/**
 * Animator.java
 * 
 * @author Jeff Ondich
 * @version 3/3/05
 *
 * An illustration of how you can do animation within a JFrame.  Note
 * a couple notable features of this demo:
 * 
 * 1. This class is set up to respond to mouse clicks and keystrokes.
 * 2. The animation loop in the run() method is pretty bone-headed
 * in that it checks the current time every time through the main loop
 * instead of using some more sophisticated Java-provided timer mechanism.
 */

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


public class Animator
            extends JFrame
            implements MouseListener, KeyListener
{
    // Animation control data.
    private final long mAnimationDelay = 100;
    private long mMostRecentDrawTime;

    // For more sophisticated animations, you would undoubtedly want separate
    // classes for your drawable objects.  In an aquarium simulation, for
    // example, you would define a Fish class and just hold an array or
    // ArrayList of Fish references here.  Because this is a simple demo, I have
    // stored all the Box and Ball data here in the Animator class.
    private final int mDefaultBoxWidth = 50;
    private final int mDefaultBoxLeft = 40;
    private final int mDefaultBoxTop = 40;
    private final int mDefaultBoxSpeed = 3;
    private int mBoxWidth;
    private int mBoxLeft;
    private int mBoxTop;
    private int mBoxSpeed;

    private final Color mDefaultColor = Color.red;
    private Color mColor;

    private final int mDefaultBallDiameter = 60;
    private final int mDefaultBallLeft = 100;
    private final int mDefaultBallTop = 150;
    private final int mDefaultBallSpeed = -5;
    private int mBallDiameter;
    private int mBallLeft;
    private int mBallTop;
    private int mBallSpeed;


    public Animator( String title )
    {
		// Arrange for events to be sent to this window.
        addMouseListener( this );
        addKeyListener( this );

		// Initialize the window.
        setSize( 500, 600 );
        setLocation( 20, 20 );
		setTitle( title );
		setBackground( Color.white );
		toFront();
		setVisible( true );

        mColor = mDefaultColor;

		// Initialize the locations and directions of the ball and the box.
        mBoxWidth = mDefaultBoxWidth;
        mBoxLeft = mDefaultBoxLeft;
        mBoxTop = mDefaultBoxTop;
        mBoxSpeed = mDefaultBoxSpeed;

        mBallDiameter = mDefaultBallDiameter;
        mBallLeft = mDefaultBallLeft;
        mBallTop = mDefaultBallTop;
        mBallSpeed = mDefaultBallSpeed;

        // Timing
        mMostRecentDrawTime = System.currentTimeMillis();
    }

    public void paint( Graphics g )
    {
        g.clearRect( 0, 0, getWidth(), getHeight() );

        g.setColor( mColor );
        g.fillRect( mBoxLeft, mBoxTop, mBoxWidth, mBoxWidth );
        g.fillOval( mBallLeft, mBallTop, mBallDiameter, mBallDiameter );
    }

    public void mousePressed( MouseEvent e )
    {
    }

    public void mouseReleased( MouseEvent e )
    {
    }

    public void mouseClicked( MouseEvent e )
    {
    }

    public void mouseEntered( MouseEvent e )
    {
    }

    public void mouseExited( MouseEvent e )
    {
    }

    public void mouseDragged( MouseEvent e )
    {
    }

	public void keyTyped( KeyEvent e )
	{
		switch( e.getKeyChar() )
		{
		case 'r':
			mColor = Color.red;
			break;
			
		case 'b':
			mColor = Color.blue;
			break;

		default:
			mColor = Color.green;
			break;
		}

		repaint();
	}

	public void keyPressed( KeyEvent e )
	{
	}

	public void keyReleased( KeyEvent e )
	{
	}

    public void run()
    {
        while( true )
        {
            if( System.currentTimeMillis() > mMostRecentDrawTime + mAnimationDelay )
            {
                mMostRecentDrawTime = System.currentTimeMillis();

                // Move the box.
                mBoxLeft += mBoxSpeed;
                if( mBoxLeft < 0  ||  mBoxLeft >= getWidth() )
                {
                    mBoxSpeed = -mBoxSpeed;
                    mBoxLeft += 2*mBoxSpeed;
                }

                // Move the ball.
                mBallLeft += mBallSpeed;
                if( mBallLeft < 0  ||  mBallLeft >= getWidth() )
                {
                    mBallSpeed = -mBallSpeed;
                    mBallLeft += 2*mBallSpeed;
                }

                // Draw the modified data.
                repaint();
            }
        }
    }

	public static void main( String[] args )
	{
		Animator window = new Animator( "Animation" );
        window.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );

        window.run();
	}
}