Re: Slur over a single note

[Thomas Morley]

Am Mo., 25. Feb. 2019 um 12:04 Uhr schrieb Urs Liska <address@hidden>:
>
> Hi,
>
> I'm in need of an idea how to approach this: I need to print a slur over a 
> single note.
>
> More concretely there already is a markup with a certain width above the note 
> (see attached image), and I need to print a slur over that markup (see second 
> attached image).
>
> It should be possible (I think) to hook into the stencil callback, take the 
> markup stencil and produce a new slur stencil from scratch. But until now I 
> have only taken an existing slur stencil and worked with that, so I'm at a 
> loss as to how I can add a new slur stencil to the existing one.
>
> I've come to the point where I can access the markup as a stencil in the 
> "stencil" override. From here I want to add an additional slur stencil, 
> aligned to that markup stencil and add it to the whole resul.
>
> Any pointers would be welcome
> Urs
>
> \version "2.21.0"
>
> #(define (tremulo-type? obj)
>    (and (symbol? obj)
>         (memq obj '(slow accel fast))))
>
> tremulo =
> #(define-event-function (type)(tremulo-type?)
>    (let*
>     ((markups
>       `((accel .
>           ,#{
>             \markup \concat {
>               \fontsize #1
>               \musicglyph "scripts.prall"
>               \fontsize #-1
>               \musicglyph "scripts.prallprall"
>             }
>           #})))
>      ;; store the actually used markup in a closure
>      (use-markup (assq-ref markups type)))
>     #{
>       \tweak stencil
>       #(lambda (grob)
>          (let*
>           ((tremulo-stencil (grob-interpret-markup grob use-markup))
>            )
>            ; TODO:
>            ; Create slur stencil and add/align it above the tremulo
>            tremulo-stencil
>            ))
>       ^\markup ""
>     #}
>     ))
>
> {
>   c''1 \tremulo accel
> }

Hi Urs,

can't look deeper into it, have to run for my regular job...

Though, there are the under/overtie-markup-commands, customizable like
the tie-markup.command.
Probably better to use tie-markup directly, it respects 'direction
from parent-grob.


Cheers,
  Harm