Class square finding of axis - c++

Question

I am trying to figure out how to find the axis of class Square's axis as shown below? But I've been trying for hours and still did not managed to solve it. Can someone with their high level expertise show me the ropes to do it? Because both center function call and axis function call in main() does call the same x() and y(), hence brought me to a state of confusion. I know the inheritance of square from circle is weird. But it is what my school wants. Note: Main() CANNOT be modified! Thanks!
Output:
Square::axis test failed
8.87627 0.284967
3.82567 0.958537
Tests passed: 50%
#include <iostream>
#include <cstdlib>
#include <ctime>
#include <cmath>
class Object
{
public:
private:
float d;
public:
Object(float n) : d(n){}
Object(){}
float depth() const
{
return d;
}
struct PointType
{
float x2;
float y2;
PointType( float x1, float y1) :x2(x1),y2(y1){}
PointType(){}
float x()
{
return x2;
}
float y()
{
return y2;
}
PointType center()
{
return *this;
}
};
struct VectorType
{
float tx;
float ty;
VectorType( float tx1, float ty1) :tx(tx1),ty(ty1){}
VectorType( ){}
};
virtual ~Object()
{}
};
class Point :public Object
{
private:
PointType mpoint;
public:
Point(const PointType& pt, float& y1) :Object(y1), mpoint(pt) {}
Point(const PointType& pt):mpoint(pt){}
Point(){}
Point center() const
{
return *this;
}
float x()
{
return mpoint.x2;
}
float y()
{
return mpoint.y2;
}
virtual ~Point(){}
};
class Circle : public Point
{
private:
Object::PointType m_pt;
float r;
public:
Circle(const PointType pts, float rad, float dep)
: Point(m_pt,dep),m_pt(pts),r(rad) {}
Circle(const PointType pts, float rad):m_pt(pts),r(rad){}
Circle(){}
float radius() const
{
return r;
}
Circle center() const
{
return *this;
};
float x()
{
return m_pt.x2;
}
float y()
{
return m_pt.y2;
}
};
class Square: public Circle
{
private:
Object::PointType s_pt;
Object::VectorType v_pt;
float a=getRadius();
public:
Square(const PointType spts,const VectorType vpts,float depth) :
Circle(spts,a,depth),s_pt(spts),v_pt(vpts){}
Square(const Object::PointType& spts, const VectorType vpts):s_pt(spts),v_pt(vpts){}
Square axis() const
{
return Square(s_pt,v_pt,getRadius());
}
Square center() const
{
return *this;
}
float radius() const
{
return a;
}
float getRadius() const
{
float rad= sqrt(v_pt.tx * v_pt.tx + v_pt.ty * v_pt.ty);
return rad;
}
float x() const
{
return s_pt.x2;
// v_pt.tx/radius();
}
float y() const
{
return s_pt.y2;
// v_pt.ty/radius();
}
};
const float EPSILON = 1e-5f;
bool is_near(float x, float y)
{
return std::abs(x - y) < EPSILON;
}
float frand()
{
return 10.0f * float(rand()) / float(RAND_MAX);
}
int main()
{
srand(unsigned(time(0)));
int count = 0;
int max_count = 0;
float x = frand();
float y = frand();
float sx = frand();
float sy = frand();
float depth = frand();
Square square(Square::PointType(x, y), Square::VectorType(sx, sy), depth);
if (is_near(square.center().x(), x) &&
is_near(square.center().y(), y))
{
++count;
}
else
{
std::cout << " - Square::center test failed" << std::endl;
}
++max_count;
float radius = std::sqrt(sx * sx + sy * sy);
if (is_near(square.axis().x(), sx / radius) &&
is_near(square.axis().y(), sy / radius))
{
++count;
}
else
{
std::cout << " - Square::axis test failed" << std::endl;
}
++max_count;
std::cout << square.axis().x()<< " " << sx / radius<<std::endl;
std::cout << square.axis().y()<< " " << sy / radius<<std::endl;
int result = static_cast<int>(
100.0f * static_cast<float>(count) / static_cast<float>(max_count) + 0.5f
);
std::cout << "Tests passed: " << result << "%" << std::endl;
return result;
}