particular effect.
-@cindex Program reference
+@cindex Internals Reference
The controls available for tuning are described in a separate
document, the
@iftex
-Program reference manual.
+Internals Reference manual.
@end iftex
@ifnottex
-@ref{Top,Program reference,,lilypond-internals}.
+@ref{Top,Internals Reference,,lilypond-internals}.
@end ifnottex
That manual
lists all different variables, functions and options available in
There are four areas where the default settings may be changed:
-@itemize @bullet
+@itemize
@item
Automatic notation: changing the automatic creation of notation
elements. For example, changing the beaming rules.
@item
Page layout: changing the appearance of the spacing, line
breaks, and page dimensions. These modifications are discussed
-in @ref{Non-musical notation} and @ref{Spacing issues}.
+in @ref{Non-musical notation}, and @ref{Spacing issues}.
@end itemize
Internally, LilyPond uses Scheme (a LISP dialect) to provide
infrastructure. Overriding layout decisions in effect accesses the
program internals, which requires Scheme input. Scheme elements are
introduced in a @code{.ly} file with the hash mark
-@code{#}.@footnote{@ref{Scheme tutorial} contains a short tutorial
+@code{#}.@footnote{@rlearning{Scheme tutorial}, contains a short tutorial
on entering numbers, lists, strings, and symbols in Scheme.}
@menu
-* Automatic notation::
* Interpretation contexts::
* The \override command::
@end menu
-@node Automatic notation
-@section Automatic notation
-
-This section describes how to change the way that accidentals and
-beams are automatically displayed.
-
-@menu
-* Automatic accidentals::
-* Setting automatic beam behavior::
-@end menu
-
-@node Automatic accidentals
-@subsection Automatic accidentals
-@cindex Automatic accidentals
-
-Common rules for typesetting accidentals have been placed in a
-function. This function is called as follows
-
-@funindex set-accidental-style
-@example
-#(set-accidental-style 'STYLE #('CONTEXT#))
-@end example
-
-The function can take two arguments: the name of the accidental style,
-and an optional argument that denotes the context that should be
-changed. If no context name is supplied, @code{Staff} is the default,
-but you may wish to apply the accidental style to a single @code{Voice}
-instead.
-
-@c TODO: we should create a very clear example, and show every
-@c accidental style on that example (with the example specially
-@c constructed so that it illustrates all the differences). -gp
-
-The following accidental styles are supported
-@table @code
-@item default
-This is the default typesetting behavior. It corresponds
-to 18th century common practice: Accidentals are
-remembered to the end of the measure in which they occur and
-only on their own octave.
-
-@item voice
-The normal behavior is to remember the accidentals on
-Staff-level. This variable, however, typesets accidentals
-individually for each voice. Apart from that, the rule is similar to
-@code{default}.
-
-As a result, accidentals from one voice do not get canceled in other
-voices, which is often an unwanted result
-
-@lilypond[quote,ragged-right,relative=1,fragment,verbatim]
-\new Staff <<
- #(set-accidental-style 'voice)
- <<
- { es g } \\
- { c, e }
->> >>
-@end lilypond
-
-The @code{voice} option should be used if the voices
-are to be read solely by individual musicians. If the staff is to be
-used by one musician (e.g., a conductor) then
-@code{modern} or @code{modern-cautionary}
-should be used instead.
-
-@item modern
-@funindex modern style accidentals
-This rule corresponds to the common practice in the 20th century. This rule
-prints the same accidentals as @code{default}, but temporary
-accidentals also are canceled in other octaves. Furthermore,
-in the same octave, they also get canceled in the following
-measure
-
-@lilypond[quote,ragged-right,fragment,verbatim]
-#(set-accidental-style 'modern)
-cis' c'' cis'2 | c'' c'
-@end lilypond
-
-@item @code{modern-cautionary}
-@funindex modern-cautionary
-This rule is similar to @code{modern}, but the @q{extra} accidentals
-(the ones not typeset by @code{default}) are typeset as cautionary
-accidentals. They are printed in reduced size or with parentheses
-@lilypond[quote,ragged-right,fragment,verbatim]
-#(set-accidental-style 'modern-cautionary)
-cis' c'' cis'2 | c'' c'
-@end lilypond
-
-@funindex modern-voice
-@item modern-voice
-This rule is used for multivoice accidentals to be read both by musicians
-playing one voice and musicians playing all voices. Accidentals are
-typeset for each voice, but they @emph{are} canceled across voices in
-the same @internalsref{Staff}.
-
-@funindex modern-voice-cautionary
-@item modern-voice-cautionary
-This rule is the same as @code{modern-voice}, but with the extra
-accidentals (the ones not typeset by @code{voice}) typeset
-as cautionaries. Even though all accidentals typeset by
-@code{default} @emph{are} typeset by this variable,
-some of them are typeset as cautionaries.
-
-@item piano
-@funindex piano accidentals
-This rule reflects 20th century practice for piano notation. Very similar to
-@code{modern} but accidentals also get canceled
-across the staves in the same @internalsref{GrandStaff} or
-@internalsref{PianoStaff}.
-
-@item piano-cautionary
-@funindex #(set-accidental-style 'piano-cautionary)
-Same as @code{#(set-accidental-style 'piano)} but with the extra
-accidentals typeset as cautionaries.
-
-@item no-reset
-@funindex no-reset accidental style
-This is the same as @code{default} but with accidentals lasting
-@q{forever} and not only until the next measure
-@lilypond[quote,ragged-right,fragment,verbatim,relative=1]
-#(set-accidental-style 'no-reset)
-c1 cis cis c
-@end lilypond
-
-@item forget
-This is sort of the opposite of @code{no-reset}: Accidentals
-are not remembered at all -- and hence all accidentals are
-typeset relative to the key signature, regardless of what was
-before in the music
-
-@lilypond[quote,ragged-right,fragment,verbatim,relative=1]
-#(set-accidental-style 'forget)
-\key d\major c4 c cis cis d d dis dis
-@end lilypond
-@end table
-
-
-@seealso
-
-Program reference: @internalsref{Accidental_engraver},
-@internalsref{Accidental}, and @internalsref{AccidentalPlacement}.
-
-
-@refbugs
-
-Simultaneous notes are considered to be entered in sequential
-mode. This means that in a chord the accidentals are typeset as if the
-notes in the chord happen one at a time, in the order in which
-they appear in the input file. This is a problem when accidentals
-in a chord depend on each other,
-which does not happen for the default accidental style. The problem
-can be solved by manually inserting @code{!} and @code{?} for the
-problematic notes.
-
-
-@node Setting automatic beam behavior
-@subsection Setting automatic beam behavior
-
-@funindex autoBeamSettings
-@funindex (end * * * *)
-@funindex (begin * * * *)
-@cindex automatic beams, tuning
-@cindex tuning automatic beaming
-
-@c [TODO: use \applyContext]
-
-In normal time signatures, automatic beams can start on any note but can
-only end in a few positions within the measure: beams can end on a beat,
-or at durations specified by the properties in
-@code{autoBeamSettings}. The properties in @code{autoBeamSettings}
-consist of a list of rules for where beams can begin and end. The
-default @code{autoBeamSettings} rules are defined in
-@file{scm/@/auto@/-beam@/.scm}.
-
-In order to add a rule to the list, use
-@example
-#(override-auto-beam-setting '(be p q n m) a b [context])
-@end example
-
-@itemize @bullet
-
-@item @code{be} is either "begin" or "end".
-
-@item @code{p/q} is the duration of the note for which you want
-to add a rule. A beam is considered to have the duration of its
-shortest note. Set @code{p} and @code{q} to @code{'*'} to
-have this apply to any beam.
-
-@item @code{n/m} is the time signature to which
-this rule should apply. Set @code{n} and @code{m} to @code{'*'}
-to have this apply in any time signature.
-
-@item @code{a/b} is the position in the bar at which the beam should
-begin/end.
-
-@item @code{context} is optional, and it specifies the context at which
-the change should be made. The default is @code{'Voice}.
-@code{#(score-override-auto-beam-setting '(A B C D) E F)} is equivalent to
-@code{#(override-auto-beam-setting '(A B C D) E F 'Score)}.
-
-@end itemize
-
-For example, if automatic beams should always end on the first quarter
-note, use
-
-@example
-#(override-auto-beam-setting '(end * * * *) 1 4)
-@end example
-
-You can force the beam settings to only take effect on beams whose shortest
-note is a certain duration
-
-@lilypond[quote,fragment,ragged-right,verbatim,relative=2]
-\time 2/4
-#(override-auto-beam-setting '(end 1 16 * *) 1 16)
-a16 a a a a a a a |
-a32 a a a a16 a a a a a |
-#(override-auto-beam-setting '(end 1 32 * *) 1 16)
-a32 a a a a16 a a a a a |
-@end lilypond
-
-You can force the beam settings to only take effect in certain time
-signatures
-
-@lilypond[quote,fragment,ragged-right,verbatim,relative=2]
-\time 5/8
-#(override-auto-beam-setting '(end * * 5 8) 2 8)
-c8 c d d d
-\time 4/4
-e8 e f f e e d d
-\time 5/8
-c8 c d d d
-@end lilypond
-
-You can also remove a previously set beam-ending rule by using
-
-@example
-#(revert-auto-beam-setting '(be p q n m) a b [context])
-@end example
-
-@noindent
-be, p, q, n, m, a, b and context are the same as above. Note that the
-default rules are specified in @file{scm/@/auto@/-beam@/.scm},
-so you can revert rules that you did not explicitly create.
-
-@lilypond[quote,fragment,ragged-right,verbatim,relative=2]
-\time 4/4
-a16 a a a a a a a a a a a a a a a
-#(revert-auto-beam-setting '(end 1 16 4 4) 1 4)
-a16 a a a a a a a a a a a a a a a
-@end lilypond
-
-The rule in a revert-auto-beam-setting statement must exactly match the
-original rule. That is, no wildcard expansion is taken into account.
-
-@lilypond[quote,fragment,ragged-right,verbatim,relative=2]
-\time 1/4
-#(override-auto-beam-setting '(end 1 16 1 4) 1 8)
-a16 a a a
-#(revert-auto-beam-setting '(end 1 16 * *) 1 8) % this won't revert it!
-a a a a
-#(revert-auto-beam-setting '(end 1 16 1 4) 1 8) % this will
-a a a a
-@end lilypond
-
-
-
-@c TODO: old material -- not covered by above stuff, I think.
-If automatic beams should end on every quarter in 5/4 time, specify
-all endings
-@example
-#(override-auto-beam-setting '(end * * * *) 1 4 'Staff)
-#(override-auto-beam-setting '(end * * * *) 1 2 'Staff)
-#(override-auto-beam-setting '(end * * * *) 3 4 'Staff)
-#(override-auto-beam-setting '(end * * * *) 5 4 'Staff)
-@dots{}
-@end example
-
-The same syntax can be used to specify beam starting points. In this
-example, automatic beams can only end on a dotted quarter note
-@example
-#(override-auto-beam-setting '(end * * * *) 3 8)
-#(override-auto-beam-setting '(end * * * *) 1 2)
-#(override-auto-beam-setting '(end * * * *) 7 8)
-@end example
-In 4/4 time signature, this means that automatic beams could end only on
-3/8 and on the fourth beat of the measure (after 3/4, that is 2 times
-3/8, has passed within the measure).
-
-If any unexpected beam behaviour occurs, check the default automatic beam
-settings in @file{scm/@/auto@/-beam@/.scm}
-for possible interference, because the beam
-endings defined there will still apply on top of your own overrides. Any
-unwanted endings in the default vales must be reverted for your time
-signature(s).
-
-For example, to typeset @code{(3 4 3 2)}-beam endings in 12/8, begin
-with
-
-@example
-%%% revert default values in scm/auto-beam.scm regarding 12/8 time
-#(revert-auto-beam-setting '(end * * 12 8) 3 8)
-#(revert-auto-beam-setting '(end * * 12 8) 3 4)
-#(revert-auto-beam-setting '(end * * 12 8) 9 8)
-
-%%% your new values
-#(override-auto-beam-setting '(end 1 8 12 8) 3 8)
-#(override-auto-beam-setting '(end 1 8 12 8) 7 8)
-#(override-auto-beam-setting '(end 1 8 12 8) 10 8)
-@end example
-
-@cindex automatic beam generation
-@cindex autobeam
-@funindex autoBeaming
-@cindex lyrics
-
-If beams are used to indicate melismata in songs, then automatic
-beaming should be switched off with @code{\autoBeamOff}.
-
-
-@refcommands
-
-@funindex \autoBeamOff
-@code{\autoBeamOff},
-@funindex \autoBeamOn
-@code{\autoBeamOn}.
-
-@commonprop
-
-Beaming patterns may be altered with the @code{beatGrouping} property,
-
-@lilypond[quote,verbatim,relative=2,fragment,ragged-right]
-\time 5/16
-\set beatGrouping = #'(2 3)
-c8[^"(2+3)" c16 c8]
-\set beatGrouping = #'(3 2)
-c8[^"(3+2)" c16 c8]
-@end lilypond
-
-
-@refbugs
-
-If a score ends while an automatic beam has not been ended and is
-still accepting notes, this last beam will not be typeset at all. The
-same holds polyphonic voices, entered with @code{<< @dots{} \\ @dots{}
->>}. If a polyphonic voice ends while an automatic beam is still
-accepting notes, it is not typeset.
-
-
@node Interpretation contexts
@section Interpretation contexts
* Changing context default settings::
* Defining new contexts::
* Aligning contexts::
+* Vertical grouping of grobs::
@end menu
@subsection Contexts explained
When music is printed, a lot of notational elements must be added to the
-input. For example, compare the input and output of the following example:
+output. For example, compare the input and output of the following example:
@lilypond[quote,verbatim,relative=2,fragment]
cis4 cis2. g4
entire score.
Within LilyPond, these rules and bits of information are grouped in
-@emph{Contexts}. Some examples of contexts are @context{Voice},
-@context{Staff}, and @context{Score}. They are hierarchical, for
-example: a @context{Staff} can contain many @context{Voice}s, and a
-@context{Score} can contain many @context{Staff} contexts.
+@emph{Contexts}. Some examples of contexts are @code{Voice},
+@code{Staff}, and @code{Score}. They are hierarchical, for
+example: a @code{Staff} can contain many @code{Voice}s, and a
+@code{Score} can contain many @code{Staff} contexts.
@quotation
-@image{context-example,5cm,,}
+@sourceimage{context-example,5cm,,}
@end quotation
Each context has the responsibility for enforcing some notation rules,
creating some notation objects and maintaining the associated
-properties. For example, the @context{Voice} context may introduce an
-accidental and then the @context{Staff} context maintains the rule to
+properties. For example, the @code{Voice} context may introduce an
+accidental and then the @code{Staff} context maintains the rule to
show or suppress the accidental for the remainder of the measure. The
-synchronization of bar lines is handled at @context{Score} context.
+synchronization of bar lines is handled at @code{Score} context.
However, in some music we may not want the bar lines to be
synchronized -- consider a polymetric score in 4/4 and 3/4 time. In
-such cases, we must modify the default settings of the @context{Score}
-and @context{Staff} contexts.
+such cases, we must modify the default settings of the @code{Score}
+and @code{Staff} contexts.
For very simple scores, contexts are created implicitly, and you need
not be aware of them. For larger pieces, such as anything with more
@internalsref{Contexts}.
@end ifhtml
@ifnothtml
-Translation @arrow{} Context.
+Translation @expansion{} Context.
@end ifnothtml
@c [TODO: describe propagation]
created automatically. For more complex scores, it is necessary to
create them by hand. There are three commands that do this.
-@itemize @bullet
+@itemize
@item
The easiest command is @code{\new}, and it also the quickest to type.
arts = @{ s4-. s4-> @}
@end example
-They are combined by sending both to the same @context{Voice} context,
+They are combined by sending both to the same @code{Voice} context,
@example
<<
This variant is used with music expressions that can be interpreted at
several levels. For example, the @code{\applyOutput} command (see
@ref{Running a function on all layout objects}). Without an explicit
-@code{\context}, it is usually applied to @context{Voice}
+@code{\context}, it is usually applied to @code{Voice}
@example
\applyOutput #'@var{context} #@var{function} % apply to Voice
@end example
-To have it interpreted at the @context{Score} or @context{Staff} level use
+To have it interpreted at the @code{Score} or @code{Staff} level use
these forms
@example
this case, it is @code{#t}, the boolean True value.
If the @var{context} argument is left out, then the current bottom-most
-context (typically @context{ChordNames}, @context{Voice}, or
-@context{Lyrics}) is used. In this example,
+context (typically @code{ChordNames}, @code{Voice}, or
+@code{Lyrics}) is used. In this example,
@lilypond[quote,verbatim,relative=2,fragment]
c8 c c c
@end lilypond
Contexts are hierarchical, so if a bigger context was specified, for
-example @context{Staff}, then the change would also apply to all
-@context{Voice}s in the current stave. The change is applied
+example @code{Staff}, then the change would also apply to all
+@code{Voice}s in the current stave. The change is applied
@q{on-the-fly}, during the music, so that the setting only affects the
second group of eighth notes.
@internalsref{Tunable context properties}.
@end ifhtml
@ifnothtml
-Translation @arrow{} Tunable context properties.
+Translation @expansion{} Tunable context properties.
@end ifnothtml
@internalsref{Engravers}.
@end ifhtml
@ifnothtml
-Program reference @arrow Translation @arrow{} Engravers.
+Internals Reference @expansion{} Translation @expansion{} Engravers.
@end ifnothtml
Every context described in
@ifhtml
@internalsref{Contexts}
@end ifhtml
@ifnothtml
-Program reference @arrow Translation @arrow{} Context.
+Internals Reference @expansion{} Translation @expansion{} Context.
@end ifnothtml
lists the engravers used for that context.
is a rather crude method of making objects disappear since it will affect
the entire staff. This method also influences the spacing, which may or
may not be desirable. A more
-sophisticated method of blanking objects is shown in @ref{Common tweaks}.
+sophisticated method of blanking objects is shown in @rlearning{Common tweaks}.
The next example shows a practical application. Bar lines and time
signatures are normally synchronized across the score. This is done
@code{NoteHead}, and @var{property} is an internal variable of the
formatting system (@q{grob property} or @q{layout property}). The latter is a
symbol, so it must be quoted. The subsection @ref{Constructing a
-tweak} explains what to fill in for @var{name}, @var{property}, and
+tweak}, explains what to fill in for @var{name}, @var{property}, and
@var{value}. Here we only discuss the functionality of this command.
The command
@noindent
makes stems thicker (the default is 1.3, with staff line thickness as a
-unit). Since the command specifies @context{Staff} as context, it only
+unit). Since the command specifies @code{Staff} as context, it only
applies to the current staff. Other staves will keep their normal
appearance. Here we see the command in action:
@end lilypond
The @code{\override} command changes the definition of the @code{Stem}
-within the current @context{Staff}. After the command is interpreted
+within the current @code{Staff}. After the command is interpreted
all stems are thickened.
Analogous to @code{\set}, the @var{context} argument may be left out,
-causing it to default to @context{Voice}, and adding @code{\once} applies
-the change during one timestep only
+causing the default context @code{Voice} to be used. Adding
+@code{\once} applies the change during one timestep only.
@lilypond[quote,fragment,verbatim,relative=2]
c4
@}
@end example
-Here @code{\Staff} takes the existing definition for context @context{Staff} from the
-identifier @code{\Staff}.
+The @code{\Staff} command brings in the existing definition of the
+staff context so that it can be modified.
The statements
@example
The @code{\RemoveEmptyStaffContext} will overwrite your current
@code{\Staff} settings. If you wish to change the defaults for a
staff which uses @code{\RemoveEmptyStaffContext}, you must do so
-after calling @code{\RemoveemptyStaffContext}, ie
+after calling @code{\RemoveEmptyStaffContext}, ie
@example
\layout @{
@node Defining new contexts
@subsection Defining new contexts
-Specific contexts, like @context{Staff} and @code{Voice}, are made of
+Specific contexts, like @code{Staff} and @code{Voice}, are made of
simple building blocks. It is possible to create new types of
contexts with different combinations of engraver plug-ins.
The next example shows how to build a different type of
-@context{Voice} context from scratch. It will be similar to
-@code{Voice}, but only prints centered slash noteheads. It can be used
+@code{Voice} context from scratch. It will be similar to
+@code{Voice}, but only prints centered slash note heads. It can be used
to indicate improvisation in jazz pieces,
@lilypond[quote,ragged-right]
@}
@end example
-In the following discussion, the example input shown should go on the
-@dots{} in the previous fragment.
+In the following discussion, the example input shown should go in place
+of the @dots{} in the previous fragment.
-First the context's name is defined. Instead of @context{Voice} it
-will be called @context{ImproVoice},
+First it is necessary to define a name for the new context:
@example
\name ImproVoice
@end example
-Since it is similar to the @context{Voice}, we want commands that work
-on (existing) @context{Voice}s to remain working. This is achieved by
-giving the new context an alias @context{Voice},
+Since it is similar to the @code{Voice}, we want commands that work
+on (existing) @code{Voice}s to remain working. This is achieved by
+giving the new context an alias @code{Voice},
@example
\alias Voice
@end example
-The context will print notes, and instructive texts
+The context will print notes and instructive texts, so we need to add
+the engravers which provide this functionality,
@example
\consists Note_heads_engraver
\consists Text_engraver
@end example
-but only on the center line,
+but we only need this on the center line,
@example
\consists Pitch_squash_engraver
@end example
@funindex \accepts
-Contexts form hierarchies. We want to hang the @context{ImproVoice}
-under @context{Staff}, just like normal @code{Voice}s. Therefore, we
+Contexts form hierarchies. We want to hang the @code{ImproVoice}
+under @code{Staff}, just like normal @code{Voice}s. Therefore, we
modify the @code{Staff} definition with the @code{\accepts}
command,
@subsection Aligning contexts
New contexts may be aligned above or below exisiting contexts. This
-could be useful in setting up a vocal staff (@ref{Vocal ensembles}) and
+could be useful in setting up a vocal staff (@rlearning{Vocal ensembles}) and
in ossia,
+FIXME: this section doens't work in pdf. (?)
+
@cindex ossia
@findex alignAboveContext
@findex alignBelowContext
@end lilypond
+@node Vertical grouping of grobs
+@subsection Vertical grouping of grobs
+
+The VerticalAlignment and VerticalAxisGroup grobs work together.
+VerticalAxisGroup groups together different grobs like Staff, Lyrics,
+etc. VerticalAlignment then vertically aligns the different grobs
+grouped together by VerticalAxisGroup. There is usually only one
+VerticalAlignment per score but every Staff, Lyrics, etc. has its own
+VerticalAxisGroup.
+
@node The \override command
-@section The \override command
+@section The @code{\override} command
In the previous section, we have already touched on a command that
changes layout details: the @code{\override} command. In this section,
-we will look in more detail at how to use the command in practice.
+we will look in more detail at how to use the command in practice. The
+general syntax of this command is:
+
+@example
+\override @var{context}.@var{layout_object} #'@var{layout_property} = #@var{value}
+@end example
+This will set the @var{layout_property} of the specified @var{layout_object},
+which is a member of the @var{context}, to the @var{value}.
@menu
* Constructing a tweak::
* Layout interfaces::
* Determining the grob property::
* Objects connected to the input::
-* \set vs. \override::
+* Using Scheme code instead of \tweak::
+* \set versus \override::
* Difficult tweaks::
@end menu
@end example
@noindent
-This means that we must determine these bits of information:
+To construct this tweak we must determine these bits of information:
@itemize
-@item the context: here @context{Voice}.
+@item the context: here @code{Voice}.
@item the layout object: here @code{Stem}.
@item the layout property: here @code{thickness}.
@item a sensible value: here @code{3.0}.
@funindex \override
@cindex internal documentation
+For many properties, regardless of the data type of the property, setting the
+property to false ( @code{##f} ) will result in turning it off, causing
+Lilypond to ignore that property entirely. This is particularly useful for
+turning off grob properties which may otherwise be causing problems.
+
We demonstrate how to glean this information from the notation manual
and the program reference.
+
+
@node Navigating the program reference
@subsection Navigating the program reference
@quotation
@seealso
-Program reference: @internalsref{Fingering}.
+Internals Reference: @internalsref{Fingering}.
@end quotation
manual.
@end ignore
+@ifnothtml
+The programmer's reference is available as an HTML document. It is
+highly recommended that you read it in HTML form, either online or
+by downloading the HTML documentation. This section will be much more
+difficult to understand if you are using the
+PDF manual.
+@end ifnothtml
+
Follow the link to @internalsref{Fingering}. At the top of the
page, you will see
@internalsref{New_fingering_engraver}.
@end quotation
-By clicking around in the program reference, we can follow the
-flow of information within the program, following links like this:
+By following related links inside the program reference, we can follow the
+flow of information within the program:
-@itemize @bullet
+@itemize
@item @internalsref{Fingering}:
@internalsref{Fingering} objects are created by:
@end quotation
@noindent
-which means that the number will be kept at a distance of at least 0.6
+which means that the number will be kept at a distance of at least 0.5
of the note head.
typographical element. For example, the Fingering object
has the following aspects
-@itemize @bullet
+@itemize
@item
Its size is independent of the horizontal spacing, unlike slurs or beams.
@item
Horizontally, the center of the symbol should be aligned to the
-center of the notehead.
+center of the note head.
@item
Vertically, the symbol is placed next to the note and the staff.
We have been talking of @emph{the} @code{Fingering} object, but actually it
does not amount to much. The initialization file (see
-@ref{Default files})
+@rlearning{Default files})
@file{scm/@/define@/-grobs@/.scm} shows the soul of the @q{object},
@example
@noindent
As you can see, the @code{Fingering} object is nothing more than a
-bunch of variable settings, and the webpage in the Program Reference
+bunch of variable settings, and the webpage in the Internals Reference
is directly generated from this definition.
@end quotation
By increasing the value of @code{padding}, we can move the
-fingering away from the notehead. The following command inserts
+fingering away from the note head. The following command inserts
3 staff spaces of white
between the note and the fingering:
@example
@end lilypond
-In this case, the context for this tweak is @context{Voice}. This
+In this case, the context for this tweak is @code{Voice}. This
fact can also be deduced from the program reference, for the page for
the @internalsref{Fingering_engraver} plug-in says
@funindex \tweak
In some cases, it is possible to take a short-cut for tuning graphical
-objects. For objects that result directly from a piece of the input,
+objects. For objects that result directly from a piece of the input,
you can use the @code{\tweak} function, for example
@lilypond[relative=2,fragment,verbatim,ragged-right]
>4-\tweak #'padding #10 -.
@end lilypond
-As you can see, properties are set directly in the objects directly,
+As you can see, properties are set in the objects directly,
without mentioning the grob name or context where this should be
applied.
This technique only works for objects that are directly connected to
-an @internalsref{event} from the input, for example
+an @internalsref{Event} from the input, for example
-@itemize @bullet
-@item note heads, caused by chord-pitch (i.e., notes inside a chord).
-@item articulation signs, caused by articulation instructions.
+@itemize
+@item note heads, caused by chord-pitch (i.e., notes inside a chord)
+@item articulation signs, caused by articulation instructions
@end itemize
It notably does not work for stems and accidentals (these are caused
@end example
@noindent
-will not change color. See @ref{Displaying music expressions} for
+does not change color. See @ref{Displaying music expressions}, for
details.
-@node \set vs. \override
-@subsection \set vs. \override
+@node Using Scheme code instead of \tweak
+@subsection Using Scheme code instead of @code{\tweak}
+
+The main disadvantage of @code{\tweak} is its syntactical
+inflexibility. For example, the following produces a syntax error.
+
+@example
+F = \tweak #'font-size #-3 -\flageolet
+
+\relative c'' @{
+ c4^\F c4_\F
+@}
+@end example
+
+@noindent
+With other words, @code{\tweak} doesn't behave like an articulation
+regarding the syntax; in particular, it can't be attached with
+@code{^} and @code{_}.
+
+Using Scheme, this problem can be circumvented. The route to the
+result is given in @ref{Adding articulation to notes (example)},
+especially how to use @code{\displayMusic} as a helping guide.
+
+@example
+F = #(let ((m (make-music 'ArticulationEvent
+ 'articulation-type "flageolet")))
+ (set! (ly:music-property m 'tweaks)
+ (acons 'font-size -3
+ (ly:music-property m 'tweaks)))
+ m)
+
+\relative c'' @{
+ c4^\F c4_\F
+@}
+@end example
+
+@noindent
+Here, the @code{tweaks} properties of the flageolet object
+@code{m} (created with @code{make-music}) are extracted with
+@code{ly:music-property}, a new key-value pair to change the
+font size is prepended to the property list with the
+@code{acons} Scheme function, and the result is finally
+written back with @code{set!}. The last element of the
+@code{let} block is the return value, @code{m} itself.
+
+
+@node \set versus \override
+@subsection @code{\set} vs. @code{\override}
We have seen two methods of changing properties: @code{\set} and
@code{\override}. There are actually two different kinds of
@code{studlyCaps}. They mostly control the translation from
music to notatino, eg. @code{localKeySignature} (for determining
whether to print accidentals), @code{measurePosition} (for
-determining when to print a barline). Context properties can
+determining when to print a bar line). Context properties can
change value over time while interpreting a piece of music;
@code{measurePosition} is an obvious example of
this. Context properties are modified with @code{\set}.
There is a special type of context property: the element
-description. These properties are named in @code{StudlyCaps}
+description. These properties are named in @code{StudlyCaps}
(starting with capital letters). They contain the
@q{default settings} for said graphical object as an
association list. See @file{scm/@/define@/-grobs@/.scm}
There are a few classes of difficult adjustments.
-@itemize @bullet
+@itemize
@item
In the following example, we define a procedure
@code{my-callback}. This procedure
-@itemize @bullet
+@itemize
@item
determines if we have been split across line breaks
@item
@item Some objects cannot be changed with @code{\override} for
-technical reasons. Examples of those are @code{NonMusicalPaperColumn}
+technical reasons. Examples of those are @code{NonMusicalPaperColumn}
and @code{PaperColumn}. They can be changed with the
-@code{\outputProperty} function, which works similar to @code{\once
-\override}, but uses a different syntax,
+@code{\overrideProperty} function, which works similar to @code{\once
+\override}, but uses a different syntax.
@example
-\outputProperty
+\overrideProperty
#"Score.NonMusicalPaperColumn" % Grob name
#'line-break-system-details % Property name
#'((next-padding . 20)) % Value
@end example
+Note, however, that @code{\override}, applied to
+@code{NoteMusicalPaperColumn} and @code{PaperColumn}, still works as
+expected within @code{\context} blocks.
+
@end itemize
projects / lilypond.git / blobdiff