[GRASS5] [bug #4066] (grass) gis.m: black background

[Markus Neteler]

On Mon, Feb 13, 2006 at 03:59:19PM +0000, Glynn Clements wrote:
> 
> Jachym Cepicky wrote:
> 
> > > > this bug's URL: http://intevation.de/rt/webrt?serial_num=4066
> > > > -------------------------------------------------------------------------
> > > > 
> > > > Subject: gis.m: black background
> > > > 
> > > > Platform: GNU/Linux/x86
> > > > grass obtained from: CVS
> > > > grass binary for platform: Compiled from Sources
> > > > GRASS Version: cvs_head_20060207
> > > > 
> > > > I can confirm the problem with the back blackground in gis.m which
> > > > Maciek mentioned as a side note in another bug report
> > > > (http://intevation.de/rt/webrt?serial_num=4049&display=History).
> > > > 
> > > > When I erase the map display the background becomes white, but as
> > > > soon as I display a map it becomes black again.
> > > 
> > > I've just fixed a bug related to the background colour in the PNG
> > > driver; pngdriver.h had "unsigned int background" rather than
> > > "extern unsigned int background", so each source file had its own
> > > "background" variable, most of which would be implicitly initialised
> > > to zero and remain at zero.
> > > 
> > > BTW, while most of the changes were simply reorganisation, and didn't
> > > affect any functionality (or, at least, weren't meant to), the PNG
> > > driver's implementation of R_erase() has been changed to erase to the
> > > original background colour (which will be transparent if
> > > GRASS_TRANSPARENT is set to TRUE), not the current colour.
> > > 
> > > This affects the behaviour of "d.erase -f" and "d.frame -e". 
> > > Previously, there was no way to erase to transparent after
> > > initialisation.
> > 
> > is this problem solved or not? Fresh cvs from today, the background
> > under vector file is black :-/
> 
> I had already committed that fix when I wrote the message; I haven't
> changed anything relevant since.
> 
> Under what circumstances does the problem arise? Only with the PNG
> driver, or also with XDRIVER? Are you setting any of the GRASS_*
> environment variables.


I got the following suggestion from Michael which helped:

On Fri, Feb 10, 2006 at 08:51:46AM -0700, Michael Barton wrote:
> I think you need to set GRASS_TRANSPARENT to FALSE in mapcanvas.tcl.

I don't know if that's in CVS now.

Markus