组合模式

写好的代码就是为了以后少写一些代码。

一直找不到合适的例子来演示组合模式，组合模式就像文件夹和文件，像树形的节点和树叶。还是以最经典的例子来演示一下。图元有点、线、圆、方块等，他们组合在一起叫复杂图元。复杂图元组合在一起是另一个复杂图元。

#pragma once
#include 
#include 
#include 
using namespace std;


class 图元
{
public:
	virtual string GetName() = 0;
	virtual void Render(int depth) = 0;
	图元();
	virtual ~图元();
};

class 点 : public 图元
{
private:
	string name;
public:
	点(string name)
	{
		this->name = name;
	}
	string GetName()
	{
		return name;
	}
	void Render(int depth)
	{
		for (int i = 0; i < depth; i++)
		{
			cout << '-';
		}
		cout << name << endl;
	}
};

class 线 : public 图元
{
private:
	string name;
public:
	线(string name)
	{
		this->name = name;
	}
	string GetName()
	{
		return name;
	}
	void Render(int depth)
	{
		for (int i = 0; i < depth; i++)
		{
			cout << '-';
		}
		cout << name << endl;
	}
};

class 圆 : public 图元
{
private:
	string name;
public:
	圆(string name)
	{
		this->name = name;
	}
	string GetName()
	{
		return name;
	}
	void Render(int depth)
	{
		for (int i = 0; i < depth; i++)
		{
			cout << '-';
		}
		cout << name << endl;
	}
};

class 长方形 : public 图元
{
private:
	string name;
public:
	长方形(string name)
	{
		this->name = name;
	}
	string GetName()
	{
		return name;
	}
	void Render(int depth)
	{
		for (int i = 0; i < depth; i++)
		{
			cout << '-';
		}
		cout << name << endl;
	}
};

class 复杂图形 : public 图元
{
private:
	string name;
	vector<图元 *> vecShape;
public:
	复杂图形(string name)
	{
		this->name = name;
	}
	~复杂图形()
	{
		vecShape.clear();
	}

	string GetName()
	{
		return name;
	}

	void Render(int depth)
	{
		for (int i = 0; i < depth; i++)
		{
			cout << '-';
		}
		cout << name << endl;
		for (vector<图元*>::iterator it = vecShape.begin(); it != vecShape.end(); it++)
		{
			(*it)->Render(depth + 4);
		}
	}

	void AddShape(图元 *pShape)
	{
		vecShape.push_back(pShape);
	}

	void RemoveShape(图元 *pShape)
	{
		for (vector<图元*>::iterator it = vecShape.begin(); it != vecShape.end(); it++)
		{
			if ((*it) == pShape)
			{
				vecShape.erase(it);
			}
		}
	}
};




// composite.cpp : 定义控制台应用程序的入口点。
//

#include "stdafx.h"
#include "Shape.h"


int _tmain(int argc, _TCHAR* argv[])
{
	复杂图形 *pShape1 = new 复杂图形("复杂图形一");
	点 *pPoint1 = new 点("点一");
	点 *pPoint2 = new 点("点二");
	线 *pLine1 = new 线("线一");
	pShape1->AddShape(pPoint1);
	pShape1->AddShape(pPoint2);
	pShape1->AddShape(pLine1);

	复杂图形 *pShape2 = new 复杂图形("复杂图形二");
	长方形 *pRectangle = new 长方形("长方形一");
	圆 *pCircle = new 圆("圆形一");
	pShape2->AddShape(pRectangle);
	pShape2->AddShape(pShape1);
	pShape2->AddShape(pCircle);

	pShape2->Render(4);

	delete pShape2;
	delete pRectangle;
	delete pCircle;
	delete pShape1;
	delete pPoint1;
	delete pPoint2;
	delete pLine1;

	getchar();
	return 0;
}