Alineación de figuras usando subtítulos

Question

Estoy tratando de alinear algunas figuras usando elsubtítulopaquete.

Mi código actual es ese:

\documentclass[11pt,twocolumn]{article}

\usepackage[demo]{graphicx}
\usepackage{subcaption}
\usepackage{caption}

\begin{document}

    \begin{figure}[htpb]
        \subcaptionbox{}
            {\includegraphics[width=0.48\columnwidth]{figs/Fig_a}} \hspace{.5em}
        {\includegraphics[width=0.2\columnwidth]{figs/legend} phantomsubcaption}
        \subcaptionbox{}
            {\includegraphics[width=0.48\columnwidth]{figs/Fig_b}} \hfill
        \subcaptionbox{}
            {\includegraphics[width=0.48\columnwidth]{figs/Fig_c}} 
        \caption{}
    \end{figure}

\end{document}

Que produce:

Sin embargo, me gustaría que la primera imagen quedara alineada. Intenté usar esto:

\usepackage[export]{adjust box}
\captionsetup{justification=raggedright, singlelinecheck=false}

\begin{figure}[htpb]
    \subcaptionbox{}
        {\includegraphics[width=0.48\columnwidth, left]{figs/Fig_a}} \hspace{.5em}
    {\includegraphics[width=0.2\columnwidth]{figs/legend} phantomsubcaption}
    \subcaptionbox{}
        {\includegraphics[width=0.48\columnwidth]{figs/Fig_b}} \hfill
    \subcaptionbox{}
        {\includegraphics[width=0.48\columnwidth]{figs/Fig_c}} 
    \caption{}
\end{figure}

Sin éxito:

Además, la imagen con el\phantomsubcaptionno tiene la misma altura que la Figura (a) y me gustaría que estuviera alineado verticalmente en el centro, y no abajo ni arriba, es decir, alineado con el centro de la Figura (a). ¿Es eso posible?

Gracias.

Answer 1

¿Es esto lo que quieres? Simplemente coloque la figura estrecha en el primero \subcaptionbox.

\documentclass[11pt,twocolumn]{article}

\usepackage[demo]{graphicx}
\usepackage{subcaption}
\usepackage{caption}

\begin{document}

\begin{figure}[htpb]
\centering
\subcaptionbox{}{%
  \includegraphics[width=0.48\columnwidth]{figs/Fig_a}%
  \hspace{0.04\columnwidth}%
  \includegraphics[width=0.2\columnwidth]{figs/legend}}\hspace*{\fill}

\subcaptionbox{}{\includegraphics[width=0.48\columnwidth]{figs/Fig_b}}\hfill
\subcaptionbox{}{\includegraphics[width=0.48\columnwidth]{figs/Fig_c}}

\caption{Some caption or this wouldn't make much sense}

\end{figure}

\end{document}

Si desea que (a) quede centrado con respecto a la imagen ancha, puede insertar la imagen estrecha en un cuadro de ancho cero:

\documentclass[11pt,twocolumn]{article}

\usepackage[demo]{graphicx}
\usepackage{subcaption}
\usepackage{caption}

\begin{document}

\begin{figure}[htpb]
\centering
\subcaptionbox{}{%
  \includegraphics[width=0.48\columnwidth]{figs/Fig_a}%
  \makebox[0pt][l]{%
    \hspace{0.04\columnwidth}%
    \includegraphics[width=0.2\columnwidth]{figs/legend}%
  }%
}\hspace*{\fill}

\subcaptionbox{}{\includegraphics[width=0.48\columnwidth]{figs/Fig_b}}\hfill
\subcaptionbox{}{\includegraphics[width=0.48\columnwidth]{figs/Fig_c}} 

\caption{Some caption or this wouldn't make much sense}

\end{figure}

\end{document}

Si desea subtítulos alineados a la izquierda, indíquelo a caption:

\documentclass[11pt,twocolumn]{article}

\usepackage[demo]{graphicx}
\usepackage{subcaption}
\usepackage{caption}

\begin{document}

\begin{figure}[htpb]
\captionsetup[subfigure]{singlelinecheck=false}
\centering
\subcaptionbox{}{%
  \includegraphics[width=0.48\columnwidth]{figs/Fig_a}%
    \hspace{0.04\columnwidth}%
    \includegraphics[width=0.2\columnwidth]{figs/legend}%
}\hspace*{\fill}

\subcaptionbox{}{\includegraphics[width=0.48\columnwidth]{figs/Fig_b}}\hfill
\subcaptionbox{}{\includegraphics[width=0.48\columnwidth]{figs/Fig_c}} 

\caption{Some caption or this wouldn't make much sense}

\end{figure}

\end{document}

También puede \captionsetup[subfigure]{singlelinecheck=false}ir en el preámbulo, por lo que afectará a todos los subtítulos.