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+%From: hwb@texnix.stgt.sub.org (Harald Boegeholz)
+%Newsgroups: comp.text.tex
+%Date: 14 Jan 91 13:44:29 GMT
+%
+%Hi!
+%
+%Some time ago I wrote some TeX-macros to typeset trees. Since
+%two people asked recently, here they are (quite short, so I thought
+%I might post). Be aware, though, of two possible problems:
+%  1. The macros use the \specials defined by emTeX. If your DVI-driver
+%     doesn't support these, you won't see any lines.
+%  2. The semantic nest size required is considerable (too many boxes
+%     inside of boxes inside of boxes...), so you'll possibly need
+%     a TeX which is "large" in this respect for typesetting complex trees.
+%
+%Hope this helps
+%Harald
+%------------------ cut here with a sharp knife ------------------------
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% tree macros by Harald Boegeholz
+% This file uses the \specials defined by emTeX to draw the lines!
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\newcount\pointnumber \pointnumber=0
+\newcount\father
+\font\nodefont=cmr7
+\def\nextpoint{\global\advance\pointnumber by 1\relax}
+\def\endsubtrees{\endsubtrees}
+\def\tn#1{\vbox{%
+  \vskip.5mm
+  \hbox{\nodefont\hskip1ex\relax #1\hskip1ex}
+  \vskip.5mm
+  }%
+}
+\def\tree#1#2{%
+  \vtop{%
+    \nextpoint
+    \father=\pointnumber
+    \halign{\hfil##\hfil\cr
+      #1\cr
+      \special{em:point \number\father}\cr
+      \noalign{\vskip5mm}
+      \hbox{\subtrees#2\endsubtrees}\cr
+    }%
+  }%
+}%
+\def\subtrees#1{\ifx#1\endsubtrees\let\next\relax\else
+  \vbox{\halign{\hfil##\hfil\cr
+    \nextpoint
+    \special{em:point \number\pointnumber}%
+    \special{em:line \number\pointnumber h,\number\father h}\cr
+    #1\cr
+  }}%
+  \let\next\subtrees\fi
+  \next
+}
+\def\labeledtree#1#2{\vbox{\offinterlineskip\halign{\hfil##\hfil\cr
+  #1\cr
+  \noalign{\vskip3pt}%
+  $\scriptstyle#2$\cr
+}}}
+
+\parindent0pt
+\raggedbottom
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+% macros end here ... sample follows:
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\endinput
+
+{\labeledtree{% 
+  {\tree{\tn{1}}{% 
+    {\tree{\tn{2}}{% 
+      {\tn{3}}% 
+      {\tn{4}}% 
+      }}% 
+    {\tree{\tn{5}}{% 
+      {\tn{6}}% 
+      }}% 
+    }}% 
+}{[1,2,2,1,5]}}% 
+
+\bye
+------------------ cut here with a sharp knife ------------------------
+--
+Harald Boegeholz |Home:       hwb@texnix.stgt.sub.org (read daily)
+                 |University: boegehol@az3.informatik.uni-stuttgart.de
+                 |            ^ please use the latter for large (>100k) mails