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+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%%% This file is a copy of some part of PGF/Tikz.
+%%% It has been copied here to provide :
+%%% - compatibility with older PGF versions
+%%% - availability of PGF contributions by Christian Feuersaenger
+%%% which are necessary or helpful for pgfplots.
+%%%
+%%% For reasons of simplicity, I have copied the whole file, including own contributions AND
+%%% PGF parts. The copyrights are as they appear in PGF.
+%%%
+%%% Note that pgfplots has compatible licenses.
+%%%
+%%% This copy has been modified in the following ways:
+%%% - nested \input commands have been updated
+%%%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%%% Date of this copy: Fr 17. Aug 20:12:53 CEST 2012 %%%
+
+
+
+% Copyright 2006 by Till Tantau
+%
+% This file may be distributed and/or modified
+%
+% 1. under the LaTeX Project Public License and/or
+% 2. under the GNU Public License.
+%
+% See the file doc/generic/pgf/licenses/LICENSE for more details.
+
+\ProvidesFileRCS $Header: /cvsroot/pgf/pgf/generic/pgf/basiclayer/pgfcorelayers.code.tex,v 1.4 2011/10/02 17:36:05 ludewich Exp $
+
+
+% Creates a new pgf layer
+%
+% #1 = layer name
+%
+% Declares a new layer for pgf.
+%
+% Example:
+%
+% \pgfdeclarelayer{background}
+
+\def\pgfdeclarelayer#1{%
+ \pgfutil@ifundefined{pgf@layerbox@#1}{%
+ \expandafter\pgf@newbox\csname pgf@layerbox@#1\endcsname%
+ \expandafter\pgf@newbox\csname pgf@layerboxsaved@#1\endcsname%
+ }{}%
+}
+\let\pgf@newbox=\newbox % avoid plain TeX outer problem
+
+% Sets the layers that compose the picture
+%
+% #1 = List of layers
+%
+% Description:
+%
+% Sets the list of layers that make up the picture. The layers will be
+% put on top of each other in the order given.
+%
+% This command can also be given inside of a picture in which case it
+% applies only to that very picture.
+%
+% Example:
+%
+% \pgfsetlayers{background,main}
+
+\def\pgfsetlayers#1{\edef\pgf@layerlist{#1}}
+\pgfsetlayers{main}
+
+% Adds code to a layer
+%
+% #1 = layer name
+%
+% Note:
+%
+% You cannot add anything to the ``main'' layer using this command.
+%
+% Example:
+%
+% \begin{pgfonlayer}{background}
+% \fill[red] (0,0) -- (1,1);
+% \end{pgfonlayer}
+
+\def\pgfonlayer@name{main}
+
+\def\pgfonlayer#1{%
+ \pgfutil@ifundefined{pgf@layerbox@#1}{%
+ \PackageError{pgf}{Sorry, the requested layer '#1' could not be found. Maybe you misspelled it?}{}%
+ \bgroup
+ \begingroup
+ }{%
+ \begingroup
+ \edef\pgf@temp{#1}%
+ \ifx\pgf@temp\pgfonlayer@name
+ % we are already on this layer.
+ \def\pgf@temp{%
+ \bgroup
+ \begingroup
+ }%
+ \else
+ \let\pgfonlayer@name=\pgf@temp
+ \pgfonlayer@assert@is@active
+ \def\pgf@temp{%
+ \expandafter\global\expandafter%
+ \setbox\csname pgf@layerbox@#1\endcsname=\hbox to 0pt%
+ \bgroup%
+ \expandafter\box\csname pgf@layerbox@#1\endcsname%
+ \begingroup%
+ }%
+ \fi
+ \pgf@temp
+ }%
+}
+\def\endpgfonlayer{%
+ \endgroup%
+ \hss
+ \egroup%
+ \endgroup
+}
+
+\let\startpgfonlayer=\pgfonlayer
+\let\stoppgfonlayer=\endpgfonlayer
+
+\def\pgfdiscardlayername{discard}
+
+\def\pgfonlayer@assert@is@active{%
+ \ifx\pgfonlayer@name\pgfdiscardlayername
+ % this special layer name can be used as /dev/null without
+ % warning.
+ \else
+ \begingroup
+ \def\pgfonlayer@isactive{0}%
+ \expandafter\pgf@assert@layer@is@active@loop\pgf@layerlist,,\relax%
+ \if0\pgfonlayer@isactive
+ \pgfonlayer@assert@fail
+ \fi
+ \endgroup
+ \fi
+}%
+\def\pgfonlayer@assert@fail{%
+ \PackageError{pgf}{Sorry, the requested layer '\pgfonlayer@name' is not
+ part of the layer list. Please verify that you provided
+ \string\pgfsetlayers\space and that '\pgfonlayer@name' is part of this list}{}%
+}%
+\def\pgf@assert@layer@is@active@loop#1,#2,\relax{%
+ \edef\pgf@test{#1}%
+ \ifx\pgf@test\pgfonlayer@name
+ \def\pgfonlayer@isactive{1}%
+ \else
+ \def\pgf@test{#2}%
+ \ifx\pgf@test\pgfutil@empty%
+ \else%
+ \pgf@assert@layer@is@active@loop#2,\relax%
+ \fi%
+ \fi
+}
+
+% Hooks into the scoping:
+
+\def\pgf@insertlayers{%
+ \expandafter\pgf@dolayer\pgf@layerlist,,\relax%
+}
+\def\pgf@maintext{main}%
+\def\pgf@dolayer#1,#2,\relax{%
+ \def\pgf@test{#1}%
+ \ifx\pgf@test\pgf@maintext%
+ \box\pgf@layerbox@main%
+ \else%
+ \pgfsys@beginscope%
+ \expandafter\box\csname pgf@layerbox@#1\endcsname%
+ \pgfsys@endscope%
+ \fi%
+ \def\pgf@test{#2}%
+ \ifx\pgf@test\pgfutil@empty%
+ \else%
+ \pgf@dolayer#2,\relax%
+ \fi%
+}
+
+\def\pgf@savelayers{%
+ \expandafter\pgf@dosavelayer\pgf@layerlist,,\relax%
+}
+\def\pgf@dosavelayer#1,#2,\relax{%
+ \def\pgf@test{#1}%
+ \ifx\pgf@test\pgf@maintext%
+ \else%
+ \setbox\csname pgf@layerboxsaved@#1\endcsname=\box\csname pgf@layerbox@#1\endcsname%
+ \fi%
+ \def\pgf@test{#2}%
+ \ifx\pgf@test\pgfutil@empty%
+ \else%
+ \pgf@dosavelayer#2,\relax%
+ \fi%
+}
+
+\def\pgf@restorelayers{%
+ \expandafter\pgf@dorestorelayer\pgf@layerlist,,\relax%
+}
+\def\pgf@dorestorelayer#1,#2,\relax{%
+ \def\pgf@test{#1}%
+ \ifx\pgf@test\pgf@maintext%
+ \else%
+ \global\setbox\csname pgf@layerbox@#1\endcsname=\box\csname pgf@layerboxsaved@#1\endcsname%
+ \fi%
+ \def\pgf@test{#2}%
+ \ifx\pgf@test\pgfutil@empty%
+ \else%
+ \pgf@dorestorelayer#2,\relax%
+ \fi%
+}
+
+\endinput