Class _ImageCanvas
object --+
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_ImageCanvas
Objects of this class have an Image and a Canvas, which are accessible
as the .img and .canvas properties. The initializer determines whether to
use cairoCanvas, if available, or fall back to spingCanvas.
This class tries to hide some subtle incompatibilities between the two
canvas classes. In particular, the Cairo canvas "owns" the
image, and if someone else changes it, the underlying C library crashes!
But we need to use the lower-level Image.paste() because none of the
canvas classes support a paste method.
_ImageCanvas works around this issue by deferring the instantiation of
the Cairo canvas until the .canvas property is accessed. Note that once
the Cairo canvas has been instantiatated, changes to the underlying Image
are no longer safe. In other words, the client must do all the pasting
before doing any drawing.
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__init__(self,
size)
x.__init__(...) initializes x; see help(type(x)) for signature |
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Inherited from object:
__delattr__,
__format__,
__getattribute__,
__hash__,
__new__,
__reduce__,
__reduce_ex__,
__repr__,
__setattr__,
__sizeof__,
__str__,
__subclasshook__
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__init__(self,
size)
(Constructor)
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x.__init__(...) initializes x; see help(type(x)) for signature
- Parameters:
size (tuple of int) - size of the image/canvas as (width, height) in pixels - Overrides:
object.__init__
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img
- Get Method:
- unreachable.img(self)
- Type:
- PIL.Image.Image
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canvas
- Get Method:
- unreachable.canvas(self)
- Type:
- rdkit.Chem.Draw.canvasbase.CanvasBase
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