Class: Barcodes::Symbology::MsiMod10

Inherits:
Msi
  • Object
show all
Defined in:
lib/barcodes/symbology/msimod10.rb

Overview

This class represents the MSI Mod 10 symbology MSI Mod 10 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



27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
 
# File 'lib/barcodes/symbology/msimod10.rb', line 27

def checksum
  if self.valid?
    used_nums = []
    unused_nums = []
    index = 0
    data.reverse.each_char do |char|
      if index.even?
        used_nums << char.to_i
      else
        unused_nums << char.to_i
      end
      index += 1
    end
    used_nums.reverse!
    unused_nums.reverse!
    
    sum = 0
    (used_nums.join.to_i * 2).to_s.split(//).each do |n|
      sum += n.to_i
    end
    unused_nums.each do |n|
      sum += n
    end
  
    value = 10 - (sum % 10)
    
    if value == 10
      value = 0
    end
  
    if (0..9).include? value
      return value.to_s
    end
  end
end

#formatted_data ⇒ Object

Returns start character + data + checksum + stop character



19
20
21
22
23
24
 
# File 'lib/barcodes/symbology/msimod10.rb', line 19

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