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-# The `ocgx2` LaTeX Package
-
-© 2015--`\today`, Alexander Grahn
-
-https://github.com/agrahn/ocgx2
-
-## Introduction
-
-This package serves as a drop-in replacement for the already existing packages
-**`ocgx`** by Paul Gaborit and **`ocg-p`** by Werner Moshammer for the creation of PDF
-Layers.
-
-It re-implements the functionality of the **`ocg`**, **`ocgx`** and **`ocg-p`** packages and
-adds support for all known engines and back-ends including:
-
-- LaTeX ⇒ dvips ⇒ ps2pdf/Distiller
-- (Xe)LaTeX ⇒ (x)dvipdfmx
-- pdfLaTeX, LuaLaTeX
-
-Also, it adds some features, improvements and bug fixes, such as package
-options, remembering option settings of re-opened OCGs, correct behaviour of
-layer switching links that were themselves placed on layers, correct listing
-of (nested) OCGs in the "Layers" tab of PDF viewers, compatibility with the
-`animate` and `media9` packages, a re-implementation of **`hyperref`**'s
-**`ocgcolorlink`** option.
-
-To enable dvipdfmx support, pass **`dvipdfmx`** globally as a class option.
-
-----
-
-*New features:*
-
-+ layers extending across **page breaks**
-+ grouping layers into **Radio Button Groups** (`ocg` environment option **`radiobtngrp=...`**)
-+ re-implementing **`hyperref`**'s **`ocgcolorlinks`** option
-
-for creating OCG coloured links, which are printed on paper in the default
-text colour and which can, unlike the original `hyperref` implementation,
-extend over **line** and **page breaks**. Moreover, with pdfLaTeX/LuaLaTeX, OCG
-coloured links can be **nested**.
-
-Coloured OCG links are enabled with
-
-````latex
-\usepackage{hyperref} % do NOT set [ocgcolorlinks] here!
-\usepackage[ocgcolorlinks]{ocgx2}
-````
-
-----
-
-`ocgx2` uses code from file `tikzlibraryocgx.code.tex` by P. Gaborit to enable
-TikZ styles for creating PDF Layers and clickable layer switching links in the
-`tikzpicture` context.
-
-Just say:
-````latex
-\usepackage[tikz]{ocgx2}
-````
-instead of
-````latex
-\usepackage{tikz}
-\usetikzlibrary{ocgx}
-````
-to enable these TikZ styles and read the `ocgx` documentation about their usage:
-````
-texdoc ocgx
-````
-The `/tikz/ocg/opts=<ocg options>` parameter adds to the list in section "How to
-add TikZ scopes into OCGs" in the `ocgx` manual. It allows passing `ocg`
-environment options (see below) to the TikZ scope.
-
-## Usage
-
-````latex
-\usepackage[<options>]{ocgx2}
-
-\begin{ocg}[<options>]{<layer name>}{<layer id>}{<initial visibility>}
-  ... material to be put on a PDF layer ...
-\end{ocg}
-````
-With `<initial visibility>` = `( on | true | 1 )  |  ( off | false | 0 )`
-
-and `<options>`:
-````
-viewocg = always | never | ifvisible
-printocg =  always | never | ifvisible
-exportocg =  always | never | ifvisible
-
-showingui= true | false
-radiobtngrp = <group name>
-tikz
-ocgcolorlinks
-````
-**not in** `ocgx`, `ocg-p`:
-
-* `showingui` (to be preferred over `listintoolbar` of `ocgx/ocg-p`)
-* `radiobtngrp = <group name>` (string; environment-only option)
-* `tikz`  (package-only option, see above)
-* `ocgcolorlinks`  (package-only option, see above)
-
-Package options have global scope. Environment options override package options
-locally.
-
-Layers can be added to one or several **Radio Button Groups** using the new option
-`radiobtngrp`. From all layers within a Radio Button Group only one can be
-enabled at a time. Enabling a layer, e. g. in the Layers tab of the PDF viewer,
-automatically hides the previously visible layer.  Option `radiobtngrp` can
-be used repeatedly for the same OCG in order to add the layer to more than one
-Radio Button Group.
-
-`ocg` environments can be nested and span multiple pages.
-
-See the `ocg-p` manual about the environment usage and the meaning of the
-remaining options:
-````
-texdoc ocg-p
-````
-
-----
-
-Clickable links for switching PDF layer visibility are created with:
-````latex
-\switchocg{<layer IDs to toggle, space separated>}{<link text>}
-\showocg{<layer IDs to switch ON, space separated>}{<link text>}
-\hideocg{<layer IDs to switch OFF, space separated>}{<link text>}
-\actionsocg{<IDs to toggle>}{<IDs to switch ON>}{<IDs to switch OFF>}{<link text>}
-````
-For details about their usage, read the `ocgx` package manual:
-````
-texdoc ocgx
-````
-For compatibility with the `ocg-p` package, the following commands have
-been provided:
-````latex
-\toggleocgs[triggerocg=...]{<layer IDs to toggle, space separated>}{<link text>}
-\showocgs[triggerocg=...]{<layer IDs to switch ON, space separated>}{<link text>}
-\hideocgs[triggerocg=...]{<layer IDs to switch OFF, space separated>}{<link text>}
-\setocgs[triggerocg=...]{<IDs to toggle>}{<IDs to switch ON>}{<IDs to switch OFF>}{<link text>}
-````
-See the `ocg-p` package manual for the meaning of `triggerocg=...`.
-
-----
-
-Breakable OCG coloured links work best with normal text as link text. If the
-link text is mixed with graphical content, such as from external files or
-inline graphics (e. g. TikZ) and even `\fbox`-ed text, these graphical parts
-must be enclosed in
-````latex
-\ocglinkprotect{...}
-````
-
-For example:
-````latex
-\href{http://ctan.org}{Visit me on \ocglinkprotect{\includegraphics{ctan-lion}}!}
-````
-
-## License
-
-This material is subject to the [LaTeX Project Public License](http://mirrors.ctan.org/macros/latex/base/lppl.txt).
-