Re: Attaching an alist to a grob

[Paul Morris]

Urs Liska wrote
> So does anyone have an idea how I can attach an alist to a grob so that 
> an engraver can retrieve it?
> Is it for example possible to add an arbitrary property to a grob?

Hi Urs,  I've had good luck creating custom grob properties, which sounds
like what you're looking for.  Here's how I do it, with some example custom
properties that I use:

%% CUSTOM GROB PROPERTIES
%% I use "cn-" to keep my functions separate from standard
%% LilyPond functions (like a poor man's namespace).

% function from "scm/define-grob-properties.scm" (modified)
#(define (cn-define-grob-property symbol type?)
   (set-object-property! symbol 'backend-type? type?)
   (set-object-property! symbol 'backend-doc "custom grob property")
   symbol)

#(cn-define-grob-property 'cn-is-clairnote-staff boolean?)

#(cn-define-grob-property 'cn-vscale-staff number?)


Once they are defined I can use the custom properties with any grob (e.g.
StaffSymbol):

\override StaffSymbol.cn-is-clairnote-staff = ##t
\override StaffSymbol.cn-vscale-staff = #1.2


I suppose for an alist you would just use list? as the type predicate (or
maybe there's one for alists?).

Cheers,
-Paul



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