%% For a wider writing width.
\newcommand\Wider[2][3em]{%
\makebox[\linewidth][c]{%
  \begin{minipage}{\dimexpr\textwidth+#1\relax}
  \raggedright#2
  \end{minipage}%
  }%
}

%% TiKZ
\usepackage{tikz}
\usetikzlibrary{graphs}
\usetikzlibrary{positioning}
\tikzset{ bbox/.style={
  rectangle,
  minimum width=2.5cm,
  rounded corners=2mm,
  very thick,draw=blue!50,
  top color=white,
  bottom color=blue!20 } }

\tikzset{ rbox/.style={
    rectangle,
    dotted,
    minimum width=2.5cm,
    rounded corners=2mm,
    very thick,draw=red!50!black!50,
    top color=white,
    bottom color=red!50!black!20 } }

\tikzset{ gbox/.style={
    rectangle,
    minimum width=2.5cm,
    very thick,
    draw=green!50!black!50,
    top color=white,
    bottom color=green!50!black!20 } }

%% For the make demo
\newcommand{\makedemoslide}[2] {
  \begin{frame}{#2}
    \begin{center}\includegraphics[width=0.8\linewidth]{#1}\end{center}\par
    \vspace{-8mm} \footnotesize \textcolor{green!50!black}{Green
      boxes} with sharp corners: \emph{source} files (hand
    written).\\\textcolor{blue}{Blue boxes} with rounded corners:
    \emph{built} files (automatically
    generated),\par \hspace{1cm}built files are shown in the Makefile
    that contains their build instructions.
  \end{frame}
}

%% Nodes in make-demo graph
\tikzset{node-terminal/.style={
  rectangle,
  very thick,
  draw=blue!50,
  text centered,
  top color=white,
  minimum size=6mm,
  text width=2.1cm,
  rounded corners=3mm,
  bottom color=blue!20,
  font=\ttfamily}}

\tikzset{node-nonterminal/.style={
  rectangle,
  very thick,
  text centered,
  top color=white,
  text width=2.1cm,
  minimum size=6mm,
  draw=green!50!black!50,
  bottom color=green!80!black!50,
  font=\ttfamily}}

\tikzset{node-makefile/.style={
  thick,
  rectangle,
  anchor=south,
  minimum width=2.6cm,
  minimum height=5cm,
  draw=green!50!black!50,
  rounded corners=2mm,
  fill=black!10!green!12!white,
}}

\tikzset{node-point/.style={
  circle,
  black!50,
  inner sep=0pt,
  minimum size=0pt,
  fill=white}}