% --- start of displayed preamble in the book --- input expressg verbatimtex \def\stack#1{\vbox{\halign{\hfil##\hfil\cr#1\crcr}}} etex % --- end of displayed preamble in the book --- defaultfont:="ptmr8r"; warningcheck:=0; beginfig(1) z0=origin;z1-z0=z2-z1=(3cm,0);z0-z3=z1-z4=z2-z5=(0,1.5cm); drawovalbox(0, 2cm, 1cm)(btex \stack{This is\cr a number} etex); drawcirclebox(3, 1.5cm)(btex circular etex); drawdashcircle(4, 2cm);label(btex phantom? etex,z4); drawroundedbox(2, 1.5cm, 1cm, 2mm)("rounded"); drawroundedbox(5, 1.5cm, 1cm, 0mm)(btex \stack{not\cr rounded} etex); drawNUMBER(1); endfig; end;