%%
%% This is file `curves.sty',
%% generated with the docstrip utility.
%%
%% The original source files were:
%%
%% curves.dtx  (with options: `package')
%% Copyright (C) 1991-2008 Ian Maclaine-cross
%% This file may be distributed under the terms of the
%% LaTeX Project Public License.
%% See file curves.dtx for details.
%% Internet: imaclain@gmail.com
\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{curves}
        [2009/08/31 1.53 Curves for LaTeX picture environment]

\catcode`\;=11

\newcount\;sc
\newcount\;scp
\newcount\;t
\newcount\;cc
\newcount\;cnd
\newcount\;mcnd
\newcount\;np
\newcount\;overhang
\newcount\;pbs
\newcount\;pns
\newcount\;psc
\newcount\;rc
\newcount\;rtc
\newcount\;tc
\let\;tca=\@tempcnta
\let\;tcb=\@tempcntb

\newlength\csdiameter
\newlength\curvelength
\newlength\overhang
\newlength\;x
\newlength\;dx
\newlength\;ddx
\newlength\;y
\newlength\;dy
\newlength\;ddy
\newlength\;pl
\newlength\;ucd
\let\;td=\@tempdima
\let\;ytd=\@tempdimb

\newsavebox{\;csbox}
\newsavebox{\;pt}

\newif\if;noopt  \;noopttrue
\newif\ifcurvewarn \curvewarntrue
\newif\ifstraight
\newif\if;ccn
\newif\if;pt
\newif\if;csym
\newif\if;scnt

\newhelp\;strline{curve straight from}
\newhelp\m;ssingcoord{curve needs more points, add them.}
\newhelp\;negdash{curvedashes needs the same sign for all arguments.}
\newhelp\;oddcoord{curve requires two co-ordinates for each point,
  count them.}

\newcommand\;linewidth[1]{}
\newcommand\;startline{}
\newcommand\;stopl;ne{}

\newcommand\;optioncheck[2]{%
  \DeclareOption{#1}{%
    \if;noopt
      #2\;nooptfalse
    \else
      \PackageError{curves}{Option
      \CurrentOption\space ignored}{curves uses only one dvi option}%
    \fi
  }%
}

\newcommand\;setdisk{\@killglue \;linewidth\@wholewidth
   \set;pt{}\let\;stopline\;stopl;ne}
\newcommand\s;tpitch{\;td\patternresolution\p@ \;psc\;td}

\;optioncheck{dvips}{
  \renewcommand\;linewidth[1]{\special{em:linewidth \the#1}}%
  \renewcommand\;startline{\special{em:moveto}}%
  \renewcommand\;stopl;ne{\special{em:lineto}}%
}

\;optioncheck{emtex}{
  \renewcommand\;linewidth[1]{\special{em:linewidth \the#1}}%
  \renewcommand\;startline{\special{em:moveto}}%
  \renewcommand\;stopl;ne{\special{em:lineto}}%
  \renewcommand\;setdisk{\@killglue
    \ifdim\@halfwidth>\p@
      \set;pt{\@circ\@wholewidth{112}}\;linewidth{\wd\;pt}%
      \s;tcirc{\unhbox\;pt}%
    \else \;linewidth\@wholewidth \set;pt{}\fi \let\;stopline\;stopl;ne}
}

\;optioncheck{xdvi}{
  \special{!/;L{1 256.96 div dup scale 1 setlinecap
    setlinewidth newpath 0 0 moveto lineto stroke}def}%
  \newcount\;wc
  \newlength\;X
  \newlength\;Y
  \renewcommand\;linewidth[1]{\;wc#1}%
  \renewcommand\;startline{\global\;X\;x \global\;Y\;y}%
  \renewcommand\;stopl;ne{%
    \;tca\;X \advance\;tca-\;x \;tcb\;Y \advance\;tcb-\;y
    \divide\;tca\@cclvi \divide\;tcb\@cclvi \divide\;wc\@cclvi
    \special{"\the\;tca\space \the\;tcb\space \the\;wc\space ;L}%
    \;startline
  }%
}

\;optioncheck{WML}{
  \renewcommand\;linewidth[1]{\special{W \the#1}}%
  \renewcommand\;startline{\special{M}}%
  \renewcommand\;stopl;ne{\special{L}}%
  \;nooptfalse
}

\let\;optioncheck\relax
\ProcessOptions\relax

\if;noopt

\newcount\;wc
\newlength\;X
\newlength\;Y

\newcommand\;setperiod{\;tcb
  \ifdim\@halfwidth>.6\p@ 17\;td.7
  \else \ifdim\@wholewidth>.85\p@ 12\;td.48
    \else \ifdim\@wholewidth>.6\p@ 8\else 5\fi \;td.34
    \fi
  \fi \p@
  \s;tcirc{\rm \fontseries m\fontshape n\fontsize{\the\;tcb}\p@
    \selectfont \hss.}}%

\renewcommand\;setdisk{\@killglue \ifdim\@halfwidth>.85\p@
    \s;tcirc{\@circ{\@wholewidth}{112}}\;td\@wholewidth
    \divide\;td 8\advance\;td.6\p@ \ifdim\;td>\thr@@\p@\;td\thr@@\p@\fi
  \else \;setperiod \fi \let\;stopline\;stopl;ne}%

\renewcommand\s;tpitch{\;ytd\diskpitchstretch\;td \;wc\;ytd
  \;td\patternresolution\p@ \;psc\;td }

\renewcommand\;startline{\global\;X\;x \global\;Y\;y}

\renewcommand\;stopl;ne{%
  \;td\;X \advance\;td-\;x \;ytd\;Y \advance\;ytd-\;y
  \;startline \;rxya\;td\;ytd \divide\;rc\;wc
  \ifnum\;rc>\z@ \advance\;rc\@ne
    \divide\;td\;rc \divide\;ytd\;rc \;y\z@
    \advance\;rc\m@ne \;tca\;rc
    \let\n;xt\;ls \;ls \kern-\;rc\;td
  \fi}

\newcommand\;ls{\advance\;y\;ytd \kern\;td \raise\;y\copy\;pt
  \advance\;tca\m@ne \ifnum\;tca=\z@ \let\n;xt\relax \fi \n;xt}

\fi

\newcommand\arc[1][0]{\;arc[#1]}
\newcommand\;arc{}
\def\;arc[#1](#2,#3)#4{\;setpoint{#1}\scaleput(#2,#3){\;ddx
  -#3\unitlength \;ddy#2\unitlength \;firstpoint \;td#4\p@ \;drwarc}}

\def\bezier#1)#2(#3)#4({\@bezier#1)(#3)(}
\def\@bezier#1(#2,#3)(#4,#5)(#6,#7){\;dx#4\unitlength \;ddx-\;dx
  \advance\;dx-#2\unitlength \advance\;ddx#6\unitlength
  \;dy#5\unitlength \;ddy-\;dy \advance\;dy-#3\unitlength
  \advance\;ddy#7\unitlength
  \;setpoint{#1}\scaleput(#2,#3){\;firstpoint \;bezier}}

\newcommand\bigcircle[2][0]{\;setpoint{#1}\;dx\unitlength
  \global\divide\unitlength\tw@
  \scaleput(#2,0){\;startline \;ddx\z@ \;ddy#2\unitlength
  \global\unitlength\;dx \;td360\p@ \;drwarc}}

\newcommand\closecurve[1][0]{\;closecurve[#1]}
\newcommand\;closecurve{}
\def\;closecurve[#1](#2){\;coordn\closecurve\thr@@{#2}{#1}%
  \if;ccn\scaleput(\;xb,\;yb){\;startline
    \edef\;ci{\;xa,\;ya,#2,\;xb,\;yb,\;xc,\;yc}%
    \advance\;cc\thr@@ \;tagcurve\;ci}\fi}

\newcommand\curve[1][0]{\;curve[#1]}
\newcommand\;curve{}
\def\;curve[#1](#2){\;coordn\curve\tw@{#2}{#1}%
  \if;ccn \scaleput(\;xa,\;ya){\;firstpoint
    \ifnum\;cc=\tw@ \;slbezd \;slbez
    \else \;scbezd\;dx\;ddx\;xa\;xb\;xc \;scbezd\;dy\;ddy\;ya\;yb\;yc
      \;bezier \;tagcurve{#2}\ifnum\;cc>6\;endcurve\fi \fi}\fi}
\newcommand\;scbezd[5]{\;slcd#2#3#5\divide#24\;slcd#1#3#4\advance#1-#2}
\newcommand\;xa{} \newcommand\;xb{} \newcommand\;xc{}
\newcommand\;ya{} \newcommand\;yb{} \newcommand\;yc{}
\newcommand\;ci{}

\newcommand\curvesymbol[1]{\def\;curvesymbol{#1}\ch;ckcs
  \global\sbox\;csbox{#1}\csdiameter\wd\;csbox}
\newcommand\;curvesymbol{} \def\;curvesymbol{}

\newcommand\curvedashes[2][\unitlength]{\;ucd#1\def\;icurvedashes{#2}%
  \;ccnfalse \;pl\z@
  \@for \;ci:=#2\do{\ifdim\;ci\;ucd<\z@ \;ccntrue
      \PackageError{curves}{\string
      \curvedashes\space sign bad at \;ci\MessageBreak}{\the\;negdash}%
    \else \advance\;pl\;ci\;ucd \fi}\if;ccn\;pl\z@\fi}
\newcommand\;icurvedashes{}

\newcommand\tagcurve[1][0]{\;tgcrv[#1]}
\newcommand\;tgcrv{}
\def\;tgcrv[#1](#2){\;coordn\tagcurve\thr@@{#2}{#1}\if;ccn
  \scaleput(\;xb,\;yb){\;firstpoint \;tagcurve{#2}}\fi}

\newcommand\scaleput{}
\long\def\scaleput(#1,#2)#3{\@killglue \;td#2\unitlength
  \raise\yscale\;td \hbox to \z@{\kern\xscaley\;td \;td#1\unitlength
  \kern\xscale\;td \raise\yscalex\;td \hbox{#3}\hss}\ignorespaces}
\newcommand\xscale{\@ne}
\newcommand\xscaley{0}
\newcommand\yscale{\@ne}
\newcommand\yscalex{0}

\newcommand\diskpitchstretch{\@ne}
\newcommand\patternresolution{\@ne}

\newcommand\;firstpoint{\;startline \ifdim\;pl=\z@\;point\relax\fi}

\newcommand\;drwarc{\;cc\;td \;np\;td \;td23\p@ \divide\;cc\;td
  \;abs\;cc \advance\;cc\@ne \;pns\p@ \divide\;pns\tw@
  \divide\;np\;cc \;rc\;np \divide\;rc\;pns \;abs\;rc
  \advance\;rc\@ne \divide\;np\;rc \multiply\;np\;pns \divide\;np14668 %
  \multiply\;np\;rc \divide\;np\@cclvi \;scp\p@ \multiply\;scp\@cclvi
  \;t\;pns \;csi\;csi\;csi\;csi \;rxya\;ddx\;ddy \divide\;rc\p@
  \advance\;rc\@ne \;rtc\;rc \advance\;rc\;rc \;ndd\;ddx \;ndd\;ddy
  \;csi \;rxya\;ddx\;ddy \divide\;rc\;pns \advance\;rc\@ne
  \@whilenum\;cc>\z@ \do{\advance\;cc\m@ne \;dx\;ddx \;dy\;ddy
    \divide\;ddx\;rc \divide\;ddy\;rc \;td\;ddx \;ddx\;t\;td
    \advance\;ddx-\;np\;ddy \;ddy\;t\;ddy \advance\;ddy\;np\;td
    \divide\;ddx\;pns \divide\;ddy\;pns \;ddx\;rc\;ddx \;ddy\;rc\;ddy
    {\;bezier \global\;td\;x \global\;ytd\;y
          \global\;tca\;overhang}\;y\;ytd \;x\;td \;overhang\;tca}}
\newcommand\;ndd[1]{\divide#1\;rc \multiply#1\;np
  \divide#1\;t #1\;rtc#1}
\newcommand\;csi{\;tcb\;np \multiply\;np\;t \divide\;np\;pns \;t\;tcb
  \multiply\;t\;t \divide\;t-\;scp \advance\;t\;pns \divide\;scp4 }

\newcommand\;coordn[4]{\;setpoint{#4}\ifx#1\closecurve\;cc\tw@
  \else\;cc\z@\fi
  \@for\;ci:=#3\do{\advance\;cc\@ne
    \ifcase\;cc \or \;d;f\;xa \or \;d;f\;ya \or \;d;f\;xb
      \or \;d;f\;yb \or \;d;f\;xc \or \;d;f\;yc \fi
    \ifx#1\closecurve\ifodd\;cc \;d;f\;xa \else \;d;f\;ya \fi\fi}%
  \;ccnfalse \ifx#1\closecurve \advance\;cc-\tw@ \fi
  \ifodd\;cc
    \PackageError{curves}{\string #1\space points odd}{\the\;oddcoord}%
  \else \divide\;cc\tw@
    \ifnum#2>\;cc \PackageError{curves}{\string #1\space needs \the#2
        points\MessageBreak}{\the\m;ssingcoord}%
    \else \;ccntrue \fi\fi}

\newcommand\;setpoint[1]{\curvelength\z@ \let\;stopline\relax
  \def\;point##1{\raise\;y\hbox{{\copy\;pt##1}}}\ch;ckcs
  \ifnum#1=\z@\;scntfalse\else\;scnttrue\fi
  \;sc#1\relax \;abs\;sc \;psc\;sc
  \ifdim\;pl>\z@ \;overhang\overhang
    \ifnum\;overhang=\z@\else \;np\;overhang
      \divide\;np\;pl \multiply\;np\;pl
      \ifnum\;overhang<\z@ \advance\;overhang\;pl
      \else \ifnum\;overhang=\;np\advance\;overhang\;pl\fi
      \fi \advance\;overhang-\;np \fi
    \if;csym \if;scnt\;setdisk\else\;setsymbol\fi
    \else \;setdisk \fi\s;tpitch
 \else\ifnum#1>\z@
    \s;tcirc{\hss\vrule\@height\@wholewidth\@width\@wholewidth}%
  \else\ifnum#1<\z@ \if;csym\;setsymbol\else\set;pt{}\fi
  \else\;setdisk\s;tpitch
  \fi\fi\fi \;x\z@ \;y\dp\;pt \advance\;y-\ht\;pt \divide\;y\tw@}
\newcommand\;setsymbol{\s;tcirc{\hss\unhcopy\;csbox}%
  \edef\;point{\;point\relax
  \s;tcirc{\hss\noexpand\;curvesymbol}\global\setbox\;csbox\copy\;pt}}
\newcommand\;stopline{} \newcommand\;point{}

\newcommand\ch;ckcs{\ifx\;curvesymbol\@empty\;csymfalse
  \else\;csymtrue\fi}

\newcommand\s;tcirc[1]{\set;pt to\z@{#1\hss}}

\newcommand\set;pt{\global\setbox\;pt\hbox}

\newcommand\;endcurve{\;ecbezd\;dx\;ddx\;xa\;xb\;xc
  \;ecbezd\;dy\;ddy\;ya\;yb\;yc \;bezier}
\newcommand\;ecbezd[5]{\;slcd#1#3#5\divide#14
  #2-#1\advance#2#5\unitlength
  \advance#2-#4\unitlength}

\newcommand\;tagcurve[1]{\ifnum\;cc=\thr@@ \;endcurve \else \;cc\z@
  \@for\;ci:=#1\do{\advance\;cc\@ne \ifnum\;cc>6 %
    \ifodd\;cc \;slcd\;dx\;xa\;xc \let\;xa\;xb \let\;xb\;xc \;d;f\;xc
    \else \t;gcrv \fi \fi}\fi}

\newcommand\t;gcrv{\;slcd\;dy\;ya\;yc
  \let\;ya\;yb \let\;yb\;yc \;d;f\;yc
  \;rxy\;dx\;dy \divide\;dx\;rtc \divide\;dy\;rtc
  \;ddx-\;ya\;dx \advance\;ddx\;xa\;dy \;ddy\;ddx
  \advance\;ddx\;yb\;dx \advance\;ddx-\;xb\;dy
  \advance\;ddy\;yc\;dx \advance\;ddy-\;xc\;dy
  \;slbezd \;td\;ddy \divide\;td\@m
  \ifdim\;td=\z@ \ifcurvewarn
    \PackageWarning{curves}{\the\;strline\MessageBreak
       \;xa,\;ya\space to \;xb,\;yb\MessageBreak}\fi
      \;slbez
  \else \;td\unitlength \;rtc\;td \advance\;rtc\;rtc
    \divide\;rtc\p@ \advance\;rtc\@ne \divide\;td\;rtc
    \;t\;ddx \;scp\;t \;abs\;t
    \advance\;t\;t \divide\;t\p@ \advance\;t\@ne \divide\;scp\;t
    \multiply\;td\;scp \divide\;td\;ddy
    \multiply\;td\;rtc \multiply\;td\;t
    \;ddx\;xc\;td \advance\;ddx-\;xa\;td \advance\;dx-\;ddx
    \;ddy\;yc\;td \advance\;ddy-\;ya\;td \advance\;dy-\;ddy
    \;bezier \fi}

\newcommand\;d;f[1]{\edef#1{\;ci}}

\newcommand\;slbezd{\;slcd\;dx\;xa\;xb \;slcd\;dy\;ya\;yb}

\newcommand\;slcd[3]{#1#3\unitlength \advance#1-#2\unitlength}

\newcommand\;slbez{\divide\;dx\tw@ \;ddx\;dx \divide\;dy\tw@
  \;ddy\;dy \;bezier}

\newcommand\;bezier{\ifstraight \av;d\;dx\;ddx \av;d\;dy\;ddy \fi
  \;scale\;dx\;dy \;scp\;rc \;scale\;ddx\;ddy
  \advance\;scp\;rc \;bezc\;dx\;ddx \;bezc\;dy\;ddy  \;rxy\;ddx\;ddy
  \divide\;rc\p@ \advance\;rc\thr@@
  \;tc\;rc \ifnum\;rc>\sixt@@n\;rc\sixt@@n\fi
  \;rroot\;rroot\;rroot\;rroot
  \;t\;rc \;rxy\;dx\;dy \advance\;rc\;scp \divide\;rc\thr@@
  \global\advance\curvelength\;rc sp\;mcnd\@ne
  \ifdim\;pl>\z@ \;np\;rc \divide\;np\;psc
    \ifnum\;t<\;np \;mcnd\;np \divide\;mcnd\;t
      \divide\;np\;mcnd \multiply\;np\;mcnd \;t\;np
    \fi
  \fi
  \if;scnt
    \ifdim\;pl=\z@ \;t\;sc
    \else \;np
      \if;csym \;rc \divide\;np\;sc \advance\;np-\csdiameter
        \;td\;pl \divide\;td\tw@ \advance\;np\;td \divide\;np\;pl
        \ifnum\;np<\@ne\;np\@ne\fi \multiply\;np\;sc
      \else \;sc
      \fi
      \advance\;t\;np \divide\;t\;np \multiply\;t\;np
    \fi
  \fi
  \;rtc\;t \divide\;rtc\;mcnd \;tcb\;rtc \multiply\;tcb\;t
  \advance\;rtc\m@ne \multiply\;rtc\;t \;tc\;t \advance\;tc\;tc
  \;bezd\;dx\;ddx \;bezd\;dy\;ddy
  \ifdim\;pl>\z@ \;dashes \else \let\n;xt\;spoints \;spoints \fi}
\newcommand\av;d[2]{\advance#1#2\divide#1\tw@#2#1}
\newcommand\;scale[2]{\;td\xscale#1\advance\;td\xscaley#2%
  #2\yscale#2\advance#2\yscalex#1#1\;td \;rxy#1#2}
\newcommand\;bezc[2]{\advance#1#1\advance#2#2%
  \;td#2\advance#2-#1\advance#1\;td}
\newcommand\;bezd[2]{\divide#2\;tcb \;td#2\multiply\;td\;rtc
  \advance#1-\;td \divide#1\;tc}

\newcommand\;spoints{\advance\;y\;dy \advance\;x\;dx \kern\;dx
  \;point\;stopline \advance\;t\m@ne
  \ifnum\;t>\z@ \advance\;dx\;ddx \advance\;dy\;ddy
  \else \let\n;xt\relax \fi \n;xt}

\newcommand\;rxy[2]{\;rxya#1#2%
  \ifnum\;rc>\z@ \;rtc\;rc \advance\;rtc\;rtc \divide\;rtc\p@
    \ifnum\;rtc>\z@ \advance\;rtc\@ne \divide\;tc\;rtc
      \divide\;tcb\;rtc \divide\;rc\;rtc
    \else \;rtc\@ne
    \fi
    \multiply\;tc\;tc \multiply\;tcb\;tcb
    \advance\;tc\;tcb \;rroot\;rroot \multiply\;rc\;rtc
  \fi}

\newcommand\;rxya[2]{\;tc#1\;abs\;tc \;tcb#2\;abs\;tcb
  \ifnum\;tc>\;tcb \;rc\;tcb \;tcb\;tc \;tc\;rc \fi
  \;rc\;tc \divide\;rc\thr@@ \advance\;rc\;tcb
}

\newcommand\;abs[1]{\ifnum#1<\z@ #1-#1\fi}

\newcommand\;rroot{\;tcb\;tc \divide\;tcb\;rc
  \advance\;rc\;tcb \divide\;rc\tw@}

\newcommand\;dashes{\let\;ticd\;icurvedashes
  \let\;tucd\;ucd \divide\;rc\;t
  \;rtc\;t \;tc\;rc \advance\;tc\csdiameter \divide\;tc\;rc
   \divide\;tc\tw@ \;t\;tc \multiply\;tc\tw@ \;ptfalse \;cnd\;mcnd
  \;pbs\;rc \divide\;pbs\tw@
  \advance\;overhang\;pbs \divide\;overhang-\;rc
  \if;scnt \;scdashes \else \;nscdashes \fi \multiply\;overhang\;rc}

\newcommand\;scdashes{\;pbs\;rtc \divide\;pbs\;sc \;ccss \;scp
  \if;csym \;pl \multiply\;scp\;np \divide\;scp\;sc \advance\;pbs-\;tc
  \else \;pbs \multiply\;scp\;rc \fi \;np\;overhang \;overhang\z@
  \divide\;scp\;pbs \;tcb\z@ \;pns\;t \;dash \;overhang\;np
  \if;csym\else \advance\;overhang-\;tcb \advance\;rtc-\;tcb
    \advance\;pbs-\;tc \fi
  \;pns\;pbs \advance\;pns-\;np \if;csym\else\advance\;pns\;tcb\fi
  \@whilenum\;rtc>\z@\do{\;pdashes \;ptfalse \;t\;tc \;pns\;t \;dash
    \;pns\;pbs \;overhang\if;csym\;np\else-\;overhang\fi
    \advance\;pns-\;overhang}\;overhang-\if;csym\;np\else\;overhang
      \;ptfalse \;t\;tc \;tcb\;overhang
      \divide\;t\tw@ \;rtc\;t \;pns\;t \;dash \fi}

\newcommand\;nscdashes{\advance\;pbs\;pl \divide\;pbs\;rc
  \if;csym \;bpdashes \fi \;ccss \;pns\;t
  \;dash \advance\;pbs-\;tc \;scp\;pl \divide\;scp\;pbs \;pns\;pbs
  \@whilenum\;rtc>\z@\do{\;pdashes \;ptfalse \;t\;tc \;pns\;t \;dash
    \;pns\;pbs}%
  \if;csym \else \divide\;tc\tw@ \advance\;overhang\;tc \fi}

\newcommand\;ccss{\ifnum\;pbs>\;tc\else \;bpdashes \fi}

\newcommand\;bpdashes{\let\;tucd\;pl \let\;ticd\;ricd \;tc\z@ \;t\z@}
\newcommand\;ricd{1,0}

\newcommand\;pdashes{\ifnum\;pns>\z@ \;td\z@ \;tcb\z@ \;ptfalse
    \@for\;ci:=\;ticd \do{\advance\;td\;ci\;tucd \;t\;scp \divide\;t\tw@
      \advance\;t\;td \divide\;t\;scp  \advance\;t-\;tcb \;dash
      \if;pt\;ptfalse\else\;pttrue\fi}%
  \let\n;xt\;pdashes \else \let\n;xt\relax \fi \n;xt}

\newcommand\;dash{\ifnum\;t=\z@
    \if;csym \ifnum\;rtc>\z@ \if;pt\;point\;startline\fi \fi \fi
  \else \advance\;tcb\;t \advance\;pns-\;t
    \ifnum\;overhang<\z@ \advance\;overhang\;t
      \;t \ifnum\;overhang<\z@ \z@ \else \;overhang \;overhang\;tcb \fi
    \else \;overhang\;tcb \fi
    \ifnum\;pns<\z@ \advance\;overhang\;pns \advance\;tcb\;pns
      \advance\;t\;pns \;pns\z@ \fi \advance\;rtc-\;t
      \ifnum\;rtc<\z@ \advance\;overhang\;rtc \advance\;t\;rtc\fi
      \ifnum\;t>\z@ \if;pt\;point\;startline\fi
      \let\n;xt\;points \;points \fi\fi}

\newcommand\;points{\ifnum\;t<\;cnd \;tca\;t \else \;tca\;cnd \fi
  \advance\;y\;tca\;dy \;ytd\;tca\;dx \advance\;x\;ytd \kern\;ytd
  \if;pt\;point\;stopline\fi
  \ifnum\;t<\;cnd \let\n;xt\relax \advance\;cnd-\;t
  \else
    \advance\;t-\;cnd \advance\;dx\;ddx \advance\;dy\;ddy \;cnd\;mcnd
  \fi \n;xt}

 \catcode`\;=12

\endinput
%%
%% End of file `curves.sty'.
