Current File : //proc/self/root/usr/share/texlive/texmf-dist/tex/generic/pgf/basiclayer/pgfcorelayers.code.tex
% 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 1.2 2010/08/27 12:51:47 ludewich Exp $
% Creates a new pgf layer
%
% #1 = layer name
%
% Declares a new layer for pgf.
%
% Example:
%
% \pgfdeclarelayer{background}
\def\pgfdeclarelayer#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.
%
% 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#1{%
\pgfutil@ifundefined{pgf@layerbox@#1}{%
\PackageError{pgf}{Sorry, the requested layer '#1' could not be found. Maybe you misspelled it?}{}%
\bgroup
\begingroup
}{%
\expandafter\global\expandafter%
\setbox\csname pgf@layerbox@#1\endcsname=\hbox to 0pt%
\bgroup%
\expandafter\box\csname pgf@layerbox@#1\endcsname%
\begingroup%
}%
}
\def\endpgfonlayer{%
\endgroup%
\hss
\egroup%
}
\let\startpgfonlayer=\pgfonlayer
\let\stoppgfonlayer=\endpgfonlayer
% 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
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