On Tue, Feb 28, 2012 at 2:56 PM, Pavel Roskin <pro...@gnu.org> wrote:
> Hello, Joe! > > > In case it wasn't clear from what I said before, engravers in lilypond > > don't do the actual layout. Instead, they build the grobs and set up > > the connections between them. Most of the layout is done in callback > > functions. > > Yes, I realize it now. Your suggestion to create a new stem worked > fine. I can get the relative coordinates of themes on different staves. > > The attached file shows where I am now. There are many minor issues, > and I hope I can solve most of them, but I'll certainly appreciate help. > > I'm getting a message "Weird stem", and I don't see how to avoid it. > Perhaps I should create a totally new grob with a unique name, such as > StemSpan. Is that possible? What would be needed? > It would be nice to do this eventually, because having a different grob name would make it easier for the users to tweak it. I think it would involve editing scm/define-grobs.scm, but there may be a way to do it from an .ly file also > How do I make the new stem start at the same point as the original > one. I tried this: > > (set! (ly:grob-property stem 'axes) (list X)) > > I don't understand how it works. Not setting axes leads to: > > programming error: axes should be nonempty > 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). Cheers, Joe
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