Native crystal lang QR code, no external dependencies
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Add the dependency to your
shard.yml:dependencies: qr-code: github: spider-gazelle/qr-code
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Run
shards install
require "qr-code"
qr = QRCode.new("my string to generate", size: 4, level: :h)
puts qr.to_s
output
xxxxxxx x x x x x xx xxxxxxx
x x xxx xxxxxx xxx x x
x xxx x xxxxx x xx x xxx x
... etc
require "qr-code"
qr = QRCode.new("my string to generate", size: 4, level: :h)
qr.modules.each do |row|
row.each do |col|
print col ? '#' : ' '
end
print "\n"
endrequire "qr-code"
svg_string = QRCode.new("my string to generate").as_svgyou'll need to add stumpy_png to your shard.yml dependencies
require "qr-code"
require "qr-code/export/png"
# size == width, and QR codes are square
png_bytes = QRCode.new("my string to generate").as_png(size: 256)Based off the ruby gem: https://github.com/whomwah/rqrcode_core Which was adapted from the javascript library: https://github.com/kazuhikoarase/qrcode-generator