def get_coordinates(symbol_version):
"""Given a symbol version number returns a list of alignment patterns
center coordinates."""
centers = get_centers(symbol_version)
coordinates = [x for x in product(centers, centers)]
coordinates = [x for x in coordinates if is_valid(x,
qr_size(symbol_version))]
return coordinates
def get_coordinates(symbol_version):
"""Given a symbol version number returns a list of alignment patterns
center coordinates."""
centers = get_centers(symbol_version)
coordinates = [x for x in product(centers, centers)]
coordinates = [
x for x in coordinates if is_valid(x, qr_size(symbol_version))
]
return coordinates
def place_data(code, symbol_array):
"""An alternative method for placement in the symbol, which yields the
same result, is to regard the interleaved codeword sequence as a single
bit stream, which is placed (starting with the most significant bit) in
the two-module wide columns alternately upwards and downwards from the
right to left of the symbol. In each column the bits are placed
alternately in the right and left modules, moving upwards or downwards
according to the direction of placement and skipping areas occupied by
function patterns, changing direction at the top or bottom of the column.
Each bit shall always be placed in the first available module position.
"""
# Rotate the array 180 degrees so that data positioning start from
# symbol_array[0][0]
symbol_array = rot90(symbol_array, 2)
flat_data_list = list("".join(list_to_bin(code.final_sequence))) + ([0] *
symbol_version_data[code.symbol_version]['remainder_bits'])
top = 0
bottom = qr_size(code.symbol_version) - 1
direction = 1
left_column = 0
row = 0
column = 0
while flat_data_list:
# If we have reached top or bottom margins
if direction == 1:
if row > bottom:
# reset row to bottom index
row = bottom
# shift by 2 columns
left_column += 2
column = left_column
# invert direction
direction *= -1
else:
if row < top:
# reset row to top index
row = top
left_column += 2
column = left_column
direction *= -1
try:
if symbol_array[row][column] == 9:
data = flat_data_list.pop(0)
symbol_array[row][column] = data
except IndexError:
pass
if column % 2 == 0:
column += 1
else:
column = left_column
row += 1 * direction
# rotate back the symbol
return rot90(symbol_array, 2)
def place_data(code, symbol_array):
"""An alternative method for placement in the symbol, which yields the
same result, is to regard the interleaved codeword sequence as a single
bit stream, which is placed (starting with the most significant bit) in
the two-module wide columns alternately upwards and downwards from the
right to left of the symbol. In each column the bits are placed
alternately in the right and left modules, moving upwards or downwards
according to the direction of placement and skipping areas occupied by
function patterns, changing direction at the top or bottom of the column.
Each bit shall always be placed in the first available module position.
"""
# Rotate the array 180 degrees so that data positioning start from
# symbol_array[0][0]
symbol_array = rot90(symbol_array, 2)
flat_data_list = list("".join(list_to_bin(code.final_sequence))) + (
[0] * symbol_version_data[code.symbol_version]['remainder_bits'])
top = 0
bottom = qr_size(code.symbol_version) - 1
direction = 1
left_column = 0
row = 0
column = 0
while flat_data_list:
# If we have reached top or bottom margins
if direction == 1:
if row > bottom:
# reset row to bottom index
row = bottom
# shift by 2 columns
left_column += 2
column = left_column
# invert direction
direction *= -1
else:
if row < top:
# reset row to top index
row = top
left_column += 2
column = left_column
direction *= -1
try:
if symbol_array[row][column] == 9:
data = flat_data_list.pop(0)
symbol_array[row][column] = data
except IndexError:
pass
if column % 2 == 0:
column += 1
else:
column = left_column
row += 1 * direction
# rotate back the symbol
return rot90(symbol_array, 2)
def position_detection_pattern(symbol_version):
"""Assign Position Detection Pattern bits and relative separators."""
side_size = qr_size(symbol_version)
arr = array([[9] * side_size] * side_size)
arr[0] = arr[6] = [7] * 7 + [6] + [9] * (side_size - 16) + [6] + [7] * 7
arr[1] = arr[5] = ([7, 6, 6, 6, 6, 6, 7, 6] + [9] * (side_size - 16) +
[6, 7, 6, 6, 6, 6, 6, 7])
arr[2] = arr[3] = arr[4] = ([7, 6, 7, 7, 7, 6, 7, 6] + [9] *
(side_size - 16) + [6, 7, 6, 7, 7, 7, 6, 7])
arr[7] = [6] * 8 + [9] * (side_size - 16) + [6] * 8
arr[-8] = [6] * 8 + [9] * (side_size - 8)
arr[-1] = arr[-7] = [7] * 7 + [6] + [9] * (side_size - 8)
arr[-2] = arr[-6] = [7, 6, 6, 6, 6, 6, 7, 6] + [9] * (side_size - 8)
arr[-3] = arr[-4] = arr[-5] = ([7, 6, 7, 7, 7, 6, 7, 6] + [9] *
(side_size - 8))
return arr
def position_detection_pattern(symbol_version):
"""Assign Position Detection Pattern bits and relative separators."""
side_size = qr_size(symbol_version)
arr = array([[9] * side_size] * side_size)
arr[0] = arr[6] = [7] * 7 + [6] + [9] * (side_size - 16) + [6] + [7] * 7
arr[1] = arr[5] = ([7, 6, 6, 6, 6, 6, 7, 6] +
[9] * (side_size - 16) +
[6, 7, 6, 6, 6, 6, 6, 7])
arr[2] = arr[3] = arr[4] = ([7, 6, 7, 7, 7, 6, 7, 6] +
[9] * (side_size - 16) +
[6, 7, 6, 7, 7, 7, 6, 7])
arr[7] = [6] * 8 + [9] * (side_size - 16) + [6] * 8
arr[-8] = [6] * 8 + [9] * (side_size - 8)
arr[-1] = arr[-7] = [7] * 7 + [6] + [9] * (side_size - 8)
arr[-2] = arr[-6] = [7, 6, 6, 6, 6, 6, 7, 6] + [9] * (side_size - 8)
arr[-3] = arr[-4] = arr[-5] = ([7, 6, 7, 7, 7, 6, 7, 6] +
[9] * (side_size - 8))
return arr