Re: Rotating/grouping grobs for microtonal accidentals

[Mats Bengtsson]

As far as I understand, the answer to both of your questions is that you
have to replace the function that normally is done to typeset the 
accidentals
with your own function. This is not necessarily so difficult as it first 
may seem.
The simplest solution is to use the standard function used to typeset 
any "text"
and specify the glyph to be printed as a markup, for example:

\version "2.10.0"
\relative c'{
\once \override Accidental #'stencil = #ly:text-interface::print
\once \override Accidental #'text = \markup{\rotate #180 \musicglyph 
#"scripts.lvarcomma"}
cis d e f g f e d c1 }

This solution will not automatically recognize what glyph to use 
depending on
the pitch of the note. Rather you will have to manually specify what 
markup to
use for each accidental. Of course, you can still use the standard 
mechanism
for the accidentals where the Feta font has a suitable glyph and only 
use the
workaround for the rest. Don't forget to define macros for the different 
settings
to save some typing.
A more advanced solution would be to write a few lines of Scheme code that
automatically gives you the proper accidental based on the note pitch.

   /Mats

Torsten Anders wrote:
> On Mar 28, 2008, at 8:58 PM, Torsten Anders wrote:
> > I would like to define a microtonal notation with alteration 
> > fractions (cf. 
> > http://lilypond.org/doc/v2.11/Documentation/topdocs/NEWS.html) -- 
> > thanks for providing this feature! Everything works great.
> >
> > My only problem is the creation of suitable accidentals. I need four 
> > additional signs: a comma up (/), a comma down (\), and a combination 
> > of these signs with the standard accidentals (#\ and b/). I figure I 
> > could use something like "scripts.lvarcomma" for a comma up. For a 
> > comma down, however, I need to rotate this sign or 
> > "scripts.rvarcomma". Moreover, I would like to group my commas with 
> > the common accidentals. How can I rotate and group feta font symbols 
> > which I want to add to the list of accidentals.
> >
> > % code does not work, should only clarify problem
> > myGlyphs = #'((1 . "accidentals.doublesharp")
> >     [...]
> >        (1/6 . "scripts.rvarcomma")
> >        (0 . "accidentals.natural")
> >     ;; how can I rotate a symbol?
> >        (1/6 . (rotate "scripts.lvarcomma"))
> >     [...]
> >        )
>
> Alternatively, is it perhaps possible to use another font (e.g., 
> TrueType, or some PostScript font) for the accidentals?
>
> Thank you!
>
> Best
> Torsten
>
> --
> Torsten Anders
> Interdisciplinary Centre for Computer Music Research
> University of Plymouth
> Office: +44-1752-233667
> Private: +44-1752-558917
> http://strasheela.sourceforge.net
> http://www.torsten-anders.de
>
>
>
>
>
>
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--
=============================================
        Mats Bengtsson
        Signal Processing
        School of Electrical Engineering
        Royal Institute of Technology (KTH)
        SE-100 44  STOCKHOLM
        Sweden
        Phone: (+46) 8 790 8463                         
       Fax:   (+46) 8 790 7260
        Email: address@hidden
        WWW: http://www.s3.kth.se/~mabe
=============================================