Sha256: dc9b28275f3577d6a43fe34b6e6ca4cde0a3c6fa920557ce12b6084dc9f97a93
Contents?: true
Size: 1.51 KB
Versions: 21
Compression:
Stored size: 1.51 KB
Contents
# frozen_string_literal: true
# Module for style guidelines.
module HeadMusic::Style::Guidelines; end
# Ok, so a rule might be that after the first leap (after previous steps)
# one should normally move by step in the opposite direction
# unless another leap (in either direction) creates a consonant triad.
# - Brian
class HeadMusic::Style::Guidelines::RecoverLargeLeaps < HeadMusic::Style::Annotation
MESSAGE = 'Recover large leaps by step in the opposite direction.'
def marks
melodic_intervals.each_cons(3).map do |intervals|
if unrecovered_leap?(intervals[0], intervals[1], intervals[2])
HeadMusic::Style::Mark.for_all(notes_in_intervals(intervals))
end
end.compact
end
private
def notes_in_intervals(intervals)
(intervals[0].notes + intervals[1].notes).uniq
end
def unrecovered_leap?(first_interval, second_interval, third_interval)
first_interval.large_leap? &&
!spelling_consonant_triad?(first_interval, second_interval, third_interval) &&
(
!direction_changed?(first_interval, second_interval) ||
!second_interval.step?
)
end
def spelling_consonant_triad?(first_interval, second_interval, third_interval)
first_interval.spells_consonant_triad_with?(second_interval) ||
second_interval.spells_consonant_triad_with?(third_interval)
end
def direction_changed?(first_interval, second_interval)
first_interval.ascending? && second_interval.descending? ||
first_interval.descending? && second_interval.ascending?
end
end
Version data entries
21 entries across 21 versions & 1 rubygems