Class: HeadMusic::Style::Guidelines::OneToOneWithTies

Inherits:
Annotation
  • Object
show all
Defined in:
lib/head_music/style/guidelines/one_to_one_with_ties.rb

Overview

A counterpoint guideline for fourth species counterpoint. For each cantus firmus note, verifies that one or two counterpoint notes are sounding at that position. A note may sustain across the barline (syncopation) rather than starting at the CF note position. Two notes sounding against one CF note is permitted as a "second species break."

Constant Summary collapse

MESSAGE = 
"Place one note per cantus firmus note. Notes may sustain across the barline."

Instance Method Summary collapse

Constructor Details

This class inherits a constructor from HeadMusic::Style::Annotation

Instance Method Details

#marks ⇒ Object 



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# File 'lib/head_music/style/guidelines/one_to_one_with_ties.rb', line 12

def marks
  return unless cantus_firmus&.notes
  return if cantus_firmus.notes.empty?

  HeadMusic::Style::Mark.for_each(uncovered_cantus_firmus_notes)
end

#uncovered_cantus_firmus_notes ⇒ Object (private) 



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# File 'lib/head_music/style/guidelines/one_to_one_with_ties.rb', line 21

def uncovered_cantus_firmus_notes
  cantus_firmus.notes.select do |cf_note|
    notes_sounding = voice.notes_during(cf_note)
    notes_sounding.empty? || notes_sounding.length > 2
  end
end