Module: Tracksperanto::ZipTuples

Included in:
Import::Base, Import::NukeScript::Tracker3, Import::ShakeScript::TrackExtractor
Defined in:
lib/tracksperanto/zip_tuples.rb

Overview

Implements the zip_curve_tuples method

Instance Method Summary collapse

Instance Method Details

#zip_curve_tuples(*given_curves) ⇒ Object

Zip arrays of “value at” tuples into an array of “values at” tuples (note the plural). The first value of each tuple will be the frame number and keyframes which are not present in all arrays will be discarded. For example:

zip_curve_tuples( [[0, 12], [1, 23]], [[1, 12]]) #=> [[1, 23, 12]]

We make use of the fact that setting an offset index in an array fills it with nils up to the index inserted


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# File 'lib/tracksperanto/zip_tuples.rb', line 12

def zip_curve_tuples(*given_curves)
  tuples = {}
  given_curves.each_with_index do | curve, curve_i |
    curve.each do | frame_value_tuple |
      frame, value = frame_value_tuple
      tuples[frame] ||= Array.new(given_curves.length)
      tuples[frame][curve_i] = value
    end
  end
  
  tuples.delete_if {|k,v| v.include?(nil) } # If any of the positions is nil
  
  tuples.keys.sort.map do | frame_in_order |
    [frame_in_order] + tuples[frame_in_order]
  end
end