Class: HeadMusic::Style::Guidelines::EmbellishedSuspensionTreatment

Inherits:
SuspensionTreatment show all
Defined in:
lib/head_music/style/guidelines/embellished_suspension_treatment.rb

Overview

Fifth species lets the space between a suspension and its resolution be decorated. The resolution is still the note sounding on the bar's second strong beat, as in fourth species: a step down from the suspended pitch and consonant there, whether attacked on that beat or anticipated and held. What is attacked in between is FloridDissonanceTreatment's to judge.

Instance Method Summary collapse

Constructor Details

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

Instance Method Details

#resolution_position(cf_note) ⇒ Object (private)

The slot presupposes a suspension over a downbeat that lasts to the bar's second strong beat. A cantus note attacked off the downbeat or gone before that beat (a cantus firmus graded against a florid line), and a meter with no second strong beat, all get the strict rule instead.



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# File 'lib/head_music/style/guidelines/embellished_suspension_treatment.rb', line 27

def resolution_position(cf_note)
  position = cf_note.position
  return unless position.count == 1 && position.tick.zero?

  slot = (2..position.meter.counts_per_bar)
    .map { |count| HeadMusic::Content::Position.new(flow, "#{position.bar_number}:#{count}") }
    .detect(&:strong?)
  slot if slot&.within_placement?(cf_note)
end

#resolved?(cp_note, cf_note) ⇒ Boolean (private)

Returns:

  • (Boolean) 


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

def resolved?(cp_note, cf_note)
  position = resolution_position(cf_note)
  return super unless position

  resolution = voice.note_at(position)
  return false unless resolution

  melodic = HeadMusic::Analysis::MelodicInterval.new(cp_note, resolution)
  melodic.step? && melodic.descending? && consonant_at?(position)
end