Class: RqrcodeRenderer::SizeCalculator

Inherits:
Object
  • Object
show all
Defined in:
lib/rqrcode_renderer/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].freeze

Class Method Summary collapse

Class Method Details

.minimum_qr_size_from_string(string) ⇒ Object 



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# File 'lib/rqrcode_renderer/size_calculator.rb', line 27

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
    RQRCode::QRCode.new(string, size: i)
    i
  rescue RQRCode::QRCodeRunTimeError
    retry
  end
end