或者 ...

Question

我正在尝试将标签（A、B、C...）放置在子图的左上角。我尝试使用 caption/subcaption 包并定义负跳过，例如\captionsetup[sub]{skip=-5pt}，但标签排版在图形下方。这是我现在得到的结果：

\documentclass{article}
\usepackage{graphicx}
\usepackage{xcolor}

\usepackage{caption}
\usepackage{subcaption}
    \captionsetup[sub]{labelfont=bf, position=top, 
          singlelinecheck=false, labelformat=simple, skip=-5pt}
    \renewcommand\thesubfigure{\Alph{subfigure}}

\begin{document}

\begin{figure}
    \centering
    \begin{subfigure}{.45\linewidth}
        \caption{}\label{fig:1a}
        \textcolor{gray}{\rule{5cm}{3cm}}
    \end{subfigure}
    \begin{subfigure}{.45\linewidth}
        \caption{}\label{fig:1b}
        \textcolor{gray}{\rule{5cm}{3cm}}
    \end{subfigure}
    \caption{This is Figure 1.}\label{fig:1}
\end{figure}

\end{document}

如您所见，A 和 B 隐藏在灰色框后面，但我想将它们渲染到顶部。 期望的结果如下：

使 z 顺序正确的最优雅的解决方案是什么？

Answer 1

虽然有点过度，但您可以使用 TikZ 以及\phantomsubcaption和\subref来做到这一点：

\documentclass{article}
\usepackage{tikz} % loads graphicx and xcolor

\usepackage{caption}
\usepackage{subcaption}
\renewcommand\thesubfigure{\Alph{subfigure}}

\begin{document}

\begin{figure}
  \centering
  {\phantomsubcaption\label{fig:1a}}
  {\phantomsubcaption\label{fig:1b}}
  \tikz\node[inner sep=0pt,label={[anchor=north west]north west:\subref{fig:1a}}] {\textcolor{gray}{\rule{5cm}{3cm}}};
  \tikz\node[inner sep=0pt,label={[anchor=north west]north west:\subref{fig:1b}}] {\textcolor{gray}{\rule{5cm}{3cm}}};

  \caption{This is Figure 1.}\label{fig:1}
\end{figure}
\end{document}

或者 ...

很好的旧picture模式。

\documentclass{article}
\usepackage{graphicx}
\usepackage{xcolor}

\usepackage{caption}
\usepackage{subcaption}
\renewcommand\thesubfigure{\Alph{subfigure}}

\begin{document}

\begin{figure}
  \centering
  \setlength\unitlength{1cm}
  {\phantomsubcaption\label{fig:1a}}
  {\phantomsubcaption\label{fig:1b}}

\textcolor{gray}{\rule{5cm}{3cm}}%
\begin{picture}(0,0)
\put(-4.8,2.6){\subref{fig:1a}}
\end{picture}
\textcolor{gray}{\rule{5cm}{3cm}}%
\begin{picture}(0,0)
\put(-4.8,2.6){\subref{fig:1b}}
\end{picture}

\caption{This is Figure 1.}\label{fig:1}
\end{figure}
\end{document}