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Contexts and engravers

Changing defaults

Contexts and engravers

---

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Ajout d’une basse chiffrée au-dessus ou au-dessous des notes

Une ligne de basse chiffrée peut se positionner au-dessus ou en dessous d’une partie de basse, grâce à la propriété BassFigureAlignmentPositioning.direction attachée à un contexte Staff. Les possibilités sont #UP (ou #1) pour au-dessus, #CENTER (ou #0) pour centrée, et #DOWN (ou #-1) pour en dessous.

Cette propriété peut être sujette à modification au cours de la partition. Il vous faudra insérer un \once \override si ce changement devait être temporaire.

bass = {
  \clef bass
  g4 b, c d
  e d8 c d2
}

continuo = \figuremode {
  <_>4 <6>4 <5/>4
  \override Staff.BassFigureAlignmentPositioning.direction = #UP
  %\bassFigureStaffAlignmentUp
  < _+ >4 <6>
  \set Staff.useBassFigureExtenders = ##t
  \override Staff.BassFigureAlignmentPositioning.direction = #DOWN
  %\bassFigureStaffAlignmentDown
  <4>4. <4>8 <_+>4
}

\score {
  <<
    \new Staff = bassStaff \bass
    \context Staff = bassStaff \continuo
  >>
}

---

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Ajout d’une portée supplémentaire

Vous pouvez ajouter une nouvelle portée, éventuellement de manière temporaire, après le début d’un morceau.

\score {
  <<
    \new Staff \relative c'' {
      c1 | c | c | c | c
    }
    \new StaffGroup \relative c'' {
      \new Staff {
        c1 | c
        <<
          {
            c1 | d
          }
          \new Staff {
            \once \omit Staff.TimeSignature
            c1 | b
          }
        >>
        c1
      }
    }
  >>
}

---

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Ajout d’une portée supplémentaire après un saut de ligne

Lorsqu’une nouvelle portée vient s’ajouter après un saut de ligne, LilyPond préserve un espace juste avant le saut de ligne – pour un éventuel changement d’armure qui, quoi qu’il en soit, ne sera pas imprimé. L’astuce consiste alors, comme indiqué dans l’exemple suivant, à ajuster Staff.explicitKeySignatureVisibility.

\score {
  \new StaffGroup \relative c'' {
    \new Staff
    \key f \major
    c1 c^"Unwanted extra space" \break
    << { c1 | c }
       \new Staff {
         \key f \major
         \once \omit Staff.TimeSignature
         c1 | c
       }
    >>
    c1 | c^"Fixed here" \break
    << { c1 | c }
       \new Staff {
         \once \set Staff.explicitKeySignatureVisibility = #end-of-line-invisible
         \key f \major
         \once \omit Staff.TimeSignature
         c1 | c
       }
    >>
  }
}

---

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Changement automatique de l’orientation de hampe de la note médiane selon la mélodie

Afin de suivre la ligne mélodique, LilyPond peut inverser l’orientation de hampe de la note médiane, dès lors qu’aura été ajouté au contexte de voix le graveur Melody_engraver.

La propriété de contexte suspendMelodyDecisions permet, si besoin, de désactiver temporairement ce comportement.

\relative c'' {
  \time 3/4
  a8 b g f b g |
  \set suspendMelodyDecisions = ##t
  a  b g f b g |
  \unset suspendMelodyDecisions
  c  b d c b c |
}

\layout {
  \context {
    \Voice
    \consists "Melody_engraver"
    \autoBeamOff
  }
}

---

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Numéros de mesure centrés

Les partitions pour grands ensembles disposent souvent de la numérotation des mesures centrée en dessous du système. L’extrait ci-dessous indique comment le Measure_counter_engraver permet de répondre à cette pratique. Le graveur est ici ajouté à un contexte Dynamics.

Il s’agit ici de code historique. Dès LilyPond 2.23.3, un simple \set Score.centerBarNumbers = ##t suffit.

\layout {
  \context {
    \Dynamics
    \consists #Measure_counter_engraver
    \override MeasureCounter.direction = #DOWN
    \override MeasureCounter.font-encoding = #'latin1
    \override MeasureCounter.font-shape = #'italic
    % to control the distance of the Dynamics context from the staff:
    \override VerticalAxisGroup.nonstaff-relatedstaff-spacing.padding = #2
  }
  \context {
    \Score
    \remove "Bar_number_engraver"
  }
}

pattern = \repeat unfold 7 { c'4 d' e' f' }

\new StaffGroup <<
  \new Staff {
    \pattern
  }
  \new Staff {
    \pattern
  }
  \new Dynamics {
    \startMeasureCount
    s1*7
    \stopMeasureCount
  }
>>

---

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Affectation d’un canal MIDI par voix

Lorsque LilyPond génère un fichier MIDI, chaque portée sera par défaut affectée à un canal, quel que soit le nombre de voix qu’elle contient. Ceci permet d’éviter de se retrouver à court de canaux, sachant qu’il n’y en a que seize de disponibles par piste.

Le fait de déplacer le Staff_performer dans le contexte Voice permet d’affecter à chaque voix d’une même portée un canal MIDI spécifique. Dans l’exemple suivant, la même portée donnera lieu à deux canaux MIDI différents, chacun étant affecté de son propre midiInstrument.

\score {
  \new Staff <<
    \new Voice \relative c''' {
      \set midiInstrument = #"flute"
      \voiceOne
      \key g \major
      \time 2/2
      r2 g-"Flute" ~
      g fis ~
      fis4 g8 fis e2 ~
      e4 d8 cis d2
    }
    \new Voice \relative c'' {
      \set midiInstrument = #"clarinet"
      \voiceTwo
      b1-"Clarinet"
      a2. b8 a
      g2. fis8 e
      fis2 r
    }
  >>
  \layout { }
  \midi {
    \context {
      \Staff
      \remove "Staff_performer"
    }
    \context {
      \Voice
      \consists "Staff_performer"
    }
    \tempo 2 = 72
  }
}

---

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Modification de la métrique au sein d’un fragment polymétrique à l’aide de \scaleDurations

La propriété measureLength, conjointement avec measurePosition, détermine l’endroit où une barre de mesure est requise. L’utilisation d’un \scaleDurations a l’inconvénient que l’échelonnement des durées rend compliqués les changements de métrique. Il est nécessaire en pareil cas de définir manuellement measureLength, avec un appel à ly:make-moment. Le second argument devra être identique au deuxième argument de \scaleDurations.

\layout {
  \context {
    \Score
    \remove "Timing_translator"
  }
  \context {
    \Staff
    \consists "Timing_translator"
  }
}

<<
  \new Staff {
    \scaleDurations 8/5 {
      \time 6/8
      \set Timing.measureLength = #(ly:make-moment 6/5)
      b8 b b b b b
      \time 2/4
      \set Timing.measureLength = #(ly:make-moment 4/5)
      b4 b
    }
  }
  \new Staff {
    \clef bass
    \time 2/4
    c2 d e f
  }
>>

---

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Notation pour psalmodie

Ce style de notation permet d’indiquer la mélodie d’une psalmodie lorsque les strophes sont de longueur inégale.

stemOff = \hide Staff.Stem
stemOn  = \undo \stemOff

\score {
  \new Staff \with { \remove "Time_signature_engraver" }
  {
    \key g \minor
    \cadenzaOn
    \stemOff a'\breve bes'4 g'4
    \stemOn a'2 \section
    \stemOff a'\breve g'4 a'4
    \stemOn f'2 \section
    \stemOff a'\breve^\markup { \italic flexe }
    \stemOn g'2 \fine
  }
}

---

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Impression de papier à musique

Rien n’est plus simple, pour obtenir une feuille blanche avec des portées, que de générer des mesures vides, de supprimer le Bar_number_engraver du contexte Score, et les Time_signature_engraver, Clef_engraver et Bar_engraver du contexte Staff.

#(set-global-staff-size 20)

\score {
  {
    \repeat unfold 12 { s1 \break }
  }
  \layout {
    indent = 0\in
    \context {
      \Staff
      \remove "Time_signature_engraver"
      \remove "Clef_engraver"
      \remove "Bar_engraver"
    }
    \context {
      \Score
      \remove "Bar_number_engraver"
    }
  }
}

% uncomment these lines for "letter" size
%{
\paper {
  #(set-paper-size "letter")
  ragged-last-bottom = ##f
  line-width = 7.5\in
  left-margin = 0.5\in
  bottom-margin = 0.25\in
  top-margin = 0.25\in
}
%}

% uncomment these lines for "A4" size
%{
\paper {
  #(set-paper-size "a4")
  ragged-last-bottom = ##f
  line-width = 180
  left-margin = 15
  bottom-margin = 10
  top-margin = 10
}
%}

---

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Création d’armures personnalisées

LilyPond accepte les armures personnalisées. Dans cet exemple, il s’agit d’une tonalité de ré mineur à laquelle on rajoute des bémols.

\new Staff \with {
  \override StaffSymbol.line-count = #8
  \override KeySignature.flat-positions = #'((-7 . 6))
  \override KeyCancellation.flat-positions = #'((-7 . 6))
  % presumably sharps are also printed in both octaves
  \override KeySignature.sharp-positions = #'((-6 . 7))
  \override KeyCancellation.sharp-positions = #'((-6 . 7))

  \override Clef.stencil = #
  (lambda (grob)(grob-interpret-markup grob
  #{ \markup\combine
    \musicglyph "clefs.C"
    \translate #'(-3 . -2)
    \musicglyph "clefs.F"
   #}))
    clefPosition = #3
    middleCPosition = #3
    middleCClefPosition = #3
}

{
  \key d\minor
  f bes, f bes,
}

---

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Hampes interportées

L’exemple ci-dessous illustre l’utilisation du Span_stem_engraver et de la commande \crossStaff afin de connecter des hampes entre les portées.

Nul n’est besoin de spécifier la taille des hampes ; le graveur calcule automatiquement la distance relative des têtes de note avec les portées.

\layout {
  \context {
    \PianoStaff
    \consists "Span_stem_engraver"
  }
}

{
  \new PianoStaff <<
    \new Staff {
      <b d'>4 r d'16\> e'8. g8 r\!
      e'8 f' g'4 e'2
    }
    \new Staff {
      \clef bass
      \voiceOne
      \autoBeamOff
      \crossStaff { <e g>4 e, g16 a8. c8} d
      \autoBeamOn
      g8 f g4 c2
    }
  >>
}

---

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Définition d’un graveur en Scheme : graveur d’ambitus

Cet exemple démontre comment définir son propre graveur de tessiture à base de code Scheme. Il s’agit d’une réécriture en Scheme du code contenu dans le fichier ‘lily/ambitus-engraver.cc’.

#(use-modules (oop goops))

%%%
%%% Grob utilities
%%%
%%% These are literal rewrites of some C++ methods used by the ambitus engraver.

#(define (ly:separation-item::add-conditional-item grob grob-item)
   "Add @var{grob-item} to the array of conditional elements of @var{grob}.
Rewrite of @code{Separation_item::add_conditional_item} from @file{lily/separation-item.cc}."
   (ly:pointer-group-interface::add-grob grob 'conditional-elements grob-item))

#(define (ly:accidental-placement::accidental-pitch accidental-grob)
   "Get the pitch from the grob cause of @var{accidental-grob}.
Rewrite of @code{accidental_pitch} from @file{lily/accidental-placement.cc}."
   (ly:event-property (ly:grob-property (ly:grob-parent accidental-grob Y) 'cause)
                      'pitch))

#(define (ly:accidental-placement::add-accidental grob accidental-grob)
   "Add @var{accidental-grob}, an @code{Accidental} grob, to the
list of the accidental grobs of @var{grob}, an @code{AccidentalPlacement}
grob.
Rewrite of @code{Accidental_placement::add_accidental} from @file{lily/accidental-placement.cc}."
   (let ((pitch (ly:accidental-placement::accidental-pitch accidental-grob)))
     (set! (ly:grob-parent accidental-grob X) grob)
     (let* ((accidentals (ly:grob-object grob 'accidental-grobs))
            (handle (assq (ly:pitch-notename pitch) accidentals))
            (entry (if handle (cdr handle) '())))
       (set! (ly:grob-object grob 'accidental-grobs)
             (assq-set! accidentals
                        (ly:pitch-notename pitch)
                        (cons accidental-grob entry))))))

%%%
%%% Ambitus data structure
%%%

%%% The <ambitus> class holds the various grobs that are created
%%% to print an ambitus:
%%% - ambitus-group: the grob that groups all the components of an ambitus
%%% (Ambitus grob);
%%% - ambitus-line: the vertical line between the upper and lower ambitus
%%% notes (AmbitusLine grob);
%%% - ambitus-up-note and ambitus-down-note: the note head and accidental
%%% for the lower and upper note of the ambitus (see <ambitus-note> class
%%% below).
%%% The other slots define the key and clef context of the engraver:
%%% - start-c0: position of middle c at the beginning of the piece.  It
%%% is used to place the ambitus notes according to their pitch;
%%% - start-key-sig: the key signature at the beginning of the piece.  It
%%% is used to determine if accidentals shall be printed next to ambitus
%%% notes.

#(define-class <ambitus> ()
   (ambitus-group #:accessor ambitus-group)
   (ambitus-line #:accessor ambitus-line)
   (ambitus-up-note #:getter ambitus-up-note
                    #:init-form (make <ambitus-note>))
   (ambitus-down-note #:getter ambitus-down-note
                      #:init-form (make <ambitus-note>))
   (start-c0 #:accessor ambitus-start-c0
             #:init-value #f)
   (start-key-sig #:accessor ambitus-start-key-sig
                  #:init-value '()))

%%% Accessor for the lower and upper note data of an ambitus
#(define-method (ambitus-note (ambitus <ambitus>) direction)
   "If @var{direction} is @code{UP}, then return the upper ambitus note
of @var{ambitus}, otherwise return the lower ambitus note."
   (if (= direction UP)
       (ambitus-up-note ambitus)
       (ambitus-down-note ambitus)))

%%% The <ambitus-note> class holds the grobs that are specific to ambitus
%%% (lower and upper) notes:
%%% - head: an AmbitusNoteHead grob;
%%% - accidental: an AmbitusAccidental grob, to be possibly printed next
%%% to the ambitus note head.
%%% Moreover:
%%% - pitch is the absolute pitch of the note
%%% - cause is the note event that causes this ambitus note, i.e. the lower
%%% or upper note of the considered music sequence.

#(define-class <ambitus-note> ()
   (head #:accessor ambitus-note-head
         #:init-value #f)
   (accidental #:accessor ambitus-note-accidental
               #:init-value #f)
   (cause #:accessor ambitus-note-cause
          #:init-value #f)
   (pitch #:accessor ambitus-note-pitch
          #:init-value #f))

%%%
%%% Ambitus engraving logics
%%%
%%% Rewrite of the code from @file{lily/ambitus-engraver.cc}.

#(define (make-ambitus translator)
   "Build an ambitus object: initialize all the grobs and their relations.

The Ambitus grob contain all other grobs:
 Ambitus
  |- AmbitusLine
  |- AmbitusNoteHead   for upper note
  |- AmbitusAccidental for upper note
  |- AmbitusNoteHead   for lower note
  |- AmbitusAccidental for lower note

The parent of an accidental is the corresponding note head,
and the accidental is set as the 'accidental-grob of the note head
so that is printed by the function that prints notes."
   ;; make the ambitus object
   (let ((ambitus (make <ambitus>)))
     ;; build the Ambitus grob, which will contain all other grobs
     (set! (ambitus-group ambitus) (ly:engraver-make-grob translator 'Ambitus '()))
     ;; build the AmbitusLine grob (line between lower and upper note)
     (set! (ambitus-line ambitus) (ly:engraver-make-grob translator 'AmbitusLine '()))
     ;; build the upper and lower AmbitusNoteHead and AmbitusAccidental
     (for-each (lambda (direction)
                 (let ((head (ly:engraver-make-grob translator 'AmbitusNoteHead '()))
                       (accidental (ly:engraver-make-grob translator 'AmbitusAccidental '()))
                       (group (ambitus-group ambitus)))
                   ;; The parent of the AmbitusAccidental grob is the
                   ;; AmbitusNoteHead grob
                   (set! (ly:grob-parent accidental Y) head)
                   ;; The AmbitusAccidental grob is set as the accidental-grob
                   ;; object of the AmbitusNoteHead.  This is later used by the
                   ;; function that prints notes.
                   (set! (ly:grob-object head 'accidental-grob) accidental)
                   ;; both the note head and the accidental grobs are added
                   ;; to the main ambitus grob.
                   (ly:axis-group-interface::add-element group head)
                   (ly:axis-group-interface::add-element group accidental)
                   ;; the note head and the accidental grobs are added to the
                   ;; ambitus object
                   (set! (ambitus-note-head (ambitus-note ambitus direction))
                         head)
                   (set! (ambitus-note-accidental (ambitus-note ambitus direction))
                         accidental)))
               (list DOWN UP))
     ;; The parent of the ambitus line is the lower ambitus note head
     (set! (ly:grob-parent (ambitus-line ambitus) X)
           (ambitus-note-head (ambitus-note ambitus DOWN)))
     ;; the ambitus line is added to the ambitus main grob
     (ly:axis-group-interface::add-element (ambitus-group ambitus) (ambitus-line ambitus))
     ambitus))

#(define-method (initialize-ambitus-state (ambitus <ambitus>) translator)
   "Initialize the state of @var{ambitus}, by getting the starting
position of middle C and key signature from @var{translator}'s context."
   (if (not (ambitus-start-c0 ambitus))
       (begin
         (set! (ambitus-start-c0 ambitus)
               (ly:context-property (ly:translator-context translator)
                                    'middleCPosition
                                    0))
         (set! (ambitus-start-key-sig ambitus)
               (ly:context-property (ly:translator-context translator)
                                    'keyAlterations)))))

#(define-method (update-ambitus-notes (ambitus <ambitus>) note-grob)
   "Update the upper and lower ambitus pithes of @var{ambitus}, using
@var{note-grob}."
   ;; Get the event that caused the note-grob creation
   ;; and check that it is a note-event.
   (let ((note-event (ly:grob-property note-grob 'cause)))
     (if (ly:in-event-class? note-event 'note-event)
         ;; get the pitch from the note event
         (let ((pitch (ly:event-property note-event 'pitch)))
           ;; if this pitch is lower than the current ambitus lower
           ;; note pitch (or it has not been initialized yet),
           ;; then this pitch is the new ambitus lower pitch,
           ;; and conversely for upper pitch.
           (for-each (lambda (direction pitch-compare)
                       (if (or (not (ambitus-note-pitch (ambitus-note ambitus direction)))
                               (pitch-compare pitch
                                              (ambitus-note-pitch (ambitus-note ambitus direction))))
                           (begin
                             (set! (ambitus-note-pitch (ambitus-note ambitus direction))
                                   pitch)
                             (set! (ambitus-note-cause (ambitus-note ambitus direction))
                                   note-event))))
                     (list DOWN UP)
                     (list ly:pitch<? (lambda (p1 p2)
                                        (ly:pitch<? p2 p1))))))))

#(define-method (typeset-ambitus (ambitus <ambitus>) translator)
   "Typeset the ambitus:
- place the lower and upper ambitus notes according to their pitch and
  the position of the middle C;
- typeset or delete the note accidentals, according to the key signature.
  An accidental, if it is to be printed, is added to an AccidentalPlacement
  grob (a grob dedicated to the placement of accidentals near a chord);
- both note heads are added to the ambitus line grob, so that a line should
  be printed between them."
   ;; check if there are lower and upper pitches
   (if (and (ambitus-note-pitch (ambitus-note ambitus UP))
            (ambitus-note-pitch (ambitus-note ambitus DOWN)))
       ;; make an AccidentalPlacement grob, for placement of note accidentals
       (let ((accidental-placement (ly:engraver-make-grob
                                    translator
                                    'AccidentalPlacement
                                    (ambitus-note-accidental (ambitus-note ambitus DOWN)))))
         ;; For lower and upper ambitus notes:
         (for-each (lambda (direction)
                     (let ((pitch (ambitus-note-pitch (ambitus-note ambitus direction))))
                       ;; set the cause and the staff position of the ambitus note
                       ;; according to the associated pitch
                       (set! (ly:grob-property (ambitus-note-head (ambitus-note ambitus direction))
                                               'cause)
                             (ambitus-note-cause (ambitus-note ambitus direction)))
                       (set! (ly:grob-property (ambitus-note-head (ambitus-note ambitus direction))
                                               'staff-position)
                             (+ (ambitus-start-c0 ambitus)
                                (ly:pitch-steps pitch)))
                       ;; determine if an accidental shall be printed for this note,
                       ;; according to the key signature
                       (let* ((handle (or (assoc (cons (ly:pitch-octave pitch)
                                                       (ly:pitch-notename pitch))
                                                 (ambitus-start-key-sig ambitus))
                                          (assoc (ly:pitch-notename pitch)
                                                 (ambitus-start-key-sig ambitus))))
                              (sig-alter (if handle (cdr handle) 0)))
                         (cond ((= (ly:pitch-alteration pitch) sig-alter)
                                ;; the note alteration is in the key signature
                                ;; => it does not have to be printed
                                (ly:grob-suicide!
                                 (ambitus-note-accidental (ambitus-note ambitus direction)))
                                (set! (ly:grob-object (ambitus-note-head (ambitus-note ambitus direction))
                                                      'accidental-grob)
                                      '()))
                               (else
                                ;; otherwise, the accidental shall be printed
                                (set! (ly:grob-property (ambitus-note-accidental
                                                         (ambitus-note ambitus direction))
                                                        'alteration)
                                      (ly:pitch-alteration pitch)))))
                       ;; add the AccidentalPlacement grob to the
                       ;; conditional items of the AmbitusNoteHead
                       (ly:separation-item::add-conditional-item
                        (ambitus-note-head (ambitus-note ambitus direction))
                        accidental-placement)
                       ;; add the AmbitusAccidental to the list of the
                       ;; AccidentalPlacement grob accidentals
                       (ly:accidental-placement::add-accidental
                        accidental-placement
                        (ambitus-note-accidental (ambitus-note ambitus direction)))
                       ;; add the AmbitusNoteHead grob to the AmbitusLine grob
                       (ly:pointer-group-interface::add-grob
                        (ambitus-line ambitus)
                        'note-heads
                        (ambitus-note-head (ambitus-note ambitus direction)))))
                   (list DOWN UP))
         ;; add the AccidentalPlacement grob to the main Ambitus grob
         (ly:axis-group-interface::add-element (ambitus-group ambitus) accidental-placement))
       ;; no notes ==> suicide the grobs
       (begin
         (for-each (lambda (direction)
                     (ly:grob-suicide! (ambitus-note-accidental (ambitus-note ambitus direction)))
                     (ly:grob-suicide! (ambitus-note-head (ambitus-note ambitus direction))))
                   (list DOWN UP))
         (ly:grob-suicide! ambitus-line))))

%%%
%%% Ambitus engraver definition
%%%
#(define ambitus-engraver
   (lambda (context)
     (let ((ambitus #f))
       ;; when music is processed: make the ambitus object, if not already built
       (make-engraver
    ((process-music translator)
     (if (not ambitus)
         (set! ambitus (make-ambitus translator))))
    ;; set the ambitus clef and key signature state
    ((stop-translation-timestep translator)
     (if ambitus
         (initialize-ambitus-state ambitus translator)))
    ;; when a note-head grob is built, update the ambitus notes
    (acknowledgers
          ((note-head-interface engraver grob source-engraver)
       (if ambitus
           (update-ambitus-notes ambitus grob))))
    ;; finally, typeset the ambitus according to its upper and lower notes
    ;; (if any).
    ((finalize translator)
     (if ambitus
         (typeset-ambitus ambitus translator)))))))

%%%
%%% Example
%%%

\score {
  \new StaffGroup <<
    \new Staff { c'4 des' e' fis' gis' }
    \new Staff { \clef "bass" c4 des ~ des ees b, }
  >>
  \layout { \context { \Staff \consists #ambitus-engraver } }
}

---

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Affichage d’un système complet lorsqu’une seule portée est active

Il arrive, dans les partitions d’orchestre, qu’un instrument ou un groupe d’instruments ne joue pas pendant un moment et que leurs portées disparaisse pendant ce temps – à l’aide de \removeEmptyStaves.

Il est préférable, lorsque l’un d’entre eux reprend, d’imprimer toutes les portées du groupe en question grâce au Keep_alive_together_engraver placé au niveau du regroupement, qu’il s’agisse d’un GrandStaff ou d’un StaffGroup.

Dans l’exemple suivant, les violons ne jouent pas lors des deuxième et troisième systèmes. Bien que seul le premier violon redémarre à la dernière mesure, la portée de second violon apparaît elle aussi.

\score {
  <<
    \new StaffGroup = "StaffGroup_woodwinds"
    <<
      \new Staff = "Staff_flute" \with {
        instrumentName = "Flute"
        shortInstrumentName = "Fl"
      }
      \relative c' {
        \repeat unfold 3 { c'4 c c c | c c c c | c c c c | \break }
      }
    >>
    \new StaffGroup = "StaffGroup_Strings"
    <<
      \new GrandStaff = "GrandStaff_violins"
      <<
        \new Staff = "StaffViolinI" \with {
          instrumentName = "Violin I"
          shortInstrumentName = "Vi I"
        }
        \relative c'' {
          a1 \repeat unfold 7 { s1 } \repeat unfold 12 a16  a4
        }
        \new Staff = "StaffViolinII" \with {
          instrumentName = "Violin II"
          shortInstrumentName = "Vi II"
        }
        \relative c' { e1 \repeat unfold 8 { s1 } }
      >>
      \new Staff = "Staff_cello" \with {
        instrumentName = "Cello"
        shortInstrumentName = "Ce"
      }
      \relative c { \clef bass \repeat unfold 9 { c1 }}
    >>
  >>
}
\layout {
  indent = 3.0\cm
  short-indent = 1.5\cm
  \context {
    \GrandStaff
    \consists Keep_alive_together_engraver
  }
  \context {
    \Staff
    \RemoveEmptyStaves
  }
}

---

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Les graveurs un par un

Pour appréhender la notation, nous l’avons disséquée en éléments simples : chaque type de symbole est géré par un module différent. Chaque module est appelé « graveur ». Dans cet exemple, chaque graveur est appelé à son tour, dans l’ordre suivant :

• têtes de note,
• symboles de la portée,
• clef,
• hampes,
• ligatures, liaisons, accents,
• altérations, barres de mesure, métrique et armure.

Les graveurs se regroupent. Par exemple, têtes de note, liaisons, ligature, etc. forment un contexte de voix (Voice). Les graveurs chargés de la métrique, des altérations, des barres de mesure, etc. forment un contexte de portée (Staff).

%% sample music
topVoice = \relative c' {
  \key d \major
  es8([ g] a[ fis])
  b4
  b16[-. b-. b-. cis-.]
  d4->
}

botVoice = \relative c' {
  \key d \major
  c8[( f] b[ a)]
  es4
  es16[-. es-. es-. fis-.]
  b4->
}

hoom = \relative c {
  \key d \major
  \clef bass
  g8-. r
  r4
  fis8-.
  r8
  r4
  b'4->
}

pah = \relative c' {
  r8 b-.
  r4
  r8 g8-.
  r16 g-. r8
  \clef treble
  fis'4->
}

%
% setup for Request->Element conversion. Guru-only
%

MyStaff = \context {
  \type "Engraver_group"
  \name Staff

  \description "Handles clefs, bar lines, keys, accidentals.  It can contain
@code{Voice} contexts."

  \consists "Output_property_engraver"

  \consists "Font_size_engraver"

  \consists "Volta_engraver"
  \consists "Separating_line_group_engraver"
  \consists "Dot_column_engraver"

  \consists "Ottava_spanner_engraver"
  \consists "Rest_collision_engraver"
  \consists "Piano_pedal_engraver"
  \consists "Piano_pedal_align_engraver"
  \consists "Instrument_name_engraver"
  \consists "Grob_pq_engraver"
  \consists "Forbid_line_break_engraver"
  \consists "Axis_group_engraver"

  \consists "Pitch_squash_engraver"

  localAlterations = #'()

  % explicitly set instrumentName, so we don't get
  % weird effects when doing instrument names for
  % piano staves

  instrumentName = #'()
  shortInstrumentName = #'()

  \accepts "Voice"
  \defaultchild "Voice"
}


MyVoice = \context {
  \type "Engraver_group"
  \name Voice

  \description "
    Corresponds to a voice on a staff.  This context handles the
    conversion of dynamic signs, stems, beams, super- and subscripts,
    slurs, ties, and rests.

    You have to instantiate this explicitly if you want to have
    multiple voices on the same staff."

  localAlterations = #'()
  \consists "Font_size_engraver"

  % must come before all
  \consists "Output_property_engraver"
  \consists "Arpeggio_engraver"
  \consists "Multi_measure_rest_engraver"
  \consists "Text_spanner_engraver"
  \consists "Grob_pq_engraver"
  \consists "Note_head_line_engraver"
  \consists "Glissando_engraver"
  \consists "Ligature_bracket_engraver"
  \consists "Breathing_sign_engraver"
  % \consists "Rest_engraver"
  \consists "Grace_beam_engraver"
  \consists "New_fingering_engraver"
  \consists "Chord_tremolo_engraver"
  \consists "Percent_repeat_engraver"
  \consists "Slash_repeat_engraver"

  %{
    Must come before text_engraver, but after note_column engraver.
  %}
  \consists "Text_engraver"
  \consists "Dynamic_engraver"
  \consists "Dynamic_align_engraver"
  \consists "Fingering_engraver"

  \consists "Script_column_engraver"
  \consists "Rhythmic_column_engraver"
  \consists "Cluster_spanner_engraver"
  \consists "Tie_engraver"
  \consists "Tie_engraver"
  \consists "Tuplet_engraver"
  \consists "Note_heads_engraver"
  \consists "Rest_engraver"
}


\score {
  \topVoice
  \layout {
    \context { \MyStaff }
    \context { \MyVoice }
  }
}


MyStaff = \context {
  \MyStaff
  \consists "Staff_symbol_engraver"
}

\score {
  \topVoice
  \layout {
    \context { \MyStaff }
    \context { \MyVoice }
  }
}

MyStaff = \context {
  \MyStaff
  \consists "Clef_engraver"
  \remove "Pitch_squash_engraver"
}

\score {
  \topVoice
  \layout {
    \context { \MyStaff }
    \context { \MyVoice }
  }
}

MyVoice = \context {
  \MyVoice
  \consists "Stem_engraver"
}

\score {
  \topVoice
  \layout {
    \context { \MyStaff }
    \context { \MyVoice }
  }
}

MyVoice = \context {
  \MyVoice
  \consists "Beam_engraver"
}

\score {
  \topVoice
  \layout {
    \context { \MyStaff }
    \context { \MyVoice }
  }
}

MyVoice = \context {
  \MyVoice
  \consists "Phrasing_slur_engraver"
  \consists "Slur_engraver"
  \consists "Script_engraver"
}


\score {
  \topVoice
  \layout {
    \context { \MyStaff }
    \context { \MyVoice }
  }
}

MyStaff = \context {
  \MyStaff
  \consists "Bar_engraver"
  \consists "Time_signature_engraver"
}

\score {
  \topVoice
  \layout {
    \context { \MyStaff }
    \context { \MyVoice }
  }
}

MyStaff = \context {
  \MyStaff
  \consists "Accidental_engraver"
  \consists "Key_engraver"
}
\score {
  \topVoice
  \layout {
    \context { \MyStaff }
    \context { \MyVoice }
  }
}

---

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Présentation à l’ancienne (barres de mesure entre les portées)

En musique mensurale, les barres de mesure ne traversent pas les portées. Pour obtenir ce résultat il faudra définir measureBarType à "-span|" et utiliser un regroupement de portées permettant l’extension des barres entre les portées, tel un StaffGroup.

\layout {
  \context {
    \Staff
    measureBarType = "-span|"
  }
}

music = \fixed c'' {
  c1
  d2 \section e2
  f1 \fine
}

\new StaffGroup <<
  \new Staff \music
  \new Staff \music
>>

---

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Imbrications de regroupements de portées

La propriété systemStartDelimiterHierarchy permet de créer des regroupements imbriqués complexes. La commande \set StaffGroup.systemStartDelimiterHierarchy prend en argument la liste alphabétique des sous-groupes à hiérarchiser. Chaque sous-groupe peut être affublé d’un délimiteur particulier. Chacun des regroupements intermédiaires doit être borné par des parenthèses. Bien que des éléments de la liste puissent être omis, le premier délimiteur embrassera toujours l’intégralité des portées. Vous disposez des quatre délimiteurs SystemStartBar, SystemStartBracket, SystemStartBrace et SystemStartSquare.

\new StaffGroup
\relative c'' <<
  \override StaffGroup.SystemStartSquare.collapse-height = #4
  \set StaffGroup.systemStartDelimiterHierarchy
    = #'(SystemStartSquare (SystemStartBrace (SystemStartBracket a
                             (SystemStartSquare b)  ) c ) d)
  \new Staff { c1 }
  \new Staff { c1 }
  \new Staff { c1 }
  \new Staff { c1 }
  \new Staff { c1 }
>>

---

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Numérotation de groupes de mesures

Cet extrait illustre l’utilisation du Measure_counter_engraver aux fins de numéroter un groupe de mesures successives. La section à numéroter peut éventuellement comporter des reprises.

Le graveur doit être ajouté au contexte approprié. Il est ici attaché au contexte Staff, mais pourrait l’être à un contexte Dynamics.

Le compteur est lancé par \startMeasureCount et arrêté par \stopMeasureCount. La numérotation commence à 1 par défaut, comportement qui peut se modifier à l’aide de la propriété count-from.

Lorsqu’une mesure s’étend après un saut de ligne, le numéro y est alors répété, entre parenthèses.

\layout {
  \context {
    \Staff
    \consists #Measure_counter_engraver
  }
}

\new Staff {
  \startMeasureCount
  \repeat unfold 7 {
    c'4 d' e' f'
  }
  \stopMeasureCount
  \bar "||"
  g'4 f' e' d'
  \override Staff.MeasureCounter.count-from = #2
  \startMeasureCount
  \repeat unfold 5 {
    g'4 f' e' d'
  }
  g'4 f'
  \bar ""
  \break
  e'4 d'
  \repeat unfold 7 {
    g'4 f' e' d'
  }
  \stopMeasureCount
}

---

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Print ChordNames with same root and different bass as slash and bass-note

To print subsequent ChordNames only differing in its bass note as slash and bass note use the here defined engraver. The behaviour may be controlled in detail by the chordChanges context property.

#(define Bass_changes_equal_root_engraver
  (lambda (ctx)
  "For sequential @code{ChordNames} with same root, but different bass, the root
markup is dropped: D D/C D/B  -> D /C /B
The behaviour may be controlled by setting the @code{chordChanges}
context-property."
    (let ((chord-pitches '())
          (last-chord-pitches '())
          (bass-pitch #f))
      (make-engraver
        ((initialize this-engraver)
          (let ((chord-note-namer (ly:context-property ctx 'chordNoteNamer)))
            ;; Set 'chordNoteNamer, respect user setting if already done
            (ly:context-set-property! ctx 'chordNoteNamer
              (if (procedure? chord-note-namer)
                  chord-note-namer
                  note-name->markup))))
        (listeners
          ((note-event this-engraver event)
            (let* ((pitch (ly:event-property event 'pitch))
                   (pitch-name (ly:pitch-notename pitch))
                   (pitch-alt (ly:pitch-alteration pitch))
                   (bass (ly:event-property event 'bass #f))
                   (inversion (ly:event-property event 'inversion #f)))
            ;; Collect notes of the chord
            ;;  - to compare inversed chords we need to collect the bass note
            ;;    as usual member of the chord, whereas an added bass must be
            ;;    treated separate from the usual chord-notes
            ;;  - notes are stored as pairs containing their
            ;;    pitch-name (an integer), i.e. disregarding their octave and
            ;;    their alteration
            (cond (bass (set! bass-pitch pitch))
                  (inversion
                    (set! bass-pitch pitch)
                    (set! chord-pitches
                          (cons (cons pitch-name pitch-alt) chord-pitches)))
                  (else
                    (set! chord-pitches
                          (cons (cons pitch-name pitch-alt) chord-pitches)))))))
        (acknowledgers
          ((chord-name-interface this-engraver grob source-engraver)
            (let ((chord-changes (ly:context-property ctx 'chordChanges #f)))
              ;; If subsequent chords are equal apart from their bass,
              ;; reset the 'text-property.
              ;; Equality is done by comparing the sorted lists of this chord's
              ;; elements and the previous chord. Sorting is needed because
              ;; inverted chords may have a different order of pitches.
              ;; `chord-changes' needs to be true
              (if (and bass-pitch
                       chord-changes
                       (equal?
                         (sort chord-pitches car<)
                         (sort last-chord-pitches car<)))
                  (ly:grob-set-property! grob 'text
                    (make-line-markup
                      (list
                        (ly:context-property ctx 'slashChordSeparator)
                        ((ly:context-property ctx 'chordNoteNamer)
                         bass-pitch
                         (ly:context-property ctx 'chordNameLowercaseMinor))))))
              (set! last-chord-pitches chord-pitches)
              (set! chord-pitches '())
              (set! bass-pitch #f))))
        ((finalize this-engraver)
          (set! last-chord-pitches '()))))))

myChords = \chordmode {
  %\germanChords

  \set chordChanges = ##t
  d2:m d:m/cis

  d:m/c
  \set chordChanges = ##f
  d:m/b

  e1:7
  \set chordChanges = ##t
  e
  \break
  \once \set chordChanges = ##f
  e1/f
  e2/gis e/+gis e e:m/f d:m d:m/cis d:m/c
  \set chordChanges = ##f
  d:m/b
}

<<
  \new ChordNames
    \with { \consists #Bass_changes_equal_root_engraver }
    \myChords
  \new Staff \myChords
>>

---

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Suppression des numéros de mesure d’une partition

Désactiver le graveur concerné – Bar_number_engraver – donnera une partition – contexte Score – sans numéros de mesure.

\layout {
  \context {
    \Score
    \omit BarNumber
    % or:
    %\remove "Bar_number_engraver"
  }
}

\relative c'' {
  c4 c c c \break
  c4 c c c
}

---

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Indication de regroupement de portées par un rectangle

Un regroupement de portées sera indiqué par un simple rectangle – SystemStartSquare – en début de ligne dès lors que vous le mentionnerez explicitement au sein d’un contexte StaffGroup ou ChoirStaff.

\score {
  \new StaffGroup { <<
  \set StaffGroup.systemStartDelimiter = #'SystemStartSquare
    \new Staff { c'4 d' e' f' }
    \new Staff { c'4 d' e' f' }
  >> }
}

---

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Utilisation de lignes de repères dans une partition « à la française »

Le recours à des contextes MarkLine (tel qu’indiqué dans le LSR1010) dans une partition « à la française » peut s’avérer problématique lorsque toutes les portées entre deux contextes Markline sont absentes d’un système. La présence du Keep_alive_together_engraver au sein de chacun des StaffGroup permet de maintenir actif le MarkLine uniquement lorsque les autres portées du regroupement sont elles-mêmes actives.

bars = {
  \tempo "Allegro" 4=120
  s1*2
  \repeat unfold 5 { \mark \default s1*2 }
  \bar "||"
  \tempo "Adagio" 4=40
  s1*2
  \repeat unfold 8 { \mark \default s1*2 }
  \bar "|."
}
winds = \repeat unfold 120 { c''4 }
trumpet = { \repeat unfold 8 g'2 R1*16 \repeat unfold 4 g'2 R1*8 }
trombone = { \repeat unfold 4 c'1 R1*8 d'1 R1*17 }
strings = \repeat unfold 240 { c''8 }

#(set-global-staff-size 16)
\paper {
  systems-per-page = 5
  ragged-last-bottom = ##f
}

\layout {
  indent = 15\mm
  short-indent = 5\mm
  \context {
    \name MarkLine
    \type Engraver_group
    \consists Output_property_engraver
    \consists Axis_group_engraver
    \consists Mark_engraver
    \consists Metronome_mark_engraver
    \consists Staff_collecting_engraver
    \override VerticalAxisGroup.remove-empty = ##t
    \override VerticalAxisGroup.remove-layer = #'any
    \override VerticalAxisGroup.staff-affinity = #DOWN
    \override VerticalAxisGroup.nonstaff-relatedstaff-spacing.padding = 1
    keepAliveInterfaces = #'()
  }
  \context {
    \Staff
    \override VerticalAxisGroup.remove-empty = ##t
    \override VerticalAxisGroup.remove-layer = ##f
  }
  \context {
    \StaffGroup
    \accepts MarkLine
    \consists Keep_alive_together_engraver
  }
  \context {
    \Score
    \remove Mark_engraver
    \remove Metronome_mark_engraver
    \remove Staff_collecting_engraver
  }
}

\score {
  <<
    \new StaffGroup = "winds" \with {
      instrumentName = "Winds"
      shortInstrumentName = "Winds"
    } <<
      \new MarkLine \bars
      \new Staff \winds
    >>
    \new StaffGroup = "brass" <<
      \new MarkLine \bars
      \new Staff = "trumpet" \with {
        instrumentName = "Trumpet"
        shortInstrumentName = "Tpt"
      } \trumpet
      \new Staff = "trombone" \with {
        instrumentName = "Trombone"
        shortInstrumentName = "Tbn"
      } \trombone
    >>
    \new StaffGroup = "strings" \with {
      instrumentName = "Strings"
      shortInstrumentName = "Strings"
    } <<
      \new MarkLine \bars
      \new Staff = "strings" { \strings }
    >>
  >>
}

---

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Ensemble vocal avec alignement des paroles selon le contexte

Ce canevas ressemble beaucoup à celui pour chœur à quatre voix mixtes. La différence réside dans le fait que les paroles sont positionnées en ayant recours à alignAboveContext et alignBelowContext.

global = {
  \key c \major
  \time 4/4
}

sopMusic = \relative c'' {
  c4 c c8[( b)] c4
}
sopWords = \lyricmode {
  hi hi hi hi
}

altoMusic = \relative c' {
  e4 f d e
}
altoWords = \lyricmode {
  ha ha ha ha
}

tenorMusic = \relative c' {
  g4 a f g
}
tenorWords = \lyricmode {
  hu hu hu hu
}

bassMusic = \relative c {
  c4 c g c
}
bassWords = \lyricmode {
  ho ho ho ho
}

\score {
  \new ChoirStaff <<
    \new Staff = "women" <<
      \new Voice = "sopranos" { \voiceOne << \global \sopMusic >> }
      \new Voice = "altos" { \voiceTwo << \global \altoMusic >> }
    >>
    \new Lyrics \with { alignAboveContext = #"women" }
      \lyricsto "sopranos" \sopWords
    \new Lyrics \with { alignBelowContext = #"women" }
      \lyricsto "altos" \altoWords
    % we could remove the line about this with the line below, since
    % we want the alto lyrics to be below the alto Voice anyway.
    % \new Lyrics \lyricsto "altos" \altoWords

    \new Staff = "men" <<
      \clef bass
      \new Voice = "tenors" { \voiceOne << \global \tenorMusic >> }
      \new Voice = "basses" { \voiceTwo << \global \bassMusic >> }
    >>
    \new Lyrics \with { alignAboveContext = #"men" }
      \lyricsto "tenors" \tenorWords
    \new Lyrics \with { alignBelowContext = #"men" }
      \lyricsto "basses" \bassWords
    % again, we could replace the line above this with the line below.
    % \new Lyrics \lyricsto "basses" \bassWords
  >>
}

---

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Ensemble vocal avec couplet et refrain

Ce canevas illustre la manière d’agencer une œuvre vocale où le couplet est chanté en solo et le refrain à deux voix. Vous noterez le recours aux silences invisibles dans la variable \global : ils permettent de positionner les changements de métrique et autres éléments communs à toutes les parties, ce pour l’intégralité du morceau.

global = {
  \key g \major

  % verse
  \time 3/4
  s2.*2
  \break

  % refrain
  \time 2/4
  s2*2
  \bar "|."
}

SoloNotes = \relative g' {
  \clef "treble"

  % verse
  g4 g g |
  b4 b b |

  % refrain
  R2*2 |
}

SoloLyrics = \lyricmode {
  One two three |
  four five six |
}

SopranoNotes = \relative c'' {
  \clef "treble"

  % verse
  R2.*2 |

  % refrain
  c4 c |
  g4 g |
}

SopranoLyrics = \lyricmode {
  la la |
  la la |
}

BassNotes = \relative c {
  \clef "bass"

  % verse
  R2.*2 |

  % refrain
  c4 e |
  d4 d |
}

BassLyrics = \lyricmode {
  dum dum |
  dum dum |
}

\score {
  <<
    \new Voice = "SoloVoice" << \global \SoloNotes >>
    \new Lyrics \lyricsto "SoloVoice" \SoloLyrics

    \new ChoirStaff <<
      \new Voice = "SopranoVoice" << \global \SopranoNotes >>
      \new Lyrics \lyricsto "SopranoVoice" \SopranoLyrics

      \new Voice = "BassVoice" << \global \BassNotes >>
      \new Lyrics \lyricsto "BassVoice" \BassLyrics
    >>
  >>
  \layout {
    ragged-right = ##t
    \context { \Staff
      % these lines prevent empty staves from being printed
      \RemoveEmptyStaves
      \override VerticalAxisGroup.remove-first = ##t
    }
  }
}

---

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