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% slashbox.sty by Koichi Yasuoka, May 27, 1993
% minor modification by Toru Sato, May 31, 1993
\typeout{slashbox style by K.Yasuoka, May 1993.}%
\newbox\@slashboxa
\newbox\@slashboxb
\newbox\@slashboxc
\newcount\@slashboxwd
\newcount\@slashboxht
\newdimen\@slashsepl
\newdimen\@slashsepr
\def\slashbox{%
\def\@slashboxpicture##1{%
\put(0,0){\line(##1,1){\@slashboxwd}}%
\put(0,\@slashboxht){\makebox(0,0)[tl]{\box\@slashboxa}}%
\put(\@slashboxwd,0){\makebox(0,0)[br]{\box\@slashboxb}}%
}%
\@slashbox
}%
\def\backslashbox{%
\def\@slashboxpicture##1{%
\put(0,\@slashboxht){\line(##1,-1){\@slashboxwd}}%
\put(0,0){\makebox(0,0)[bl]{\box\@slashboxa}}%
\put(\@slashboxwd,\@slashboxht){\makebox(0,0)[tr]{\box\@slashboxb}}%
}%
\@slashbox
}%
\def\@slashbox{\@ifnextchar [{\@@slashbox}{\@@slashbox[0pt]}}
\def\@@slashbox[#1]{\@ifnextchar [{\@@@slashbox[#1]}{\@@@slashbox[#1][c]}}
\def\@@@slashbox[#1][#2]#3#4{%
% #1: width, #2: suppression of \tabcolsep on `l', `r', or `lr' side
% #3: left item, #4: right item
\@slashsepl=\tabcolsep
\@slashsepr=\tabcolsep
\@tfor\@tempa :=#2\do{\expandafter\let
\csname @slashsep\@tempa\endcsname=\z@}%
\setbox\@slashboxa=\hbox{\strut\hskip\tabcolsep\shortstack[l]{#3}}%
\setbox\@slashboxb=\hbox{\shortstack[r]{#4}\hskip\tabcolsep\strut}%
\setbox\@slashboxa=\hbox{\raise\dp\@slashboxa\box\@slashboxa}%
\setbox\@slashboxb=\hbox{\raise\dp\@slashboxb\box\@slashboxb}%
\setbox\@slashboxc=\hbox{%
\@tempdima=\wd\@slashboxa
\advance\@tempdima by \wd\@slashboxb
\advance\@tempdima by \@slashsepl
\advance\@tempdima by \@slashsepr
\@tempdimb=#1\relax%
\ifdim\@tempdimb>\@tempdima \@tempdima=\@tempdimb\fi%
\@tempdimb=\ht\@slashboxa
\advance\@tempdimb by \dp\@slashboxa
\advance\@tempdimb by \ht\@slashboxb
\advance\@tempdimb by \dp\@slashboxb
\@tempcnta=\@tempdima
\@tempcntb=\@tempdimb
\advance\@tempcnta by \@tempcntb
\advance\@tempcnta by -1
\divide\@tempcnta by \@tempcntb
\ifnum\@tempcnta>6 \@tempcnta=6
\@tempdimb=0.166666666\@tempdima
\else
\ifnum\@tempcnta<1 \@tempcnta=1\fi
\@tempdima=\@tempdimb
\multiply\@tempdima by \@tempcnta
\fi%
\advance\@tempdima by -\@slashsepl
\advance\@tempdima by -\@slashsepr
\@slashboxwd=\@tempdima
\@slashboxht=\@tempdimb
\@tempcntb=\@slashsepl
\setlength{\unitlength}{1sp}%
\begin{picture}(\@slashboxwd,\@slashboxht)(\@tempcntb,0)
\advance\@tempdima by \@slashsepl
\advance\@tempdima by \@slashsepr
\@slashboxwd=\@tempdima
\@slashboxpicture{\@tempcnta}
\end{picture}%
}%
$\vcenter{\box\@slashboxc}$%
}%
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