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Re: box around notes
Re: box around notes
Fri, 16 Dec 2011 09:06:11 +0100
On Dec 16, 2011, at 6:27 AM, David Nalesnik wrote:
> Hi all,
> I'm trying to write a function to add a box around notes. I've come up with
> the following, and I'm wondering if anyone has any ideas how to improve it or
> perhaps a different approach.
> Basically, the function creates a box as a TextSpanner. The height of the
> box is based on the highest and lowest stems.
> I'd like to automate all aspects of the function, but I've had to add a
> correction factor for height. This compensates for my inability to determine
> the Y-position of the spanner. I can determine Y-values "after the fact," but
> all my attempts to determine them _within_ the function end up "killing"
> parts of the box. You can see this by uncommenting any of the display lines
> in the function--you'll get values in the log . . . at the price of losing
> the left and right "text" of the spanner--three sides of the box. (To add to
> the mystery for me, uncommenting single lines vs. more than one yields
> different results.)
> The example uses a small correction, but even bigger numbers are needed when
> articulations are added.
> Any suggestions?
It depends on what you want your box to go around. If it's only ever notes and
stems (i.e. not articulations, tremoli, etc.), you can add a stencil property
to the NoteColumn grob that uses its extents for the parameters you need to
draw your box.
Once articulations are in the game, I'd recommend creating a custom Scheme
engraver that collects all the grobs you want, throws them into the "elements"
grob array of a custom grob that implements the axis-group-interface (you can
define your own grobs via the same procedure as grobs are defined in
define-grobs.scm), and then use axis-group-interface::pure-height and
axis-group-interface::height for the Y-extents (which will automatically search
the "elements" grob array.
- box around notes, David Nalesnik, 2011/12/16
- Re: box around notes,