import java.awt.*; import java.awt.event.*; import javax.swing.*; public class LogoAnimator extends JPanel implements ActionListener { protected ImageIcon images[]; protected int totalImages = 30, currentImage = 0, animationDelay = 50; // 50 millisecond delay protected Timer animationTimer; public LogoAnimator() { setSize( getPreferredSize() ); images = new ImageIcon[ totalImages ]; System.out.println("Loading images"); for ( int i = 0; i < images.length; ++i ) { images[ i ] = new ImageIcon( "images/deitel" + i + ".gif" ); System.out.print('.'); } System.out.println("\nDone"); startAnimation(); } public void paintComponent( Graphics g ) { super.paintComponent( g ); if ( images[ currentImage ].getImageLoadStatus() == MediaTracker.COMPLETE ) { images[ currentImage ].paintIcon( this, g, 0, 0 ); currentImage = ( currentImage + 1 ) % totalImages; } } public void actionPerformed( ActionEvent e ) { repaint(); } public void startAnimation() { if ( animationTimer == null ) { currentImage = 0; animationTimer = new Timer( animationDelay, this ); animationTimer.start(); } else // continue from last image displayed if ( ! animationTimer.isRunning() ) animationTimer.restart(); } public void stopAnimation() { animationTimer.stop(); } public Dimension getMinimumSize() { return getPreferredSize(); } public Dimension getPreferredSize() { return new Dimension( 160, 80 ); } public static void main( String args[] ) { LogoAnimator anim = new LogoAnimator(); JFrame app = new JFrame( "Animator test" ); app.getContentPane().add( anim, BorderLayout.CENTER ); app.addWindowListener( new WindowAdapter() { public void windowClosing( WindowEvent e ) { System.exit( 0 ); } } ); // The constants 10 and 30 are used below to size the // window 10 pixels wider than the animation and // 30 pixels taller than the animation. app.setSize( anim.getPreferredSize().width + 10, anim.getPreferredSize().height + 30 ); app.setVisible(true); } }
Maintained by John Loomis, last updated 19 July 2000