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% Copyright 2008 by Mark Wibrow
%
% 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.
\usepgfmodule{decorations}
% A marking decoration is used to add markings (which are just pgf
% scopes, essentially) at certain positions of a path.
\pgfkeys{
/pgf/decoration/reset marks/.code=\let\pgf@lib@dec@mark@marks=\pgfutil@empty,
/pgf/decoration/mark/.code=\pgf@lib@dec@parsemark#1\pgf@lib@dec@stop,
}
\let\pgf@lib@dec@mark@marks=\pgfutil@empty
\def\pgf@lib@dec@parsemark at position#1with#2\pgf@lib@dec@stop{%
\expandafter\def\expandafter\pgf@lib@dec@mark@marks\expandafter{\pgf@lib@dec@mark@marks%
\pgf@lib@dec@domark{#1}{#2}%
}%
}
\def\pgf@lib@dec@arrowhead#1#2{%
\expandafter\ifx\csname tikz@special@arrow@end#2\endcsname\relax% be nice to TikZ
\pgfsetarrowsend{#2}
\else%
\pgfsetarrowsend{\csname tikz@special@arrow@end#2\endcsname}%
\fi%
\pgf@x=0pt%
\pgf@shorten@end%
\pgftransformxshift{-\pgf@x}
\pgftransformxscale{#1}
\pgflowlevelsynccm%
\pgflowlevelobj{}{\pgf@endarrow}%
}
\def\pgf@lib@dec@doarrowhead#1{%
\pgf@lib@dec@arrowhead{1}{#1}%
}
\def\pgf@lib@dec@doarrowheadrev#1{%
\pgf@lib@dec@arrowhead{-1}{#1}%
}
\pgfdeclaredecoration{markings}{pre}
{
\state{pre}
[
width=0pt,
persistent precomputation={%
\pgf@lib@dec@mark@marks\pgf@lib@dec@mark@last%
\let\arrow=\pgf@lib@dec@doarrowhead%
\let\arrowreversed=\pgf@lib@dec@doarrowheadrev%
},
next state=skipper
]
{}
\state{skipper}[width=\pgf@lib@dec@computed@width-\pgfdecoratedcompleteddistance-1sp,
next state=\pgf@lib@dec@next@state]{}
\state{main}
[
width=1sp,
next state=pre
]
{%
\pgfinterruptpath%
\pgfscope%
\let\pgf@lib@dec@mark@marks=\pgfutil@empty%
\pgf@lib@dec@computed@action%
\endpgfscope%
\endpgfinterruptpath%
}%
\state{final}[width=\pgfdecoratedremainingdistance]{}
}
\def\pgf@lib@dec@domark#1#2#3\pgf@lib@dec@mark@last{%
\def\pgf@lib@dec@mark@marks{#3}%
\pgf@lib@dec@parsenum{#1}%
\def\pgf@lib@dec@computed@action{#2}%
\def\pgf@lib@dec@next@state{main}%
}
\def\pgf@lib@dec@parsenum#1{%
\pgfmathparse{#1}%
\ifpgfmathunitsdeclared%
\ifdim\pgfmathresult pt<0pt\relax%
\edef\pgf@lib@dec@computed@width{\pgfdecoratedpathlength\pgfmathresult pt}%
\else%
\edef\pgf@lib@dec@computed@width{\pgfmathresult pt}%
\fi%
\else%
\ifdim\pgfmathresult pt<0pt\relax%
\edef\pgf@lib@dec@computed@width{\pgfdecoratedpathlength\pgfmathresult*\pgfdecoratedpathlength}%
\else%
\edef\pgf@lib@dec@computed@width{\pgfmathresult*\pgfdecoratedpathlength}%
\fi%
\fi%
}
\def\pgf@lib@dec@mark@last{%
\def\pgf@lib@dec@next@state{final}%
}
\endinput
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