Good evening.
Is there some restriction to Metapost macros when compiled by texexec --mptex? I'd like to compile a file like this:
i can't see what goes wrong there (this tex in mp stuff is such a mess)
from within context the following works ok:
\starttext
\startMPpage[offset=4cm]
z1=(0,1cm); z2=(3cm,1cm);
dotlabel.top(btex $z_1$ etex,z1);
dotlabel.top(btex $z_2$ etex,z2);
draw textext("$\string\underbrace{\hbox to "&decimal(xpart(z2)-xpart(z1))&"pt{\hss}}$") shifted .5[z1,z2];
\stopMPpage
\stoptext
or:
\starttext
\let\normalunderbrace\underbrace \unexpanded\def\underbrace{\normalunderbrace} % hm, i need to make these unexpanded
\startMPpage[offset=4cm]
z1=(0,1cm); z2=(3cm,1cm);
dotlabel.top(btex $z_1$ etex,z1);
dotlabel.top(btex $z_2$ etex,z2);
draw textext("$\underbrace{\hbox to "&decimal(xpart(z2)-xpart(z1))&"pt{\hss}}$") shifted .5[z1,z2];
\stopMPpage
\stoptext
Hans
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