Re: Fwd: Dividing ties and adjusting ties in an arpeggiated chord

[bruys .]

Holy Moley, madMuze,
You're right, I'm feeling rather queasy right now. It's going to take
some patience to get to the bottom of this.
Your suggestion of separating the notes into separate voices and then
combining them might be the way to go (it seems to be the only way to
go, if I going to use the "difficult tweaks" control-points property
method). One possibility would be to do this, and then use slurs
instead of ties, because I notice that Lilypondtool has a "slur tweak
tool" which you could presumably use to change the slurs to look like
ties in the shape wanted.
Using the snippet that Eluze pointed me to (\hideCurvesFrom) seems to
nicely avoid the accidental if I use the grob Staff.Accidental,
however Staff.NoteHead or Staff.NoteColumn doesn't seem to have any
effect. When I use Voice.NoteHead, it avoids the notehead, but it
stuffs the accidentals up (they now overlap the noteheads).
I notice that there is also a snippet called "Altering the shape of a
default slur with a list of offsets" which could probably be adapted
to ties and used where there are separate voices. It would be useful
to have a variant of this function which allowed you to specify the
height, in staff spaces, of the curve of the tie. It would certainly
require some study on Bezier curves. That's do-able, but I don't know
whether I'll ever get to the level of competence with the Scheme
interface to work this one out, but I'm not giving up yet.
Your white box idea is yet another avenue for exploration.
Thanks for your help!
Regards,
bruys


On Sun, Apr 3, 2011 at 4:49 PM, madMuze <address@hidden> wrote:
>
>>It will be interesting to see if it works
>>in this example where there is more than one tie at a time.
>>That potentially answers half my question. I wonder if anyone knows
>>how to alter the curve of the ties in this situation.
>
> Oh dear, but you are asking for it !
> If one is adept with scheme, some or even much of the following can be
> automated. Even so, it's quite a trip down the rabbit hole and only you can
> decide if it is worth the grief.
>
> You can, of course, write your own code to shape and position ties and place
> it in your style file. The example code in the notation reference under
> "difficult tweaks" is the model to follow. This could include any number of
> conditions and calculations. However, although the left endpoint and the
> inner control points can be determined from the first note of the tie
> (X-offset = 0, Y-offset = position on the staff), I know of no way to access
> the second note's position directly. Fortunately, the X-offset of the right
> endpoint as determined by LilyPond (which varies in relation to the note)
> can be retrieved:
>
>        \override Score.Tie #'after-line-breaking = #(lambda (grob)
>                (let*   (
>                        (noteL (ly:grob-parent (ly:grob-original grob) X)) % 
> left notehead
>                        (endX (car (cadddr (ly:tie::calc-control-points 
> grob)))) % right endpoint
> of tie
>                        (dotX (ly:duration-dot-count (ly:event-property 
> (event-cause noteL)
> 'duration)))
>                                % number of dots on left notehead
>                        (noteY (ly:grob-property noteL 'Y-offset)) % vertical 
> position of
> notehead
>                        (taiDir (ly:tie::calc-direction grob)) % tie direction 
> according to
> LilyPond
>                        % … … … many, many things would follow to account for 
> most,
>                        % if not all, possibilities
>
> I know almost nothing of scheme and have gleaned these bits from the very
> nice and intelligent people on this forum. You'll need a good bit of scheme,
> a deep understanding of the Bezier function (in order to quantize the hump
> and avoid staff-line collisions), and a couple hours/days/months to
> experiment, if you plan to go this route. A similar routine could be created
> incorporating variables along with "\once \override…" for adjusting
> occasional, rather than default, behavior.
>
> % freak not, remember to breathe %
>
> You can also separate the chord into different voices and use:
>
>        \override Staff.NoteColumn #'ignore-collision = ##t % and afterwards, 
> ##f
>
> to allow the notes to line up vertically. (You would have to manually offset
> seconds.) Then, each voice can have its own command, allowing you to realize
> your dream of controlling the ties independently:
>
>        \once \override Voice.Tie #'control-points = …
>
> You can, of course, create definitions and shortcuts to simplify the
> process. You may need more than four voices:
>        voiceFive = #(context-spec-music (make-voice-props-set 4) 'Voice)
> …
>        voiceNine = #(context-spec-music (make-voice-props-set 8) 'Voice)
>
> You will certainly need some patience, and you will probably only resort to
> these measures under compulsion. Print publishers usually do in fact compel
> copyists to make these emendations; I applaud your standards and desire for
> clarity.
>
> Oh, and one other trick, not as flexible as the snippet Eluze mentioned, but
> my battered mind finds this easier (does version 2.14 have the snippet built
> in?):
> If, in your style file, you set all ties to a low layer; for instance:
>
>        \override Score.Tie #'layer = #-2
>
> you can then put something like this in your definitions file:
>
> blnkIt = #(define-music-function (parser location left bottom width height)
> (number? number? number? number?)
>        #{
>                \new Voice { \voiceNine
>                        \once \override Voice.TextScript #'layer = #-1
>                        \once \override Voice.TextScript 
> #'outside-staff-priority = ##f
>                        \once \override Voice.TextScript #'X-extent = #'(0 . 0)
>                        \once \override Voice.TextScript #'Y-extent = #'(0 . 0)
>                        \once \override Voice.TextScript #'X-offset = #0
>                        \once \override Voice.TextScript #'Y-offset = #0
>                        s1*0-\markup { \with-color #white \filled-box
>                        #(cons $left (+ $left $width)) #(cons $bottom (+ 
> $bottom $height)) #0 }
>                }
>        #}
> )
>
> Size and position the box to blank out any portion of the tie (or anything
> you might assign to the lower layer). $left = 0 is the point in the music
> where you place the command; $bottom = 0 is the center line of the staff. I
> use voiceNine so it can be positioned independently of any other text at
> that point in the music. If you can't see where the box is, change #white to
> #red until you get it in place. To blank out around a downward stem, you
> might try:
>
> \blnkIt #-0.25 #-2 #0.6 #4 e'4
>
> and adjust the #-2 and #4 for the vertical position and height.
>
> Feel better now? Red pill or blue pill? (Did anyone ever try both?)
> David
>
> --
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> http://old.nabble.com/Dividing-ties-and-adjusting-ties-in-an-arpeggiated-chord-tp31299849p31306033.html
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>
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