Re: Drawing an Oval around a group of notes

[John Zeweniuk]

Thank you all for the responses on this question.  I’m super impressed by the 
quickness and quality of the replies.  I ended up using the solution provided 
by Klaus.  I had figured out that modifying a Horizontal Bracket Engraver would 
be a good way to go, but hadn’t figured out how to create my own stencil, 
drawing in it how I pleased.  Klaus's solution works perfectly!

cheers,

John

> On Oct 30, 2016, at 4:30 PM, Robin Bannister <address@hidden> wrote:
> 
> John Zeweniuk wrote:
>> Can anybody give me some suggestions  of how I would draw an oval around a 
>> group of notes on the staff?
> 
> 
> For the special case of a single chord, see the german thread
> http://www.lilypondforum.de/index.php?topic=378
> 
> 
> The 2.18 version of this would read
> %%%%%%%%%%
> kringel =
> \once \override NoteColumn.stencil = #(lambda (grob)
>  (let* ((xext (ly:grob-extent grob grob X))
>            (yext (ly:grob-extent grob grob Y))
>         (xpos (interval-index xext CENTER))
>         (ypos (interval-index yext CENTER))
>            (yrad (* 0.8 (interval-length yext)))
>         (xrad (min (interval-length xext) 2))
>         (thickness 0.05))
>    (ly:stencil-add
>     (ly:stencil-translate
>      (ly:make-stencil (list 'ellipse xrad yrad thickness #f))
>      (cons xpos ypos)) )))
> %%%%%%%%%%
> 
> 
> Cheers,
> Robin
> <kringel218.png>