Re: invisible noteheads

[Richard Shann]

On Tue, 2023-09-05 at 09:50 -0700, Donald J. Stewart wrote:
> https://lilypond.org/doc/v2.24/Documentation/notation/expressive-marks-as-lines
> 
Ah, right, that explains it - in your email you suggested 

\once \hide Notehead

which doesn't work, it has to be NoteHead.

You can insert this syntax using the command:

Command: Insert Lilypond
Insert or edit a directive in the LilyPond music typesetting language.
This can be used for extra spacing, transposing or almost anything. See
LilyPond documentation for ideas.
Location: Object Menu ▶ Directives
Internal Name: InsertStandaloneDirective

To have it readily available you could double click on the directive
and start the Object Editor and choose "Create Button for Clone" which
would give you a button in a palette for inserting it in future.
However it would be much better if it were *not* a standalone directive
but rather attached to the note.

To do that use the command:

Command: Attach/Edit LilyPond to Note
Inserts LilyPond syntax you give before and after the note at the
cursor height, also allows editing/deleting.
Location: Object Menu ▶ Notes/Rests ▶ Directives
Internal Name: InsertNoteDirective

and put 

\once \hide Notehead

before the note. Then as before you can create a button to insert this
syntax.

Which brings us to the starting point, the command

Command: (Print) Hide Object
Hides the object at cursor position with a lilypond directive.
Currently only Notes and the three Signatures. No rests!
Location: Object Menu ▶ Directives ▶ Typesetter
Internal Name: Hide

This command was not doing what its Help says it does. Looking at the
history of it in the repository it seems something is corrupted. I've
restored it to what I suspect was the original script. It now does do
what it says (although hiding a note is limited to hiding the notehead
and not the stem). This was clearly an unfinished project, to create a
command that would hide any type of LilyPond object. As such I think it
was misguided, not least because the directive created is closely
linked to the object that follows it and can't be moved elsewhere with
any reliable result.

I think it should be retired.

HTH

Richard

> I found the command under 'Adding timing marks to long glissandi'.
> 
> I've been applying small changes to an example that I previously
> submitted. I've tested these changes both in Denemo and Frescobaldi.
> 
> One thing to note in Denemo, is that changes made in the 'Advanced'
> tab under Object editor seem to work better than attempts to change
> it in the Lilypond Text Editor.
> 
>  \once\hide NoteHead also creates the proper spacing for 'hidden'
> noteheads.
> 
> I've attached the small Denemo example before and after changing the
> \once\hide\NoteHead command
> 
> On Tuesday, September 5, 2023 12:56:12 AM PDT Richard Shann wrote:
> > On Mon, 2023-09-04 at 16:35 -0700, Donald J. Stewart wrote:
> > > I just discovered (late to the party as usual) the Lilypond
> > > directive:
> > > 
> > > \once \hide Notehead
> > 
> > Can you give the URL of the location in the lilypond documentation
> > where you found this syntax? If you simply insert this before a
> > note
> > you get an error message from LilyPond.
> > 
> > Richard
> 
>