BoundBox operator- (const point_type& rhs) const {
BoundBox result = *this;
result.offset(point_type(-rhs.x, -rhs.y));
return result;
}
/**
* These add the given point to this bbox - they
* offset each corner by this point. Usful for calculating
* the location of a box in a higher scope, or for moving
* it around as part of a calculation
*
* Naturally, the {+,-} don't modify and the {+,-}= do.
*/
BoundBox operator+ (const point_type& rhs) const {
BoundBox result = *this;
result.offset(rhs);
return result;
}