Re: Tikz(or any) integration or drawing curved arrows

[Marc Hohl]

Am 16.11.2012 12:33, schrieb Urs Liska:
> Am 16.11.2012 11:28, schrieb Francisco Vila:
> > 2012/11/16 Francisco Vila <address@hidden>:
> > > 2012/11/16 Stretto <address@hidden>:
> > > > I would like to draw some curved arrows between notes, sort of like 
> > > > slurs
> > > > that have arrow tips at the end. It would be even better if I could 
> > > > actually
> > > > integrate tikz code and each musical element be treated as a 
> > > > node... this
> > > > way I could leverage the power of tikz to draw non-musical symbols and
> > > > graphics. Just drawing curved and straight arrows will do though.
> > > >
> > > > Any ideas if this is possible?
> > >  From the little I know about TikZ I can say it could be possible if
> > > the typesetting engine of lilypond were LaTeX, but it is not. Music is
> > > drawn using Postscript primitives.
> > That said, we already have point-and-click links in PDF for most
> > notation elements. They are text coordinates (line+column) taken from
> > input code. Something similar is what you propose and it is very
> > interesting; we would need something like this:
> >
> > First, marking desired elements in the input. We have balloons
> > http://lilypond.org/doc/v2.17/Documentation/notation/outside-the-staff#balloon-help 
> >
> > that could inspire some new ideas on how to implement it.
> >
> > Then, make lilypond to export a file which contains the coordinates of
> > the points you marked before.
> >
> > Maybe this file could be converted to TikZ nodes and it would be
> > possible to create a transparent layer on top of the score, that
> > contains your TikZ graph. Is it possible to make a TikZ graph using
> > absolute paper coordinates?
> I don't know enough about it, but it should be possible to place 
> images at an arbitrary place on an otherwise empty page.
>
> One could also think about the other way of importing the score pdf in 
> the latex document with pdfpages. If that would work, one could 
> finetune the TikZ graph on top of the finished score..
>
> Is it OTOH possible to somehow invoke an external command during 
> LilyPond's creating process (which could be a script to write a 
> snippet LaTeX document and produce an .eps file on-the-fly that could 
> then be included in LilyPond (making use of its collision handling)=?
Yes, see
http://lists.gnu.org/archive/html/lilypond-user/2011-09/msg00004.html

Marc
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