Class: Barcodes::Symbology::MsiMod11

Inherits:
Msi
  • Object
show all
Defined in:
lib/barcodes/symbology/msimod11.rb

Overview

This class represents the MSI Mod 11 symbology MSI Mod 11 can encode only numbers 0-9

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

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 Msi

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::Msi

Instance Method Details

#checksum ⇒ Object

Calculates the checksum using the provided data



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# File 'lib/barcodes/symbology/msimod11.rb', line 27

def checksum
  if self.valid?
    sum = 0
    weight = 2
    data.reverse.each_char do |char|
      if ('0'..'9').include? char
        sum += weight * char.to_i
      end
      if weight < 7
        weight += 1
      else
        weight = 2
      end
    end

    value = sum % 11

    if (0..9).include? value
      return value.to_s
    end
  end
end

#formatted_data ⇒ Object

Returns start character + data + checksum + stop character



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# File 'lib/barcodes/symbology/msimod11.rb', line 19

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