/*
* Swing version.
*/
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
/*
* This applet displays several images in a row. However,
* it doesn't wait for the images to fully load before drawing
* them, which causes the weird effect of the animation appearing
* from the top down.
*/
public class ImageSequenceTimer extends JApplet
implements ActionListener {
ImageSQPanel imageSQPanel;
static int frameNumber = -1;
int delay;
Thread animatorThread;
static boolean frozen = false;
Timer timer;
//Invoked only when this is run as an applet.
public void init() {
//Get the images.
Image[] images = new Image[10];
for (int i = 1; i <= 10; i++) {
images[i-1] = getImage(getCodeBase(), "images/T"+i+".gif");
}
buildUI(getContentPane(), images);
startAnimation();
}
//Note: Container must use BorderLayout, which is the
//default layout manager for content panes.
void buildUI(Container container, Image[] dukes) {
int fps = 10;
//How many milliseconds between frames?
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);
imageSQPanel = new ImageSQPanel(dukes);
container.add(imageSQPanel, BorderLayout.CENTER);
imageSQPanel.addMouseListener(new MouseAdapter() {
public void mousePressed(MouseEvent e) {
if (frozen) {
frozen = false;
startAnimation();
} else {
frozen = true;
stopAnimation();
}
}
});
}
public void start() {
startAnimation();
}
public void stop() {
stopAnimation();
}
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();
}
}
}
public synchronized void stopAnimation() {
//Stop the animating thread.
if (timer.isRunning()) {
timer.stop();
}
}
public void actionPerformed(ActionEvent e) {
//Advance the animation frame.
frameNumber++;
//Display it.
imageSQPanel.repaint();
}
class ImageSQPanel extends JPanel{
Image dukesWave[];
public ImageSQPanel(Image[] dukesWave) {
this.dukesWave = dukesWave;
}
//Draw the current frame of animation.
public void paintComponent(Graphics g) {
super.paintComponent(g); //paint background
//Paint the frame into the image.
try {
g.drawImage(dukesWave[ImageSequenceTimer.frameNumber%10],
0, 0, this);
} catch (ArrayIndexOutOfBoundsException e) {
//On rare occasions, this method can be called
//when frameNumber is still -1. Do nothing.
return;
}
}
}
//Invoked only when this is run as an application.
public static void main(String[] args) {
Image[] waving = new Image[10];
for (int i = 1; i <= 10; i++) {
waving[i-1] =
Toolkit.getDefaultToolkit().getImage(
"images/T"+i+".gif");
}
JFrame f = new JFrame("ImageSequenceTimer");
f.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
ImageSequenceTimer controller = new ImageSequenceTimer();
controller.buildUI(f.getContentPane(), waving);
controller.startAnimation();
f.setSize(new Dimension(75, 100));
f.setVisible(true);
}
}
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