Display wrong size

Question

Hi,
I had to hook my mac book pro up to a projector and had some difficulty getting the display to show up on screen.  We finally did, but when I disconnected the projector and restarted the laptop, my display size is off.  It has 1024 x 768 size, but it's too small so I'm using the 1024 x 768 stretch which looks off.  I'd appreciate any help. 
Thanks!
Faye

Answer 1

the problem is here
walls = new Rectangle(50, 50, WIDTH - 50, HEIGHT - 50);
at best the right/bottom walls will equal the frame's dimensions. try it as
walls = new Rectangle(50, 50, WIDTH - 100, HEIGHT - 100);
but this won't get you exactly what you want, due to the titlebar height (30?)
slightly different version
import javax.swing.*;
import java.awt.*;
class DemoWormPanel extends JPanel {
    private static final int WIDTH = 600, HEIGHT = 400;
    public DemoWormPanel() {
        setBackground(Color.BLACK);
        setPreferredSize(new Dimension(WIDTH-100,HEIGHT-100));
    public static void main(String[] args) {
        DemoWormPanel wp = new DemoWormPanel();
        JFrame f = new JFrame();
        f.setLayout(new GridBagLayout());
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.add(wp,new GridBagConstraints());
        f.setSize(WIDTH, HEIGHT);
        f.setVisible(true);
}