Class: Musicality::NoteSequenceExtractor

Inherits:
Object
  • Object
show all
Defined in:
lib/musicality/performance/conversion/note_sequence_extractor.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(notes) ⇒ NoteSequenceExtractor

Returns a new instance of NoteSequenceExtractor.



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# File 'lib/musicality/performance/conversion/note_sequence_extractor.rb', line 5

def initialize notes
  @notes = notes.map {|n| n.clone }
  mark_slurring
  remove_bad_links
  calculate_offsets
  establish_maps
  # now, ready to extract sequences!
end

Instance Attribute Details

#notes ⇒ Object (readonly)

Returns the value of attribute notes.



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# File 'lib/musicality/performance/conversion/note_sequence_extractor.rb', line 4

def notes
  @notes
end

Instance Method Details

#extract_sequences(cents_per_step = 10) ⇒ Object 



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# File 'lib/musicality/performance/conversion/note_sequence_extractor.rb', line 14

def extract_sequences cents_per_step = 10
  return [] if @notes.empty?
  
  next_seqs = seqs_from_note(@notes.size-1, cents_per_step)
  return next_seqs if @notes.one?
  
  complete_seqs = []
  (@notes.size-2).downto(0) do |i|
    cur_seqs = seqs_from_note(i, cents_per_step)
    map = @maps[i]
    
    next_seqs.each do |next_seq|
      p1 = nil
      p2 = next_seq.elements.first.pitch
      if p1 = map[:ties].key(p2)
        cur_seq = cur_seqs.find {|x| x.elements.first.pitch == p1 }
        NoteSequenceExtractor.tie_seqs(cur_seq, next_seq)
      elsif p1 = map[:slurs].key(p2)
        cur_seq = cur_seqs.find {|x| x.elements.first.pitch == p1 }
        NoteSequenceExtractor.slur_seqs(cur_seq, next_seq)
      elsif p1 = map[:full_glissandos].key(p2)
        cur_seq = cur_seqs.find {|x| x.elements.first.pitch == p1 }
        NoteSequenceExtractor.glissando_seqs(cur_seq, next_seq)
      elsif p1 = map[:full_portamentos].key(p2)
        cur_seq = cur_seqs.find {|x| x.elements.first.pitch == p1 }
        NoteSequenceExtractor.portamento_seqs(cur_seq, next_seq, cents_per_step)
      else
        complete_seqs.push next_seq
      end
    end      
    next_seqs = cur_seqs
  end
  complete_seqs += next_seqs
  return complete_seqs
end