% \t@milli\acount\adimen converts \adimen to milli-inches
% and assigns that value to \acount (destroys \adimen)
\def\t@milli#1#2{\divide#2 by 4735 #1=#2}
\def\includepicture#1(#2,#3){%
	\begin{picture}(#2,#3)%
		\put(0,#3){\special{include .625i 1i #1.t}}%
	\end{picture}}
\let\pline@wd=\@wholewidth
\newdimen\u@plw
\def\setplinethickness#1{\@killglue\u@plw=#1\let\pline@wd\u@plw \ignorespaces}
\newdimen\last@wd
\def\set@wd{%
	\t@milli\@xarg\pline@wd
	\special{pn \the\@xarg}%
	\global\last@wd\pline@wd}
\def\check@wd{\ifdim\pline@wd=\last@wd \else \set@wd \fi}
\def\fix@wd{\set@wd \let\fix@wd\check@wd}
\def\pline(#1,#2){\@killglue\fix@wd
	\@xdim#1\unitlength
	\@ydim-#2\unitlength
	\t@milli\@xarg\@xdim \t@milli\@yarg\@ydim
	\special{pa \the\@xarg\space \the\@yarg}%
	\@ifnextchar(\pline{\special{fp}\let\next\ignorespaces}}
\def\ray(#1,#2){\@killglue\fix@wd\@xdim#1\unitlength \@ydim-#2\unitlength
	\t@milli\@xarg\@xdim \t@milli\@yarg\@ydim
	\special{pa 0 0}%
	\special{pa \the\@xarg\space \the\@yarg}%
	\special{fp}\ignorespaces}
\def\pvector(#1,#2)(#3,#4){\pline(#1,#2)(#3,#4)\arrowhead(#1,#2)(#3,#4)%
	\ignorespaces}
% LaTeX's \circle calls \@circle or \@dot (for \circle*)
\def\@circle#1{\fix@wd\@xdim=#1\unitlength \t@milli\@xarg\@xdim
	\special{ar 0 0  \the\@xarg\space \the\@xarg\space 0 6.2832}%
	\ignorespaces}
\def\ellipse#1#2{\@killglue\fix@wd
	\@xdim#1\unitlength
	\@ydim#2\unitlength
	\t@milli\@xarg\@xdim \t@milli\@yarg\@ydim
	\special{ar 0 0  \the\@xarg\space \the\@yarg\space 0 6.2832}%
	\ignorespaces}
% arc#1#2#3: center at current, radius #1, start angle #2, end angle #3
% angles in radians, arc is counterclockwise
\def\arc#1#2#3{\@killglue\fix@wd
	\@xdim=#1\unitlength \t@milli\@xarg\@xdim
	\special{ar 0 0 \the\@xarg\space \the\@xarg\space -#3 -#2}\ignorespaces}
\def\pspline(#1,#2){\@killglue\fix@wd
	\@xdim#1\unitlength
	\@ydim-#2\unitlength
	\t@milli\@xarg\@xdim \t@milli\@yarg\@ydim
	\special{pa \the\@xarg\space \the\@yarg}%
	\@ifnextchar(\pspline{\special{sp}\let\next\ignorespaces}}
\def\next{\newcount\@tempa \@tempa=}
\newcount\@cbase
\@cbase\allocationnumber \advance\@cbase1
\next'55 \next'132 \next'121 \next'112 \next'123 \next'136 \next'62
\next'77 \next'67 \next'56 \next'65 \next'76 \next'127 \next'62
\next'33 \next'131 \next'111 \next'71 \next'113 \next'135 \next'51
\next'77 \next'57 \next'55 \next'53 \next'75 \next'117 \next'51
\newcount\@sbase
\@sbase\allocationnumber \advance\@sbase1
\next0 \next0 \next0
\next1 \next1 \next1 \next1
\next2 \next2 \next2
\next3 \next3 \next3 \next3
\next4 \next4 \next4
\next5 \next5 \next5 \next5
\next6 \next6 \next6 \next6
\let\vh@inc=\z@
\chardef\v@inc='11
\def\v@loc{t}
\def\h@loc{r}
\newcount\arr@ch \arr@ch=-\@xxxii
\def\arrowhead(#1,#2)(#3,#4){{%
	\@xdim#3\unitlength \advance\@xdim-#1\unitlength
	\@ydim#4\unitlength \advance\@ydim-#2\unitlength
	\ifdim\@ydim<\z@
		\@ydim-\@ydim
		\arr@ch-\arr@ch
		\def\v@loc{b}%
		\let\v@inc\z@
	\fi
	\ifdim\@xdim<\z@
		\@xdim-\@xdim
		\arr@ch-\arr@ch
		\advance\@cbase14
		\def\h@loc{l}%
	\fi
	\ifdim\@ydim>\@xdim
		\dimen@\@ydim \@ydim\@xdim \@xdim\dimen@
		\advance\@cbase7
		\let\vh@inc=\v@inc
		\def\@tempa{\def\h@loc{l}}%
	\else	\def\@tempa{\def\v@loc{b}}%
	\fi
	\multiply\@ydim 24
	\divide\@ydim \@xdim
	\advance\@sbase \@ydim
	\ifnum\count\@sbase=\z@
		\arr@ch-\vh@inc \@tempa
	\fi
	\advance\@cbase \count\@sbase
	\advance\arr@ch \count\@cbase
	\edef\@tempa{(0,0)[\v@loc\h@loc]}%
	\put(#3,#4){\expandafter\@imakepicbox\@tempa
			{\@linefnt\char\number\arr@ch}}}}