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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::SingableIntervals < HeadMusic::Style::Annotation
PERMITTED_ASCENDING = %w[PU m2 M2 m3 M3 P4 P5 m6 P8].freeze
PERMITTED_DESCENDING = %w[PU m2 M2 m3 M3 P4 P5 P8].freeze
MESSAGE = 'Use only PU, m2, M2, m3, M3, P4, P5, m6 (ascending), P8 in the melodic line.'
def marks
melodic_intervals.reject { |interval| permitted?(interval) }.map do |unpermitted_interval|
HeadMusic::Style::Mark.for_all([unpermitted_interval.first_note, unpermitted_interval.second_note])
end
end
private
def permitted?(melodic_interval)
whitelist_for_interval(melodic_interval).include?(melodic_interval.shorthand)
end
def whitelist_for_interval(melodic_interval)
melodic_interval.ascending? ? PERMITTED_ASCENDING : PERMITTED_DESCENDING
end
end
Version data entries
21 entries across 21 versions & 1 rubygems