Re: \autochange for chords

[Bernardo Barros]

On Wed, Sep 21, 2011 at 10:45 PM, address@hidden
<address@hidden> wrote:
>
> I wrote a proof-of-concept patch to do this a while back, and I'm laying some 
> groundwork in the source to make this sorta thing possible.

Great!

>
> It takes a severe gutting of several engravers in LilyPond (Stem, Note_heads, 
> Rhythmic_column) to meddle with contexts (you have to do context assignment 
> manually, like Auto_beam_engraver).  If you copy the logic in 
> Change_iterator::process to Event_chord_iterator::process, that does it.
>
> The big problem that comes up is not the implementation of making it happen, 
> but:
> (1) The collisions that arise when the stem crosses staffs (this is what I'm 
> working on now via something called Span_bar_stub_engraver and 
> Pure_from_neighbor_interface...to be released soon).
> (2) The coordination of multiple NoteCollision and NoteColumn grobs across 
> staffs (I briefly worked on this and then gave up - it requires a PhD in 
> rocket science).
>
> So, if you are interested in helping out on some of the coding, yes, it could 
> be possible!  Lemme know :)
>

The way it is right now is just much worse then a symbol collision!
Any hackish solution would be better then this.

Bu of course a good solution without any collision would be just perfect.

This would be a great time saver for regular piano writing, imagine a
piece full of those chords!

I don't have the skills to code it, but let me know if I can help somehow.