65 lines
1.8 KiB
Python
65 lines
1.8 KiB
Python
import abc
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class BaseImage(object):
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"""
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Base QRCode image output class.
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"""
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kind = None
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allowed_kinds = None
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def __init__(self, border, width, box_size, *args, **kwargs):
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self.border = border
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self.width = width
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self.box_size = box_size
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self.pixel_size = (self.width + self.border*2) * self.box_size
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self._img = self.new_image(**kwargs)
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@abc.abstractmethod
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def drawrect(self, row, col):
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"""
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Draw a single rectangle of the QR code.
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"""
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@abc.abstractmethod
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def save(self, stream, kind=None):
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"""
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Save the image file.
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"""
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def pixel_box(self, row, col):
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"""
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A helper method for pixel-based image generators that specifies the
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four pixel coordinates for a single rect.
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"""
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x = (col + self.border) * self.box_size
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y = (row + self.border) * self.box_size
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return [(x, y), (x + self.box_size - 1, y + self.box_size - 1)]
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@abc.abstractmethod
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def new_image(self, **kwargs):
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"""
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Build the image class. Subclasses should return the class created.
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"""
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def get_image(self, **kwargs):
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"""
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Return the image class for further processing.
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"""
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return self._img
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def check_kind(self, kind, transform=None):
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"""
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Get the image type.
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"""
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if kind is None:
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kind = self.kind
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allowed = not self.allowed_kinds or kind in self.allowed_kinds
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if transform:
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kind = transform(kind)
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if not allowed:
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allowed = kind in self.allowed_kinds
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if not allowed:
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raise ValueError(
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"Cannot set %s type to %s" % (type(self).__name__, kind))
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return kind
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