Tikz 里面有字母时圆的直径是多少？

Question

我有以下 tikz 代码：

\tikzstyle{city} = [draw, fill=white!20, circle, node distance=0.5cm]

\begin{tikzpicture}[baseline={(current bounding box.center)},node distance=0.7cm]
\node [city] (S) {};
\node [coordinate,right of=city] (S1) {};
\node [city,above of=S1] (j1) {$j$};
\node [city,above of=j1] (i1) {};
\node [city,below of=S1] (k1) {};
\end{tikzpicture}

输出结果如下：

我怎样才能使包含它的圆j与其他圆的直径相同并且不会像那样爆炸？

谢谢你！

Answer 1

您可以使用label={...}代替节点文本，使节点大小独立于文本大小。

\documentclass[12pt]{article}
\usepackage{tikz}
\begin{document}

\tikzstyle{city} = [draw, fill=white!20, circle, node distance=0.5cm]

\begin{tikzpicture}[baseline={(current bounding box.center)},node distance=0.7cm]
\node [city] (S) {};
\node [coordinate,right of=S] (S1) {};
\node [city,above of=S1, label=center:$j$] (j1) {};
\node [city,above of=j1] (i1) {};
\node [city,below of=S1] (k1) {};
\end{tikzpicture}

\bigskip

\tikzstyle{city} = [draw, fill=white!20, circle,minimum size=1.1em, node distance=0.5cm]

\begin{tikzpicture}[baseline={(current bounding box.center)},node distance=0.7cm]
\node [city] (S) {};
\node [coordinate,right of=S] (S1) {};
\node [city,above of=S1, label=center:$j$] (j1) {};
\node [city,above of=j1] (i1) {};
\node [city,below of=S1] (k1) {};
\end{tikzpicture}

\end{document}

如果圆圈对于文本来说太紧，您可以通过设置来使所有圆圈的尺寸稍微大一些minimum size=1.1em。