Hi list,
in a scheme-engraver I want to get the stem-direction in the
acknowledger-slot. When I use ly:stem::calc-direction the calculated
direction is not always the visible one, when autobeaming is in effect.
A manual beam crashes lily.
So my question is: How can I retrieve the actual/current stem direction?
TIA
Jan-Peter
%%%%% snip %%%%%
\version "2.19.62"
#(define-public (stem-direction-engraver context)
(make-engraver
(acknowledgers
; store stem direction
((stem-interface engraver grob source-engraver)
; this function crashes, if a beam starts
(ly:message "stem info ~A" (ly:stem::calc-direction grob))
)
)
))
\layout {
\context {
\Voice
\consists #stem-direction-engraver
}
}
\score {
% the directions are not completely
\relative { c''8 b bes a g f e d }
}
\score {
% the function crashes with the beam-event
\relative { c''8 b[ bes] a g f e d }
}
%%%%% /snip %%%%%
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