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% Copyright 2018 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{pgfcorelayers.code.tex}
% 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\expandafter\csname pgf@newbox\endcsname\csname pgf@layerbox@#1\endcsname%
\expandafter\expandafter\csname pgf@newbox\endcsname\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{%
\let\pgf@layerlist\pgfutil@empty%
\pgf@dosetlayer#1,,\relax%
}
\def\pgf@dosetlayer#1,#2,\relax{%
\ifx\pgf@layerlist\pgfutil@empty%
\edef\pgf@layerlist{\pgfutil@trimspaces{#1}}%
\else
\edef\pgf@layerlist{\pgf@layerlist,\pgfutil@trimspaces{#1}}%
\fi
\def\pgf@test{#2}%
\ifx\pgf@test\pgfutil@empty%
\else%
\pgf@dosetlayer#2,\relax%
\fi%
}
\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}{%
\pgferror{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
\pgfsetlinewidth{0.4pt}% always reset the line width
\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{%
\pgferror{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
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