// Using Geometrical shapes to demonstarte polymorphism
// RJB Botting April 2009

/* All geometic shapes have a formula for calculating its area and its
   perimeter.... but the actual formula variaes between the shapes
   ....

*/
#include <iostream>
#include <string>
#include <sstream>
#include <cmath>
#include <cstdlib>
using namespace std;

class Point
{
   public:
	double x,y;
	Point(double x0,double y0):x(x0),y(y0){}
	virtual void print(){cout << "Point("<< x << ", " << y << ")"; }
};

class Shape
{
   public:
	virtual double perimeter()=0;
	virtual double area()=0;
	virtual void print()=0;
};
class Square : public Shape
{
	double side;
	Point bottomLeft;
   public:
	Square (double s, Point bl):side(s),bottomLeft(bl){}
	double perimeter(){ return 4*side;}
	double area() { return side*side; }
	void print() { cout << "Square( side = " << side << ", bottomLeft = "; bottomLeft.print(); cout << ")"; }

};

const double PI = 4.0*atan(1.0);

int main()
{
	Square a (2, Point(0,0));
	a.print();
	cout << ", Area =" <<a.area() << ", Perimeter =" << a.perimeter() << endl;

	Shape *ps = &a;
	ps->print();
	cout << ", Area =" <<ps->area() << ", Perimeter =" << ps->perimeter() << endl;

/********
	Circle c (Point(1,1), 1);
	ps=&c;
	ps->print();
	cout << ", Area =" <<ps->area() << ", Perimeter =" << ps->perimeter() << endl;

	Rectangle r (Point(1,2), 2, 3);
	ps=&r;
	ps->print();
	cout << ", Area =" <<ps->area() << ", Perimeter =" << ps->perimeter() << endl;


	ps = new EquilateralTriangle(Point(0,0), 2);
	ps->print(); cout << endl;
	cout << ", Area =" <<ps->area() << ", Perimeter =" << ps->perimeter() << endl;
********/
}