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Notation contexts (like Score and Staff) not only store properties,
they also contain plug-ins, called “engravers” that create notation
elements. For example, the Voice context contains a
Note_head_engraver and the Staff context contains a
Key_signature_engraver.
For a full a description of each plug-in, see Engravers. Every context described in Contexts lists the engravers used for that context.
It can be useful to shuffle around these plug-ins. This is done by
starting a new context, with \new or \context, and
modifying it like this,
\new context \with {
\consists ...
\consists ...
\remove ...
\remove ...
etc.
}
..music..
where the ... should be the name of an engraver. Here is a simple
example which removes Time_signature_engraver and
Clef_engraver from a Staff context,
<< \new Staff {
f2 g
}
\new Staff \with {
\remove "Time_signature_engraver"
\remove "Clef_engraver"
} {
f2 g2
}
>>
In the second stave there are no time signature or clef symbols. This is a rather crude method of making objects disappear since it will affect the entire staff. The spacing will be adversely influenced too. A more sophisticated methods of blanking objects is shown in Common tweaks.
The next example shows a practical application. Bar lines and time
signatures are normally synchronized across the score. This is done
by the Timing_engraver. This plug-in keeps an administration of
time signature, location within the measure, etc. By moving the
Timing_engraver engraver from Score to Staff context, we can
have a score where each staff has its own time signature.
\new Score \with {
\remove "Timing_engraver"
} <<
\new Staff \with {
\consists "Timing_engraver"
} {
\time 3/4
c4 c c c c c
}
\new Staff \with {
\consists "Timing_engraver"
} {
\time 2/4
c4 c c c c c
}
>>
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This page is for LilyPond-2.2.2 (stable-branch). |