kopia lustrzana https://github.com/peterhinch/micropython-micro-gui
64 wiersze
2.3 KiB
Python
64 wiersze
2.3 KiB
Python
# qrcode.py Provides the QRMap widget to display the output of uQR library.
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# Released under the MIT License (MIT). See LICENSE.
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# Copyright (c) 2022 Peter Hinch
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from framebuf import FrameBuffer, MONO_HLSB
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from gui.core.ugui import Widget
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from gui.core.colors import *
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from gui.core.ugui import ssd
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from uQR import QRCode
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from utime import ticks_diff, ticks_ms
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class QRMap(Widget):
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@staticmethod
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def len_side(version):
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return 4 * version + 17
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@staticmethod
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def make_buffer(version, scale):
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side = QRMap.len_side(version) * scale
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width = (side >> 3) + int(side & 7 > 0) # Width in bytes
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return bytearray(side * width)
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def __init__(self, writer, row, col, version=4, scale=1, *, bdcolor=RED, buf=None):
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self._version = version
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self._scale = scale
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self._iside = self.len_side(version) # Dimension of unscaled QR image less border
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side = self._iside * scale
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# Widget allows 4 * scale border around each edge
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border = 4 * scale
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wside = side + 2 * border # Widget dimension
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super().__init__(writer, row, col, wside, wside, BLACK, WHITE, bdcolor, False)
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super()._set_callbacks(self._update, ())
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if buf is None:
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buf = QRMap.make_buffer(version, scale)
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self._fb = FrameBuffer(buf, side, side, MONO_HLSB)
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self._irow = row + border
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self._icol = col + border
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self._qr = QRCode(version, border=0)
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def show(self):
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if super().show(False): # Show white border
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palette = ssd.palette
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palette.bg(self.bgcolor)
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palette.fg(self.fgcolor)
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ssd.blit(self._fb, self._icol, self._irow, -1, palette)
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def _update(self, _): # Runs when value changes
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t = ticks_ms()
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qr = self._qr
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qr.clear()
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qr.add_data(self._value)
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matrix = qr.get_matrix() # 750ms. Rest of the routine adds 50ms
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if qr.version != self._version:
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raise ValueError("Text too long for QR version.")
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wd = self._iside
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s = self._scale
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for row in range(wd):
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for col in range(wd):
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v = matrix[row][col]
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for nc in range(s):
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for nr in range(s):
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self._fb.pixel(col * s + nc, row * s + nr, v)
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