import javabook.*;
import java.awt.*;
import java.awt.event.*;

/**
 * Simple animation that demonstrates how to pause the
 * animation while an OutputBox is visible.  Take a look
 * at the variable "paused" in animate() and mousePressed().
 * Also note the use of waitUntilClose() in mousePressed().
 *
 * @author Jeff Ondich
 * @version 3/13/03
 */

class Pauser extends MainWindow implements MouseListener
{
    // Data values
    final private int windowWidth = 600;
    final private int windowHeight = 600;

    private int positionX;
    private int positionY;
    private int squareSize;
    private Color squareColor;
    private Color currentColor;
    private Color backgroundColor;
    private boolean goingUp;

	private boolean paused;

    public static void main(String[] args)
    {
		Pauser dw = new Pauser();
		dw.animate();
    }

    public Pauser()
    {
		addMouseListener( this );
		setVisible(true);
		toFront();

		setSize(windowWidth,windowHeight);
		backgroundColor = Color.white;
		setBackground(backgroundColor);

		squareSize = 50;
		positionX = windowWidth / 2;
		positionY = windowHeight / 2;
		goingUp = true;
		squareColor = Color.blue;

		paused = false;
	}

    public void paint( Graphics graphics )
    {
		graphics.setColor( currentColor );
		graphics.drawRect( positionX, positionY, squareSize, squareSize );
    }

    public void animate()
    {
		// Do the animation. This is an intentionally infinite loop.
		while( true )
		{
			if( !paused )
			{
	    		// Erase the square
	    		currentColor = backgroundColor;
	    		repaint();
	
		   	 	// Move the square
		    	newCenter();
	
			    // Draw the square
		    	currentColor = squareColor;
		    	repaint();
	
		    	// Wait a while. If Thread.sleep throws an EXCEPTION,
		   		 // catch the exception and ignore it.
		    	try 
		    	{
					Thread.sleep(10);
		    	}
		    	catch (InterruptedException e)
	    		{
	    		}
			}
		}
    }
     
    private void newCenter()
    {
		if( goingUp )
		    positionY = positionY - 1;
		else
		    positionY = positionY + 1;

		if( positionY >= windowHeight - squareSize )
		{
		    goingUp = true;
		    squareColor = Color.blue;
		}
		else if( positionY <= 0 )
		{
		    goingUp = false;
		    squareColor = Color.red;
		}
    }

    public void mousePressed( MouseEvent e )
    {
		paused = true;
		OutputBox out = new OutputBox( this );
		out.show();
		out.printLine( "Hi" );
		out.waitUntilClose();
		paused = false;
	}
    
    public void mouseReleased( MouseEvent e )
    {
    }

    public void mouseClicked( MouseEvent e )
    {
    }

    public void mouseEntered( MouseEvent e )
    {
    }

    public void mouseExited( MouseEvent e )
    {
    }
}