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/*! \file example.h
This file provides a simple set of Shape classes. */
/*! Base class for all shapes.
\author Bob
*/
class Shape {
public:
/*! Default constructor for creating a Shape */
Shape() {
nshapes++;
}
/*! Destructor for destroying a Shape */
virtual ~Shape() {
nshapes--;
}
double x; /*!< x co-ordinate */
double y; /*!< y co-ordinate */
void move(double dx, double dy); /*!< Move a shape to a new co-ordinate
\param dx x co-ordinate
\param dy y co-ordinate */
virtual double area() = 0; /*!< \return the area */
virtual double perimeter() = 0; /*!< \return the perimeter */
static int nshapes; /*!< Number of shapes currently in existence */
};
/*! A class for representing a circle.
\author Jack
*/
class Circle : public Shape {
private:
double radius;
public:
/*! Construct a circle
* \param r radius of the circle */
Circle(double r);
/*! Calculate the area of the circle
* \return calculated area */
virtual double area();
/*! Calculate the perimeter of the circle
* \return calculated perimeter of the circle */
virtual double perimeter();
};
/// A class for representing a square.
class Square : public Shape {
private:
double width;
public:
/** Construct a square
* \param w width of the square */
Square(double w);
/** Calculate the area of the square
* \return calculated area */
virtual double area();
/** Calculate the perimeter of the square
* \return calculated perimeter of the square */
virtual double perimeter();
};
/// A class for representing a rectangle, templated on the type for the rectangle dimensions
template<typename T>
class Rectangle : public Shape {
private:
T height;
T width;
public:
/** Construct a rectangle
* \param h height of the rectangle
* \param w width of the rectangle */
Rectangle(T h, T w) : height(h), width(w) {}
/** Calculate the area of the rectangle
* \return calculated area */
virtual double area() { return width*height; }
/** Calculate the perimeter of the rectangle
* \return calculated perimeter of the rectangle */
virtual double perimeter() { return 2*height + 2*width; }
};
/*! Factory function for creating a square
* \param r width of the square
* \return a fully constructed square */
Square MakeSquare(double r);
/*! Factory function for creating a circle
* \param w radius of the circle
* \return a fully constructed circle */
Circle MakeCircle(double w);
/*! Factory function for creating a rectangle
* \param h height of the rectangle
* \param w width of the rectangle
* \return a fully constructed rectangle */
template<typename T>
Rectangle<T> MakeRectangle(T h, T w) {
return Rectangle<T>(h, w);
}
/*! Total number of circles ever created */
extern int NumCircles;
/// Total number of squares ever created
extern int NumSquares;
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