rfc: basic color support

[Han-Wen Nienhuys]

address@hidden writes:
> Hello all,
> 
> Just for fun, I've hacked up a patch that provides basic color support
> (only in the ps backend).
> 
> Why color:
> Sometimes when I teach music, I find colors to be helpful ("today
> we're gonna learn a new note: the f note. All the red notes in this
> piece are f's").
> 
> Short description of the patch:
> scm/define-grob-properties.scm: introduce the color property
> scm/output-ps.scm: {set,reset}color commands.
> lily/stencil.cc (interpret_stencil_expression): when a "colored
> expression" is encountered: save current color, process the
> expression, restore color.
> lily/system.cc (get_line): check all grobs for color property and
> prepare the stencil scheme expressions for further processing in
> interpret_stencil_expression().
> 
> NB: This patch is just a request for comments. Use it like this:
> \override <grob> #'color = #'(1.0 0.0 0.0)
> The scheme list is an RGB color. Values must be between 0.0 and 1.0.

* I'd almost be tempted to either make a smob, or use a vector.

* don't forget about the svg and tex  backends.

* implementation seems fine.

-- 

 Han-Wen Nienhuys   |   address@hidden   |   http://www.xs4all.nl/~hanwen