[NTG-context] Font for MetaPost graphics

[Aditya Mahajan]

On Thu, 3 May 2012, Marco wrote:

> The wiki claims setting up an MPenvironment is enough to change the
> font in MetaPost graphics:
>
> \startMPenvironment%[global]
> 	\switchtobodyfont [sans]
> \stopMPenvironment
>
> \starttext
> 	This should be serif.
>
> 	\startMPcode
> 		draw textext("This should be in sans.");
> 	\stopMPcode
> \stoptext
>
> However, this has no effect. All text is in default serif font. If
> [global] is provided, all text is in sans font. I am aware of a
> similar issue in a thread last year¹, but the solution didn't really
> address the problem. textext("\sans This should be sans.") works
> here, but the point is that the MPenvironment fails. Why is that?

Metapost now runs as a library. All the text is first typeset by ConTeXt 
and metapost only knows the bounding box of the labels.

You can try (untested):

\starttext

This is serif

\switchtobodyfont[sans]
\startMPcode
draw textext("This should be sans");
\stopMPcode

\stoptext

Aditya