On Aug 14, 2008, at 8:19 PM, Glynn Clements wrote:
Michael Barton wrote:
I think the mistake is the fact that in the wxGUI the raster is
displayed without -o flag as default, as it is in the tcltk GUI.
You can change default settings in GUI Preferences dialog, tab
"Command",
"Raster settings". I am not quite sure if '--o' should be defaut for
d.rast as it is in TCL/TK GUI.
I think that the default behavior of d.rast and the subsequent
addition of the -o flag is an historical artifact of the days before
GRASS rasters had null support. At that time, "0" values could mean a
values of 0 OR null values. Or nulls could be indicated by other
values like -999.
Now that there is null support for rasters, the default behavior of
rasters should be that nulls are transparent during overlays,
although
the option to make them opaque should be retained.
The -o flag is additionally problematic in that it is very similar to
the --o flag which means "overwrite" in other contexts. We will need
to keep the -o flag for the GRASS 6 series, but I would recommend
changing it to something else for GRASS 7.
Change in r32771. d.rast now makes nulls transparent by default; use
-n to make them opaque. The -o flag no longer exists.
The GUIs will need to be updated accordingly.
Thanks!
Michael
Do we need to keep opaque nulls the default for GRASS 6?
For 6.x? d.rast can't change, but the default state of the checkbox in
wxGUI could be changed (gis.m already makes -o the default).
--
Glynn Clements <[EMAIL PROTECTED]>
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