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是否可以将节点放在箭头上方？

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是否可以将节点放在箭头上方？

是否可以更改下面代码中的输出箭头，以使其不与矩形重叠？

\documentclass[standalone]{article}

\usepackage{tikz}

\usetikzlibrary{positioning,decorations.markings,arrows}

\begin{document}

\begin{tikzpicture}[font=\small]
\tikzset{block/.style={draw, rectangle, line width=2pt, minimum height=3em, 
minimum width=5em, outer sep=0pt}}

\tikzset{vecArrow/.style={
  line width=1pt,
  decoration={
    markings,mark=at position 1 with {
       \arrow[scale=2.5,line width=0.4pt] {open triangle 60}
    }
  },
  double distance=4pt, shorten >= 13pt,
  preaction = {decorate},
  postaction = {draw,line width=4pt, white,shorten >= 10pt}
}}

\node [block] (A) {A};
\node[coordinate,right=2cm of A](B){};

\draw[vecArrow](A) -- node[above,align=center]{}(B);

\end{tikzpicture}

\end{document}

答案1

两种可能的解决方案：

  1. 您可以加载该backgrounds库，然后将箭头括在里面\begin{scope}[on background layer] ... \end{scope}。

  2. 或者，也许最好的解决方案是，您可以将其添加shorten <= \pgflinewidth,到vecArrow样式定义中。箭头将自动缩短以适应节点边框的宽度。

两种情况下的结果如下：

在此处输入图片描述

答案2

最简单的解决方案是在最后绘制最上面的内容。在这种情况下，由于您将节点相对于其他节点放置，因此您可以“覆盖”已经绘制的内容：

\documentclass[tikz, border=10pt]{standalone}

\usepackage{tikz}
\usetikzlibrary{
  positioning,
  decorations.markings,
  arrows
}
\tikzset{
  block/.style={
    draw, 
    rectangle, 
    line width=2pt, 
    minimum height=3em, 
    minimum width=5em,
    outer sep=0pt
  },
  vecArrow/.style={
    line width=1pt,
    decoration={
      markings,
      mark=at position 1 with {
        \arrow[scale=2.5,line width=0.4pt] {open triangle 60}
      }
    },
    double distance=4pt,
    shorten >=13pt,
    preaction={decorate},
    postaction={
      draw,
      line width=4pt, 
      white,
      shorten >= 10pt
    },
  },
}
\begin{document}
\begin{tikzpicture}[font=\small]
  \node [block] (A) {};
  \node [coordinate, right=2cm of A] (B) {};
  \draw[vecArrow](A) -- (B)
        node [pos=1, anchor=west] {Anders};
  \node [block] at (A) {A};
\end{tikzpicture}

\end{document}

输出

另外，也可以将节点放在命令末尾\draw，如上所示。

答案3

您可以在节点通过墨水绘制之前绘制路径append after command。

\documentclass[tikz]{standalone}
\usetikzlibrary{positioning,decorations.markings,arrows}

\begin{document}

\begin{tikzpicture}[font=\small]
\tikzset{block/.style={draw, rectangle, line width=2pt, minimum height=3em, 
minimum width=5em, outer sep=0pt}}

\tikzset{vecArrow/.style={
  line width=1pt,
  decoration={
    markings,mark=at position 1 with {
       \arrow[scale=2.5,line width=0.4pt] {open triangle 60}
    }
  },
  double distance=4pt, shorten >= 13pt,
  preaction = {decorate},
  postaction = {draw,line width=4pt, white,shorten >= 10pt}
}}

\draw[vecArrow] 
   node [block,append after command={coordinate[right = 2cm of A] (B) {(A) -- (B)}}] 
        (A) {A};

\end{tikzpicture}
\end{document}

这给出了其他答案中给出的相同图片

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