答案1
纯 TikZ (smartdiagram
够智能了吗?):
\documentclass[tikz,
border=3mm,
]{standalone}
\usetikzlibrary{arrows.meta,
positioning,
shapes.symbols,
}
\begin{document}
\begin{tikzpicture}[
node distance = 2mm and 5mm,
sgn/.style = {signal, draw, signal from=west,
minimum height=1.2em, minimum width=3em},
]
\node (n1) [sgn] {$x$};
\coordinate[below right=of n1] (a);
\node (n2) [sgn,below left=of a] {$y$};
%
\node (n3) [sgn,right=7mm of a] {$z$};
\coordinate[right=of n3] (b);
\node (n4) [sgn,above right=of b] {$a$};
\node (n5) [sgn,below right=of b] {$b$};
%
\draw[gray,thick]
(n1) -| (a) |- (n2)
(n3) -- (b);
\draw[-Straight Barb]
(a) -- (n3.north west |- n3.west);
\draw[Straight Barb-Straight Barb]
(n4.north west |- n4.west) -| (b) |- (n5.north west |- n5.west);
\end{tikzpicture}
\end{document}
笔记:以后请考虑车牌评论,现在你很幸运得到答案(因为你是新手)。