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

   1 % Do not edit this file; it is automatically
   2 % generated from Documentation/snippets/new
   3 % This file is in the public domain.
   4 %% Note: this file works from version 2.13.11
   5 \version "2.13.11"
   6
   7 \header {
   8   lsrtags = "pitches"
   9   texidoc = "
  10 Easy notation note heads use the @code{note-names} property
  11 of the @code{NoteHead} object to determine what appears inside
  12 the note head.  By overriding this property, it is possible
  13 to print numbers representing the scale-degree.
  14
  15 A simple engraver can be created to do this for every note head
  16 object it sees.
  17 "
  18   doctitle = "Numbers as easy note heads"
  19 } % begin verbatim
  20
  21
  22 #(define Ez_numbers_engraver
  23    (list
  24     (cons 'acknowledgers
  25           (list
  26            (cons 'note-head-interface
  27                  (lambda (engraver grob source-engraver)
  28                    (let* ((context (ly:translator-context engraver))
  29                           (tonic-pitch (ly:context-property context 'tonic))
  30                           (tonic-name (ly:pitch-notename tonic-pitch))
  31                           (grob-pitch
  32                            (ly:event-property (event-cause grob) 'pitch))
  33                           (grob-name (ly:pitch-notename grob-pitch))
  34                           (delta (modulo (- grob-name tonic-name) 7))
  35                           (note-names
  36                            (make-vector 7 (number->string (1+ delta)))))
  37                      (ly:grob-set-property! grob 'note-names note-names))))))))
  38
  39 #(set-global-staff-size 26)
  40
  41 \layout {
  42   ragged-right = ##t
  43   \context {
  44     \Voice
  45     \consists \Ez_numbers_engraver
  46   }
  47 }
  48
  49 \relative c' {
  50   \easyHeadsOn
  51   c4 d e f
  52   g4 a b c \break
  53
  54   \key a \major
  55   a,4 b cis d
  56   e4 fis gis a \break
  57
  58   \key d \dorian
  59   d,4 e f g
  60   a4 b c d
  61 }