captionsulem
I'm trying to dashed underline a word in a caption using the ulem package. While the \dashuline{} command works fine everywhere else, I get "Undefined control sequence" as error message in caption.
\begin{figure}
While it does work \dashuline{here}
\caption{It does not work \dashuline{here}}
\end{figure}
Has anyone an idea why it doesn't work and how to get it working?
I managed to solve the "problem" as it turned out not to be problem at all.
As already stated in the question, removing the twoside option resulted in the MWE functioning again. At first I didn't realise this, but as the book documentclass has by default the layout set as two-sided! So including it doesn't add anything, but more importantly, removing the statement doesn't change anything either!
In essence, the fix in the question was already the answer, but it is a mystery why the explicit statement of a default setting would result in these error messages.
I then did some further testing with classes that do not as a default have the twoside option enabled such as the article class. Without any statement (so default, oneside) the effect is as desired and doesn't give any error messages. However, when the option twoside is passed it again results in errors.
In summary, it would seem that the fltpage and caption packages are incompatible when used in a documentclass that:
a. has not, by default, a twoside layout; and a twoside layout is required and therefore passed as an option; or
b. has by default a twoside layout but this is also given as a statement when devining the documentclass.
My question related to the second option and is therefore answered, remove the optional mentioning of the twoside option. The issue remains for people wanting to use it in other documentclasses such as article, in combination with twoside layout.
This seems to work but I don't really understand why. Note that I don't have your images so I had to replace them and the white doesn't show up as well on the examples from mwe. However, you can see the captions if you look closely...
\documentclass{article}
\usepackage{graphicx,caption,subcaption,tikz}
\usetikzlibrary{backgrounds}
\usetikzlibrary{calc}
\DeclareCaptionFormat{overlay}{\gdef\capoverlay{#1#2#3\par}}
\DeclareCaptionStyle{overlay}{format=overlay}
\DeclareCaptionFormat{suboverlay}{\gdef\subcapoverlay{(\thesubfigure) #3\par}}
\DeclareCaptionStyle{suboverlay}{format=suboverlay}
\newcommand{\captionOverlay}[1]{%
\captionsetup{format=overlay}
\caption{}%
\begin{tikzpicture}
\node [inner sep=0] (image) {#1};
\draw node [white] {\capoverlay};
\end{tikzpicture}%
}
\captionsetup[subfigure]{format=suboverlay}
\newcommand{\subcaptionOverlay}[1]{%
\subcaption{}%
\begin{tikzpicture}
\node [inner sep=0] (image) {#1};
\draw node [white] {\subcapoverlay};
\end{tikzpicture}%
}
\begin{document}
\begin{figure}[htpb]
\centering
\begin{subfigure}[b]{.3\textwidth}
\centering
\subcaptionOverlay{\includegraphics[width=\textwidth]{example-image-a}}
\label{subA}
\end{subfigure}
\begin{subfigure}[b]{0.3\textwidth}
\centering
\subcaptionOverlay{\includegraphics[width=\textwidth]{example-image-a}}
\label{subB}
\end{subfigure}
\caption{}
\label{mainFig}
\end{figure}
\begin{figure}[htpb]
\centering
\captionOverlay{\includegraphics[width=\textwidth]{example-image-a}}
\label{normalFig}
\end{figure}
\end{document}
Best Answer
Protecting the command should solve the problem: