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5.3.3 The \override command
There is a special type of context property: the grob
description. Grob descriptions are named in StudlyCaps
(starting with capital letters). They contain the
‘default settings’ for a particular kind of grob as an
association list. See ‘scm/define-grobs.scm’
to see the settings for each grob description. Grob descriptions
are modified with \override.
\override is actually a shorthand;
\override context.GrobName #'property = #value
is more or less equivalent to
\set context.GrobName =
#(cons (cons 'property value)
<previous value of context.GrobName>)
The value of context.GrobName (the alist) is used to initialize
the properties of individual grobs. Grobs have
properties, named in Scheme style, with
dashed-words. The values of grob properties change
during the formatting process: formatting basically amounts
to computing properties using callback functions.
For example, we can increase the thickness of a note stem by
overriding the thickness property of the Stem
object:
c4 c \override Voice.Stem #'thickness = #3.0 c4 c
If no context is specified in an \override, the bottom
context is used:
{ \override Staff.Stem #'thickness = #3.0
<<
{
e4 e
\override Stem #'thickness = #0.5
e4 e
} \\ {
c4 c c c
}
>>
}
The effects of \override can be undone by \revert:
c4 \override Voice.Stem #'thickness = #3.0 c4 c \revert Voice.Stem #'thickness c4
The effects of \override and \revert apply to all
grobs in the affected context from the current time forward:
{
<<
{
e4
\override Staff.Stem #'thickness = #3.0
e4 e e
} \\ {
c4 c c
\revert Staff.Stem #'thickness
c4
}
>>
}
\once can be used with \override
to affect only the current time step:
{
<<
{
\override Stem #'thickness = #3.0
e4 e e e
} \\ {
c4
\once \override Stem #'thickness = #3.0
c4 c c
}
>>
}
参照
Internals Reference: Backend
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