Finished Tau Poem

animation/animation.py

@@ -68,9 +68,9 @@ class Animation(object):
 
     def update(self, alpha):
         if alpha < 0:
-            alpha = 0
+            alpha = 0.0
         if alpha > 1:
-            alpha = 1
+            alpha = 1.0
         self.update_mobject(self.alpha_func(alpha))
 
     def filter_out(self, *filter_functions):
@@ -111,5 +111,40 @@ class Animation(object):
         self.update(1)
 
 
+class Succession(Animation):
+    def __init__(self, *animations, **kwargs):
+        if "run_time" in kwargs:
+            run_time = kwargs.pop("run_time")
+        else:
+            run_time = sum([anim.run_time for anim in animations])
+        self.num_anims = len(animations)
+        self.anims = animations
+        mobject = animations[0].mobject
+        Animation.__init__(self, mobject, run_time = run_time, **kwargs)
+
+    def __str__(self):
+        return self.__class__.__name__ + \
+               "".join(map(str, self.anims))
+
+    def update(self, alpha):
+        scaled_alpha = alpha*self.num_anims
+        self.mobject = self.anims
+        for index in range(len(self.anims)):
+            self.anims[index].update(scaled_alpha - index)
+
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