tikzlibrarypaths.rectangle.code.tex

% This is the TikZ library paths.rectangle
% Load with \usetikzlibrary{paths.rectangle}
%
% This small library extends the node placing algorithm (a.k.a. timer)
% so that nodes can be placed on the path of an rectangle.
%
% Styles are:
%  - rectangle original timer
%    The original placement between position 0 and 1 are not changed.
%    The rectangle's path can be accessed by positions between 1 and 2.
%  - rectangle new timer
%    This style switches the positions between 0 and 1 with those
%    between 1 and 2.

\def\qrr@tikz@timer@rect@origline{%
  \ifdim\tikz@time pt>1pt
    \pgfutil@tempdima\tikz@time pt
    \ifdim\pgfutil@tempdima<1.5pt
      \advance\pgfutil@tempdima-1pt
    \else
      \advance\pgfutil@tempdima-1.5pt
      \let\pgf@tempa\tikz@timer@start
      \let\tikz@timer@start\tikz@timer@end
      \let\tikz@timer@end\pgf@tempa
    \fi
    \multiply\pgfutil@tempdima2
    \edef\tikz@time{\strip@pt\pgfutil@tempdima}%
    \expandafter\tikz@timer@vhline
  \else\expandafter\tikz@timer@line\fi
}
\def\qrr@tikz@timer@rect@lineafterone{%
  \pgfutil@tempdima\tikz@time pt
  \ifdim\pgfutil@tempdima<1pt
    \ifdim\pgfutil@tempdima<.5pt\else
      \advance\pgfutil@tempdima-.5pt
      \let\pgf@tempa\tikz@timer@start
      \let\tikz@timer@start\tikz@timer@end
      \let\tikz@timer@end\pgf@tempa
    \fi
    \multiply\pgfutil@tempdima2
    \edef\tikz@time{\strip@pt\pgfutil@tempdima}%
    \expandafter\tikz@timer@vhline
  \else
    \advance\pgfutil@tempdima-1pt
    \edef\tikz@time{\strip@pt\pgfutil@tempdima}%
    \expandafter\tikz@timer@line
  \fi
}
\tikzset{
  rectangle original timer/.code=\let\tikz@timer@line\qrr@tikz@timer@rect@origline,
  rectangle new timer/.code=\let\tikz@timer@line\qrr@tikz@timer@rect@lineafterone,
  rectangle original timer
}