module Tracksperanto::ZipTuples
Implements the zip_curve_tuples
method
Public Instance Methods
zip_curve_tuples(*given_curves)
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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
# 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