Shapes

// Shape.h - NON C'E' cpp
#include "Canvas.h"

class Shape
{
public:
    Shape() {}
    virtual ~Shape() {}
    virtual void draw(Canvas& c) = 0;
};
// Rectangle.h
#include "Shape.h"
#include "Canvas.h"

class Rectangle :
    public Shape
{
private:
    int x;
    int y;
    int width;
    int height;
public:
    Rectangle(int x, int y, int width, int height);
    virtual ~Rectangle();

    void draw(Canvas& c) override;
};

// Rectangle.cpp
#include "Rectangle.h"


Rectangle::Rectangle(int x, int y, int width, int height):
    Shape(),
    x(x), y(y), width(width), height(height)
{
}


Rectangle::~Rectangle()
{
}

void Rectangle::draw(Canvas & c)
{
    // disegno i lati orizzontali del rettangolo
    for (int x1 = 0; x1 <= width; ++x1) {
        c.set(x + x1, y);
        c.set(x + x1, y + height);
    }
    // disegno i lati verticali del rettangolo
    for (int y1 = 0; y1 <= height; ++y1) {
        c.set(x, y + y1);
        c.set(x + width, y + y1);
    }
}
// Square.h - NON C'E' cpp
#include "Rectangle.h"
class Square :
    public Rectangle
{
public:
    Square(int x, int y, int side) :Rectangle(x, y, side, side) {}
    virtual ~Square() {}
};