Re: Overwrite key signature with numbers

[Valentin Petzel]

Am Dienstag, 3. Oktober 2023, 12:55:21 CEST schrieb Robert Mengual:

> Thanks a lot Valentin, that's simply perfect!

>

> However, after reading a lot of the documentation I think I would have

> never been able to find any solution close to yours. I am very confused

> with a few things, and I can't find the answers in the documentation. Let

> me ask you a few questions in hope that I will be able to solve problems on

> my own next time.

Hello Robert,

I do understand that getting into details for a oftware like lilypond can be a bit hard. Since it is a small open source project it is not perfectly documented in each regard, especially once you start to go into extending it. I’d recommend reading Jean’s introduction into extending lilypond:

https://extending-lilypond.gitlab.io/

Once you’ve seen these things a few times it will become a lot easier (I did take some time to get where I am now, and it would have been much less if I had something like Jean’s guide).

>    - How did you know you could pass a function that receives a grob to

>    KeySignature.key?

(Raw) grob properties can be either values or callbacks, which are functions that take the grob itself as argument (these are automatically evaluated when getting the property). You doing

\override KeySignature.stencil = #ly:text-interface::print

is assingning a function to the stencil property.

>    - If an overriden property expects a number, can it be defined as a

>    function that receives a grob and returns a number?

Exactly.

>    - How did you know alterations-alist is a property of that grob?

https://lilypond.org/doc/v2.24/Documentation/internals/key_002dsignature_002dinterface

>    - What is #:vcenter and how did you know of its existence?

markup command for vertically centering stuff (relative to itself), see here:

https://lilypond.org/doc/v2.24/Documentation/notation/align

Using this the number will not extend from the middle line upward, but be centered around the middle line.

Cheers,

Valentin

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