Afegir indicadors als pentagrames que es divideixen després d’un salt de línia
Aquest fragment de codi defineix les ordres
\splitStaffBarLine
, convUpStaffBarLine
i
convDownStaffBarLine
, que afegeix una fletxa doble a
l’últim compàs d’un pentagrama, indicant que les diverses veus
disposaran d’un pentagrama propi a la línia següent.
#(define-markup-command (arrow-at-angle layout props angle-deg length fill)
(number? number? boolean?)
(let* (
(PI-OVER-180 (/ (atan 1 1) 34))
(degrees->radians (lambda (degrees) (* degrees PI-OVER-180)))
(angle-rad (degrees->radians angle-deg))
(target-x (* length (cos angle-rad)))
(target-y (* length (sin angle-rad))))
(interpret-markup layout props
(markup
#:translate (cons (/ target-x 2) (/ target-y 2))
#:rotate angle-deg
#:translate (cons (/ length -2) 0)
#:concat (#:draw-line (cons length 0)
#:arrow-head X RIGHT fill)))))
splitStaffBarLineMarkup = \markup \with-dimensions #'(0 . 0) #'(0 . 0) {
\combine
\arrow-at-angle #45 #(sqrt 8) ##t
\arrow-at-angle #-45 #(sqrt 8) ##t
}
splitStaffBarLine = {
\once \override Staff.BarLine.stencil =
#(lambda (grob)
(ly:stencil-combine-at-edge
(ly:bar-line::print grob)
X RIGHT
(grob-interpret-markup grob splitStaffBarLineMarkup)
0))
\break
}
convDownStaffBarLine = {
\once \override Staff.BarLine.stencil =
#(lambda (grob)
(ly:stencil-combine-at-edge
(ly:bar-line::print grob)
X RIGHT
(grob-interpret-markup grob #{
\markup\with-dimensions #'(0 . 0) #'(0 . 0) {
\translate #'(0 . -.13)\arrow-at-angle #-45 #(sqrt 8) ##t
}#})
0))
\break
}
convUpStaffBarLine = {
\once \override Staff.BarLine.stencil =
#(lambda (grob)
(ly:stencil-combine-at-edge
(ly:bar-line::print grob)
X RIGHT
(grob-interpret-markup grob #{
\markup\with-dimensions #'(0 . 0) #'(0 . 0) {
\translate #'(0 . .14)\arrow-at-angle #45 #(sqrt 8) ##t
}#})
0))
\break
}
\header { = ##f }
\paper {
ragged-right = ##t
short-indent = 10\mm
}
separateSopranos = {
\set Staff.instrumentName = "AI AII"
\set Staff.shortInstrumentName = "AI AII"
\splitStaffBarLine
\change Staff = "up"
}
convSopranos = {
\convDownStaffBarLine
\change Staff = "shared"
\set Staff.instrumentName = "S A"
\set Staff.shortInstrumentName = "S A"
}
sI = {
\voiceOne
\repeat unfold 4 f''2
\separateSopranos
\repeat unfold 4 g''2
\convSopranos
\repeat unfold 4 c''2
}
sII = {
s1*2
\voiceTwo
\change Staff = "up"
\repeat unfold 4 d''2
}
aI = {
\voiceTwo
\repeat unfold 4 a'2
\voiceOne
\repeat unfold 4 b'2
\convUpStaffBarLine
\voiceTwo
\repeat unfold 4 g'2
}
aII = {
s1*2
\voiceTwo
\repeat unfold 4 g'2
}
ten = {
\voiceOne
\repeat unfold 4 c'2
\repeat unfold 4 d'2
\repeat unfold 4 c'2
}
bas = {
\voiceTwo
\repeat unfold 4 f2
\repeat unfold 4 g2
\repeat unfold 4 c2
}
\score {
<<
\new ChoirStaff <<
\new Staff = up \with {
instrumentName = "SI SII"
shortInstrumentName = "SI SII"
} {
s1*4
}
\new Staff = shared \with {
instrumentName = "S A"
shortInstrumentName = "S A"
} <<
\new Voice = sopI \sI
\new Voice = sopII \sII
\new Voice = altI \aI
\new Voice = altII \aII
>>
\new Lyrics \with {
alignBelowContext = up
}
\lyricsto sopII { e f g h }
\new Lyrics \lyricsto altI { a b c d e f g h i j k l }
\new Staff = men \with {
instrumentName = "T B"
shortInstrumentName = "T B"
} <<
\clef F
\new Voice = ten \ten
\new Voice = bas \bas
>>
\new Lyrics \lyricsto bas { a b c d e f g h i j k l }
>>
>>
\layout {
\context {
\Staff \RemoveEmptyStaves
\override VerticalAxisGroup.remove-first = ##t
}
}
}