Connecting nodes in every page

Question

I would like to create a document where section titles are tikz nodes, and i would like to connect the nodes in every page with a path starting from the top righth corner of the page in every page. Is this possible?

Edit from Gonzalo (adding information provided by str. in a comment to my first answer):

What I initially wanted is a line that connects the upper right corner of the page with the right of the first section, and then the left of the first section to the left of the second, etc. so it would be something like corner-|section 1 -|-section 2 (etc), sort of like a snake. I can do it in tikz manually, but i would like to do it automatically in every page.

Answer 1

If I understand the question correctly, you can use TikZ together with the titlesec package to do the job; something along these lines:

\documentclass{article}
\usepackage{titlesec}
\usepackage{tikz}
\usepackage{lipsum}

\titleformat{\section}
  {\normalfont\Large\bfseries}
  {\tikz[remember picture,overlay,baseline=-6pt]
    \node[fill=cyan!60!black,minimum width=1.5em,align=center] (a) {\thesection};}
  {1em}
  {\tikz[remember picture,overlay]
    {\draw[cyan!60!black,ultra thick] 
      (a.west) -- +(-10pt,0pt)  |- ([xshift=-20pt,yshift=-20pt]current page.north east);
    \node[fill=cyan!60!black,minimum width=1em,minimum height=1em] 
      at ([xshift=-20pt,yshift=-20pt]current page.north east) {};
    }%  
  }

\begin{document}

\section{Test Section One}
\lipsum[1-4]
\section{Test Section Two}
\lipsum[1-4]
\section{Test Section Three}
\lipsum[4]

\end{document}

In a comment, str. has explained the design he/she wants to achieve; the idea is to get a snake pattern, formed with straight horizontal and vertical rules, zig-zagging through the sections of the document. This requires considerably more job, but is still possible; the code needs three or four runs to stabilize and some work has still to be done for the case of a page break near a section start:

\documentclass{article}
\usepackage{tikzpagenodes}
\usepackage{titlesec}
\usepackage{refcount}
\usepackage{xifthen}
\usepackage{atbegshi}
\usepackage{etoolbox}
\usepackage{lipsum}

\newcommand\pos{}
\newcounter{seccount}
\newcounter{linepages}
\newlength\linesep
\newlength\linesepaux
\newlength\mylinewidth

\setlength\linesep{40pt}
\colorlet{mycolor}{cyan!60!black}
\setlength\mylinewidth{6pt}

\setlength\linesepaux{\linesep}
\newcommand\tikzmark[1]{%
  \tikz[remember picture,overlay] \coordinate (#1) {};}

\titleformat{\section}
  {\normalfont\Large\bfseries}
  {\thesection}
  {1em}
  {\begin{tikzpicture}[remember picture,overlay]
    \draw[line width=\mylinewidth,mycolor] ([xshift=\the\dimexpr\linesepaux+0.5\mylinewidth\relax]current page text area.east|-s-\the\numexpr\thesection-1\relax) -- 
([xshift=\the\dimexpr-\linesepaux-0.5\mylinewidth\relax]current page text area.west|-s-\the\numexpr\thesection-1\relax);
\end{tikzpicture}%
  }

\newcommand\StartSecLine{%
  \stepcounter{seccount}
  \ifthenelse{\isodd{\theseccount}}
    {\global\renewcommand\pos{current page text area.north west}%
      \global\setlength\linesep{\linesepaux}}
    {\global\renewcommand\pos{current page text area.north east}%
      \global\setlength\linesep{-\linesepaux}}
  \tikzmark{e-\theseccount}\label{e-\theseccount}%
  \ifnum
    \getpagerefnumber{e-\theseccount}=\getpagerefnumber{s-\theseccount}\relax
  \else
    \begin{tikzpicture}[overlay, remember picture]
      \draw [line width=\mylinewidth,mycolor]
        ([xshift=-\linesep]\pos|-e-\theseccount) -- ([xshift=-\linesep]\pos|-current page text area.south);
    \end{tikzpicture}
    \setcounter{linepages}{\numexpr\getpagerefnumber{s-\theseccount}-\getpagerefnumber{e-\theseccount}}
    \ifnum\value{linepages}>1
      \AtBeginShipoutNext{\tikzlinepage}%
    \fi%
  \fi%
}

\newcommand\EndSecLine{%
\tikzmark{s-\theseccount}\label{s-\theseccount}
\ifnum
  \getpagerefnumber{s-\theseccount}=\getpagerefnumber{e-\theseccount}\relax
  \begin{tikzpicture}[overlay, remember picture]
    \draw [line width=\mylinewidth,mycolor]
      ([xshift=-\linesep]\pos|-e-\theseccount) -- ([xshift=-\linesep]\pos|-s-\theseccount);
  \end{tikzpicture}%
\else
  \begin{tikzpicture}[overlay, remember picture]
    \draw [line width=\mylinewidth,mycolor]
      ([xshift=-\linesep]\pos) -- ([xshift=-\linesep]\pos|-s-\theseccount);
  \end{tikzpicture}%
\fi
}

\newcommand\Initrules{%
\begin{tikzpicture}[remember picture,overlay]
  \draw[line width=\mylinewidth,mycolor]
    ([xshift=\the\dimexpr\linesep\relax]current page text area.east|-e-1) --
    ([xshift=\linesep,yshift=-20pt]current page text area.east|-current page.north);
  \draw[line width=\mylinewidth,mycolor] 
    ([xshift=\the\dimexpr\linesep+0.5\mylinewidth\relax]current page text area.east|-e-1) --
    ([xshift=\the\dimexpr-\linesep-0.5\mylinewidth\relax]current page text area.west|-e-1);
\end{tikzpicture}%
}

\newcommand\tikzlinepage{%
\begin{tikzpicture}[overlay, remember picture]
  \draw [line width=\mylinewidth,mycolor]
    ([xshift=-\linesep]\pos) --
    ([xshift=-\linesep]\pos|-current page text area.south west);
\end{tikzpicture}
\addtocounter{linepages}{-1}%
\ifnum\value{linepages}>1
  \AtBeginShipoutNext{\tikzlinepage}%
\fi%
}

\AtBeginDocument{%
\noindent\tikzmark{s-0}
\StartSecLine
\Initrules}

\AtEndDocument{%
\EndSecLine}

\newcommand\StartMarks{\pretocmd{\section}{\EndSecLine\StartSecLine}{}{}}

\begin{document}

\section{Test Section One}
\lipsum[1-2]

\StartMarks

\section{Test Section Two}
\lipsum[1-8]
\section{Test Section Three}
\lipsum[4]
\section{Test Section Four}
\lipsum[1]
\section{Test Section Five}
\lipsum[4-5]
\section{Test Section Six}
\lipsum[4-6]

\end{document}

Changing the values for mycolor, \mylinewidth and \linesep, the color, width and separation between the rule and the text can be easily customized.