Re: vertical ordering of a custom event-function markup

[Urs Liska]

Hi Aaron,


Am 09.10.2018 um 18:55 schrieb 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
> %%%%

This is (to some extent) semantically problematic because it essentially 
abuses another articulation (here \stopped). But after some tests it 
seems to do exactly what I need, and I will use that solution. Thank you 
very much for that!

> 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.

This doesn't produce really nice spacing (actually the lines nearly 
clash with the slur). And I don't need the event function in the first 
place, I only need the articulation.

Best
Urs

> -- Aaron Hill
>
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