matplotlib怎样保存动态的gif图？

Question

有如下程序，怎样保存为gif的动态图？

import matplotlib.pyplot as plt
fig,ax=plt.subplots()
y1=[]
for i in range(50):
    y1.append(i)
    ax.cla()
    ax.bar(y1,label='test',height=y1,width=0.3)
    ax.legend()
    plt.pause(0.3)

https://segmentfault.com/q/10...

Answer 1

这里是官方的保存为mp4的案例，你可以参考一下。链接描述

"""
===================
Saving an animation
===================

This example showcases the same animations as `basic_example.py`, but instead
of displaying the animation to the user, it writes to files using a
MovieWriter instance.
"""

# -*- noplot -*-
import numpy as np
import matplotlib
matplotlib.use("Agg")
import matplotlib.pyplot as plt
import matplotlib.animation as animation


def update_line(num, data, line):
    line.set_data(data[..., :num])
    return line,

# Set up formatting for the movie files
Writer = animation.writers['ffmpeg']
writer = Writer(fps=15, metadata=dict(artist='Me'), bitrate=1800)


fig1 = plt.figure()

data = np.random.rand(2, 25)
l, = plt.plot([], [], 'r-')
plt.xlim(0, 1)
plt.ylim(0, 1)
plt.xlabel('x')
plt.title('test')
line_ani = animation.FuncAnimation(fig1, update_line, 25, fargs=(data, l),
                                   interval=50, blit=True)
line_ani.save('lines.mp4', writer=writer)

fig2 = plt.figure()

x = np.arange(-9, 10)
y = np.arange(-9, 10).reshape(-1, 1)
base = np.hypot(x, y)
ims = []
for add in np.arange(15):
    ims.append((plt.pcolor(x, y, base + add, norm=plt.Normalize(0, 30)),))

im_ani = animation.ArtistAnimation(fig2, ims, interval=50, repeat_delay=3000,
                                   blit=True)
im_ani.save('im.mp4', writer=writer)