Customize the subcaption caption text

captionssubcaption

Can you assist me in customizing the subcaption text parameters? Parameters originally derived from a caption environment:

Here is the caption parameters:

%%% Caption Formatting
%
% This modifies the default LaTeX format for figure and table captions.
%   Single-line captions are set centered under the figure.
%   Multi-line captions are set centered in a paragraph of width \capwidth.
%
\long\def\@makecaption#1#2{%
    \vskip\abovecaptionskip
    \sbox\@tempboxa{\small{\bfseries #1\/}: #2}%
    \ifdim \wd\@tempboxa > \capwidth
        \@tempdima=\textwidth%
        \advance\@tempdima by -\capwidth%
        \advance\leftskip by 0.5\@tempdima%
        \advance\rightskip by 0.5\@tempdima%
        \singlespacing
        {\bfseries #1\/}: #2\par
    \else
        \hbox to\hsize{\hfil\box\@tempboxa\hfil}%
    \fi
    \vskip\belowcaptionskip}

Here is my full code:

\documentclass[12pt]{article}

%======================================================================================
%  ADDITIONS
%======================================================================================
% For Tables
\usepackage[table]{xcolor}
\usepackage{bigstrut}

\usepackage{graphicx}
\usepackage{eso-pic}
\usepackage{amsmath,amssymb,amsfonts,bm,mathtools}

%####################     FOR FIGURES        ################
\usepackage{caption}
\usepackage[skip=0.5ex]{subcaption}

%---------------- show page layout. don't use in a real document!
\usepackage{showframe}
\renewcommand\ShowFrameLinethickness{0.15pt}
\renewcommand*\ShowFrameColor{\color{red}}
%---------------------------------------------------------------%
\usepackage{lipsum}
\usepackage{booktabs}
\linespread{1.5}
%%% Caption Formatting
%
% This modifies the default LaTeX format for figure and table captions.
%   Single-line captions are set centered under the figure.
%   Multi-line captions are set centered in a paragraph of width \capwidth.
%
\long\def\@makecaption#1#2{%
    \vskip\abovecaptionskip
    \sbox\@tempboxa{\small{\bfseries #1\/}: #2}%
    \ifdim \wd\@tempboxa > \capwidth
        \@tempdima=\textwidth%
        \advance\@tempdima by -\capwidth%
        \advance\leftskip by 0.5\@tempdima%
        \advance\rightskip by 0.5\@tempdima%
        \singlespacing
        {\bfseries #1\/}: #2\par
    \else
        \hbox to\hsize{\hfil\box\@tempboxa\hfil}%
    \fi
    \vskip\belowcaptionskip}
%
% The default \capwidth is 80% of the \textwidth.
%
\newlength{\capwidth}
\setlength{\capwidth}{0.8\textwidth}

\begin{document}

\begin{figure}
    \centering
    \setkeys{Gin}{width=\linewidth}
\begin{subfigure}[b]{0.3\linewidth}
     \includegraphics{example-image-a}
     \caption{A \& B sites}
     \label{fig:y equals x}
\end{subfigure}
\hfil
\begin{subfigure}[b]{0.3\linewidth}
     \includegraphics{example-image-b}
     \caption{C \& D sites}
     \label{fig:three sin x}
\end{subfigure}
    \caption{Uranium Concentrations at soil locations}
    \label{fig:uranium}
    \end{figure}


    \lipsum[3]
\begin{figure}[!b]
    \centering
    \begin{subfigure}{0.49\linewidth}
        \includegraphics[scale=0.5]{example-image}
        \subcaption{$Q^{*}$ values for arm 1}
        \label{fig:arm1}
    \end{subfigure}
    \hfil
\begin{subfigure}[b]{0.49\linewidth}
     \includegraphics[scale=0.5]{example-image-b}
     \subcaption{C \& D sites}
     \label{fig:three sin x}
\end{subfigure}

\medskip
    \begin{subfigure}{0.35\textwidth}
        \includegraphics[width=\linewidth]{example-image}
        \subcaption{$Q^{*}$ values for arm 2}
        \label{fig:arm2}
    \end{subfigure}
    \caption{$Q^{*}$ values for different arms which will extend to a very long caption title if I continue to type like this.}
\end{figure}%
\begin{figure}[ht]\ContinuedFloat
    \centering
    \begin{subfigure}{0.6\textwidth}
        \includegraphics[width=\linewidth]{example-image}
        \subcaption{$Q^{*}$ values for arm 3}
        \label{fig:arm3}
    \end{subfigure}

\medskip
    \begin{subfigure}{0.6\textwidth}
        \includegraphics[width=\linewidth]{example-image}
        \subcaption{$Q^{*}$ values for arm 4}
        \label{fig:arm4}
    \end{subfigure}
    \caption[]{$Q^{*}$ values for different arms (cont.)}
    \label{fig:arms}
\end{figure}
    \lipsum[2-3]
    
\end{document}

Best Answer

You can set the margin and the justification using of the captions using \captionsetup

\captionsetup{ margin = \capmargin, justification=centering} where \capmargin value is the desired margins.

\documentclass[12pt]{article}

%======================================================================================
%  ADDITIONS
%======================================================================================
% For Tables
\usepackage[table]{xcolor}
\usepackage{bigstrut}

\usepackage{graphicx}
\usepackage{eso-pic}
\usepackage{amsmath,amssymb,amsfonts,bm,mathtools}

%####################     FOR FIGURES        ################
%\usepackage{caption} % not needed <<<<<<<<<<<<<<<
\usepackage[skip=0.5ex]{subcaption}

%---------------- show page layout. don't use in a real document!
\usepackage{showframe}
\renewcommand\ShowFrameLinethickness{0.15pt}
\renewcommand*\ShowFrameColor{\color{red}}
%---------------------------------------------------------------%
\usepackage{lipsum}
\usepackage{booktabs}
\linespread{1.5}
%%% Caption Formatting
%
% This modifies the default LaTeX format for figure and table captions.
%   Single-line captions are set centered under the figure.
%   Multi-line captions are set centered in a paragraph of width \textwidth - 2\capmargin

\newlength{\capmargin} % added <<<<<<<<<<<<<
\setlength{\capmargin}{0.1\textwidth} % added <<<<<<<<<<<<<
\captionsetup{ margin = \capmargin, justification=centering} % added <<<<<<<<<<<<<

\begin{document}
    
    \begin{figure}[htp!]
        \centering
        \setkeys{Gin}{width=\linewidth}
        \begin{subfigure}[b]{0.3\linewidth}
            \includegraphics{example-image-a}
            \caption{A \& B sites}
            \label{fig:y equals x}
        \end{subfigure}
        \hfil
        \begin{subfigure}[b]{0.3\linewidth}
            \includegraphics{example-image-a}
            \caption{C \& D sites}
            \label{fig:three sin x}
        \end{subfigure}
        \caption{Uranium Concentrations at soil locations}
        \label{fig:uranium}
    \end{figure}
        
    \lipsum[3]
    \begin{figure}[!b]
        \centering
        \begin{subfigure}{0.49\linewidth}
            \includegraphics[scale=0.5]{example-image-b}
            \subcaption{$Q^{*}$ values for arm 1}
            \label{fig:arm1}
        \end{subfigure}
        \hfil
        \begin{subfigure}[b]{0.49\linewidth}
            \includegraphics[scale=0.5]{example-image-b}
            \subcaption{C \& D sites}
            \label{fig:three sin x}
        \end{subfigure}
        
        \medskip
        \begin{subfigure}{0.35\textwidth}
            \includegraphics[width=\linewidth]{example-image-b}
            \subcaption{$Q^{*}$ values for arm 2}
            \label{fig:arm2}
        \end{subfigure}
        \caption{$Q^{*}$ values for different arms which will extend to a very long caption title if I continue to type like this.}
    \end{figure}%
    \begin{figure}[ht]\ContinuedFloat
        \centering
        \begin{subfigure}{0.6\textwidth}
            \includegraphics[width=\linewidth]{example-image-c}
            \subcaption{$Q^{*}$ values for arm 3}
            \label{fig:arm3}
        \end{subfigure}
        
        \medskip
        \begin{subfigure}{0.6\textwidth}
            \includegraphics[width=\linewidth]{example-image-c}
            \subcaption{$Q^{*}$ values for arm 4}
            \label{fig:arm4}
        \end{subfigure}
        \caption[]{$Q^{*}$ values for different arms (cont.)}
        \label{fig:arms}
    \end{figure}
    \lipsum[2-3]
    
\end{document}

You might want to customize the caption figures and the caption subfigures separately. For example

\captionsetup[figure]{margin = \capmargin, justification=centering, labelfont=bf} % added <<<<<<<<<<<<<
\captionsetup[sub]{ justification=centering, labelfont=rm}

will use the bold font for the label of the figure.

UPDATE After follow-up question: changing the line spacing in the caption.

(1) Load the package setspace

(2) Use font={stretch=1} in the captionsetup for figures.

\usepackage{setspace} % added <<<<<<<<<<<<<
\newlength{\capmargin} % added <<<<<<<<<<<<<
\setlength{\capmargin}{0.1\textwidth} % added <<<<<<<<<<<<<
\captionsetup[figure]{margin = \capmargin, justification=centering, labelfont=bf,font={stretch=1.2}} % added <<<<<<<<<<<<<
\captionsetup[sub]{ justification=centering, labelfont=rm}% added

Related Solutions

[Tex/LaTex] How to caption/subcaption a tabular? easily

Repeating the suggestions provided in the comments: Place the existing tabular environment inside a table environment. It is common -- though not mandatory -- to center the material inside a table environment. The command \centering achieves that objective. The table and figure environments are "floats", i.e., unless you explicitly instruct LaTeX not to do so, LaTeX will place them where it thinks it's best. For much more on floats and the LaTeX algorithm that determines float placement, see the posting How to influence the position of float environments like figure and table in LaTeX?

The table environment can be given a \caption and a \label. Assigning labels is useful if you want to cross-reference the table somewhere else in your document using the TeX/LaTeX command \ref.

If you do a lot of cross-referencing -- not only to tables, but to sections, figures, page numbers, etc -- you may want to get to know the cleveref package and its command \cref. For more on LaTeX's cross-referencing mechanisms and packages that provide enhanced cross-referencing macros see the posting Cross-reference packages: which to use, which conflict?

Here, finally, is your tabular environment encased in a table environment, with a couple of cross-referencing commands thrown in for good measure.

enter image description here

\documentclass[12pt,a4paper,x11names]{article}
\usepackage[vmargin=2.5cm, left=3.5cm, right=2.5cm] {geometry}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage[spanish]{babel}
\usepackage[spanish]{cleveref} %% new

\begin{document}
Hello, \dots

\begin{table}[h]  %% new
\centering        %% new
\caption{A simple table} %% new
\label{tab:simple}       %% new
\begin{tabular}{|c|c|r|}
  \hline
  % after \\: \hline or \cline{col1-col2} \cline{col3-col4} ...
  a & e & 12 \\
  \hline
  f & g & 3 \\
  \hline
\end{tabular}
\end{table} %% new

Here's a cross-reference to table \ref{tab:simple}.  %% new

Here's a cross-reference to \cref{tab:simple}.  %% new
\end{document}

[Tex/LaTex] Separation between caption and subcaption

It is mostly an optical effect. The vertical space is the same as the one used between figure and caption, but it is measured from the bottom, which in the case of subfigures is at the lowest point in the parentheses.

Here's the proof:

\documentclass{article}
\usepackage{caption}
\usepackage{subcaption}

\DeclareRobustCommand{\vr}[1]{\smash{\rule{0.2pt}{#1}}}
\DeclareRobustCommand{\hr}{\makebox[0pt][l]{\rule{10cm}{0.2pt}}}

\begin{document}

\begin{figure}[htp]
\centering
    \rule{6cm}{3cm}
\caption{A figure\vr{18pt}}
\end{figure}

\begin{figure}[htp]
  \begin{subfigure}[t]{.5\linewidth}
    \centering
    \rule{3cm}{3cm}
    \caption{\hr First subfigure}
  \end{subfigure}%
  \begin{subfigure}[t]{.5\linewidth}
    \centering
    \rule{3cm}{3cm}
    \caption{Second subfigure}
  \end{subfigure}

\caption{A figure\vr{18pt}}
\end{figure}
\end{document}

I added rules to show the spacing; the rule in the upper figure almost touches the black box; in the bottom case, it almost touches the level of the parentheses. Actually there is 1pt more in the bottom case, due to \lineskip.

enter image description here

If you want that the vertical spacing is measured from the baseline of the subfigures and your subcaptions are always one liners, then you might add

\AtBeginDocument{%
  \def\endsubfigure{%
    \par % ensure vertical mode
    {\small\sbox0{()}\kern-\dp0}% back up by the depth of ()
    \kern-\lineskip
    \endminipage
  }%
}

and the result would be

enter image description here

However, the backing up would be too much if a subcaption breaks across lines.

A much easier method would be

\captionsetup{skip=\dimexpr\abovecaptionskip-3pt}
\caption{A figure}

adjusting the 3pt to suit in the cases where this seems necessary. This will reduce the skip between the objects (subfigures and caption) by the stated amount.

Best Answer

Related Solutions

[Tex/LaTex] How to caption/subcaption a tabular? easily

[Tex/LaTex] Separation between caption and subcaption

Related Question