| Re: [frogs] Changing subproperties with grob-set-property (working on bug #40) |
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- To: frogs@xxxxxxxxxxx
- Subject: Re: [frogs] Changing subproperties with grob-set-property (working on bug #40)
- From: Neil Puttock <n.puttock@xxxxxxxxx>
- Date: Sat, 31 Oct 2009 16:28:00 +0000
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2009/10/31 Marc Hohl <marc@xxxxxxxxxx>:
> The syntax
>
> (ly:grob-set-property! grob '(bound-details right X) right-X)
>
> won't work, however. How can I put the new value into the list?
You'll have to do some C++ hacking. There are two options here (see
the code in grob-scheme.cc):
1) amend ly_grob_set_property_x () to allow lists
2) create a new exported function ly_grob_set_nested_property_x ()
I favour the latter, since it's cleaner to implement: if you amend
ly:grob-set-property! you'll have to use a hybrid type check, since
the property path could be either a symbol or list.
> Or is my approach aiming in the wrong direction?
I think it's fine for a tweak, but a better fix would involve working
directly on the code in line-spanner.cc.
(set! right-X (- right-X 30)))
You could get a compensatory value automatically by using
ly:grob-extent on the accidental.
Whatever you decide to do, allowing nested properties in
ly:grob-set-property! would be a useful enhancement.
Regards,
Neil
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