Class: Barcodes::Symbology::Interleaved2Of5Mod10

Inherits:
Interleaved2Of5 show all
Defined in:
lib/barcodes/symbology/interleaved2of5mod10.rb

Overview

This class represents the Interleaved 2 of 5 Mod 10 symbology Interleaved 2 of 5 Mod 10 can encode only numbers 0-9

More info: en.wikipedia.org/wiki/Interleaved_2_of_5

Instance Attribute Summary

Attributes inherited from Base

#alpha, #bar_height, #bar_width, #caption_height, #caption_size, #captioned, #color, #data

Instance Method Summary collapse

Methods inherited from Interleaved2Of5

charset, #initialize, valueset

Methods inherited from Base

#caption_data, charset, #encoded_data, #height, #initialize, #quiet_zone_width, #valid?, valueset, #width

Constructor Details

This class inherits a constructor from Barcodes::Symbology::Interleaved2Of5

Instance Method Details

#checksum ⇒ Object

Calculates the checksum using provided data



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# File 'lib/barcodes/symbology/interleaved2of5mod10.rb', line 27

def checksum
  even_sum = 0
  odd_sum = 0
  index = 0
  @data.reverse.each_char do |char|
    if ('0'..'9').include? char
      if index.even?
        even_sum += char.to_i * 3
      else
        odd_sum += char.to_i
      end
    end
    index += 1
  end
  sum = even_sum + odd_sum
  
  value = 10 - (sum % 10)
  if value == 10
    value = 0
  end
  
  if (0..9).include? value
    return value.to_s
  end
end

#formatted_data ⇒ Object

Returns start character + data + checksum + stop character



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# File 'lib/barcodes/symbology/interleaved2of5mod10.rb', line 19

def formatted_data
  checksum = self.checksum
  unless checksum.nil?
    @start_character + @data + checksum + @stop_character
  end
end