Hi again,
I didn't actually tell what the engraver is actually for:
The "autoTranspose"-engraver transposes music automatically, if there
are three context-properties set:
* instrumentTransposition is the pitch, which is set by \transposition
* music-concert-pitch tells whether the music in this context is
provided in concert-pitch (boolean)
* print-concert-pitch tells whether the music shall be printed in
concert-pitch (boolean)
Now, if you set music-concert-pitch to #t and print-concert-pitch to #f,
the music is transposed by instrumentTransposition. There are no extra
transpose{}-constructs needed and \instrumentSwitch may set
'instrumentTransposition.
Cheers, Jan-Peter
Am 12.05.2014 11:16, schrieb Jan-Peter Voigt:
> Hi there,
>
> I read a few of the messages regarding the given subject. I don't have a
> once-and-for-all-solution, but I want bring in another scheme-engraver:
>
> It uses context-properties 'instrumentTransposition, (newly defined)
> 'music-concert-pitch' and 'print-concert-pitch'. If the music in the
> staff is in concert-pitch, but it shall be displayed in
> instrument-pitch, it is transposed from concert-pitch to
> instrument-pitch and vice versa. The transposition is done on
> note-events and key-change-events. Propably the engraver needs to listen
> to a few more.
>
> Two problems:
> 1. If the music is in instrument-pitch and shall be displayed in
> concert-pitch, the transposition is still active - so the midi is wrong
> 2. The engraver doesn't create a key-signature yet, if
> 'instrumentTransposition changes.
>
> Now, what do you think?
>
> Best, Jan-Peter
\version "2.18.2"
% taken from "scm/define-context-properties.scm"
#(define (translator-property-description symbol type? description)
(if (not (and
(symbol? symbol)
(procedure? type?)
(string? description)))
(throw 'init-format-error))
(if (not (equal? #f (object-property symbol 'translation-doc)))
(ly:error (_ "symbol ~S redefined" symbol)))
(set-object-property! symbol 'translation-type? type?)
(set-object-property! symbol 'translation-doc description)
(set! all-translation-properties (cons symbol all-translation-properties))
symbol)
% add context properties descriptions
% music-concert-pitch
% print-concert-pitch
#(translator-property-description 'music-concert-pitch boolean? "music is in concert pitch")
#(translator-property-description 'print-concert-pitch boolean? "print it in concert pitch")
% engraver to automatically transpose music
autoTranspose =
#(lambda (context)
(let ((base (ly:make-pitch 0 0 0)) ; pitch c'
(lasttransp (ly:context-property context 'instrumentTransposition))) ; last instrument transposition
(define (cond-transp engraver music)
(let ((mcp (ly:context-property context 'music-concert-pitch)) ; music is in concert-pitch t/f
(pcp (ly:context-property context 'print-concert-pitch)) ; print it in concert-pitch t/f
(transp (ly:context-property context 'instrumentTransposition)) ; instrument transposition
(keysig (ly:context-property context 'keySignature)) ; key-signature
(tonic (ly:context-property context 'tonic))) ; key-signature tonic
(define (do-transp m)
(cond
; music in concert-pitch / display in instrument pitch
((and mcp (not pcp) (ly:pitch? transp))
(ly:music-transpose m (ly:pitch-diff base transp)))
; music in instrument pitch / display in concert pitch
((and (not mcp) pcp (ly:pitch? transp))
(ly:music-transpose m transp))
))
; TODO: if instrument transposition changed, produce key signature
(if (not (equal? transp lasttransp))
(let ((key-sig (make-music 'KeyChangeEvent 'pitch-alist keysig 'tonic tonic)))
(ly:broadcast (ly:context-event-source context)
(ly:make-stream-event 'key-change-event `((music-cause . ,key-sig)) ))
))
(set! lasttransp transp)
; execute transposition
(do-transp music)
))
; create engraver
(make-engraver
(listeners
; transpose note-event
((note-event engraver event)
(cond-transp engraver (ly:event-property event 'music-cause)))
; transpose key-signature
((key-change-event engraver event)
(cond-transp engraver (ly:event-property event 'music-cause)))
)
)
))
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%% demo music
bach = \relative c'' { bes a c b }
\addInstrumentDefinition #"eb-clarinet"
#`((instrumentTransposition . ,(ly:make-pitch 0 2 -1/2))
(shortInstrumentName . "Es-Kl")
(clefGlyph . "clefs.G")
(middleCPosition . -6)
(clefPosition . -2)
(instrumentCueName . "Es-Kl")
(midiInstrument . "clarinet"))
\addInstrumentDefinition #"b-clarinet"
#`((instrumentTransposition . ,(ly:make-pitch -1 6 -1/2))
(shortInstrumentName . "Kl")
(clefGlyph . "clefs.G")
(middleCPosition . -6)
(clefPosition . -2)
(instrumentCueName . "Kl")
(midiInstrument . "clarinet"))
%%% demo score
\score {
\new Staff \with {
\remove "Key_engraver"
\consists #autoTranspose
\consists "Key_engraver"
} {
% if music and print are equal, do nothing
% else transpose according to transp (up or down)
\set Staff.music-concert-pitch = ##t
\set Staff.print-concert-pitch = ##f
% if music is given in instrument-pitch, but shall be printed in concert-pitch,
% midi pitch is false - instrumentTransposition should be "turned off" for midi(?)
\key f \major
\bach
\instrumentSwitch "b-clarinet"
\bach
\instrumentSwitch "eb-clarinet"
\bach
}
\layout {}
\midi { \tempo 4=120 }
}
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