Re: Bowing instruction mid-note

[Simon Albrecht]

On 25.09.2016 13:34, B~M wrote:
> Dear All, I would like to add an up bow symbol to the
> middle of a tie between two notes. The file seg.pdf is a snippet
> of the problem. In the second tie I would like to place a V to denote
> up bow. However, the up bow and down bow symbols are attached
> to notes in the lilypond file.

Technically speaking, this is only a problem of the input syntax: the 
bowing symbols are input as post-events, which are attached to a note or 
chord, but that chord can be an empty chord – a handy construct in many 
situations.

> Is there some way I can arbitrarily place a V over the tie with x y 
> co-ordinates?

Even better, you can place it at the exact (or approximate) time when 
the bow change should happen, using a music function. Here’s an example 
with dynamic indications:

%%%%%%%%%%%%%%
\version "2.18.2"

% Thanks to David Kastrup for the inspiration!
after =
#(define-music-function (parser location t e m) (ly:duration? ly:music? 
ly:music?)
   #{
     \context Bottom <<
       #m
       { \skip $t <> -\tweak extra-spacing-width #empty-interval $e }
     >>
   #})

{ \after 4 \< \after 2 \> \after 2. \! c'1 }
%%%%%%%%%%%%%%

\after 4 \<
means
‘start a crescendo after a quarter note duration’.

The same can be done with the bowing instructions – I attach a modified 
file, where the change happens in the middle of a note.

Note that I didn’t make or test it for version 2.14 – that’s quite 
ancient and you should really update (at least) to 2.18.2, the current 
stable version.

Also a small note on your abbreviations: As long as you don’t want to 
include any tweaks or other refinements like
DB = -\tweak font-size 3 \downbow
I’d advise you to keep with the LilyPond default syntax here. Honestly, 
\downbow isn’t that many characters, and for sharing code or code 
highlighting in an editor it’s advantageous to stay with the standard.

HTH, Simon

Seg.ly
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