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\documentclass[pagesize=auto, fontsize=12pt, DIV=10]{scrartcl}
\usepackage{fixltx2e}
\usepackage{etex}
\usepackage{lmodern}
\usepackage[T1]{fontenc}
\usepackage{textcomp}
\usepackage{microtype}
\usepackage{hyperref}
\newcommand*{\mail}[1]{\href{mailto:#1}{\texttt{#1}}}
\newcommand*{\pkg}[1]{\textsf{#1}}
\newcommand*{\cs}[1]{\texttt{\textbackslash#1}}
\makeatletter
\newcommand*{\cmd}[1]{\cs{\expandafter\@gobble\string#1}}
\makeatother
\newcommand*{\env}[1]{\texttt{#1}}
\newcommand*{\opt}[1]{\texttt{#1}}
\newcommand*{\meta}[1]{\textlangle\textsl{#1}\textrangle}
\renewcommand*{\labelenumi}{(\theenumi)}
\addtokomafont{title}{\rmfamily}
\title{The \pkg{shadethm} package}
\subtitle{ Shaded theorem environments in \LaTeX,\\with \cmd{\newshadetheorem} in addition to \cmd{\newtheorem}}
\author{Jim Hefferon\thanks{\mail{hefferon@smcvax.smcvt.edu}}}
\date{1999/11/23}
\begin{document}
\maketitle
\section{Usage}
Used as a \LaTeXe\ style, with \verb|\usepackage{shadethm}|, it allows declarations
of the form \verb|\newshadetheorem{theorem}{Theorem}|, so that
%
\begin{verbatim}
\begin{theorem} $e=mc^2$ \end{theorem}
\end{verbatim}
%
will produce the usual theorem, only placed in a shaded box.
\minisec{Options.}
Two come in this file:
%
\begin{description}
\item[\opt{bodymargin} (default)]
The body of the shaded text lines up with the
margins. Just as though you called \verb|newtheorem|, then colored later.
Shading falls outside the margin.
\item[\opt{shademargin}]
The shading lines up with the margins, so the body of
shaded text comes out a little thinner.
\end{description}
%
If you call it with an option not on that list then it will look for a
file \texttt{\meta{Option\-Name}.sth} and take the parameters from there. See the included
files \texttt{shadein.sth} and \texttt{colored.sth}, the first of which gives theorems that are
(like \LaTeX\ quotations) indented left and right and the second of which
gives color shading.
\section{Remarks}
\begin{enumerate}
\item You can of course have non-shaded environments, also. The \cmd{\newtheorem}
command still works.
\item Numbering within: An prior version of this style required that you
number within like this:
%
\begin{verbatim}
\newshadetheorem{thm}{Theorem}
\newshadetheorem{note}[shadethm]{Note} % No longer needed!
\end{verbatim}
%
but this one drops that requirement. If you didn't use the old version,
forget about it.
\item Uses the \pkg{graphics} package. Look for it in the \href{http://ctan.org/}{CTAN} \TeX-archive nearest
you, for instance at \href{http://tug.ctan.org/}{\texttt{tug.ctan.org}}.
\item Works with \pkg{amsthm.sty}.
\item Notice that if you say
%
\begin{verbatim}
\newshadetheorem{theorem}{Theorem}
\end{verbatim}
%
and then
%
\begin{verbatim}
\newtheorem{theorem}{Theorem}
\end{verbatim}
%
then you will get an error message since
the first allows you to say\\\verb|\begin{theorem} ...|, as does the second.
\end{enumerate}
\section{Installation}
Put this where your \TeX\ looks for \texttt{.sty} files.
There are some parameters you could set the default for (try them as is,
first).
%
\begingroup
\newcommand*{\desc}[1]{{\usekomafont{descriptionlabel}#1}\quad}%
\renewcommand*{\theenumi}{\roman{enumi}}%
\leftmargini = 1.5 \leftmargini
\begin{enumerate}
\item \label{item:i}\desc{\texttt{shadethmcolor}}
The shading color of the background. See the
documentation for the \pkg{color} package, but with a `gray' model, I~find .97
looks good out of my printer, while a darker shade like~.92 is needed
to make it copy well. (Black is~0, white is~1.)
\item[(\ref{item:i}*)] \desc{\texttt{shaderulecolor}}
The shading color of the border of the shaded box.
See (\ref{item:i}). If \cmd{\shadeboxrule} is set to 0\,pt then this won't print anyway.
\item[(\ref{item:i}**)] \desc{\cmd{\shadeboxrule}}
The width of the border around the shading. Set it to
0\,pt (not just 0) to make it disappear.
\item[(\ref{item:i}***)] \desc{\cmd{\shadeboxsep}}
The length by which the shade box surrounds the text.
\item \desc{\cmd{\shadesetinsideminipage}}
The theorems are set inside a \env{minipage} to
get line breaks, but some things, like paragraph indents, are messed
with there, so I~have a hook to reset them. Probably you can just
leave this alone.
\item The default option. Change the \verb|\ExecuteOptions{...}| right before
the \cmd{\ProcessOptions}.
\end{enumerate}
\endgroup
\minisec{Comment:}
If you get an error about `undefined color model' then you need to create
the file \texttt{color.cfg} in the same place as \texttt{color.sty}, and put in it the line
%
\begin{verbatim}
\ExecuteOptions{dvips}
\end{verbatim}
%
(or~whatever is the name of your driver). See the
documentation for the \pkg{graphics} package. I~needed this in the distant past
under N\TeX.
\section{Bugs}
\begin{enumerate}
\item Page breaks are a problem since it sets the theorem before it is shaded.
The theorem is put into a \env{minipage} in order to have the right line breaks
put in, but then can't be broken across pages. I'd be interested in any
fixes for this. DA?
\end{enumerate}
\section{License}
Copyright 1999 Jim Hefferon \mail{jim@joshua.smcvt.edu}\\
This program can redistributed and/or modified under the terms
of the \LaTeX\ Project Public License Distributed from CTAN
archives in directory \href{http://ctan.org/macros/latex/base/lppl.txt}{\nolinkurl{macros/latex/base/lppl.txt}}; either
version~1 of the License, or (at your option) any later version.
\clearpage
\section{History}
\begin{description}
\item[\texttt{99XI23} jh] Redid the parsing to stick to \cmd{\newcommand}-style calls. Needed
to put in some oppresive \cmd{\expandafter} strings.
\item[\texttt{99VII09} jh \mail{tex@joshua.smcvt.edu}] Fixed the number within situation. LPPL
added.
\item[\texttt{97I07} jh] Changed the interior of the \cmd{\DeclareOptions} to \cmd{\AtBeginDocument}
for cases where the \cmd{\textwidth} is changed.
\item[\texttt{95VI19} jh] Adapted for \LaTeXe. Now uses the \pkg{graphics} package, and all
the neat \LaTeXe\ package stuff. Still haven't rewritten the parsing code to
use the new optional arguments to \cmd{\newcommand}, though. Ah well.
\item[\texttt{94VII11} jim hefferon \mail{hefferon@smcvax.smcvt.edu}.] First written (after lots
of sporadic tries, over months; I couldn't get any of the extant shading
macros to work with theorems) from a hint in TvZ's \texttt{Fancybox} writeup.
It's all so easy once you know how.
\end{description}
\end{document}
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