Re: angle of a tuplet bracket

[Thomas Morley]

Hi Paolo,

2012/1/5 address@hidden <address@hidden>:
>
> On Jan 5, 2012, at 2:31 PM, Paolo Prete wrote:
>
> ... is there a way to specify the angle of a tuplet bracket?
>
> In addition, how can I force the bracket of the following tuplet:
>
> \times 2/3 {c' c'' c'''}
>
> so to be horizontal? (0 °)
>
>
> thanks!
>
>
> Hey Paolo,
>
> You can set the positions property.
>
> http://lilypond.org/doc/v2.15/Documentation/internals/tupletbracket
>
> To force it to be horizontal, just use the same two numbers.
>
> Cheers,
> MS

if you want to get explicit control about the angle of the
TupletBracket, you could try the function below. Sometimes there's
need of an offset in Y-direction depending on the angle you've chosen.
So I integrated the possibility to do so.

\version "2.15.20"

tupletAngles =
#(define-music-function (parser location y-off angl)(number? number?)
"
 angl is supposed to be the angle of the TupletBracket in degrees,
 y-off a (possible) offset in Y-direction
 "
#{
\once\override TupletBracket  #'after-line-breaking =
#(lambda (grob)
  (let* ((pos (ly:grob-property grob 'positions))
         (y-length (interval-length pos))
         (st (ly:tuplet-bracket::print grob))
         (st-x-ext (ly:stencil-extent st X))
         (st-x-length (interval-length st-x-ext))
         (alpha (degrees->radians angl))
         (new-start (+ (car pos) y-off))
         (new-y (* st-x-length (tan alpha))))
  (ly:grob-set-property! grob 'positions (cons new-start (+ new-start new-y)))))
#})

%----- test

\relative c' {
        \tupletAngles #-0.3 #15
        \times 2/3 {c c' c'}
        \tupletUp
        \tupletAngles #0.9 #-30
        \times 2/3 {c c, c,}
}

Cheers,
  Harm