保存散点图动画

我一直在尝试使用 matplotlib 保存动画散点图，并且我希望它不需要完全不同的代码来查看动画图形和保存副本。该图完美显示了保存完成后的所有数据点。

这段代码是修改后的版本Giggi's https://stackoverflow.com/a/12741231/786020 on 在 matplotlib 中动画 3d 散点图 https://stackoverflow.com/questions/11376898/animating-3d-scatterplot-in-matplotlib，修复了来自扬的回答 https://stackoverflow.com/a/8974087/786020 on Matplotlib 3D散点颜色重绘后丢失 https://stackoverflow.com/questions/8971309/matplotlib-3d-scatter-color-lost-after-redraw（因为颜色对我的视频很重要，所以我想确保它们有效）。

import matplotlib.pyplot as plt
import matplotlib.animation as animation
import numpy as np
from mpl_toolkits.mplot3d import Axes3D

FLOOR = -10
CEILING = 10

class AnimatedScatter(object):
    def __init__(self, numpoints=5):
        self.numpoints = numpoints
        self.stream = self.data_stream()
        self.angle = 0

        self.fig = plt.figure()
        self.fig.canvas.mpl_connect('draw_event',self.forceUpdate)
        self.ax = self.fig.add_subplot(111,projection = '3d')
        self.ani = animation.FuncAnimation(self.fig, self.update, interval=100, 
                                       init_func=self.setup_plot, blit=True,frames=20)

    def change_angle(self):
        self.angle = (self.angle + 1)%360

    def forceUpdate(self, event):
        self.scat.changed()

    def setup_plot(self):
        X = next(self.stream)
        c = ['b', 'r', 'g', 'y', 'm']
        self.scat = self.ax.scatter(X[:,0], X[:,1], X[:,2] , c=c, s=200, animated=True)

        self.ax.set_xlim3d(FLOOR, CEILING)
        self.ax.set_ylim3d(FLOOR, CEILING)
        self.ax.set_zlim3d(FLOOR, CEILING)

        return self.scat,

    def data_stream(self):
        data = np.zeros(( self.numpoints , 3 ))
        xyz = data[:,:3]
        while True:
            xyz += 2 * (np.random.random(( self.numpoints,3)) - 0.5)
            yield data

    def update(self, i):
        data = next(self.stream)
        #data = np.transpose(data)

        self.scat._offsets3d = ( np.ma.ravel(data[:,0]) , np.ma.ravel(data[:,1]) , np.ma.ravel(data[:,2]) )

        plt.draw()
        return self.scat,

    def show(self):
        plt.show()

if __name__ == '__main__':
    a = AnimatedScatter()
    a.ani.save("movie.avi", codec='avi')
    a.show()

由此生成了一个完全有效的 .avi，但除了轴之外，它在所有四秒内都是空白的。实际的数字总是准确地显示出我想看到的内容。如何像填充正常运行的动画一样填充保存函数的绘图，或者在 matplotlib 中是否可以？

EDIT:在更新中使用分散调用（不设置初始化程序中的边界）会导致 .avi 显示轴增长，显示数据每次都在运行，只是没有显示在视频本身上。 我正在使用 matplotlib 1.1.1rc 和 Python 2.7.3。

Remove blit=True from FuncAnimation and animated=True from scatter它有效。我怀疑确保只有需要更新的艺术家在帧之间更新/重画（而不是仅仅重新绘制所有内容）的逻辑出了问题。

下面正是我运行的内容，我得到了预期的输出电影：

import matplotlib.pyplot as plt
import matplotlib.animation as animation
import numpy as np
from mpl_toolkits.mplot3d import Axes3D

FLOOR = -10
CEILING = 10

class AnimatedScatter(object):
    def __init__(self, numpoints=5):
        self.numpoints = numpoints
        self.stream = self.data_stream()
        self.angle = 0

        self.fig = plt.figure()
        self.fig.canvas.mpl_connect('draw_event',self.forceUpdate)
        self.ax = self.fig.add_subplot(111,projection = '3d')
        self.ani = animation.FuncAnimation(self.fig, self.update, interval=100, 
                                       init_func=self.setup_plot, frames=20)

    def change_angle(self):
        self.angle = (self.angle + 1)%360

    def forceUpdate(self, event):
        self.scat.changed()

    def setup_plot(self):
        X = next(self.stream)
        c = ['b', 'r', 'g', 'y', 'm']
        self.scat = self.ax.scatter(X[:,0], X[:,1], X[:,2] , c=c, s=200)

        self.ax.set_xlim3d(FLOOR, CEILING)
        self.ax.set_ylim3d(FLOOR, CEILING)
        self.ax.set_zlim3d(FLOOR, CEILING)

        return self.scat,

    def data_stream(self):
        data = np.zeros(( self.numpoints , 3 ))
        xyz = data[:,:3]
        while True:
            xyz += 2 * (np.random.random(( self.numpoints,3)) - 0.5)
            yield data

    def update(self, i):
        data = next(self.stream)
        self.scat._offsets3d = ( np.ma.ravel(data[:,0]) , np.ma.ravel(data[:,1]) , np.ma.ravel(data[:,2]) )
        return self.scat,

    def show(self):
        plt.show()

if __name__ == '__main__':
    a = AnimatedScatter()
    a.ani.save("movie.avi", codec='avi')
    a.show()