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 <[EMAIL PROTECTED]>
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