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Tikz 矩形箭頭

tag-icon • tag-icon tikz-pgf tikz-matrix
Tikz 矩形箭頭

我在“矩形”箭頭上放置標籤時遇到問題。我想將標籤分別放置在最右和最左箭頭的中間和最右邊或最左邊。有誰知道如何做到這一點？謝謝！

我的程式碼

\begin{center} 
\begin{tikzpicture} 
\matrix(cd)[matrix of math nodes,
  row sep=2.6em, column sep=2cm, 
  text height=1.5ex, text depth=0.25ex]{
  F_0a & F_0b \\ 
  F_1a & F_1b \\ 
  F_2a & F_2b \\
}; 
\draw[->] (cd-1-1) edge node[label=above:$F_0f$] (U) {} (cd-1-2); 
\draw[->] (cd-2-1) edge node[label=above:$F_1f$] (V) {} (cd-2-2); 
\draw[->] (cd-3-1) edge node[label=below:$F_2f$] (W) {} (cd-3-2); 
\draw[->] (cd-1-1) edge node[label=left:$t_a$ ] (U) {} (cd-2-1); 
\draw[->] (cd-2-1) edge node[label=left:$t'_a$] (V) {} (cd-3-1); 
\draw[->] (cd-1-2) edge node[label=right:$t_b$ ] (W) {} (cd-2-2); 
\draw[->] (cd-2-2) edge node[label=right:$t'_b$] (U) {} (cd-3-2); 
\draw[->] (cd-1-1.west) -| ++(-.5,0) node[label=left :$(t'\circ t)_a$] {} |- (cd-3-1.west); 
\draw[->] (cd-1-2.east) -| ++(.5,0)  node[label=right:$(t'\circ t)_b$] {} |- (cd-3-2.east); 
\end{tikzpicture} 
\end{center}

答案1

一個快速的解決方案是使用矩陣條目作為參考點來放置節點，而不是沿著路徑放置它們：

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{matrix}

\begin{document}

\begin{center} 
\begin{tikzpicture} 
\matrix(cd)[matrix of math nodes,
  row sep=2.6em, column sep=2cm, 
  text height=1.5ex, text depth=0.25ex]{
  F_0a & F_0b \\ 
  F_1a & F_1b \\ 
  F_2a & F_2b \\
}; 
\draw[->] (cd-1-1) edge node[label=above:$F_0f$] (U) {} (cd-1-2); 
\draw[->] (cd-2-1) edge node[label=above:$F_1f$] (V) {} (cd-2-2); 
\draw[->] (cd-3-1) edge node[label=below:$F_2f$] (W) {} (cd-3-2); 
\draw[->] (cd-1-1) edge node[label=left:$t_a$ ] (U) {} (cd-2-1); 
\draw[->] (cd-2-1) edge node[label=left:$t'_a$] (V) {} (cd-3-1); 
\draw[->] (cd-1-2) edge node[label=right:$t_b$ ] (W) {} (cd-2-2); 
\draw[->] (cd-2-2) edge node[label=right:$t'_b$] (U) {} (cd-3-2); 
\draw[->] (cd-1-1.west) -| ++(-.5,0) |- (cd-3-1.west); 
\draw[->] (cd-1-2.east) -| ++(.5,0) |- (cd-3-2.east);
\node[anchor=east,xshift=-16pt] at (cd-2-1.west) {$(t'\circ t)_a$}; \node[anchor=west,xshift=16pt] at (cd-2-2.east) {$(t'\circ t)_b$}; 
\end{tikzpicture} 
\end{center} 

\end{document}

在此輸入影像描述

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