107 lines
2.7 KiB
Python
107 lines
2.7 KiB
Python
import base64
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import random
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from hashlib import md5
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from io import StringIO
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from PIL import Image, ImageDraw
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GRID_SIZE = 5
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BORDER_SIZE = 20
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SQUARE_SIZE = 40
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class Identicon(object):
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def __init__(self, str_, background="#fafbfc"):
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"""
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`str_` is the string used to generate the identicon.
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`background` is the background of the identicon.
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"""
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w = h = BORDER_SIZE * 2 + SQUARE_SIZE * GRID_SIZE
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self.image = Image.new("RGB", (w, h), background)
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self.draw = ImageDraw.Draw(self.image)
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self.hash = self.digest(str_)
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def digest(self, str_):
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"""
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Returns a md5 numeric hash
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"""
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return int(md5(str_.encode("utf-8")).hexdigest(), 16)
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def calculate(self):
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"""
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Creates the identicon.
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First three bytes are used to generate the color,
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remaining bytes are used to create the drawing
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"""
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# color = (self.hash & 0xff, self.hash >> 8 & 0xff, self.hash >> 16 & 0xff)
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color = random.choice(
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(
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(254, 196, 197),
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(253, 138, 139),
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(254, 231, 206),
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(254, 208, 159),
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(210, 211, 253),
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(163, 165, 252),
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(247, 213, 247),
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(242, 172, 238),
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(235, 247, 206),
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(217, 241, 157),
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(211, 248, 237),
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(167, 242, 221),
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(255, 249, 207),
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(254, 245, 161),
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(211, 241, 254),
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(168, 228, 254),
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(207, 245, 210),
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(159, 235, 164),
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)
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)
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# print color
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# color = (254, 232, 206)
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self.hash >>= 24 # skip first three bytes
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square_x = square_y = 0 # init square position
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for x in range(GRID_SIZE * (GRID_SIZE + 1) // 2):
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if self.hash & 1:
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x = BORDER_SIZE + square_x * SQUARE_SIZE
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y = BORDER_SIZE + square_y * SQUARE_SIZE
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self.draw.rectangle((x, y, x + SQUARE_SIZE, y + SQUARE_SIZE), fill=color, outline=color)
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# following is just for mirroring
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x = BORDER_SIZE + (GRID_SIZE - 1 - square_x) * SQUARE_SIZE
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self.draw.rectangle((x, y, x + SQUARE_SIZE, y + SQUARE_SIZE), fill=color, outline=color)
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self.hash >>= 1 # shift to right
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square_y += 1
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if square_y == GRID_SIZE: # done with first column
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square_y = 0
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square_x += 1
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def generate(self):
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"""
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Save and show calculated identicon
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"""
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self.calculate()
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with open("identicon.png", "wb") as out:
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self.image.save(out, "PNG")
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self.image.show()
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def base64(self, format="PNG"):
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"""
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usage: i = Identicon('xx')
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print(i.base64())
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return: this image's base64 code
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created by: liuzheng712
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bug report: https://github.com/liuzheng712/identicons/issues
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"""
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self.calculate()
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fp = StringIO()
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self.image.encoderinfo = {}
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self.image.encoderconfig = ()
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if format.upper() not in Image.SAVE:
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Image.init()
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save_handler = Image.SAVE[format.upper()]
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try:
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save_handler(self.image, fp, "")
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finally:
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fp.seek(0)
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return "data:image/png;base64,{0}".format(base64.b64encode(fp.read()))
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