Re: Getting grob Y position (spacing error)

[Jean Abou Samra]

Le 31/12/2022 à 19:43, Gregory Evans a écrit :
> It appears to be the case that there is a limitation to how far to the 
> right notes can be checked. Let’s call the starting note |A| and the 
> stopping note |B|. It seems like the boundary is if the start-offset 
> of |B| is further forward than the stop-offset of |A|. In the above 
> image, a line cannot be drawn between the 2nd note of the top staff 
> and the 8th note of the middle staff. Can you explain why this is? Is 
> this a situation where the note columns are not finished being spaced, 
> similar to my initial confusion about the timing of skyline 
> calculation? Anyway, the ability to draw lines between any arbitrary 
> location is not precisely necessary for what I’m trying to accomplish, 
> I would just like to understand what I don’t know!


The engraver iterates over busyGrobs (maintained by Grob_pq_engraver),
which is precisely, by definition, the set of grobs with a cause in events
that tells they are still "active" at the current moment.

If you want different behavior, acknowledge note-head-interface yourself
and store the grobs in a variable in the engraver (adding a new binding
in (let ((followed ...) [here]) ...)).


> p.s. In the Johnston example, notes are able to be used as line 
> anchors more than once. Would there be a way to include something like 
> a spanner ID?


What about using a details.spanner-ids symbol list property?
You'd read it on the note column to know which spanners to start/stop.

Best,
Jean

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