20. LaTeX技巧634：Tikz绘制网络拓扑图

看图：

选自：http://tex.stackexchange.com/questions/41533/is-there-a-tikz-library-for-network-symbols/43445#43445

思科图元下载参看：http://tex.stackexchange.com/questions/22837/cisco-icons-for-network-diagrams

\documentclass{article}

\usepackage[hmargin=2.5cm]{geometry}

\usepackage{tikz}

\usetikzlibrary{calc, shadings, shadows, shapes.arrows}



% Styles for interfaces and edge labels

\tikzset{%

  interface/.style={draw, rectangle, rounded corners, font=\LARGE\sffamily},

  ethernet/.style={interface, fill=yellow!50},% ethernet interface

  serial/.style={interface, fill=green!70},% serial interface

  speed/.style={sloped, anchor=south, font=\large\sffamily},% line speed at edge

  route/.style={draw, shape=single arrow, single arrow head extend=4mm,

    minimum height=1.7cm, minimum width=3mm, white, fill=blue!20,

    drop shadow={opacity=.8, fill=blue!50!black}, font=\tiny}% inroute / outroute arrows

}

\newcommand*{\shift}{1.3cm}% For placing the arrows later



% The router icon

\newcommand*{\router}[1]{

\begin{tikzpicture}    

  \coordinate (ll) at (-3,0.5);

  \coordinate (lr) at (3,0.5);

  \coordinate (ul) at (-3,2);

  \coordinate (ur) at (3,2);

  \shade [shading angle=90, left color=black!40!blue, right color=white] (ll)

    arc (-180:-60:3cm and .75cm) -- +(0,1.5) arc (-60:-180:3cm and .75cm)

    -- cycle;

  \shade [shading angle=270, right color=black!40!blue, left color=white!50] (lr)

    arc (0:-60:3cm and .75cm) -- +(0,1.5) arc (-60:0:3cm and .75cm) -- cycle;

  \draw [thick] (ll) arc (-180:0:3cm and .75cm) -- (ur) arc (0:-180:3cm and .75cm)

    -- cycle;

  \draw [thick, shade, upper left=blue!30!black, lower left=blue!80!white,

    upper right=blue!80!white, lower right=white] (ul)

    arc (-180:180:3cm and .75cm);

  \node at (0,0.5){\color{blue!60!black}\Huge #1};% The name of the router

  % The four arrows, symbols for incoming and outgoing routes:

  \begin{scope}[yshift=2cm, yscale=0.28, transform shape]

    \node[route, rotate=45, xshift=\shift] {\strut};

    \node[route, rotate=-45, xshift=-\shift] {\strut};

    \node[route, rotate=-135, xshift=\shift] {\strut};

    \node[route, rotate=135, xshift=-\shift] {\strut};

  \end{scope}

\end{tikzpicture}}



\begin{document}

\pagestyle{empty}

\centering

\begin{tikzpicture}[node distance=10cm]

  % Place three routers as nodes:

  \node (R1) {\router{R1}};

  \node [right of=R1] (R2) {\router{R2}};

  \node[yshift=6cm] at ($ (R1) !.5! (R2) $)  (R3) {\router{R3}};

  % Connect by lines and specify interfaces and speed:

  \draw[thick] (R1)

    -- node[ethernet,  at start]{eth0} node[ethernet, at end] {eth0} (R2)

      node[speed,midway] {100 Mbps}

    -- node[serial,  at start]{S0} node[serial, at end] {S1} (R3)

      node[speed,midway] {115200 bps}

    -- node[serial,  at start]{S0} node[serial, at end] {S0} (R1)

      node[speed,midway] {64000 bps};

\end{tikzpicture}

\end{document}