子图没有对齐

Question

下面我有 4 个子图，但是如果第三个子图文本超过一行，我就会遇到一个问题，第 4 个图会向下移动一点，如下所示。不知道如何解决这个问题？

\documentclass[conference]{IEEEtran}
\IEEEoverridecommandlockouts
% The preceding line is only needed to identify funding in the first footnote. If that is unneeded, please comment it out.
\usepackage{cite}
\usepackage{caption}
\usepackage{subcaption}
\usepackage{amsmath,amssymb,amsfonts}
\usepackage{algorithmic}
\usepackage{graphicx}
\usepackage{textcomp}
\usepackage{xcolor}
\usepackage{tabularx}
\def\BibTeX{{\rm B\kern-.05em{\sc i\kern-.025em b}\kern-.08em
    T\kern-.1667em\lower.7ex\hbox{E}\kern-.125emX}}
    
\title{AlgorithmTemplate}
% \documentclass[12pt]{article}
\usepackage{fullpage}
\usepackage{times}
\usepackage{fancyhdr}
\usepackage[ruled,vlined]{algorithm2e}
\include{pythonlisting}

\begin{document}

sa

\begin{figure}
    \centering
    \begin{subfigure}[b]{0.45\linewidth}
        \centering
        \includegraphics[width=\linewidth]{testfig.png}
        \caption{a}
        \label{fig: a}
    \end{subfigure}
    \hfill
    \begin{subfigure}[b]{0.45\linewidth}
        \centering
        \includegraphics[width=\linewidth]{testfig.png}
        \caption{b  }
        \label{fig:b}
    \end{subfigure}
    \hfill
    \begin{subfigure}[b]{0.45\linewidth}
        \centering
        \includegraphics[width=\linewidth]{testfig.png}
        \caption{I have some text here that will shift the 4th figure to bottom}
        \label{fig:c}
    \end{subfigure}
    \hfill
    \begin{subfigure}[b]{0.45\linewidth}
        \centering
        \includegraphics[width=\linewidth]{testfig.png}
        \caption{d}
        \label{fig:d}
    \end{subfigure}
    \caption{d}
    \label{fig:three graphs}
\end{figure}

\end{document}

Answer 1

将每个 的底部对齐方式更改[b]为顶部对齐方式。然后，如果您想要一个 4x4 图像网格，请删除中间并添加一个空白区域。这会将其他 2 个数字移动到下一行。您可能需要增加垂直间距。因此，使用任意长度 sa等或。[t]\subfigure\hfill\vspace{...}12pt1cm\bigskip

\documentclass[conference]{IEEEtran}
\IEEEoverridecommandlockouts
% The preceding line is only needed to identify funding in the first footnote. If that is unneeded, please comment it out.
\usepackage{cite}
\usepackage{caption}
\usepackage{subcaption}
\usepackage{amsmath,amssymb,amsfonts}
\usepackage{algorithmic}
\usepackage{graphicx}
\usepackage{textcomp}
\usepackage{xcolor}
\usepackage{tabularx}
\def\BibTeX{{\rm B\kern-.05em{\sc i\kern-.025em b}\kern-.08em
    T\kern-.1667em\lower.7ex\hbox{E}\kern-.125emX}}
    
\title{AlgorithmTemplate}
% \documentclass[12pt]{article}
\usepackage{fullpage}
\usepackage{times}
\usepackage{fancyhdr}
\usepackage[ruled,vlined]{algorithm2e}
\include{pythonlisting}

\usepackage{kantlipsum}

\begin{document}
\kant[1]

\begin{figure}[tbh]
    \centering
    \begin{subfigure}[t]{0.45\linewidth}
        \centering
        \includegraphics[width=\linewidth]{example-image}
        \caption{a}
        \label{fig: a}
    \end{subfigure}%
    \hfill%
    \begin{subfigure}[t]{0.45\linewidth}
        \centering
        \includegraphics[width=\linewidth]{example-image}
        \caption{b  }
        \label{fig:b}
    \end{subfigure}
    
    \bigskip%
    
    \begin{subfigure}[t]{0.45\linewidth}
        \centering
        \includegraphics[width=\linewidth]{example-image}
        \caption{I have some text here that will shift the 4th figure to bottom}
        \label{fig:c}
    \end{subfigure}%
    \hfill%
    \begin{subfigure}[t]{0.45\linewidth}
        \centering
        \includegraphics[width=\linewidth]{example-image}
        \caption{d}
        \label{fig:d}
    \end{subfigure}
    \caption{Main}
    \label{fig:three graphs}
\end{figure}

\kant[2-4]
\end{document}