Add an option for adding subfloat separators

[jakubkaczor]

Currently, LaTeX code generated for sub floats places them one by one without separation. This results in adjacent images, as well as captions, in the output. It would be very handy to have an option to specify separator. One could write something like fig.subsep = "\\hfill", what would result with something like

\subfloat{\includegraphics[width=0.49\textwidth]{…} }
\hfill % here, the separator
\subfloat{\includegraphics[width=0.49\textwidth]{…} }

Here is an extreme illustration of the problem with the out.width set to 30 percent.

It would also be useful to specify separators not only in between the sub figures, but also before and after the first one and the last one respectively. This would allow more flexible layouts and centering sub figures in columns. From the interface perspactive, perhaps this could be achieved by passing a vector of separators. Eg. fig.subsep=c("\\hspace {1 cm}", "\\hfill", "\\hspace {1 cm}").

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[yihui]

I'm okay with adding this chunk option, but I may not have enough time to do it. Would you be willing to implement it by yourself and send a pull request? Thanks!

knitr/R/hooks-latex.R

Line 38 in c1b6d83

hook_plot_tex = function(x, options) {

[jakubkaczor]

I'm time constrained also, but if I find some, I will definitely take a look at it. Not later than in the summer. 😅 Not promising, though. 😉 Thank you for pointing to the place in code.

[pedropark99]

I have open a PR with the necessary changes to add such option (#2140);

[yihui]

@jakubkaczor I just merged @pedropark99's PR, and you may try the dev version now (with the chunk option you proposed, i.e., fig.subsep=c("\\hspace {1 cm}", "\\hfill", "\\hspace {1 cm}")):

remotes::install_github('yihui/knitr')

[yihui]

Oh wait a minute. It turns out that I have already had a chunk option fig.sep for separating subfigures and I have totally forgotten it: https://yihui.org/knitr/options/ Let me see what's going on...

[yihui]

I've extended the existing fig.sep option (and removed fig.subsep), so that you can use fig.sep=c("\\hspace {1 cm}", "\\hfill", "\\hspace {1 cm}") when there are two plots in a chunk.

[jakubkaczor]

Thanks! I tested it and it worked. 😉

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