Swing/Fade のバックアップ(No.14)

class FadeImage extends JComponent implements ActionListener {
  private int alpha = 10;
  public FadeImage() {
    super();
    setBackground(Color.BLACK);
  }
  @Override public void paintComponent(Graphics g) {
    Graphics2D g2d = (Graphics2D) g;
    g2d.setPaint(getBackground());
    g2d.fillRect(0, 0, getWidth(), getHeight());
    if(mode && alpha<10) {
      alpha = alpha + 1;
    }else if(!mode && alpha>0) {
      alpha = alpha - 1;
    }else{
      animator.stop();
    }
    g2d.setComposite(makeAlphaComposite(alpha*0.1f));
    g2d.drawImage(icon, null, 0, 0);
  }
  @Override public void actionPerformed(ActionEvent e) {
    repaint();
  }
  private AlphaComposite makeAlphaComposite(float alpha) {
    return AlphaComposite.getInstance(AlphaComposite.SRC_OVER, alpha);
  }
}