New, more powerful version of \shape!

[Janek Warchoł]

Hi all,

\shape is an awesome function, indispensable for creating
publication-quality slurs. However, after using it 1107 times in a
recent project (this number is not a joke!), i came to the conclusion
that it's not perfect yet and it could use some improvements ;-)

After several days of work i'm proud to present:
- ability to use input shorthands when specifying offsets with \shape,
- a version of \shape using polar coordinates.

You can see the code in the attachment, and the output here:
http://lilypond-stuff.1065243.n5.nabble.com/file/n5705619/shapeII-example.pdf
http://lilypond-stuff.1065243.n5.nabble.com/file/n5705619/shape-polar-example.pdf

I'd like to hear your opinions.  Do you like it?  Should it be added
to official LilyPond distribution?

I've tested these changes myself and after a few dozen corrected slurs
i can say that they work well, although there is still room for
improvement - in particular, i could add more "modes" of specifying
control-points position (in addition to plain offsets and polar
coordinates), and merge everything into one function that would allow
to easily choose a different "mode" for each control-point.  And, of
course, write some great documentation :-)

I'd love to continue working on this, but i've run out of spare time
:-(  Would anyone want to sponsor further development?  Depending on
the amount of desired features, it would take 1-3 days of work, and
would cost $40-$120 (I'd also like to share the money with David
Nalesnik, who created the function in the first place and helped me
with these improvements).

best,
Janek

polar-shape.ly
Description: Binary data

shape-with-shorthands.ly
Description: Binary data