[GRASS-dev] [bug #5243] (grass) d.vect: better random color generation

[Michael Barton]

Actually, random color generation and saving colors in the RGB column are a
kind of thematic mapping that should be integrated into a new and improved
d.vect.thematic. I think that Moritz Lennart's team is working on this.

Michael
__________________________________________
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



> From: Martin Landa <landa.martin at gmail.com>
> Date: Sat, 18 Nov 2006 11:16:57 +0100
> To: Hamish <hamish_nospam at yahoo.com>
> Cc: <grass-dev at grass.itc.it>
> Subject: Re: [GRASS-dev] [bug #5243] (grass) d.vect: better random color
> generation
> 
> Hi,
> 
> I am thinking about relationship between d.vect and d.vect.thematic.
> BTW d.vect.themetic should be rewritten to C, is anybody working on
> it? (sorry, I am trying to read every message in grass-dev, bad
> memory;-). I am just wondering about d.vect X d.vect.thematic
> modules...
> 
> Thanks for clarification.
> 
> Best regards, Martin
> 
> 2006/11/18, Martin Landa <landa.martin at gmail.com>:
>> Hi,
>> 
>> 2006/11/18, Hamish <hamish_nospam at yahoo.com>:
>>> Martin Landa wrote:
>>>> I have tried to implement random coloring using
>>>> G_make_random_colours(), see the attached patch for d.vect.
>>> 
>>> do multiple vector features with the same cat value have the same color?
>> 
>> yes, they should have the same color, e.g. (spearfish60)
>> 
>> d.erase;d.vect landuse dis=cat,shape -c
>> 
>>> general question: how to "lock-in" nice random colors once you find
>>> them? e.g. populate GRASSRGB attribute column to survive d.redraw and
>>> use with ps.map.
>> 
>> One of the solutions: new flag -u to update color values to GRASSRGB
>> column in attribute table (like in d.vect.thematic). Do you have
>> better idea?
>> 
>>> 
>>>> Then I will also try to implement random colors based on the given
>>>> attribute column.
>>> 
>>> how about "true" color scaling min->max like d.vect.thematic does with
>>> value-bands?
>>> 
>>> 
>>> cheers,
>>> Hamish
>>> 
>> 
>> Martin
>> 
>> --
>> Martin Landa <landa.martin at gmail.com> * http://gama.fsv.cvut.cz/~landa *
>> 
> 
> 
> -- 
> Martin Landa <landa.martin at gmail.com> * http://gama.fsv.cvut.cz/~landa *
> 
>