Matplotlib动画：使用blit时，第一帧保留在画布中(Matplotlib animation: first frame remains in canvas when using blit)

Matplotlib动画：使用blit时，第一帧保留在画布中(Matplotlib animation: first frame remains in canvas when using blit)

我试图使用Matplotlib动画库绘制两个旋转椭圆，并且设法让它工作（或多或少）。 问题是正在渲染的第一帧没有更新，所以虽然在画布中有两个旋转椭圆，但我也有椭圆在原始位置/方向。 看看我的一段简单的代码：

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()

任何想法如何解决这个问题？ 我当然可以关闭blit，但这会让它非常慢，所以这不是一个真正的选择。

谢谢！

编辑：最后（工作）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) 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()

I'm trying to plot two rotating ellipses using the Matplotlib animation library, and I managed to get it working (more or less). The problem is that the first frame that is being rendered does not update, so while I got two rotating ellipses in my canvas, I also have the ellipses in their original position/orientation. Check out my simple piece of code:

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()

Any idea how to fix this? I could of course turn off blit, but that makes it horribly slow, so that's not really an option.

EDIT: Final (working) Code

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()

最满意答案

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()

试试这种方法（不是我只用一个椭圆来测试，它在这里也很好）：

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()

Try this:

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()

Try this other approach (not I've used only one ellipse just for testing, it also renders fine here):

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()