Added ReconfigurableScene. Should make for fun times.

scene/reconfigurable_scene.py

@@ -0,0 +1,47 @@
+import numpy as np
+
+from scene import Scene
+from animation.transform import Transform
+
+from helpers import *
+
+class ReconfigurableScene(Scene):
+    CONFIG = {
+        "allow_recursion" : True,
+    }
+    def setup(self):
+        self.states = []
+        self.num_recursions = 0
+
+    def show_alt_config(self, return_to_original_configuration = True, **new_config):
+        original_state = self.get_mobjects()
+        state_copy = [m.copy() for m in original_state]
+        self.states.append(state_copy)
+        if not self.allow_recursion:
+            return
+        alt_scene = self.__class__(
+            skip_animations = True, 
+            allow_recursion = False,
+            **new_config
+        )
+        alt_state = alt_scene.states[len(self.states)-1]
+
+        if return_to_original_configuration:
+            self.clear()
+            self.transition_between_states(state_copy, alt_state)
+            self.transition_between_states(state_copy, original_state)
+            self.clear()
+            self.add(*original_state)
+        else:
+            self.transition_between_states(original_state, alt_state)
+            self.__dict__.update(new_config)
+
+    def transition_between_states(self, start_state, target_state):
+            self.play(*[
+                Transform(*pair)
+                for pair in zip(start_state, target_state)
+            ])
+            self.dither()
+
+
+