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I have a tikzpicture with 2 nodes. One node is image and other node is axis label. I want to center the caption with respect to image node, rather than on the complete tikzpicture. Please help and below is my latex,

\begin{figure}
  \begin{minipage}[b]{0.5\textwidth}
    \centering
    \begin{tikzpicture}
      \node (image) at (0,0) {\includegraphics {}}
      \node (ylabel) at (-3.25,0) {$\frac{test}{test}$}
    \end{tikzpicture}
    \captionsetup{type=figure,font=footnotesize}
    \captionof{figure}{This is some junk text as caption for figure 1}
  \end{minipage}

  \begin{minipage}[b]{0.5\textwidth}
    \centering
    \begin{tikzpicture}
      \node (image) at (0,0) {\includegraphics {}}
      \node (ylabel) at (-3.25,0) {$\frac{test}{test}$}
    \end{tikzpicture}
    \captionsetup{type=figure,font=footnotesize}
    \captionof{figure}{This is some junk text as caption for figure 2}
  \end{minipage}
\end{figure}

enter image description here

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3
  • Welcome to TeX.SE! Do I understand your problem correctly that you want to have the text Figure 3.8: This is some junk text as caption for figure 1 centered vertically and horizontally within the left image? Is the Figure 3.8: part also necessary?
    – Stefan Braun
    Jun 11, 2016 at 16:33
  • Yes you are right. Figure 3.8: This is some junk text as caption for figure 1 should be horizontally centered to the left image. I wanted the caption of Figure 3.8 and 3.9 to be vertically aligned, that's why I use minipage and it works. Hence, there is no issue with vertical alignment. For your second question, Figure 3.8 is necessary for me
    – Selva
    Jun 11, 2016 at 16:37
  • Moreover, I tried trim left but it didn't work :(
    – Selva
    Jun 11, 2016 at 16:58

2 Answers 2

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2

After the image node, add \useasboundingbox (image.south east) rectangle (image.north west);. Anything added after that will not be considered with respect to the bounding box of the tikzpicture.

To make room for the node with the fraction, I reduced the width of the minipages a bit, and added \hfill between them. Note also that as you are inside a figure environment, you do not need to use \captionof.

\documentclass{article}
\usepackage[demo]{graphicx}

\usepackage{tikz,caption}


\begin{document}
\begin{figure}
  \captionsetup{type=figure,font=footnotesize}
  \begin{minipage}[b]{0.45\textwidth}
    \centering
    \begin{tikzpicture}
      \node [inner sep=0pt] (image) at (0,0) {\includegraphics{}};
      \useasboundingbox (image.south east) rectangle (image.north west);
      \node (ylabel) at (-3.25,0) {$\frac{test}{test}$};
    \end{tikzpicture}
    \caption{This is some junk text as caption for figure 1}
  \end{minipage}\hfill
  \begin{minipage}[b]{0.45\textwidth}
    \centering
    \begin{tikzpicture}
      \node [inner sep=0pt] (image) at (0,0) {\includegraphics{}};
      \useasboundingbox (image.south east) rectangle (image.north west);
      \node (ylabel) at (-3.25,0) {$\frac{test}{test}$};
    \end{tikzpicture}
    \caption{This is some junk text as caption for figure 2}
  \end{minipage}
\end{figure}
\end{document}

enter image description here

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1
  • Thx a lot for the solution :)
    – Selva
    Jun 11, 2016 at 17:55
1

EDIT: Please have a look at Torbjørn's solution, I believe it is easier and cleaner than mine.

If you want to center the caption to the complete minipage/tikzpicture: Thats easy. Just add justification=centering to your \captionformat.

\documentclass{scrartcl}

\usepackage{graphicx}
\usepackage{tikz}
\usepackage{caption}

\begin{document}
\begin{figure}
    \begin{minipage}[b]{0.5\textwidth}
    \centering
        \begin{tikzpicture}
            \node (image) at (0,0) {\includegraphics[width=0.8\textwidth]{example-image}};
            \node (ylabel) at (-3.25,0) {$\frac{test}{test}$};
        \end{tikzpicture}
        \captionsetup{type=figure,font=footnotesize,justification=centering,format=plain}
        \captionof{figure}{This is some junk text as caption for figure 1}

        % Just for demo, you can remove these two lines
        \noindent\rule{1pt}{6pt}
        \noindent\rule{\textwidth}{1pt}
    \end{minipage}
    \begin{minipage}[b]{0.5\textwidth}
    \centering
        \begin{tikzpicture}
            \node (image) at (0,0) {\includegraphics[width=0.8\textwidth]{example-image}};
            \node (ylabel) at (-3.25,0) {$\frac{test}{test}$};
        \end{tikzpicture}
        \captionsetup{type=figure,font=footnotesize,justification=centering,format=plain}
        \captionof{figure}{This is some junk text as caption for figure 2}

        % Just for demo, you can remove these two lines
        \noindent\rule{1pt}{6pt}
        \noindent\rule{\textwidth}{1pt}

    \end{minipage}
\end{figure}
\end{document}

enter image description here

The additional lines show that the captions are centered within the minipage.

If you want to center the caption to the "real" image - the grey boxes in my example - then you have to tell the caption where your image starts and ends. This can be accomplished with the margin={<left>,<right>} parameter for \captionsetup. I've done this here for my gray boxes with margin={1cm,0.4cm}, but it might be necessary to adjust those values for your image.

\documentclass{scrartcl}

\usepackage{graphicx}
\usepackage{tikz}
\usepackage{caption}

\begin{document}
\begin{figure}
    \begin{minipage}[b]{0.5\textwidth}
    \centering
        \begin{tikzpicture}
            \node (image) at (0,0) {\includegraphics[width=0.8\textwidth]{example-image}};
            \node (ylabel) at (-3.25,0) {$\frac{test}{test}$};
        \end{tikzpicture}
        \captionsetup{type=figure,font=footnotesize,justification=centering,margin={1cm,0.4cm},format=plain}
        \captionof{figure}{This is some junk text as caption for figure 1}
        \noindent\rule{1pt}{6pt}
        \noindent\rule{\textwidth}{1pt}
    \end{minipage}
    \begin{minipage}[b]{0.5\textwidth}
    \centering
        \begin{tikzpicture}
            \node (image) at (0,0) {\includegraphics[width=0.8\textwidth]{example-image}};
            \node (ylabel) at (-3.25,0) {$\frac{test}{test}$};
        \end{tikzpicture}
        \captionsetup{type=figure,font=footnotesize,justification=centering,margin={1cm,0.4cm},format=plain}
        \captionof{figure}{This is some junk text as caption for figure 2}
        \noindent\rule{1pt}{6pt}
        \noindent\rule{\textwidth}{1pt}

    \end{minipage}
\end{figure}
\end{document}

enter image description here

As you can see, the caption is now centered relative to the \included image.

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