CODEWITHSUNDEEP
javaspringcolorsbackground
SuperHanz98
SuperHanz98

Reputation: 2240

can't change colour of background swing

I can't change the colour of my background in swing. It is a really simple pong game I was just messing around with but I can't change the background colour. Here is my code [the background colour is changed in the main](I know it's messy, I'm still learning):

public class Pong extends JPanel {
     int x = 0;
     int y = 000;
     int yP = 300;
     int xP = 300;

     int border = 50;
     boolean ballGoingDown = true;
     boolean ballGoingRight = true;

     private void moveBall() throws InterruptedException {
         if (ballGoingRight == true) {
             x++;
         }

         if (ballGoingRight == false) {
             x--;
         }


         if (ballGoingDown == true) {
             y++;
         }

         if (ballGoingDown == false) {
             y--;
         }

         if (y == getHeight() - border) {
             ballGoingDown = false;
         }

         if (y == 0) {
             ballGoingDown = true;
         }

         if (x == getWidth() - border) {
             ballGoingRight = false;
         }

         if (x == 0) {
             ballGoingRight = true;
         }
     }


     @
     Override
     public void paint(Graphics G) {
         super.paint(G);
         G.fillOval(x, y, 50, 50);
     }

     public static void main(String[] args) throws InterruptedException {
         JFrame frame = new JFrame("Pong");
         frame.setSize(700, 500);

         frame.setVisible(true);
         frame.getContentPane().setBackground(Color.red);
         frame.setLocationRelativeTo(null);
         frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
         Pong game = new Pong();
         frame.add(game);

         while (true) {
             game.repaint();
             game.moveBall();
             Thread.sleep(1);

         }
     }
 }

Upvotes: 1

Views: 784

Answers (1)

byxor
byxor

Reputation: 6349

You're setting the JFrame's background to be red, but you've added a JPanel which covers it.

You can fix this by changing:

frame.getContentPane().setBackground(Color.red);

to

game.setBackground(Color.red);

Upvotes: 1

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