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Contents
module HeadMusic::Style::Annotations
end
class HeadMusic::Style::Annotations::DirectionChanges < HeadMusic::Style::Annotation
MAXIMUM_NOTES_PER_DIRECTION = 3
MESSAGE = "Balance ascending and descending motion."
def marks
if overage > 0
penalty_exponent = overage**0.5
HeadMusic::Style::Mark.for_all(notes, fitness: HeadMusic::PENALTY_FACTOR**penalty_exponent)
end
end
private
def overage
return 0 if notes.length < 2
[notes_per_direction - MAXIMUM_NOTES_PER_DIRECTION, 0].max
end
def notes_per_direction
notes.length.to_f / (melodic_intervals_changing_direction.length + 1)
end
def melodic_intervals_changing_direction
melodic_intervals.drop(1).select.with_index do |interval, i|
previous_direction = melodic_intervals[i].direction
interval.direction != previous_direction
end
end
end
Version data entries
7 entries across 7 versions & 1 rubygems