/*
 * Swing version.
 */

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

/* 
 * A template for animation applications.
 */
public class MovingLine extends JFrame
    implements ActionListener {
    Timer timer;
    boolean frozen = false;
    Component moving;

    MovingLine(int fps, String windowTitle) {
        super(windowTitle);
        int delay = (fps > 0) ? (1000 / fps) : 100;

        //Set up a timer that calls this object's action handler.
        timer = new Timer(delay, this);
        timer.setInitialDelay(0);
        timer.setCoalesce(true);

        addWindowListener(new WindowAdapter() {
		public void windowIconified(WindowEvent e) {
		    stopAnimation();
		}
		public void windowDeiconified(WindowEvent e) {
		    startAnimation();
		}
		public void windowClosing(WindowEvent e) {
		    System.exit(0);
		}  
	    });

        Component contents = new Components();
        contents.addMouseListener(new MouseAdapter() {
		public void mousePressed(MouseEvent e) {
		    if (frozen) {
			frozen = false;
			startAnimation();
		    } else {
			frozen = true;
			stopAnimation();
		    }
		}
	    });

        getContentPane().add(contents, BorderLayout.CENTER);
    }

    //Can be invoked by any thread (since timer is thread-safe).
    public void startAnimation() {
        if (frozen) {
            //Do nothing.  The user has requested that we
            //stop changing the image.
        } else {
            //Start animating!
            if (!timer.isRunning()) {
                timer.start();
            }
        }
    }

    //Can be invoked by any thread (since timer is thread-safe).
    public void stopAnimation() {
        //Stop the animating thread.
        if (timer.isRunning()) {
            timer.stop();
        }
    }

    public void actionPerformed(ActionEvent e) {
        //Advance the animation frame.
        repaint();
    }

    public static void main(String args[]) {

        int fps = 10;

        //Get frames per second from the command line argument.
        if (args.length > 0) {
            try {
                fps = Integer.parseInt(args[0]);
            } catch (Exception e) {}
        }
        MovingLine moving = new MovingLine(fps, "Moving line with Timer --" +
					   "Click to pause or continue");
        moving.pack();

	moving.setSize(600,200);
        moving.setVisible(true);

        //It's OK to start the animation here because 
        //startAnimation can be invoked by any thread.
        moving.startAnimation();
    }
}