Re: vertical ordering of a custom event-function markup

[Aaron Hill]

On 2018-10-09 7:54 am, Urs Liska wrote:
> Hi,
>
> I have a custom \path markup, implemented as an event function.
>
> This works well, but when I add a slur I don't manage to get it to
> behave it properly. What I want is to print the vertical lines and
> then outside the slur, just like with the staccatissimo. But there
> will first be the slur and then the "articulation". So far I haven't
> found out how to manage that. avoid-slur doesn't seem to have any
> effect, and when I override outside-staff-priority I only get to a
> point where the two lines are incorrectly aligned vertically.
>
> Any suggestions how I can print these lines like an ordinary 
> articulation?
>
> Thanks
> Urs
>
> %%%
>
> \version "2.19.82"
>
> indicator =
> #(define-event-function ()()
>    #{
>      \tweak X-offset 0.75
>      -\markup \path #0.17 #'((moveto 0 0) (lineto 0 0.75))
>    #})
>
> \relative {
>   %\override TextScript.avoid-slur = #'inside
>   d''4 e8 [ ^\indicator ( e ] ^\indicator )
>   d8 [ -. ( d ] -. )
> }
>
> %%%

LSR shows using \tweak stencil as a way to override the appearance of an 
articulation for doing something custom:

%%%%
indicator = \tweak stencil
  #(lambda (grob) (grob-interpret-markup grob
    #{ \markup \path #0.17 #'((moveto 0.75 0) (lineto 0.75 0.75)) #}))
  \stopped
%%%%

Of course, this doesn't help with the custom event function.  Consider 
this:

%%%%
\version "2.19.82"

indicator = #(define-event-function ()()
  #{ -\markup \with-dimensions #'(0 . 0) #'(0 . 0.75)
      \path #0.17 #'((moveto 0.75 0) (lineto 0.75 0.75)) #})

\relative {
  \override TextScript.outside-staff-priority = #0
  \override Slur.outside-staff-priority = #1
  d''4 e8 [ ^\indicator ( e ] ^\indicator )
  d8 [ -. ( d ] -. )
}
%%%%

If you allow the markup to have any width (e.g. try "#'(0 . 1e-14)"), it 
seems to break things.

-- Aaron Hill