[GRASS-user] Re: [GRASS-dev] empty map window/map rendering doesn't work (wxgui)

[Huidae Cho]

Martin and Michael,

After investing some time, I found a note in
swig-1.3.38/Tools/pyname_patch.py saying that they have renamed PySwig*
to SwigPy* since swig 1.3.37.  wxPython 2.8.9.2 (current stable version)
still uses old naming, so we have to stick to swig >= 1.3.31 and <=
1.3.36.  Now, GUI works great!

BTW, gui/wxpython/README says that swig is required only for the vector
digitizer, but I got the error below even at startup OnPaint events.  Am
I missing something?  Or is swig now required for the entire gui?

Thank you.
Huidae


On Sun, Mar 15, 2009 at 03:49:15PM -0700, Michael Barton wrote:
> 
> 
>    On Mar 15, 2009, at 3:19 PM, <[1]grass-dev-request at lists.osgeo.org>
>    wrote:
> 
>    From: Huidae Cho <[2]grass4u at gmail.com>
> 
>    Date: March 15, 2009 3:21:14 PM GMT-07:00
> 
>    To: [3]grass-dev at lists.osgeo.org
> 
>    Cc: [4]grass-user at lists.osgeo.org, Martin Landa
>    <[5]landa.martin at gmail.com>
> 
>    Subject: [GRASS-dev] empty map window/map rendering doesn't work
>    (wxgui)
> 
>      Hi,
>      I'm having a similar problem to this one after updating my
>      repository
>      (grass/trunk) yesterday.  I installed SWIG, wxPython (version
>      2.8.9.2),
>      and wxWidgets (version 2.8.9.2, --enable-graphics_ctx), but my Cairo
>      version is 1.4.10, which means no g.cairocomp.
>      My error message looks like this:
>      ----------------
>      Traceback (most recent call last):
>       File "/home/geni/usr/grass/grass-trunk/dist.i686-pc-linux-
>      gnu/etc/wxpython/gui_modules/mapdisp_window.py", line 448,
>      in OnPaint
>      self.pdc.DrawToDCClipped(dc, rgn)
>       File "/home/geni/usr/grass/grass-trunk/dist.i686-pc-linux-
>      gnu/etc/wxpython/vdigit/grass7_wxvdigit.py", line 384, in
>      DrawToDCClipped
>      def DrawToDCClipped(self, *args): return
>      _grass7_wxvdigit.PseudoDC_DrawToDCClipped(self, *args)
>      TypeError
>      :
>      in method 'PseudoDC_DrawToDCClipped', argument 2 of type
>      'void *'
>      Traceback (most recent call last):
>       File "/home/geni/usr/grass/grass-trunk/dist.i686-pc-linux-
>      gnu/etc/wxpython/gui_modules/mapdisp_window.py", line 540,
>      in OnIdle
>      self.UpdateMap(render=True)
>       File "/home/geni/usr/grass/grass-trunk/dist.i686-pc-linux-
>      gnu/etc/wxpython/gui_modules/mapdisp_window.py", line 665,
>      in UpdateMap
>      self.Draw(self.pdc, self.img, drawid=id)
>       File "/home/geni/usr/grass/grass-trunk/dist.i686-pc-linux-
>      gnu/etc/wxpython/gui_modules/mapdisp_window.py", line 264,
>      in Draw
>      pdc.SetBackground(bg)
>       File "/home/geni/usr/grass/grass-trunk/dist.i686-pc-linux-
>      gnu/etc/wxpython/vdigit/grass7_wxvdigit.py", line 374, in
>      SetBackground
>      def SetBackground(self, *args): return
>      _grass7_wxvdigit.PseudoDC_SetBackground(self, *args)
>      TypeError
>      :
>      in method 'PseudoDC_SetBackground', argument 2 of type
>      'wxBrush const &'
>      ----------------
>      I took a closer look at the code of _wrap_PseudoDC_DrawToDCClipped
>      (grass7_wxvdigit_wrap.cpp) and SWIG_IsOK, and SWIG_ConvertPtr
>      (swig-1.3.38/Lib/python/pyrun.swg).
>      To get the above error (i.e., !SWIG_IsOK(res2)),
>      SWIG_ConvertPtr(obj1,
>      SWIG_as_voidptrptr(&arg2), 0, 0) or
>      SWIG_Python_ConvertPtrAndOwn(obj1,
>      SWIG_as_voidptrptr(&arg2), 0, 0) should return a negative integer.
>      What
>      happens in SWIG_Python_ConvertPtrAndOwn is that it returns
>      SWIG_ERROR
>      (-1) when (obj1 is NULL) or (SWIG_Python_GetSwigThis(obj1) is NULL
>      and flags (the last argument, 0) is 0).
>      This error starts from self.pdc.DrawToDCClipped(dc, rgn) in
>      mapdisp_window.py, and obj1 is dc in this call.  Is dc NULL?  No, it
>      isn't.  "print dc" displays "<wx._gdi.BufferedPaintDC; proxy of
>      <Swig
>      Object of type 'wxBufferedPaintDC *' at 0x9427940> >".  Then, did
>      SWIG_Python_GetSwigThis return NULL?  Probably...
>      This error occurs even before calling gwxPseudoDC_DrawToDCClipped,
>      so I
>      think just chaning the prototype of DrawToDCClipped in pseudodc.i as
>      in
>      revision 36252 cannot solve this problem (and, actually, it didn't).
>      Could it be my wxWidget configure flags?  --enable-unicode
>      --enable-sound --enable-graphics_ctx --with-sdl --with-opengl
>      Any ideas?
>      Thanks.
>      Huidae
> 
>    I updated last night and am having no problems like this with 6.5 or 7
>    (on Mac OS X).
> 
>    Michael
> 
> References
> 
>    1. mailto:grass-dev-request at lists.osgeo.org
>    2. mailto:grass4u at gmail.com
>    3. mailto:grass-dev at lists.osgeo.org
>    4. mailto:grass-user at lists.osgeo.org
>    5. mailto:landa.martin at gmail.com

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