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如何在 \node[circle] 中设置 TikZ 圆半径？

tag-icon • tag-icon tikz-pgf tikz-node
如何在 \node[circle] 中设置 TikZ 圆半径？

我知道 Ti钾Z，我们可以在使用命令时指定圆的半径\draw，例如：

 \draw[fill] (1,2) circle (3pt);

但是当您通过命令绘制圆时，如何指示半径\node，如下所示？

 \node[fill,circle,label=below left:$x$] at (1,2) {};

例如，假设我想要一个半径为 3pt 的圆：

\documentclass[tikz]{standalone}
\begin{document}
\begin{tikzpicture}
   \node[fill,circle,label=below left:$x$] at (1,2) {};
\end{tikzpicture}
\end{document}

我更喜欢看到两种方法来实现这一点：一种方法仅适用于特定的（填充的）圆圈，第二种方法可以全局用于整个图片。

答案1

一个具有圆形形状的节点，其圆的半径等于minimum size/2，当然，如果您将其设置inner sep为零。节点特征可以在节点处局部定义，或tikzpicture使用选项将其定义为新样式，或者tikzset在文档的序言中全局定义。例如：

\documentclass[tikz, margin=3mm]{standalone}
\begin{document}
\begin{tikzpicture}[
dot/.style = {circle, fill, minimum size=#1,
              inner sep=0pt, outer sep=0pt},
dot/.default = 6pt  % size of the circle diameter 
                    ]  
\node[dot,label=below left:radius 3pt] at (0,0) {};
\node[dot=5pt,label=below left:radius 5pt] at (3,0) {};
\draw[red, semitransparent] (0,0) circle[radius=3pt];% test of the radius size
\end{tikzpicture}
\end{document}

或者

\documentclass[tikz, margin=3mm]{standalone}
\tikzset{
dot/.style = {circle, fill, minimum size=#1,
              inner sep=0pt, outer sep=0pt},
dot/.default = 6pt % size of the circle diameter 
}
\begin{document}
\begin{tikzpicture}                   ]  
\node[dot,label=below left:radius 3pt] at (0,0) {};
\node[dot=10pt,label=below left:radius 5pt] at (3,0) {};
\draw[red, semitransparent] (0,0) circle[radius=3pt];% test of the radius size
\end{tikzpicture}
\end{document}

在此处输入图片描述

答案2

有趣的是，这里是对命令的测试，根据我的发现，文本节点中形状的尺寸（在本例中为圆形）取决于 + text_node_content_shape_dimmension；the_internal_separation (inner sep)因为它将自己定义为minimum size，所以只有当文本的尺寸 + 内部分隔小于 时，它才会定义大小minimum size；这样，如果我们想确保形状的尺寸由 决定the minimum size，则必须从对应于文本的值中减去内部分隔的值，以使两个总和都低于minimun size。

结果：多个选项结果可查看控件如何控制形状大小，即使它包含文本。

在此处输入图片描述

梅威瑟：

\usepackage{tikz}
\usetikzlibrary{arrows.meta}

\begin{document}
    \begin{tikzpicture}[
        >={Stealth[inset=0pt,length=2pt]},
        line width=0.1pt,
        fill opacity=0.2,
        text opacity=1,
    ]
    %Grid in pt units
    \draw[black!30,step=1pt] (0,0) grid (30pt,-120pt);
    \draw[black!80,step=10pt,line width=0.2pt] (0,0) grid (30pt,-120pt);
    \draw[|-|,line width=0.2pt] (0,0)++(0,3pt)-- ++(10pt,0) node[midway](n){};
    \draw[<-] (n.center) |- ++(10pt,5pt) node [anchor=180, inner sep=0pt]{\tiny \verb+10pt+};

    %Drawing a shape
    \draw[fill]
    (15pt,-5pt)
        circle (3pt)
        ++ (15pt,0)
        node[anchor=180, font=\tiny]{\verb+\draw[fill](x,y) circle (3pt);+};
    %Drawing a node
    \draw[blue]
    (15pt,-15pt)
        node [fill,draw,circle,label=below left:$x$]{}
        ++(15pt,0)
        node[anchor=180, font=\tiny]{\verb+\node[fill,draw,circle,label=below left:$x$]at(x,y){};+};

    \draw[blue!50!cyan]
    (15pt,-25pt)
        node [fill,draw,circle,label=below left:$x$] {$x$}
        ++(15pt,0)
        node[anchor=180, font=\tiny]{\verb+\node[fill,draw,circle,label=below left:$x$]at(x,y){$x$};+};

    \draw[green!50!blue]
    (15pt,-35pt)
        node [fill,draw,circle,label=below left:$x$, inner sep=0pt] {$x$}
        ++(15pt,0)
        node[anchor=180, font=\tiny]{\verb+\node[fill,draw,circle,label=below left:$x$,inner sep=0pt]at(x,y){$x$};+};

    \draw[green!50!black]
    (15pt,-45pt)
        node [fill,draw,circle,label=below left:$h$, inner sep=0pt] {$h$}
        ++(15pt,0)
        node[anchor=180, font=\tiny]{\verb+\node[fill,draw,circle,label=below left:$h$,inner sep=0pt]at(x,y){$h$};+};

    \draw[green!50!orange]
    (15pt,-55pt)
        node [fill,draw,circle,label=below left:$h$,inner sep=-1pt] {$h$}
        ++(15pt,0)
        node[anchor=180, font=\tiny]{\verb+\node[fill,draw,circle,label=below left:$h$,inner sep=-1pt]at(x,y){$h$};+};

    \draw[orange]
    (15pt,-65pt)
        node [fill,draw,circle,label=below left:$h$,minimum size=6pt] {$h$}
        ++(15pt,0)
        node[anchor=180, font=\tiny]{\verb+\node[fill,draw,circle,label=below left:$h$,minimum size=6pt]at(x,y){$h$};+};

    \draw[red]
    (15pt,-75pt)
        node [fill,draw,circle,label=below left:$h$,minimum size=6pt, inner sep=0pt] {$h$}
        ++(15pt,0)
        node[anchor=180, font=\tiny]{\verb+\node[fill,draw,circle,label=below left:$h$,minimum size=6pt,inner sep=0pt]at(x,y){$h$};+};

    \draw[red!50!black]
    (15pt,-85pt)
        node [fill,draw,circle,label=below left:$h$, inner sep=-2] {$h$}
        ++(15pt,0)
        node[anchor=180, font=\tiny]{\verb+\node[fill,draw,circle,label=below left:$h$,inner sep=-2]at(x,y){$h$};+};

    \draw[blue!50!black]
    (15pt,-95pt)
        node [fill,draw,circle,label=below left:$h$,minimum size=6, inner sep=-2] {$h$}
        ++(15pt,0)
        node[anchor=180, font=\tiny]{\verb+\node[fill,draw,circle,label=below left:$h$,minimum size=6,inner sep=-2]at(x,y){$h$};+};

    \draw[blue!50!purple]
    (15pt,-105pt)
        node [fill,draw,circle,label=below left:$h$,minimum size=6, inner sep=-2] {}
        ++(15pt,0)
        node[anchor=180, font=\tiny]{\verb+\node[fill,draw,circle,label=below left:$h$,minimum size=6,inner sep=-2]at(x,y){};+};

    \draw[densely dashed]
    (12pt,0) -- ++(0,-125pt)
    (18pt,0) -- ++(0,-125pt);
    \draw[|-|,line width=0.2pt] (0,-120pt)++(12pt,-4pt)-- ++(6pt,0) node[midway](n){};
    \draw[<-] (n.center) |- ++(10pt,-5pt) node [anchor=180, inner sep=0pt]{\tiny \verb+6pt+};

    \end{tikzpicture}

\end{document}

附录：

  • 结果比例为 3.5；
  • 在代码中我使用：\draw[draw_style_opt](coordinate) node[node_style_opt]{node_text_content};而不是\node[node_style_opt] at (coordinate) {node_text_content};因为draw_style_opt会影响命令行内的所有样式。

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