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平行盒 - 身份

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平行盒 - 身份

我该如何创建这个身份？有没有办法不用 tikz 来输入它？谢谢（我最大的问题是如何输入连接的框）

答案1

当然，这个图很简单，用 LaTeX 的picture环境就可以画出来，不需要任何额外的包：

\documentclass{article}
\begin{document}
\begin{picture}(250, 60)(0, -30)
  \put(0, 0){\line(1, 0){30}}
  \put(15, 2){\makebox(0, 0)[b]{$x(n)$}}
  \put(30, -20){\line(0, 1){40}}
  \put(30, -20){\line(1, 0){20}}
  \put(30, 20){\line(1, 0){20}}
  \put(50, -30){\framebox(30, 20){$h_2$}}
  \put(50, 10){\framebox(30, 20){$h_1$}}
  \put(80, -20){\line(1, 0){20}}
  \put(80, 20){\line(1, 0){20}}
  \put(100, -20){\line(0, 1){40}}
  \put(100, 0){\line(1, 0){30}}
  \put(115, 2){\makebox(0, 0)[b]{$y(n)$}}
  \put(145, 0){\makebox(0, 0){$\equiv$}}
  \put(160, 0){\line(1, 0){30}}
  \put(175, 2){\makebox(0, 0)[b]{$x(n)$}}
  \put(190, -10){\framebox(30, 20){$h(n)$}}
  \put(220, 0){\line(1, 0){30}}
  \put(235, 2){\makebox(0, 0)[b]{$y(n)$}}
\end{picture}
\end{document}

结果

为了好玩，一个适用于纯 TeX 的版本（也可以在 LaTeX 中使用），它仅限于基本框和\kern命令：

\hbox{%
  \raise1ex\hbox to 30pt{\hss$x(n)$\hss}%
  \kern-30pt
  \vrule height.2pt depth.2pt width30pt
  \kern-.2pt
  \vrule depth20.2pt height20.2pt width.4pt
  \kern-.4pt
  \vrule depth20.2pt height-19.8pt width20.8pt
  \kern-20.8pt
  \vrule depth-19.8pt height20.2pt width20.8pt
  \kern-.4pt
  \vrule depth30.2pt height-9.8pt width.4pt
  \kern-.4pt
  \vrule depth-9.8pt height30.2pt width.4pt
  \kern-.4pt
  \vrule depth30.2pt height-29.8pt width30.8pt
  \kern-30.8pt
  \vrule depth10.2pt height-9.8pt width30.8pt
  \kern-30.8pt
  \vrule depth-9.8pt height10.2pt width30.8pt
  \kern-30.8pt
  \vrule depth-29.8pt height30.2pt width30.8pt
  \kern-30.8pt
  \lower20pt\vbox to 0pt{\vss\hbox to 30.8pt{\hss$h_2$\hss}\vss}%
  \kern-30.8pt
  \raise20pt\vbox to 0pt{\vss\hbox to 30.8pt{\hss$h_1$\hss}\vss}%
  \kern-.4pt
  \vrule depth30.2pt height-9.8pt width.4pt
  \kern-.4pt
  \vrule depth-9.8pt height30.2pt width.4pt
  \kern-.4pt
  \vrule depth20.2pt height-19.8pt width20.8pt
  \kern-20.8pt
  \vrule depth-19.8pt height20.2pt width20.8pt
  \kern-.4pt
  \vrule depth20.2pt height20.2pt width.4pt
  \raise1ex\hbox to 30pt{\hss$y(n)$\hss}%
  \kern-30pt
  \vrule height.2pt depth.2pt width30pt
  \kern1em
  \vbox to 0pt{\vss\hbox{$\equiv$}\vss}%
  \kern1em
  \raise1ex\hbox to 30pt{\hss$x(n)$\hss}%
  \kern-30pt
  \vrule height.2pt depth.2pt width30pt
  \kern-.2pt
  \vrule depth10pt height10pt width.4pt
  \kern-.4pt
  \vrule depth10.2pt height-9.8pt width30.8pt
  \kern-30.8pt
  \vrule depth-9.8pt height 10.2pt width30.8pt
  \kern-30.6pt
  \vbox to 0pt{\vss\hbox to 30pt{\hss$h(n)$\hss}\vss}%
  \kern-.2pt
  \vrule depth10pt height10pt width.4pt
  \kern-.2pt
  \raise1ex\hbox to 30pt{\hss$y(n)$\hss}%
  \kern-30pt
  \vrule height.2pt depth.2pt width30pt
}
\bye

结果

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