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On Thu, 22 May 2003 11:47:14 +0200
Michal Kvasnicka <quasar@econ.muni.cz> wrote:

> I'd like to join two point (E1 and E2) having the same ypart 
> (ypart(E1)=ypart(E2)) with the TeX underbrace sign. To do it I have to tell 
> TeX (via btex ... etex?) the horizontal distance of the two points. Do you 
> know how can I do it?


%%% snip-->
input TEX ;

pair E[] ; numeric XShift ;

XShift := 3cm ; E1 := (1,13) ; E2 := E1 shifted (XShift,0) ;

beginfig(1);
pickup pencircle scaled 2pt ;
draw E1 ; label.top("E1",E1);
draw E2 ; label.top("E2",E2);

labeloffset := 0 ;

label.bot(
  TEX("$\underbrace{\hbox to " &
  (decimal (xpart (E2-E1))) & "bp{}}$"), 0.5[E1,E2]) ;
endfig;

end
%%%<--snap

The example above is plain MP. Embedded in a ConTeXt document you
should better use the "textext" macro instead of the "TEX" macro from
TEX.mp.

Jens