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I'm running latest master of matplotlib to enable animations with the Agg backend through cairocffi, but am having issues with multiple subplots.
Here is some modified code from the examples to show the issue:
# Modified example from http://matplotlib.org/examples/animation/simple_anim.html
import numpy as np
import matplotlib as mpl
import matplotlib.animation as animation
from matplotlib.backends.backend_gtk3agg import FigureCanvasGTK3Agg as FigureCanvas
from gi.repository import Gtk
class TestWindow(Gtk.Window):
def __init__(self):
Gtk.Window.__init__(self)
self.resize(600, 400)
figure = mpl.figure.Figure()
canvas = FigureCanvas(figure)
self.add(canvas)
self.show_all()
x = np.arange(0, 2*np.pi, 0.01)
ax1 = figure.add_subplot(121)
line1, = ax1.plot(x, np.sin(x))
ax2 = figure.add_subplot(122)
line2, = ax2.plot(x, np.sin(x))
def animate(i):
line1.set_ydata(np.sin(x+i/10.0))
line2.set_ydata(np.sin(x+i/10.0))
return line1,# line2
def init():
line1.set_ydata(np.ma.array(x, mask=True))
line2.set_ydata(np.ma.array(x, mask=True))
return line1,# line2
self.ani = animation.FuncAnimation(figure, animate, np.arange(1, 200), init_func=init,
interval=25, blit=True)
if __name__ == "__main__":
win = TestWindow()
win.connect("delete-event", Gtk.main_quit)
Gtk.main()This works until the init() and animate() functions return more than one line (uncomment the return values to checck).
I could trace the call back to FigureCanvasGTK3Agg.blit() in backend_gtk3agg.py. Line 90 is the last one called and throws a segmentation fault.
This happens on Ubuntu 12.04, 13.10 and 14.04. Both with Python 2 and Python 3.
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