Re: Cross-staff stem engraver (was: New frog in an empty pond?)

[Janek Warchoł]

On Sat, Mar 3, 2012 at 5:26 AM, Pavel Roskin <address@hidden> wrote:
> Hello!
>
> On Tue, 28 Feb 2012 15:14:29 -0800
> Joe Neeman <address@hidden> wrote:
>
>> Don't use ly:axis-group-interface::add-element, because stems don't
>> implement the axis-group-interface. (Removing this will also remove
>> the axes warning.) Instead, use ly:grob-set-parent!. You'll probably
>> want to set both the X parent and the Y parent. Then the X and Y
>> offsets of new-stem will be measured relative to stem (instead of
>> relative to the whole system, which is the default).
>
> OK, this is what I have now.  I think it's a pretty good solution.
>
> The code is capable of creating multiple cross-staff stems per moment.
> It's possible to connect more than two stems as long as they lie on the
> same line.  There is a workaround for a problem with Lilypond 2.14 that
> has a flag as part of the stem.
>
> I spent way too much time on the issue, but it helped me learn
> Scheme and Lilypond.
>
> I'll be on vacation next two weeks, so I'm not sure I'll be able to
> work on Lilypond.  So I want to post my results.
>
> I tried posting this on LSR, but it won't accept it.  I get a popup
> message saying "empty output from Lilypond" or something like that.  I
> guess it's because LSR still runs Lilypond 2.12.x.  Unfortunately, I
> have no time for backports.
>
> I'm attaching the Scheme code with a convoluted example (3 staves with
> 3 voices on each).

I don't have the time to dive into details, but the output looks good!
Be sure to post it on Rietveld for a review when you come back.

cheers,
Janek