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# frozen_string_literal: true
# A melodic interval is the distance between one note and the next.
class HeadMusic::MelodicInterval
attr_reader :first_note, :second_note
def initialize(note1, note2)
@first_note = note1
@second_note = note2
end
def diatonic_interval
@diatonic_interval ||= HeadMusic::DiatonicInterval.new(first_pitch, second_pitch)
end
def position_start
first_note.position
end
def position_end
second_note.next_position
end
def notes
[first_note, second_note]
end
def pitches
[first_pitch, second_pitch]
end
def first_pitch
@first_pitch ||= first_note.pitch
end
def second_pitch
@second_pitch ||= second_note.pitch
end
def to_s
[direction, diatonic_interval].join(' ')
end
def ascending?
direction == :ascending
end
def descending?
direction == :descending
end
def moving?
ascending? || descending?
end
def repetition?
!moving?
end
def spans?(pitch)
pitch >= low_pitch && pitch <= high_pitch
end
def high_pitch
pitches.max
end
def low_pitch
pitches.min
end
def direction
@direction ||=
if first_pitch < second_pitch
:ascending
elsif first_pitch > second_pitch
:descending
else
:none
end
end
def spells_consonant_triad_with?(other_interval)
return false if step? || other_interval.step?
combined_pitches = (pitches + other_interval.pitches).uniq
return false if combined_pitches.length < 3
HeadMusic::PitchSet.new(combined_pitches).consonant_triad?
end
def method_missing(method_name, *args, &block)
respond_to_missing?(method_name) ? diatonic_interval.send(method_name, *args, &block) : super
end
def respond_to_missing?(method_name, *_args)
diatonic_interval.respond_to?(method_name)
end
end
Version data entries
17 entries across 17 versions & 1 rubygems