Hi Luigi,
On Fri, 7 Mar 2008, Luigi Ponti wrote:
http://grass.ibiblio.org/gdp/html_grass63/variables.html#png for some ideas
on how to control it.
If anybody has a pointer to a working example that would be great. While the
concept is clear, the practicalities are not as evident by reading recent
posts on the topic:
http://www.nabble.com/why-d.vect.thematic-won%27t-run-on-WinGRASS---d.mon-problem-td15054987.html#a15054987
Don't be put off by the doubts expressed in that thread! It really is very
simple and easy to use and works very well.
Particularly, how do you tell the PNG driver where to start/stop direct
rendering to png file without d.mon?
Set the environment variable GRASS_RENDER_IMMEDIATE to TRUE. That seems to
be missed out in that list. Here is a simple example that works at the
Windows command prompt (seeing you mentioned Windows) using spearfish:
set GRASS_RENDER_IMMEDIATE=TRUE
set GRASS_TRUECOLOR=TRUE
set GRASS_PNGFILE=c:\output.png
d.rast elevation.dem
rem Next line is required so the calls to d.vect are overlaid on the raster
set GRASS_PNG_READ=TRUE
d.vect roads color=black
d.vect streams color=blue
Hopefully that will get you started.
Paul
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