g81_relative.rb

# -*- encoding : utf-8 -*-
#
#          DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
#                  Version 2, December 2004
#
#  Copyright (C) 2004 Sam Hocevar
#  14 rue de Plaisance, 75014 Paris, France
#  Everyone is permitted to copy and distribute verbatim or modified
#  copies of this license document, and changing it is allowed as long
#  as the name is changed.
#  DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
#  TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
#  0. You just DO WHAT THE FUCK YOU WANT TO.
#
#
#  David Hagege <david.hagege@gmail.com>

class G81Relative
  def self.convert_distance_to_fractional_turns(distance)
    screw_pitch = 0.5
    rat = Rational(distance / screw_pitch).round(1)
    rat = rat == 0 / 1 ? 0 : rat
    "#{rat.abs}#{rat > 0 ? "CW" : "CCW"}"
  end

  def self.convert_distance_to_degrees(distance)
    screw_pitch = 0.5
    deg = (distance / screw_pitch * 360).round
    "#{deg.abs}°#{deg > 0 ? "CW" : "CCW"}"
  end

  def self.nb_fmt(nb)
    "%.2f" % nb
  end

  def self.g81_relative(content)
    points = content.scan(/-?\d.\d+/).map(&:to_f)

    center = points[24]
    top_left, top_middle, top_right, middle_left,
    middle_right, bottom_left,
    bottom_center, bottom_right = points.values_at(0, 3, 6, 21, 27, 42, 45, 48).map { |x| (x - center).round(2) }

    %Q{
      Raw values:
      #{nb_fmt(top_left)}\t#{nb_fmt(top_middle)}\t#{nb_fmt(top_right)}
      #{nb_fmt(middle_left)}\t0.00\t#{nb_fmt(middle_right)}
      #{nb_fmt(bottom_left)}\t#{nb_fmt(bottom_center)}\t#{nb_fmt(bottom_right)}
      
      Degrees:
      #{convert_distance_to_degrees(top_left)}\t#{convert_distance_to_degrees(top_middle)}\t#{convert_distance_to_degrees(top_right)}
      #{convert_distance_to_degrees(middle_left)}\t0\t#{convert_distance_to_degrees(middle_right)}
      #{convert_distance_to_degrees(bottom_left)}\t#{convert_distance_to_degrees(bottom_center)}\t#{convert_distance_to_degrees(bottom_right)}

      Fractional Turns:
      #{convert_distance_to_fractional_turns(top_left)}\t#{convert_distance_to_fractional_turns(top_middle)}\t#{convert_distance_to_fractional_turns(top_right)}
      #{convert_distance_to_fractional_turns(middle_left)}\t0\t#{convert_distance_to_fractional_turns(middle_right)}
      #{convert_distance_to_fractional_turns(bottom_left)}\t#{convert_distance_to_fractional_turns(bottom_center)}\t#{convert_distance_to_fractional_turns(bottom_right)}
    }
  end
end