import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class BouncingBall {
private static class BallPanel extends JPanel {
// http://www.iconfinder.com/icondetails/8839/64/beach_ball_tourism_toys_icon
private final Icon ball = new ImageIcon( BouncingBall.class.getResource( "ball.png" ) );
private int ballX, ballY, dx = 2, dy = 2;
public BallPanel() {
new Timer( 10, new ActionListener() {
@Override
public void actionPerformed( ActionEvent evt ) {
ballX += dx;
ballY += dy;
if ( ballX <= 0 || ballX + ball.getIconWidth() >= getWidth() )
dx = -dx;
if ( ballY <= 0 || ballY + ball.getIconHeight() >= getHeight() )
dy = -dy;
repaint();
}
} ).start();
}
@Override
public void paint( Graphics g ) {
Graphics2D g2d = (Graphics2D) g;
g2d.setRenderingHint( RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON );
g2d.setRenderingHint( RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY );
g2d.setColor( Color.WHITE );
g2d.fill( getBounds() );
ball.paintIcon( null, g2d, ballX, ballY );
}
}
public static void main( String[] args ) {
JFrame f = new JFrame();
f.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
f.setIgnoreRepaint( true );
f.add( new BallPanel() );
f.setBounds( 200, 100, 400, 200 );
f.setVisible( true );
}
}
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