Question

I have a script that cycles (almost like a slideshow) through a Vector object (flipBook), using a Thread (animationThread), and adds them to a JPanel. However, the added image is only 2×2 pixels large.
I’ve verified the images are 50×50, but they don’t appear to be properly showing.

Here’s some of the code going on behind the Thread instance. I’m not entirely sure which code would be beneficial for finding the source for.

public void startThread() {
    if (flipWidth != 0 && flipHeight != 0) {
        System.out.println("[ AnimationAsset ] " + "We're starting the thread");
        Runnable r = new Runnable() {
            @Override
            public void run() {
                runWork();
            }           
        };
        animationThread = new Thread(r, "AnimationThread");
        animationThread.start();
        going = true;
    }
}
private void runWork() {
    try {
        while (going) {
            repaint();
            flipIndex = (flipIndex + 1) % numFlips;
            System.out.println("[ AnimationAsset ] flipIndex: " + flipIndex);
            Thread.sleep(1000);
        }
    } catch (InterruptedException e) {
        Thread.currentThread().interrupt();
        System.out.println("[ AnimationAsset ] " + "Interrupted");
    }
}
public void paint(Graphics g) {
    update(g);
}
public void update(Graphics g) {
    System.out.println("[ AnimationAsset ] " + flipIndex);
    ((Graphics2D) g).drawImage(flipBook.get(flipIndex), null, 5, 5);

}

Answer 1

and adds them to a JPanel

This is not a Swing code. This is AWT code.

You would never override the update() and paint() methods this way when using Swing. Get rid of this code and start over.

To do this in Swing I would use a JLabel with an Icon and add the label to the frame.

Then, to do animation in SWing your should use a Swing Timer.

When the timer fires you simply use the setIcon(…) method of the label to replace the old icon with your new icon.