为电子多路复用器定义新的节点形状

Question

我发现这这个问题建议用这个路径制作多路复用器符号：

(0,0) -- (1,-0.5) -- (1,-1.25) -- (1.3,-1.25) -- (1,-1.25)-- (1,-2) -- (0,-2.5) --
(0,-1.75) -- (-0.3,-1.75) -- (0,-1.75) -- (0,-0.75) -- (-0.3,-0.75) -- (0,-0.75) -- 
(0,0)

答案建议这样做以将其用作符号：

\documentclass{article}
\usepackage{tikz}
\newcommand\multiplexer[1][1]{%
  \begin{tikzpicture}[scale=#1]
  \draw (0,0) -- (1,-0.5) -- (1,-1.25) -- (1.3,-1.25) -- (1,-1.25)-- (1,-2) -- (0,-2.5) -- (0,-1.75) -- (-0.3,-1.75) -- (0,-1.75) -- (0,-0.75) -- (-0.3,-0.75) -- (0,-0.75) -- (0,0);
  \end{tikzpicture}
}
\begin{document}
  \multiplexer[0.2]

   This is a symbol: \multiplexer
\end{document}

我想使用这样的符号作为节点形状，如果可能的话，这样输入和输出就可以轻松连接。

我看见创建节点形状，但这需要非常熟悉 PGF，而我并不熟悉。有没有其他方法或变通方法可以以某种方式将此路径用作形状？

Answer 1

没有必要定义新的形状；shapes.geometric库已经为您提供了trapezium形状；通过这个，您可以简单地定义一种样式；现在可以轻松地将现有的梯形锚点用于进出部分：

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{shapes.geometric}

\tikzset{
  multiplexer/.style={
    draw,
    trapezium,
    shape border uses incircle, 
    shape border rotate=270,
    minimum size=18pt
  }  
}

\begin{document}

\begin{tikzpicture}
\node[multiplexer]
  (mul) at (0,1) {};
\draw (mul.top side) --++(10pt,0) ; 
\draw (mul.south west) --++(-10pt,0) ; 
\draw (mul.north west) --++(-10pt,0) ; 
\end{tikzpicture}

\end{document}

Answer 2

您可以使用pic来实现这一点。

\documentclass[tikz,border=7mm]{standalone}
\usetikzlibrary{calc,quotes}
\tikzset{
  multiplexer/.pic ={
    \coordinate (-out) at (.8,0);
    \coordinate (-in-up) at (-0.8,.5);
    \coordinate (-in-down) at (-0.8,-.5);
    \draw[pic actions] (-.5,1.25) -- ++(1,-.5) -- ++(0,-1.5) -- ++(-1,-.5) --cycle;
    \draw[pic actions] (.5,0) -- (-out) (-in-up) -- +(.3,0) (-in-down) -- +(.3,0);
    \node{ \tikzpictext};
  }
}

\begin{document}
\begin{tikzpicture}
  \pic["One"] (one) {multiplexer};
  \pic[fill=red,"Two"] (two) at (-3,2) {multiplexer};
  \pic[fill=yellow,"Three"] (three) at (-3,-2) {multiplexer};
  \draw (two-out) -| (one-in-up);
  \draw (three-out) -| (one-in-down);
\end{tikzpicture}
\end{document}