Class: Barcodes::Symbology::Ean8

Inherits:
Ean
  • Object
show all
Defined in:
lib/barcodes/symbology/ean8.rb

Overview

This class represents the EAN8 symbology EAN8 can encode only numbers 0-9

More info: en.wikipedia.org/wiki/International_Article_Number_(EAN)

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 Ean

#caption_data, charset, #checksum, left_hand_even, left_hand_odd, parity, #quiet_zone_width, right_hand, valueset

Methods inherited from Base

#caption_data, charset, #height, #quiet_zone_width, valueset, #width

Constructor Details

#initialize(args = {}) ⇒ Ean8

Creates a new Ean13 instance



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# File 'lib/barcodes/symbology/ean8.rb', line 19

def initialize(args={})
  unless args.has_key? :data
    args[:data] = '0123456'
  end
  
  super(args)
end

Instance Method Details

#encoded_data ⇒ Object

Encodes data into 1’s and 0’s



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# File 'lib/barcodes/symbology/ean8.rb', line 33

def encoded_data
  if self.valid?
    formatted_data = self.formatted_data
    encoded_data = ""
    index = 0
    formatted_data.each_byte do |char|
      if char.chr == 'S'
        encoded_data += "101"
      elsif char.chr == 'C'
        encoded_data += "01010"
      else
        if index < 6
          encoded_data += self._encode_character_with_parity(char, '1')
        else
          encoded_data += self._encode_character_with_right_hand(char)
        end
      end
      index += 1
    end
    encoded_data
  end
end

#formatted_data ⇒ Object

Returns start character + data + center character + data + checksum + stop character



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# File 'lib/barcodes/symbology/ean8.rb', line 28

def formatted_data
  @start_character + @data[0..3] + @center_character + @data[4..6] + self.checksum + @stop_character
end

#valid? ⇒ Boolean

Determines whether or not the barcode data to be encoded is valid. Data length must be exactly 7 digits

Returns:

  • (Boolean) 


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# File 'lib/barcodes/symbology/ean8.rb', line 59

def valid?
  return self.data.length == 7 ? true : false
end