Re: mp-geo Metapost package with ConTeXt

[Alan Braslau via ntg-context <ntg-context@ntg.nl>]

On 27/07/21 08:12, Gavin via ntg-context wrote:
> Hi All,
> 
> Getting Closer I asked:
> 
>>> 2) While I’m having good luck with paths, colors are causing trouble. In the data set the color information is in strings with French names of the color, like “rouge.” If I hand this string to MetaPost, MetaPost doesn’t expand it into a color. It does work if it is a native color, like “red,” but not if it is a defined color and not if the color is in a Lua variable. Any suggestions?
> 
> Aditya suggested:
> 
>> \definecolor[rouge][red] should work. A better option will be use color palettes.
> 
> This solves my problem of translating French colors into English, but not the problem of passing colors from Lua to MetaPost. If the string giving the color name is in a variable, it doesn’t go through. A path in a variable works.
> 
> I’ve reduced my MWE below – no French, no MPinclusions, no new colors. Both pie slices should be red, but one is black. Any ideas on getting the color “red” passed from Lua to MetaPost when mycolor=“red”?

I am not looking closely at the code, but in general we use

	fill fullcircle scaled 1cm withcolor red ;

and this takes Metapost's knowledge of red, the rgb triplet (1,0,0).
One can also use

	fill fullcircle scaled 1cm withcolor "red" ;

as a string (quotation) and this passes Context's definition of the color.

Alan



-- 
Alan
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