<html><head><meta name="color-scheme" content="light dark"></head><body><pre style="word-wrap: break-word; white-space: pre-wrap;">%-*-tex-*-
%boxexample
\def\wid{{\tt wd}}
\def\hei{{\tt ht}}
\def\dpt{{\tt dp}}
\def\boxpoint{\setbox2=\hbox{\vrule width 8pt height 3pt depth 5pt} \wd2 =0pt
              \ht2=0pt \dp2=0pt \hskip -8pt \box2}
\setbox4=\hbox{\hei}
\def\vbrule{\vrule width 1pt}
\def\hbrule{\hrule height 1pt}
\setbox0=\hbox to 1.2in{\vbrule$\longleftarrow \hss \wid \hss\longrightarrow$\vbrule}
\setbox8=\vbox to 2in{\offinterlineskip\hbox to \wd4{\hss$\uparrow$\hss}
               \hbox to \wd4{\hss $\Bigg\vert$\hss}\vss
               \hbox to \wd4{\hss \hei\hss}\vss
               \hbox to \wd4{\hss $\Bigg\vert$\hss}
               \hbox to \wd4{\hss$\downarrow$\hss}}
\setbox6=\vbox{\hbox to \wd4{\hss$\uparrow$\hss}
               \hbox to \wd4{\hss \dpt\hss}
               \hbox to \wd4{\hss$\downarrow$\hss}}

\def\boxexample{\bigbreak\line{\hss
                 \vtop{\copy0 \offinterlineskip
                       \smallskip
                       \hbrule
                       \hbox to \wd0{\vbrule height \ht8 
                                     \boxpoint \hss
                                     \hskip 4pt\copy8 \hss
                                     \vbrule height \ht8}
                       \hbrule 
                       \hbox to \wd0{\vbrule height \ht6 \hss
                                     \copy6 \hss
                                     \vbrule height \ht6}
                       \hbrule
                       } 
                     \vtop{\hrule height 0pt
                           \vskip 1in
                           \hbox{\qquad \vrule height 6pt width 8pt depth 2pt
                                 \quad $\Leftarrow$ Reference Point}
                           \vskip 62pt
                           \hbox{$\Leftarrow$ Baseline}}
                     \hss}\medskip}
</pre></body></html>