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如何在节点下创建节点

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如何在节点下创建节点 
\documentclass{minimal}
\usepackage[a4paper,margin=1cm,landscape]{geometry}
\usepackage{tikz}
\usetikzlibrary{positioning,shapes,shadows,arrows}

\begin{document}
\tikzstyle{abstract}=[rectangle, draw=black, rounded corners, fill=blue!40, drop shadow,
        text centered, anchor=north, text=white, text width=3cm]
\tikzstyle{comment}=[rectangle, draw=black, rounded corners, fill=green, drop shadow,
        text centered, anchor=north, text=white, text width=3cm]
\tikzstyle{myarrow}=[->, >=open triangle 90, thick]
\tikzstyle{line}=[-, thick]
        
\begin{center}
\begin{tikzpicture}[node distance=2cm]
    \node (Item) [abstract, rectangle split, rectangle split parts=2]
        {
            \textbf{ITEM}
            \nodepart{second}name
        };
    \node (AuxNode01) [text width=4cm, below=of Item] {};
    \node (Component) [abstract, rectangle split, rectangle split parts=2, left=of AuxNode01]
        {
            \textbf{COMPONENT}
            \nodepart{second}nil
        };
    \node (System) [abstract, rectangle split, rectangle split parts=2, right=of AuxNode01]
        {
            \textbf{SYSTEM}
            \nodepart{second}parts
        };
   
    \draw[myarrow] (Component.north) -- ++(0,0.8) -| (Item.south);
    \draw[line] (Component.north) -- ++(0,0.8) -| (System.north);
        
\end{tikzpicture}
\end{center}
\end{document}

我修改了发布的示例这里。作者在“ITEM”下方放置了一个虚拟节点 \node (AuxNode01) [text width=4cm, below=of Item] {};，并在其右侧和左侧创建了两个节点。

现在我的问题是如何在项目正下方，即虚拟节点所在的位置创建第三个节点。我凭直觉尝试了at & over，但没有成功。

答案1

如果我正确理解了您要做的事情，那么“at”实际上是正确的，但您把它放在了不同的地方：

\node (Blah) at (AuxNode01) [abstract, rectangle split, rectangle split parts=2]
    {
        \textbf{BLAH}
        \nodepart{second}parts
    };

anchor=north为了正确定位，您应该从样式定义中删除abstract（无论如何，我不太清楚它为什么在那里）。

答案2

这是你想要的吗？

流程图

在这种情况下，您可以使用at (<node name>)，并且您需要使用新节点的选项，因为它在全局选项中anchor=center设置为。north

\documentclass{minimal}
\usepackage[a4paper,margin=1cm,landscape]{geometry}
\usepackage{tikz}
\usetikzlibrary{positioning,shapes,shadows,arrows}

\begin{document}
\tikzstyle{abstract}=[rectangle, draw=black, rounded corners, fill=blue!40, drop shadow,
        text centered, anchor=north, text=white, text width=3cm]
\tikzstyle{comment}=[rectangle, draw=black, rounded corners, fill=green, drop shadow,
        text centered, anchor=north, text=white, text width=3cm]
\tikzstyle{myarrow}=[->, >=open triangle 90, thick]
\tikzstyle{line}=[-, thick]

\begin{center}
\begin{tikzpicture}[node distance=2cm]
    \node (Item) [abstract, rectangle split, rectangle split parts=2]
        {
            \textbf{ITEM}
            \nodepart{second}name
        };
    \node (AuxNode01) [text width=4cm, below=of Item] {};
    \node (Component) [abstract, rectangle split, rectangle split parts=2, left=of AuxNode01]
        {
            \textbf{COMPONENT}
            \nodepart{second}nil
        };
    \node (System) [abstract, rectangle split, rectangle split parts=2, right=of AuxNode01]
        {
            \textbf{SYSTEM}
            \nodepart{second}parts
        };

    \node (New) [abstract, rectangle split, rectangle split parts=2,anchor=center] at (AuxNode01)
        {
            \textbf{SYSTEM}
            \nodepart{second}parts
        };

    \draw[myarrow] (Component.north) -- ++(0,0.8) -| (Item.south);
    \draw[line] (Component.north) -- ++(0,0.8) -| (System.north);

\end{tikzpicture}
\end{center}
\end{document}

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