The following three items are consequences of this change.
+@item
+The repetitive chord entry aid @code{q} has been reimplemented.
+Repeated chords are now replaced right before interpreting a music
+expression. In case the user wants to retain some events of the
+original chord, he can run the repeat chord replacement function
+@code{\chordRepeats} manually.
+
+@item
+String numbers and right hand fingerings on single notes now appear
+without having to be written inside of chord brackets.
+
@item
Music functions now work the same when used inside or outside of chords,
including all the possibilities of argument parsing. Music variables
events and lyrics is now possible, but not likely to give results yet.
@item
-The repetitive chord entry aid @code{q} has been reimplemented.
-Repeated chords are now replaced right before interpreting a music
-expression. In case the user wants to retain some events of the
-original chord, he can run the repeat chord replacement function
-@code{\chordRepeats} manually.
-
-@item
-String numbers and right hand fingerings on single notes now appear
-without having to be written inside of chord brackets.
+@code{\tweak} now takes an optional layout object specification. It can
+be used for tweaking layout objects that are only indirectly caused by
+the tweaked event, like accidentals, stems, and flags:
+
+@lilypond[verbatim,quote,ragged-right,relative=2]
+<\tweak Accidental #'color #red cis4
+ \tweak Accidental #'color #green es
+ g>
+@end lilypond
@item
Scheme expressions inside of embedded Lilypond (@code{#@{@dots{}#@}})
Guide, node Updating translation committishes..
@end ignore
-@c \version "2.15.10"
+@c \version "2.15.39"
@node Tweaking output
@chapter Tweaking output
which occur at the same musical moment as the @code{\override}
command itself.
-The @code{\tweak} command operates in a different way. It acts
-on the immediately following item in the input stream. However,
-it is effective only on objects which are created directly from
-the input stream, essentially note heads and articulations;
-objects such as stems and accidentals are created later and
-cannot be tweaked in this way.
+The @code{\tweak} command operates in a different way. It acts on
+the immediately following item in the input stream. In its simplest
+form, it is effective only on objects which are created directly
+from the following item, essentially note heads and articulations.
So to return to our example, the size of the middle note of
a chord would be changed in this way:
<c \tweak #'font-size #-3 e g>4
@end lilypond
-Note that the syntax of @code{\tweak} is different from that
-of the @code{\override} command. Neither the context nor the
-layout object should be specified; in fact, it would generate
-an error to do so. These are both implied by the following
-item in the input stream. Note also that an equals sign should
-not be present. So the general syntax of the
-@code{\tweak} command is simply
+Note that the syntax of @code{\tweak} is different from that of the
+@code{\override} command. The context should not be specified; in
+fact, it would generate an error to do so. Both context and layout
+object are implied by the following item in the input stream. Note
+also that an equals sign should not be present. So the simple form
+of the @code{\tweak} command is
@example
\tweak #'@var{layout-property} #@var{value}
itself. In case of multiple direction overrides (@code{^} or @code{_}),
the leftmost override wins since it is applied last.
+@cindex @code{\tweak}, Accidental
+@cindex @code{\tweak}, specific layout object
+
+Objects such as stems and accidentals are created later, and not
+directly from the following event. It is still possible to use
+@code{\tweak} on such indirectly created objects by explicitly naming
+the layout object, provided that LilyPond can trace its origin back to
+the original event:
+
+@lilypond[quote,fragment,ragged-right,verbatim,relative=2]
+<\tweak Accidental #'color #red cis4
+ \tweak Accidental #'color #green es
+ g>
+@end lilypond
+
+This long form of the @code{\tweak} command can be described as
+@example
+\tweak @var{layout-object} #'@var{layout-property} @var{value}
+@end example
+
@cindex tuplets, nested
@cindex triplets, nested
@cindex bracket, tuplet
% Stem on the d2 must be down to permit merging
\stemDown
% Stem on the d2 should be invisible
- \once \override Stem #'transparent = ##t
- \once \override Flag #'transparent = ##t
+ \tweak Stem #'transparent ##t
+ \tweak Flag #'transparent ##t
d2
}
\new Voice {
% Stem on the d2 must be down to permit merging
\stemDown
% Stem on the d2 should be invisible
- \once \override Stem #'transparent = ##t
- \once \override Flag #'transparent = ##t
+ \tweak Stem #'transparent ##t
+ \tweak Flag #'transparent ##t
d2
}
\new Voice {
@lilypond[quote,fragment,relative=2,verbatim]
<<
{
- \once \override Stem #'transparent = ##t
- \once \override Flag #'transparent = ##t
+ \tweak Stem #'transparent ##t
+ \tweak Flag #'transparent ##t
b8~ b\noBeam
}
\\
@lilypond[quote,fragment,relative=2,verbatim]
<<
{
- \once \override Stem #'transparent = ##t
- \once \override Flag #'transparent = ##t
- \once \override Stem #'length = #8
+ \tweak Stem #'transparent ##t
+ \tweak Flag #'transparent ##t
+ \tweak Stem #'length #8
b8~ b\noBeam
}
\\
Guide, node Updating translation committishes..
@end ignore
-@c \version "2.15.20"
+@c \version "2.15.39"
@node Changing defaults
@chapter Changing defaults
syntax:
@example
-\tweak #'@code{grob-property} #@code{value}
+\tweak @var{layout-object} #'@var{grob-property} @var{value}
@end example
-The @code{\tweak} command applies to the object that immediately
-follows @code{value} in the music stream.
+Specifying @var{layout-object} is optional.
+The @code{\tweak} command applies to the music object that immediately
+follows @var{value} in the music stream.
@ignore
In some cases, it is possible to take a short-cut for tuning
For the @code{\tweak} command to work, it must
remain immediately adjacent to the object to which it is
to apply after the input file has been converted to a music stream.
-At times, LilyPond may insert additional items into the music stream
-during the parsing process. For example, when a note that is not
-explicitly part of a chord will be placed in a chord by LilyPond,
-so notes to be modified with @code{\tweak} must be placed inside
-a chord construct:
+Tweaking a whole chord does not do anything since its music event
+only acts as a container, and all layout objects are created from events
+inside of the @code{EventChord}:
@lilypond[relative=2,verbatim,quote]
\tweak #'color #red c4
-<\tweak #'color #red c>4
+\tweak #'color #red <c e>4
+<\tweak #'color #red c e>4
@end lilypond
-The @code{\tweak} command cannot be used to modify any item
-that does not appear explicitly in the input file. In particular
-it cannot be used to modify stems,
-beams or accidentals directly, since these are generated later by
-note heads, rather than by music elements in the input stream.
-Nor can @code{\tweak} be used to modify clefs or time
+The simple @code{\tweak} command cannot be used to modify any object
+that is not directly created from the input. In particular
+it will not affect stems, automatic
+beams or accidentals, since these are generated later by
+\@code{NoteHead} layout objects rather than by music elements in the
+input stream.
+
+Such indirectly created layout objects can be tweaked using the explicit
+form of the @code{\tweak} command:
+
+@lilypond[relative=2,verbatim,quote]
+\tweak Stem #'color #red
+\tweak Beam #'color #green c8 e
+<c e \tweak Accidental #'font-size #-3 ges>4
+@end lilypond
+
+@code{\tweak} cannot be used to modify clefs or time
signatures, since these become separated from any preceding
@code{\tweak} command in the input stream by the automatic
insertion of extra elements required to specify the context.
@rextend{Displaying music expressions}.
@knownissues
-@cindex tweaks in a variable
-
-The @code{\tweak} command cannot be used inside a variable.
-
-@cindex tweaks in lyrics
-The @code{\tweak} commands cannot be used in @code{\lyricmode}.
@cindex tweaking control points
@cindex control points, tweaking
In addition to numbers, we can use music expressions such
as notes for arguments to music functions:
-@c TODO: use a better example (the music argument is redundant).
-
@lilypond[quote,verbatim,ragged-right]
custosNote =
#(define-music-function
(parser location note)
(ly:music?)
#{
- \once \override Voice.NoteHead #'stencil =
- #ly:text-interface::print
- \once \override Voice.NoteHead #'text =
- \markup \musicglyph #"custodes.mensural.u0"
- \once \override Voice.Stem #'stencil = ##f
+ \tweak NoteHead #'stencil #ly:text-interface::print
+ \tweak NoteHead #'text
+ \markup \musicglyph #"custodes.mensural.u0"
+ \tweak Stem #'stencil ##f
$note
#})
tempoPadded =
#(define-music-function
(parser location padding tempotext)
- (number? string?)
+ (number? markup?)
#{
\once \override Score.MetronomeMark #'padding = #padding
\tempo \markup { \bold #tempotext }
\relative c'' {
\tempo \markup { "Low tempo" }
c4 d e f g1
- \tempoPadded #4.0 #"High tempo"
+ \tempoPadded #4.0 "High tempo"
g4 f e d c1
}
@end lilypond
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