[IPython-dev] Detecting GUI mainloop running in IPython
Sun Jul 25 16:25:00 CDT 2010
On Sun, Jul 25, 2010 at 2:05 PM, Eric Firing <firstname.lastname@example.org> wrote:
> On 07/25/2010 10:56 AM, Gael Varoquaux wrote:
> > On Sun, Jul 25, 2010 at 10:35:02AM -1000, Eric Firing wrote:
> >> Although ipython has provided invaluable service to mpl by enabling
> >> interactive plotting for all gui backends, I am not at all sure that
> >> this functionality should be left to ipython in the long run. The
> >> problem is that mpl is used in a variety of ways and environments. Gui
> >> functionality is central to mpl; it seems odd, and unnecessarily
> >> complicated, to have to delegate part of that to an environment, or
> >> shell, like ipython.
> > Wow, I just did a little experiment, and I really don't understand the
> > outcome. Please bear with me:
> > $ ipython
> > In : !cat /home/varoquau/.matplotlib/matplotlibrc
> > backend : GtkAgg
> > In : from pylab import *
> > In : ion()
> > In : plot([1,2,3])
> > Out: [<matplotlib.lines.Line2D object at 0xccb4dac>]
> > In : from enthought.mayavi import mlab
> > In : mlab.test_surf()
> > Out:<enthought.mayavi.modules.surface.Surface object at 0xd58ce0c>
> > Two things I do not understand:
> > 1) I can interact alright with the Mayavi plot, nice and fine
> > eventhough there is not wx event-loop running, and I did not
> > register a InputHook
> > 2) I did not get a segfault, while I am running at the same time GTK
> > and Wx. This used to be a big no no.
> > I believe that 1 is due to matplotlib registering an InputHook, but I
> > cannot find where it is done. Also, does this seems to mean that under
> > Linux GTK input hooks work for Wx (and they are nicer since they don't
> > poll).
> No, mpl is not registering an InputHook, but pygtk is. Maybe this is
> having a side effect because wx on linux is a wrapper around gtk.
> To get a hook registered explicitly for wx, you need to use "ipython
> --gui wx"
I should clarify. All IPython is doing in 0.11 for qt4, gtk and tk is to
tell each GUI toolkit to install its inputhook. Here is the gtk version:
Part of the difficulty is that each GUI toolkits has a different API for
doing this. We make the API uniform and add a wx inputhook using ctypes.
> > Anyhow, this is good news, eventhough I don't understand it at all.
> > Gaël
> IPython-dev mailing list
Brian E. Granger, Ph.D.
Assistant Professor of Physics
Cal Poly State University, San Luis Obispo
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