I am trying to save the frames from a matplotlib animation and I have a
question that is undoubtedly based on a profound lack of understanding about
how matplotlib/python works, but I'm hoping someone can offer me an
explanation. The following code is excerpted from the animation examples
"animation_blit_wx.py". The example works fine unless I include the #*****
line meant to record the animations in included. If the line is included, the
animated line is no longer drawn to the screen or to the sequence of plots I am
trying to save. That is, the background is displayed and saved, but not the
animated line. Why?
def update_line(*args):
global blit_time
if update_line.background is None:
update_line.background = canvas.copy_from_bbox(ax.bbox)
# restore the clean slate background
canvas.restore_region(update_line.background)
# update the data
line.set_ydata(npy.sin(x+update_line.cnt/10.0))
# just draw the animated artist
ax.draw_artist(line)
# just redraw the axes rectangle
t = time.time()
canvas.blit(ax.bbox)
blit_time += time.time() - t
#***** plt.savefig('f' + str(update_line.cnt) + '.png') *****
if update_line.cnt == NBLITS:
# print the timing info and quit
frame_time = time.time() - tstart
print '%d frames: %.2f seconds' % (NBLITS, frame_time)
print '%d blits: %.2f seconds' % (NBLITS, blit_time)
print
print 'FPS: %.2f' % (NBLITS/frame_time)
print 'BPS: %.2f' % (NBLITS/blit_time)
sys.exit()
update_line.cnt += 1
wx.WakeUpIdle()
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