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\NeedsTeXFormat{LaTeX2e}[1995/06/01]
\ProvidesPackage{obox}[1995/09/04 vs 1.2]
%-------------------------------------------------------------------------------
% produce from #1{dimen} or #1(number) -> #1{number\unitlength}
\def\@pickonedim#1{\@ifnextchar(%)
{\@@pickonedim{#1}}{#1}}
\def\@@pickonedim#1(#2){#1{#2\unitlength}}
%-------------------------------------------------------------------------------
% redefinition of oval uit picture omgeving
% \oval[position](width,height)[optional lrtb=parts]
% position where placed:
% o midpoint (default as in LaTeX picture environment)
% t top of oval at baseline
% b bottom of oval at baseline
% c halfheight of oval at baseline
% n neutral placement
\gdef\oval{\@ifnextchar[%]
{\@oval}{\@oval[o]}}
\gdef\@oval[#1](#2,#3){\@ifnextchar[%]
{\@@oval[#1](#2,#3)}{\@@oval[#1](#2,#3)[]}}
\gdef\@@oval[#1](#2,#3)[#4]{\begingroup\boxmaxdepth \maxdimen
\@ovttrue \@ovbtrue \@ovltrue \@ovrtrue
\@tfor\reserved@a :=#4\do{\csname @ov\reserved@a false\endcsname}%
\@ovxx #2\unitlength \@ovyy #3\unitlength
\@tempdimb \ifdim\the@ovalradius=\z@
\ifdim \@ovyy >\@ovxx \@ovxx \else \@ovyy \fi
\else \the@ovalradius \fi
\advance \@tempdimb -\tw@\p@
\@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
\if#1t\@ovdx\z@\@ovdy\tw@\@ovdy\fi
\if#1b\@ovdx\z@\@ovdy\z@\fi
\if#1c\@ovdx\z@\fi
\if#1n\@ovdx\z@\@ovdy\dp\@tempboxa\fi
\ht\@tempboxa\z@ \dp\@tempboxa\z@
\@put{-\@ovdx}{-\@ovdy}{\box\@tempboxa}%
\endgroup}
%-------------------------------------------------------------------------------
% \obox[optional ovalradius(length)][optional linethickness-cmd]{box-contents}
\def\obox{\@ifnextchar[%]
{\@obox}{\@@obox[][]}}
\def\@obox[#1]{\@ifnextchar[%]
{\@@obox[#1]}{\@@obox[#1][]}}
\def\@@obox[#1][#2]#3{%
\begingroup
\@ifemptyarg{#1}{}{\ovalradius{#1}}%
\setbox\z@\hbox{\advance\fboxsep\@wholewidth \fboxrule\z@ \fbox{#3}}%
\dimen@\ht\z@ \advance\dimen@\dp\z@ #2\let\unitlength\@empty
\leavevmode\oval[n](\wd\z@,\dimen@)\box\z@
\endgroup}
%-------------------------------------------------------------------------------
\def\ovalradius{\@pickonedim\@ovalradius}
\def\@ovalradius#1{\@tempdima#1\relax
\edef\the@ovalradius{\number\@tempdima sp}\ignorespaces}
\def\ovalfraction#1{%
\edef\the@ovalradius{#1\noexpand\@tempdimb}\ignorespaces}
\ovalradius{0pt} % initialisation
%-------------------------------------------------------------------------------
\endinput
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