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| % 流程图定义基本形状 \tikzstyle{startstop} = [rectangle, rounded corners, minimum width = 2cm, minimum height=1cm,text centered, draw = black, fill = red!40] \tikzstyle{io} = [trapezium, trapezium left angle=70, trapezium right angle=110, minimum width=2cm, minimum height=1cm, text centered, draw=black, fill = blue!40] \tikzstyle{process} = [rectangle, minimum width=3cm, minimum height=1cm, text centered, draw=black, fill = yellow!50] \tikzstyle{decision} = [diamond, aspect = 3, text centered, draw=black, fill = green!30] % 箭头形式 \tikzstyle{arrow} = [->,>=stealth]
\begin{figure}[htbp] \centering \begin{tikzpicture}[node distance=2cm] %定义流程图具体形状 \node (start) [startstop] {start}; \node (pro1) [process, below of=start, yshift=-0.2cm, left of=start, xshift=-1cm] {PROCESS 1}; \node (pro2) [process, right of=pro1, xshift= 4cm] {PROCESS 2}; \node (in1) [io, below of=pro1, yshift= -0.2cm, right of=pro1, xshift=1cm] {IO}; \node (pro3) [process, below of=in1, yshift= -0.2cm] {PROCESS 3}; \node (pro4) [process, below of=pro3, yshift= -0.2cm] {PROCESS 4}; \node (in2) [io, below of=pro4, yshift= -0.2cm] {IO 2}; \node (dec1) [decision, below of=in2, yshift= -0.2cm] {DECISION}; \node (stop) [startstop, below of=dec1] {end};
%连接具体形状 \draw [arrow](start) -- (pro1); \draw [arrow](start) -- (pro2); \draw [arrow](pro1) -- (in1); \draw [arrow](pro2) -- (in1); \draw [arrow](in1) -- (pro3); \draw [arrow](pro3) -- (pro4); \draw [arrow](pro4) -- (in2); \draw [arrow](in2) -- (dec1); \draw [arrow](dec1) -- ($(dec1.east) + (1.5,0)$) node[anchor=north] {NO} |- (pro3); \draw [arrow](dec1) -- node[anchor=west] {YES} (stop); \end{tikzpicture} \caption{\label{fig: } 示例图} \end{figure}
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