[GRASS-dev] [GRASS GIS] #239: crash if zooming in too much

[Michael Barton]

On Jul 30, 2008, at 8:05 AM, <grass-dev-request at lists.osgeo.org> wrote:

> Date: Wed, 30 Jul 2008 14:50:24 -0000
> From: "GRASS GIS" <trac at osgeo.org>
> Subject: [GRASS-dev] [GRASS GIS] #239: crash if zooming in too much
> To: undisclosed-recipients:;
> Message-ID: <042.96bc0dcf53e1293f1163968a93fb5e8d at osgeo.org>
> Content-Type: text/plain; charset="utf-8"
>
> #239: crash if zooming in too much
> ---------------------- 
> +-----------------------------------------------------
> Reporter:  msieczka  |       Owner:  grass-dev at lists.osgeo.org
>     Type:  defect    |      Status:  new
> Priority:  major     |   Milestone:  6.4.0
> Component:  default   |     Version:  svn-develbranch6
> Keywords:            |    Platform:  Linux
>      Cpu:  x86-64    |
> ---------------------- 
> +-----------------------------------------------------
> r32363
>
> 1. Add a raster map (raster or vector).
>
> 2. Zoom in until an error like this pops up:
>
> {{{
> Execution failed: 'd.rast map=N51E016 at PERMANENT --q'
>
> Details:
>  ERROR: region for current mapset line 1run "g.region"
> }}}
>
> 3. Try to "Zoom to selected map" or any other zoom operation - a  
> crash:
>
> {{{
>  Traceback (most recent call last):
>   File "/usr/local/grass-6.4.svn/etc/wxpython/gui_modules/ma
> pdisp.py", line 2076, in OnZoomToMap
>
> self.ZoomToMap()
>   File "/usr/local/grass-6.4.svn/etc/wxpython/gui_modules/ma
> pdisp.py", line 2129, in ZoomToMap
>
> self.UpdateMap()
>   File "/usr/local/grass-6.4.svn/etc/wxpython/gui_modules/ma
> pdisp.py", line 579, in UpdateMap
>
> self.mapfile = self.Map.Render(force=True,
> mapWindow=self.parent, windres=windres)
>   File "/usr/local/grass-6.4.svn/etc/wxpython/gui_modules/re
> nder.py", line 762, in Render
>
> if not layer.Render():
>   File "/usr/local/grass-6.4.svn/etc/wxpython/gui_modules/re
> nder.py", line 135, in Render
>
> os.environ["GRASS_PNGFILE"] = self.mapfile
>   File "/usr/lib/python2.5/os.py", line 474, in __setitem__
>
> putenv(key, item)
> TypeError
> :
> putenv() argument 2 must be string, not None
> }}}
>
> -- 
> Ticket URL: <http://trac.osgeo.org/grass/ticket/239>
> GRASS GIS <http://grass.osgeo.org>

Arrgh. Fixed this in TclTk but seems like we need to fix it in  
wxPython too. Thanks for spotting it. With new graphic tools in  
wxpython, Glynn's rewrite of the display drivers, and Martin's work on  
nD visualization we may be reworking the display rendering engine. At  
the moment, I'm not sure how much will be back ported to wxpython. We  
might try a simple patch on this for the moment, however. I'll try to  
look into it.

Michael