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\documentclass[a4paper]{ltxdoc}
\usepackage[breaklinks,hidelinks]{hyperref}
\usepackage{polyglossia}
\setdefaultlanguage{english}
\setlength{\leftmargini}{\parindent}
\frenchspacing
\sloppy
\begin{document}
\title{\textsf{overlays} -- incremental slides}
\author{Andreas Nolda}
\date{2016/10/24 (v.\,2.4)}
\maketitle
\noindent The \textsf{overlay} package allows to write presentations with
incremental slides. It does not presuppose any specific document class. Rather,
it is a lightweight alternative to full-fledged presentation classes like
\textsf{beamer}.
In the following, every single state of a incremental slide will be called an
\emph{overlay} of that slide.
\section{User interface}
\DescribeMacro{overlays}
\DescribeMacro{fragileoverlays}
For incremental slides, the following environments are provided:
\begin{quote}
|\begin{overlays}{|\meta{total overlay number}|}| \\
\meta{slide content} \\
|\end{overlays}|
\end{quote}
\begin{quote}
|\begin{fragileoverlays}{|\meta{total overlay number}|}| \\
\meta{slide content} \\
|\end{fragileoverlays}|
\end{quote}
The |fragileoverlays| environment should be used for incremental slides with
verbatim content.
Note that the slide content should fit on a single page.
\DescribeMacro{\alert}
\DescribeMacro{\visible}
\DescribeMacro{\only}
In the slide content, the following commands can be used in order
to specify the content of the overlays:
\begin{quote}
|\alert{|\meta{overlay specification}|}{|\meta{content}|}|
\end{quote}
\begin{quote}
|\visible{|\meta{overlay specification}|}{|\meta{content}|}|
\end{quote}
\begin{quote}
|\only{|\meta{overlay specification}|}{|\meta{content}|}|
\end{quote} Overlay specifications are either single numbers like |1|, sequences
of numbers like |1,4|, or ranges of numbers like |1-4| or |1-|.
The |\alert| command highlights its content on the specified overlays with the
|alert| color, which may be redefined by means of the |\definecolor| command.
The |\visible| command uncovers its content on the overlays which are specified
in the overlay specification. On unspecified overlays, the content still takes
up space, being rendered in the |background| color, which, by default, is white.
The content of the |\only| command is also uncovered on the overlays specified
in the overlay specification, but is absent from unspecified overlays and does
not take up space there.
\pagebreak
\DescribeMacro{\savebetweenoverlays}
The |page| and |equation| counters are not incremented between overlays. Other
counters can be saved between overlays, too, by means of the following command:
\begin{quote}
|\savebetweenoverlays{|\meta{counter name}|}|
\end{quote}
Typically, this command would be used in the preamble.
\section{Known limitations}
The |\alert|, |\visible|, and |\only| commands must not contain verbatim
commands or environments. They may be used in the content of the |alltt|
environment, though.
\section{Dependencies}
The \textsf{overlays} package requires the following packages: \textsf{color},
\textsf{environ}, and \textsf{pgffor} (part of \textsf{pgf}).
\section{Credits}
The code of the \textsf{overlays} package is inspired by Matthias Meister's
\textsf{present} package.
In addition, it uses an algorithm by Martin Scharrer for testing numbers in
numerical ranges (cf. \url{http://tex.stackexchange.com/q/19000}).
The code for saving counters between overlays as well as for overlays with
verbatim content is taken from the \textsf{texpower} package, which in turn is
based on Till Tantau's \textsf{beamer} package.
\end{document}
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