On Sat, May 2, 2015 at 10:20 AM, David Nalesnik <david.nales...@gmail.com>
wrote:
>
>
> On Sat, May 2, 2015 at 9:38 AM, Kieren MacMillan <
> kieren_macmil...@sympatico.ca> wrote:
>
>> Hi David,
>>
>> > Could you clarify how you are defining \theScore here?
>>
>> Sorry… that was pseudocode. My actual [minimized] score code was:
>>
>> \score {
>> \colorOverride <<
>> \new Staff \someMusic
>> ….
>> >>
>> }
>>
>
> OK! Though I am disappointed you don't have a magical way to put scores
> in variables :)
>
>
>>
>> I’m not sure about others (Jan-Peter?), but for the edition-engraver, I
>> would like to do something more like:
>>
>> \score {
>> <<
>> \new Staff \someMusic
>> >>
>> \layout {
>> \context {
>> \Score
>> \consists \editionEngraver editionName
>> \colorOverride
>> }
>> }
>> }
>>
>>
> The above code would work with the first approach, where \
> markAllAlteredGrobs basically created a long series of \overrides of
> every grob which might have a stencil. This involved setting the
> 'after-line-breaking property of all such grobs to a callback which
> examined the property lists of living, breathing grob instances to see if
> anything had been added to the default property list stored in the global
> variable all-grob-descriptions. The idea being that the list would change
> with any override.
>
> This approach quickly got hairy.
>
> For one thing, clefs get their 'glyph property added later on. That was
> why initially all clefs got colored, even the default treble clef that you
> get with { c d e f }, for example. Who knows if there are other such cases.
>
> For another, tweaks--unlike overrides--do not result in a change to the
> grob's basic property alist. To get at tweaks, it is necessary to find the
> "music-cause" of the grob--i.e., find the music expression which lead
> ultimately to its creation. Luckily the stream event carries a reference
> to this earlier stage of processing. (BTW, there is a note somewhere in
> the source that says this reference ought to be removed at some stage.)
>
> (This method also--like the music function \colorOverride--can't get at
> properties overridden in a \layout \context block. I really don't know how
> to do that, and I hope that someone can give me a way!)
>
> It occurred to me that it was more natural to simply look at the music
> input. The method above tries to detect overrides by a sneaky method of
> comparing property alists with default alists, bound to break down or lead
> to complexities (as with the special casing of Clef.glyph). Why not just
> look at the music expression for OverrideProperty, RevertProperty--there's
> no mistaking those for override or revert.
>
> Plus, it's easy to tell if it's a user override or one that happened
> through \voiceOne, \voiceTwo so half the stems in the piece don't turn
> green.
>
> This would be the method you hint at below:
>
>
> or
>>
>> \addEdition editionName 1 0/4 editionName.Score.A \colorOverride
>> \score {
>> <<
>> \new Staff \someMusic
>> >>
>> \layout {
>> \context {
>> \Score
>> \consists \editionEngraver editionName
>> }
>> }
>> }
>>
>
> And this *should* work just fine. Except that I believe that the
> editionEngraver adds the overrides outside of the music expression somehow.
> Therefore, they are invisible to \colorOverrides.
>
> (I wonder if Jan-Peter could clarify what it is that the engraver does;
> I'm not familiar with the code, and fear that I've misrepresented it.)
>
> I *would* like to figure out how to get into the \layout block to color
> those overrides too. However, I'm guessing that this will have to be done
> by a second function, a two-pass approach to coloring the score. And,
> again, I need advice on how to write such a function :)
>
>
OK, why don't I just try the obvious?
To wit:
%%%
\colorOverride
{
\tweak font-size 3
c'1
\tweak NoteHead.font-size 3
\tweak Stem.thickness 2
c'2
<c' \tweak font-size 3 e'>
<\tweak NoteHead.font-size 3 c' e'>1
\override NoteHead.font-size = 4
c'1
\temporary \override NoteHead.font-size = 12
c'1
\revert NoteHead.font-size
\revert Score.BarLine.X-extent
\revert Staff.Clef.stencil
\clef alto
c'1
}
\layout {
\context {
\Score {
\colorOverride
{
\override BarLine.X-extent = #'(-2 . 2)
}
}
}
\context {
\Staff
\colorOverride
{
\override Clef.stencil =
#(lambda (grob)
(ly:stencil-rotate (ly:clef::print grob) -15 0 0))
}
}
}
%%%
Notice that the \revert-s in the music expression actually work on the
stuff from the context block.
DN
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