% ROUNDDIAG STYLE 
%    for LaTeX version 2e
% by -- 2008 Martin Hutle <martin.hutle@epfl.ch>
%
% This style file is free software; you can redistribute it and/or
% modify it under the terms of the GNU Lesser General Public
% License as published by the Free Software Foundation; either
% version 2 of the License, or (at your option) any later version.
%
% This style file is distributed in the hope that it will be useful,
% but WITHOUT ANY WARRANTY; without even the implied warranty of
% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
% Lesser General Public License for more details.
%
% You should have received a copy of the GNU Lesser General Public
% License along with this style file; if not, write to the
% Free Software Foundation, Inc., 59 Temple Place - Suite 330,
% Boston, MA  02111-1307, USA.
%
\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{rounddiag}
\typeout{Document Style `rounddiag' - provides simple round diagrams}
%
\RequirePackage{ifthen}
\RequirePackage{calc}
\RequirePackage{tikz}

\def\rdstretch{3}

\tikzstyle{msg}=[->,thick,>=latex]
\tikzstyle{rndline}=[dotted]
\tikzstyle{procline}=[dotted]

\newenvironment{rounddiag}[2]{
\begin{center}
\begin{tikzpicture}
\foreach \i in {1,...,#1}
  \draw[procline] (0,#1-\i) node[xshift=-1em]{$p_{\i}$} -- (#2*\rdstretch+1,#1-\i);
\foreach \i in {0,...,#2}
  \draw[rndline] (\i*\rdstretch+0.5,0) -- (\i*\rdstretch+0.5,#1-1);
\newcommand{\rdat}[2]{
  (##2*\rdstretch+0.5,#1-##1)
}%
\newcommand{\round}[2]{%
  \def\rdround{##1}
  \ifthenelse{\equal{##2}{}}{}{
    \node[yshift=-1em] at ({##1*\rdstretch+0.5-{0.5*\rdstretch}},0) {##2};
  }
}%
\newcommand{\rdmessage}[3]{\draw[msg]
  (\rdround*\rdstretch-\rdstretch+0.5,#1-##1)  -- node[yshift=1.2ex]{##3}
  (\rdround*\rdstretch+0.5,#1-##2);}%
\newcommand{\rdalltoall}{%
  \foreach \i in {1,...,#1}
    \foreach \j in {1,...,#1}
    {  \rdmessage{\i}{\j}{}}}%
}{%
\end{tikzpicture}
\end{center}
}