Re: \shape curves relative to NoteHead etc.

[Urs Liska]

Am 21. Juni 2015 09:24:48 MESZ, schrieb musicus <address@hidden>:
>Dear all,
>
>In my last project I learned that sometimes you have to tweak a lot of 
>Slurs, Ties, etc. to get a satisfying result.
>Of course, in many cases the \shape #'() Slur function helps a lot.
>My problem with this function is the dependency on Lilyponds automatic 
>output.
>If I want to change the paper-size or the staffsize, for example, the 
>calculation of the curves in the automatic output changes
>and many of my tweaks are useless.
>You can always use tags to differentiate between various paper
>settings, 
>but nevertheless you have to find the correct values again and again.
>Additionally you have to engrave first to get an impression of the 
>standard output, so that you can guess your \shape values.
>
>Because of this points I wondered if you could just use a function 
>relative to the "musical" anchor points of a curve (in most cases the 
>NoteHead, i would guess).
>\override control-points is relative to the center Staff-Line, but in 
>many cases the center line is too far away from the curve position, 
>which makes guessing a bit difficult.
>
>So, basically you need two things to get a good looking curve without 
>needing graphical feedback:
>
>
>- offset relative to its anchor for start and end points
>
>- offset relative to the straight line between start and end point for 
>the two middle points
>(that means you could ignore the rotation of a curve, which is already 
>given by start and end point)
>-> you have to convert these "rotated" offsets to standard x/y 
>coordinates relative to start and end point (I'm currently working on a
>
>formula - should be no problem)
>
>
>I think that this way tweaks to curves could be much more stable and
>the 
>needed input values could be more easily guessed, so you wouldn't need 
>that much trial & error...
>
>Is there a way to set the anchor points for curves?
>
>I thought of something like: (reference point; offset)
>Maybe it could be useful for the middle points to switch between
>"offset 
>relative to straight line" and standard x/y coordinates relative to 
>start/end point
>
>
>\override Slur.control-points = #'(NoteHead 0 . 0)(StartPoint rotated 0
>
>. 0)(EndPoint standard 0 . 0)(Stem 0 . 0))
>
>
>Probably I need some help with the scheme code for this function....
>
>What do you think of this idea?
>

Take a look at shapeII at
https://github.com/openlilylib/openlilylib/tree/master/notation-snippets/shaping-bezier-curves
Provides a number of additional ways to tweak curves.

Does this help?

Urs

>Yours,
>musicus
>
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