QR-Code-generator/python/qrcodegen-demo.py

# 
# QR Code generator demo (Python 2, 3)
# 
# Copyright (c) 2016 Project Nayuki
# https://www.nayuki.io/page/qr-code-generator-library
# 
# (MIT License)
# Permission is hereby granted, free of charge, to any person obtaining a copy of
# this software and associated documentation files (the "Software"), to deal in
# the Software without restriction, including without limitation the rights to
# use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
# the Software, and to permit persons to whom the Software is furnished to do so,
# subject to the following conditions:
# - The above copyright notice and this permission notice shall be included in
#   all copies or substantial portions of the Software.
# - The Software is provided "as is", without warranty of any kind, express or
#   implied, including but not limited to the warranties of merchantability,
#   fitness for a particular purpose and noninfringement. In no event shall the
#   authors or copyright holders be liable for any claim, damages or other
#   liability, whether in an action of contract, tort or otherwise, arising from,
#   out of or in connection with the Software or the use or other dealings in the
#   Software.
# 

from __future__ import print_function
import qrcodegen


# ---- Main program ----

def main():
	"""The main application program."""
	do_basic_demo()
	do_variety_demo()
	do_segment_demo()


def do_basic_demo():
	"""Creates a single QR Code, then prints it to the console."""
	text = u"Hello, world!"               # User-supplied Unicode text
	errcorlvl = qrcodegen.QrCode.Ecc.LOW  # Error correction level
	qr = qrcodegen.encode_text(text, errcorlvl)
	print_qr(qr)


def do_variety_demo():
	"""Creates a variety of QR Codes that exercise different features of the library, and prints each one to the console."""
	
	# Project Nayuki URL
	qr = qrcodegen.encode_text("https://www.nayuki.io/", qrcodegen.QrCode.Ecc.HIGH)
	qr = qrcodegen.QrCode(qrcode=qr, mask=3)  # Change mask, forcing to mask #3
	print_qr(qr)
	
	# Numeric mode encoding (3.33 bits per digit)
	qr = qrcodegen.encode_text("314159265358979323846264338327950288419716939937510", qrcodegen.QrCode.Ecc.MEDIUM)
	print_qr(qr)
	
	# Alphanumeric mode encoding (5.5 bits per character)
	qr = qrcodegen.encode_text("DOLLAR-AMOUNT:$39.87 PERCENTAGE:100.00% OPERATIONS:+-*/", qrcodegen.QrCode.Ecc.HIGH)
	print_qr(qr)
	
	# Unicode text as UTF-8, and different masks
	qr = qrcodegen.encode_text(u"\u3053\u3093\u306B\u3061\u0077\u0061\u3001\u4E16\u754C\uFF01\u0020\u03B1\u03B2\u03B3\u03B4", qrcodegen.QrCode.Ecc.QUARTILE)
	print_qr(qrcodegen.QrCode(qrcode=qr, mask=0))
	print_qr(qrcodegen.QrCode(qrcode=qr, mask=1))
	print_qr(qrcodegen.QrCode(qrcode=qr, mask=5))
	print_qr(qrcodegen.QrCode(qrcode=qr, mask=7))
	
	# Moderately large QR Code using longer text (from Lewis Carroll's Alice in Wonderland)
	qr = qrcodegen.encode_text("Alice was beginning to get very tired of sitting by her sister on the bank, "
		"and of having nothing to do: once or twice she had peeped into the book her sister was reading, "
		"but it had no pictures or conversations in it, 'and what is the use of a book,' thought Alice "
		"'without pictures or conversations?' So she was considering in her own mind (as well as she could, "
		"for the hot day made her feel very sleepy and stupid), whether the pleasure of making a "
		"daisy-chain would be worth the trouble of getting up and picking the daisies, when suddenly "
		"a White Rabbit with pink eyes ran close by her.", qrcodegen.QrCode.Ecc.HIGH)
	print_qr(qr)


def do_segment_demo():
	"""Creates QR Codes with manually specified segments for better compactness."""
	
	# Illustration "silver"
	silver0 = "THE SQUARE ROOT OF 2 IS 1."
	silver1 = "41421356237309504880168872420969807856967187537694807317667973799"
	qr = qrcodegen.encode_text(silver0 + silver1, qrcodegen.QrCode.Ecc.LOW)
	print_qr(qr)
	
	segs = [
		qrcodegen.QrSegment.make_alphanumeric(silver0),
		qrcodegen.QrSegment.make_numeric(silver1)]
	qr = qrcodegen.encode_segments(segs, qrcodegen.QrCode.Ecc.LOW)
	print_qr(qr)
	
	# Illustration "golden"
	golden0 = u"Golden ratio \u03C6 = 1."
	golden1 = u"6180339887498948482045868343656381177203091798057628621354486227052604628189024497072072041893911374"
	golden2 = u"......"
	qr = qrcodegen.encode_text(golden0 + golden1 + golden2, qrcodegen.QrCode.Ecc.LOW)
	print_qr(qr)
	
	segs = [
		qrcodegen.QrSegment.make_bytes(golden0.encode("UTF-8")),
		qrcodegen.QrSegment.make_numeric(golden1),
		qrcodegen.QrSegment.make_alphanumeric(golden2)]
	qr = qrcodegen.encode_segments(segs, qrcodegen.QrCode.Ecc.LOW)
	print_qr(qr)



# ---- Utilities ----

def print_qr(qrcode):	
	"""Prints the given QrCode object to the console."""
	border = 4
	for y in range(-border, qrcode.get_size() + border):
		for x in range(-border, qrcode.get_size() + border):
			print(u"\u2588 "[qrcode.get_module(x,y)] * 2, end="")
		print()
	print()


# Run the main program
if __name__ == "__main__":
	main()