Ich versuche 2 Boxen zu animieren, um von rechts oben nach links unten von einem JPanel zu gehen. Für die Animation benutze ich einen Swing Timer undSwingUtilities.invokeLater(). Das Problem ist, dass wenn ich auf den Startknopf klicke. Es wird nur die blaue Box animiert und verschoben, nicht die rote.

Hier ist der Code:

//import neccessary stuff
public class Example extends JFrame {
public static void main(String[] args) {
    Example e = new Example();
    e.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    e.setSize(600, 565);
    e.setVisible(true);
}</code>

private JButton startButton = new JButton("Start");

private JPanel theTable = new table();


public Example() {
    add(startButton, BorderLayout.SOUTH);
    add(theTable, BorderLayout.CENTER);
    Handler handler = new Handler();
    startButton.addActionListener(handler);
}

public ArrayList<Integer> xPos, yPos;
final int START_POSITION_X = 470;
final int START_POSITION_Y = 10;

final int[] END_POSITION_X = {70, 87};
final int END_POSITION_Y = 160;

private class table extends JPanel {

    public table() {
        xPos = new ArrayList<Integer>();
        yPos = new ArrayList<Integer>();
        xPos.add(START_POSITION_X); //default position for box1
        yPos.add(START_POSITION_Y);
        xPos.add(START_POSITION_X); //default position for box2
        yPos.add(START_POSITION_Y);
    }

    public void paintComponent(Graphics g) {

        super.paintComponent(g);
        this.setBackground(new Color(-16756217));
        g.setColor(Color.RED);
        g.fillRect(xPos.get(1), yPos.get(1), 89, 129);
        g.setColor(Color.BLUE);
        g.fillRect(xPos.get(0), yPos.get(0), 89, 129);

        if (isAnimating) {
            animator.start();
        } else {
            animator.stop();
            isAnimating = false;
        }
    }
}

private class Handler implements ActionListener {
    public void actionPerformed(ActionEvent e) {

        Runnable r1 = new Runnable() {
            @Override
            public void run() {
                animateCard(0, END_POSITION_X[0], END_POSITION_Y);
            }
        };
        SwingUtilities.invokeLater(r1);
        animateCard(1, END_POSITION_X[1], END_POSITION_Y);
    }
}

public void animateCard(int card, int xDest, int yDest) {
    cardID = card;
    xDestination = xDest;
    yDestination = yDest;
    totalXDistance = Math.abs(xDestination - START_POSITION_X);
    totalYDistance = Math.abs(yDestination - START_POSITION_Y);
    animator.start();
}
int cardID;
int xDestination, yDestination, totalXDistance, totalYDistance;
boolean isAnimating = false;
Timer animator = new Timer(15, new ActionListener() {
    int startVel = 20;

    public void actionPerformed(ActionEvent e) {
        double xRelDistance, xAbsDistance, xVel;
        int xRealVel;
        xAbsDistance = xDestination - xPos.get(cardID);
        xRelDistance = xAbsDistance / totalXDistance;
        xVel = startVel * xRelDistance;

        double yRelDistance, yAbsDistance, yVel;
        yAbsDistance = yDestination - yPos.get(cardID);
        yRelDistance = yAbsDistance / totalYDistance;
        yVel = startVel * yRelDistance;

        if (xVel > 0) {
            xRealVel = (int) java.lang.Math.ceil(xVel);
        } else {
            xRealVel = (int) java.lang.Math.floor(xVel);

        }
        xPos.set(cardID, xPos.get(cardID) + xRealVel);
        int yRealVel;
        if (xVel > 0) {
            yRealVel = (int) java.lang.Math.ceil(yVel);
            yPos.set(cardID, yPos.get(cardID) + yRealVel);
        } else {
            yRealVel = (int) java.lang.Math.floor(yVel);

        }
        yPos.set(cardID, yPos.get(cardID) + yRealVel);

        if ((xPos.get(cardID) == xDestination) && (yPos.get(cardID) == yDestination)) {
            isAnimating = false;
        } else {
            isAnimating = true;
        }
        repaint();
    }
});

}