Matplotlib动画:使用blit时,第一帧仍保留在画布中

Question

我正在尝试使用Matplotlib动画库绘制两个旋转椭圆,我设法让它工作(或多或少).问题是正在渲染的第一帧不会更新,所以当我在画布中有两个旋转椭圆时,我也有原始位置/方向的椭圆.看看我简单的代码:

import matplotlib.pyplot as plt
from matplotlib.patches import Ellipse
from matplotlib import animation

fig = plt.figure()
ax = fig.add_subplot(111, aspect='equal')
e1 = Ellipse(xy=(0.5, 0.5), width=0.5, height=0.2, angle=60)
e2 = Ellipse(xy=(0.8, 0.8), width=0.5, height=0.2, angle=100)

def init():
    ax.add_patch(e1)
    ax.add_patch(e2)
    return [e1,e2]

def animate(i):
    e1.angle = e1.angle + 0.5
    e2.angle = e2.angle + 0.5
    return [e1,e2]

anim = animation.FuncAnimation(fig, animate, init_func=init, interval=1, blit=True)
plt.show()

知道如何解决这个问题吗？我当然可以关闭blit,但这会让它变得非常慢,所以这不是一个真正的选择.

编辑:最终(工作)代码

import matplotlib.pyplot as plt
from matplotlib.patches import Ellipse
from matplotlib import animation

fig = plt.figure()
ax = fig.add_subplot(111, aspect='equal')
e1 = Ellipse(xy=(0.5, 0.5), width=0.5, height=0.2, angle=60)
e2 = Ellipse(xy=(0.8, 0.8), width=0.5, height=0.2, angle=100)
ax.add_patch(e1)
ax.add_patch(e2)

def init():
    e1.set_visible(False)
    e2.set_visible(False)
    return [e1,e2]

def animate(i):
    if i == 1:
        e1.set_visible(True)
        e2.set_visible(True)
    e1.angle = e1.angle + 0.5
    e2.angle = e2.angle + 0.5
    return [e1,e2]

anim = animation.FuncAnimation(fig, animate, init_func=init, interval=1, blit=True)
plt.show()

Answer 1

尝试这个：

import matplotlib.pyplot as plt
from matplotlib.patches import Ellipse
from matplotlib import animation

fig = plt.figure()
ax = fig.add_subplot(111, aspect='equal')
e1 = Ellipse(xy=(0.5, 0.5), width=0.5, height=0.2, angle=60)
e2 = Ellipse(xy=(0.8, 0.8), width=0.5, height=0.2, angle=100)


def init():
    return [ax]

def animate(i):
    if i==0:
        ax.add_patch(e1)
        ax.add_patch(e2)    
    e1.angle = e1.angle + 0.5
    e2.angle = e2.angle + 0.5
    return [e1,e2]

anim = animation.FuncAnimation(fig, animate, init_func=init, interval=1, blit=True)
plt.show()

尝试另一种方法（不是我只使用一个椭圆来进行测试，它在这里也渲染得很好）：

import matplotlib.pyplot as plt
from matplotlib.patches import Ellipse
from matplotlib import animation

fig = plt.figure()
ax = fig.add_subplot(111, aspect='equal')
e1 = Ellipse(xy=(0.5, 0.5), width=0.5, height=0.2, angle=60)
ax.add_patch(e1)

def init():
    e1.set_visible(False)
    return e1,

def animate(i):
    if i==0:
        e1.set_visible(True)
    e1.angle = e1.angle + 0.5
    return e1,

anim = animation.FuncAnimation(fig, animate, init_func=init, interval=1, blit=True)
plt.show()