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RE: Tweaking in an engraver
From: |
Peter Gentry |
Subject: |
RE: Tweaking in an engraver |
Date: |
Sun, 19 Jul 2015 18:12:31 +0100 |
The OP described wanting to tweak a note property depending on its pitch. Now I
may be missing something but do you need to create
an engraver for this.
My instrumentranges.ly examines note pitch an based on a suplied criterion
changes notehead colour and style - is this the sort of
thing you had in mind.
\version "2.19.15"
%
-------------------------------------------------------------------------------------------------
% include function file instrument_ranges.ly
% usuage include --> \include "./ranges/instrument_ranges.ly"
% usuage call --> \naturalizeInstrumentRange "instrument" music
% this function will confine all pitches to the individual instruments range
% Note the ranges refer to music transposed for each instrument not the true
pitches.
% use % for comment outside scheme function - use ; inside scheme functions
%
-------------------------------------------------------------------------------------------------
#(define (naturalize-instrument-range p instrument )
(let ((o (ly:pitch-octave p))
(a (* 4 (ly:pitch-alteration p)))
;; alteration, a, in quarter tone steps, for historical reasons
(n (ly:pitch-notename p)))
(define np 0)
(define op (+ (+ (+ (* 14 o) ) (* n 2) ) (/ a 2)))
;; clarinet range e to f' -1 2 0 to 1 3 0 (-11 to 20)
(cond
((equal? instrument "clarinet" )
(if (< op -38) (begin (set! o (+ o 1))) )
(if (< op -24) (begin (set! o (+ o 1))) )
(if (< op -10) (begin (set! o (+ o 1))) )
(if ( > op 62) (begin (set! o (- o 1))) )
(if ( > op 48) (begin (set! o (- o 1))) )
(if ( > op 34) (begin (set! o (- o 1))) )
)
; bass clarinet range eb to f' -1 1 2 (-1 2 -2) to 1 3 0 (-11 to 34)
((equal? instrument "bass clarinet eb" )
(if (< op -39) (begin (set! o (+ o 1))) )
(if (< op -25) (begin (set! o (+ o 1))) )
(if (< op -11) (begin (set! o (+ o 1))) )
(if ( > op 62) (begin (set! o (- o 1))) )
(if ( > op 48) (begin (set! o (- o 1))) )
(if ( > op 34) (begin (set! o (- o 1))) )
)
; bass clarinet range c to f' -1 1 2 (-1 2 -2) to 1 3 0 (-14 to 34)
((equal? instrument "bass clarinet c" )
(if (< op -42) (begin (set! o (+ o 1))) )
(if (< op -28) (begin (set! o (+ o 1))) )
(if (< op -14) (begin (set! o (+ o 1))) )
(if ( > op 62) (begin (set! o (- o 1))) )
(if ( > op 48) (begin (set! o (- o 1))) )
(if ( > op 34) (begin (set! o (- o 1))) )
)
;; flute range c to f' 0 0 0 to 1 3 0 (0 to 34)
((equal? instrument "flute")
(if (< op -28) (begin (set! o (+ o 1))) )
(if (< op -14) (begin (set! o (+ o 1))) )
(if (< op 0) (begin (set! o (+ o 1))) )
(if ( > op 62) (begin (set! o (- o 1))) )
(if ( > op 48) (begin (set! o (- o 1))) )
(if ( > op 34) (begin (set! o (- o 1))) )
)
;; alto range d to f' 0 1 0 to 1 3 0
((equal? instrument "alto")
(if (< op -28) (begin (set! o (+ o 1))) )
(if (< op -14) (begin (set! o (+ o 1))) )
(if (< op 0) (begin (set! o (+ o 1))) )
(if ( > op 62) (begin (set! o (- o 1))) )
(if ( > op 48) (begin (set! o (- o 1))) )
(if ( > op 34) (begin (set! o (- o 1))) )
) )
(ly:make-pitch o n (/ a 4))
))
%
-------------------------------------------------------------------------------------------------
% a variable for the notehaed color on pitch change
%
-------------------------------------------------------------------------------------------------
my-color = #(x11-color 'red)
%
-------------------------------------------------------------------------------------------------
% this function rebuilds the music object optionally changing pitch and
notehead color
%
-------------------------------------------------------------------------------------------------
#(define (instrumentrange music instrument )
( ly:music? string? )
; extract the various portions of the music object
(let ((es (ly:music-property music 'elements))
(e (ly:music-property music 'element))
(p (ly:music-property music 'pitch)))
; rebuild any 'elements unchanged
(if (pair? es)
(ly:music-set-property! music 'elements
(map (lambda (x) (instrumentrange x instrument)) es)))
; rebuild any 'element unchanged
(if (ly:music? e) (ly:music-set-property! music 'element
(instrumentrange e instrument )))
;rebuild the pitch and if a changed pitch add the color tweak
(if (ly:pitch? p)
(let ((new-pitch (naturalize-instrument-range p instrument)))
(ly:music-set-property! music 'pitch new-pitch)
(if (and (not (equal? p new-pitch)) (color? my-color))
(ly:music-set-property! music 'tweaks
(acons
'color my-color
(acons 'style 'harmonic
(ly:music-property music 'tweaks)))))))
music))
naturalizeInstrumentRange =
#(define-music-function (parser location instrument m )
( string? ly:music? )
(instrumentrange m instrument ))
%
-------------------------------------------------------------------------------------------------
% the Lily test file calling function \naturalizeInstrumentRange "flute"
followed by sequential music
%
-------------------------------------------------------------------------------------------------
\score {
\naturalizeInstrumentRange "flute"
\new Staff \relative c' {
c,,8 cis des d dis ees e eis fes f fis ges g gis aes a ais bes b bis ces
c8 cis des d dis ees e eis fes f fis ges g gis aes a ais bes b bis ces
c8 cis des d dis ees e eis fes f fis ges g gis aes a ais bes b bis ces
c8 cis des d dis ees e eis fes f fis ges g gis aes a ais bes b bis ces
c8 cis des d dis ees e eis fes f fis ges g gis aes a ais bes b bis ces
c8 cis des d dis ees e eis fes f fis ges g gis aes a ais bes b bis ces
}
}
\score {
\new Staff \relative c' {
c,,8 cis des d dis ees e eis fes f fis ges g gis aes a ais bes b bis ces
c8 cis des d dis ees e eis fes f fis ges g gis aes a ais bes b bis ces
c8 cis des d dis ees e eis fes f fis ges g gis aes a ais bes b bis ces
c8 cis des d dis ees e eis fes f fis ges g gis aes a ais bes b bis ces
c8 cis des d dis ees e eis fes f fis ges g gis aes a ais bes b bis ces
c8 cis des d dis ees e eis fes f fis ges g gis aes a ais bes b bis ces
}
}