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不同分割部位高度不同+箭头定位

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不同分割部位高度不同+箭头定位 
\documentclass{standalone}
\usepackage{tikz}
\usetikzlibrary{positioning,shapes.multipart} 

\begin{document}    


\tikzset{every loop/.style={min distance=1mm,in=110,out=70,looseness=2}}
  \begin{tikzpicture}[->, thick, remember picture]
    \node (0) at (-2,1) {};

    \node[draw, shape=rectangle split, rectangle split parts=2, inner sep=3ex] (A) at (0,0) {
        \begin{tikzpicture}[->, thick]
            \node[draw, shape=rectangle split, rectangle split parts=2, inner sep=1ex] (test) {Sound \nodepart{two} 0 \{ \}};
    \end{tikzpicture}
    \nodepart{two} 0 \{ \}}; %First Error

    \node[draw, shape=rectangle split, rectangle split parts=2] (B) at (4,0) {Camera     \nodepart{two} 5 \{no\_obj\}};

    \path[every node/.style={font=\sffamily\small}]
         (A) edge [loop above] node [above] {no\_obj} (A)
         (A.one east) edge node [above] {obj} (B.one west)

         (test.one east) edge node [below] {no\_obj, obj} (B.two west);

\end{tikzpicture}
\end{document}

我的问题是，如何才能使外部节点的第二个节点部分与Sound或Camera节点的第二个节点部分一样小？

我真的不知道为什么会发生这种情况，我希望你能帮助我。

实际情况

答案1

我已经通过文本宽度解决了这个问题，但我认为这不是应该采用的方式，而且它很丑，我需要手动为每张图片设置它。这是我得到的结果，我希望看到更好的解决方案：

\documentclass{standalone}
\usepackage{tikz}
\usetikzlibrary{positioning,shapes.multipart} 

\begin{document}    


\tikzset{every loop/.style={min distance=1mm,in=110,out=70,looseness=2}}
  \begin{tikzpicture}[->, thick, remember picture]
    \node (0) at (-2,1) {};

    \node[draw, shape=rectangle split, rectangle split parts=2, text width=5cm,
               text height = 3.5cm, text centered] (A) at (0,0) {
        \begin{tikzpicture}[->, thick]
            \node[draw, shape=rectangle split, rectangle split parts=2, text width=2cm, text height = 0.3cm, text centered] (test) {Sound \nodepart{two} 0 \{ \}};

            \node[draw, shape=rectangle split, rectangle split parts=2, text width=2cm, text height = 0.3cm, text centered] (Atest) at (0,2) {Test \nodepart{two} 0 \{ \}};
    \end{tikzpicture}
    \nodepart{two} 0 \{ \}}; %First Error

    \node[draw, shape=rectangle split, rectangle split parts=2] (B) at (4,0) {Camera     \nodepart{two} 5 \{no\_obj\}};

    \path[every node/.style={font=\sffamily\small}]
         (A) edge [loop above] node [above] {no\_obj} (A)
         (A.one east) edge node [above] {obj} (B.one west)

         (test.one east) edge node [below] {no\_obj, obj} (B.two west);

\end{tikzpicture}
\end{document}

在此处输入图片描述

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