Module: QRCoder::SizeCalculator

Included in:
QRCoder
Defined in:
lib/qrcoder/size_calculator.rb

Constant Summary collapse

QR_CHAR_SIZE_VS_SIZE =

size - seems to follow this logic

# | input | modules 
  | size  | created

——-|——-|——–

 1 |     7 |      21
 2 |    14 |      25 (+4)
 3 |    24 |      29   -
 4 |    34 |      33   -
 5 |    44 |      37   -
 6 |    58 |      41   -
 7 |    64 |      45   -
 8 |    84 |      49   -
 9 |    98 |      53   -
10 |   119 |      57   -
11 |   137 |      61   -
12 |   155 |      65   -
13 |   177 |      69   -
14 |   194 |      73   -

[7, 14, 24, 34, 44, 58, 64, 84, 98, 119, 137, 155, 177, 194]

Instance Method Summary collapse

Instance Method Details

#minimum_qr_size_from_string(string) ⇒ Object 



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# File 'lib/qrcoder/size_calculator.rb', line 24

def minimum_qr_size_from_string(string)
  QR_CHAR_SIZE_VS_SIZE.each_with_index do |size, index|
    return (index + 1) if string.size < size
  end
  
  # If it's particularly big, we'll try and create codes until it accepts
  i = QR_CHAR_SIZE_VS_SIZE.size
  begin
    i += 1
    QRCoder::QRCode.new(string, :size => i)
    return i
  rescue QRCoder::QRCodeRunTimeError
    retry
  end
end