[NTG-context] Re: how to define an environment with key=value arguments

8 Sep 2023

      Am 08.09.23 um 17:02 schrieb Henning Hraban Ramm:
...
...
We can discuss the details next week and you put the resulting 
template on the wiki.
Ah, I guess I understand the template mechanism. Yet again glorious 
setups. Will probably manage.
So far:

\definepageinjection[chapter:start][
   page=left,
   alternative=setups,
   setups=frontispiz,
   color=white,
   background=color,
   backgroundcolor=Eifel,
]

\startsetups[frontispiz]
\starttransparent[tlumi]%
\externalfigure[\structureuservariable{image}][
   width=\measure{MaxWidth},
]%
\stoptransparent%
\stopsetups

\setuphead[chapter][
   page=right,
   style=\ChapterFont,
   beforesection={\pageinjection[chapter:start]},
   command=\ChapterStart,
   before={\startcolumnset[Spalten]},
   after={\vskip-\lineheight}, % fix column start
   inbetween=,
   aftersection={\stopcolumnset},
]

\startchapter[title={Prolog 2: Reiseführer}][
   motto={(quotation.}}, % used in \ChapterStart
   image={00 Lavakeller Mendig g}, % wrong
   blank=2,
]

Not a MWE, I know.
Here’s a screenshot:
https://yemaya.fiee.net/s/G2NcwE8qQrLAx8B

(Funny, I never needed all of before, after, beforesection and 
aftersection so far.)

The injection is a frame, that’s great, because I can set the 
background, and \externalfigure starts at (0,0).

But it uses its own page size, I don’t understand why. I need the 
bleed/trim area.

If I use \setlayer in the setup, the content gets placed on the next 
page, i.e. under the text.

\structureuservariable{image} in the setup gets the value from the 
_next_ chapter. Maybe the approach in from the source with
\dummyparameter\c!name
would work better, but I don’t know how to transfer it.

Hraban