In my code I am trying to paint by JFrame but it is not painting correctly. I tell the frame to paint in the beginning where I create it however it is the normal grey color once it is created. I think it may have to do with the fact that I am repainting it, if so how can I make sure it is repainted yellow? Could someone try to figure out why my code is not painting the JFrame Yellow? Thank you!
public class EvolutionColor {
public static void main(String args[]) {
JFrame frame = new JFrame("Bouncing Ball");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
BallPanel bp = new BallPanel();
frame.add(bp);
frame.setSize(600, 600); // set frame size
frame.setVisible(true); // display frame
frame.setBackground(Color.YELLOW);
}
class BallPanel extends JPanel implements ActionListener {
private int delay = 10;
protected Timer timer;
private int x = 0; // x position
private int y = 0; // y position
private int radius = 15; // ball radius
private int dx = 2; // increment amount (x coord)
private int dy = 2; // increment amount (y coord)
public BallPanel() {
timer = new Timer(delay, this);
timer.start(); // start the timer
}
public void actionPerformed(ActionEvent e) {
repaint();
}
public void paintComponent(Graphics g) {
super.paintComponent(g); // call superclass's paintComponent
g.setColor(Color.red);
// check for boundaries
if (x < radius) {
dx = Math.abs(dx);
}
if (x > getWidth() - radius) {
dx = -Math.abs(dx);
}
if (y < radius) {
dy = Math.abs(dy);
}
if (y > getHeight() - radius) {
dy = -Math.abs(dy);
}
// adjust ball position
x += dx;
y += dy;
g.fillOval(x - radius, y - radius, radius * 2, radius * 2);
}
}
