def update_mobject(self, alpha):
scaled = alpha*len(self.target_states)
try:
if scaled-1 > 0:
self.starting_mobject = self.target_states[int(scaled)-1]
self.ending_mobject = self.target_states[int(scaled)]
except IndexError:
self.ending_mobject = self.target_states[-1]
Transform.update_mobject(self, scaled%1)
return self
