[Gmsh] mesh partition colors

[Jozsef Bakosi]

On Sat, Jun 11, 2005 at 12:24:08AM -0700, Christophe Geuzaine wrote:
> Jozsef Bakosi wrote:
> >Hello all,
> >
> >after applying the patch from Chirstophe, in case of a mesh with
> >different partitions, gmsh displays the mesh very nicely using
> >different colors now. I have, however, a few minor questions/requests
> >regarding this functionality.
> >
> >If I have mesh-partition #0, how do I set its color? In
> >Options->Mesh->Color there are only colors assigned starting from One,
> >Two, etc. It would be great to be able to use partition number 0. This
> >is a minor thing, however, because one could just save the partitioned
> >mesh-file with partition numbers starting from 1 and also gmsh does handle
> >partition #0 as a different partition, but still, I think it would
> >be great have its color controllable, now that it handles it right.
> 
> Hi Jozsef - the current version actually associates the color "one" with
> all partitions such that (partition_number % 10) == 0, the color "two"
> with all the partitions s.t. (partition_number % 10) == 1, etc.

Hmmm, I understand and I guess it should work, but then why do I get the
same colors for partition 1,2 and 8,9 on the following mesh:
http://camp.gmu.edu/jbakosi/pub/cylinder/mesh/cylinder.msh ? But maybe I
mess up something else when writing the mesh-file...

> >How are the colors to partition numbers higher than 10 assigned? Is this
> >changeable (through ~/.gmsh-options at least)? I don't wish for too
> >many more, but another 10 would be great. Also, I'm not sure, but I
> >think I remember correctly that partitions over 10 get the same color
> >(or end up having some of the already used colors). That can be confusing.
> 
> I've increased the number of colors in the carousel from 10 to 20, and
> changed the numbering to start at "zero" instead of "one". It should be
> less confusing this way :-)

Very cool, thanks.

> >When I save partitions of a bigger mesh into seperate files with
> >different partition numbers (but each file only has one number of course),
> >it would be great if gmsh displayed the mesh according to the number in the
> >file (and not using the the color for partition One, since that is the
> >only one in that file). (I know if I just wanted to look at the different
> >partitions (from one file), I could just hide the ones I don't want to look
> >at, but I needed to save different partitions to different files and wanted
> >to look at them separately to see if they are correctly 
> >transmitted/received
> >and -- locally to a processor -- reordered well. Yeah, that was a way of
> >debugging for me... :-)
> 
> I don't understand your question: the color is already chosen according 
> to the partition number (in the file).

What I mean is that when I open the files
http://camp.gmu.edu/jbakosi/pub/cylinder/mesh/cylinder.msh.p1of15
http://camp.gmu.edu/jbakosi/pub/cylinder/mesh/cylinder.msh.p2of15
http://camp.gmu.edu/jbakosi/pub/cylinder/mesh/cylinder.msh.p3of15
and so on, they all look like the following (ie. using the same color, that
is color "One"):
http://camp.gmu.edu/jbakosi/pub/cylinder/mesh/p1of15.png
http://camp.gmu.edu/jbakosi/pub/cylinder/mesh/p2of15.png
http://camp.gmu.edu/jbakosi/pub/cylinder/mesh/p3of15.png
even though they all have different partition numbers 0, 1, 2, etc, respectively.

This is my .gmsh-options file:
http://camp.gmu.edu/jbakosi/pub/cylinder/mesh/gmsh-options

Jozsef
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