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% Copyright 2018 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}%
% Define the basic decoration stuff for tikz. Load more libraries to
% "actually use" decorations
\tikzset{decorate/.is if=tikz@decoratepath,
/pgf/decoration/name/.store in=\tikz@decoration@name,
/pgf/decoration/.unknown/.code=%
\pgfifdecoration{\pgfkeyscurrentname}{\edef\tikz@decoration@name{\pgfkeyscurrentname}}
{\pgfifmetadecoration{\pgfkeyscurrentname}{\edef\tikz@decoration@name{\pgfkeyscurrentname}}
{\pgfkeys{/errors/unknown
key={/pgf/decoration/\pgfkeyscurrentname}{#1}}}},%
/pgf/decoration/raise/.code={\def\tikz@dec@shift{\pgftransformyshift{#1}}\tikz@dec@trans},
/pgf/decoration/mirror/.code={%
\csname if#1\endcsname
\def\tikz@dec@mirror{\pgftransformyscale{-1}}%
\else%
\let\tikz@dec@mirror=\relax%
\fi%
\tikz@dec@trans%
},
/pgf/decoration/mirror/.default=true,
/pgf/decoration/transform/.code={%
{%
\pgftransformreset%
\def\tikz@transform{}%
\pgfkeysalso{/tikz/.cd, #1}%
\expandafter\gdef\expandafter\tikz@g@temptransform\expandafter{\tikz@transform}%
}%
\let\tikz@dec@user@transform=\tikz@g@temptransform%
\tikz@dec@trans%
},%
/pgf/decoration/pre/.initial=lineto,
/pgf/decoration/post/.initial=lineto,
/pgf/decoration/pre length/.initial=0pt,
/pgf/decoration/post length/.initial=0pt,
}%
\let\tikz@decoration@name=\tikz@nonetext
\def\tikz@dec@trans{\pgfsetdecorationsegmenttransformation{\tikz@dec@user@transform\tikz@dec@mirror\tikz@dec@shift}}%
\let\tikz@dec@user@transform=\relax
\let\tikz@dec@shift=\relax
\let\tikz@dec@mirror=\relax
\pgfdeclaremetadecoration{tikz@internal}{pre}{%
\state{pre}[width=\pgfkeysvalueof{/pgf/decoration/pre length}, next state=main]
{
\tikz@dec@trans
\decoration{\pgfkeysvalueof{/pgf/decoration/pre}}
}%
\state{main}[width=\pgfmetadecoratedremainingdistance-\pgfkeysvalueof{/pgf/decoration/post length}, next state=final]
{
\tikz@dec@trans
\decoration{\tikz@decoration@name}
}%
\state{final}
{
\tikz@dec@trans
\decoration{\pgfkeysvalueof{/pgf/decoration/post}}
}%
}%
\newif\iftikz@metadecoration
\def\tikz@lib@dec@addtomacro#1#2{\expandafter\def\expandafter#1\expandafter{#1#2}}%
\def\tikz@lib@decoration[#1]{%
\begingroup%
% Just to be on the save side...
%
% Now, let's parse the options:
\tikzset{#1}%
%
\ifx\tikz@decoration@name\tikz@nonetext%
% Ok, let's forget about this decoration stuff...
\else
\expandafter\tikz@lib@do@dec%
\fi%
% Now, we expect a brace.
\pgfutil@ifnextchar\bgroup{%
\begingroup%
\tikz@auto@end@pathfalse%
\aftergroup\tikz@enddecoration%
\afterassignment\tikz@scan@next@command%
\let\tikz@lib@next% gobble \bgroup%
}%
{%
\tikzerror{A decoration must begin with a brace}%
\tikz@enddecoration%
}%
}%
\def\tikz@lib@do@dec{%
% Ok, now what?
\pgfifmetadecoration{\tikz@decoration@name}%
{\expandafter\pgfmetadecoration\expandafter{\tikz@decoration@name}}%
{%
\pgfifdecoration{\tikz@decoration@name}%
{\tikz@lib@dec@startdecoration}%
{\tikzerror{Unknown (meta-)decoration '\tikz@decoration@name'. Perhaps you
misspelled it?}}%
}%
\ifx\pgfdecorateexistingpath\pgfutil@empty%
\pgfpathmoveto{\pgfqpoint{\the\tikz@lastxsaved}{\the\tikz@lastysaved}}%
\fi%
}%
\newbox\tikz@lib@dec@box
\def\tikz@enddecoration{%
\global\setbox\tikz@lib@dec@box=\box\tikz@tempbox%
\ifx\tikz@decoration@name\tikz@nonetext%
% ignore this.
\else
% Ok, now what?
\iftikz@metadecoration%
\endpgfmetadecoration%
\else%
\tikz@lib@dec@stopdecoration%
\fi%
\fi
\endgroup%
\setbox\tikz@tempbox=\box\tikz@lib@dec@box%
}%
\def\tikz@lib@dec@decorate@path{%
\ifx\tikz@decoration@name\tikz@nonetext%
\else%
\pgfgetpath\tikz@lib@dec@currentpath%
\pgfsetpath\pgfutil@empty%
\pgfifmetadecoration{\tikz@decoration@name}
{
\expandafter\pgfmetadecoration\expandafter{\tikz@decoration@name}%
\pgfsetpath\tikz@lib@dec@currentpath%
\endpgfmetadecoration%
}
{
\pgfifdecoration{\tikz@decoration@name}
{
\tikz@lib@dec@startdecoration%
\pgfsetpath\tikz@lib@dec@currentpath%
\tikz@lib@dec@stopdecoration%
}
{
\tikzerror{Unknown (meta-)decoration '\tikz@decoration@name'. Perhaps
you misspelled it?}
}
}
\fi%
}%
\def\tikz@lib@dec@zpttext{0pt}%
\newif\iftikz@lib@dec@temp
\def\tikz@lib@dec@startdecoration{%
\pgfkeysgetvalue{/pgf/decoration/pre length}{\tikz@lib@pre}%
\pgfkeysgetvalue{/pgf/decoration/post length}{\tikz@lib@post}%
\tikz@lib@dec@tempfalse%
\ifx\tikz@lib@pre\tikz@lib@dec@zpttext%
\ifx\tikz@lib@post\tikz@lib@dec@zpttext%
\else%
\tikz@lib@dec@temptrue%
\fi%
\else%
\tikz@lib@dec@temptrue%
\fi%
\iftikz@lib@dec@temp%
\pgfmetadecoration{tikz@internal}%
\else%
\expandafter\pgfdecoration\expandafter{\expandafter{\tikz@decoration@name}{\pgfdecoratedpathlength}{}{}}%
\fi%
}%
\def\tikz@lib@dec@stopdecoration{%
\iftikz@lib@dec@temp%
\endpgfmetadecoration%
\else%
\endpgfdecoration%
\fi%
}%
\endinput
|
