Invasion – moving the shooter with the keyboard

This section offers a second possibility of how to move the Shooter. If you don't have a multitouch 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 code presents fragment 1 (of 2) of main.py:

275. # File name: main.py (Fragment 1)
276. from kivy.app import App
277. from kivy.lang import Builder
278. from kivy.core.window import Window
279. from kivy.uix.floatlayout import FloatLayout
280. from kivy.uix.label import Label
281. from kivy.animation import Animation
282. from kivy.clock import Clock
283. from fleet import Fleet
284. from shooter import Shooter
285. 
286. Builder.load_file('images.kv')
287. 
288. class Invasion(FloatLayout):
289. 
290.   def __init__(self, **kwargs):
291.     super(Invasion, self).__init__(**kwargs)
292.     self._keyboard = Window.request_keyboard(self.close, self)
293.     self._keyboard.bind(on_key_down=self.press)
294. ...