Henning Hraban Ramm schrieb am 08.09.2023 um 12:22:
Hi,
for an involved image placement (full page image starting each chapter, several stacked elements), I’d like an environment that accepts key-value arguments, like

\startMyFigure[page=left,title={My caption}]
\externalfigure[dummy]…
\stopMyFigure

I don’t think that a real float makes sense, even if the interface looks similar, since it’s always a full page in a fixed place, I need no numbering and can place the caption myself.

Does it make sense to use \definestartstop?
How would I “plugin“ the argument handling?


Or should I better define start and stop separately?

\def\startMyFigure[#1]{
% e.g. use utilities.parsers.settings_to_hash(#1)
}
\def\stopMyFigure{}


Probably I’ll need to catch the content (\externalfigure, might become more) and use it in a \setlayer – so perhaps something like

\definebuffer[MyFigure]
\define\stopMyFigure{%
 \setlayer[page]{\getMyFigure}}}
}

?
But then I don’t know how to handle the arguments.

Probably it makes most sense to do it in Lua, like

\startluacode
     interfaces.implement {
         name      = "startMyFigure",
         public    = true,
         arguments = {"hash",},
         actions   = function(h, a)
        -- …
        end, }
\stopluacode

But I didn’t find how to do environments.

When you just need an environment with a optional argument to pass user values you can use the userdata environment but be aware that you have some limitations (like verbatim)
because the mechanism uses a buffer to store the content.

For images (and other content) which are placed on a separate page at the start of a chapter
you can use the pageinjection mechanism which was added for this purpose.

Wolfgang

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