Re: Passing info from MetaPost to TeX

[Oliver Buerschaper <oliver.buerschaper@mpq.mpg.de>]

Hi Taco,

> Well, you could create a temporary file from withing the metapost
> graphic, then read that file back on the TeX side, and then shift
> the image vertically based on the info from that.

Could you give me a hint on how to parse such an auxiliary file in TeX? I've never done any sort of that programming before...

I'm asking...


> Complicated and a bit ugly, but doable. A nicer solution is to
> adjust the bounging box of the image itself so that it does the
> right thing. This seems to do the trick (but I recall there is
> a way to pass a TeX variable to the figure; and that would be much
> cleaner; but I don't remember how offhand).
> 
> 
> \startuseMPgraphic{diagram2}
>   u := StrutHeight;
>   draw origin--(2u,0)--(u,sqrt(3)*u)--cycle;
>   currentpicture := currentpicture shifted (0,-(sqrt(3)*u/3));
>   setbounds currentpicture to (origin--(2u,0)--(u,sqrt(3)*u)--cycle);
> \stopuseMPgraphic
> 
> \starttext
> 
> \startformula
>  A\raise\Umathaxis\displaystyle\hbox{\useMPgraphic{diagram2}}
>  =B
> \stopformula
> 
> \stoptext


... because adjusting the bounding box fails once the figure grows a bit larger. Just use

u := 3StrutHeight;

in the code above and you'll see the effect.

Thanks for your help,
Oliver
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