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如何垂直对齐 tikz 图中标签

tag-icon • tag-icon tikz-pgf diagrams
如何垂直对齐 tikz 图中标签

在此处输入图片描述

我在 TikZ 中绘制了带有对角箭头的上图，但标签看起来像是放在曲线上而不是彼此相邻。我想我明白为什么它们会这样放置：TikZ 将标签放在箭头中间，而对角箭头的末端略低。但我无法解决这个问题。

我为此图编写的代码是：

\documentclass[border=1]{standalone}
\usepackage{tikz}
\usetikzlibrary{matrix,arrows}

\begin{document}
\begin{tikzpicture}
[
  arr/.style={->,font=\scriptsize},
  description/.style={fill=white,inner sep=2pt}
]
\matrix (m) [
  matrix of math nodes, row sep=3em, column sep=4em, text height=1.5ex, text depth=0.25ex
] 
{A[f]_0:=A & A[f]_1 & A[f]_2 & \cdots \\
                    &        & B      \\};
\draw[arr] (m-1-1) -- node[above]       {$\pi_0$}  (m-1-2); 
\draw[arr] (m-1-1) -- node[description] {$f_0:=f$} (m-2-3);
\draw[arr] (m-1-2) -- node[above]       {$\pi_1$}  (m-1-3);
\draw[arr] (m-1-2) -- node[description] {$f_1$}    (m-2-3);
\draw[arr] (m-1-3) -- node[above]       {$\pi_2$}  (m-1-4);
\draw[arr] (m-1-3) -- node[description] {$f_2$}    (m-2-3);
\draw[arr] (m-1-4) -- node[description] {$f_3$}    (m-2-3);
\end{tikzpicture}
\end{document}

所以问题是：我怎样才能将标签$f_0:=f$、$f_1$和$f_2$放在$f_3$相同的高度，最好是的高度$f_2$？

答案1

正如我在评论中所说的那样，您需要设置一条水平线。我选择f_2它作为参考点，并在放置在路径上时为其命名

\draw[arr] (m-1-3) -- node[description] (f2) {$f_2$} (m-2-3)

水平线交叉点f2声明为

\path[name path=pf2] (m-1-1|-f2)--(m-1-4|-f2);

然后你需要name所有其他路径，如

\draw[arr,name path=pf0] (m-1-1) -- (m-2-3);

并在交叉点处放置标签

\node[arr,description,name intersections={of=pf0 and pf2}] (f0) at (intersection-1) {$f_0:=f$};

我的完整代码是

\documentclass[border=1]{standalone}
\usepackage{tikz}
\usetikzlibrary{matrix,arrows,intersections}

\begin{document}

\begin{tikzpicture}
[
  arr/.style={->,font=\scriptsize},
  description/.style={fill=white,inner sep=2pt}
]
\matrix (m) [
  matrix of math nodes, row sep=3em, column sep=4em, text height=1.5ex, text depth=0.25ex
] 
{A[f]_0:=A & A[f]_1 & A[f]_2 & \cdots \\
                    &        & B      \\};
\draw[arr] (m-1-1) -- node[above]       {$\pi_0$}  (m-1-2); 
\draw[arr] (m-1-2) -- node[above]       {$\pi_1$}  (m-1-3);
\draw[arr] (m-1-3) -- node[above]       {$\pi_2$}  (m-1-4);

\draw[arr] (m-1-3) -- node[description] (f2) {$f_2$}    (m-2-3);
\draw[arr,name path=pf0] (m-1-1) -- (m-2-3);
\draw[arr,name path=pf1] (m-1-2) -- (m-2-3);
\draw[arr,name path=pf3] (m-1-4) -- (m-2-3);
\path[name path=pf2] (m-1-1|-f2)--(m-1-4|-f2);
\draw[red] (m-1-1|-f2)--(m-1-4|-f2);

\node[arr,description,name intersections={of=pf0 and pf2}] (f0) at (intersection-1) {$f_0:=f$};
\node[arr,description,name intersections={of=pf1 and pf2}] (f1) at (intersection-1) {$f_1$};
\node[arr,description,name intersections={of=pf3 and pf2}] (f3) at (intersection-1) {$f_3$};
\end{tikzpicture}

\end{document}

结果

在此处输入图片描述

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