[GRASS-dev] Re: [GRASSGUI] something squirrelly with the PNG/PPM driver

Michael Barton michael.barton at asu.edu
Tue May 8 15:35:51 EDT 2007

I want to confirm that we have the same problem with another Mac G5 that we
just updated from the cvs this morning. Something is broken with either the
PNG drier or with how graphics in barscales and legends are rendered via the
PNG driver. 

I'm not at my desktop at the moment and don't want to break my laptop's
GRASS version. So I'll try later to incrementally change some of these
environmental variables and let you know the result.


On 5/8/07 8:56 AM, "Glynn Clements" <glynn at gclements.plus.com> wrote:

> Michael Barton wrote:
>> Here are all the standard settings from the TclTk and wxPython GUI (from
>> TclTk syntax here)
>>     set env(GRASS_WIDTH) "$driver_w($mon)"
>>     set env(GRASS_HEIGHT) "$driver_h($mon)"
>>     set env(GRASS_PNGFILE) "$mapfile($mon)"
>>     set env(GRASS_BACKGROUNDCOLOR) "ffffff"
>>     set env(GRASS_TRANSPARENT) "TRUE"
>>     set env(GRASS_PNG_AUTO_WRITE) "TRUE"
>>     set env(GRASS_TRUECOLOR) "TRUE"
>> Add a barscale or legend (try a legend for elevation.10m from Spearfish) to
>> the GUI layer tree and render. Do you get correct colors?
> The following produces the same colours as XDRIVER:
> GRASS_PNGFILE=map.ppm \
> d.legend elevation.10m
>> I had updated, did a distclean, and compiled on Friday. Colors are not
>> rendering correctly, and I'm getting partial rendering in some cases. I can
>> look in the tmp directory where this stuff is getting rendered and check the
>> PPM (and PNG files in wxPython) and can see the colors problem in the
>> graphic file.
>> This is only happening when writing to the PNG (PPM) driver. Using the X
>> driver gives no problem. Oddly, maps seem OK, but scalebars and legends are
>> a problem. I suppose that the problem could be something that d.barscale and
>> d.legend are both using, but that maps are not.
>> It could be specific to my office workstation (Mac G5, OS X 4.9). If so,
>> I'll update and recompile. But I want to check to see if this is happening
>> to anyone else.
> Not to me.
> So far as any futher tests are concerned, execute any commands
> manually, in order to eliminate the GUI as a source of potential
> problems.

Michael Barton, Professor of Anthropology
School of Human Evolution & Social Change
Center for Social Dynamics & Complexity
Arizona State University

phone: 480-965-6213
fax: 480-965-7671
www: http://www.public.asu.edu/~cmbarton

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