class HeadMusic::Style::Guidelines::DirectionChanges
A melodic line should have direction changes.
Public Instance Methods
marks()
click to toggle source
# File lib/head_music/style/guidelines/direction_changes.rb, line 8 def marks return unless overage.positive? penalty_exponent = overage**0.5 HeadMusic::Style::Mark.for_all(notes, fitness: HeadMusic::PENALTY_FACTOR**penalty_exponent) end
Private Instance Methods
melodic_intervals_changing_direction()
click to toggle source
# File lib/head_music/style/guidelines/direction_changes.rb, line 27 def melodic_intervals_changing_direction melodic_intervals.each_cons(2).reject do |interval_pair| interval_pair[0].direction == interval_pair[1].direction end end
notes_per_direction()
click to toggle source
# File lib/head_music/style/guidelines/direction_changes.rb, line 23 def notes_per_direction notes.length.to_f / (melodic_intervals_changing_direction.length + 1) end
overage()
click to toggle source
# File lib/head_music/style/guidelines/direction_changes.rb, line 17 def overage return 0 if notes.length < 2 [notes_per_direction - self.class.maximum_notes_per_direction, 0].max end