\input texinfo @c -*- coding: utf-8; mode: texinfo; documentlanguage: nl -*-
@c This file is part of notation.tely
@ignore
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@c -*- coding: utf-8; mode: texinfo; -*-
@c \version "2.12.0"
@node Changing defaults
@chapter Changing defaults

@untranslated


@c index Internals Reference
@c leave the @uref as one long line.
@c ode{#}.@footnote{@rlearning{Scheme tutorial}, contains a short tutorial
@menu
* Interpretation contexts::
* Explaining the Internals Reference::
* Modifying properties::
* Useful concepts and properties::
* Advanced tweaks::
@end menu

@node Interpretation contexts
@section Interpretation contexts

@untranslated


@menu
* Contexts explained::
* Creating contexts::
* Keeping contexts alive::
* Modifying context plug-ins::
* Changing context default settings::
* Defining new contexts::
* Aligning contexts::
@end menu

@node Contexts explained
@subsection Contexts explained

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@c TODO Rethink and rewrite
@c TODO Improve layout, order and consistency of wording -td
@c TODO Add introduction which explains contexts in generality  -td
@c TODO Describe propagation of property values -td
@menu
* Score - the master of all contexts::
* Top-level contexts - staff containers::
* Intermediate-level contexts - staves::
* Bottom-level contexts - voices::
@end menu

@node Score - the master of all contexts
@unnumberedsubsubsec Score - the master of all contexts

@untranslated


@c ode{\score @{@dots{}@}} or @code{\layout @{@dots{}@}} block is
@node Top-level contexts - staff containers
@unnumberedsubsubsec Top-level contexts - staff containers

@untranslated


@node Intermediate-level contexts - staves
@unnumberedsubsubsec Intermediate-level contexts - staves

@untranslated


@c ode{Voice} contexts.
@node Bottom-level contexts - voices
@unnumberedsubsubsec Bottom-level contexts - voices

@untranslated


@node Creating contexts
@subsection Creating contexts

@untranslated


@c TODO \new Score and \score
@c TODO more complete descriptions rather than learning style
@c index new contexts
@c index Context, creating
@c ode{Voice}).  This command creates a new context, and starts
@c ode{\new Staff}.
@c index creating contexts
@ref{Running a function on all layout objects}).  Without an explicit
@c ode{\context}, it is usually applied to @code{Voice}
@node Keeping contexts alive
@subsection Keeping contexts alive

@untranslated


@c index contexts, keeping alive
@c index contexts, lifetime
@c ode{\change} commands, associating lyrics with a voice with
@c ode{\lyricsto} commands, or when adding further musical events to
@c ode{Voice} contexts in a @code{Staff} context or in a
@c ode{<<...>>} construct will always persist to the end of the
@c ode{<<...>>} constructs.
@c index lyrics, aligning with sporadic melody
@node Modifying context plug-ins
@subsection Modifying context plug-ins

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@c TODO Should this be Modifying engravers or Modifying contexts?
@c ode{Note_head_engraver} and the @code{Staff} context contains a
@c ode{Key_signature_engraver}.
@c ode{Clef_engraver} from a @code{Staff} context,
@c ode{Staff} context, we can have a score where each staff has its own
@c index polymetric scores
@c index Time signatures, multiple
@c ode{Bar_engraver} must normally be first, and
@node Changing context default settings
@subsection Changing context default settings

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@c ode{Score}, @code{Staff} and @code{Voice} contexts may be specified
@c ode{Voice} contexts in a similar way.
@c ode{\Staff} settings.  If you wish to change the defaults for a
@c TODO: add \with in here.
@node Defining new contexts
@subsection Defining new contexts

@untranslated


@c ode{Voice} context from scratch.  It will be similar to
@c ode{Voice}, but only prints centered slash note heads.  It can be used
@c ode{\layout} block,
@node Aligning contexts
@subsection Aligning contexts

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@c TODO Better example needed.  Ref LM, and expand on it.
@c index ossia
@c index nested contexts
@c index contexts, nested
@node Explaining the Internals Reference
@section Explaining the Internals Reference

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@menu
* Navigating the program reference::
* Layout interfaces::
* Determining the grob property::
* Naming conventions::
@end menu

@node Navigating the program reference
@subsection Navigating the program reference

@untranslated


@c TODO remove this (it's in the LM)
@c Replace with more factual directions
@ref{Fingering instructions}), you will notice:
@quotation
@end quotation
@c outdated info; probably will delete.
@quotation
@end quotation
@quotation
@end quotation
@c ode{Fingering_engraver} plug-in will process them.
@c I can't figure out what this is supposed to mean.  -gp
@c old info?  it doesn't make any sense to me with our current docs.
@quotation
@end quotation
@c ode{Music definitions}
@node Layout interfaces
@subsection Layout interfaces

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@c index interface, layout
@c index layout interface
@c index grob
@c ode{Fingering} object.  For example, the page says
@quotation
@c ode{padding} (dimension, in staff space):
@c ode{0.5}
@end quotation
@quotation
@end quotation
@node Determining the grob property
@subsection Determining the grob property

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@c TODO remove this (it's in the LM)
@c Replace with more factual directions
@quotation
@c ode{side-position-interface}
@end quotation
@c index padding
@quotation
@end quotation
@quotation
@end quotation
@node Naming conventions
@subsection Naming conventions

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@node Modifying properties
@section Modifying properties

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@c TODO change the menu and subsection node names to use
@c backslash once the new macro to handle the refs
@c is available.  Need to find and change all refs at
@c the same time. -td
@menu
* Overview of modifying properties::
* The set command::
* The override command::
* The tweak command::
* set versus override::
@end menu

@node Overview of modifying properties
@subsection Overview of modifying properties

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@c ode{Stem} or @code{NoteHead}, and @var{property} is an internal
@c ode{\once} applies the change during one timestep only.
@c ode{Beam} comes after the Beam is started, so it has no effect.
@c ode{\revert} in the next example does not do anything.
@c leave this as a long long
@node The set command
@subsection The @code{\set} command

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@c index properties
@c index changing properties
@c ode{Lyrics}) is used.  In this example,
@c ode{Voice}s in the current stave.  The change is applied
@c index \once
@node The override command
@subsection The @code{\override} command

@untranslated


@c index internal documentation
@c index finding graphical objects
@c index graphical object descriptions
@c index tweaking
@c index internal documentation
@node The tweak command
@subsection The @code{\tweak} command

@untranslated


@c index tweaking
@c index chord, modifying one note in
@c ode{ChordEvent} event before the note, so separating the tweak
@c ode{ChordEvent} in the music stream, so remaining adjacent to the
@c TODO expand to include any further uses of \tweak
@c TODO add examples of these
@c ode{\tweak} command in the input stream by the automatic
@ref{Displaying music expressions}.
@c index tweaks in a variable
@c index tweaks in lyrics
@c index tweaking control points
@c index control points, tweaking
@node set versus override
@subsection @code{\set} vs. @code{\override}

@untranslated


@c ode{\override}.  There are actually two different kinds of
@c ode{studlyCaps}.  They mostly control the translation from
@c ode{measurePosition} is an obvious example of
@c ode{\override} is actually a shorthand;
@c leave this long line -gp
@c ode{dashed-words}.  The values of grob properties change
@c ode{fontSize} is a special property: it is equivalent to
@node Useful concepts and properties
@section Useful concepts and properties

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@menu
* Input modes::
* Direction and placement::
* Context layout order::
* Distances and measurements::
* Staff symbol properties::
* Spanners::
* Visibility of objects::
* Line styles::
* Rotating objects::
@end menu

@node Input modes
@subsection Input modes

@untranslated


@ref{Chord notation}.  Chords are rendered as notes on a staff.
@ref{Basic percussion notation}.
@ref{Entering figured bass}.
@ref{Default tablatures}.
@ref{Automatic fret diagrams} or you can enter them as a markup
@ref{Fret diagram markups}).
@c ode{\lyricsto} command which associates the following lyrics
@ref{Text markup commands}.
@c silly work-around for texinfo broken-ness
@c (@strong{Note...} causes a spurious cross-reference in Info)
@c ode{\notemode} command.  Input is interpreted as pitches,
@node Direction and placement
@subsection Direction and placement

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@c TODO Add table showing these
@c ode{DOWN} may be used instead of @code{1} and @code{-1}
@c ode{direction} to @code{0} or @code{CENTER}.  Alternatively,
@c ode{\xxxUp}, @code{xxxDown}, @code{xxxNeutral}
@c ode{1} or @code{RIGHT} means @qq{to the right}.  @code{0}
@node Context layout order
@subsection Context layout order

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@c index contexts, layout order
@node Distances and measurements
@subsection Distances and measurements

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@c index distances, absolute
@c index distances, scaled
@c ode{\in}@tie{}(inches), or @code{\pt}@tie{}(points, 1/72.27
@c ode{\staff-space} to the quantity.
@c ode{StaffSymbol}.  Scaled distances automatically scale with any
@c ode{staff-space} property of @code{StaffSymbol}, but fonts scale
@c ode{staff-space} property of @code{StaffSymbol} and the size of
@c ode{staff-space}.  For an explanation and an example of its use,
@ref{Page formatting},
@ref{Setting the staff size}.
@node Staff symbol properties
@subsection Staff symbol properties

@untranslated


@c index adjusting staff symbol
@c index drawing staff symbol
@c index staff symbol, setting of
@c TODO Extend or remove this section.  See also NR 1.6.2 Staff symbol
@c Need to think of uses for these properties.  Eg 'line-positions
@c is used in a snippet to thicken centre line.
@c If retained, add @ref to here in 1.6.2  -td
@c ode{'line-count} property.  The number of staff lines is
@node Spanners
@subsection Spanners

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@unnumberedsubsubsec Using the @code{spanner-interface}
@c ode{minimum-length} property.  Increasing this usually has the
@c ode{springs-and-rods} property is set:
@c ode{to-barline}.  By default this is true, causing hairpins and
@unnumberedsubsubsec Using the @code{line-spanner-interface}
@c ode{ly:line-interface::print}.  This routine determines the
@c ode{right} sub-lists of the @code{bound-details} property
@c ode{LEFT}) makes the line start/end at the left side of the note
@c ode{Y} sub-properties.  Setting either @code{stencil-align-dir-y}
@c ode{DOWN} means align the @emph{bottom} edge of the text with
@node Visibility of objects
@subsection Visibility of objects

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@c index objects, visibility of
@c index grobs, visibility of
@c index visibility of objects
@c ode{break-visibility} property can be overridden.  The first
@menu
* Removing the stencil::
* Making objects transparent::
* Painting objects white::
* Using break-visibility::
* Special considerations::
@end menu

@node Removing the stencil
@unnumberedsubsubsec Removing the stencil

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@c index stencil, removing
@c ode{\revert}.
@node Making objects transparent
@unnumberedsubsubsec Making objects transparent

@untranslated


@c index transparent, making objects
@node Painting objects white
@unnumberedsubsubsec Painting objects white

@untranslated


@c index objects, coloring
@c index coloring objects
@c index layers
@c index printing order
@c index overwriting objects
@c index objects, overwriting
@c index grobs, overwriting
@c ode{1}, although a few objects, including @code{StaffSymbol} and
@c ode{BarLine}, are assigned a value of @code{0}.  The order of
@c ode{layer} value @code{0}), so overwriting them.  To change this,
@c ode{layer}, say @code{-1}, so that it is drawn earlier:
@node Using break-visibility
@unnumberedsubsubsec Using break-visibility

@untranslated


@c TODO Add making other objects breakable
@c index break-visibility
@c ode{break-visibility} property to control their visibility
@c Leave this ref on a newline - formats incorrectly otherwise -td
@c omit Ambitus as it appears not to be affected by break-visibility -td
@c @item @code{Ambitus}          @tab as specified   @tab @code{begin-of-line-visible}
@c omit the following item until it can be explained -td
@c @item @code{BreakAlignGroup}  @tab @code{Score}          @tab calculated
@c omit KeyCancellation until it can be explained -td
@c @item @code{KeyCancellation}  @tab ??             @tab @code{begin-of-line-invisible}
@c omit LeftEdge until it can be explained -td
@c @item @code{LeftEdge}         @tab @code{Score}          @tab @code{center-invisible}
@c ode{break-visibility} must be present, not all of them are
@node Special considerations
@unnumberedsubsubsec Special considerations

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@c index key signature, visibility following explicit change
@c index explicitKeySignatureVisibility
@c index clef, visibility following explicit change
@c index explicitClefVisibility
@c ode{explicitClefVisibility} properties.  These are the equivalent
@c ode{break-visibility}.  Both are properties of the Staff context,
@c ode{\set} command.  Both are set by default to @code{all-visible}.
@c ode{break-visibility} must still be overridden in the appropriate
@c TODO Add visibility of cautionary accidentals before notes
@c index automaticBars
@c index bar lines, suppressing
@c TODO Add example
@c index octavated clefs, visibility of
@c index visibility of octavated clefs
@c index clefs, visibility of octavation
@c ode{OctavateEight} layout object.  Its visibility is controlled
@node Line styles
@subsection Line styles

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@c ode{ly:line-interface::print}.  This routine determines the
@c FIXME Complete
@c ode{left} instead of @code{right}.
@ref{Spanners}.
@node Rotating objects
@subsection Rotating objects

@untranslated


@menu
* Rotating layout objects::
* Rotating markup::
@end menu

@node Rotating layout objects
@unnumberedsubsubsec Rotating layout objects

@untranslated


@c index rotating objects
@c index objects, rotating
@c index hairpins, angled
@c index angled hairpins
@node Rotating markup
@unnumberedsubsubsec Rotating markup

@untranslated


@c ode{outside-staff-priority} property for text is set to @code{#f}
@node Advanced tweaks
@section Advanced tweaks

@untranslated


@menu
* Aligning objects::
* Vertical grouping of grobs::
* Modifying stencils::
* Modifying shapes::
@end menu

@ref{Explaining the Internals Reference},
@ref{Modifying properties},
@ref{Interfaces for programmers}.
@node Aligning objects
@subsection Aligning objects

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@c ode{X-offset} and @code{Y-offset} properties.  The value of
@c ode{X-offset} gives the displacement from the x coordinate of
@c ode{Y-offset} gives the displacement from the center line of the
@c ode{Y-offset} may be set directly or may be set to be calculated
@c ode{self-alignment-interface}.}
@c ode{X-offset} have no effect.
@menu
* Setting @code{X-offset} and @code{Y-offset} directly::
* Using the @code{side-position-interface}::
* Using the @code{self-alignment-interface}::
* Using the @code{break-alignable-interface}::
@end menu

@node Setting @code{X-offset} and @code{Y-offset} directly
@unnumberedsubsubsec Setting @code{X-offset} and @code{Y-offset} directly

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@c TODO write more
@node Using the @code{side-position-interface}
@unnumberedsubsubsec Using the @code{side-position-interface}

@untranslated


@c TODO add an example of each to the table
@c TODO Add examples
@node Using the @code{self-alignment-interface}
@unnumberedsubsubsec Using the @code{self-alignment-interface}

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@c ode{self-alignment-interface} is controlled by the value of
@c ode{X-offset} property is set to
@c ode{ly:self-alignment-interface::x-aligned-on-self}.
@c ode{self-alignment-X}  may be given any
@c ode{CENTER} and @code{RIGHT} may be used instead of the values
@c ode{-1, 0, 1} respectively.
@c ode{ly:self-alignment-interface::y-aligned-on-self}.  However,
@c ode{CENTER}, @code{UP} may be substituted for @code{-1, 0, 1}
@unnumberedsubsubsec Using the @code{aligned-on-parent} procedures
@c Cannot document as they do not seem to operate consistently on all objects -td
@c TODO investigate further
@c TODO Add example
@unnumberedsubsubsec Using the @code{centered-on-parent} procedures
@c Cannot document as they do not seem to operate consistently on all objects -td
@c TODO investigate further
@c TODO The align-interface, BassFigureAlignment and VerticalAlignment
@node Using the @code{break-alignable-interface}
@unnumberedsubsubsec Using the @code{break-alignable-interface}

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@c index align to objects
@c index break-align-symbols
@c ode{breathing-sign}, @code{clef}, @code{custos}, @code{staff-bar},
@c ode{left-edge}, @code{key-cancellation}, @code{key-signature}, and
@c ode{time-signature}.
@node Vertical grouping of grobs
@subsection Vertical grouping of grobs

@untranslated


@c FIXME Expand this section
@node Modifying stencils
@subsection Modifying stencils

@untranslated


@c ode{MultiMeasureRest} object is @code{ly:multi-measure-rest::print}.
@c ode{stencil} property to reference a different, specially-written,
@c ode{text} property to the object which is set to contain the
@ref{Graphic notation inside markup}.
@c ode{\musicglyph} markup command -- see @ref{The Feta font}.
@c TODO Add inserting eps files or ref to later
@c TODO Add inserting Postscript or ref to later
@ref{Graphic notation inside markup},
@ref{Formatting text},
@ref{Text markup commands},
@ref{The Feta font}.
@node Modifying shapes
@subsection Modifying shapes

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@menu
* Modifying ties and slurs::
@end menu

@node Modifying ties and slurs
@unnumberedsubsubsec Modifying ties and slurs

@untranslated


@c index slurs, modifying
@c index ties, modifying
@c index Bézier curves
@c index Bézier control points

@c -- SKELETON FILE --