private Frame getFrame() {
if (frame != null) return frame;
frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Dimension dim = Toolkit.getDefaultToolkit().getScreenSize();
frame.setLocation(
(dim.width - viewSize.getRealWidth()) / 2, (dim.height - viewSize.getRealHeight()) / 2);
frame.add(getPanel());
frame.pack();
return frame;
}
private Panel getPanel() {
if (panel != null) return panel;
panel = new Panel(viewSize);
panel.setPreferredSize(viewSize.getDimension());
return panel;
}