Hi Jaap, it doesn't fit with what I'm searching for (sorry: my question was not enough clear) . I need to obtain the property set/calculated by Lilypond, not the one set by me. Shortly: for a Beam, how can I:
(set! myVar positions-of-the-beam-set-by-lilypond) or: (set! myVar Y-offset-of-the-beam-set-by-lilypond) ? I don't understand if these properties are user-only settable, or if they are set by Lilypond too. If they are not set by Lilypond, how can I obtain them and put them into myVar ? My aim is to pass these properties to the SVG script through the " output-attributes" mechanism, instead of having to parse the SVG output with JS (which is possible too, but I would like to avoid that) Thanks, P On Wed, Dec 18, 2019 at 6:57 PM <[email protected]> wrote: > Without giving you any solution, I can give you a hint: > > > > Write the music in the traditional way, with and without your modification. > > > > In your lilypond file put: > > \displayMusic oldmusic > > \displayMusic newmusic > > > > And what you can see wht you have to write by observing the differences > > > > Jaap > > > > *From:* lilypond-user <[email protected]> > *On Behalf Of *Paolo Prete > *Sent:* Wednesday, December 18, 2019 3:30 PM > *To:* Aaron Hill <[email protected]> > *Cc:* lilypond-user <[email protected]> > *Subject:* Re: Need help with Scheme code > > > > Thanks again. > > Now, from what I see, I can extract if #mus is a Beam > with (ly:music-property mus 'name) --> BeamEvent > > After that, how can I set, inside the same function you wrote, a variable > with the beam-thickness value of the corresponding Beam? > > something like (pseudo code): (set! myVar current-value-of-beam-thickness > ) > > > > > > > > On Wed, Dec 18, 2019 at 5:14 AM Aaron Hill <[email protected]> > wrote: > > On 2019-12-17 6:01 pm, Paolo Prete wrote: > > And thanks again to the Scheme-master Aaron. > > I appreciate the kind words, though I doubt my experience rises to the > level of "master". > > > One last thing: > > > > how can I arrange that function so to obtain output-attributes = > > output-attributes + id ? > > > > For example: if output-attributes is (('a' . 'aa') ('i' . 'ii')) it > > must > > become: (('a' . 'aa') ('i' . 'ii') ('id' . 'foobar_1')) > > Where or how are the other output-attributes being set? It is my > understanding that output-attributes is unset by default, so any > \override or \tweak would not need to worry about existing definitions. > > That said, consider this pattern: > > %%%% > \version "2.19.83" > { \tweak Accidental.output-attributes.id 123 bes'4 } > %%%% > > Keep in mind this only *adds* a new key-value pair to the alist; it does > not change an existing entry with the same key. > > > -- Aaron Hill > >
