40 lines
1.2 KiB
Ruby
40 lines
1.2 KiB
Ruby
module RQRCode
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module SizeCalculator
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# size - seems to follow this logic
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# # | input | modules
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# | size | created
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#-------|-------|--------
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# 1 | 7 | 21
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# 2 | 14 | 25 (+4)
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# 3 | 24 | 29 -
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# 4 | 34 | 33 -
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# 5 | 44 | 37 -
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# 6 | 58 | 41 -
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# 7 | 64 | 45 -
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# 8 | 84 | 49 -
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# 9 | 98 | 53 -
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# 10 | 119 | 57 -
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# 11 | 137 | 61 -
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# 12 | 155 | 65 -
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# 13 | 177 | 69 -
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# 14 | 194 | 73 -
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QR_CHAR_SIZE_VS_SIZE = [7, 14, 24, 34, 44, 58, 64, 84, 98, 119, 137, 155, 177, 194]
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def minimum_qr_size_from_string(string)
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QR_CHAR_SIZE_VS_SIZE.each_with_index do |size, index|
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return (index + 1) if string.size < size
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end
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# If it's particularly big, we'll try and create codes until it accepts
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i = QR_CHAR_SIZE_VS_SIZE.size
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begin
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i += 1
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RQRCode::QRCode.new(string, :size => i)
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return i
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rescue RQRCode::QRCodeRunTimeError
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retry
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end
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end
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end
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end |