their appearance and behaviour. Some of these properties are common
to all spanners; others are restricted to a sub-set of the spanners.
-All spanners support the @code{spanner-interface}. A few, esentially
+All spanners support the @code{spanner-interface}. A few, essentially
those that draw a straight line between the two objects, support in
addition the @code{line-spanner-interface}.
@end lilypond
This property is not effective for all spanners. For example,
-seting it to @code{#t} has no effect on slurs or phrasing slurs
+setting it to @code{#t} has no effect on slurs or phrasing slurs
or on other spanners for which terminating on the bar line would
not be meaningful.
@node Aligning objects
@subsection Aligning objects
-Graphical objects which support the @code{self-alignment-interface} and/or
-the @code{side-position-interface} can be
-aligned to a previously placed object in a variety of ways. For a list of these objects, see
+Graphical objects which support the @code{self-alignment-interface}
+and/or the @code{side-position-interface} can be aligned to a previously
+placed object in a variety of ways. For a list of these objects, see
@rinternals{self-alignment-interface} and @rinternals{side-position-interface}.
All graphical objects have a reference point, a horizontal extent and a
vertical extent. The horizontal extent is a pair of numbers
giving the displacements from the reference point of the left and
-right edges, displacements to the left being negative. The
-vertical extent is a pair of numbers giving the displacement from
-the reference point to the bottom and top edges, displacements down
-being negative.
+right edges, displacements to the left being negative. The vertical
+extent is a pair of numbers giving the displacement from the reference
+point to the bottom and top edges, displacements down being negative.
An object's position on a staff is given by the values of the
@code{X-offset} and @code{Y-offset} properties. The value of
-@code{X-offset} gives the displacement from the x coordinate of
+@code{X-offset} gives the displacement from the X coordinate of
the reference point of the parent object, and the value of
@code{Y-offset} gives the displacement from the center line of the
-staff. The values of @code{X-offset} and
-@code{Y-offset} may be set directly or may be set to be calculated
-by procedures in order to achieve alignment with the parent object
-in several ways.
+staff. The values of @code{X-offset} and @code{Y-offset} may
+be set directly or may be set to be calculated by procedures in order
+to achieve alignment with the parent object.
@warning{Many objects have special positioning considerations which
cause any setting of @code{X-offset} or @code{Y-offset} to be
ignored or modified, even though the object supports the
-@code{self-alignment-interface}.}
+@code{self-alignment-interface}. Overriding the @code{X-offset}
+or @code{Y-offset} properties to a fixed value causes the respective
+@code{self-alignment} property to be disregarded.}
-For example, an accidental can be repositioned
-vertically by setting @code{Y-offset} but any changes to
-@code{X-offset} have no effect.
+For example, an accidental can be repositioned vertically by setting
+@code{Y-offset} but any changes to @code{X-offset} have no effect.
-Rehearsal marks may be aligned with
-breakable objects such as bar lines, clef symbols, time signature
-symbols and key signatures. There are special properties to be
-found in the @code{break-aligned-interface} for positioning rehearsal
-marks on such objects.
+Rehearsal marks may be aligned with breakable objects such as bar
+lines, clef symbols, time signature symbols and key signatures. There
+are special properties to be found in the @code{break-aligned-interface}
+for positioning rehearsal marks on such objects.
+
+@seealso
+@ref{Using the break-alignable-interface},
+@rextend{Callback functions}.
@menu
* Setting X-offset and Y-offset directly::
centered above the object:
@lilypond[verbatim,quote,relative=1]
-e1
-% the RehearsalMark will be centered above the Clef
+% The rehearsal mark will be centered above the Clef
\override Score.RehearsalMark #'break-align-symbols = #'(clef)
\key a \major
\clef treble
\mark "↓"
-e
-% the RehearsalMark will be centered above the TimeSignature
+e1
+% The rehearsal mark will be centered above the Time Signature
\override Score.RehearsalMark #'break-align-symbols = #'(time-signature)
\key a \major
\clef treble
\time 3/4
\mark "↓"
e2.
+% The rehearsal mark will be centered above the Breath Mark
+\override Score.RehearsalMark #'break-align-symbols = #'(breathing-sign)
+\key a \major
+\clef treble
+\time 4/4
+e1
+\breathe
+\mark "↓"
@end lilypond
A list of possible target alignment objects may be specified. If
line would be.
@lilypond[verbatim,quote,relative=1]
-e1
-% the RehearsalMark will be centered above the Key Signature
+% The rehearsal mark will be centered above the Key Signature
\override Score.RehearsalMark #'break-align-symbols = #'(key-signature clef)
\key a \major
\clef treble
\mark "↓"
-e
-% the RehearsalMark will be centered above the Clef
+e1
+% The rehearsal mark will be centered above the Clef
\set Staff.explicitKeySignatureVisibility = #all-invisible
\override Score.RehearsalMark #'break-align-symbols = #'(key-signature clef)
-\key a \minor
+\key a \major
\clef bass
\mark "↓"
-e,
+gis,,1
+% The rehearsal mark will be centered above the Bar Line
+\set Staff.explicitKeySignatureVisibility = #all-invisible
+\set Staff.explicitClefVisibility = #all-invisible
+\override Score.RehearsalMark #'break-align-symbols = #'(key-signature clef)
+\key a \major
+\clef treble
+\mark "↓"
+e''1
@end lilypond
The alignment of the rehearsal mark relative to the notation object
multiple staves, this setting should be done for all the staves.
@lilypond[verbatim,quote,relative=1]
-% The RehearsalMark will be centered above the KeySignature
+% The RehearsalMark will be centered above the Key Signature
\override Score.RehearsalMark #'break-align-symbols = #'(key-signature)
\key a \major
\clef treble
\time 4/4
\mark "↓"
e1
-% The RehearsalMark will be aligned with the left edge of the KeySignature
+% The RehearsalMark will be aligned with the left edge of the Key Signature
\once \override Score.KeySignature #'break-align-anchor-alignment = #LEFT
\mark "↓"
\key a \major
-e
-% The RehearsalMark will be aligned with the right edge of the KeySignature
+e1
+% The RehearsalMark will be aligned with the right edge of the Key Signature
\once \override Score.KeySignature #'break-align-anchor-alignment = #RIGHT
\key a \major
\mark "↓"
-e
+e1
@end lilypond
-The rehearsal mark can also be offset to the right or left of the left edge
-by an arbitrary amount. The units are staff-spaces:
+The rehearsal mark can also be offset to the right or left of the left
+edge by an arbitrary amount. The units are staff-spaces:
@lilypond[verbatim,quote,relative=1]
-% The RehearsalMark will be aligned with the left edge of the KeySignature
+% The RehearsalMark will be aligned with the left edge of the Key Signature
% and then shifted right by 3.5 staff-spaces
\override Score.RehearsalMark #'break-align-symbols = #'(key-signature)
\once \override Score.KeySignature #'break-align-anchor = #3.5
\key a \major
\mark "↓"
-e
-% The RehearsalMark will be aligned with the left edge of the KeySignature
+e1
+% The RehearsalMark will be aligned with the left edge of the Key Signature
% and then shifted left by 2 staff-spaces
\once \override Score.KeySignature #'break-align-anchor = #-2
\key a \major
\mark "↓"
-e
+e1
@end lilypond
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