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% how to run.
% \input tree.sty or \documentstyle[tree]{..}
% run through latex as you normally do
% remember to send it to a postscript printer
% Written by Emma Pease
% Modified by Avery Andrews May 1992
% Modifications suggested by Gintautas Grigelionis
% (gintas@theophys.kth.se) added May 1995
% arrows fixed on anodeconnect and aanodeconnect added May 1995 by Emma
% to do, fix barnodeconnect arrows
% clean up code
%% version .91 - May 16, 1995
\typeout{tree-dvips version .91 of May 16, 1995}
% This ensures that the header file for postscript is inserted. Note
% that extracting pages with dvips will keep this header file but that
% extracting with dviselect will not unless the absolute first page is
% included.
\special{header=tree-dvips91.pro}
% The \pscmd command insures that all things in the postscript are
% properly bracketed. Also included are the current parameters for
% nodemargin, width of lines, dashlength, arrow width, length, and inset.
\def\pscmd#1{\special{ps:@beginspec%
/nodemargin \@int{\the\nodemargin}\space pt def %
\@int{\the\treelinewidth}\space pt setlinewidth %
\ifdim\dashlength=0pt [] 0 setdash%
/arrowwidth \@int{\the\arrowwidth}\space pt def %
/arrowlength \@int{\the\arrowlength}\space pt def %
/arrowinset \@int{\the\arrowinset}\space pt def %
\else [\@int{\the\dashlength}\space pt] 0 setdash \fi\space #1 %
@endspec}}
% \@int ensures that the numbers are passed down to the printer
% correctly.
{\catcode`p=12 \catcode`t=12 \gdef\wnum#1pt{#1}}
\def\@int#1{\expandafter\wnum#1}
% PARAMETERS IN TREE MODE
% nodemargin is the extra margin around the hbox enclosing the node.
% treelinewidth is the width of the lines
% dashlength is the length of the dashes
\newdimen\nodemargin %
\nodemargin=2pt
\newdimen\treelinewidth
\treelinewidth=.3pt
\newdimen\dashlength
\dashlength=0pt
% * _
% *
% * * arrowwidth
% *
% * _
% | | arrowlength
% | | arrowinset
% arrowwidth
\newdimen\arrowwidth
\arrowwidth 3pt
\newdimen\arrowlength
\arrowlength 4pt
\newdimen\arrowinset
\arrowinset 1pt
% Some commands to manipulate parameters
\def\thinline{\treelinewidth=.3pt}
% \makedash{dimen} makes dashes of dimen length if dimen = 0pt then
% solid line
\def\makedash#1{\dashlength=#1}
\def\arrowhead#1#2#3{\arrowwidth#1\arrowlength#2\arrowinset#3}
% NODE COMMANDS
% A node defines a region of the page with a height, depth, width, and
% location of the lower left hand corner
\def\node#1#2{\leavevmode
\setbox1=\hbox{#2}\pscmd{/#1 \@int{\the\wd1} \space pt
\@int{\the\ht1} \space pt
\@int{\the\dp1} \space pt
node}\box1\relax}
% nodepoint is a specialized node with 0pt width, height, and depth
% Unlike \node is can be displaced.
% \nodepoint{nodename}[horizontal displacement][vertical displacement]
% default is current point
\def\nodepoint#1{\@ifnextchar [{\@nodepoint{#1}}{\@nodepoint{#1}[0pt][0pt]}}
\def\@nodepoint#1[#2][#3]{{\@tempdima=#2 \@tempdimb=#3%
\pscmd{/nodemargin 0 def %
/#1 \@int{\the\@tempdima}\space pt \@int{\the\@tempdimb}\space pt %
rmoveto 0 0 0 node}}}
\newtoks\pos@t \pos@t={top}
\newtoks\pos@b \pos@b={bottom}
\newtoks\pos@l \pos@l={left}
\newtoks\pos@r \pos@r={right}
\newtoks\pos@tl \pos@tl={topleft}
\newtoks\pos@tr \pos@tr={topright}
\newtoks\pos@bl \pos@bl={bottomleft}
\newtoks\pos@br \pos@br={bottomright}
% COMMANDS FOR CONNECTING NODES
% nodeconnect commands
% \nodeconnect
% \anodeconnect - arrow at toloc
% \aanodeconnect - arrow at both ends
% arguments are [fromloc]{fromnode}[toloc]{tonode}
% \nodeconnect[fromloc]{fromnode}[toloc]{tonode}
\def\nodeconnect{\@ifnextchar [{\@nodeconnect}{\@nodeconnect[b]}}
\def\@nodeconnect[#1]#2{\@ifnextchar [{\@@nodeconnect[#1]{#2}}{\@@nodeconnect[#1]{#2}[t]}}
\def\@@nodeconnect[#1]#2[#3]#4{\pscmd{%
/#2 getnode node\the\csname pos@#1\endcsname \space%
/#4 getnode node\the\csname pos@#3\endcsname\space nodeconnect}}
% \delink[fromloc]{fromnode}[toloc]{tonode}{length}
% places a bar of length perpendicular to and halfway along the line
% connecting the two locations.
\def\delink{\@ifnextchar [{\@delink}{\@delink[b]}}
\def\@delink[#1]#2{\@ifnextchar [{\@@delink[#1]{#2}}{\@@delink[#1]{#2}[t]}}
\def\@@delink[#1]#2[#3]#4#5{\@tempdima=#5%
\pscmd{/blong \@int{\the\@tempdima} \space pt def%
/#2 getnode node\the\csname pos@#1\endcsname \space%
/#4 getnode node\the\csname pos@#3\endcsname\space delink}}
% \anodeconnect[fromloc]{fromnode}[toloc]{tonode}
% The tonode has an arrow pointing to it
\def\anodeconnect{\@ifnextchar [{\@anodeconnect}{\@anodeconnect[b]}}
\def\@anodeconnect[#1]#2{\@ifnextchar [{\@@anodeconnect[#1]{#2}}{\@@anodeconnect[#1]{#2}[t]}}
\def\@@anodeconnect[#1]#2[#3]#4{\pscmd{%
/#2 getnode node\the\csname pos@#1\endcsname \space%
/#4 getnode node\the\csname pos@#3\endcsname\space arrownodeconnect}}
% \aanodeconnect[fromloc]{fromnode}[toloc]{tonode}
% double arrowed line
\def\aanodeconnect{\@ifnextchar [{\@aanodeconnect}{\@aanodeconnect[b]}}
\def\@aanodeconnect[#1]#2{\@ifnextchar [{\@@aanodeconnect[#1]{#2}}{\@@aanodeconnect[#1]{#2}[t]}}
\def\@@aanodeconnect[#1]#2[#3]#4{\pscmd{%
/#2 getnode node\the\csname pos@#1\endcsname \space%
/#4 getnode node\the\csname pos@#3\endcsname\space doublearrownodeconnect}}
% nodecurve commands
% nodecurve... no arrow
% anodecurve.. arrow at to
% aanodecurve.. arrows at to and from
% arguments:
% \..[fromloc][fromang]{fromnode}[toloc][toang]{tonode}{fdepth}[tdepth]
% defaults
% fromloc [b]
% toloc [t]
% fromang 0 (in degrees) direction is calculated counterclockwise
% toang 0 (in degrees) direction is calculated counterclockwise
% tdepth same as fdepth
% nodecurve commands set value of \@arrow, then invoke \nodecurve@
\newcount\@arrow
\newdimen\@tempdimc
\def\nodecurve{\@arrow=0\nodecurve@}
\def\anodecurve{\@arrow=1\nodecurve@}
\def\aanodecurve{\@arrow=2\nodecurve@}
\def\delinkcurve#1{\@tempdimc=#1%
\@arrow=3\nodecurve@}
\def\nodecurve@{\@ifnextchar [{\@nodecurve@}{\@nodecurve@[b]}}
\def\@nodecurve@[#1]{\@ifnextchar [{\a@nodecurve@[#1]}{\a@nodecurve@[#1][0]}}
\def\a@nodecurve@[#1][#2]#3{\@ifnextchar [{\@a@nodecurve@[#1][#2]{#3}}%
{\@a@nodecurve@[#1][#2]{#3}[t]}}
\def\@a@nodecurve@[#1][#2]#3[#4]{\@ifnextchar [{\a@a@nodecurve@[#1][#2]#3[#4]}%
{\a@a@nodecurve@[#1][#2]#3[#4][0]}}
\def\a@a@nodecurve@[#1][#2]#3[#4][#5]#6#7{\@ifnextchar [%
{\@a@a@nodecurve@[#1][#2]{#3}[#4][#5]{#6}{#7}}%
{\@a@a@nodecurve@[#1][#2]{#3}[#4][#5]{#6}{#7}[#7]}}
\def\@a@a@nodecurve@[#1][#2]#3[#4][#5]#6#7[#8]{\@tempdima=#7%
\@tempdimb=#8%
\@tempdimc=10pt%
\pscmd{/depth \@int{\the\@tempdimb} \space pt def %
/toangle \space #5 \space def %
/fromangle \space #2 \space def %
/#6 \the\csname pos@#4\endcsname cur\space %
/depth \@int{\the\@tempdima} \space pt def %
/#3 \the\csname pos@#1\endcsname cur\space %
\ifnum\@arrow=0 nodecurve \else % select & invoke PS command
\ifnum\@arrow=1 arrownodecurve \else
\ifnum\@arrow=2 arrow2nodecurve \else
/blong \@int{\the\@tempdimc} \space pt def
delinkcurve
\fi\fi\fi}}
% above is well tested below is not
\newif\iftransparent
\def\nodebox#1{\pscmd{/#1 nodebox}}
\def\nodeoval#1{\pscmd{/#1 nodeoval}}
\def\nodetriangle#1#2{\pscmd{/#1 /#2 nodetriangle}}
% \nodecircle[depth]{nodename}
\def\nodecircle{\@ifnextchar [ {\@nodecircle}{\@nodecircle[0pt]}}
\def\@nodecircle[#1]#2{\@tempdima=#1%
\iftransparent
\pscmd{\@int{\the\@tempdima}\space pt /#2 nodecircletrans}
\else
\pscmd{\@int{\the\@tempdima}\space pt /#2 nodecircle}\fi}
% \barnodeconnect[depth]{fromnode}{tonode}
\def\barnodeconnect{\@ifnextchar[ {\@barnodeconnect}{\@barnodeconnect[5pt]}}
\def\@barnodeconnect[#1]#2#3{\@tempdima=#1 \ifdim\@tempdima<0pt
\pscmd{\@int{\the\@tempdima}\space pt %
/#2 getnode nodebottom /#3 getnode nodebottom barnodeconnect}
\else
\pscmd{\@int{\the\@tempdima}\space pt %
/#2 getnode nodetop /#3 getnode nodetop barnodeconnect}
\fi}
\def\abarnodeconnect{\@ifnextchar[ {\@abarnodeconnect}{\@abarnodeconnect[5pt]}}
\def\@abarnodeconnect[#1]#2#3{\@tempdima=#1 \ifdim\@tempdima<0pt
\pscmd{\@int{\the\@tempdima}\space pt %
/#2 getnode nodebottom /#3 getnode nodebottom arrowbarnodeconnect}
% above replaces the line below.
% /#2 getnode nodebottom /#3 getnode nodebottom abarnodeconnect}
\else
\pscmd{\@int{\the\@tempdima}\space pt %
/#2 getnode nodetop /#3 getnode nodetop arrowbarnodeconnect}
\fi}
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