TikZ，调整大小和拟合

Question

我想拍摄一张PGF图片，缩小它（缩放文本，使\resizebox完美）以获得一定的高度，然后在图片的左侧放置一个旋转的文字并创建包含所有内容的节点。

这样的事情：

但我希望能够设置图表的高度而不缩小旋转的“标题”。

以下是此示例的LaTeX代码：

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{positioning,fit,shapes.geometric,backgrounds}

\begin{document}
\begin{tikzpicture}[%
  inner sep=2mm,
    delimiter/.style={ellipse, very thick, fill=red!30, draw=red!50},
    action/.style={trapezium, trapezium left angle=120, trapezium right angle=60, thick, fill=blue!30, draw=blue!50, align=center},
    loop/.style={ellipse, thick, fill=yellow!30, draw=yellow!50, align=center},
  title/.style={font=\LARGE\scshape,node distance=16pt, text=black!40, inner sep=1mm},
  background/.style={rectangle, rounded corners, fill=black!5, draw=black!15, inner sep=4mm}
]

  \node[delimiter] (begin) {Begin};
  \node[action] (cluster residues) [below=of begin] {Cluster residues};
  \node[action] (set clusters) [below=of cluster residues] {Set properties\\for every cluster};
  \node[action] (find pockets) [below=of set clusters] {Find clusters with\\$normalized\ SAS < 1$};
  \node[action] (sort pockets) [below=of find pockets] {Sort pockets found};
  \node[delimiter] (end) [below=of sort pockets] {End};

  \draw[->] (begin.south) -- (cluster residues);
  \draw[->] (cluster residues) -- (set clusters);
  \draw[->] (set clusters) -- (find pockets);
  \draw[->] (find pockets) -- (sort pockets);
  \draw[->] (sort pockets) -- (end);

  \node[fit=(begin)(cluster residues)(set clusters)(find pockets)(sort pockets)(end)] (chart) {};
  \node[title] (title) [left=of chart] {\rotatebox{90}{General algorithm}};

  \begin{scope}[on background layer]
    \node[background,fit=(chart)(title)] {};
  \end{scope}
\end{tikzpicture}
\end{document}

有关如何使用\resizebox，\adjustbox或其他任何内容调整仅图表（而不是“常规算法”标签）的任何想法？