在 tikz 中排版进出平面的矢量的简单方法

Question

有没有办法轻松实现这个结果？类似于维基百科推荐的符号，但矢量的点更大。

是否有可能做到这一点\tikzset，我正在尝试类似

\tikzset{mystyle/.style={draw, circle}}
    \node[mystyle] (nodename) {} ;

但是这只画了一个圆圈...我很惊讶没有发现任何东西，所以也许这是一个可能的重复。

Answer 1

是的。一种选择是使用pics。

\documentclass[tikz,border=3.14mm]{standalone}
\begin{document}

\tikzset{
   pics/.cd,
   vector out/.style={
      code={
         \draw[#1] (0,0)  circle (1) (45:1) -- (225:1) (135:1) -- (315:1);
      }%end code   
   }%end style
}%end tikzset
\tikzset{
   pics/.cd,
   vector in/.style={
      code={
        \draw[#1] (0,0)  circle (1);
        \fill[#1] (0,0)  circle (.1);
      }%end code   
   }%end style
}%end tikzset
\begin{tikzpicture}%
\path (0,0)  pic {vector out={line width=1.5pt}} (3,0)  pic {vector in={line
width=1.5pt}};
\end{tikzpicture}

\end{document}

编辑：具有相对线宽：

\documentclass[tikz,border=3.14mm]{standalone}
\begin{document}

\tikzset{
   pics/.cd,
   vector out/.style args={#1/#2}{
      code={
         \draw[#1] (0,0)  circle (1);
         \draw[#2] (45:1) -- (225:1) (135:1) -- (315:1);
      }%end code   
   }%end style
}%end tikzset
\tikzset{
   pics/vector in/.style args={#1/#2/#3}{
      code={
        \draw[line width=#1] (0,0)  circle (1);
        \fill[#2] (0,0)  circle (#3);
      }%end code   
   }%end style
}%end tikzset
\begin{tikzpicture}%
\path (0,0)  pic {vector out={line width=3pt/line width=2pt}} (3,0)  
pic {vector in=1.5pt/blue/.2};

\end{tikzpicture}

\end{document}

Answer 2

Apath picture是另一种选择，或者说是灵活性较差的 plonking \odotand \otimesin选项node contents。

\documentclass[12pt,twoside]{article}
\usepackage{tikz}
\tikzset{
odot/.style={
  circle,
  inner sep=0pt,
  node contents={$\odot$},
  scale=2
},
otimes/.style={
  circle,
  inner sep=0pt,
  node contents={$\otimes$},
  scale=2
},
circ/.style={
  circle,
  draw,
  minimum size=5mm,
  inner sep=0
},
odot2/.style={
  circ,
  path picture={\fill circle[radius=2pt];}
},
otimes2/.style={
  circ,
  path picture={
   \draw (path picture bounding box.45) -- (path picture bounding box.225);
   \draw (path picture bounding box.135) -- (path picture bounding box.315);
  }
}
}
\begin{document}
\begin{tikzpicture}
\node [odot,name=o1];
\node [otimes,name=o2,at={(1,0)}];
\node [odot2] at (2,0) {};
\node [otimes2] at (3,0) {};
\end{tikzpicture}
\end{document}