On 5 February 2010 00:18, Neil Puttock <n.putt...@gmail.com> wrote:
> Yes (see attached file). I had to move the markup outside the
> 'finalize method though, since it wouldn't evaluate it directly.
I've come to the conclusion using an engraver is a waste of time; its
only benefit is that the storage of the pitches/key signature is
simpler. I think combining my original approach of a music function
with some extra listener code is better, since it allows scores in a
book to have separate ambitus.
\version "2.13.14"
\header { }
ambitus =
#(define-music-function (parser location music) (ly:music?)
(define (add-stream-listener global listener . types)
(apply ly:add-listener
(cons* listener (ly:context-events-below global) types))
global)
(define (process-event event)
(case (ly:event-property event 'class)
((note-event)
(set! pitches (cons (ly:event-property event 'pitch) pitches)))
((key-change-event)
(and (null? key-list)
(set! key-list (ly:event-property event 'pitch-alist))))
((Finish)
(set! pitches (stable-sort pitches ly:pitch<?))
(if $defaultheader
(module-define! $defaultheader 'ambitus
(ambitus-markup key-list pitches))))))
(define (ambitus-markup key pitches)
(let* ((music (make-sequential-music
(list (make-time-signature-set 2 4)
(make-grob-property-set 'TimeSignature
'stencil #f)
(make-music
'KeyChangeEvent
'pitch-alist key)
(make-event-chord
(list (make-music
'NoteEvent
'duration (ly:make-duration 2 0 1 1)
'pitch (first pitches))))
(make-event-chord
(list (make-music
'NoteEvent
'duration (ly:make-duration 2 0 1 1)
'pitch (last pitches)))))))
(score (ly:make-score music))
(layout (ly:output-def-clone $defaultlayout)))
(ly:output-def-set-variable! layout 'indent 0)
(ly:score-add-output-def! score layout)
(make-score-markup score)))
(ly:parser-define! parser 'pitches '())
(ly:parser-define! parser 'key-list '())
(let* ((global (ly:make-global-context $defaultlayout))
(listener (ly:make-listener process-event))
(global-disp (ly:context-events-below global)))
(ly:connect-dispatchers (ly:make-dispatcher) global-disp)
(add-stream-listener global listener 'note-event 'key-change-event 'Finish)
(ly:interpret-music-expression music global)
music))
\new Staff \ambitus \relative c'' {
\key g \major
g8 a b c d e fis g
a1
}
Cheers,
Neil
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