% Create a rectangle of the full size
a := unitsquare xyscaled(\overlaywidth,\overlayheight);
% Randomize it a bit
-b := a randomized (\overlaywidth / 25) ;
+b := a randomized (min(\overlayheight, \overlaywidth) / 25) ;
% And draw it
drawoptions (withpen pencircle scaled .75mm withcolor black) ;
draw b;
% Reset the typing options
\setuptyping[option=none,style=\tttf]
}
+
+% Display a useMPgraphic in a pretty box
+\define[1]\boxedgraphic{
+ \startboxed
+ \useMPgraphic{#1}
+ \stopboxed
+}