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Matplotlib QtAgg backend animation freezes #177
Description
Original report at SourceForge, opened Sun Nov 21 10:17:12 2010
Animation doesn't work in matplotlib with QtAgg backend. You should call QApplication.processEvents(), in draw() for that backend.
from PyQt4.QtGui import QApplication
import matplotlib
from pylab import *
from time import *
x = arange(5)
y = arange(5)
ion()
hold(False)
plot(x,y)
z = array(transpose(matrix(y))*matrix(x))
p = imshow(z)
for i in xrange(5):
z = z + 2
p.set_data(z)
clim()
draw()
QApplication.processEvents() #otherwise animation freezes. draw() should call that.
print "step"
sleep(1)
Activity
efiring commented on Jun 21, 2011
This is not really a bug, and I don't think the suggested change is needed.
You can use gcf().canvas.flush_events() to force the event loop to run.
draw() is calling update(), which is what it should do. The real problem is
that this is not a good way to try to do animation. To make simple
pyplot-level animation easier, I have made a new pause() function which I
think provides a reasonably clean solution.