def __init__(self, WIN_HEIGHT_DEFAULT, WIN_WIDTH_DEFAULT):
# save window height and width that we started out with.
if WIN_HEIGHT_DEFAULT is not None:
self.SETTINGS.WINDOW_HEIGHT_DEFAULT = WIN_HEIGHT_DEFAULT
if WIN_WIDTH_DEFAULT is not None:
self.SETTINGS.WIN_WIDTH_DEFAULT = WIN_WIDTH_DEFAULT
# always initialize with 'BasicScreen' config.
self.current_screen = BasicScreen(self)
