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from __future__ import absolute_import
import abc
from typing import TYPE_CHECKING
if TYPE_CHECKING:
from qrcode.image.base import BaseImage
class QRModuleDrawer(abc.ABC):
"""
QRModuleDrawer exists to draw the modules of the QR Code onto images.
For this, technically all that is necessary is a ``drawrect(self, box,
is_active)`` function which takes in the box in which it is to draw,
whether or not the box is "active" (a module exists there). If
``needs_neighbors`` is set to True, then the method should also accept a
``neighbors`` kwarg (the neighboring pixels).
It is frequently necessary to also implement an "initialize" function to
set up values that only the containing Image class knows about.
For examples of what these look like, see doc/module_drawers.png
"""
needs_neighbors = False
def __init__(self, **kwargs):
pass
def initialize(self, img: "BaseImage") -> None:
self.img = img
@abc.abstractmethod
def drawrect(self, box, is_active) -> None:
...