Contents

# frozen_string_literal: true

# Module for Annotations.
module HeadMusic::Style::Annotations; end

# A counterpoint guideline
class HeadMusic::Style::Annotations::AvoidCrossingVoices < HeadMusic::Style::Annotation
  MESSAGE = 'Avoid crossing voices. Maintain the high-low relationship between voices.'

  def marks
    crossings.map do |crossing|
      HeadMusic::Style::Mark.for_all(crossing.notes)
    end
  end

  private

  def crossings
    harmonic_intervals.select do |harmonic_interval|
      harmonic_interval.pitch_orientation && harmonic_interval.pitch_orientation != predominant_pitch_orientation
    end
  end

  def predominant_pitch_orientation
    pitch_orientations.
      compact.
      group_by { |orientation| orientation }.
      max { |a, b| a[1].length <=> b[1].length }.
      first
  end

  def pitch_orientations
    harmonic_intervals.map(&:pitch_orientation).compact.uniq
  end
end

Version data entries

2 entries across 2 versions & 1 rubygems

Version	Path
head_music-0.19.0	lib/head_music/style/annotations/avoid_crossing_voices.rb
head_music-0.18.0	lib/head_music/style/annotations/avoid_crossing_voices.rb