I know it is possible to get a rule to act as a filler either side of,
say, a chapter head text by using \definefiller with alternative=rule
and, as explained in an earlier post
<https://tex.stackexchange.com/questions/497352/context-heading-text-surrounded-by-lines/497389#497389>,
define a left and right version. So, for example, for the left version:
\definefiller
[ChapterLeftRule]
[ChapterRule]
[left=\zerowidthnobreakspace,
right=\quad]
This gives me a rule that extends to the margins. What if I want the
rule to be, say, 2 cm either side of my centered header text? I tried
experimenting by replacing left=\zerowidthnobreakspace with
left=\quads[3] and that did shorten the rule somewhat, but when I did
the same for the other side, it did not balance correctly. So maybe I
need to deal with the 'left=' differently to achieve the desired
result... or try an entirely different method!
Of course, I don't want the rule at the baseline, but raised, as the
original stackexchange
<https://tex.stackexchange.com/questions/497352/context-heading-text-surrounded-by-lines/497389#497389>
example gives. Any clues?
Julian
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