C++ 23. 상속과 다형성 실습(도형)

-상속과 다형성 실습 1. 도형

 

//Diagram.h

#pragma once

#include <iostream>

#include <string>

using namespace std;

 

class Diagram

{

                  const int id;

                  static int last_id;

public:

                  Diagram();

                  virtual void Draw() = 0;

protected:

                  int GetID()const;

};

 

 

//Diagram.cpp

#include "Diagram.h"

 

Diagram::Diagram():id(last_id++)

{

}

void Diagram::Draw()

{

}

int Diagram::GetID()const

{

                  return id;

}

 

 

//Line.h

#pragma once

#include "Diagram.h"

#include "POint.h"

 

class Line : public Diagram

{

                  POint *p1;

                  POint *p2;

public:

                  Line(int x1, int y1, int x2, int y2);

                  virtual void Draw();

};

 

 

//Line.cpp

#include "Line.h"

#include "Diagram.h"

 

Line::Line(int x1, int y1, int x2, int y2)

{

                  p1 = new POint(x1,y1);

                  p2 = new POint(x2,y2);

}

void Line::Draw()

{

                  cout<<GetID()<<"선"<<endl;

                  cout<<"(x1 , y1)"<<endl;

                  p1->Draw();

                  cout<<"(x2 , y2)"<<endl;

                  p2->Draw();

}

 

 

//POint.h

#pragma once

#include "Diagram.h"

 

class POint:public Diagram

{

                  int x;

                  int y;

public:

                  POint(int x, int y);

                  virtual void Draw();

};

 

 

//POint.cpp

#include "POint.h"

 

int Diagram::last_id = 1;

 

POint::POint(int x, int y)

{

                  this->x = x;

                  this->y = y;

}

 

void POint::Draw()

{

                  cout<<GetID()<<"점"<<endl;

                  cout<<"x 좌표 :"<<x<<endl;

                  cout<<"y 좌표 :"<<y<<endl;

}

 

 

//REctangle.h

#pragma once

#include "Diagram.h"

#define interface struct

 

interface IGetArea

{

                  virtual int GetArea()const = 0; //순수 가상 메소드

};

 

class REctangle:public Diagram, public IGetArea

{

                  int bottom;

                  int left;

                  int right;

                  int top;

public:

                  REctangle(int left, int top, int right, int bottom);

                  void Draw();

    int GetArea()const;

};

 

 

//REctangle.cpp

#include "REctangle.h"

#include "Diagram.h"

 

REctangle::REctangle(int left, int top, int right, int bottom)

{

                  this->left = left;

                  this->top = top;

                  this->right = right;

                  this->bottom = bottom;

}

 

void REctangle::Draw()

{

                  cout<<GetID()<<"사각형"<<endl;

                  cout<<"왼쪽 상단 좌표(left,top)"<<left<<","<<top<<endl;

                  cout<<"우측 하단 좌표(right,bottom)"<<right<<","<<bottom<<endl;

}

 

int REctangle::GetArea()const

{

                  int width = right - left;

                  if(width < 0)

                  {

                                   width = -width;

                  }

 

                  int height = right - left;

                  if(height < 0)

                  {

                                   height < 0;

                  }

                  return width * height;

}

 

 

//Program.cpp

#include "Diagram.h"

#include "POint.h"

#include "Line.h"

#include "REctangle.h"

 

void TestArea(IGetArea *iga)

{

                  cout<<"사각형의 넓이 : "<<iga->GetArea()<<endl;

}

 

int main(void)

{

                  Diagram *diagrams[3];

                  diagrams[0] = new POint(3,4);

                  diagrams[1] = new Line(0,0,5,5);

                  diagrams[2] = new REctangle(0,0,10,10);

 

                  for(int i = 0; i<3; i++)

    {

        diagrams[i]->Draw();

        IGetArea *iga = dynamic_cast<IGetArea *>(diagrams[i]);

        if(iga)

        {

            TestArea(iga);

        }       

                                   cout<<endl;

    }

                  for(int i = 0; i < 3; i++)

                  {

                                   delete diagrams[i];

                  }

                  return 0;

}