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

[Martin Landa]

Hi,

I have tried to implement random coloring using
G_make_random_colours(), see the attached patch for d.vect.

If there are no serious objections, I will committ the changes into
CVS. Then I will also try to implement random colors based on the
given attribute column.

Best regards, Martin

2006/10/29, Request Tracker <grass-bugs at intevation.de>:
> this bug's URL: http://intevation.de/rt/webrt?serial_num=5243
> -------------------------------------------------------------------------
>
> [wish]
>
> Hi,
>
> currently "d.vect -c" random colors is limited to 16 colors, which do
> not rotate between calls. (you get the same colors every time, d.redraw
> doesn't help if you don't like the results)
>
> see display/d.vect/plot.h for current candidates.
>
> I suggest using random color code from lib/gis/color_rand.c to do a
> better job. It seems to work pretty well.
>
>
> or if that won't work (too many cats to store RGB values) start with
> random seed and calculate R,G,B values by some mathematical function
> which will give the same answers for those 3 variables within the module
> run.
>
>
> thanks,
> Hamish
>
>
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> Date: Sun, 29 Oct 2006 20:10:26 +1300
> From: Hamish <hamish_nospam at yahoo.com>
> To: grass-bugs at intevation.de
> Subject: d.vect: better random color generation
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-- 
Martin Landa <landa.martin at gmail.com> * http://gama.fsv.cvut.cz/~landa *
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