JPanel图像非常小

Question

我创建了一个新类CellPanel，它扩展了JPanel（它使用了GridBagLayout（））。 JFrame具有GridLayout（）和大小640x480。在CellPanel中，我添加了扩展JPanel的类FadeIn。 FadeIn具有淡入和淡出效果，但在这种特殊情况下淡入/淡出的图像非常小，否则它可以正常工作。

Class FadeIn：

public FadeIn(Image image) {
    imagem = image;
    timer = new Timer(50, this);
    timer.start();
}

public void paintComponent(Graphics g) {
    super.paintComponent(g);

    Graphics2D g2d = (Graphics2D) g;

    g2d.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER,alpha));
    g.drawImage(imagem,0,0,getWidth(),getHeight(),this);
}

@Override
public void actionPerformed(ActionEvent e) {
    if(fade == false)
    {
        alpha += 0.05f;
        if (alpha >1) {
            alpha = 1;
            fade = true;
        }
        repaint();
    }
    else if(fade == true)
    {
        alpha -= 0.05f;
        if (alpha <0) {
            alpha = 0;
            fade = false;
        }
        repaint();
    }
}

我正在使用这些类的代码：

    JFrame dialog = new JFrame();                                                                            
    dialog.setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);           
    dialog.setSize(640, 480);
    dialog.setResizable(false);
    dialog.setLocationRelativeTo(null);

    dialog.setLayout(new GridLayout(5,5));

    cell = new CellPanel(ground.getImage());
    cell.setLayout(new GridBagLayout());
    iconSolver = new ImageIcon("Resurse/fadingRight.png");
    fade = new FadeIn(iconSolver.getImage());
    fade.setSize(iconSolver.getIconWidth(), iconSolver.getIconHeight());
    fade.setOpaque(false);
    cell.add(fade);

    cell.setSize(dialog.getWidth()/5,dialog.getWidth()/5);
    dialog.getContentPane().add(cell);
    dialog.setVisible(true);