% \iffalse meta-comment
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% version 1.19 (2020-05-19) on Thursday 21 May 2020 at 11:04:52
%
% decorule.dtx is copyright �� 2010-2020 by Peter Flynn <peter@silmaril.ie>
%
% This work may be distributed and/or modified under the
% conditions of the LaTeX Project Public License, either
% version 1.3 of this license or (at your option) any later
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%
% http://www.latex-project.org/lppl.txt
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%
% The current maintainer of this work is Peter Flynn <peter@silmaril.ie>
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% \advance\parskip by 0pt plus 2pt
% \parindent=0pt% \noindent
% This package implements a decorative swelled rule using
% only a symbol from a font installed with all distributions of
% \TeX{}, so it works independently, without the need to install
% any additional software or fonts.\par
% This is the packaged version of the macro which was
% originally published in the `Typographers' Inn'
% column in TUGboat \parencite{tb97}.\par
% \end{abstract}
% \clearpage
% \tableofcontents
% \clearpage
% \section*{Latest changes}
% \subsection*{v.0.7 (2020-04-01)}
% \paragraph*{Regression release}
% \begin{itemize}
% \item Updated to use ClassPack 1.19\par
% \item Switched all conformance attributes on revision
% dates to YYYY-MM-DD\par
% \item The jump in versions is because the previously
% submitted version was misnumbered as 0.6 when it
% should have been 0.06. Thanks to Erik Braun at CTAN
% for spotting this.\par
% \end{itemize}
% \subsection*{v.0.34 (2020-04-01)}
% \paragraph*{Regression release}
% \begin{itemize}
% \item Recreated package with latest version (1.18) of
% \emph{ClassPack}\par
% \item Fixed bug in using the angle counter that was
% preventing \XeLaTeX{} generating output\par
% \end{itemize}
% \subsection*{v.0.33 (2019-03-03)}
% \paragraph*{Regression release}
% \begin{itemize}
% \item Recreated package with latest version (1.13) of
% \emph{ClassPack}\par
% \end{itemize}
% \subsection*{v.0.31 (2017-02-10)}
% \paragraph*{Regression release}
% \begin{itemize}
% \item Recreated package with latest version (1.04) of
% \emph{ClassPack}\par
% \end{itemize}
% See p.\thinspace\pageref{} for earlier changes.
% \clearpage
% \section{Swelled rules}
% Swelled rules were a popular device in 19th century
% typesetting, and were usually done as special sorts from a
% typefounder, or in some cases fabricated from combinations of
% decorative brass rule cut to calculated lengths.\par
% In digital systems, they can be implemented as images or
% as glyphs in fonts, but are not usually extensible except by
% distortion. This example is constructed programmatically so
% that it could be adapted to the width it is required for (that
% feature is not implemented in this version and is left as an
% exercise to the user).\par
% \subsection{Other work}
% As discussed in the original article \parencite{tb97} there is an \textsf{swrule} package
% by Tobias Dussa \parencite{dussa} which builds a
% geometric lozenge from very fine lines, and there is a paper
% by Steve Peter \parencite{peter} which describes
% a more extensible method using \MP{} for
% Con\TeX t{}.\par
% \subsection{This solution}
% However, it is also possible to produce one using just a
% character from a font, combined with some looping in a macro
% with careful positioning and kerning. This example was
% constructed from the swung dash ({\ttfamily{}\textbackslash{}sim})
% character in math mode, rotated and scaled to fit in an
% ascending and then descending series.\par
% {\bigskip\centering{}\decorule{}\par}
% \changes{v0.25}{2012/06/15}{Changed order of paragraphs and added space}
% {\par\medskip{}The package is available on
% {\smaller CTAN} in
% \url{http://ctan.org/pkg/decorule}, and the development
% files will be available at
% \url{http://latex.silmaril.ie/packages} when the
% \textsf{classpack} toolkit is released.
% Suggestions for improving and extending this package are
% welcome.\par}
% \clearpage
% \raggedright
% \raggedright\printbibliography
% \StopEventually{\label{endcode}%
% \clearpage
% \newgeometry{left=3cm}%
% \addcontentsline{toc}{section}{Change History}%
% \label{}%
% \PrintChanges
% \clearpage
% \label{codeindex}%
% \addcontentsline{toc}{section}{Index}%
% \PrintIndex}
% \addtolength{\CPKrevmarg}{\widthof{\LabelFont{DCR@rotate}}}
% \newgeometry{left=\CPKrevmarg}
% \message{Margin reset to \the\CPKrevmarg, to fit <DCR@rotate>}
% \iffalse
%<*package>
% \fi
% \clearpage
% \section{Implementation}
% The package consists of a single main macro {\ttfamily{}\textbackslash{}decorule}, which cycles through sizes
% of the symbol from minimum to maximum, rotating and scaling
% according to values preset here; and then from the maximum
% back down to the minimum.\par
% \subsection{Auto-initialisation}\label{:autoinit}
% This section is added automatically by \textit{ClassPack}
% as a preamble to all classes and style packages.
% The \textsf{fixltx2e} package, which used to be included
% automatically, is no longer preloaded, as its
% features are now a part of the latest \LaTeXe\ kernel.\par
% The code starts with identity and requirements which are
% generated automatically as needed by the Doc\TeX\ system.
% For details see the \textsf{ltxdoc} package documentation.
% \par\smallskip
% \begingroup\color{DarkRed}\tabcolsep3pt\footnotesize
% \begin{tabular}{>{\refstepcounter{CodelineNo}\tiny\theCodelineNo}r@{\enspace}l}
% &\verb`\NeedsTeXFormat{LaTeX2e}[2009/09/24]`\\
% &\verb`\ProvidesPackage{decorule}[2020/04/01 v0.7`\\
% &\verb` A decorative swelled rule for \LaTeX{}]`
% \end{tabular}\endgroup
% \setcounter{CodelineNo}{3}
%\iffalse
%%
%% Packages required for the class or package
%%
% \fi
% \subsection{Packages required}\label{stypackages}
% \begin{CPK@package}{fix-cm}
% Allow infinitely-variable font scaling.
% \iffalse
%% Allow infinitely-variable font scaling.
% \fi
% \begin{macrocode}
\RequirePackage{fix-cm}%
% \end{macrocode}
% \end{CPK@package}
% \begin{CPK@package}{graphicx}
% Provide for graphics (PNG, JPG, or PDF format (only) for
% pdflatex; EPS format (only) for standard \LaTeX{}).
% \iffalse
%% Provide for graphics (PNG, JPG, or PDF format (only) for pdflatex; EPS format (only) for standard \LaTeX{}).
% \fi
% \begin{macrocode}
\RequirePackage{graphicx}%
% \end{macrocode}
% \end{CPK@package}
%
% \subsection{Preliminary declarations}\label{packages-here}
% \iffalse
%%
%% ******************************************************************
%%
%% Preliminary declarations
% \fi
% \begin{CPK@counter}{DCR@min}\label{counter--DCR@min}
% Define a counter and a minimum point size to start and
% end with. This value is an integer, hence a counter is
% used.\par
% \begin{macrocode}
\newcounter{DCR@min}
\setcounter{DCR@min}{1}
% \end{macrocode}
% \end{CPK@counter}
% \begin{CPK@counter}{DCR@max}\label{counter--DCR@max}
% Do the same for the maximum point size that the rule
% will get to in the middle.\par
% \begin{macrocode}
\newcounter{DCR@max}
\setcounter{DCR@max}{20}
% \end{macrocode}
% \end{CPK@counter}
% \begin{CPK@counter}{DCR@step}\label{counter--DCR@step}
% Set the step size or the increments of the glyph in
% whole points.\par
% \begin{macrocode}
\newcounter{DCR@step}
\setcounter{DCR@step}{1}
% \end{macrocode}
% \end{CPK@counter}
% \begin{CPK@counter}{DCR@rotate}\label{counter--DCR@rotate}
% Specify the amount in (whole) degrees by which we will
% need to rotate the symbol to make each glyph mesh with the
% previous one.\par
% \begin{macrocode}
\newcounter{DCR@rotate}
\setcounter{DCR@rotate}{45}
% \end{macrocode}
% \end{CPK@counter}
% \begin{CPK@counter}{DCR@size}\label{counter--DCR@size}
% Define a counter to hold the current (calculated) size
% as we loop through the sizes.\par
% \begin{macrocode}
\newcounter{DCR@size}
% \end{macrocode}
% \end{CPK@counter}
% \begin{CPK@length}{\DCR@raise}\label{length--DCR@raise}
% Define a length to hold the amount calculated at each
% step to raise/lower each glyph by (because we rotate them as
% we go).\par
% \begin{macrocode}
\newlength{\DCR@raise}
% \end{macrocode}
% \end{CPK@length}
% \begin{CPK@length}{\DCR@skip}\label{length--DCR@skip}
% Define another length to hold the amount calculated to
% backspace between successive glyphs to make sure they
% touch.\par
% \begin{macrocode}
\newlength{\DCR@skip}
% \end{macrocode}
% \end{CPK@length}
% \begin{CPK@macro}{\DCR@symbol}\label{macro--DCR@symbol}
% Lastly, define the font character to use as the glyph.
% For the swelled rule we use the swung dash.\par
% \begin{macrocode}
\newcommand{\DCR@symbol}{\ensuremath{\sim}}
% \end{macrocode}
% \end{CPK@macro}
% \subsection{The main macro}
% \iffalse
%%
%% ******************************************************************
%%
%% The main macro
% \fi
% \begin{CPK@macro}{\decorule}\label{macro--decorule}
% Now we can define the macro that does the actual
% work.\par
% \changes{v0.21}{2011/06/06}{Rearranged spacing to suit the .dtx layout}
% \begin{macrocode}
\newcommand{\decorule}{%
% \end{macrocode}
% Start by setting the initial size to the minimum size
% declared above:\par
% \begin{macrocode}
\begingroup\fontencoding{OT1}\fontfamily{cmr}\selectfont%
\setcounter{DCR@size}{\c@DCR@min}%
% \end{macrocode}
% Loop through the steps up to, but not including, the
% maximum size (this loop ends on line 28):\par
% \begin{macrocode}
\loop
% \end{macrocode}
% We want to raise each glyph above the baseline by half the
% point size that we will use, so set the amount to the
% current size and then divide by two:\par
% \begin{macrocode}
\setlength{\DCR@raise}{\c@DCR@size pt}%
\divide\DCR@raise by2
% \end{macrocode}
% Raise, rotate, and (in this case of
% {\ttfamily{}\textbackslash{}sim}) reflect the glyph in a
% {\ttfamily{}\textbackslash{}hbox} of its own point size, using
% {\ttfamily{}\textbackslash{}hss} as
% infinitely-flexible space to prevent \TeX{} squawking if
% the glyph is slightly oversized:\par
% \begin{macrocode}
\raisebox{-\DCR@raise}{\fontsize{\c@DCR@size}{0}\selectfont
\rotatebox{\the\c@DCR@rotate}{%
\reflectbox{\hbox to\c@DCR@size pt{\hss\DCR@symbol\hss}}}}%
% \end{macrocode}
% Calculate the amount to backspace as \nicefrac23 of the
% current size:\par
% \begin{macrocode}
\setlength{\DCR@skip}{\c@DCR@size pt}%
\divide\DCR@skip by3
\multiply\DCR@skip by2
\kern-\DCR@skip
% \end{macrocode}
% Increment the counter and repeat:\par
% \begin{macrocode}
\addtocounter{DCR@size}{\c@DCR@step}%
\ifnum\c@DCR@size<\c@DCR@max
\repeat
% \end{macrocode}
% Now do the same for the sole occurrence of the maximum
% size: this marks the mid-point of the rule:\par
% \begin{macrocode}
\setlength{\DCR@raise}{\c@DCR@max pt}%
\divide\DCR@raise by2
\raisebox{-\DCR@raise}{%
\fontsize{\c@DCR@max}{0}\selectfont
\rotatebox{\the\c@DCR@rotate}{\reflectbox{\hbox
to\c@DCR@max pt{\hss\DCR@symbol\hss}}}}%
% \end{macrocode}
% Start back down following the exact same pattern in
% reverse, using the current size (one step less than the
% maximum just used). The value has been left undisturbed
% from the last loop of the outward journey. This time,
% however, do the kerning \emph{before} the
% glyph.\par
% \begin{macrocode}
\loop
\setlength{\DCR@skip}{\c@DCR@size pt}%
\divide\DCR@skip by3
\multiply\DCR@skip by2
\kern-\DCR@skip
\setlength{\DCR@raise}{\c@DCR@size pt}%
\divide\DCR@raise by2
\raisebox{-\DCR@raise}{%
\fontsize{\c@DCR@size}{0}\selectfont
\rotatebox{\the\c@DCR@rotate}{\reflectbox{\hbox
to\c@DCR@size pt{\hss\DCR@symbol\hss}}}}%
\addtocounter{DCR@size}{-\c@DCR@step}%
\ifnum\c@DCR@size>\c@DCR@min
\repeat
% \end{macrocode}
% Finally, do the minimum size:\par
% \begin{macrocode}
\setlength{\DCR@skip}{\c@DCR@min pt}%
\divide\DCR@skip by3
\multiply\DCR@skip by2
\kern-\DCR@skip
\setlength{\DCR@raise}{\c@DCR@min pt}%
\divide\DCR@raise by2
\raisebox{-\DCR@raise}{%
\fontsize{\c@DCR@min}{0}\selectfont
\rotatebox{\the\c@DCR@rotate}{\reflectbox{\hbox
to\c@DCR@min pt{\hss\DCR@symbol\hss}}}}%
\endgroup}
% \end{macrocode}
% \end{CPK@macro}
% \iffalse
%</package>
% \fi
% \appendix
% \newgeometry{left=3cm}
% \clearpage
% \section{The \LaTeX{} Project Public License (v\thinspace{}1.3c)}\label{LPPL}
% \begin{quotation}\small\sffamily\parindent0pt
% \parskip.5\baselineskip
% \color{DarkBlue}\noindent
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% license document, but modification of it is not allowed.\par
% \end{quotation}
% \subsection{Preamble}\label{Preamble}
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% base \LaTeX{} packages are distributed.\par
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% {\smaller LPPL} license.\par
% If you become the Current Maintainer of the Work, you should
% immediately provide, within the Work, a prominent and
% unambiguous statement of your status as Current Maintainer. You
% should also announce your new status to the same pertinent
% community as in~item~\ref{item-intention} in the list on p.\thinspace\pageref{item-intention}
% above.\par
% \subsection{Whether and How to Distribute Works under This
% License}\label{Distribute}
% This section contains important instructions, examples, and
% recommendations for authors who are considering distributing
% their works under this license. These authors are addressed as
% `you' in this section.\par
% \subsubsection{Choosing This License or Another License}\label{Choosing}
% If for any part of your work you want or need to use
% \emph{distribution} conditions that differ
% significantly from those in this license, then do not refer to
% this license anywhere in your work but, instead, distribute
% your work under a different license. You may use the text of
% this license as a model for your own license, but your license
% should not refer to the {\smaller LPPL} or otherwise
% give the impression that your work is distributed under the
% {\smaller LPPL}.\par
% The document {\ttfamily{}modguide.tex} in the base \LaTeX{}
% distribution explains the motivation behind the conditions of
% this license. It explains, for example, why distributing
% \LaTeX{} under the {\smaller GNU} General Public
% License ({\smaller GPL}) was considered inappropriate.
% Even if your work is unrelated to \LaTeX{}, the discussion in
% {\ttfamily{}modguide.tex} may still be
% relevant, and authors intending to distribute their works
% under any license are encouraged to read it.\par
% \subsubsection{A Recommendation on Modification Without
% Distribution}\label{WithoutDistribution}
% It is wise never to modify a component of the Work, even
% for your own personal use, without also meeting the above
% conditions for distributing the modified component. While you
% might intend that such modifications will never be
% distributed, often this will happen by accident~--- you may
% forget that you have modified that component; or it may not
% occur to you when allowing others to access the modified
% version that you are thus distributing it and violating the
% conditions of this license in ways that could have legal
% implications and, worse, cause problems for the community. It
% is therefore usually in your best interest to keep your copy
% of the Work identical with the public one. Many works provide
% ways to control the behavior of that work without altering any
% of its licensed components.\par
% \subsubsection{How to Use This License}\label{HowTo}
% To use this license, place in each of the components of
% your work both an explicit copyright notice including your
% name and the year the work was authored and/or last
% substantially modified. Include also a statement that the
% distribution and/or modification of that component is
% constrained by the conditions in this license.\par
% Here is an example of such a notice and statement:\par
% \iffalse
%<*ignore>
% \fi
\begin{lstlisting}[language={[LaTeX]TeX}]
%%% pig.dtx
%%% Copyright 2005 M. Y. Name
%%
%% This work may be distributed and/or modified under the
%% conditions of the LaTeX Project Public License, either version 1.3
%% of this license or (at your option) any later version.
%% The latest version of this license is in
%% http://www.latex-project.org/lppl.txt
%% and version 1.3 or later is part of all distributions of LaTeX
%% version 2005/12/01 or later.
%%
%% This work has the LPPL maintenance status `maintained'.
%%
%% The Current Maintainer of this work is M. Y. Name.
%%
%% This work consists of the files pig.dtx and pig.ins
%% and the derived file pig.sty.
\end{lstlisting}
% \iffalse
%</ignore>
% \fi
% Given such a notice and statement in a file, the
% conditions given in this license document would apply, with
% the `Work' referring to the three files
% {\ttfamily{}pig.dtx}, {\ttfamily{}pig.ins}, and {\ttfamily{}pig.sty} (the last being generated
% from {\ttfamily{}pig.dtx} using {\ttfamily{}pig.ins}), the `Base
% Interpreter' referring to any
% `\LaTeX{}-Format', and both `Copyright
% Holder' and `Current Maintainer'
% referring to the person
% M.~Y.~Name\index{!}.\par
% If you do not want the Maintenance section of
% {\smaller LPPL} to apply to your Work, change
% `maintained' above into
% `author-maintained'. However, we recommend that
% you use `maintained' as the Maintenance
% section was added in order to ensure that your Work remains
% useful to the community even when you can no longer maintain
% and support it yourself.\par
% \subsubsection{Derived Works That Are Not Replacements}\label{NotReplacements}
% Several clauses of the {\smaller LPPL} specify
% means to provide reliability and stability for the user
% community. They therefore concern themselves with the case
% that a Derived Work is intended to be used as a (compatible or
% incompatible) replacement of the original Work. If this is not
% the case (e.g., if a few lines of code are reused for a
% completely different task), then clauses 6b and 6d shall not
% apply.\par
% \subsubsection{Important Recommendations}\label{Recommendations}
% \paragraph[Defining What Constitutes the Work]{Defining What Constitutes the Work��:}
% The {\smaller LPPL} requires that distributions
% of the Work contain all the files of the Work. It is
% therefore important that you provide a way for the licensee
% to determine which files constitute the Work. This could,
% for example, be achieved by explicitly listing all the files
% of the Work near the copyright notice of each file or by
% using a line such as:\par
% \iffalse
%<*ignore>
% \fi
\begin{lstlisting}[language={[LaTeX]TeX}]
%% This work consists of all files listed in manifest.txt.
\end{lstlisting}
% \iffalse
%</ignore>
% \fi
% in that place. In the absence of an unequivocal list it
% might be impossible for the licensee to determine what is
% considered by you to comprise the Work and, in such a case,
% the licensee would be entitled to make reasonable
% conjectures as to which files comprise the Work.\par
% \Finale