Tikz：如何向节点锚点添加坐标？

Question

我有一个关于定位的问题。假设我们有两个节点 (A) 和 (B)。(A) 位于 (B) 的左侧：

\node (A) {A};
\node [left of=A] (B) {B};

我们可以在（A）和（B）之间画一条箭头，像这样：

\draw[->] (A.east) -- (B.west);

但是我怎样才能在这个箭头上方稍微画一个水平箭头，例如类似的(A.east)+(0,0.5cm)--(B.west)+(0,0.5cm)？（这不起作用；这只是为了让你明白我在要求什么。）

Answer 1

\documentclass{standalone} 
\usepackage{tikz}

\begin{document} 
\begin{tikzpicture}[>=latex]
  \node (A) {A};
  \node [left of=A] (B) {B};
  \draw[->] (A.east) -- (B.west);
  \draw[->] ([yshift=(2.5)]A.east) -- ([yshift=(2.5)]B.west);
\end{tikzpicture}
\end{document}

Answer 2

虽然yshift这是对您的问题的完美回答，但请注意，您也可以使用该calc库来实现与您要求的完全相同的目标：

\documentclass[tikz,border=3.14mm]{standalone} 
\usetikzlibrary{calc}

\begin{document} 
    \begin{tikzpicture}[>=latex]
    \node (A) {A};
        \node [left of=A] (B) {B};
        \draw[->] (A.east) -- (B.west);
        \draw[->] ($(A.east)+(0,0.5)$) -- ($(B.west)+(0,0.5)$);
    \end{tikzpicture}
\end{document}

Answer 3

像这样（两个解决方案）

\documentclass{standalone} 
\usepackage{tikz}
\usetikzlibrary{positioning,calc}
\begin{document} 
\begin{tikzpicture}[>=latex]
  \node (A) {A};
  \node [left of=A] (B) {B};
  \draw[->] (A.east) -- (B.west);
   \draw[->,blue] (A.20) coordinate(dd)-- (dd-|B.west);
   \draw[->,red] ($(A.east)!0.5!(A.north east)$) coordinate(dd) -- (dd-|B.west);
\end{tikzpicture}
\end{document}

Answer 4

\documentclass {scrartcl}
\usepackage{tikz}
\usetikzlibrary{positioning}
\begin{document}


\begin{tikzpicture}  
    \tikzstyle{vertex} = [ color=black, text=black, fill=black!10]
    \tikzstyle{edge} = [thick]
    
  \node[draw, vertex] (A) {A};
  \node[draw, vertex, left=of A] (B) {B};
  \draw[->, red, thick] (A.west) -- (B.east);
  \draw[->, green, thick] (A.150) -- (B.30);
  \draw[->, blue, thick] (A.210) -- (B.-30);
\end{tikzpicture}
\end{document}