[GRASS-dev] why d.vect.thematic won't run on WinGRASS - d.mon problem

[Moritz Lennert]

On 24/01/08 16:07, Michael Barton wrote:
> 
> On Jan 24, 2008, at 2:54 AM, grass-dev-request at lists.osgeo.org wrote:
> 
>> Date: Thu, 24 Jan 2008 10:53:51 +0000
>> From: Glynn Clements <glynn at gclements.plus.com>
>> Subject: Re: [GRASS-dev] why d.vect.thematic won't run on WinGRASS -
>>     d.mon    problem
>> To: Michael Barton <michael.barton at asu.edu>
>> Cc: GRASS developers list <grass-dev at lists.osgeo.org>
>> Message-ID: <18328.28223.869808.987628 at cerise.gclements.plus.com>
>> Content-Type: text/plain; charset=us-ascii
>>
>>
>> Michael Barton wrote:
>>
>>>> If you just want d.vect.thematic to work with WinGRASS, changing it to
>>>> use GRASS_RENDER_IMMEDIATE=TRUE instead of "d.mon start=PNG" would
>>>> probably be less work than getting monitors working.
>>>
>>> In fact, we recently had to change d.vect.thematic to set
>>> GRASS_RENDER_IMMEDIATE=FALSE so that it's multiple iterations of
>>> d.vect would composite in the PNG monitor and then be output as a PNG
>>> to the GUI.
>>
>> You can use GRASS_PNG_READ=TRUE to have it read an existing file at
>> startup, rather than starting with a blank "screen". That way, each
>> command will overlay the output from previous commands.
>>
>> --Glynn Clements <glynn at gclements.plus.com>
>>
> 
> Glynn,
> 
> This sounds like it might be a way out of this dilemma. Can you explain 
> this setting a it more? Also, once all the commands are overlayed is 
> there someway to get them to output to a PNG or PNM so that the GUI can 
> pick it up--since we can't do it with d.mon stop=PNG?

GRASS_RENDER_IMMEDIATE=TRUE always outputs a PNG or PNM file (depending 
on the setting of GRASS_PNGFILE. As the manual on the PNG env variables 
says: if you set GRASS_PNG_READ to "TRUE", "the PNG driver will 
initialize the image from the contents of $GRASS_PNGFILE", i.e. it will 
read the contents of $GRASS_PNGFILE and adds the results of your drawing 
command to it. The output thus still is $GRASS_PNGFILE.

Moritz


> 
> Michael
> 
> ____________________
> C. Michael Barton, Professor of Anthropology
> Director of Graduate Studies
> School of Human Evolution & Social Change
> Center for Social Dynamics & Complexity
> Arizona State University
> 
> Phone: 480-965-6262
> Fax: 480-965-7671
> www: <www.public.asu.edu/~cmbarton>
> 
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