Class: Xi::Bjorklund

Inherits:
Object show all
Defined in:
lib/xi/bjorklund.rb

Overview

Implementation adapted from Nebs’ (MIT licensed) github.com/nebs/bjorklund-euclidean-rhythms

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(pulses, slots, value = nil) ⇒ Bjorklund 



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# File 'lib/xi/bjorklund.rb', line 7

def initialize(pulses, slots, value=nil)
  @pulses = pulses.to_i
  @slots = slots.to_i
  @value = value || 1
end

Instance Attribute Details

#pulses ⇒ Object (readonly)

Returns the value of attribute pulses.



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# File 'lib/xi/bjorklund.rb', line 5

def pulses
  @pulses
end

#slots ⇒ Object (readonly)

Returns the value of attribute slots.



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# File 'lib/xi/bjorklund.rb', line 5

def slots
  @slots
end

#value ⇒ Object (readonly)

Returns the value of attribute value.



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# File 'lib/xi/bjorklund.rb', line 5

def value
  @value
end

Instance Method Details

#inspect ⇒ Object 



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# File 'lib/xi/bjorklund.rb', line 18

def inspect
  "e(#{@pulses}, #{@slots}, #{@value.inspect})"
end

#p(*args, **metadata) ⇒ Object 



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# File 'lib/xi/bjorklund.rb', line 13

def p(*args, **metadata)
  ary = to_a
  ary.map { |v| v ? @value : nil }.p(1 / ary.size, **metadata)
end

#to_a ⇒ Object 



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# File 'lib/xi/bjorklund.rb', line 26

def to_a
  k = @pulses
  n = @slots

  return [] if n == 0 || k == 0

  bins = []
  remainders = []
  k.times { |i| bins[i] = [true] }
  (n-k).times { |i| remainders[i] = [false] }

  return bins.flatten if n == k

  loop do
    new_remainders = []
    bins.each_with_index do |bin, i|
      if remainders.empty?
        new_remainders.push bin
      else
        bin += remainders.shift
        bins[i] = bin
      end
    end

    if new_remainders.any?
      bins.pop new_remainders.count
      remainders = new_remainders
    end

    break unless remainders.size > 1
  end

  return (bins + remainders).flatten
end

#to_s ⇒ Object 



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# File 'lib/xi/bjorklund.rb', line 22

def to_s
  to_a.map { |i| i ? 'x' : '.' }.join
end