[GRASS5] Hex equivalents of grass colors?

[Michael Barton]

This is fine. But what I need is to translate from the GRASS color names to
hex, not RGB, so that they can be used in TclTk canvases and text. Do you
want to put another proc into gui.tcl for 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: Cedric Shock <cedricgrass at shockfamily.net>
> Date: Sun, 16 Apr 2006 15:48:47 -0700
> To: Michael Barton <michael.barton at asu.edu>
> Cc: <grass5 at grass.itc.it>
> Subject: Re: [GRASS5] Hex equivalents of grass colors?
> 
> On Saturday 15 April 2006 21:58, you wrote:
>> Thanks. This will be helpful. Should I stick a translation procedure into
>> gm.tcl, or put it elsewhere?
>> 
> 
> A procedure related to G_str_to_color (the colors below) is in gui.tcl as
> 
> proc color_grass_to_rgba255 {string}
> 
> It returns a list of four numbers in [0, 255] for red, green, blue, and alpha.
> 
> Examples:
> 
> color_grass_to_rgba255 red
> {255 0 0 0}
> color_grass_to_rgba255 none
> {0 0 0 255}
> color_grass_to_rgba255 1:200:30
> {1 200 30 0}
> 
> These colors are only the ones used with these display programs, and possibly
> with some other non-display programs:
> d.graph
> d.mapgraph
> d.path
> d.vect
> d.vect.chart
> 
> I'd hold off on much color stuff of this sort until we get the colors sorted
> out a bit more.
> 
> --Cedric
> 
>> 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: Cedric Shock <cedricgrass at shockfamily.net>
>>> Date: Sat, 15 Apr 2006 18:14:09 -0700
>>> To: <grass5 at grass.itc.it>
>>> Cc: Michael Barton <michael.barton at asu.edu>
>>> Subject: Re: [GRASS5] Hex equivalents of grass colors?
>>> 
>>> Michael,
>>> 
>>>> Is there some kind of lookup available for the hex equivalent of
>>>> standard grass colors (red, violet, etc)? Lacking that, is there an RGB
>>>> lookup that I could translate to hex?
>>> 
>>> This is information is on my wish list too. I found it in:
>>> http://freegis.org/cgi-bin/viewcvs.cgi/grass6/lib/gis/color_str.c
>>> 
>>>     {"white",   255, 255, 255},
>>>     {"black",     0,   0,   0},
>>>     {"red",     255,   0,   0},
>>>     {"green",     0, 255,   0},
>>>     {"blue",      0,   0, 255},
>>>     {"yellow",  255, 255,   0},
>>>     {"magenta", 255,   0, 255},
>>>     {"cyan",      0, 255, 255},
>>>     {"aqua",    100, 127, 255},
>>>     {"grey",    127, 127, 127},
>>>     {"gray",    127, 127, 127},
>>>     {"orange",  255, 127,   0},
>>>     {"brown",   180,  75,  25},
>>>     {"violet",  255,   0, 255},
>>>     {"indigo",    0, 127, 255}
>>> 
>>> And of course the red:green:blue format and NONE / none / NonE whatever
>>> returns the special no color.
>>> 
>>> I've been playing with colors a bit too. I have a little rgb/his color
>>> system color picker that has sliders for red, green, blue, hue,
>>> intensity, and saturation. This is possible since, although neither rgb
>>> or his is an absolute color space, they are remappings of the same color
>>> model.
>>> 
>>> This code snippet takes integer red green and blue values on [0,255] to a
>>> hex color for tcl:
>>> 
>>> set rX [format %02X $red]
>>> set gX [format %02X $green]
>>> set bX [format %02X $blue]
>>> 
>>> set color "#$rX$gX$bX"
>>> 
>>> --Cedric