\setupoutput[pdftex]
\runMPgraphicstrue

\starttext
\startuseMPgraphic{kante}
u=12pt;

pair p[];

p1 = (2u,0u);
p2 = (1u,2u);

label.top(btex $e_1$ etex, p1);
label.top(btex $e_2$ etex, p2);
label.top(btex $(e_1, e_2)$ etex, subpath 0.5 of p1--p2);
drawarrow p1--p2;
\stopuseMPgraphic

\placefigure[here]{15 Mann auf des toten Mannes Kiste}{\useMPgraphic{kante}}

yo ho ho und ne buddel rum

\stoptext