我想使用Python保存动画，但是我得到了叠加的帧！我想单独显示框架。请在这里我用过的：
import numpy as np
from matplotlib import pyplot as plt
from matplotlib import animation
from numpy import pi, cos, sin
fig = plt.figure()
plt.axis([-1.5, 1.5,-1.5, 1.5])
ax = plt.gca()
ax.set_aspect(1)
N=100
xp = [None] * N
yp = [None] * N
def init():
# initialize an empty list of cirlces
return []
def animate(i):
xp[i]=sin(i*pi/10)
yp[i]=cos(i*pi/10)
patches = []
patches.append(ax.add_patch( plt.Circle((xp[i],yp[i]),0.02,color='b') ))
return patches
anim = animation.FuncAnimation(fig, animate, init_func=init,
frames=N-1, interval=20, blit=True)
anim.save("example.avi")
plt.show()
有些事情我不确定，实际上似乎是axis.plot（）行为和FuncAnimate（）行为是不同的。但是，下面的代码对两者都适用。
您的代码的关键点在于，每次迭代时，除了旧的圆之外，您还添加了一个新的圆：
patches = []
patches.append(ax.add_patch( plt.Circle((xp[i],yp[i]),0.02,color='b') ))
即使清除了修补程序列表，它们仍存储在轴中。
相反，只需创建一个圆并更改其位置即可。
init()另外，init()需要从底架上清除补丁。
from matplotlib import pyplot as plt
from matplotlib import animation
from numpy import pi, cos, sin
fig = plt.figure()
plt.axis([-1.5, 1.5, -1.5, 1.5])
ax = plt.gca()
ax.set_aspect(1)
N = 100
xp = []
yp = []
# add one patch at the beginning and then change the position
patch = plt.Circle((0, 0), 0.02, color='b')
ax.add_patch(patch)
def init():
patch.set_visible(False)
# return what you want to be cleared when axes are reset
# this actually clears even if patch not returned it so I'm not sure
# what it really does
return tuple()
def animate(i):
patch.set_visible(True) # there is probably a more efficient way to do this
# just change the position of the patch
x, y = sin(i*pi/10), cos(i*pi/10)
patch.center = x, y
# I left this. I guess you need a history of positions.
xp.append(x)
yp.append(y)
# again return what you want to be cleared after each frame
# this actually clears even if patch not returned it so I'm not sure
# what it really does
return tuple()
anim = animation.FuncAnimation(fig, animate, init_func=init,
frames=N-1, interval=20, blit=True)
# for anyone else, if you get strange errors, make sure you have ffmpeg
# on your system and its bin folder in your path or use whatever
# writer you have as: writer=animation.MencoderWriter etc...
# and then passing it to save(.., writer=writer)
anim.save('example.mp4')
plt.show()
关于返回值init()和animate()，这似乎并不重要返回什么。单个补丁仍然可以移动并正确绘制，而无需清除先前的补丁。
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