CHAPTER 10 ■ ANIMATION
private JFrame frame = new Jframe("MouseSprites");
// Here's our very slow timer. 4 times a second – vroom!
private Timer timer = new Timer(250, this);private void addMenu(JFrame frame) {
JMenu file = new JMenu("File");
file.setMnemonic('F');
JMenuItem exitItem = new JMenuItem("Exit");
exitItem.setMnemonic('x');
exitItem.addActionListener(this);
file.add(exitItem);
JMenuBar menuBar = new JMenuBar();
menuBar.add(file);
frame.setJMenuBar(menuBar);
}private void createAndShowGUI() {
addMenu(frame);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
mouseSpritePanel.setPreferredSize(new Dimension(400, 200));
mouseSpritePanel.addMouseListener(this);
mouseSpritePanel.setBackground(Color.WHITE);
frame.getContentPane().add(mouseSpritePanel);
frame.pack();
frame.setVisible(true);
timer.start();
}public static void main(String[] args) {
MouseSprites mouseSprite = new MouseSprites();
mouseSprite.createAndShowGUI();
}// This method listens to the timer
public void actionPerformed(ActionEvent e) {
if (e.getActionCommand() != null) {
// If the user chooses Exit, we exit
if (e.getActionCommand().equals("Exit")) {
timer.stop();
System.exit(0);
}
}
// otherwise, we redraw the panel
// (which is how we achieve animation)
mouseSpritePanel.repaint();
}@Override
public void mouseClicked(MouseEvent e) {
}