[Tex/LaTex] Tikz, scope scaled, and shared node

scalingtikz-pgf

In order to include a small sub-figure in my main figure, I tried to use scaled scope. However, when I try to refer to a node out of the scaled scope, the node pointed is at the position of the old non-scaled node… Here is a picture :

enter image description here

Do you know how to avoid that ?

Thank you !

PS : Here is my WME.

\documentclass{report}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage[francais]{babel}     
\usepackage{float}
\usepackage{tikz}
\usetikzlibrary{shapes.geometric,arrows}
\usetikzlibrary{mindmap,backgrounds,positioning}
\usetikzlibrary{automata,positioning,fit,backgrounds}
\usetikzlibrary{positioning,arrows,matrix,calc}

\begin{document}

\begin{figure}[H]
  \centering
  \begin{tikzpicture}
    \begin{scope}[transform canvas={scale=1},overlay]
      \node[fill=green]   (a) {A};
      \node[fill=green,right=of a] (b) {B};
    \end{scope}
    \node[draw,below=5mm of b] (c) {C};
    \draw[<->] (c) -- (b);
  \end{tikzpicture}%
  \hspace{3cm}%
  \begin{tikzpicture}
    \begin{scope}[transform canvas={scale=0.2},overlay]
      \node[fill=green]   (a) {A};
      \node[fill=green,right=of a] (b) {B};
    \end{scope}
    \node[draw,below=5mm of b] (c) {C};
    \draw[<->] (c) -- (b);
  \end{tikzpicture}%
\end{figure}

\end{document}

Best Answer

Perhaps you want this?

scaled and unscaled

\documentclass{report}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage[francais]{babel}
\usepackage{tikz}
\usetikzlibrary{positioning,babel}

\begin{document}

\begin{figure}
  \centering
  \begin{tikzpicture}
    \node[fill=green]   (a) {A};
    \node[fill=green,right=of a] (b) {B};
    \node[draw,below=5mm of b] (c) {C};
    \draw[<->] (c) -- (b);
  \end{tikzpicture}
  \hspace{3cm}
  \begin{tikzpicture}
    \begin{scope}[scale=0.2, every node/.append style={transform shape}]
      \node [fill=green]   (a) {A};
      \node [fill=green,right=of a] (b) {B};
    \end{scope}
    \node [draw,below=5mm of b] (c) {C};
    \draw [<->] (c) -- (b);
  \end{tikzpicture}
\end{figure}

\end{document}
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