So I rebuilt Python so that I would have Tkinter support, and using
TkAgg I get the behavior I want, so it's not mission critical to me to
figure this out anymore. But if anyone is interested in tracking it
down I will be glad to help.

On Wed, Sep 26, 2012 at 8:06 AM, Craig the Demolishor
<destrooo...@gmail.com> wrote:
> Hi all,
>   I've been having some trouble getting interactive mode to work
> correctly with the WxAgg backend. I have these versions:
>
> [craigb@xxxxxx hists]$ python
> Python 2.7.3 (default, Aug 13 2012, 16:13:38)
> [GCC 4.1.2 20080704 (Red Hat 4.1.2-52)] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
>>>> import matplotlib
>>>> matplotlib.__version__
> '1.1.1rc'
>>>> import wx
>>>> wx.__version__
> '2.8.12.1'
>>>>
>
>
> When I do something like this,
>
>>>> from matplotlib import pyplot
>>>> import numpy
>>>> pyplot.plot(numpy.arange(10), numpy.arange(10), 'r.')
> [<matplotlib.lines.Line2D object at 0x5561750>]
>>>> pyplot.show()
>
> I get a good-looking window with my plot. I can mouse over the window
> and get coordinates, there are buttons on the bottom of the window
> that I can push, etc. However, if I turn on interactive mode (I read
> somewhere that it's bad to turn on interactive mode after you've
> already made a plot, so below I've exited and started a new
> interactive session),
>
>>>> from matplotlib import pyplot
>>>> import numpy
>>>> pyplot.ion()
>>>> pyplot.plot(numpy.arange(10), numpy.arange(10), 'r.')
> [<matplotlib.lines.Line2D object at 0x153e2ad0>]
>
> Nothing shows at this point. If I continue,
>
>>>> pyplot.show()
>
> Still nothing shows. If I exit right now, I get a brief glimpse of my
> plot before python exits completely. I can get the plot to show by
> doing
>
>>>> pyplot.draw()
>
> But it's only the top half of the plot, and if I drag another window
> on top of it, it doesn't automatically redraw. No buttons, no
> mouse-over niceness. Issuing pyplot.draw() again gets me the full
> plot, but no mouse-overs, no buttons, and no redraw.
>
> Both MPL and wxPython were built from source on a RHEL5.8 machine, so
> maybe it's the libraries I am linking against...? Anyway, I've
> attached two screenshots of what my plots look like when they finally
> are drawn. Many many thanks in advance!
>
> --cb

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