python – Matplotlib FuncAnimation慢
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![python – Matplotlib FuncAnimation慢](/upload/InfoBanner/zyjiaocheng/778/5132465b7cf9496ca24cf2354769f49d.jpg)
我使用matplotlib的FuncAnimation创建了一个表面绑定过程的简单动画.结果却非常缓慢.我怀疑是因为我正在重绘每一帧的所有元素,但我还没有找到解决办法.任何帮助赞赏.
import matplotlib
matplotlib.use('TKAgg') # import proper graphics back-end for Mac OS X
import numpy as np
from matplotlib import pyplot as plt
from matplotlib import animation
from matplotlib.collections import PatchCollection
from random import *
nx = 20 # x size of lattice
ny = 20 # y size of lattice
pAds = 0.01 # adsorption probability per time step
pDes = 0.0075 # desorption probability per time step
tMax = 500 # number of time steps
surface = np.zeros((nx,ny)) # create surface
xc = [0]
yc = [0]
# initialization and time step of simulation
def init():
# initialize an empty list of circles
patches = [] # empty array to hold drawable objects
for x in range(0,nx):
for y in range(0,ny):
if(surface[x][y] == 0):
patches.append(ax_surf.add_patch(plt.Circle((x+0.5,y+0.5),0.45,color='w')))
lines, = ax_covr.plot([],[])
patches.append(lines)
return patches
def animate(i):
patches = [] # empty array of circles to be drawn
for x in range(0,nx):
for y in range(0,ny):
if(surface[x][y] == 0):
if(random() < pAds):
surface[x][y] = 1
patches.append(ax_surf.add_patch(plt.Circle((x+0.5,y+0.5),0.45,color='b')))
else:
patches.append(ax_surf.add_patch(plt.Circle((x+0.5,y+0.5),0.45,color='w')))
else:
if(random()<pDes):
surface[x][y] = 0
patches.append(ax_surf.add_patch(plt.Circle((x+0.5,y+0.5),0.45,color='w')))
else:
patches.append(ax_surf.add_patch(plt.Circle((x+0.5,y+0.5),0.45,color='b')))
coverage = np.sum(surface)/(nx*ny)
xc.append(i)
yc.append(coverage)
lines, = ax_covr.plot(xc,yc,'ro',ms=2,lw=0)
patches.append(lines)
return patches
# set up figure and animate
fig = plt.figure()
ax_surf = plt.subplot2grid((1, 2), (0, 0))
ax_covr = plt.subplot2grid((1, 2), (0, 1))
ax_surf.set_xlim(0,nx)
ax_surf.set_ylim(0,ny)
ax_covr.set_xlim(0,tMax)
ax_covr.set_ylim(0,1)
ax_surf.set_aspect(1)
ax_surf.axis('off')
ax_covr.set_aspect(tMax)
ax_surf.hold(False)
anim = animation.FuncAnimation(fig, animate, init_func=init, frames=tMax, interval=0, blit=True,repeat=False)
plt.show()
解决方法:
使用先前init / animate调用的补丁而不是每次都创建新补丁.
以下是代码的修改版本.
patches = []
def init():
global patches
if patches:
# prevent the second call of the init()
return patches
# initialize an empty list of circles
for x in range(nx):
for y in range(ny):
if(surface[x][y] == 0):
patches.append(ax_surf.add_patch(plt.Circle((x+0.5,y+0.5),0.45,color='w')))
lines, = ax_covr.plot([],[])
patches.append(lines)
return patches
def animate(i):
global patches
idx = 0
for x in range(nx):
for y in range(ny):
if surface[x][y] == 0:
if random() < pAds:
surface[x][y] = 1
patches[idx] = ax_surf.add_patch(plt.Circle((x+0.5,y+0.5),0.45,color='b'))
else:
if(random()<pDes):
surface[x][y] = 0
patches[idx] = ax_surf.add_patch(plt.Circle((x+0.5,y+0.5),0.45,color='w'))
idx += 1
coverage = np.sum(surface)/(nx*ny)
xc.append(i)
yc.append(coverage)
lines, = ax_covr.plot(xc,yc,'ro',ms=2,lw=0)
patches[idx] = lines
return patches
注意:使用全局变量来最小化修改.
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