[GRASS5] Color prompt partially implemented, color confusion.

[Helena Mitasova]

>>
>> G_str_to_color ignores case.
>> D_translate_color is case sensitive
>>
>> name      D_translate_color    G_str_to_color
>> red          255 0 0                 same
>> orange     255 128 0             255 127 0
>> yellow      255 255 0             same
>> green       0 255 0                 same
>> blue         0 0 255                 same
>> indigo      0 128 255             0 127 255
>> violet       255 0 255             same    (this is a strange violet)
>> black       0 0 0                      same
>> white      255 255 255         same
>> gray        175 175 175         127 127 127
>> brown     180 77 25              same
>> magenta 255 0 128              255 0 255  (D_ has a very strange  
>> magenta)
>> aqua       100 128 255          100 127 255
>> grey        lookup to gray         127 127 127
>> cyan        doesn't exist           0 255 255
>>
>> How should we straighten out these colors?
>
> Colours which refer to the corners of the colour cube should have the
> correct values, so magenta should be 255,0,255. Arguably, gray/grey
> (do we need both spellings; the rest of GRASS uses US spellings
> consistently) should be 127/128 (the centre of the colour cube).
>
> It doesn't really matter about orange, indigo, violet, brown or aqua,
> as those don't have any obvious definition, although we should decide
> whether 50% is 127 or 128 and use one value consistently.
>
> Cyan should either be removed from G_str_to_color() or added to the
> list of standard colours in the display architecture. Updating the
> display architecture is tricky, as there are quite a few places that
> would need to be changed. OTOH, it's the only corner which isn't in
> the list.

I would vote for adding cyan if possible, Helena
>
> If choose to add cyan to the list of standard colours, we may as well
> renumber them so that the corners use the indices from 1 to 8 (i.e.
> index = 1+r+2g+4b); zero is reserved for transparent in some contexts.
>
> -- 
> Glynn Clements <glynn at gclements.plus.com>
>
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