addActionListener(this);

		addMouseMotionListener(this);

		for (int i=0; i < NUM_POINTS; i++) {

			points[i] = new Point(0,0);

		}

	}

	

	public void actionPerformed(ActionEvent e) {

		(new JButton()).getToolkit().beep();

	}



	public void mouseDragged(MouseEvent e) {

		points[curIndex] = new Point(e.getX(), e.getY());

		curIndex = (curIndex + 1) % NUM_POINTS;

		repaint();

	}

	

	public void mouseMoved(MouseEvent e) {

		// take no action when the mouse is moved

	}



	public void paintComponent(Graphics g) {

		super.paintComponent(g);

		Graphics2D g2 = (Graphics2D) g;

		g2.setColor(Color.BLACK);

		g2.setStroke(new BasicStroke(2));

		for (int i=0; i < NUM_POINTS-1; i++) {

			g2.drawLine((int) points[(curIndex+i)%NUM_POINTS].getX(),

					    (int) points[(curIndex+i)%NUM_POINTS].getY(),

					    (int) points[(curIndex+i+1)%NUM_POINTS].getX(),

					    (int) points[(curIndex+i+1)%NUM_POINTS].getY());

		}

	}

	

	// main method that creates a new BeepAndSquiggle window

	public static void main(String[] args) {

		JFrame window = new JFrame("Beep and Squiggle");

		BeepAndSquiggle panel = new BeepAndSquiggle();

		window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

		window.getContentPane().add(panel);

		window.pack();

		window.setBounds(250,250,250,250);

		window.setVisible(true);

	}

}