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#include <iostream>
#include <string>
using namespace std;
///////////////////////////////////////
class Shape //parent class
{
protected:
static int numShapes; //keeps track of number of shapes that exist and are available to be rendered, class scope
public:
Shape() //constructor
{
++numShapes; //increment number of shapes when user adds a new one
}
virtual ~Shape() //virtual destructor
{
--numShapes; //decrement number of shapes when user deletes an existing one
}
static int getNumShapes() //retrieves value of the numShapes member, number of shapes entered by user
{
if(numShapes == 0)
{cout << "No shapes to display";}
else
return numShapes;
};
virtual void print() = 0; //display textual description of the shape object
virtual void draw() = 0; //renders shape on the console window
};
//////////////////////////////////////////////////////////////////////////////
//four concrete subclasses provide customized implementations for print and draw methods
//Shape class cannot be instantiated, objects can only be created from the subclasses
//////////////////////////////////////////////////////////////////////////////
class Triangle: public Shape
{
private:
int base, height;
public:
Triangle(int b, int h): //constructor 2-args
base(b), height(h) //initialize member width and height
{
numShapes++;
}
~Triangle(); //deconstructor
void print() //textual description of the shape
{
cout << "Triangle with base " << base <<", and height " << height; //display description
}
void draw()
{
}
};
//////////////////////////////////////////
class Rectangle: public Shape
{
protected:
int width;
int height;
public:
Rectangle(int w, int h): //constructor 2-args
width(w), height(h) //initialize member width and height
{
numShapes++;
}
~Rectangle(); //deconstructor
void print() //textual description of the shape
{
cout << "Rectangle with dimensions (" << width <<", " << height << ")"; //display description
}
void draw() //draws shape
{
cout << string(width, '+' ) << endl;
for( int j = 0; j < height - 2; ++j )
cout<< '+'<< string(width - 2, ' ')<< '+' << endl;
cout << string( width, '+' ) << endl;
}
};
//////////////////////////////////////////
class Square: public Rectangle
{
private:
int width;
int height;
public:
~Square(); //deconstructor
void print()
{
cout << "Square with demensions (" << width <<", " << height << ")";
}
void draw() //draws shape
{
cout << string(width, '+' ) << endl;
for(int j = 0; j < height - 2; ++j )
cout<< '+'<< string(width - 2, ' ')<< '+' << endl;
cout << string( width, '+' ) << endl;
}
};
//////////////////////////////////////////
class Diamond: public Shape
{
private:
int width, height;
public:
Diamond(int w, int h): //constructor 1-arg
width(w), height(h) //initialize member width
{
numShapes++;
}
~Diamond();
void print()
{
cout << "Diamond with width " << width << " and height " << height <<endl;
}
void draw()
{
}
};
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