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67 lines
1.9 KiB
67 lines
1.9 KiB
# SPDX-License-Identifier: BSD-3-Clause
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# Copyright (c) 2021, The Wownero Project.
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import os
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from io import BytesIO
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import pyqrcode
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from PIL import Image, ImageDraw
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import settings
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def qr_png(
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address: str,
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size=settings.PIL_IMAGE_DIMENSIONS,
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color_from=(210, 83, 200),
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color_to=(255, 169, 62)
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) -> BytesIO:
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"""Pretty QR c0dez j00"""
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created = pyqrcode.create(address, error='L')
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buffer = BytesIO()
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result = BytesIO()
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created.png(buffer, scale=14, quiet_zone=2)
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im = Image.open(buffer)
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im = im.convert("RGBA")
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im.thumbnail(size)
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im_data = im.getdata()
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# make black color transparent
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im_transparent = []
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for color_point in im_data:
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if sum(color_point[:3]) == 255 * 3:
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im_transparent.append(color_point)
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else:
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# get rid of the subtle grey borders
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alpha = 0 if color_from and color_to else 1
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im_transparent.append((0, 0, 0, alpha))
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continue
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if not color_from and not color_to:
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im.save(result, format="PNG", quality=settings.PIL_QUALITY, optimize=settings.PIL_OPTIMIZE)
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result.seek(0)
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return result
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# turn QR into a gradient
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im.putdata(im_transparent)
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gradient = Image.new('RGBA', im.size, color=0)
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draw = ImageDraw.Draw(gradient)
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for i, color in enumerate(gradient_interpolate(color_from, color_to, im.width * 2)):
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draw.line([(i, 0), (0, i)], tuple(color), width=1)
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im_gradient = Image.alpha_composite(gradient, im)
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im_gradient.save(result, format="PNG", quality=settings.PIL_QUALITY, optimize=settings.PIL_OPTIMIZE)
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result.seek(0)
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return result
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def gradient_interpolate(color_from, color_to, interval):
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det_co = [(t - f) / interval for f, t in zip(color_from, color_to)]
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for i in range(interval):
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yield [round(f + det * i) for f, det in zip(color_from, det_co)]
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