I have to admit that I'm stuck here.
I see some documentation for gros here:
http://lilypond.org/doc/v2.11/Documentation/user/lilypond-internals/grob_002dinterface#grob_002dinterface
but I don't know where to start. Do you have a suggested URL?
"Han-Wen Nienhuys" <address@hidden> writes:
> It would be the coolest if (all) these extensions could happen in
> grob-property space.
> This could be done by automatically overriding and reverting grob
> properties when middleCPosition or tonic context properties change.
>
> 2007/4/21, Kevin Dalley <address@hidden>:
>> As another step toward in my path toward varying notation in LilyPond,
>> I am varying note shapes by semitone. Usually, there are fewer than
>> 12 note heads, but the semitone of the note determine the shape.
>>
>> My current implementation uses a function shapeLayoutFunction which
>> returns an integer, which is an index into the vector
>> shapeNoteStyles. This seems to work. The function description is:
>>
>> Function returning an integer which indexes into
>> shapeNoteStyles vector. It takes an argument of
>> pitch and tonic.
>>
>> Altnernatively, I could define a function which return a note head
>> shape. Does anyone see a good reason to prefer one to the other.
>>
>>
>> The first option has an advantage of using a small function like this:
>>
>> #(define (shapeSemitone pitch tonic)
>> (modulo (ly:pitch-semitones pitch) 12))
>>
>> plus an already standard vector.
>>
>> The second option has an advantage of everything being included in one
>> variable, but the disadvantage of requiring slightly more complicated
>> functions.
>>
>> For examples, see Twinline or kevin in this page:
>
> --
> Han-Wen Nienhuys - address@hidden - http://www.xs4all.nl/~hanwen