Hello,
Attached is a script that when run from ipython --pylab with your
backend setup for 'QtAgg' reproduces a bug I am seeing. If you run the
plot, you'll see a line plotted in blue as expected. Then when the
same figure is updated by blitting, the line turns red. I tried this
with green and it stayed green, but yellow went to cyan. It seems that
the byteswapping that is necessary for displaying colors correctly in
Qt is happening during a normal plot, but not when blitting. I tried
going through the code to determine the problem, I can only guess that
it lies somewhere in the FigureCanvasQTAgg.paintEvent, since that's
where I see to_ARGB etc.
Sorry I couldn't locate the bug precisely, I find it very difficult to
thread my way through all the backend classes.
Glenn
import matplotlib
matplotlib.use('QtAgg')
import pylab
import time
pylab.ion()
f = pylab.figure()
ax = f.add_subplot(111)
line, = ax.plot([1,2,3])
pylab.show()
time.sleep(1)
bbox = f.bbox
bg = f.canvas.copy_from_bbox(bbox)
time.sleep(1)
f.canvas.restore_region(bg)
time.sleep(1)
line.set_ydata([3,2,1])
ax.draw_artist(line)
f.canvas.blit(bbox)
time.sleep(1)
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