On 2021-04-07 7:52 am, Nate Whetsell wrote:
Setting Slur.positions to #'(0 . 0) appears to still move slurs.
The Internals reference [1] comments on the the positions property of
the slur-interface:
"For slurs, this value selects which slur candidate to use; if extreme
positions are requested, the closest one is taken."
The snippet [2] you mentioned is poorly worded in my opinion. Setting
positions does not move the Slur, rather it tells LilyPond to try to use
a Slur that has its ends points on the specified staff position. As
such, #'(0 . 0) does not mean there is to be no effect on the Slur,
rather it instructs LilyPond to prefer a Slur where the ends lie on the
center line.
To actually move a Slur, you could adjust its control-points property,
which holds the shape of the candidate Slur that was selected by
LilyPond. The \shape command [3] is typically used to do this as it
allows you to specify individual offsets to be applied to each control
point.
[1]:
https://lilypond.org/doc/v2.22/Documentation/internals/slur_002dinterface
[2]: https://lsr.di.unimi.it/LSR/Item?id=684
[3]:
https://lilypond.org/doc/v2.22/Documentation/notation/modifying-shapes
-- Aaron Hill
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