/*
* Swing version.
*/
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
/*
* A template for animation applets.
*/
public class AnimatorAppletTimer extends JApplet
implements ActionListener {
int frameNumber = -1;
Timer timer;
boolean frozen = false;
JLabel label;
public void init() {
String str;
int fps = 0;
//How many milliseconds between frames?
str = getParameter("fps");
try {
if (str != null) {
fps = Integer.parseInt(str);
}
} catch (Exception e) {}
int delay = (fps > 0) ? (1000 / fps) : 100;
//Set up a timer that calls this object's action handler.
timer = new Timer(delay, this);
timer.setInitialDelay(0);
timer.setCoalesce(true);
label = new JLabel("Frame ", JLabel.CENTER);
label.addMouseListener(new MouseAdapter() {
public void mousePressed(MouseEvent e) {
if (frozen) {
frozen = false;
startAnimation();
} else {
frozen = true;
stopAnimation();
}
}
});
getContentPane().add(label, BorderLayout.CENTER);
}
//Invoked by the browser only. invokeLater not needed
//because startAnimation can be called from any thread.
public void start() {
startAnimation();
}
//Invoked by the browser only. invokeLater not needed
//because stopAnimation can be called from any thread.
public void stop() {
stopAnimation();
}
//Can be invoked from any thread.
public synchronized void startAnimation() {
if (frozen) {
//Do nothing. The user has requested that we
//stop changing the image.
} else {
//Start animating!
if (!timer.isRunning()) {
timer.start();
}
}
}
//Can be invoked from any thread.
public synchronized void stopAnimation() {
//Stop the animating thread.
if (timer.isRunning()) {
timer.stop();
}
}
public void actionPerformed(ActionEvent e) {
//Advance the animation frame.
frameNumber++;
//Request that the frame be painted.
label.setText("Frame " + frameNumber);
}
}
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