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Defining an engraver in Scheme: ambitus engraver

This example demonstrates how the ambitus engraver may be defined on the user side, with a Scheme engraver. This is basically a rewrite in Scheme of …

…of some C++ methods used by the ambitus engraver. #(define (ly:separation-item::add-conditional-item grob grob-item) "Add @var{grob-item} … …ambitus direction)))) (list DOWN UP)) (ly:grob-suicide! ambitus-line)))) %%% %%% Ambitus engraver definition %%% #(define ambitus-engraver (lambda (context) (let ((ambitus … …is built, update the ambitus notes (acknowledgers ((note-head-interface engraver grob source-engraver) (if ambitus (update-ambitus-notes ambitus grob)))) ;; finally, …

This scheme engraver searches for specified successive intervals in a voice, … …invalid input or if other issues prevent the engraver from working correctly. Some examples: Warning: Color_interval_… …0.0 0.0)) Warning: Adding color_interval_engraver to a Staff context may lead to unexpected …

%%% Create an engraver that colors note heads depending on the %%% intervals … …UP #f ,red)) } } } \markup \column { "Output warning, if engraver has been added to staff instead of voice … …fis r } >> \layout { \context { \Staff \consists \color_interval_engraver #intervaldefs #`(("4" ,UP #f ,red) ("2-" ,DOWN …

…generate empty measures then remove the Bar_number_engraver from the Score context, and the Time_signature_engraver, Clef_engraver and Bar_engraver from the Staff context.

…indent = 0\in \context { \Staff \remove "Time_signature_engraver" \remove "Clef_engraver" \remove "Bar_engraver" } \context { \Score \remove "Bar_number_engraver" } } } % uncomment these lines for "letter" size %{ \paper { #(…

…generate empty measures then remove the Bar_number_engraver from the Score context, and the Time_signature_engraver, (optionally the Clef_engraver) and Bar_engraver from the Staff context.

…indent = 0\in \context { \Staff \remove "Time_signature_engraver" %\remove "Clef_engraver" \remove "Bar_engraver" } \context { \Score \remove "Bar_number_engraver" } } } \paper { ragged-last-bottom = ##f line-width = 7.5\in left-margin = …

…pedal mark styles. Finally, the snippet defines an engraver allowing you to show glide (glissando) marks, e.… …another, using the standard Lilypond \glide command. (The engraver for fingering glides should be disabled while pedal …

…10/14). To do this, add Pedal_glide_engraver to your staff, and use "\glide" between notes … …--------------------------------------------------------------------------- \new Staff = "pedal" % \with { \remove Staff_symbol_engraver } { \sectionLabel "Pedal glides with foot transition marks" \common_… …--------------------------------------------------------------------------- \new Staff = "pedal" % \with { \remove Staff_symbol_engraver } { \sectionLabel "Behaviour with potentially erroneous glides within a …

…Scheme code in this snippet provides a new engraver custom_accidental_placement_engraver that introduces a details subproperty flag called capture …

…impl lst 0)) #(define (custom_accidental_placement_engraver context) (define (grob-array->list x) (if (ly:grob-array? x) (… …placement 'accidental-grobs new-grobs) (ly:grob-set-parent! grob X placement))))) ((stop-translation-timestep engraver) (set! placement #f))))) \layout { \context { \Voice \consists #custom_accidental_placement_engraver % Make `NoteColumn` use `force-hshift` even if `ignore-collision` % is `…

You can move Bar_engraver and Span_bar_engraver to a different engraving context, if you want, …

…c1 } >> \layout { raggedright = ##t \context { \Lyrics \consists "Bar_engraver" \consists "Separating_line_group_engraver" \override VerticalAxisGroup.nonstaff-nonstaff-spacing.… …#'(-2 . 2) } \context{ \ChoirStaff \remove "Span_bar_engraver" } \context { \Staff \remove "Bar_engraver" } } }

…bar lines in each part, the Default_barline_engraver and Timing_translator are moved from the Score … …If bar numbers are required, the Bar_number_engraver should also be moved, since it relies on …

…context { \Score \remove "Timing_translator" \remove "Bar_number_engraver" \override SpacingSpanner.uniform-stretching = ##t \override SpacingSpanner.strict-note-spacing = ##t … …Timing_translator" } \context { \Voice \remove "Forbid_line_break_engraver" tupletFullLength = ##t } } Bassklarinette = \new Staff \with { \consists "Bar_number_engraver" barNumberVisibility = #(every-nth-bar-number-visible 2) \override BarNumber.break-visibility = #end-of-line-invisible } << \…

…been done by splitting the grouping Axis_group_engraver and creating functionality into separate contexts, but the …

…context { \Score \accepts StaffContainer \denies Staff } \context { \type Engraver_group \consists "Clef_engraver" \consists "Time_signature_engraver" \… …engraver" \remove "Separating_line_group_engraver" \remove "Clef_engraver" \remove "Time_signature_engraver" } } }

…handled by plugins. Each plugin is called an engraver. In this example, (some) engravers are switched on …

…empty staff and voice contexts MyStaff = \context { \type Engraver_group \name Staff \accepts Voice \defaultchild Voice } MyVoice = \… …Accidental_engraver \consists Bar_engraver \consists Time_signature_engraver \consists Key_engraver } \score { \topVoice \layout { \context { \MyStaff } \context { \MyVoice } } }