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

[Michael Barton]

Does d.erase work if there are no monitors?

Michael
______________________________
Michael Barton, Professor
Professor of Anthropology
Director of Graduate Studies
School of Human Diversity & Social Change
Center for Social Dynamics & Complexity
Arizona State University
Tempe, AZ  85287-2402
USA

voice: 480-965-6262; fax: 480-965-7671
www: http://www.public.asu.edu/~cmbarton

On Jan 24, 2008, at 3:07 PM, Glynn Clements wrote:

>
> Michael Barton wrote:
>
>> I'm going to try this as soon as I can steal a bit of time. I'm
>> somewhat uncertain how to get the initial PNG for GRASS_PNG_READ.
>>
>> I can create a dummy temp map using r.mapcalc and then save it to a
>> PNG using r.out.png. But I need to make sure that it's background is
>> transparent so that the final composite can overlay whatever is in  
>> the
>> map display. Any suggestion for how I do that?
>
> You don't actually need to create an initial image; if the file
> doesn't exist, any GRASS_PNG_READ=TRUE setting will be silently
> ignored. If the file does exist, the dimensions and depth must match
> the values of $GRASS_WIDTH, $GRASS_HEIGHT and $GRASS_TRUECOLOR.
>
> You can create a blank image with "d.frame -e" or "d.erase -f". If
> GRASS_TRANSPARENT=TRUE, the image will be transparent, otherwise it
> will be filled with $GRASS_BACKGROUNDCOLOR. This works both with
> direct rendering and the PNG driver. Note that "d.erase" alone is
> equivalent to "d.erase color=white". There isn't any way to clear a
> portion of the screen to transparent, only the entire screen.
>
> -- 
> Glynn Clements <glynn at gclements.plus.com>