Closed
Description
Bugreport
The zorder of artists is not being respected, when using blitting while creating an animation with FuncAnimation. The order in which the user-function returning artists that have to be adapted implicity set the order in which they are updated and thus artists may actually be covered by other artists with lower zorder (see example below).
Code for reproduction
import numpy as np
from matplotlib import pyplot as plt
from matplotlib import animation
fig = plt.figure()
ax = plt.axes(xlim=(0, 2), ylim=(-2, 2))
red_sine, = ax.plot([], [], lw=5, color="r", zorder=2)
green_sine, = ax.plot([], [], lw=2, color="g", zorder=3)
def init():
green_sine.set_data([], [])
red_sine.set_data([], [])
return green_sine, red_sine,
def ani(time):
x = np.linspace(0, 2, 1000)
y = np.sin(2 * np.pi * (x - 0.01 * time))
green_sine.set_data(x, y)
red_sine.set_data(x, y)
return green_sine, red_sine,
anim = animation.FuncAnimation(fig, ani, init_func=init, frames=100, interval=2, blit=True)
plt.show()Note: When adding pictures i noticed, that using the GUI-Buttons for saving yield expected results. On screen however results are as shown below. I briefly switched backends to 'TkAgg' without improvement.
Actual outcome
Expected outcome
Matplotlib version
- Operating system: Windows 7
- Matplotlib version: 2.2.2
- Matplotlib backend: Qt5Agg
- Python version: 3.5.5
(virtual env via conda)