[NTG-context] Calculating a value in metapost, and using it in ConTeXt

[Kate F]

On 27 May 2015 at 00:18, Hans Hagen <pragma at wxs.nl> wrote:
> On 5/26/2015 9:17 PM, Kate F wrote:
>>
>> Hello,
>>
>> Is it possible to calculate the position of something in Metapost, and
>> to export that value to TeX such that I can use it in setups and
>> things?
>
>
> it depends on what you want to calculate
>
> \startMPcalculation
>     path p, q;
>
>     h := PaperHeight;
>     w := PaperWidth;
>
>     p = (0, 0) -- (w, .5h);
>     q = (0, h) -- (w, 0);
>
>     z0 = p intersectionpoint q;
>
>     passvariable("z",ypart z0) ;
> \stopMPcalculation
>
> \setuplayout
>   [topspace=0pt,
>    header=0pt,
>    height=\MPrunvar{z}bp]
>
> \showgrid
>
> \starttext
>     xyz:\MPrunvar{z}
> \stoptext
>

Wonderful!

-- 
Kate