"Wild" Harp Glisses

[Yoshiaki Onishi]

> Engraving a musical theater score and I've got a handful of spots that have 
> some ad lib./"wild" harp glisses (as seen in the example images below.) Does 
> anyone have a good reliable/reusable way to engrave these without needing to 
> manually adjust the positions of the glissando spans for every single 
> instance? I've got more than just two situations where this is used, so I'm 
> thinking some kind of function or engraver, but I'm still getting comfortable 
> with extending LilyPond and writing those kinds of things.
> 

Dear Steph,

I am not sure if you have been helped here or if you figured something out. But 
in case none of that has happened yet:

I see this as an excellent opportunity to become more familiar with Scheme, as 
well as Postscript (I do know, however, that the LilyPond manual states that 
the Postscript should be used as the last resort when making a markup…). With 
that in mind, in the attached .ly file, you will see two examples. Both 
examples draw a same squiggly line using Postscript code via \markup, which is 
then attached to the notehead via grob-transformer, attached to 
NoteHead.stencil. 

First example is a hard-coded one where you can invoke the variable and it 
would draw the same shape every time you do so. 

The second example shows a possibility where you can add arguments to alter 
some parameters in the Postscript code, taking advantage of some Scheme 
functions. In that example, I decided to turn the thickness of the line as an 
argument. This means that, depending on what kind of arguments you set, you can 
change the shape of the curve, you can set how many curves you want, how long 
the line as a whole should be, etc. etc.. 

This was the approach I took in one of the snippets (Slashed Notehead) I made 
as part of the contemporary notation cookbook I announced in the mailing list a 
few days ago. And I took the inspiration for that from a code that Jean Abou 
Samra made in this thread:

https://lists.gnu.org/archive/html/lilypond-user/2022-11/msg00333.html

Good luck!!!!
Yoshi

squiggly.ly
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