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Contents
# frozen_string_literal: true
# Module for style guidelines.
module HeadMusic::Style::Guidelines; end
# A counterpoint guideline
class HeadMusic::Style::Guidelines::ApproachPerfectionContrarily < HeadMusic::Style::Annotation
MESSAGE = 'Approach perfect consonances by contrary motion.'
def marks
motions_to_perfect_consonance_approached_directly.map do |bad_motion|
HeadMusic::Style::Mark.for_all(bad_motion.notes)
end
end
private
def motions_to_perfect_consonance_approached_directly
motions_to_perfect_consonance.select(&:direct?)
end
def motions_to_perfect_consonance
motions.select do |motion|
motion.second_harmonic_interval.perfect_consonance?
end
end
# Side effect is that you can't enter a perfect consonance by skip in similar or parallel motion,
# which is a rule.
end
Version data entries
17 entries across 17 versions & 1 rubygems