请参阅下面我的代码
\noindent\makebox[\textwidth]{%
\tikzstyle{every node}=[circle, draw, fill=black!100,
inner sep=0pt, minimum width=5pt]
\begin{tikzpicture}[thick,scale=0.8]%
%1st column
\draw(0,0)node[label={[yshift=-0.4cm, xshift=0.1cm]90:{}}](1){};
\draw(0,5)node[label={[yshift=0.4cm, xshift=0.1cm]270:{}}](2){};
\draw(5,5)node[label={[yshift=-0.4cm, xshift=-0.1cm]90:{}}](3){};
\draw(5,0)node[label={[yshift=-0.9cm, xshift=-0.9cm]:{}}](4){};
%1st column
\draw(1)--(2);
\draw(2)--(3);
\draw(3)--(4);
\draw(4)--(1);
\end{tikzpicture}
}\captionsetup{justification=centering}
{\captionof{figure}{This figure shows a cycle of length $4$.
\\Note: I need to make a note here. Thus, this is a very very very long caption. However, it looks weird being center-justified as the sentences differ in length especiallyWhenThereAreLongWords like this. How can I make it center-justified and all lines have an equal length with the first line.}}
我附上了当前输出。我们可以像所需的标题 1 或 2 那样对其进行编码吗？谢谢！！
答案1
像这样：
（红线表示文本区域左右边界）
对于这样的标题和节点形成，您需要测量标题宽度，然后设置标题宽度：
\documentclass{article}
\usepackage{caption} % new
\newsavebox\capbox
\newlength\capwidth
\usepackage{tikz} % new
\usetikzlibrary{shapes.geometric} % new
%---------------- Show page layout. Don't use in a real document!
\usepackage{showframe}
\renewcommand\ShowFrameLinethickness{0.15pt}
\renewcommand*\ShowFrameColor{\color{red}}
%---------------------------------------------------------------%
\begin{document}
\begin{figure}
\centering
\begin{tikzpicture}[
box/.style = {regular polygon, regular polygon sides=4,
draw, minimum size=5cm},
dot/.style = {circle, fill,
inner sep=0pt, minimum size=4pt}
]
\node (box) [box] {};
\foreach \i in {1,2,3,4}
\node[dot] at (box.corner \i) {};
\end{tikzpicture}
\savebox\capbox{This figure shows a cycle of length $4$.}
\setlength\capwidth{\dimexpr\wd\capbox+4em}
\captionsetup{width=\capwidth}
\caption{\usebox{\capbox}}
\caption*{Note: I need to make a note here. Thus, this is a very very very long caption. However, it looks weird being center-justified as the sentences differ in length especiallyWhenThereAreLongWords like this. How can I make it center-justified and all lines have an equal length with the first line.}
\end{figure}
\end{document}
正如您所看到的，我改变了绘制正方形的方式。
附录（1）：
我无法弄清楚您的“发送”示例中的问题是什么。从显示的图像可以看出，您不需要做任何特殊的事情：
\documentclass{article}
\usepackage{caption}
\usepackage{tikz}
\usetikzlibrary{shapes.geometric} % new
\begin{document}
\begin{figure}
\centering
\begin{tikzpicture}[
box/.style = {regular polygon, regular polygon sides=4,
draw, minimum size=5cm},
dot/.style = {circle, fill,
inner sep=0pt, minimum size=4pt}
]
\node (box) [box] {};
\foreach \i in {1,2,3,4}
\node[dot] at (box.corner \i) {};
\end{tikzpicture}
\caption{This figure shows a cycle of length $4$.}
\caption*{Note: I need to make a note here. Thus, this is a very very very long caption. However, it looks weird being center-justified as the sentences differ in length especiallyWhenThereAreLongWords like this. How can I make it center-justified and all lines have an equal length with the first line.}
\end{figure}
\end{document}
附录（2）：
我猜现在你喜欢在单行标题的情况下将标题居中，但在多行情况下应该只将标题中的最后一行文本居中。如果我没记错的话，那么在caption包的序言加载中，就像上面两个示例一样：
\usepackage{microtype}
\usepackage[justification=centerlast]{caption}
比起以下的 MWE，现在两种情况的所需字幕格式都是：
\documentclass{article}
\usepackage{microtype} % new
\usepackage[justification=centerlast]{caption} % Changed
\newsavebox\capbox
\newlength\capwidth
\usepackage{tikz}
\usetikzlibrary{shapes.geometric}
\begin{document}
\begin{figure}
\centering
\begin{tikzpicture}[
box/.style = {regular polygon, regular polygon sides=4,
draw, minimum size=5cm},
dot/.style = {circle, fill,
inner sep=0pt, minimum size=4pt}
]
\node (box) [box] {};
\foreach \i in {1,2,3,4}
\node[dot] at (box.corner \i) {};
\end{tikzpicture}
\savebox\capbox{This figure shows a cycle of length $4$.}
\setlength\capwidth{\dimexpr\wd\capbox+4em}
\captionsetup{width=\capwidth}
\caption{\usebox{\capbox}}
\caption*{Note: I need to make a note here. Thus, this is a very very very long caption. However, it looks weird being center-justified as the sentences differ in length especiallyWhenThereAreLongWords like this. How can I make it center-justified and all lines have an equal length with the first line.}
\end{figure}
\begin{figure}
\centering
\begin{tikzpicture}[
box/.style = {regular polygon, regular polygon sides=4,
draw, minimum size=5cm},
dot/.style = {circle, fill,
inner sep=0pt, minimum size=4pt}
]
\node (box) [box] {};
\foreach \i in {1,2,3,4}
\node[dot] at (box.corner \i) {};
\end{tikzpicture}
\caption{This figure shows a cycle of length $4$.}
\caption*{Note: I need to make a note here. Thus, this is a very very very long caption. However, it looks weird being center-justified as the sentences differ in length especiallyWhenThereAreLongWords like this. How can I make it center-justified and all lines have an equal length with the first line.}
\end{figure}
\end{document}
答案2
对于您第二喜欢的输出，您只需添加带星号的标题和 raggedright 即可，如下所示：
\caption*{\raggedright Note: Really long note...}