Sha256: 91d8dd83ba30eaf6789b2a44d4f4a60ca0bdd4b579a74c2ae9b8f1de2ae5064d
Contents?: true
Size: 815 Bytes
Versions: 18
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Stored size: 815 Bytes
Contents
# frozen_string_literal: true
# Module for style guidelines.
module HeadMusic::Style::Guidelines; end
# A counterpoint guideline
class HeadMusic::Style::Guidelines::PreferImperfect < HeadMusic::Style::Annotation
MESSAGE = 'Prefer imperfect harmonic intervals.'
def marks
HeadMusic::Style::Mark.for_all(perfect_intervals.map(&:notes).flatten) if ratio_of_perfect_intervals >= 0.5
end
private
def ratio_of_perfect_intervals
return 0 if downbeat_harmonic_intervals_in_middle.nil?
perfect_intervals.length.to_f / downbeat_harmonic_intervals.length
end
def perfect_intervals
downbeat_harmonic_intervals_in_middle.select { |interval| interval.perfect_consonance?(:two_part_harmony) }
end
def downbeat_harmonic_intervals_in_middle
downbeat_harmonic_intervals[1..-2]
end
end
Version data entries
18 entries across 18 versions & 1 rubygems