I'd like an engraver that changes the colour of the note head if the
pitch meets certain conditions. If the note has an existing tweak, then
I can add to or override the tweak; but the note colour is unchanged for
a note without a tweak. Looking at the output of display-scheme-music,
the only difference is in the order of the elements in the NoteEvent. I
succeeded in writing an engraver using acknowledgers but it takes more
digging into the grob data structure to extract the pitch of the note.
\version "2.19.21"
colourEngraver =
#(lambda (context)
(make-engraver
(listeners
((note-event engraver event)
(let* ((m (ly:event-property event 'music-cause))
(tweaks (ly:music-property m 'tweaks)))
(ly:music-set-property! m 'tweaks (assoc-set! tweaks 'color red))
(display-scheme-music m))))))
\new Staff \with { \consists \colourEngraver }
{
g'4 \tweak color #blue a' \tweak font-size 0 b'
}
--
Timothy Lanfear, Bristol, UK.
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