Hi all, I'm working on a work-around for a collision between ledger
lines and articulations, for Clairnote an alternative notation system:
http://clairnote.org/sn/ LilyPond does not currently take non-standard
'extra' ledger lines into account when positioning articulations.
Here's a minimal example with a proof of concept for a possible work-around:
%%%%%%%%%%
\version "2.19.63"
m = {
c'''
c'''\fermata
c'''\trill
c'''-^
c'''-.
c'''\segno
}
% collisions ahead!
{
\override Staff.StaffSymbol.ledger-extra = 2
\m
}
% wrap the usual Script.Y-offset procedure in another
% one to make an adjustment to what it returns, to
% avoid the collisions
{
\override Staff.StaffSymbol.ledger-extra = 2
\override Staff.Script.Y-offset =
#(lambda (grob)
(+ 1 (ly:side-position-interface::y-aligned-side grob)))
\m
}
%%%%%%%%%%
Here's my specific question. The docs say this for the Y-offset
property of the Script object:
|Y-offset| (number):
|#<unpure-pure-container #<primitive-procedure
ly:side-position-interface::y-aligned-side> #<primitive-procedure
ly:side-position-interface::pure-y-aligned-side> >|
The vertical amount that this object is moved relative to its Y-parent.
http://lilypond.org/doc/v2.19/Documentation/internals/script
But in the source code, in 'scm/define-grobs.scm', for the Script grob I
see no mention of unpure-pure-container:
(Y-offset . ,side-position-interface::y-aligned-side)
I see other grob properties in that file that do have the
unpure-pure-container pattern, like Rest.Y-extent:
(Y-extent . ,(ly:make-unpure-pure-container ly:rest::height
ly:rest::pure-height))
So am I missing something or are the docs off for Script.Y-offset? Is a
call to "(ly:side-position-interface::y-aligned-side grob)" actually the
default call to use?
(On the other hand, maybe it would work to change the Y-parent of Script
grobs to be the ledger lines grob in cases where there are ledger lines
that are further from the staff than the furthest note head?)
Thanks,
-Paul
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