Re: Note duration line (contemporary)

[Thomas Morley]

2012/11/28 Jeffrey Trevino <address@hidden>:
> Hi all,
>
> It's good to know how to do this. For metric notation, I found that it's
> also useful to stop the duration line before the barline, instead of
> continuing it to a subsequent notehead, if the following note is in the next
> bar:
>
>
> #(define flat-gliss
>   (lambda (grob)
>     (let ((left-Y (assoc-get 'Y (ly:grob-property grob 'left-bound-info))))
>       (ly:grob-set-nested-property! grob '(right-bound-info Y) left-Y))))
>
> \relative c'' {
>   \override Glissando #'after-line-breaking = #flat-gliss
>   \override Glissando #'thickness = #8
>   \override Glissando #'to-barline = ##t
>
>   c1\glissando
>   g'\glissando
>   g,
> }
>
> There's one more important tweak, remaining, though, and I can't figure it
> out: Is there a way to make the ends of the lines square instead of round? I
> don't see a property for this in line-interface.
>
> best,
> Jeff

AFAIK, there is none.
But you can construct a new stencil via `make-filled-box-stencil´

\version "2.17.6"

#(define flat-gliss
  (lambda (grob)
    (let* ((left-Y (assoc-get 'Y (ly:grob-property grob 'left-bound-info)))
           (stencil (ly:line-spanner::print grob))
           (stencil-x-ext (ly:stencil-extent stencil X))
           (line-thickness (ly:staff-symbol-line-thickness grob))
           (staff-space (ly:staff-symbol-staff-space grob))
           (half-gliss-thick (- (/ staff-space 2) line-thickness))
           (new-stencil (make-filled-box-stencil
                        (interval-widen stencil-x-ext (* line-thickness 1))
                        (interval-widen (cons left-Y left-Y) 
half-gliss-thick))))

          (ly:grob-set-property! grob 'stencil new-stencil)
          (ly:grob-set-nested-property! grob '(right-bound-info Y) left-Y))))

\relative c'' {
  \override Glissando #'after-line-breaking = #flat-gliss
  \override Glissando #'to-barline = ##t

  c1\glissando
  g'\glissando
  g,
  f'2\glissando
  e'
}

Please note: I hardcoded the Glissando-thickness depending on
staff-space and staff-symbol-line-thickness.
This could be done for 'to-barline, too.
Or create a function to gain more flexibility.

Cheers,
  Harm