Factory:工厂类，负责创建对应的子类（Shape).

MyShape:图形抽象父类.

Line:线

Circle:圆

Rectangle:矩形

ShapeType:图形类别枚举

文件组织

//MyShape.h

#pragma once

#include <iostream>

using namespace std;

class MyShape

{

public:

MyShape();

~MyShape();

public:

virtual void Draw()=0;

};

//-------------------

//MyShape.cpp

#include "MyShape.h"

MyShape::MyShape()

{

}

MyShape::~MyShape()

{

}

//==========================

//Line.h

#pragma once

#include "myshape.h"

class Line :

public MyShape

{

public:

Line();

~Line();

public:

virtual void Draw();

};

//---------------

//LIne.cpp

#include "Line.h"

Line::Line(void)

{

}

Line::~Line(void)

{

}

void Line::Draw()

{

cout<<"绘制线..."<<endl;

}

//===========================

//Circle.h

#pragma once

#include "myshape.h"

class Circle :

public MyShape

{

public:

Circle();

~Circle();

public:

virtual void Draw();

};

//------------------

//Circle.cpp

#include "Circle.h"

Circle::Circle(void)

{

}

Circle::~Circle(void)

{

}

void Circle::Draw()

{

cout<<"绘制圆..."<<endl;

}

//=================================

//Rectangle.h

#pragma once

#include "myshape.h"

class Rectangle :

public MyShape

{

public:

Rectangle(void);

~Rectangle(void);

public:

virtual void Draw();

};

//------------------------------

//Rectangle.cpp

#include "Rectangle.h"

Rectangle::Rectangle(void)

{

}

Rectangle::~Rectangle(void)

{

}

void Rectangle::Draw()

{

cout<<"绘制矩形"<<endl;

}

//=======================================

//EShpapeType.h

enum ShapeType

{

//矩形

ERectangle,

//圆形

ECircle,

//线

ELine

};

//Factory.h

#pragma once

#include "EShapeType.h"

#include "MyShape.h"

#include "Line.h"

#include "Circle.h"

#include "Rectangle.h"

class FactoryClass

{

public:

static MyShape* CreateShape(ShapeType type);

};

//---------------------------------

//Factory.cpp

#include "FactoryClass.h"

MyShape* FactoryClass::CreateShape( ShapeType type )

{

switch(type)

{

case ERectangle:

return new Rectangle();

case ECircle:

return new Circle();

case ELine:

return new Line();

}

}

//调用测试

include

using namespace std;

include "FactoryClass.h"

void Func(MyShape *shape);

int main()

{

cout<<"绘制图形测试开始..."<<endl;

MyShape *shape = FactoryClass::CreateShape(ELine);

Func(shape);

shape = FactoryClass::CreateShape(ECircle);

Func(shape);

shape = FactoryClass::CreateShape(ERectangle);

Func(shape);

cout<<"Over..."<<endl;

}

void Func( MyShape *shape )

{

if (shape != NULL)

{

shape->Draw();

delete shape;

shape = NULL;

}

}

//结果：

原文链接: https://www.cnblogs.com/sharpfeng/archive/2011/03/24/1993669.html

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