You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: units.rb
    path of file: ./repos/rmagick/lib/rvg
    
    the code of the file until where you have to start completion: # $Id: units.rb,v 1.5 2009/02/28 23:52:28 rmagick Exp $
# Copyright (C) 2009 Timothy P. Hunter
module Magick
  class RVG
    # Define RVG.dpi and RVG.dpi=. Add conversions to Integer and Float classes
    class << self
      attr_reader :dpi
      def dpi=(n)
        unless defined?(@dpi)
          [Float, Integer].each do |c|
            c.class_eval <<-END_DEFS, __FILE__, __LINE__ + 1
              # the default measurement - 1px is 1 pixel
              def px
                self
              end
              # inches
              def in
                self * ::Magick::RVG.dpi
              end
              # millimeters
    
    
      def dpi=(n)
        unless defined?(@dpi)
          [Float, Integer].each do |c|
            c.class_eval <<-END_DEFS, __FILE__, __LINE__ + 1
              # the default measurement - 1px is 1 pixel
              def px
                self
              end
              # inches
              def in
                self * ::Magick::RVG.dpi
              end
              # millimeters
              def mm
                self * ::Magick::RVG.dpi / 25.4
              end
              # centimeters
              def cm
                self * ::Magick::RVG.dpi / 2.54
              end
              # points
              def pt
                self * ::Magick::RVG.dpi / 72.0
              end
              # picas
              def pc
                self * ::Magick::RVG.dpi / 6.0
              end
              # percentage of the argument
              def pct(of)
                self * Float(of) / 100.0
              end
              # the default is deg
              def deg
                self
              end
              # radians -> degrees
              def rad
                self * 180.0 / Math::PI
              end
              # grads -> degrees
              def grad
                self * 9.0 / 10.0
              end
            END_DEFS
          end
        end