Sha256: c6b7cf4c21fa36aff52cf178691af6660ba427bb39d7e2105df1c012b3fcbbfd
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Size: 667 Bytes
Versions: 18
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Stored size: 667 Bytes
Contents
# frozen_string_literal: true
# Module for style guidelines.
module HeadMusic::Style::Guidelines; end
# A counterpoint guideline
class HeadMusic::Style::Guidelines::PreferContraryMotion < HeadMusic::Style::Annotation
MESSAGE = 'Prefer contrary motion. Move voices in different melodic directions.'
def marks
return nil if notes.length < 2
return nil if direct_motion_ratio <= 0.5
direct_motions.map { |motion| HeadMusic::Style::Mark.for_all(motion.notes) }
end
private
def direct_motions
motions.select(&:direct?)
end
def direct_motion_ratio
return 0 if motions.empty?
direct_motions.count / motions.count.to_f
end
end
Version data entries
18 entries across 18 versions & 1 rubygems