I have this beautiful tikz diagram of my program that I have created :
The different colours correspond to different programs, so I would like to know if there is a way to add a frame around each group of nodes of the same colour (which here would only change for the free in light cyan). Like in this other picture
And here is what I get after a look at This
It looks good from the cyan one, but I do not know how to get the desired width as the frames are defined to fit the nodes...
Here is my code :
\documentclass[a4paper]{article}
\usepackage[english]{babel}
\usepackage[utf8]{inputenc}
\usepackage{tikz-cd}
\usetikzlibrary{shapes,arrows}
\usetikzlibrary{calc,trees,positioning,arrows,chains,shapes.geometric,shapes}
\begin{document}
\begin{landscape}
\tikzstyle{block2} = [rectangle, draw, fill=blue!20, text width=7cm, text centered, rounded corners, minimum height=4em]
\tikzstyle{block} = [rectangle, draw, fill=white, text width=7cm, text centered, rounded corners, minimum height=4em]
\tikzstyle{arrow} = [draw, -latex']
\tikzstyle{line} = [draw]
\tikzstyle{block4} = [rectangle, draw, fill=cyan!10, text width=6.5cm, text centered, rounded corners, minimum height=4em]
\tikzstyle{through} = [rectangle, fill=white, text width=6.5cm, text centered, rounded corners, minimum height=2em]
\tikzstyle{block5} = [rectangle, draw, fill=yellow!8, text width=8cm, text centered, rounded corners, minimum height=4em]
\tikzstyle{block6} = [rectangle, draw, fill=green!12, text width=6.5cm, text centered, rounded corners, minimum height=4em]
\tikzstyle{block7} = [rectangle, draw, fill=blue!14, text width=12cm, text centered, rounded corners, minimum height=4em]
\tikzstyle{block8} = [rectangle, draw, fill=red!16, text width=12cm, text centered, rounded corners, minimum height=4em]
\tikzstyle{frame_cyan} = [thick, draw=cyan, dotted,inner sep=0.2em]
\tikzstyle{frame_yellow} = [thick, draw=yellow, dotted,inner sep=0.2em]
\tikzstyle{frame_blue} = [thick, draw=blue, dotted,inner sep=0.2em, text width=12cm]
\tikzstyle{frame_red} = [thick, draw=red, dotted,inner sep=0.2em]
\tikzstyle{frame_green} = [thick, draw=green, dotted,inner sep=0.2em]
\begin{tikzpicture}[node distance = 2cm, auto]
\centering
% Place nodes
\node [block4] (Foyer)
{\emph{foyer.foyer \textbf{FOYER EEC}} \\
\begin{itemize}
\item on crée sous-table par département
\item suppression doublons
\end{itemize}
};
\node [block4, right of=Foyer, node distance=8cm] (Pote)
{\emph{pote.dep \textbf{FOYER POTE}} \\
\begin{itemize}
\item choix anrev correct
\item doublons dirindic
\end{itemize}
};
\path (Foyer) -- (Pote) node[through, pos=.5,below=1cm] (Merge1)
{\textbf{Fusion par dirindik}
};
\node [block5, right of=Merge1, node distance=14cm] (Indrev)
{\emph{foyer.indrev \textbf{INDIVIDU EEC}}
\\ \begin{itemize}
\item détermine, via MDS, âge, persfipd
\begin{itemize}
\item $Persfip_{N-1}$
\item $Prevu$ créé à partir de $dirindik_{N-1}$
\begin{itemize}
\item Oui
\item Non
\end{itemize}
\end{itemize}
\end{itemize}};
\node [block4, below of=Merge1, node distance=1.5cm] (FoyerPote)
{\emph{Travail.Pote\_DEP\_Clean \textbf{FOYER}} \\
\begin{itemize}
\item on empile chaque département
\end{itemize}
\emph{table Travail.FoyerPoteFR}
};
\node [block6, below of=FoyerPote, node distance=2.2cm] (IRFoyer)
{\emph{Travail.Pote\_nat \textbf{FOYER}} \\
\begin{itemize}
\item On récupère les variables idoines
\begin{itemize}
\item les MDS année précédente
\item l'impôt
\item les var pour REVDISP(N)
\end{itemize}
\end{itemize}
};
\path (Merge1) -- (Indrev) node[through, pos=.6,below=5cm] (Merge2)
{\textbf{Fusion par dirindik}
};
\node [block7, below of=Merge2, node distance=2.5cm] (IndivPote)
{\emph{Travail.IndivPote \textbf{INDIVIDU EEC}} \\
\begin{itemize}
\item On vérifie qui on a trouvé
\begin{itemize}
\item Si individu EEC trouvé dans Pote\_nat : $Trouve=Oui$
\item Sinon : $Trouve = Non$
\item Femmes en MDS en N-1 : manque une déclaration : $Trouve=Partiel$
\end{itemize}
\item On compare $Prevu$ et $Trouve$
\end{itemize}
};
\node [block8, below of=IndivPote, node distance=3.75cm] (Menage)
{\emph{Travail.IndivPote \textbf{INDIVIDU EEC}} \\
\begin{itemize}
\item Par nomen, on compte le nombre d'adultes\\
si trouvé=Partiel (resp.Oui), on incrémente nbpartiel (resp. nbcomplet)\\
\begin{itemize}
\item Si nbadulte=nbcomplet : TROUVE
\item Si nbadulte\textgreater nbcomplet : PARTIEL
\item Si nbpartiel+nbcomplet=0
\end{itemize}
\end{itemize}
\emph{Travail.MenagePote \textbf{MENAGE EEC}}
};
\node[frame_cyan,fit=(Foyer) (Pote) (FoyerPote)]{};
\node[frame_yellow,fit=(Indrev)]{};
\node[frame_green,fit=(IRFoyer)]{};
\node[frame_blue,fit=(IndivPote)]{};
\node[frame_red,fit=(Menage)]{};
% Draw edges
\path [arrow] (Foyer) -| (FoyerPote);
\path [arrow] (Pote) -| (FoyerPote);
\path [arrow] (FoyerPote) -- (IRFoyer);
\path [arrow] (IRFoyer) -| (IndivPote);
\path [line] (Indrev) |- (Indrev|-IRFoyer);
\path [line] (Indrev|-IRFoyer) -| (IndivPote);
\path [arrow] (IndivPote) -- (Menage);
\end{tikzpicture}
\end{landscape}
\end{document}
calclibrary to place fitting corners where you need it and draw a rectangle or a fitting node, like in Thorsten's answer in linked question.