Hello!
I'm trying to implement cross-staff stems that would not get
disconnected when the distance between staves changes.
Ideally, I need a function that would extend the stem from the note in
the lower staff exactly until it meets the stem of the note on the
staff above.
As a simpler solution, I want the stem length to be as long as
the distance between staves plus or minus a constant.
Since I need both the context and the particular note, I decided to go
with the \applyOutput approach and filter out non-stems.
That's where I got so far:
#(define (longerstem grob grob-origin context)
(if (memq 'stem-interface (ly:grob-interfaces grob))
(set! (ly:grob-property grob 'length)
(cdr (assoc 'Y-extent (ly:context-grob-definition context
'VerticalAlignment))))))
<< \applyOutput #'Voice #longerstem c4 >>
I get this in the output:
programming error: no pure Y common refpoint
Does anyone have an idea how to deal with it?
--
Regards,
Pavel Roskin
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