Sha256: d4f1b4d533798d7898a48d39444589f7a0f225c277bd071640f647148c911093

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Size: 786 Bytes

Versions: 9

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Stored size: 786 Bytes

Contents

# Module for style guidelines.
module HeadMusic::Style::Guidelines; end

# A counterpoint guideline
class HeadMusic::Style::Guidelines::MostlyConjunct < HeadMusic::Style::Annotation
  MESSAGE = "Use mostly conjunct motion."

  MINIMUM_CONJUNCT_PORTION = HeadMusic::GOLDEN_RATIO_INVERSE**2
  # ~38%
  # Fux is 5/13 for lydian cantus firmus

  def marks
    marks_for_skips_and_leaps if conjunct_ratio < MINIMUM_CONJUNCT_PORTION
  end

  private

  def marks_for_skips_and_leaps
    melodic_intervals
      .reject(&:step?)
      .map { |interval| HeadMusic::Style::Mark.for_all(interval.notes, fitness: HeadMusic::SMALL_PENALTY_FACTOR) }
  end

  def conjunct_ratio
    return 1 if melodic_intervals.empty?

    melodic_intervals.count(&:step?).to_f / melodic_intervals.length
  end
end

Version data entries

9 entries across 9 versions & 1 rubygems

Version Path
head_music-7.0.5 lib/head_music/style/guidelines/mostly_conjunct.rb
head_music-7.0.4 lib/head_music/style/guidelines/mostly_conjunct.rb
head_music-7.0.3 lib/head_music/style/guidelines/mostly_conjunct.rb
head_music-7.0.2 lib/head_music/style/guidelines/mostly_conjunct.rb
head_music-7.0.1 lib/head_music/style/guidelines/mostly_conjunct.rb
head_music-7.0.0 lib/head_music/style/guidelines/mostly_conjunct.rb
head_music-6.0.1 lib/head_music/style/guidelines/mostly_conjunct.rb
head_music-6.0.0 lib/head_music/style/guidelines/mostly_conjunct.rb
head_music-5.0.0 lib/head_music/style/guidelines/mostly_conjunct.rb