[GRASS-dev] [GRASS GIS] #2285: Repetitive d.rast calls for wx0 monitor from command line

[GRASS GIS]

#2285: Repetitive d.rast calls for wx0 monitor from command line
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 Reporter:  hcho     |       Owner:  grass-dev@…              
     Type:  defect   |      Status:  new                      
 Priority:  major    |   Milestone:  7.0.0                    
Component:  Display  |     Version:  svn-trunk                
 Keywords:           |    Platform:  Linux                    
      Cpu:  x86-64   |  
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 I was drawing 168 raster maps on the wx monitor from a shell script:
 {{{
 #!/bin/sh
 maps=`g.mlist rast pattern="n[0-9]*w[0-9]*_1" sep=,`
 g.region rast=$maps res=00:01:00
 d.erase
 for i in `echo $maps | sed 's/,/ /g'`
 do
         d.rast $i
 done
 }}}
 after starting and selecting a wx monitor. I'm getting the following error
 messages and not all the raster maps are displayed:
 {{{
  100%
  100%
  100%
  100%
  100%
  100%
  100%
 ERROR: No graphics device selected. Use d.mon to select graphics device.
 ERROR: No graphics device selected. Use d.mon to select graphics device.
 ERROR: No graphics device selected. Use d.mon to select graphics device.
  100%
  100%
  100%
 }}}

 I digged into the wx monitor script (gui/wxpython/mapdisp/main.py
 DMonMap.Render) and found that it unsets MONITOR (because
 GRASS_RENDER_IMMEDIATE doesn't like monitors) before calling d.rast and
 then restores it:
 {{{
         currMon = grass.gisenv()['MONITOR']

         RunCommand('g.gisenv',
                    unset = 'MONITOR') # GRASS_RENDER_IMMEDIATE doesn't
 like monitors

         ret = Map.Render(self, *args, **kwargs)

         RunCommand('g.gisenv',
                     set = 'MONITOR=%s' % currMon)
 }}}

 So far, so good. Unfortunately, the wx monitor is running in a different
 process than d.rast calls from command line. Many d.rast calls cannot see
 the MONITOR variable while the monitor is rendering existing maps, which
 causes the above error.

-- 
Ticket URL: <http://trac.osgeo.org/grass/ticket/2285>
GRASS GIS <http://grass.osgeo.org>