边缘上方节点的水平对齐

Question

我使用 tikz 制作了下图。它几乎满足了我的要求，但我想知道是否有办法将文本对齐到边缘。具体来说，我希望文本

1. 边缘之上
2. 与中间边缘的文本中心对齐

遵循的 MWE 将文本放在边缘上方，但不对齐文本。

\documentclass[multi=tikzpicture, border=1mm]{standalone}
\usepackage{tikz}

\begin{document}

\begin{tikzpicture}
\node (x1) at (5,0) {$x_1$};

\node (y1) at (4,2.5) {$Y_1$};
\node (y2) at (5,2.5) {$    \cdots$};
\node (y3) at (6,2.5) {$Y_k$};

\node (mu1) at (5,5) {$    \mu_1$};

\draw (x1) edge  (y1);
\draw (x1) edge  (y2);
\draw (x1) edge  (y3);

\draw (y1) edge  (mu1);
\draw (y2) edge  (mu1);
\draw (y3) edge  (mu1);

\path (x1) edge node[above] (one) {this is $x$} (11,0);
\path (y3) edge node[above] (one) {this is $Y$} (11,2.5);
\path (mu1) edge node[above] (one) {this is $mu$} (11,5);
\end{tikzpicture}

\end{document}

非常感谢您的帮助！提前致谢！

Answer 1

一种可能的方法是绘制线条后添加两个节点，例如使用

\node[above] at (one |- y3) {this is $Y$};

这里(one |- y3)表示 x 坐标为one， y 坐标为 的点y3（读|-作从第一个坐标垂直方向，从第二个坐标水平方向）。

\documentclass[multi=tikzpicture, border=1mm]{standalone}
\usepackage{tikz}

\begin{document}

\begin{tikzpicture}
\node (x1) at (5,0) {$x_1$};

\node (y1) at (4,2.5) {$Y_1$};
\node (y2) at (5,2.5) {$    \cdots$};
\node (y3) at (6,2.5) {$Y_k$};

\node (mu1) at (5,5) {$    \mu_1$};

\draw (x1) edge  (y1);
\draw (x1) edge  (y2);
\draw (x1) edge  (y3);

\draw (y1) edge  (mu1);
\draw (y2) edge  (mu1);
\draw (y3) edge  (mu1);

\path (x1) edge node[above] (one) {this is $x$} (11,0);
\path (y3) edge (11,2.5);
\path (mu1) edge (11,5);

\node[above] at (one |- y3) {this is $Y$};
\node[above] at (one |- mu1) {this is $mu$};
\end{tikzpicture}

\end{document}