Re: Note head as a custom image chosen according to note duration

[Jean Abou Samra]

Le 21/11/2022 à 13:43, Jean Faure a écrit :
> Hi. The code below is a copy&paste, I do not quite understand what it 
> does. Can I modify it so that an image is chosen according to the 
> following note's duration? Like custom4.eps, custom8.eps?
>
> customHead = {
>  \once \override NoteHead  #'stencil = #ly:text-interface::print
>  \once \override NoteHead #'text =
>    \markup {
>      \general-align #Y #CENTER {
>        \epsfile #X #2 #"./custom.eps"
>      }
>    }
>  }
> { e'4 f' \customHead g'4 }




Yes, use a callback for that:


\version "2.22.2"

customHead = {
  \once \override NoteHead.stencil = #ly:text-interface::print
  \once \override NoteHead.text =
    #(lambda (grob)
       #{
          \markup \general-align #Y #CENTER
              #(case (ly:duration-log (ly:event-property (event-cause 
grob) 'duration))
                 ;; whole note:
                 ((0) #{ \markup \epsfile #X #2 "custom1.eps" #})
                 ;; half note:
                 ((1) #{ \markup \epsfile #X #3 "custom2.eps" #})
                 ;; quarter note:
                 ((2) #{ \markup \epsfile #X #4 "custom4.eps" #})
                 ;; eighth note:
                 ((3) #{ \markup \epsfile #X #5 "custom8.eps" #})
                 ;; Add more here if necessary (keeping the "else" line 
below).
                 (else ""))
       #})
}

{
  \customHead c'1
  \customHead c'2
  \customHead c'4
  \customHead c'8
}




Have a look at these pages:

https://lilypond.org/doc/v2.22/Documentation/extending/callback-functions
https://extending-lilypond.readthedocs.io/en/latest/backend.html#understanding-callbacks

Best,
Jean

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