/usr/share/texlive/texmf-dist/tex/plain/treetex/l_pic.tex is in texlive-plain-extra 2014.20141024-1.
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% picture environment. No changes!!!
% It is needed if you want to use TreeTeX together with plain TeX.
\catcode`\@=11
\def\@height{height}
\def\@depth{depth}
\def\@width{width}
\font\tenln=line10
\font\tencirc=circle10
\font\tenlnw=linew10
\font\tencircw=circlew10
\newcount\@tempcnta
\newcount\@tempcntb
\newdimen\@tempdima
\newdimen\@tempdimb
\newbox\@tempboxa
\def\@whilenoop#1{}
\def\@whiledim#1\do #2{\ifdim #1\relax#2\@iwhiledim{#1\relax#2}\fi}
\def\@iwhiledim#1{\ifdim #1\let\@nextwhile=\@iwhiledim
\else\let\@nextwhile=\@whilenoop\fi\@nextwhile{#1}}
\def\@ifnextchar#1#2#3{\let\@tempe #1\def\@tempa{#2}\def\@tempb{#3}\futurelet
\@tempc\@ifnch}
\def\@ifnch{\ifx \@tempc \@sptoken \let\@tempd\@xifnch
\else \ifx \@tempc \@tempe\let\@tempd\@tempa\else\let\@tempd\@tempb\fi
\fi \@tempd}
% NOTE: the following hacking must precede the definition of \:
% as math medium space.
\def\:{\let\@sptoken= } \: % this makes \@sptoken a space token
\def\:{\@xifnch} \expandafter\def\: {\futurelet\@tempc\@ifnch}
\def\@ifstar#1#2{\@ifnextchar *{\def\@tempa*{#1}\@tempa}{#2}}
\let\:=\>
% ****************************************
% * THE PICTURE ENVIRONMENT *
% ****************************************
%
% \unitlength = value of dimension argument
% \@wholewidth = current line width
% \@halfwidth = half of current line width
% \@linefnt = font for drawing lines
% \@circlefnt = font for drawing circles
%
% \linethickness{DIM} : Sets the width of horizontal and vertical lines
% in a picture to DIM. Does not change width of slanted lines
% or circles. Width of all lines reset by \thinlines and
% \thicklines
%
% \picture(XSIZE,YSIZE)(XORG,YORG)
% BEGIN
% \@picht :=L YSIZE * \unitlength
% box \@picbox :=
% \hbox to XSIZE * \unitlength
% {\hskip -XORG * \unitlength
% \lower YORG * \unitlength
% \hbox{
% END
%
% \endpicture ==
% BEGIN
% } \hss }
% heigth of \@picbox := \@picht
% depth of \@picbox := 0
% leavevmode
% \box\@picbox
% END
%
% \put(X, Y){OBJ} ==
% BEGIN
% \@killglue
% \raise Y * \unitlength \hbox to 0pt { \hskip X * \unitlength
% OBJ \hss }
% \ignorespaces
% END
%
% \multiput(X,Y)(DELX,DELY){N}{OBJ} ==
% BEGIN
% \@killglue
% \@multicnt := N
% \@xdim := X * \unitlength
% \@ydim := Y * \unitlength
% while \@multicnt > 0
% do \raise \@ydim \hbox to 0pt { \hskip \@xdim
% OBJ \hss }
% \@multicnt := \@multicnt - 1
% \@xdim := \@xdim + DELX * \unitlength
% \@ydim := \@ydim + DELY * \unitlength
% od
% \ignorespaces
% END
%
% \shortstack[POS]{TEXT} : Makes a \vbox containing TEXT stacked as
% a one-column array, positioned l, r or c as indicated by POS.
\newdimen\@wholewidth
\newdimen\@halfwidth
\newdimen\unitlength \unitlength =1pt
\newbox\@picbox
\newdimen\@picht
\def\picture(#1,#2){\@ifnextchar({\@picture(#1,#2)}{\@picture(#1,#2)(0,0)}}
\def\@picture(#1,#2)(#3,#4){\@picht #2\unitlength
\setbox\@picbox\hbox to #1\unitlength\bgroup
\hskip -#3\unitlength \lower #4\unitlength \hbox\bgroup}
\def\endpicture{\egroup\hss\egroup\ht\@picbox\@picht
\dp\@picbox\z@\leavevmode\box\@picbox}
\long\def\put(#1,#2)#3{\@killglue\raise#2\unitlength\hbox to \z@{\hskip
#1\unitlength #3\hss}\ignorespaces}
\long\def\multiput(#1,#2)(#3,#4)#5#6{\@killglue\@multicnt=#5\relax
\@xdim=#1\unitlength
\@ydim=#2\unitlength
\@whilenum \@multicnt > 0\do
{\raise\@ydim\hbox to \z@{\hskip
\@xdim #6\hss}\advance\@multicnt \m@ne\advance\@xdim
#3\unitlength\advance\@ydim #4\unitlength}\ignorespaces}
\def\@killglue{\unskip\@whiledim \lastskip >\z@\do{\unskip}}
\def\thinlines{\let\@linefnt\tenln \let\@circlefnt\tencirc
\@wholewidth\fontdimen8\tenln \@halfwidth .5\@wholewidth}
\def\thicklines{\let\@linefnt\tenlnw \let\@circlefnt\tencircw
\@wholewidth\fontdimen8\tenlnw \@halfwidth .5\@wholewidth}
\def\linethickness#1{\@wholewidth #1\relax \@halfwidth .5\@wholewidth}
\def\shortstack{\@ifnextchar[{\@shortstack}{\@shortstack[c]}}
\def\@shortstack[#1]{\leavevmode
\vbox\bgroup\baselineskip-1pt\lineskip 3pt\let\mb@l\hss
\let\mb@r\hss \expandafter\let\csname mb@#1\endcsname\relax
\let\\\@stackcr\@ishortstack}
\def\@ishortstack#1{\halign{\mb@l ##\unskip\mb@r\cr #1\crcr}\egroup}
\def\@stackcr{\@ifstar{\@ixstackcr}{\@ixstackcr}}
\def\@ixstackcr{\@ifnextchar[{\@istackcr}{\cr\ignorespaces}}
\def\@istackcr[#1]{\cr\noalign{\vskip #1}\ignorespaces}
% \line(X,Y){LEN} ==
% BEGIN
% \@xarg := X
% \@yarg := Y
% \@linelen := LEN * \unitlength
% if \@xarg = 0
% then \@vline
% else if \@yarg = 0
% then \@hline
% else \@sline
% if
% if
% END
%
% \@sline ==
% BEGIN
% if \@xarg < 0
% then @negarg := T
% \@xarg := -\@xarg
% \@yyarg := -\@yarg
% else @negarg := F
% \@yyarg := \@yarg
% fi
% \@tempcnta := |\@yyarg|
% if \@tempcnta > 6
% then error: 'LATEX ERROR: Illegal \line or \vector argument.'
% \@tempcnta := 0
% fi
% \box\@linechar := \hbox{\@linefnt \@getlinechar(\@xarg,\@yyarg) }
% if \@yarg > 0 then \@upordown = \raise
% \@clnht := 0
% else \@upordown = \lower
% \@clnht := height of \box\@linechar
% fi
% \@clnwd := width of \box\@linechar
% if @negarg
% then \hskip - width of \box\@linechar
% \@tempa == \hskip - 2* width of box \@linechar
% else \@tempa == \relax
% fi
% %% Put out integral number of line segments
% while \@clnwd < \@linelen
% do \@upordown \@clnht \copy\@linechar
% \@tempa
% \@clnht := \@clnht + ht of \box\@linechar
% \@clnwd := \@clnwd + width of \box\@linechar
% od
%
% %% Put out last segment
% \@clnht := \@clnht - height of \box\@linechar
% \@clnwd := \@clnwd - width of \box\@linechar
% \@tempdima := \@linelen - \@clnwd
% \@tempdimb := \@tempdima - width of \box\@linechar
% if @negarg then \hskip -\@tempdimb
% else \hskip \@tempdimb
% fi
% \@tempdima := 1000 * \@tempdima
% \@tempcnta := \@tempdima / width of \box\@linechar
% \@tempdima := (\@tempcnta * ht of \box\@linechar)/1000
% \@clnht := \@clnht + \@tempdima
% if \@linelen < width of box\@linechar
% then \hskip width of box\@linechar
% else \hbox{\@upordown \@clnht \copy\@linechar}
% fi
% END
%
% \@hline ==
% BEGIN
% if \@xarg < 0 then \hskip -\@linelen \fi
% \vrule height \@halfwidth depth \@halfwidth width \@linelen
% if \@xarg < 0 then \hskip -\@linelen \fi
% END
%
% \@vline == if \@yarg < 0 \@downline else \@upline fi
%
%
% \@getlinechar(X,Y) ==
% BEGIN
% \@tempcnta := 8*X - 9
% if Y > 0
% then \@tempcnta := \@tempcnta + Y
% else \@tempcnta := \@tempcnta - Y + 64
% fi
% \char\@tempcnta
% END
%
% \vector(X,Y){LEN} ==
% BEGIN
% \@xarg := X
% \@yarg := Y
% \@linelen := LEN * \unitlength
% if \@xarg = 0
% then \@vvector
% else if \@yarg = 0
% then \@hvector
% else \@svector
% if
% if
% END
%
% \@hvector ==
% BEGIN
% \@hline
% {\@linefnt if \@xarg < 0 then \@getlarrow(1,0)
% else \@getrarrow(1,0)
% fi}
% END
%
% \@vvector == if \@yarg < 0 \@downvector else \@upvector fi
%
% \@svector ==
% BEGIN
% \@sline
% \@tempcnta := |\@yarg|
% if \@tempcnta < 5
% then \hskip - width of \box\@linechar
% \@upordown \@clnht \hbox
% {\@linefnt
% if @negarg then \@getlarrow(\@xarg,\@yyarg)
% else \@getrarrow(\@xarg,\@yyarg)
% fi }
% else error: 'LATEX ERROR: Illegal \line or \vector argument.'
% fi
% END
%
% \@getlarrow(X,Y) ==
% BEGIN
% if Y = 0
% then \@tempcnta := '33
% else \@tempcnta := 16 * X - 9
% \@tempcntb := 2 * Y
% if \@tempcntb > 0
% then \@tempcnta := \@tempcnta + \@tempcntb
% else \@tempcnta := \@tempcnta - \@tempcntb + 64
% fi
% fi
% \char\@tempcnta
% END
%
% \@getrarrow(X,Y) ==
% BEGIN
% \@tempcntb := |Y|
% case of \@tempcntb
% 0 : \@tempcnta := '55
% 1 : if X < 3
% then \@tempcnta := 24*X - 6
% else if X = 3
% then \@tempcnta := 49
% else \@tempcnta := 58 fi
% fi
% 2 : if X < 3
% then \@tempcnta := 24*X - 3
% else \@tempcnta := 51 % X must = 3
% fi
% 3 : \@tempcnta := 16*X - 2
% 4 : \@tempcnta := 16*X + 7
% endcase
% if Y < 0
% then \@tempcnta := \@tempcnta + 64
% fi
% \char\@tempcnta
% END
\newif\if@negarg
\def\line(#1,#2)#3{\@xarg #1\relax \@yarg #2\relax
\@linelen=#3\unitlength
\ifnum\@xarg =0 \@vline
\else \ifnum\@yarg =0 \@hline \else \@sline\fi
\fi}
\def\@sline{\ifnum\@xarg< 0 \@negargtrue \@xarg -\@xarg \@yyarg -\@yarg
\else \@negargfalse \@yyarg \@yarg \fi
\ifnum \@yyarg >0 \@tempcnta\@yyarg \else \@tempcnta -\@yyarg \fi
\ifnum\@tempcnta>6 \@badlinearg\@tempcnta0 \fi
\setbox\@linechar\hbox{\@linefnt\@getlinechar(\@xarg,\@yyarg)}%
\ifnum \@yarg >0 \let\@upordown\raise \@clnht\z@
\else\let\@upordown\lower \@clnht \ht\@linechar\fi
\@clnwd=\wd\@linechar
\if@negarg \hskip -\wd\@linechar \def\@tempa{\hskip -2\wd\@linechar}\else
\let\@tempa\relax \fi
\@whiledim \@clnwd <\@linelen \do
{\@upordown\@clnht\copy\@linechar
\@tempa
\advance\@clnht \ht\@linechar
\advance\@clnwd \wd\@linechar}%
\advance\@clnht -\ht\@linechar
\advance\@clnwd -\wd\@linechar
\@tempdima\@linelen\advance\@tempdima -\@clnwd
\@tempdimb\@tempdima\advance\@tempdimb -\wd\@linechar
\if@negarg \hskip -\@tempdimb \else \hskip \@tempdimb \fi
\multiply\@tempdima \@m
\@tempcnta \@tempdima \@tempdima \wd\@linechar \divide\@tempcnta \@tempdima
\@tempdima \ht\@linechar \multiply\@tempdima \@tempcnta
\divide\@tempdima \@m
\advance\@clnht \@tempdima
\ifdim \@linelen <\wd\@linechar
\hskip \wd\@linechar
\else\@upordown\@clnht\copy\@linechar\fi}
\def\@hline{\ifnum \@xarg <0 \hskip -\@linelen \fi
\vrule \@height \@halfwidth \@depth \@halfwidth \@width \@linelen
\ifnum \@xarg <0 \hskip -\@linelen \fi}
\def\@getlinechar(#1,#2){\@tempcnta#1\relax\multiply\@tempcnta 8
\advance\@tempcnta -9 \ifnum #2>0 \advance\@tempcnta #2\relax\else
\advance\@tempcnta -#2\relax\advance\@tempcnta 64 \fi
\char\@tempcnta}
\def\vector(#1,#2)#3{\@xarg #1\relax \@yarg #2\relax
\@linelen=#3\unitlength
\ifnum\@xarg =0 \@vvector
\else \ifnum\@yarg =0 \@hvector \else \@svector\fi
\fi}
\def\@hvector{\@hline\hbox to 0pt{\@linefnt
\ifnum \@xarg <0 \@getlarrow(1,0)\hss\else
\hss\@getrarrow(1,0)\fi}}
\def\@vvector{\ifnum \@yarg <0 \@downvector \else \@upvector \fi}
\def\@svector{\@sline
\@tempcnta\@yarg \ifnum\@tempcnta <0 \@tempcnta=-\@tempcnta\fi
\ifnum\@tempcnta <5
\hskip -\wd\@linechar
\@upordown\@clnht \hbox{\@linefnt \if@negarg
\@getlarrow(\@xarg,\@yyarg) \else \@getrarrow(\@xarg,\@yyarg) \fi}%
\else\@badlinearg\fi}
\def\@getlarrow(#1,#2){\ifnum #2 =\z@ \@tempcnta='33\else
\@tempcnta=#1\relax\multiply\@tempcnta \sixt@@n \advance\@tempcnta
-9 \@tempcntb=#2\relax\multiply\@tempcntb \tw@
\ifnum \@tempcntb >0 \advance\@tempcnta \@tempcntb\relax
\else\advance\@tempcnta -\@tempcntb\advance\@tempcnta 64
\fi\fi\char\@tempcnta}
\def\@getrarrow(#1,#2){\@tempcntb=#2\relax
\ifnum\@tempcntb < 0 \@tempcntb=-\@tempcntb\relax\fi
\ifcase \@tempcntb\relax \@tempcnta='55 \or
\ifnum #1<3 \@tempcnta=#1\relax\multiply\@tempcnta
24 \advance\@tempcnta -6 \else \ifnum #1=3 \@tempcnta=49
\else\@tempcnta=58 \fi\fi\or
\ifnum #1<3 \@tempcnta=#1\relax\multiply\@tempcnta
24 \advance\@tempcnta -3 \else \@tempcnta=51\fi\or
\@tempcnta=#1\relax\multiply\@tempcnta
\sixt@@n \advance\@tempcnta -\tw@ \else
\@tempcnta=#1\relax\multiply\@tempcnta
\sixt@@n \advance\@tempcnta 7 \fi\ifnum #2<0 \advance\@tempcnta 64 \fi
\char\@tempcnta}
\def\@vline{\ifnum \@yarg <0 \@downline \else \@upline\fi}
\def\@upline{\hbox to \z@{\hskip -\@halfwidth \vrule \@width \@wholewidth
\@height \@linelen \@depth \z@\hss}}
\def\@downline{\hbox to \z@{\hskip -\@halfwidth \vrule \@width \@wholewidth
\@height \z@ \@depth \@linelen \hss}}
\def\@upvector{\@upline\setbox\@tempboxa\hbox{\@linefnt\char'66}\raise
\@linelen \hbox to\z@{\lower \ht\@tempboxa\box\@tempboxa\hss}}
\def\@downvector{\@downline\lower \@linelen
\hbox to \z@{\@linefnt\char'77\hss}}
% \dashbox{D}(X,Y) ==
% BEGIN
% leave vertical mode
% \hbox to 0pt {
% \baselineskip := 0pt
% \lineskip := 0pt
% %% HORIZONTAL DASHES
% \@dashdim := X * \unitlength
% \@dashcnt := \@dashdim + 200 % to prevent roundoff error
% \@dashdim := D * \unitlength
% \@dashcnt := \@dashcnt / \@dashdim
% if \@dashcnt is odd
% then \@dashdim := 0pt
% \@dashcnt := (\@dashcnt + 1) / 2
% else \@dashdim := \@dashdim / 2
% \@dashcnt := \@dashcnt / 2 - 1
% \box\@dashbox := \hbox{\vrule height \@halfwidth
% depth \@halfwidth width \@dashdim}
% \put(0,0){\copy\@dashbox}
% \put(0,Y){\copy\@dashbox}
% \put(X,0){\hskip -\@dashdim\copy\@dashbox}
% \put(X,Y){\hskip -\@dashdim\box\@dashbox}
% \@dashdim := 3 * \@dashdim
% fi
% \box\@dashbox := \hbox{\vrule height \@halfwidth
% depth \@halfwidth width D * \unitlength
% \hskip D * \unitlength}
% \@tempcnta := 0
% \put(0,0){\hskip \@dashdim
% while \@tempcnta < \@dascnt
% do \copy\@dashbox
% \@tempcnta := \@tempcnta + 1
% od
% }
% \@tempcnta := 0
% put(0,Y){\hskip \@dashdim
% while \@tempcnta < \@dascnt
% do \copy\@dashbox
% \@tempcnta := \@tempcnta + 1
% od
% }
%
% %% vertical dashes
% \@dashdim := Y * \unitlength
% \@dashcnt := \@dashdim + 200 % to prevent roundoff error
% \@dashdim := D * \unitlength
% \@dashcnt := \@dashcnt / \@dashdim
% if \@dashcnt is odd
% then \@dashdim := 0pt
% \@dashcnt := (\@dashcnt + 1) / 2
% else \@dashdim := \@dashdim / 2
% \@dashcnt := \@dashcnt / 2 - 1
% \box\@dashbox := \hbox{\hskip -\@halfwidth
% \vrule width \@wholewidth
% height \@dashdim }
% \put(0,0){\copy\@dashbox}
% \put(X,0){\copy\@dashbox}
% \put(0,Y){\lower\@dashdim\copy\@dashbox}
% \put(X,Y){\lower\@dashdim\copy\@dashbox}
% \@dashdim := 3 * \@dashdim
% fi
% \box\@dashbox := \hbox{\vrule width \@wholewidth
% height D * \unitlength }
% \@tempcnta := 0
% put(0,0){\hskip -\halfwidth
% \vbox{while \@tempcnta < \@dashcnt
% do \vskip D*\unitlength
% \copy\@dashbox
% \@tempcnta := \@tempcnta + 1
% od
% \vskip \@dashdim
% } }
% \@tempcnta := 0
% put(X,0){\hskip -\halfwidth
% \vbox{while \@tempcnta < \@dashcnt
% do \vskip D*\unitlength
% \copy\@dashbox
% \@tempcnta := \@tempcnta + 1
% od
% \vskip \@dashdim
% }
% }
% } % END DASHES
%
% \@imakepicbox(X,Y)
% END
\def\dashbox#1(#2,#3){\leavevmode\hbox to \z@{\baselineskip \z@%
\lineskip \z@%
\@dashdim=#2\unitlength%
\@dashcnt=\@dashdim \advance\@dashcnt 200
\@dashdim=#1\unitlength\divide\@dashcnt \@dashdim
\ifodd\@dashcnt\@dashdim=\z@%
\advance\@dashcnt \@ne \divide\@dashcnt \tw@
\else \divide\@dashdim \tw@ \divide\@dashcnt \tw@
\advance\@dashcnt \m@ne
\setbox\@dashbox=\hbox{\vrule \@height \@halfwidth \@depth \@halfwidth
\@width \@dashdim}\put(0,0){\copy\@dashbox}%
\put(0,#3){\copy\@dashbox}%
\put(#2,0){\hskip-\@dashdim\copy\@dashbox}%
\put(#2,#3){\hskip-\@dashdim\box\@dashbox}%
\multiply\@dashdim 3
\fi
\setbox\@dashbox=\hbox{\vrule \@height \@halfwidth \@depth \@halfwidth
\@width #1\unitlength\hskip #1\unitlength}\@tempcnta=0
\put(0,0){\hskip\@dashdim \@whilenum \@tempcnta <\@dashcnt
\do{\copy\@dashbox\advance\@tempcnta \@ne }}\@tempcnta=0
\put(0,#3){\hskip\@dashdim \@whilenum \@tempcnta <\@dashcnt
\do{\copy\@dashbox\advance\@tempcnta \@ne }}%
\@dashdim=#3\unitlength%
\@dashcnt=\@dashdim \advance\@dashcnt 200
\@dashdim=#1\unitlength\divide\@dashcnt \@dashdim
\ifodd\@dashcnt \@dashdim=\z@%
\advance\@dashcnt \@ne \divide\@dashcnt \tw@
\else
\divide\@dashdim \tw@ \divide\@dashcnt \tw@
\advance\@dashcnt \m@ne
\setbox\@dashbox\hbox{\hskip -\@halfwidth
\vrule \@width \@wholewidth
\@height \@dashdim}\put(0,0){\copy\@dashbox}%
\put(#2,0){\copy\@dashbox}%
\put(0,#3){\lower\@dashdim\copy\@dashbox}%
\put(#2,#3){\lower\@dashdim\copy\@dashbox}%
\multiply\@dashdim 3
\fi
\setbox\@dashbox\hbox{\vrule \@width \@wholewidth
\@height #1\unitlength}\@tempcnta0
\put(0,0){\hskip -\@halfwidth \vbox{\@whilenum \@tempcnta < \@dashcnt
\do{\vskip #1\unitlength\copy\@dashbox\advance\@tempcnta \@ne }%
\vskip\@dashdim}}\@tempcnta0
\put(#2,0){\hskip -\@halfwidth \vbox{\@whilenum \@tempcnta< \@dashcnt
\relax\do{\vskip #1\unitlength\copy\@dashbox\advance\@tempcnta \@ne }%
\vskip\@dashdim}}}\@makepicbox(#2,#3)}
% CIRCLES AND OVALS
%
% USER COMMANDS:
%
% \circle{D} : Produces the circle with the diameter as close as
% possible to D * \unitlength. \put(X,Y){\circle{D}}
% puts the circle with its center at (X,Y).
%
% \oval(X,Y) : Makes an oval as round as possible that fits in the
% rectangle of width X * \unitlength and height
% Y * \unitlength. The reference point is the center.
%
% \oval(X,Y)[POS] : Save as \oval(X,Y) except it draws only the
% half or quadrant of the oval indicated by POS.
% E.G., \oval(X,Y)[t] draws just the top half
% and \oval(X,Y)[br] draws just the bottom right
% quadrant. In all cases, the reference point is
% the same as the unqualified \oval(X,Y) command.
%
% \@ovvert {DELTA1} {DELTA2} : Makes a vbox containing either the left side
% or the right side of the oval being constructed. The baseline
% will coincide with the outside bottom edge of the oval; the left
% side of the box will coincide with the left edge of the vertical
% rule. The width of the box will be \@tempdima.
% DELTA1 and DELTA2 are added to the character number in \@tempcnta
% to get the characters for the top and bottom quarter circle pieces.
%
% \@ovhorz : Makes an hbox containing the straight rule for either the
% top or the bottom of the oval being constructed. The baseline
% will coincide with bottom edge of the rule; the left side of
% the box will coincide with the left side of the oval.
% The width of the box will be \@ovxx.
%
% \@getcirc {DIAM} : Sets \@tempcnta to the character number
% of the top-right quarter circle with the largest
% diameter less than or equal to DIAM.
% Sets \@tempboxa to an hbox containing that character.
% Sets \@tempdima to \wd \@tempboxa, which is the distance
% from the circle's left outside edge to its right
% inside edge.
% (These characters are like those described in the
% TeXbook, pp. 389-90.)
%
% \@getcirc {DIAM} ==
% BEGIN
% \@tempcnta := integer coercion of DIAM
% \@tempcnta := \@tempcnta / integer coercion of 4pt
% if \@tempcnta > 10
% then \@tempcnta := 10 fi
% if \@tempcnta > 0
% then \@tempcnta := \@tempcnta-1
% else LaTeX Warning: Oval too small.
% fi
% \@tempcnta := 4 * \@tempcnta
% \@tempboxa := \hbox{\@circlefnt \char \@tempcnta}
% \@tempdima := \wd \@tempboxa
% END
%
% \@put{X}{Y}{OBJ} ==
% BEGIN
% \raise Y \hbox to 0pt{\hskip X OBJ \hss}
% END
%
% \@oval(X,Y)[POS] ==
% BEGIN
% \begingroup
% \boxmaxdepth := \maxdimen
% @ovt := @ovb := @ovl := @ovr := true
% for all E in POS
% do @ovE := false od
% \@ovxx := X * \unitlength
% \@ovyy := Y * \unitlength
% \@tempdimb := min(\@ovxx,\@ovyy)
% \@getcirc{\@tempdimb}
% \@ovro := \ht \@tempboxa
% \@ovri := \dp \@tempboxa
% \@ovdx := \@ovxx - \@tempdima
% \@ovdx := \@ovdx/2
% \@ovdy := \@ovyy - \@tempdima
% \@ovdy := \@ovyy/2
% \@circlefnt
% \@tempboxa :=
% \hbox{
% if @ovr
% then \@ovvert{3}{2} \kern -\@tempdima
% fi
% if @ovl
% then \kern \@ovxx \@ovvert{0}{1} \kern -\@tempdima
% \kern -\@ovxx
% fi
% if @ovt
% then \@ovhorz \kern -\@ovxx
% fi
% if @ovb
% then \raise \@ovyy \@ovhorz
% fi
% }
% \@ovdx := \@ovdx + \@ovro
% \@ovdy := \@ovdy + \@ovro
% \ht\@tempboxa := \dp\@tempboxa := 0
% \@put{-\@ovdx}{-\@ovdy}{\box\@tempboxa}
% \endgroup
% END
%
% \@ovvert {DELTA1} {DELTA2} ==
% BEGIN
% \vbox to \@ovyy {
% if @ovb
% then \@tempcntb := \@tempcnta + DELTA1
% \kern -\@ovro
% \hbox { \char \@tempcntb }
% \nointerlineskip
% else \kern \@ovri \kern \@ovdy
% fi
% \leaders \vrule width \@wholewidth \vfil
% \nointerlineskip
% if @ovt
% then \@tempcntb := \@tempcnta + DELTA2
% \hbox { \char \@tempcntb }
% else \kern \@ovdy \kern \@ovro
% fi
% }
% END
%
% \@ovhorz ==
% BEGIN
% \hbox to \@ovxx{
% \kern \@ovro
% if @ovr
% then
% else \kern \@ovdx
% fi
% \leaders \hrule height \@wholewidth \hfil
% if @ovl
% then
% else \kern \@ovdx
% fi
% \kern \@ovri
% }
% END
%
% \circle{DIAM} ==
% BEGIN
% \begingroup
% \boxmaxdepth := maxdimen
% \@tempdimb := DIAM *\unitlength
% if \@tempdimb > 15.5pt
% then \@getcirc{\@tempdimb}
% \@ovro := \ht \@tempboxa
% \@tempboxa := \hbox{
% \@circlefnt
% \@tempcnta := \@tempcnta + 2
% \char \@tempcnta
% \@tempcnta := \@tempcnta - 1
% \char \@tempcnta
% \kern -2\@tempdima
% \@tempcnta := \@tempcnta + 2
% \raise \@tempdima \hbox { \char \@tempcnta }
% \raise \@tempdima \box\@tempboxa
% }
% \ht\@tempboxa := \dp\@tempboxa := 0
% \@put{-\@ovro}{-\@ovro}{\@tempboxa}
% else
% \@circ{\@tempdimb}{96}
% fi
% \endgroup
% END
%
% \circle*{DIAM} == \@dot{DIAM} == \@circ{DIAM*\unitlength}{112}
%
% \@circ{DIAM}{CHAR} ==
% BEGIN
% \@tempcnta := integer coercion of (DIAM + .5pt)/1pt.
% if \@tempcnta > 15 then \@tempcnta := 15 fi
% if \@tempcnta > 1 then \@tempcnta := \@tempcnta - 1 fi
% \@tempcnta := \@tempcnta + CHAR
% \@circlefnt
% \char \@tempcnta
% END
%
\newif\if@ovt
\newif\if@ovb
\newif\if@ovl
\newif\if@ovr
\newdimen\@ovxx
\newdimen\@ovyy
\newdimen\@ovdx
\newdimen\@ovdy
\newdimen\@ovro
\newdimen\@ovri
\def\@getcirc#1{\@tempdima #1\relax \@tempcnta\@tempdima
\@tempdima 4pt\relax \divide\@tempcnta\@tempdima
\ifnum \@tempcnta > 10\relax \@tempcnta 10\relax\fi
\ifnum \@tempcnta >\z@ \advance\@tempcnta\m@ne
\else \@warning{Oval too small}\fi
\multiply\@tempcnta 4\relax
\setbox \@tempboxa \hbox{\@circlefnt
\char \@tempcnta}\@tempdima \wd \@tempboxa}
\def\@put#1#2#3{\raise #2\hbox to \z@{\hskip #1#3\hss}}
\def\oval(#1,#2){\@ifnextchar[{\@oval(#1,#2)}{\@oval(#1,#2)[]}}
\def\@oval(#1,#2)[#3]{\begingroup\boxmaxdepth \maxdimen
\@ovttrue \@ovbtrue \@ovltrue \@ovrtrue
\@tfor\@tempa :=#3\do{\csname @ov\@tempa false\endcsname}\@ovxx
#1\unitlength \@ovyy #2\unitlength
\@tempdimb \ifdim \@ovyy >\@ovxx \@ovxx\else \@ovyy \fi
\@getcirc \@tempdimb
\@ovro \ht\@tempboxa \@ovri \dp\@tempboxa
\@ovdx\@ovxx \advance\@ovdx -\@tempdima \divide\@ovdx \tw@
\@ovdy\@ovyy \advance\@ovdy -\@tempdima \divide\@ovdy \tw@
\@circlefnt \setbox\@tempboxa
\hbox{\if@ovr \@ovvert32\kern -\@tempdima \fi
\if@ovl \kern \@ovxx \@ovvert01\kern -\@tempdima \kern -\@ovxx \fi
\if@ovt \@ovhorz \kern -\@ovxx \fi
\if@ovb \raise \@ovyy \@ovhorz \fi}\advance\@ovdx\@ovro
\advance\@ovdy\@ovro \ht\@tempboxa\z@ \dp\@tempboxa\z@
\@put{-\@ovdx}{-\@ovdy}{\box\@tempboxa}%
\endgroup}
\def\@ovvert#1#2{\vbox to \@ovyy{%
\if@ovb \@tempcntb \@tempcnta \advance \@tempcntb by #1\relax
\kern -\@ovro \hbox{\char \@tempcntb}\nointerlineskip
\else \kern \@ovri \kern \@ovdy \fi
\leaders\vrule width \@wholewidth\vfil \nointerlineskip
\if@ovt \@tempcntb \@tempcnta \advance \@tempcntb by #2\relax
\hbox{\char \@tempcntb}%
\else \kern \@ovdy \kern \@ovro \fi}}
\def\@ovhorz{\hbox to \@ovxx{\kern \@ovro
\if@ovr \else \kern \@ovdx \fi
\leaders \hrule height \@wholewidth \hfil
\if@ovl \else \kern \@ovdx \fi
\kern \@ovri}}
\def\circle{\@ifstar{\@dot}{\@circle}}
\def\@circle#1{\begingroup \boxmaxdepth \maxdimen \@tempdimb #1\unitlength
\ifdim \@tempdimb >15.5pt\relax \@getcirc\@tempdimb
\@ovro\ht\@tempboxa
\setbox\@tempboxa\hbox{\@circlefnt
\advance\@tempcnta\tw@ \char \@tempcnta
\advance\@tempcnta\m@ne \char \@tempcnta \kern -2\@tempdima
\advance\@tempcnta\tw@
\raise \@tempdima \hbox{\char\@tempcnta}\raise \@tempdima
\box\@tempboxa}\ht\@tempboxa\z@ \dp\@tempboxa\z@
\@put{-\@ovro}{-\@ovro}{\box\@tempboxa}%
\else \@circ\@tempdimb{96}\fi\endgroup}
\def\@dot#1{\@tempdimb #1\unitlength \@circ\@tempdimb{112}}
\def\@circ#1#2{\@tempdima #1\relax \advance\@tempdima .5pt\relax
\@tempcnta\@tempdima \@tempdima 1pt\relax
\divide\@tempcnta\@tempdima
\ifnum\@tempcnta > 15\relax \@tempcnta 15\relax \fi
\ifnum \@tempcnta >\z@ \advance\@tempcnta\m@ne\fi
\advance\@tempcnta #2\relax
\@circlefnt \char\@tempcnta}
%INITIALIZATION
\thinlines
\newcount\@xarg
\newcount\@yarg
\newcount\@yyarg
\newcount\@multicnt
\newdimen\@xdim
\newdimen\@ydim
\newbox\@linechar
\newdimen\@linelen
\newdimen\@clnwd
\newdimen\@clnht
\newdimen\@dashdim
\newbox\@dashbox
\newcount\@dashcnt
%
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