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I am trying to create a simple animation using Cartopy. Basically just drawing a few lines in the map. So far I am trying the following:

import matplotlib.pyplot as plt
import cartopy.crs as ccrs
import matplotlib.animation as animation
import numpy as np

ax = plt.axes(projection=ccrs.Robinson())
ax.set_global()
ax.coastlines()

lons = 10 * np.arange(1, 10)
lats = 10 * np.arange(1, 10)

def animate(i):

    plt.plot([lons[i-1], lons[i]], [lats[i-1], lats[i]], color='blue', transform=ccrs.PlateCarree())
    return plt

anim = animation.FuncAnimation(plt.gcf(), animate, frames=np.arange(1, 8), init_func=None, interval=2000, blit=True)

plt.show()

Does anyone know why this is not working?

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1 回答 1

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我猜这与cartopy无关。问题是您不能从动画函数返回 pyplot。（这就像你不买书，而是买了整个书店，然后想知道为什么你不能读书店。）

最简单的解决方案是关闭 blitting：

import matplotlib.pyplot as plt
import matplotlib.animation as animation
import numpy as np

fig, ax = plt.subplots()

lons = 10 * np.arange(1, 10)
lats = 10 * np.arange(1, 10)

def animate(i):
    plt.plot([lons[i-1], lons[i]], [lats[i-1], lats[i]], color='blue')

anim = animation.FuncAnimation(plt.gcf(), animate, frames=np.arange(1, 8), 
                               init_func=None, interval=200, blit=False)

plt.show()

如果出于某种原因需要进行 blitting（如果动画太慢或消耗过多 CPU 就会出现这种情况），则需要返回要绘制的 Line2D 对象的列表。

import matplotlib.pyplot as plt
import matplotlib.animation as animation
import numpy as np

fig, ax = plt.subplots()

lons = 10 * np.arange(1, 10)
lats = 10 * np.arange(1, 10)
lines = []

def animate(i):
    line, = plt.plot([lons[i-1], lons[i]], [lats[i-1], lats[i]])
    lines.append(line)
    return lines

anim = animation.FuncAnimation(plt.gcf(), animate, frames=np.arange(1, 8), 
                               interval=200, blit=True, repeat=False)

plt.xlim(0,100) #<- remove when using cartopy
plt.ylim(0,100)
plt.show()
于 2017-03-09T13:49:01.873 回答