On 8/11/2024 11:24 AM, Florent Michel wrote:
Hi,
I am trying to reproduce the behaviour of the tcolorbox LaTeX package,
more specifically breakable boxes (as illustrated here:
https://tex.stackexchange.com/a/676607/123770
<https://tex.stackexchange.com/a/676607/123770>). It works nicely out of
the box (pun intended) using `\definetextbackground` and drawing the
frame with MetaPost, using counters to keep track of whether the current
text is at the top, middle, or bottom of the box. However, I'm having
issues when one box ends and another starts on the same page (see more
details below). From what I understand, the issue is that counters seem
to be updated on a page-wide basis, so each MPgraphic ‘sees’ the values
of counters at the end of the current page, which may not be right if
another box modifies them. Would anyone know how to resolve this?
Based on two answer on TeX StackExchange
(https://tex.stackexchange.com/a/486124/123770
<https://tex.stackexchange.com/a/486124/123770> ,
https://tex.stackexchange.com/questions/377234/context-frame-problems/377261#377261 <https://tex.stackexchange.com/questions/377234/context-frame-problems/377261#377261>), the following code works well if there is no more than one box per page:
```
You're missing a feature:
this is the original trick:
if multilocs[i] == 1 : % begin
elseif multilocs[i] == 2 : % between
elseif multilocs[i] == 3 : % end
fi ;
and in lmtx we have
if multikind[i] = "single" :
elseif multikind[i] = "first" :
elseif multikind[i] = "middle" :
elseif multikind[i] = "last" :
Also:
path p;
p := ( llcorner multipars[i]
-- lrcorner multipars[i]
-- urcorner multipars[i]
-- ulcorner multipars[i]
-- cycle )
enlarged (EmWidth,EmWidth) ;
fill p withcolor boxfillcolor ;
can be
fill multipars[i] enlarged (EmWidth,EmWidth) ...
Hans
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