template <class T>
void Rect_<T>::Union(Pt p) {
	if(IsNull(p)) return;
	if(IsNullInstance()) {
		right = 1 + (left = p.x);
		bottom = 1 + (top = p.y);
	}
	else
	{
		if(p.x >= right) right = p.x +1;
		else if(p.x <  left) left = p.x;
		if(p.y >= bottom) bottom = p.y +1;
		else if(p.y < top) top = p.y;
	}
}

template <>
inline void Rect_<double>::Union(Point_<double> p) {
	if(IsNull(p)) return;
	if(IsNullInstance())
	{
		left = right = p.x;
		top = bottom = p.y;
	}
	else
	{
		if(p.x < left) left = p.x;
		else if(p.x > right) right = p.x;
		if(p.y < top) top = p.y;
		else if(p.y > bottom) bottom = p.y;
	}
}