Re: slur corehack

[Flaming Hakama by Elaine]

Thanks for the help.

I'm glad that the right way to do this is reasonably straightforward, this example code provided by Simon:

\layout {
  \context {
    \Voice
    \override Slur.height-limit = 5.6
  }
}

But this makes me wonder why our docs don't mention this approach?

Below are some suggestions for adding to the docs to shine some light on this approach.

It might be good in the NR to mention the properties relevant to this task (properties that are actually settable, and affecting the layout of the curve), since the full list in the Internals reference might be too low level, and/or not actually settable (intended to be calculated on the fly, like direction)?

Besides height-limit, ratio and minimum-length, are there other slur properties that anyone regularly modifies in their work?

Here's what we have in the way of docs:

http://lilypond.org/doc/v2.19/Documentation/notation/modifying-shapes

Modifying ties and slurs

Ties, Slurs, PhrasingSlurs, LaissezVibrerTies and RepeatTies are all drawn as third-order Bézier curves. If the shape of the tie or slur which is calculated automatically is not optimum, the shape may be modified manually in two ways:

1. by specifying the displacements to be made to the control points of the automatically calculated Bézier curve, or
2. by explicitly specifying the positions of the four control points required to define the wanted curve.

Both methods are explained below. The first method is more suitable if only slight adjustments to the curve are required; the second may be better for creating curves which are related to just a single note.

How about something like:

Modifying ties and slurs

Ties, Slurs, PhrasingSlurs, LaissezVibrerTies and RepeatTies are all drawn as third-order Bézier curves. If the shape of the tie or slur which is calculated automatically is not optimum, the shape may be modified manually in three ways:

1. by redefining the default properties of Ties, Slurs, PhrasingSlurs, LaissezVibrerTies and RepeatTies within a layout block
   
2. by specifying the displacements to be made to the control points of the automatically calculated Bézier curve, or
3. by explicitly specifying the positions of the four control points required to define the wanted curve.

The first method is appropriate if you want to affect all instances of these curves within a layout. The second method is more suitable if only slight adjustments to a single curve are required; the third may be better for creating curves which are related to just a single note.

...

Specify alternate curve default values

Within a layout block, you can specify alternative values for properties of curved objects.  in particular, the properties height-limit and ratio are useful for specifying general curvature.

\layout {
  \context {
    \Voice
    \override Slur.height-limit = 5.6
    \override Slur.ratio = 0.42
    \override Slur.minimum-length = 2.3
  }
}

The complete list of properties for curved objects are defined in the Internals documentation: 

http://lilypond.org/doc/v2.19/Documentation/internals/slur

http://lilypond.org/doc/v2.19/Documentation/internals/tie

http://lilypond.org/doc/v2.19/Documentation/internals/phrasingslur

http://lilypond.org/doc/v2.19/Documentation/internals/laissezvibrertie

http://lilypond.org/doc/v2.19/Documentation/internals/repeattie

This page in the NR could have a link to the above modifying shapes page in the "See also" section:

http://lilypond.org/doc/v2.19/Documentation/notation/expressive-marks-as-curves

See also

...

Notation Reference: Direction and placement, Phrasing slurs, Modifying shapes

On the "direction and placement" page

http://lilypond.org/doc/v2.19/Documentation/notation/direction-and-placement

there is no information about "placement", only direction.

If "direction" and "placement" distinct and different, then there should be something specific said about placement (perhaps a link back to the Modifying shapes page?)

If not, how about just calling it "direction", since placement isn't covered?

David Elaine Alt

415 . 341 .4954                                           "Confusion is highly underrated"

address@hidden

self-immolation.info
skype: flaming_hakama
Producer ~ Composer ~ Instrumentalist
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

   6. Re:slur corehack (Urs Liska)