This section offers a second possibility of how to move the shooter. If you don't have a multi-touch device, you will need to use something else to control the position of the shooter easily while you use the mouse to shoot. The following is the code, fragment 1, (of 2) of main.py:
280. # File name: main.py (Fragment 1)
281. from kivy.app import App
282. from kivy.lang import Builder
283. from kivy.core.window import Window
284. from kivy.uix.floatlayout import FloatLayout
285. from kivy.uix.label import Label
286. from kivy.animation import Animation
287. from kivy.clock import Clock
288. from fleet import Fleet
289. from shooter import Shooter
290.
291. Builder.load_file('images.kv')
292.
293. class Invasion(FloatLayout):
294.
295. def __init__(self, **kwargs):
296. super(Invasion, self).__init__(**kwargs)
297. self._keyboard = Window.request_keyboard(self.close, self)
298. self._keyboard.bind(on_key_down=self.press...