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%%%=====================================================
%%% @LaTeX-file{
%%% author = "Werenfried F.M. Spit",
%%% version = "1.1",
%%% date = "20/01/1999",
%%% filename = "WSartikel.cls",
%%% address = "Berberisweg 488
%%% = NL-3053 PL Rotterdam
%%% = Nederland",
%%% e-mail = "W.Spit@witbo.nl",
%%% telephone = "+31-10-4.186.136",
%%% telephone2 = "+31-70-3.700.709",
%%% telefax2 = "+31-70-3.600.098",
%%% checksum = "55762 134 325 4092",
%%% codetable = "ISO/ASCII",
%%% keywords = "LaTeX2e documentstyle",
%%% supported = "yes",
%%% abstract = "cursors in formulas",
%%% }
%%%=====================================================
%%%
%%% usage:
%%% \Lc{<formulapart>} puts a left-pointing cursor below <formulapart>;
%%% the cursorheight and width are adapted to it
%%% \Rc{<formulapart>} puts a right-pointing cursor below <formulapart>;
%%% \LRc{<p1>}{<p2>} puts a left and right-pointing cursor below <p1>
%% and <p2>
%%%
%%% if the formulapart is empty a standard width is used instead of an
%%% adapted width
%%%
%%% \cursorheight{<formula>} print <formula> and adapt the heights of the
%%% cursor(s) in it to the heigth of the complete formula
%%%
%%%
%%% all heigths and widths are calculated for display style printing
%%% all commands can be used in math mode only except
%%%
%%% \cursorformula{<formula>} print formula as displayed formula and
%%% adapt the heights of the cursor(s)in it to the heigth of the complete formula
%%%
%%% adaptable parameters:
%%%
%%% \cursorlinew line width cursor (0.5pt)
%%%
%%% version history
%%% 20 1.1 added \displaystyle to calculation of cursor width
%%% 1999/01/18 1.0 first working version
%%%
%%%
\NeedsTeXFormat{LaTeX2e}
\ProvidesFile{cursor.sty}[1999/01/20 v1.1 Specialized document class (WS)]
\newlength{\ruled}
\newlength{\ruleh}
\newlength{\rulew}
\newlength{\rulewr}
\newlength{\rulewl}
\newlength{\cursorlinew} \setlength{\cursorlinew}{0.5pt}
\def\cursorformula#1{$$\cursorheight{#1}$$}
\def\cursorheight#1{\bgroup%
\let\LRc=\relax%
\let\Lc=\relax%
\let\Rc=\relax%
\settoheight{\ruleh}{$\displaystyle #1$}\settodepth{\ruled}{$\displaystyle #1$}%
\addtolength{\ruled}{0.5ex}%
\addtolength{\ruleh}{\ruled}%
\addtolength{\ruleh}{0.5ex}%
\let\Lc=\l@cursor%
\let\Rc=\r@cursor%
\let\LRc=\lr@cursor%
#1
\egroup}
\def\L@cursor#1{%
\settoheight{\ruleh}{$\displaystyle #1$}%
\settodepth{\ruled}{$\displaystyle #1$}%
\addtolength{\ruled}{0.5ex}%
\addtolength{\ruleh}{\ruled}%
\addtolength{\ruleh}{0.5ex}
\l@cursor{#1}%
}
\def\R@cursor#1{%
\settoheight{\ruleh}{$\displaystyle #1$}%
\settodepth{\ruled}{$\displaystyle #1$}%
\addtolength{\ruled}{0.5ex}%
\addtolength{\ruleh}{\ruled}%
\addtolength{\ruleh}{0.5ex}
\r@cursor{#1}%
}
\def\LR@cursor#1#2{%
\settoheight{\ruleh}{$\displaystyle #1 #2$}%
\settodepth{\ruled}{$\displaystyle #1 #2$}%
\addtolength{\ruled}{0.5ex}%
\addtolength{\ruleh}{\ruled}%
\addtolength{\ruleh}{0.5ex}
\lr@cursor{#1}{#2}%
}
\def\l@cursor#1{\settowidth{\rulewl}{$#1$}%
\ifdim\rulewl=\z@\rulewl=1em\else\settowidth{\rulewl}{$\displaystyle #1\,$}\fi%
\,\rlap{\rule[-\ruled]{\cursorlinew}{\ruleh}%
\rule[-\ruled]{\rulewl}{\cursorlinew}}\,#1}
\def\r@cursor#1{\settowidth{\rulewr}{$#1$}%
\ifdim\rulewr=\z@\rulewr=1em\else\settowidth{\rulewr}{$\displaystyle\,#1$}\fi%
#1\,\llap{\rule[-\ruled]{\rulewr}{\cursorlinew}%
\rule[-\ruled]{\cursorlinew}{\ruleh}}\,}
\def\lr@cursor#1#2{%
\settowidth{\rulewl}{$#1$}\settowidth{\rulewr}{$#2$}%
\ifdim\rulewl=\z@\rulewl=1em\else\settowidth{\rulewl}{$\displaystyle #1\,$}\fi%
\ifdim\rulewr=\z@\rulewr=1em\else\settowidth{\rulewr}{$\displaystyle\,#2$}\fi%
#1\,\llap{\rule[-\ruled]{\rulewl}{\cursorlinew}}%
\rule[-\ruled]{\cursorlinew}{\ruleh}%
\rlap{\rule[-\ruled]{\rulewr}{\cursorlinew}}\,#2}
%\global
\global\let\Lc=\L@cursor
\global\let\Rc=\R@cursor
\global\let\LRc=\LR@cursor
\endinput
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