TikZ：相对位置的问题

Question

我在 TikZ 中使用相对定位时遇到问题。如下面的 MWE 所示，当使用 \node[right = of ...] 语法并排放置两个图形时，我的“顶点圆”放置不正确。

使用“right = of ...”语法的代码：

\documentclass{standalone}
\usepackage{tikz}
\usetikzlibrary{positioning}

\tikzset{
    vertex/.style={circle,fill=black,minimum size=.8mm,inner sep=0pt}
}

\begin{document}
\begin{tikzpicture}
\node (2nd_1) at (0,0) {
    \tikz{
        \coordinate (u1) at (0,0);
        \coordinate[below= of u1] (l1);
        \coordinate[right= of u1] (u2);
        \coordinate[right= of l1] (l2);
        %           
        \draw           (u1)    --  (l1);
        \draw           (u2)    --  (l2);
        \draw           (l1)    --  (l2);
        \draw           (l1)        node[vertex]{};
        \draw           (l2)        node[vertex]{};
    }
};
\node[right=0 of 2nd_1] (2nd_2) {
    \tikz{
        \coordinate (u1) at (0,0);
        \coordinate[below= of u1] (l1);
        \coordinate[right= of u1] (u2);
        \coordinate[right= of l1] (l2);
        %           
        \draw           (u1)    --  (l1);
        \draw           (u2)    --  (l2);
        \draw           (l1)    --  (l2);
        \draw           (l1)        node[vertex]{};
        \draw           (l2)        node[vertex]{};
    }
};
\end{tikzpicture}
\end{document}

手动设置位置的代码：

\begin{tikzpicture}
\node (2nd_1) at (0,0) {
    \tikz{
        \coordinate (u1) at (0,0);
        \coordinate[below= of u1] (l1);
        \coordinate[right= of u1] (u2);
        \coordinate[right= of l1] (l2);
        %           
        \draw           (u1)    --  (l1);
        \draw           (u2)    --  (l2);
        \draw           (l1)    --  (l2);
        \draw           (l1)        node[vertex]{};
        \draw           (l2)        node[vertex]{};
    }
};
\node (2nd_2) at (1.5,0) {
    \tikz{
        \coordinate (u1) at (0,0);
        \coordinate[below= of u1] (l1);
        \coordinate[right= of u1] (u2);
        \coordinate[right= of l1] (l2);
        %           
        \draw           (u1)    --  (l1);
        \draw           (u2)    --  (l2);
        \draw           (l1)    --  (l2);
        \draw           (l1)        node[vertex]{};
        \draw           (l2)        node[vertex]{};
    }
};
\end{tikzpicture}

左图：使用“right = of”语法。右图：手动定位

从图片中可以明显看出，左侧第二个图形上的顶点圆放置不正确。我似乎无法弄清楚错误源自何处，因此任何帮助/解释都值得感激。

Answer 1

消息的另一个案例研究：不要嵌套 tikzpictures！\tikz{}由于处于同一范围内，内容继承了节点选项，因此它不会启动tikzpicture环境的全新副本。

如果您想将事物分组在一起，请使用范围并转​​移范围。

\documentclass[tikz]{standalone}
\usetikzlibrary{positioning}
\tikzset{vertex/.style={circle,fill=black,minimum size=.8mm,inner sep=0pt}}

\begin{document}
\begin{tikzpicture}
        \coordinate (u1) at (0,0);
        \coordinate[below= of u1] (l1);
        \coordinate[right= of u1] (u2);
        \coordinate[right= of l1] (l2);
        %           
        \draw           (u1)    --  (l1);
        \draw           (u2)    --  (l2);
        \draw           (l1)    --  (l2);
        \draw           (l1)        node[vertex]{};
        \draw           (l2)        node[vertex]{};

\begin{scope}[shift={([xshift=1cm]u2)}]
        \coordinate (u1) at (0,0);
        \coordinate[below= of u1] (l1);
        \coordinate[right= of u1] (u2);
        \coordinate[right= of l1] (l2);
        %           
        \draw           (u1)    --  (l1);
        \draw           (u2)    --  (l2);
        \draw           (l1)    --  (l2);
        \draw           (l1)        node[vertex]{};
        \draw           (l2)        node[vertex]{};
\end{scope}
\end{tikzpicture}
\end{document}