Hi all,
I recently bumped into a problem while trying to display imshow images (2048x2048 pix) in a GUI based on TkAgg (matplotib0.91.2, python 2.4.4, numpy1.0.4). In brief, building the image with imshow is Ok, but the call to show() or draw() takes about 1.2 s on my system (XP, 2.8Ghz, 2Go ram). After reading a lot of posts and trying out a few things, I turned to the Animation_blit_tk.py example and modified it accordingly (code attached below). In the end, the display is still not much faster using this method (still in the order of 1.2 s as indicated by the result below).
Could any one tel me whether I’m doing something wrong ?
As far as I understand, at least in my Tk GUI, the limiting step using the ImageTk.FigureCanvasTkAgg is the call to draw() or draw_artist(). I
read some comments from John regarding TkAgg being slow in some cases but couldn’t find a definite answer.
Any hint would be much appreciated…
Cheers,
Aure
···
For detailed comments on animation and the techniqes used here, see
the wiki entry http://www.scipy.org/Cookbook/Matplotlib/Animations
import matplotlib
matplotlib.use(‘TkAgg’)
import sys
import pylab as p
#import matplotlib.numerix as nx
import time
from FileUtils10 import fileHandling
for profiling
tstart = time.time()
tprevious = time.time()
fnamelist = [‘fname1’,‘fname2’,‘fname3’]
ax = p.subplot(111)
canvas = ax.figure.canvas
print 't1 ',time.time()-tprevious
tprevious = time.time()
create the initial line
dataarr = fileHandling(fnamelist[0]).readSpecial()
#print dataarr.dtype => numpy dtype uint16
#dataarr =
dataarr.astype(‘uint8’)
print 't2 ',time.time()-tprevious
tprevious = time.time()
image = p.imshow(dataarr, animated=True)
print 't3 ',time.time()-tprevious
tprevious = time.time()
def run(*args):
tprevious = time.time()
background = canvas.copy_from_bbox(ax.bbox)
print 't4 ',time.time()-tprevious
tprevious = time.time()
while 1:
#print fnamelist[run.cnt]
# restore the clean slate background
canvas.restore_region(background)
print 't5 ',time.time()-tprevious
tprevious = time.time()
# update the data
dataarr = fileHandling(fnamelist[run.cnt]).readSpecial()
print 't6 ',time.time()-tprevious
tprevious = time.time()
image.set_data(dataarr)
print 't7 ',time.time()-tprevious
tprevious = time.time()
# just draw the animated artist
ax.draw_artist(image)
print 't8 ',time.time()-tprevious
tprevious = time.time()
# just redraw the axes rectangle
canvas.blit(ax.bbox)
print 't9 ',time.time()-tprevious
tprevious = time.time()
if fnamelist[run.cnt] == fnamelist[-1]:
# print the timing info and quit
print 'total time:' , time.time()-tstart
print 'FPS:' , 1000./(time.time()-tstart)
p.close('all')
sys.exit()
run.cnt += 1
run.cnt = 0
p.subplots_adjust(left=0.3, bottom=0.3) # check for flipy bugs
p.grid() # to ensure proper background restore
manager = p.get_current_fig_manager()
manager.window.after(100, run)
p.show()
====
Results in:
t1 0.858999967575
t2
0.0320000648499
t3 1.31299996376
t4 0.0
t5 0.0
t6 0.0310001373291
t7 0.0
t8 1.18700003624
t9 0.0160000324249
t5 0.0
t6 0.0469999313354
t7 0.0
t8 1.17200016975
t9 0.0149998664856
t5 0…0
t6 0.047000169754
t7 0.0
t8 1.21899986267
t9 0.0
t5 0.0
t6 0.0460000038147
t7 0.0
t8 1.17199993134
t9 0.0
t5 0.0
t6 0.0469999313354
t7 0.0
t8 1.18700003624
t9 0.0160000324249
total time: 8.75
FPS: 114.285714286