python - 我的 matplotlib ArtistAnimation 做错了什么？

Question

我尝试使用以下代码创建动画，但无法让它工作。

def plotSimulation(currentState, startState):
   import matplotlib.pyplot as plt
   import matplotlib.animation as ani
   import numpy as np
   import matplotlib.patches as mpatches
   import matplotlib.collections as collections

   fig1 = plt.figure()
   ax = plt.subplot()

   numberOfFrames = currentState.shape[2]


   frames = []

   for frame in np.arange(numberOfFrames):
      carPatches = []
      for car in range(0, currentState.shape[0]):
          carPatches.append(mpatches.Rectangle([currentState[car,0,frame],currentState[car,1,frame]], startState[car, 2], startState[car, 3], angle=startState[car, 4]))
      carCollection = collections.PatchCollection(carPatches)
      frames.append((carCollection,))


   simulationAnimation = ani.ArtistAnimation(fig1, frames, interval=50, repeat_delay=300, blit=False)

   plt.show()

我尝试从这个例子复制http://matplotlib.org/examples/animation/basic_example.html

动画如图2所示

但是当我尝试运行我的动画时，我得到:

File "...plotIteration.py", line 24, in plotSimulation
  simulationAnimation = ani.ArtistAnimation(fig1, frames, interval=50, repeat_delay=300, blit=False)

File ".../python/matplotlib/animation.py", line 934, in __init__
  TimedAnimation.__init__(self, fig, *args, **kwargs)

File ".../python/matplotlib/animation.py", line 878, in __init__
  *args, **kwargs)

File ".../python/matplotlib/animation.py", line 559, in __init__
  self._init_draw()

File ".../Frameworks/Python.framework/Versions/2.7/Extras/lib/python/matplotlib/animation.py", line 948, in _init_draw
  ax.figure.canvas.draw()

AttributeError: 'NoneType' object has no attribute 'figure'

Answer 1

我认为问题是您已经创建了 PatchCollections，但尚未将它们添加到轴中。您应该可以使用 ax.add_collection 来执行此操作

尝试将 carCollection 附加到 frames 的行更改为:

frames.append(ax.add_collection(carCollection))