Thanks, David.
@Vaughan
For a short test ... this compiles, but I can't listen to the resulting
pan in midi ....
I changed the PropertySet to ApplyContext with a lambda. This should
work in variables, as it returns an applyContext expression.
As with the previous solution, you have to care about the order autopan
is called.
It might be a good idea to either use a performer (engraver in midi
context) and/or to track context id's, so that each context is counted once.
HTH, Jan-Peter
On 27.01.2014 15:15, David Kastrup wrote:
> Jan-Peter Voigt <jp.vo...@gmx.de> writes:
>
>> Hi Vaughan,
>>
>> if global is a music-function calling autopan, it will evaluate it
>> everytime. If global is a variable, its value is set, once it is assigned.
>> So if you have to wrap it in music-function. If you always have a
>> variable "global" containing all you need, you can wrap that in a function:
> I'd recommend putting this into an \applyContext call. That way, you
> get a call for each use in a different context.
>
\version "2.18.0"
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%{
Auto panner
Spreads voices evenly from -1 (LEFT) to 1 (RIGHT)
Usage:
\include "autopanner.ly"
\SetTotalAutopanStaves #2 % or \SetTotalAutopanVoices
\score {
<<
\new Staff <<
\set Staff.midiInstrument = #"violin"
\autopan
{ ... music here }
>>
\new Staff <<
\set Staff.midiInstrument = #"cello"
\autopan
{ ... music here }
>>
>>
}
%}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
#(define autopan-total-voices 2.0)
#(define autopan-current-voice -1.0)
#(define autopan-staff-or-voice 'Staff)
ResetAutoPanning =
#(define-void-function
(parser location)
()
(set! autopan-current-voice -1.0)
)
SetTotalAutopanVoices =
#(define-void-function
(parser location total-voices)
(number?)
(begin
(set! autopan-total-voices total-voices)
(set! autopan-current-voice -1.0)
(set! autopan-staff-or-voice 'Voice)
)
)
SetTotalAutopanStaves =
#(define-void-function
(parser location total-voices)
(number?)
(begin
(set! autopan-total-voices total-voices)
(set! autopan-current-voice -1.0)
(set! autopan-staff-or-voice 'Staff)
)
)
autopan =
#(define-scheme-function (parser location)()
(begin
(set! autopan-current-voice (+ autopan-current-voice 1.0))
(make-music
'ApplyContext
'procedure
(lambda (context)
(let ((ctx (ly:context-find context autopan-staff-or-voice)))
(if (not (ly:context? ctx)) (set! ctx context))
;(ly:message "context ~A" ctx)
(ly:context-set-property! ctx 'midiPanPosition
(+ -1.0
(* autopan-current-voice
(/ 2.0
(- autopan-total-voices 1.0)
)
)
)))
))
))
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