On Sat, 2017-01-14 at 18:14 +0000, J Martin Rushton wrote:
> Hi,
> I'm trying to set a melody from a 19thC source as closely as possible to
> the original. Triplets are indicated with a curved bracket rather than
> the square one Lily uses by default. I've come up with a mechanism:
>
> \relative c'' {
> \tupletUp
> \override TupletBracket.bracket-visibility = ##f
> \tuplet 3/2 { c8( c c ) }
> }
>
> but using a slur in this way seems wrong. Is there a better way?
yes!
> I'm
> using Lily 2.14 in this instance.
That might be a problem. The solution lies in some code posted a month
or two back on this list:
tupletBracketToSlur = {
% Use slur-stencil
\\override TupletBracket.stencil = #ly:slur::print
%% Use 'thickness from Slur
\\override TupletBracket.thickness = #1.2
%% 'control-points need to be set
\\override TupletBracket.control-points =
#(lambda (grob)
(let* ((x-pos (ly:grob-property grob 'X-positions))
(pos (ly:grob-property grob 'positions))
(x-ln (interval-length x-pos))
(dir (ly:grob-property grob 'direction))
;; read out the height of the TupletBracket, maybe
negative!
(height (- (cdr pos) (car pos)))
;; height-corr is introduced because sometimes the shape of
the
;; slur needs to be adjusted.
;; It is used in the 2nd/3rd control-point.
;; The value of 0.3 is found by trial and error
(height-corr (* 0.3 dir height))
(edge-height (ly:grob-property grob 'edge-height '(0.7 .
0.7)))
(pad 1.0))
(list
;; first cp
(cons
(+ (car x-pos) 0.5)
(- (+ (* dir pad) (+ (car pos) (* -1 dir (car
edge-height))))
(if (= dir -1)
(if (> height 3)
(/ dir 2.0)
0.0)
(if (< height -3)
(/ dir 2.0)
0.0))))
;; second cp
(cons
(+ (car x-pos) (* x-ln 1/4))
(+ (* dir pad) (+ (car pos) (* dir (+ 0.5 height-corr)))))
;; third cp
(cons
(+ (car x-pos) (* x-ln 3/4))
(+ (* dir pad) (+ (cdr pos) (* dir (- 0.5 height-corr)))))
;; fourth cp
(cons
(- (cdr x-pos) 0.5)
(+ (* dir pad) (+ (cdr pos) (* -1 dir (cdr edge-height)))))
)))
\\override TupletBracket.staff-padding = #'()
#(define (invert-direction x) (if (eq? UP
(ly:tuplet-bracket::calc-direction x)) DOWN UP))
\\override TupletBracket.direction = #invert-direction
}
then you put \tupletBracketToSlur in a \layout{ } block.
I've just cut-and-pasted this codefrom the command in Denemo that
inserts this stuff for you.
Richard
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