def shrunk(self, mx, my):
w, h = self.size<EOL>return Bbox([self._points[<NUM_LIT:0>],<EOL>self._points[<NUM_LIT:0>] + [mx * w, my * h]])<EOL>
Return a copy of the :class:`Bbox`, shrunk by the factor *mx*
in the *x* direction and the factor *my* in the *y* direction.
The lower left corner of the box remains unchanged.  Normally
*mx* and *my* will be less than 1, but this is not enforced.