Re: Moving tuplet number

[David Nalesnik]

Hi Harm, Andrew--

On Mon, Mar 30, 2015 at 10:45 AM, Thomas Morley <address@hidden> wrote:

Hi Andrew,

2015-03-30 17:06 GMT+02:00 David Nalesnik <address@hidden>:
> Hi Andrew,
>
> On Mon, Mar 30, 2015 at 9:11 AM, Andrew Bernard <address@hidden>
> wrote:
>>
>> How can you move a tuplet number to a different position relative to the
>> centre of the bracket, say 75% along rather than 50%?
>>
>> I can use X-offset for the TupletNumber, but this reveals the gap in the
>> bracket that is the room for the number. How does one move that as well?
>
>
> Sorry, I don't believe that this is possible in any convenient way.   The
> routine that draws the tuplet bracket simply puts the gap halfway along,
> regardless of the number's position.  Fixing this would involve patching the
> C++ code.
>
> You could instead write a Scheme callback for TupletBracket.stencil which
> would use the tuplet number's X-extent to determine the gap's position.
> You'd of course have to reconstruct the bracket from scratch.
>
> --David

not sure what you aim at. An example is always helpful, especially for
a none native speaker like me. ;)

He's wanting to move the number along the bracket and have the gap go with it.  Right now the gap is always dead center.

 

Though, maybe the following may help:

\version "2.19.17"

\relative c' {
    \override TupletNumber.Y-offset =
    #(lambda (grob)
      (let ((dir (ly:grob-property grob 'direction)))
       (+ (ly:tuplet-number::calc-y-offset grob)
          (* dir 0.75))))

    \override TupletNumber.X-extent = #empty-interval

    %\voiceTwo
    %\voiceOne
    \times 2/3 {
        c2 c c
    }
}

Thanks, Harm--this gives me an idea!  Draw an unbroken bracket as you do above, then add a whiteout box to the TupletNumber:

 \version "2.19.17"

\relative c' {

  \override TupletNumber.X-extent = #empty-interval

  \override TupletNumber.stencil =

  #(lambda (grob)

     (let* ((stil (ly:tuplet-number::print grob))

            (stil-X (ly:stencil-extent stil X))

            (stil-X (interval-widen stil-X 0.5))

            (stil-Y (ly:stencil-extent stil Y))

            (box (make-transparent-box-stencil stil-X stil-Y))

            (whiteout (stencil-whiteout box)))

       (ly:stencil-add whiteout stil)))

  \offset X-offset 1 TupletNumber

  \times 2/3 {

    c2 c c

  }

  \offset X-offset -1 TupletNumber

  \times 2/3 {

    c2 c' e

  }

}

%%

--David