def __init__(self, boxout):
assert boxout.is_bbox<EOL>Affine2DBase.__init__(self)<EOL>self._boxout = boxout<EOL>self.set_children(boxout)<EOL>self._mtx = None<EOL>self._inverted = None<EOL>
Create a new :class:`BboxTransformTo` that linearly transforms
points from the unit bounding box to *boxout*.