Re: [matplotlib-devel] Bugs in close('all') with the TkAgg backend

[Fernando P. <Fer...@co...>]

Fernando Perez wrote:

> OK, a bit more info.  It turns out that the crash happens whenever the _first_ 
> figure window is deleted with a close(fignum) command.  So in order to really 
> block the problem, I had to create a dummy 'sentinel' window, numbered -666, 
> for which close() is never called.  It's OK to close this window via the 
> window manager by clicking on its close button, but pylab.close() must NEVER 
> be called on it.  The current code looks like this:

More info, sorry about the noise.  It's NOT OK to close the sentinel in any 
way whatsoever, even via the window manager.  If this window is closed, 
through any mechanism, Tk/VTK is hosed.

This is what you get on screen if you close the very first Tk figure window, 
once MayaVi has run and made a figure:

In [8]: Generic Warning: In
/usr/local/installers/src/vtk/VTK/Rendering/vtkTkRenderWidget.cxx, line 633
A TkRenderWidget is being destroyed before it associated vtkRenderWindow is
destroyed. This is very bad and usually due to the order in which objects are
being destroyed. Always destroy the vtkRenderWindow before destroying the user
interface components.


Any attempt to use mayavi afterwards produces this traceback:

---------------------------------------------------------------------------
_tkinter.TclError                                  Traceback (most recent call
last)

/home/sandberg/WavePropagation3D/Codes/Test/wave1DTEST.py
     269 mm.title('Non-projected D2 wrt prolates')
     270
--> 271 imv.surf(range(nnod),range(nnod),255*improc.mat2gray(D2p))
     272
     273

/usr/lib/python2.3/site-packages/mayavi/tools/imv.py in surf(x, y, z, warp,
scale, viewer, f_args, f_keyw)
     267     # do the mayavi stuff.
     268     if not viewer:
--> 269         v = mayavi.mayavi()
     270     else:
     271         v = viewer

/usr/lib/python2.3/site-packages/mayavi/Main.py in mayavi(geometry)
    1826     t = Tkinter.Toplevel (r)
    1827     t.withdraw ()
-> 1828     app = MayaViTkGUI (t, geometry)
    1829     return app
    1830

/usr/lib/python2.3/site-packages/mayavi/Main.py in __init__(self, master,
geometry)
     918         self.renwin_frame = Tkinter.Frame (master_f)
     919         self.renwin_frame.pack (side='left', fill='both', expand=1)
--> 920         self.renwin = Misc.RenderWindow.RenderWindow (self.renwin_frame)
     921         self.renwin.Render ()
     922

/usr/lib/python2.3/site-packages/mayavi/Misc/RenderWindow.py in __init__(self,
master)
      86         else:
      87             tkw = vtkRenderWidget.vtkTkRenderWidget (self.frame,
width=600,
---> 88                                                      height=505)
      89         self.tkwidget = tkw
      90         self.tkwidget.pack (expand='true',fill='both')

/usr/local/lib/python2.3/site-packages/vtk_python/vtk/tk/vtkTkRenderWidget.py in
__init__(self, master, cnf, **kw)
     104
     105         kw['rw'] = renderWindow.GetAddressAsString("vtkRenderWindow")
--> 106         Tkinter.Widget.__init__(self, master, 'vtkTkRenderWidget', cnf,
kw)
     107
     108         self._CurrentRenderer = None

/usr/src/build/475206-i386/install/usr/lib/python2.3/lib-tk/Tkinter.py in
__init__(self, master, widgetName, cnf, kw, extra)
    1833                 classes.append((k, cnf[k]))
    1834                 del cnf[k]
-> 1835         self.tk.call(
    1836             (widgetName, self._w) + extra + self._options(cnf))
    1837         for k, v in classes:

TclError: invalid command name "vtkTkRenderWidget"


More interestingly, this leaves python in some very strange state.  If you 
close ipyhton, instead of a system prompt you get the '>>>' python prompt, but 
you can't execute _anything_ there.  Even a simple '1+1' fails, all you can do 
is quit.  So basically the closing of that first matplotlib figure window is 
destroying enough in the python internals to render it completely unusable.

Regards,

f