简单思维导图组合树

Question

我想将简单的思维导图与树结合起来。

首先，我尝试从以下思维导图获取pgf 手册第 79 页：

感谢 @cfr，我可以让思维导图正常工作。使用来自 TikZ 和 PGF 文档的源代码。问题是我无法获得如此简单的版本，它总是带有像第 82 页那样的颜色。:(

现在唯一的问题是下面的一切应该像一棵树，如下图所示，取自示例并正在独立工作。我只是知道如何将这两个概念结合起来。

你能帮助我吗？

最小示例：

\documentclass{article}
\usepackage{tikz}

\begin{document}

    \begin{figure}
        \centering
        \usetikzlibrary{trees}  
        \begin{tikzpicture}[scale=0.9,text width=2.7cm, align=flush center,
        grow cyclic,
        level 1/.style={level distance=2.5cm,sibling angle=90},
        level 2/.style={text width=2cm, font=\footnotesize, level distance=3cm,sibling angle=30}]
        \node[font=\bfseries] {Computational Complexity} % root
        child { node {Computational Problems}
            child { node {Problem Measures} }           child { node {Problem Aspects} }
            child { node {Problem Domains} }            child { node {Key Problems} }
        }
        child { node {Computational Models}
            child { node {Turing Machines} }            child { node {Random-Access Machines} }
            child { node {Circuits} }                   child { node {Binary Decision Diagrams} }
            child { node {Oracle Machines} }            child { node {Programming in Logic} }
        }
        child { node {Measuring Complexity}
            child { node {Complexity Measures} }        child { node {Classifying Complexity} }
            child { node {Comparing Complexity} }       child { node {Describing Complexity} }
        }
        child { node {Solving Problems}
            child { node {Exact Algorithms} }           child { node {Randomization} }
            child { node {Fixed-Parameter Algorithms} } child { node {Parallel Computation} }
            child { node {Partial Solutions} }          child { node {Approximation} }
        };
        \end{tikzpicture}
        \caption{Mindmap}
        \label{test}
    \end{figure}

    The happy tree works fine but has wrong root ....

    \usetikzlibrary{arrows,shapes,positioning,shadows,trees}
    \tikzset{
        basic/.style  = {draw, text width=2cm, drop shadow, font=\sffamily, rectangle},
        root/.style   = {basic, rounded corners=2pt, thin, align=center,
            fill=green!30},
        level 2/.style = {basic, rounded corners=6pt, thin,align=center, fill=green!60,
            text width=8em},
        level 3/.style = {basic, thin, align=left, fill=pink!60, text width=6.5em}
    }
    \begin{tikzpicture}[
    level 1/.style={sibling distance=40mm},
    edge from parent/.style={->,draw},
    >=latex]

    % root of the the initial tree, level 1
    \node[root] {Drawing diagrams}
    % The first level, as children of the initial tree
    child {node[level 2] (c1) {Defining node and arrow styles}}
    child {node[level 2] (c2) {Positioning the nodes}}
    child {node[level 2] (c3) {Drawing arrows between nodes}};

    % The second level, relatively positioned nodes
    \begin{scope}[every node/.style={level 3}]
    \node [below of = c1, xshift=15pt] (c11) {Setting shape};
    \node [below of = c11] (c12) {Choosing color};
    \node [below of = c12] (c13) {Adding shading};

    \node [below of = c2, xshift=15pt] (c21) {Using a Matrix};
    \node [below of = c21] (c22) {Relatively};
    \node [below of = c22] (c23) {Absolutely};
    \node [below of = c23] (c24) {Using overlays};

    \node [below of = c3, xshift=15pt] (c31) {Default arrows};
    \node [below of = c31] (c32) {Arrow library};
    \node [below of = c32] (c33) {Resizing tips};
    \node [below of = c33] (c34) {Shortening};
    \node [below of = c34] (c35) {Bending};
    \end{scope}

    % lines from each level 1 node to every one of its "children"
    \foreach \value in {1,2,3}
    \draw[->] (c1.195) |- (c1\value.west);

    \foreach \value in {1,...,4}
    \draw[->] (c2.195) |- (c2\value.west);

    \foreach \value in {1,...,5}
    \draw[->] (c3.195) |- (c3\value.west);
    \end{tikzpicture}

\end{document}