kopia lustrzana https://github.com/pimoroni/pimoroni-pico
81 wiersze
2.0 KiB
Python
81 wiersze
2.0 KiB
Python
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import gc
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import random
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import jpegdec
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from urllib import urequest
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gc.collect() # We're really gonna need that RAM!
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graphics = None
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WIDTH = 0
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HEIGHT = 0
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FILENAME = "random-joke.jpg"
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JOKE_IDS = "https://pimoroni.github.io/feed2image/jokeapi-ids.txt"
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JOKE_IMG = "https://pimoroni.github.io/feed2image/jokeapi-{}-{}x{}.jpg"
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gc.collect() # Claw back some RAM!
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# We don't have the RAM to store the list of Joke IDs in memory.
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# the first line of `jokeapi-ids.txt` is a COUNT of IDs.
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# Grab it, then pick a random line between 0 and COUNT.
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# Seek to that line and ...y'know... there's our totally random joke ID
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def update():
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try:
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socket = urequest.urlopen(JOKE_IDS)
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except OSError:
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return
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# Get the first line, which is a count of the joke IDs
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number_of_lines = int(socket.readline().decode("ascii"))
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print("Total jokes {}".format(number_of_lines))
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# Pick a random joke (by its line number)
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line = random.randint(0, number_of_lines)
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print("Getting ID from line {}".format(line))
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for x in range(line): # Throw away lines to get where we need
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socket.readline()
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# Read our chosen joke ID!
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random_joke_id = int(socket.readline().decode("ascii"))
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socket.close()
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print("Random joke ID: {}".format(random_joke_id))
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url = JOKE_IMG.format(random_joke_id, WIDTH, HEIGHT)
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socket = urequest.urlopen(url)
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# Stream the image data from the socket onto disk in 1024 byte chunks
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# the 600x448-ish jpeg will be roughly ~24k, we really don't have the RAM!
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data = bytearray(1024)
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with open(FILENAME, "wb") as f:
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while True:
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if socket.readinto(data) == 0:
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break
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f.write(data)
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socket.close()
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del data
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gc.collect() # We really are tight on RAM!
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def draw():
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jpeg = jpegdec.JPEG(graphics)
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gc.collect() # For good measure...
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graphics.set_pen(1)
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graphics.clear()
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try:
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jpeg.open_file(FILENAME)
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jpeg.decode()
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except OSError:
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return
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graphics.update()
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