我必须创建一个 Petri 网作为大学家庭作业。在 Tikz 手册中，我找到了一个非常有用的教程，介绍如何使用 Tikz/PGF 创建 Petri 网。但是，该示例使用的转换样式与我的教授喜欢的样式不同。他使用的样式类似于维基百科上的样式：
请注意，过渡（t）由一个小黑条表示。但是，Tikz 教程中的示例如下所示：
在这里，过渡由矩形框表示。有人知道我该如何更改过渡的样式吗？我认为这可以很容易地完成，但请注意，我是 Tikz 的新手，我几乎不了解上述 petri 网的源代码。
这是来自 Tikz 指南的源代码：（我将其范围缩小了一些，因此它仅包含左 Petri 网）
\documentclass{article}
\usepackage[version=0.96]{pgf}
\usepackage{tikz}
\usetikzlibrary{arrows,shapes,automata,petri}
\begin{document}
\begin{tikzpicture}[node distance=1.3cm,>=stealth',bend angle=45,auto]
\tikzstyle{place}=[circle,thick,draw=blue!75,fill=blue!20,minimum size=6mm]
\tikzstyle{transition}=[rectangle,thick,draw=black!75,
fill=black!20,minimum size=4mm]
\node [place,tokens=1] (w1) {};
\node [place] (c1) [below of=w1] {};
\node [place] (s) [below of=c1,label=above:$s\le 3$] {};
\node [place] (c2) [below of=s] {};
\node [place,tokens=1] (w2) [below of=c2] {};
\node [transition] (e1) [left of=c1] {}
edge [pre,bend left] (w1)
edge [post,bend right] (s)
edge [post] (c1);
\node [transition] (e2) [left of=c2] {}
edge [pre,bend right] (w2)
edge [post,bend left] (s)
edge [post] (c2);
\node [transition] (l1) [right of=c1] {}
edge [pre] (c1)
edge [pre,bend left] (s)
edge [post,bend right] node[swap] {2} (w1);
\node [transition] (l2) [right of=c2] {}
edge [pre] (c2)
edge [pre,bend right] (s)
edge [post,bend left] node {2} (w2);
\end{tikzpicture}
\end{document}
非常感谢您的帮助！
答案1
transition例如，您可以将样式更改为
transition/.style={
rectangle,
thick,
fill=black,
minimum width=8mm,
inner ysep=2pt
}
请注意，我将弃用的语法更改\tikzstyle为更合适的\tikzset语法。
\documentclass{article}
\usepackage[version=0.96]{pgf}
\usepackage{tikz}
\usetikzlibrary{arrows,shapes,automata,petri}
\tikzset{
place/.style={
circle,
thick,
draw=blue!75,
fill=blue!20,
minimum size=6mm
},
transition/.style={
rectangle,
thick,
fill=black,
minimum width=8mm,
inner ysep=2pt
}
}
\begin{document}
\begin{tikzpicture}[node distance=1.3cm,>=stealth',bend angle=45,auto]
\node [place,tokens=1] (w1) {};
\node [place] (c1) [below of=w1] {};
\node [place] (s) [below of=c1,label=above:$s\le 3$] {};
\node [place] (c2) [below of=s] {};
\node [place,tokens=1] (w2) [below of=c2] {};
\node [transition] (e1) [left of=c1] {}
edge [pre,bend left] (w1)
edge [post,bend right] (s)
edge [post] (c1);
\node [transition] (e2) [left of=c2] {}
edge [pre,bend right] (w2)
edge [post,bend left] (s)
edge [post] (c2);
\node [transition] (l1) [right of=c1] {}
edge [pre] (c1)
edge [pre,bend left] (s)
edge [post,bend right] node[swap] {2} (w1);
\node [transition] (l2) [right of=c2] {}
edge [pre] (c2)
edge [pre,bend right] (s)
edge [post,bend left] node {2} (w2);
\end{tikzpicture}
\end{document}
答案2
我稍微修改了一下代码，让它和你一开始展示的代码类似。试试看！
\documentclass{article}
\usepackage[version=0.96]{pgf}
\usepackage{tikz}
\usetikzlibrary{arrows,shapes,automata,petri}
\tikzset{
place/.style={
circle,
thick,
draw=black,
%fill=blue!20,
minimum size=6mm
},
transition/.style={
rectangle,
thick,
draw=black,
minimum width=8mm,
inner ysep=2pt
}
}
\begin{document}
\begin{tikzpicture}[node distance=1.5cm,>=stealth',bend angle=45,auto]
\node [place,tokens=2] (w1) [label=above:$N$] {};
\node [place,inner sep=0pt, minimum size=0pt] (blank) [left of=w1] {};
\node [place,tokens=2] (c1) [left of=blank, label=above:$H$] {};
\node [transition] (e1) [below of=blank, label=right:$s$] {}
edge [pre] (w1)
edge [pre] node{2} (c1);
\node [place] (d1) [below of=e1, label=below:$N_2H$] {}
edge [pre] (e1);
\end{tikzpicture}
\end{document}