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% !TeX root = tikz-ext-manual.tex
% !TeX spellcheck = en_US
% Copyright 2022 by Qrrbrbirlbel
%
% This file may be distributed and/or modified
%
% 1. under the LaTeX Project Public License and/or
% 2. under the GNU Free Documentation License.
%
\section{Layers}
\begin{tikzlibrary}{ext.layers}
This library extends \tikzname's functionalities to put nodes, edges, matrices and pics
on a separate layer without having to use the \referenceEnvironmentandIndexO{pgfonlayer} environment.
\textbf{Consider this library experimental.}
If you can, avoid it and use the |pgfonlayer| environment
or change the drawing order.
\end{tikzlibrary}
\begin{multicols}{2}
\subsection{Internal keys}
\begin{key}{/tikz-ext/patch=\meta{specification}}
Since this library is experimental, its functionality needs to be activated explicitly.
The \meta{specification} is one of
\begin{itemize}
\item |node|,
\item |matrix|,
\item |pic|%
\footnote{Only the normal \referenceKeyandIndexO[/tikz/pics/]{code}
can be placed on different layers.
Both \referenceKeyandIndexO[/tikz/pics/]{background code}
and \referenceKeyandIndexO[/tikz/pics/]{foreground code}
will not be affected.},
\item |edge| or
\item |all| which applies all the patches at once.
\end{itemize}
\end{key}
These keys only work when a patch is applied but don't need to be used
since the patching activated specific
\begin{key}{/tikz-ext/layers/in box=\meta{box}}
\end{key}
\begin{key}{/tikz-ext/layers/on layer=\meta{layer}}
\end{key}
\subsection{User-level keys}
\begin{key}{/tikz/node on layer=\meta{layer}}
\end{key}
\begin{key}{/tikz/node in box=\meta{box}}
\end{key}
\begin{key}{/tikz/matrix on layer=\meta{layer}}
\end{key}
\begin{key}{/tikz/matrix in box=\meta{box}}
\end{key}
\begin{key}{/tikz/edge on layer=\meta{layer}}
\end{key}
\begin{key}{/tikz/edge in box=\meta{box}}
\end{key}
\begin{key}{/tikz/pic on layer=\meta{layer}}
\end{key}
\begin{key}{/tikz/pic in box=\meta{box}}
\end{key}
\end{multicols}
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