Fleet – infinite concatenation of animations

In the last section we studied how we can concatenate two animations. What happens if we want to have an object that is constantly moving from right to left and vice versa? This is the case of the Fleet: we want it constantly moving from left to right, like the yellow arrows of the following screenshot cut show:

Note

We can concatenate two animations with the on_complete event.

The following code fragment 1 (of 2) of fleet.py shows how to concatenate these events:

155. # File name: fleet.py (Fragment 1)
156. from kivy.uix.gridlayout import GridLayout
157. from kivy.properties import ListProperty
158. from kivy.animation import Animation
159. from kivy.clock import Clock
160. from kivy.core.window import Window
161. from random import randint, random
162. from dock import Dock
163. 
164. class Fleet(GridLayout):
165.   survivors = ListProperty(())
166. 
167.   def __init__(self,  **kwargs):
168.     super(Fleet, self).__init__(**kwargs)
169.     for...