@Override
public void actionPerformed(ActionEvent e) {
platform1.update();
platform2.update();
platform3.update();
platform4.update();
super.repaint();
}
@Override
public void paintComponent(Graphics g) {
g.setColor(Color.blue);
g.fillRect(0, 0, nWidth, nHeight);
g.setColor(Color.DARK_GRAY);
platform1.draw((Graphics2D) g);
platform2.draw((Graphics2D) g);
platform3.draw((Graphics2D) g);
platform4.draw((Graphics2D) g);
// Get a rectangle to display with background color
}