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„ Z RS( sÀ Base class for composite graphical objects.
Objects belong to a canvas, and can be moved around on the canvas.
They also belong to at most one ``pile'' of objects, and can be
transferred between piles (or removed from their pile).
Objects have a canonical ``x, y'' position which is moved when the
object is moved. Where the object is relative to this position
depends on the object; for simple objects, it may be their center.
Objects have mouse sensitivity. They can be clicked, dragged and
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they are in.
All instance attributes are public since the derived class may
need them.
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