%% Generated by lilypond-book
%% Options: [exampleindent=10.16\mm,indent=0\mm,line-width=160\mm]
\include "lilypond-book-preamble.ly"


% ****************************************************************
% Start cut-&-pastable-section
% ****************************************************************



\paper {
  indent = 0\mm
  line-width = 160\mm
  % offset the left padding, also add 1mm as lilypond creates cropped
  % images with a little space on the right
  line-width = #(- line-width (* mm  3.000000) (* mm 1))
}

\layout {
  
}





% ****************************************************************
% ly snippet:
% ****************************************************************
\sourcefilename "snippets/adding-indicators-to-staves-which-get-split-after-a-break.ly"
\sourcefileline 0
%% DO NOT EDIT this file manually; it is automatically
%% generated from LSR http://lsr.di.unimi.it
%% Make any changes in LSR itself, or in Documentation/snippets/new/ ,
%% and then run scripts/auxiliar/makelsr.py
%%
%% This file is in the public domain.
\version "2.21.2"

\header {
%% Translation of GIT committish: a8a85e19654e46d725563e6deba44083ef137a2c
  texidocja = "
このスニペットは @code{\\splitStaffBarLine}, @code{\\convUpStaffBarLine},
@code{\\convDownStaffBarLine} コマンドを追加します。@c
これらは小節線に矢印を追加し、譜を共有するボイスが次のシステムで@c
譜を分ける場合、あるいは再度合流する場合の指示を表示します。
"
  doctitleja = "改行後に分かれる譜について、指示を表示する"

%% Translation of GIT committish: 7a89226d5472a2548ec19228d8bccee1bd2480b4
  texidocfr = "
Dans cet extrait sont définies les commandes @code{\\splitStaffBarLine},
@code{convUpStaffBarLine} et @code{convDownStaffBarLine}.  Ces commandes
ajoutent une double flèche après la dernière barre de mesure d'une portée,
indiquant par là que ses différentes voix disposeront de leur propre
portée à la ligne suivante.

"
  doctitlefr = "Ajout d'indicateurs à une portée dédoublée après un saut de ligne"

%% Translation of GIT committish: 0bed3bc9d8ad506e51c02faf95715e584e4bc335
  texidoces = "
Este fragmento de código define las instrucciones
@code{\\splitStaffBarLine}, @code{convUpStaffBarLine} y
@code{convDownStaffBarLine}, que añaden flechas en las sobre una línea
divisoria, para denotar que cada una de las voces que comparten un
pentagrama continúan en su propio pentagrama en el siguiente sistema,
o que las voces así divididas se recombinan.

"
  doctitlees = "Añadir indicadoes a los pentagramas que se dividen después de un salto de línea"

  lsrtags = "staff-notation, symbols-and-glyphs, vocal-music"

  texidoc = "
This snippet defines the @code{\\splitStaffBarLine},
@code{convUpStaffBarLine} and @code{convDownStaffBarLine}
commands.  These add arrows at a bar line, to denote that several
voices sharing a staff will each continue on a staff of their own in
the next system, or that voices split in this way recombine.

"
  doctitle = "Adding indicators to staves which get split after a break"
} % begin verbatim

#(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
}


\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
    }
  }
}



% ****************************************************************
% end ly snippet
% ****************************************************************
