pixelcanvas/pixelcanvas.py

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import argparse
import datetime
import gzip
import logging
import PIL.Image
import random
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import requests
import sqlite3
import sys
import time
from voussoirkit import threadpool
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logging.basicConfig(level=logging.DEBUG)
log = logging.getLogger(__name__)
log.setLevel(logging.DEBUG)
logging.getLogger('urllib3.connectionpool').setLevel(logging.CRITICAL)
WHITE = (255, 255, 255)
LIGHTGRAY = (228, 228, 228)
DARKGRAY = (136, 136, 136)
BLACK = (34, 34, 34)
PINK = (255, 167, 209)
RED = (229, 0, 0)
ORANGE = (229, 149, 0)
BROWN = (160, 106, 66)
YELLOW = (229, 217, 0)
LIGHTGREEN = (148, 224, 68)
DARKGREEN = (2, 190, 1)
LIGHTBLUE = (0, 211, 221)
MEDIUMBLUE = (0, 131, 199)
DARKBLUE = (0, 0, 234)
LIGHTPURPLE = (207, 110, 228)
DARKPURPLE = (130, 0, 128)
COLOR_MAP = {
0: WHITE,
1: LIGHTGRAY,
2: DARKGRAY,
3: BLACK,
4: PINK,
5: RED,
6: ORANGE,
7: BROWN,
8: YELLOW,
9: LIGHTGREEN,
10: DARKGREEN,
11: LIGHTBLUE,
12: MEDIUMBLUE,
13: DARKBLUE,
14: LIGHTPURPLE,
15: DARKPURPLE,
}
# The width and height of a chunk, in pixels.
CHUNK_SIZE_PIX = 64
# The number of bytes for a full chunk.
# They are 32x64 because each byte represents two 4-bit pixels.
CHUNK_SIZE_BYTES = int(CHUNK_SIZE_PIX * (CHUNK_SIZE_PIX / 2))
# The width and height of a bigchunk, in chunks.
BIGCHUNK_SIZE_CHUNKS = 15
# The width and height of a bigchunk, in pixels.
BIGCHUNK_SIZE_PIX = BIGCHUNK_SIZE_CHUNKS * CHUNK_SIZE_PIX
# The number of bytes for a full bigchunk.
BIGCHUNK_SIZE_BYTES = int(BIGCHUNK_SIZE_PIX * (BIGCHUNK_SIZE_PIX / 2))
# The chunk 0, 0 has a pixel coordinate of -448, -448 for some reason.
ORIGIN_OFFSET_X = 448
ORIGIN_OFFSET_Y = 448
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DB_INIT = '''
BEGIN;
CREATE TABLE IF NOT EXISTS chunks (x INT, y INT, data BLOB, updated_at REAL);
CREATE INDEX IF NOT EXISTS chunks_x_y ON chunks(x, y);
COMMIT;
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'''
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sql = sqlite3.connect('pixelcanvas.db')
cur = sql.cursor()
cur.executescript(DB_INIT)
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# HELPER FUNCTIONS
################################################################################
def now():
n = datetime.datetime.now(datetime.timezone.utc)
return n.timestamp()
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# DB FUNCTIONS
################################################################################
def get_chunk_from_db(chunk_x, chunk_y, as_of=None):
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'''
Get the chunk from the database, and raise IndexError if it doesn't exist.
'''
query = f'''
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SELECT x, y, data FROM chunks
WHERE x == ? AND y == ?
{'AND updated_at <= ?' if as_of is not None else ''}
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ORDER BY updated_at DESC
LIMIT 1
'''
bindings = [chunk_x, chunk_y]
if as_of is not None:
bindings.append(as_of)
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cur.execute(query, bindings)
fetch = cur.fetchone()
if fetch is None:
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raise IndexError(f'{chunk_x}, {chunk_y}')
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(x, y, data) = fetch
data = gzip.decompress(data)
return (x, y, data)
def get_chunk(chunk_x, chunk_y, *args, **kwargs):
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'''
Get the chunk from the database if it exists, or else download it.
'''
try:
return get_chunk_from_db(chunk_x, chunk_y, *args, **kwargs)
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except IndexError:
(bigchunk_x, bigchunk_y) = chunk_to_bigchunk(chunk_x, chunk_y)
chunks = download_bigchunk(bigchunk_x, bigchunk_y)
insert_chunks(chunks)
return get_chunk_from_db(chunk_x, chunk_y, *args, **kwargs)
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def insert_chunk(chunk_x, chunk_y, data, commit=True):
try:
existing_chunk = get_chunk_from_db(chunk_x, chunk_y)
except IndexError:
pass
else:
if data == existing_chunk[2]:
return
# log.debug('Updating chunk %s %s', chunk_x, chunk_y)
data = gzip.compress(data)
cur.execute('INSERT INTO chunks VALUES(?, ?, ?, ?)', [chunk_x, chunk_y, data, now()])
if commit:
sql.commit()
def insert_chunks(chunks, commit=True):
for (index, chunk) in enumerate(chunks):
if index % 25000 == 0 and commit:
sql.commit()
insert_chunk(*chunk, commit=False)
if commit:
sql.commit()
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# API FUNCTIONS
################################################################################
def url_for_bigchunk(bigchunk_x, bigchunk_y):
return f'http://api.pixelcanvas.io/api/bigchunk/{bigchunk_x}.{bigchunk_y}.bmp'
def request(url):
response = requests.get(url)
response.raise_for_status()
return response
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def download_bigchunk(bigchunk_x, bigchunk_y):
'''
Download a bigchunk and return the list of chunks.
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'''
url = url_for_bigchunk(bigchunk_x, bigchunk_y)
logging.info('Downloading %s', url)
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response = request(url)
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bigchunk_data = response.content
if len(bigchunk_data) != BIGCHUNK_SIZE_BYTES:
message = 'Received bigchunk does not matched the expected byte size!\n'
message += 'Got %d instead of %d' % (len(bigchunk_data), BIGCHUNK_SIZE_BYTES)
raise ValueError(message)
chunks = split_bigchunk(bigchunk_x, bigchunk_y, bigchunk_data)
return chunks
def download_bigchunk_range(bigchunk_xy1, bigchunk_xy2, shuffle=False, threads=1):
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'''
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Given (UPPERLEFT_X, UPPERLEFT_Y), (LOWERRIGHT_X, LOWERRIGHT_Y),
download multiple bigchunks, and yield all of the small chunks.
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'''
bigchunks = bigchunk_range_iterator(bigchunk_xy1, bigchunk_xy2)
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if shuffle:
bigchunks = list(bigchunks)
random.shuffle(bigchunks)
if threads < 1:
raise ValueError(threads)
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if threads == 1:
for (x, y) in bigchunks:
chunks = download_bigchunk(x, y)
yield from chunks
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else:
pool = threadpool.ThreadPool(size=threads)
kwargss = [
{'function': download_bigchunk, 'args': (x, y), 'name': (x, y),}
for (x, y) in bigchunks
]
jobs = pool.add_many(kwargss)
while jobs:
job = jobs.pop(0)
job.join()
if job.exception:
raise job.exception
yield from job.value
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# CHUNK FUNCTIONS
################################################################################
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def chunk_range_iterator(chunk_xy1, chunk_xy2):
'''
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Given (UPPERLEFT_X, UPPERLEFT_Y), (LOWERRIGHT_X, LOWERRIGHT_Y),
yield (x, y) pairs for chunks in this range, inclusive.
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'''
for x in range(chunk_xy1[0], chunk_xy2[0] + 1):
for y in range(chunk_xy1[1], chunk_xy2[1] + 1):
yield (x, y)
def bigchunk_range_iterator(bigchunk_xy1, bigchunk_xy2):
'''
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Given (UPPERLEFT_X, UPPERLEFT_Y), (LOWERRIGHT_X, LOWERRIGHT_Y),
yield (x, y) pairs for bigchunks in this range, inclusive.
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'''
for x in range(bigchunk_xy1[0], bigchunk_xy2[0] + BIGCHUNK_SIZE_CHUNKS, BIGCHUNK_SIZE_CHUNKS):
for y in range(bigchunk_xy1[1], bigchunk_xy2[1] + BIGCHUNK_SIZE_CHUNKS, BIGCHUNK_SIZE_CHUNKS):
yield (x, y)
def chunk_to_bigchunk(chunk_x, chunk_y):
bigchunk_x = (chunk_x // BIGCHUNK_SIZE_CHUNKS) * BIGCHUNK_SIZE_CHUNKS
bigchunk_y = (chunk_y // BIGCHUNK_SIZE_CHUNKS) * BIGCHUNK_SIZE_CHUNKS
# log.debug('Converted chunk %s, %s to bigchunk %s, %s', chunk_x, chunk_y, bigchunk_x, bigchunk_y)
return (bigchunk_x, bigchunk_y)
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def chunk_range_to_bigchunk_range(chunk_xy1, chunk_xy2):
bigchunk_range = (chunk_to_bigchunk(*chunk_xy1), chunk_to_bigchunk(*chunk_xy2))
return bigchunk_range
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def chunk_to_pixel(chunk_x, chunk_y):
pixel_x = chunk_x * CHUNK_SIZE_PIX - ORIGIN_OFFSET_X
pixel_y = chunk_y * CHUNK_SIZE_PIX - ORIGIN_OFFSET_Y
# log.debug('Converted chunk %s, %s to pixel %s, %s', chunk_x, chunk_y, pixel_x, pixel_y)
return (pixel_x, pixel_y)
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def chunk_range_to_pixel_range(chunk_xy1, chunk_xy2):
pixel_range = (chunk_to_pixel(*chunk_xy1), chunk_to_pixel(*chunk_xy2))
return pixel_range
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def pixel_to_chunk(pixel_x, pixel_y):
chunk_x = (pixel_x + ORIGIN_OFFSET_X) // CHUNK_SIZE_PIX
chunk_y = (pixel_y + ORIGIN_OFFSET_Y) // CHUNK_SIZE_PIX
# log.debug('Converted pixel %s, %s to chunk %s, %s', pixel_x, pixel_y, chunk_x, chunk_y)
return (chunk_x, chunk_y)
def pixel_range_to_chunk_range(pixel_xy1, pixel_xy2):
chunk_range = (pixel_to_chunk(*pixel_xy1), pixel_to_chunk(*pixel_xy2))
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# log.debug('Converted pixel range %s, %s to chunk range %s, %s', pixel_xy1, pixel_xy2, *chunk_range)
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return chunk_range
def pixel_to_bigchunk(pixel_x, pixel_y):
bigchunk_x = ((pixel_x + ORIGIN_OFFSET_X) // BIGCHUNK_SIZE_PIX) * BIGCHUNK_SIZE_CHUNKS
bigchunk_y = ((pixel_y + ORIGIN_OFFSET_Y) // BIGCHUNK_SIZE_PIX) * BIGCHUNK_SIZE_CHUNKS
# log.debug('Converted pixel %s, %s to bigchunk %s, %s', pixel_x, pixel_y, bigchunk_x, bigchunk_y)
return (bigchunk_x, bigchunk_y)
def pixel_range_to_bigchunk_range(pixel_xy1, pixel_xy2):
bigchunk_range = (pixel_to_bigchunk(*pixel_xy1), pixel_to_bigchunk(*pixel_xy2))
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# log.debug('Converted pixel range %s, %s to bigchunk range %s, %s', pixel_xy1, pixel_xy2, *bigchunk_range)
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return bigchunk_range
def split_bigchunk(bigchunk_x, bigchunk_y, bigchunk_data):
'''
Chunks are downloaded from the site as a "bigchunk" which is just 15x15
chunks stitched together.
The chunks are arranged left to right, top to bottom.
For example, the byte stream:
000011112222333344445555666677778888
represents the bitmap:
001122
001122
334455
334455
667788
667788
'''
chunks = []
chunk_count = int(len(bigchunk_data) / CHUNK_SIZE_BYTES)
for chunk_index in range(chunk_count):
chunk_x = (chunk_index % BIGCHUNK_SIZE_CHUNKS) + bigchunk_x
chunk_y = (chunk_index // BIGCHUNK_SIZE_CHUNKS) + bigchunk_y
start_index = chunk_index * CHUNK_SIZE_BYTES
end_index = start_index + CHUNK_SIZE_BYTES
chunk_data = bigchunk_data[start_index:end_index]
chunk = (chunk_x, chunk_y, chunk_data)
chunks.append(chunk)
return chunks
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# IMAGE FUNCTIONS
################################################################################
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def chunk_to_rgb(chunk_data):
'''
Convert the data chunk into RGB tuples.
PixelCanvas chunks are strings of bytes where every byte represents two
horizontal pixels. Each pixel is 4 bits since there are 16 colors.
Chunks are 32x64 bytes for a total of 64x64 pixels.
'''
# Each byte actually represents two horizontal pixels. 8F is actually 8, F.
# So create a generator that takes in the bytes and yields the pixel bits.
pixels = (
pixel
for byte in chunk_data
for pixel in (byte >> 4, byte & 0xf)
)
matrix = [None for x in range(len(chunk_data) * 2)]
for (index, pixel) in enumerate(pixels):
px = index % CHUNK_SIZE_PIX
py = index // CHUNK_SIZE_PIX
matrix[(py * CHUNK_SIZE_PIX) + px] = COLOR_MAP[pixel]
return matrix
def rgb_to_image(matrix):
matrix = bytes([color for pixel in matrix for color in pixel])
i = PIL.Image.frombytes(mode='RGB', size=(CHUNK_SIZE_PIX, CHUNK_SIZE_PIX), data=matrix)
return i
def chunk_to_image(chunk_data, scale=1):
image = rgb_to_image(chunk_to_rgb(chunk_data))
if scale is not None and scale != 1:
new_size = (int(image.size[0] * scale), int(image.size[1] * scale))
image = image.resize(new_size, resample=PIL.Image.ANTIALIAS)
return image
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def chunks_to_image(chunks, scale=1):
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'''
Combine all of the given chunks into a single image.
'''
log.debug('Creating image from %s chunks', len(chunks))
min_x = min(chunk[0] for chunk in chunks)
max_x = max(chunk[0] for chunk in chunks)
min_y = min(chunk[1] for chunk in chunks)
max_y = max(chunk[1] for chunk in chunks)
span_x = max_x - min_x + 1
span_y = max_y - min_y + 1
img_width = int(span_x * CHUNK_SIZE_PIX * scale)
img_height = int(span_y * CHUNK_SIZE_PIX * scale)
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img = PIL.Image.new(mode='RGB', size=(img_width, img_height), color=WHITE)
for (chunk_x, chunk_y, chunk_data) in chunks:
paste_x = int((chunk_x - min_x) * CHUNK_SIZE_PIX * scale)
paste_y = int((chunk_y - min_y) * CHUNK_SIZE_PIX * scale)
chunk_image = chunk_to_image(chunk_data, scale)
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img.paste(chunk_image, (paste_x, paste_y))
return img
def crop_image(image, pixel_xy1, pixel_xy2):
'''
Because the images are rendered on a chunk basis, they are probably larger
than the exact area that you want. Use this function to crop the image to
the exact coordinates.
pixel_xy1 and pixel_xy2 are the world coordinates that you used to get this
image in the first place, not coordinates within this picture.
'''
img_width = pixel_xy2[0] - pixel_xy1[0] + 1
img_height = pixel_xy2[1] - pixel_xy1[1] + 1
basis_xy = chunk_to_pixel(*pixel_to_chunk(*pixel_xy1))
xy1 = (pixel_xy1[0] - (basis_xy[0]), pixel_xy1[1] - (basis_xy[1]))
xy2 = (xy1[0] + img_width, xy1[1] + img_height)
bbox = (xy1[0], xy1[1], xy2[0], xy2[1])
log.debug('Cropping image down to %s', bbox)
image = image.crop(bbox)
return image
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# COMMAND LINE
################################################################################
from voussoirkit import betterhelp
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DOCSTRING = '''
This tool is run from the command line, where you provide the coordinates you
want to download and render.
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The format for typing coordinates is `UPPERLEFT--LOWERRIGHT`. The format for
each of those pieces is `X.Y`.
Sometimes, argparse gets confused by negative coordinates because it thinks
you're trying to provide another argument. Sorry.
If this happens, use a tilde `~` as the negative sign instead.
Remember, because this is an image, up and left are negative;
down and right are positive.
Commands:
{update}
{render}
So, for example:
> pixelcanvas.py update 0.0--100.100
> pixelcanvas.py update ~100.~100--100.100
> pixelcanvas.py update ~1200.300--~900.600
> pixelcanvas.py render 0.0--100.100
> pixelcanvas.py render ~100.~100--100.100 --update
> pixelcanvas.py render ~1200.300--~900.600 --show
'''
SUB_DOCSTRINGS = dict(
overview='''
overview:
Draw an ascii map representing the owned chunks.
'''.strip(),
update='''
update:
Download chunks into the database.
> pixelcanvas.py update ~100.~100--100.100
flags:
--chunks:
The coordinates which you provided are chunk coordinates instead of
pixel coordinates.
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--shuffle:
Download chunks in a random order instead of from corner to corner.
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--threads X:
Use X threads to download bigchunks.
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'''.strip(),
render='''
render:
Export an image as PNG.
> pixelcanvas.py render 0.0--100.100 <flags>
flags:
--chunks:
The coordinates which you provided are chunk coordinates instead of
pixel coordinates.
--scale <float>:
Render the image at a different scale.
For best results, use powers of 2 like 0.5, 0.25, etc.
This will disable the autocropping.
--show:
Instead of saving the image, display it on the screen.
https://pillow.readthedocs.io/en/stable/reference/Image.html#PIL.Image.Image.show
--update:
Update the chunks before exporting them.
'''.strip(),
)
DOCSTRING = betterhelp.add_previews(DOCSTRING, SUB_DOCSTRINGS)
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def parse_coordinate_string(coordinates):
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'''
Convert the given '~100.~100--100.100' to ((-100, -100), (100, 100)).
'''
coordinates = coordinates.strip()
if '--' in coordinates:
(xy1, xy2) = coordinates.split('--', 1)
else:
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# If you are only updating a single chunk.
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xy1 = coordinates
xy2 = coordinates
def split_xy(xy):
xy = xy.replace('~', '-')
xy = xy.replace(',', '.')
(x, y) = xy.split('.')
return (int(x), int(y))
(xy1, xy2) = (split_xy(xy1), split_xy(xy2))
# log.debug('Parsed coordinates %s into %s %s', coordinates, xy1, xy2)
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return (xy1, xy2)
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def overview_argparse(args):
cur.execute('SELECT x, y, updated_at FROM chunks GROUP BY x, y ORDER BY updated_at DESC')
chunks = cur.fetchall()
min_x = min(chunk[0] for chunk in chunks)
max_x = max(chunk[0] for chunk in chunks)
min_y = min(chunk[1] for chunk in chunks)
max_y = max(chunk[1] for chunk in chunks)
width = max_x - min_x + 1
height = max_y - min_y + 1
x_offset = abs(min(min_x, 0))
y_offset = abs(min(min_y, 0))
matrix = [[' ' for x in range(width)] for y in range(height)]
for (x, y, updated_at) in chunks:
x += x_offset
y += y_offset
matrix[y][x] = '.'
for (x, y, updated_at) in chunks:
if (x % 15 == 0) and (y % 15 == 0):
text = f'{x},{y}'
x += x_offset
y += y_offset
for c in text:
matrix[y][x] = c
x+=1
for row in matrix:
for column in row:
print(column, end='')
print()
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def render_argparse(args):
if args.do_update:
update_argparse(args)
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coordinates = parse_coordinate_string(args.coordinates)
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if args.is_chunks:
chunk_range = coordinates
coordinates = chunk_range_to_pixel_range(*coordinates)
else:
chunk_range = pixel_range_to_chunk_range(*coordinates)
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chunks = [get_chunk(*chunk_xy) for chunk_xy in chunk_range_iterator(*chunk_range)]
scale = float(args.scale)
image = chunks_to_image(chunks, scale=scale)
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if scale == 1 and not args.is_chunks:
image = crop_image(image, *coordinates)
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if args.do_show:
image.show()
else:
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((p1x, p1y), (p2x, p2y)) = coordinates
scale_s = f'_{scale}' if scale != 1 else ''
filename = f'{p1x}.{p1y}--{p2x}.{p2y}{scale_s}.png'
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image.save(filename)
log.debug('Wrote %s', filename)
def update_argparse(args):
coordinates = parse_coordinate_string(args.coordinates)
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if args.is_chunks:
bigchunk_range = chunk_range_to_bigchunk_range(*coordinates)
else:
bigchunk_range = pixel_range_to_bigchunk_range(*coordinates)
chunks = download_bigchunk_range(*bigchunk_range, shuffle=args.shuffle, threads=args.threads)
try:
insert_chunks(chunks)
except KeyboardInterrupt:
sql.commit()
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def main(argv):
parser = argparse.ArgumentParser()
subparsers = parser.add_subparsers()
p_update = subparsers.add_parser('update')
p_update.add_argument('coordinates')
p_update.add_argument('--chunks', dest='is_chunks', action='store_true')
p_update.add_argument('--shuffle', dest='shuffle', action='store_true')
p_update.add_argument('--threads', dest='threads', type=int, default=1)
p_update.set_defaults(func=update_argparse)
p_render = subparsers.add_parser('render')
p_render.add_argument('coordinates')
p_render.add_argument('--chunks', dest='is_chunks', action='store_true')
p_render.add_argument('--update', dest='do_update', action='store_true')
p_render.add_argument('--show', dest='do_show', action='store_true')
p_render.add_argument('--scale', dest='scale', default=1)
p_render.set_defaults(func=render_argparse)
p_overview = subparsers.add_parser('overview')
p_overview.set_defaults(func=overview_argparse)
return betterhelp.subparser_main(
argv,
parser,
main_docstring=DOCSTRING,
sub_docstrings=SUB_DOCSTRINGS,
)
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if __name__ == '__main__':
raise SystemExit(main(sys.argv[1:]))