class Coltrane::Theory::IntervalSequence
It describes a sequence of intervals
Attributes
intervals[R]
Public Class Methods
new(*intervals, notes: nil, relative_intervals: nil)
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# File lib/coltrane/theory/interval_sequence.rb, line 13 def initialize(*intervals, notes: nil, relative_intervals: nil) if intervals.any? @intervals = if intervals.first.is_a?(Interval) intervals else intervals.map { |i| Interval[i] } end elsif notes notes = NoteSet[*notes] if notes.is_a?(Array) @intervals = intervals_from_notes(notes) elsif relative_intervals @relative_intervals = relative_intervals @intervals = intervals_from_relative_intervals(relative_intervals) else raise WrongKeywordsError, 'Provide: [notes:] || [intervals:] || [relative_intervals:]' end end
Public Instance Methods
&(other)
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# File lib/coltrane/theory/interval_sequence.rb, line 137 def &(other) case other when Array then intervals & other when IntervalSequence then intervals & other.semitones end end
[](x)
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# File lib/coltrane/theory/interval_sequence.rb, line 87 def [](x) intervals[x] end
all()
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# File lib/coltrane/theory/interval_sequence.rb, line 83 def all intervals end
find(interval)
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# File lib/coltrane/theory/interval_sequence.rb, line 65 def find(interval) interval.clone if detect { |i| interval == i } end
find_by_distance(n, accept_altered = true)
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# File lib/coltrane/theory/interval_sequence.rb, line 73 def find_by_distance(n, accept_altered = true) strategy = (accept_altered ? :as : :as!) map { |interval| interval.send(strategy, n) } .compact .sort_by { |i| i.alteration.abs } .first end
full_names()
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# File lib/coltrane/theory/interval_sequence.rb, line 125 def full_names map(&:full_name) end
has?(interval)
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# File lib/coltrane/theory/interval_sequence.rb, line 69 def has?(interval) !!find(interval) end
intervals_semitones()
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# File lib/coltrane/theory/interval_sequence.rb, line 117 def intervals_semitones map(&:semitones) end
inversion(index)
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# File lib/coltrane/theory/interval_sequence.rb, line 101 def inversion(index) self.class.new(*intervals.rotate(index)).zero_it end
inversions()
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# File lib/coltrane/theory/interval_sequence.rb, line 113 def inversions Array.new(intervals.length) { |i| inversion(i) } end
names()
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# File lib/coltrane/theory/interval_sequence.rb, line 61 def names intervals.map(&:name) end
Also aliased as: interval_names
next_inversion()
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# File lib/coltrane/theory/interval_sequence.rb, line 105 def next_inversion inversion(index + 1) end
notes_for(root_note)
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# File lib/coltrane/theory/interval_sequence.rb, line 129 def notes_for(root_note) NoteSet[ *intervals.reduce([]) do |memo, interval| memo + [root_note + interval] end ] end
previous_inversion()
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# File lib/coltrane/theory/interval_sequence.rb, line 109 def previous_inversion inversion(index - 1) end
relative_intervals()
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# File lib/coltrane/theory/interval_sequence.rb, line 51 def relative_intervals intervals_semitones[1..-1].each_with_index.map do |n, i| if i.zero? n elsif i < intervals_semitones.size n - intervals_semitones[i] end end + [12 - intervals_semitones.last] end
shift(ammount)
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# File lib/coltrane/theory/interval_sequence.rb, line 91 def shift(ammount) self.class.new(*intervals.map do |i| (i.semitones + ammount) % 12 end) end
zero_it()
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# File lib/coltrane/theory/interval_sequence.rb, line 97 def zero_it shift(-intervals.first.semitones) end
Private Instance Methods
intervals_from_notes(notes)
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# File lib/coltrane/theory/interval_sequence.rb, line 152 def intervals_from_notes(notes) notes.map { |n| notes.root - n }.sort_by(&:semitones) end
intervals_from_relative_intervals(relative_intervals)
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# File lib/coltrane/theory/interval_sequence.rb, line 146 def intervals_from_relative_intervals(relative_intervals) relative_intervals[0..-2].reduce([Interval[0]]) do |memo, d| memo + [memo.last + d] end end