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module Mext
#
# +Mext::PitchClassArray+
#
# a kind of +Mext::EndlessArray+ which
# has a secondary +Mext::EndlessArray+ of the interval
# relations among
# or the previous value in an endless fashion (i.e. +mod'ding+
# the current index)
#
class PitchClassArray < EndlessArray
attr_reader :intervals
#
# +Mext::PitchClassArray.new(me = [], rv = 0)+
#
# create an endless array which is supposed to
# be filled up with pitch classes
#
def initialize(me = [], rv = 0)
super
condition_pitches!
@intervals = create_interval_array
end
private
#
# +condition_pitches!+ transform all numbers in pitch classes
# for further processing. We check that n is not nil to manage
# rests and so on.
#
def condition_pitches!
self.each_index do
|idx|
if self[idx]
tmp = Mext::Music::PitchClass.new(self[idx].to_f)
self[idx] = tmp
end
end
end
#
# the interval array is an array of semitones (not pitch classes)
#
def create_interval_array
res = EndlessArray.new
last_pch = self.first
unless self.empty?
self[1..-1].each do
|pch|
intv = last_pch && pch ? (pch - last_pch).to_semitones : nil
res << intv
last_pch = pch
end
end
res
end
end
end
Version data entries
10 entries across 10 versions & 1 rubygems