Class: HeadMusic::Style::Guidelines::FloridDissonanceTreatment

Inherits:
HeadMusic::Style::Guideline show all
Includes:
DissonanceFigureDetection
Defined in:
lib/head_music/style/guidelines/florid_dissonance_treatment.rb

Overview

Unified dissonance handling for mixed-species (florid) contexts. Judges each note at its attack: a dissonance attacked on a strong beat is a fault, and a weak-beat dissonance must be a passing tone, neighbor tone, nota cambiata, or double neighbor figure. A note held over into a dissonance starts on a weak beat and is consonant there, so it is never this guideline's concern; the suspension rule judges it.

Instance Method Summary collapse

Constructor Details

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

Instance Method Details

#all_consonant_with_cantus?(*checked_notes) ⇒ Boolean (private) Originally defined in module DissonanceFigureDetection

Returns:

  • (Boolean)

#cambiata_as_note_2?(index) ⇒ Boolean (private) Originally defined in module DissonanceFigureDetection

Returns:

  • (Boolean)

#cambiata_dissonance?(note) ⇒ Boolean (private) Originally defined in module DissonanceFigureDetection

Nota cambiata: a five-note figure where note 2 is dissonant, approached by step from note 1, leaps a third in the same direction to note 3, then notes 3-4-5 proceed stepwise in the opposite direction. Notes 1, 3, and 5 must be consonant with the CF.

Returns:

  • (Boolean)

#cambiata_shape?(n1, n2, n3, n4, n5) ⇒ Boolean (private) Originally defined in module DissonanceFigureDetection

Returns:

  • (Boolean)

#cantus_firmus_positions ⇒ Object (private) Originally defined in module DissonanceFigureDetection

#consonant_with_cantus?(note) ⇒ Boolean (private) Originally defined in module DissonanceFigureDetection

Returns:

  • (Boolean)

#dissonant_with_cantus?(note) ⇒ Boolean (private) Originally defined in module DissonanceFigureDetection

Returns:

  • (Boolean)

#double_neighbor_figure?(index, offset:) ⇒ Boolean (private) Originally defined in module DissonanceFigureDetection

Double neighbor: a four-note figure within one bar. Beats 1 and 4 are the same pitch (consonant), beats 2 and 3 are upper and lower neighbors connected by a leap of a third.

Returns:

  • (Boolean)

#double_neighbor_member?(note) ⇒ Boolean (private) Originally defined in module DissonanceFigureDetection

Returns:

  • (Boolean)

#double_neighbor_shape?(n1, n2, n3, n4) ⇒ Boolean (private) Originally defined in module DissonanceFigureDetection

Returns:

  • (Boolean)

#improperly_treated_notes ⇒ Object (private) 



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

def improperly_treated_notes
  notes.select { |note| dissonant_with_cantus?(note) && !properly_treated?(note) }
end

#marks ⇒ Object 



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# File 'lib/head_music/style/guidelines/florid_dissonance_treatment.rb', line 13

def marks
  return [] unless cantus_firmus&.notes&.any?

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

#melodic_interval_between(note1, note2) ⇒ Object (private) Originally defined in module DissonanceFigureDetection

#neighbor_tone?(note) ⇒ Boolean (private) Originally defined in module DissonanceFigureDetection

Returns:

  • (Boolean)

#on_strong_beat?(note) ⇒ Boolean (private)

Returns:

  • (Boolean) 


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# File 'lib/head_music/style/guidelines/florid_dissonance_treatment.rb', line 32

def on_strong_beat?(note)
  cantus_firmus_positions.include?(note.position.to_s)
end

#passing_tone?(note) ⇒ Boolean (private) Originally defined in module DissonanceFigureDetection

Returns:

  • (Boolean)

#properly_treated?(note) ⇒ Boolean (private)

Returns:

  • (Boolean) 


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# File 'lib/head_music/style/guidelines/florid_dissonance_treatment.rb', line 25

def properly_treated?(note)
  return false if on_strong_beat?(note)

  passing_tone?(note) || neighbor_tone?(note) ||
    cambiata_dissonance?(note) || double_neighbor_member?(note)
end

#steps_back_from?(leap, step_back_1, step_back_2) ⇒ Boolean (private) Originally defined in module DissonanceFigureDetection

Returns:

  • (Boolean)

#stepwise_figure?(note, same_direction:) ⇒ Boolean (private) Originally defined in module DissonanceFigureDetection

Returns:

  • (Boolean)