Documentation/snippets/numbers-as-easy-note-heads.ly


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% DO NOT EDIT this file manually; it is automatically
% generated from Documentation/snippets/new
% Make any changes in Documentation/snippets/new/
% and then run scripts/auxiliar/makelsr.py
%
% This file is in the public domain.
%% Note: this file works from version 2.16.0
\version "2.18.0"

\header {
  lsrtags = "pitches"
  texidoc = "
Easy notation note heads use the @code{note-names} property
of the @code{NoteHead} object to determine what appears inside
the note head.  By overriding this property, it is possible
to print numbers representing the scale-degree.

A simple engraver can be created to do this for every note head
object it sees.
"
  doctitle = "Numbers as easy note heads"
} % begin verbatim


#(define Ez_numbers_engraver
   (make-engraver
    (acknowledgers
     ((note-head-interface engraver grob source-engraver)
      (let* ((context (ly:translator-context engraver))
	     (tonic-pitch (ly:context-property context 'tonic))
	     (tonic-name (ly:pitch-notename tonic-pitch))
	     (grob-pitch
	      (ly:event-property (event-cause grob) 'pitch))
	     (grob-name (ly:pitch-notename grob-pitch))
	     (delta (modulo (- grob-name tonic-name) 7))
	     (note-names
	      (make-vector 7 (number->string (1+ delta)))))
	(ly:grob-set-property! grob 'note-names note-names))))))

#(set-global-staff-size 26)

\layout {
  ragged-right = ##t
  \context {
    \Voice
    \consists \Ez_numbers_engraver
  }
}

\relative c' {
  \easyHeadsOn
  c4 d e f
  g4 a b c \break

  \key a \major
  a,4 b cis d
  e4 fis gis a \break

  \key d \dorian
  d,4 e f g
  a4 b c d
}