垂直对齐和线

Question

我在用 tikz 绘制简单图表时遇到了麻烦。我想要的是一个在左对齐节点之间绘制线条的图表。但垂直对齐会使线条倾斜/倾斜，看起来很丑陋（见下面的示例）。我该如何避免这种情况？

\documentclass{standalone}
\usepackage{tikz}
\usetikzlibrary{matrix}
\begin{document}
\begin{tikzpicture}[every node/.style={anchor=base west}]
\matrix [matrix of math nodes, row sep=5mm] {
\node (X) {X_{i}}; \\
\node (Y) {Y_{ij}}; \\
\node (Z) {Z_{ijk}}; \\
};
\draw (X) -- (Y);
\draw (Y) -- (Z);
\end{tikzpicture}
\end{document}

Answer 1

像这样吗？

\documentclass{standalone}
\usepackage{tikz}
\usetikzlibrary{matrix}
\begin{document}
\begin{tikzpicture}[every node/.style={anchor=base west}]
\matrix [matrix of math nodes, row sep=5mm] {
\node (X) {X_{i}}; \\
\node (Y) {Y_{ij}}; \\
\node (Z) {Z_{ijk}}; \\
};
\draw (X) -- (Y.north -| X); % <--- added -| X for determining coordinate 
                             % cross vertical line through middle of X 
                             % and horizontal through north of Y
\draw (Y) -- (Z.north -| X);
\end{tikzpicture}
\end{document}

Answer 2

这可能是一份工作tikz-cd：

\documentclass{standalone}
\usepackage{tikz-cd}

\begin{document}

\begin{tikzcd}[arrows=dash]
X_{i} \arrow[d] \\
Y_{ij} \arrow[d] \\
Z_{ijk}
\end{tikzcd}

\end{document}