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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 } >> }
See also
Internals Reference: Backend
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