如何减小节点和标签的大小 - tikz 包

Question

我试图使用 tikz 包绘制一个自动机，我想减小每个边上的节点和标签的大小，我试图把选项[比例=0.5]但它不起作用！我有：

\documentclass{article} 
\usepackage{tikz}
\usetikzlibrary{arrows,positioning,automata,shadows,fit,shapes}


 \begin{document}


\begin{tikzpicture}[shorten >=1pt, node distance=2.5cm, on grid, auto,thick,initial text=,scale=0.3]
 \node[state, initial]            (0)                          {0};
 \node[state]                     (1)   [above right =of 0]    {1};
 \node[state]                     (2)   [right =of 0]          {2};
 \node[state,accepting]           (3)   [right =of 2]          {3};



 \path[->]      (0)  edge       node           {a:a / 1.61}   (1)
             (0)  edge       node           {b:b/ 0.22}   (2)
             (2)  edge       [loop below]  node         {b:a/ 0.69}   ()
             (2)  edge       node           {b:a/ 0.69}   (3);

 \end{tikzpicture}
\end{document}

这给了我一张不太漂亮的照片：

Answer 1

\documentclass{article} 
\usepackage{tikz}
\usetikzlibrary{arrows,positioning,automata,shadows,fit,shapes}


 \begin{document}


\begin{tikzpicture}[shorten >=1pt, node distance=2.5cm, on grid, auto,thick,initial text=,scale=0.3]
 \node[state, initial]            (0)                          {0};
 \node[state]                     (1)   [above right =of 0]    {1};
 \node[state]                     (2)   [right =of 0]          {2};
 \node[state,accepting]           (3)   [right =of 2]          {3};



 \begin{scope}[every node/.style={scale=.5}]
     \path[->]   (0)  edge       node           {a:a / 1.61}   (1)
                 (0)  edge       node           {b:b/ 0.22}   (2)
                 (2)  edge       [loop below]  node         {b:a/ 0.69}   ()
                 (2)  edge       node           {b:a/ 0.69}   (3);  
 \end{scope}


 \end{tikzpicture}
\end{document} 

Answer 2

[en] 就我而言，在绘制图表时，我更喜欢用 em 来记录所有距离，这样可以通过局部更改字体大小来更改图表大小

[fr] 对我来说，当我开始追踪一个图表时，我更喜欢注意在这个允许的距离，在更改字体大小的位置以修改图表大小

\documentclass{article} 
\usepackage{tikz}
\usetikzlibrary{arrows,positioning,automata,shadows,fit,shapes}


 \begin{document}


 {\tiny
 \begin{tikzpicture}[shorten >=1pt, node distance=5em ,auto,thick,initial text=,]
 \node[state, initial]            (0)                          {0};
 \node[state]                     (1)   [above right =of 0]    {1};
 \node[state]                     (2)   [right =of 0]          {2};
 \node[state,accepting]           (3)   [right =of 2]          {3};



 \path[->]      (0)  edge       node           {a:a / 1.61}   (1)
             (0)  edge       node           {b:b/ 0.22}   (2)
             (2)  edge       [loop below]  node         {b:a/ 0.69}   ()
             (2)  edge       node           {b:a/ 0.69}   (3);

 \end{tikzpicture}
 }

 {\small
 \begin{tikzpicture}[shorten >=1pt, node distance=5em ,auto,thick,initial text=,]
 \node[state, initial]            (0)                          {0};
 \node[state]                     (1)   [above right =of 0]    {1};
 \node[state]                     (2)   [right =of 0]          {2};
 \node[state,accepting]           (3)   [right =of 2]          {3};



 \path[->]      (0)  edge       node           {a:a / 1.61}   (1)
             (0)  edge       node           {b:b/ 0.22}   (2)
             (2)  edge       [loop below]  node         {b:a/ 0.69}   ()
             (2)  edge       node           {b:a/ 0.69}   (3);

 \end{tikzpicture}
 }

 {\Large
  \begin{tikzpicture}[shorten >=1pt, node distance=5em ,  auto,thick,initial text=,]
 \node[state, initial]            (0)                          {0};
 \node[state]                     (1)   [above right =of 0]    {1};
 \node[state]                     (2)   [right =of 0]          {2};
 \node[state,accepting]           (3)   [right =of 2]          {3};



 \path[->]      (0)  edge       node           {a:a / 1.61}   (1)
             (0)  edge       node           {b:b/ 0.22}   (2)
             (2)  edge       [loop below]  node         {b:a/ 0.69}   ()
             (2)  edge       node           {b:a/ 0.69}   (3);

 \end{tikzpicture}
 }


\end{document}