Re: [Matplotlib-users] How to determine position of axes after imshow?

[Stan W. <sta...@nr...>]

From: Mark Bakker [mailto:ma...@gm...] 
Sent: Tuesday, August 07, 2012 06:42
 
I tried a few things and found out that doing a pause works. 
So why does a pause work, but a draw() or show() does not?
This all on Windows using the standard PythonXY installation.
Here is the code that works (testimage.py):


from pylab import *
c = ones((10,20))
ax = imshow(c)
pause(0.01)
print ax.get_axes().get_position()


Running from IPython: 
run testimage
Bbox(array([[ 0.125     ,  0.24166667],
       [ 0.9       ,  0.75833333]]))

I modified your script to test show(), draw(), and pause(); it's attached. For
the WXAgg matplotlib backend, I get:

In [1]: print(matplotlib.get_backend())
WXAgg
In [2]: %run testimage
show:  Bbox(array([[ 0.125,  0.1  ],
       [ 0.9  ,  0.9  ]]))
draw:  Bbox(array([[ 0.125     ,  0.24166667],
       [ 0.9       ,  0.75833333]]))
pause:  Bbox(array([[ 0.125     ,  0.24166667],
       [ 0.9       ,  0.75833333]]))

but for the Qt4Agg backend, I get:

In [1]: print(matplotlib.get_backend())
Qt4Agg
In [2]: %run testimage
show:  Bbox(array([[ 0.125,  0.1  ],
       [ 0.9  ,  0.9  ]]))
draw:  Bbox(array([[ 0.125,  0.1  ],
       [ 0.9  ,  0.9  ]]))
pause:  Bbox(array([[ 0.125     ,  0.24166667],
       [ 0.9       ,  0.75833333]]))

Which backend have you been using?