本次实验属于模仿型实验，通过本次实验学生将掌握以下内容：
1、理解享元模式的动机，掌握该模式的结构；
2、能够利用享元模式解决实际问题。
[实验任务一]：围棋
设计一个围棋软件，在系统中只存在一个白棋对象和一个黑棋对象，但是它们可以在棋盘的不同位置显示多次。
实验要求：
1. 提交类图；
2.提交源代码；
3.注意编程规范；
4.要求用简单工厂模式和单例模式实现享元工厂类的设计。
#include <iostream>
#include <map>
#include <vector>
using namespace std;
typedef struct Coordinates
{
int x;
int y;
Coordinates(){}
Coordinates(int a, int b){x=a;y=b;}
bool operator <(const Coordinates& other) const
{
if (x<other.x) return true;
else if (x==other.x) return y<other.y;
return false;
}
}POINT;
typedef enum PieceColorTag
{
BLACK,
WHITE
}PIECECOLOR;
class CPiece
{
public:
CPiece(PIECECOLOR color) : m_color(color){}
PIECECOLOR GetColor() { return m_color; }
// Set the external state
void SetPoint(POINT point) { m_point = point; }
POINT GetPoint() { return m_point; }
protected:
// Internal state
PIECECOLOR m_color;
// external state
POINT m_point;
};
class CGomoku : public CPiece
{
public:
CGomoku(PIECECOLOR color) : CPiece(color){}
};
class IgoChessmanFactory
{
public:
CPiece *GetPiece(PIECECOLOR color)
{
CPiece *pPiece = NULL;
if (m_vecPiece.empty())
{
pPiece = new CGomoku(color);
m_vecPiece.push_back(pPiece);
}
else
{
for (vector<CPiece *>::iterator it = m_vecPiece.begin(); it != m_vecPiece.end(); ++it)
{
if ((*it)->GetColor() == color)
{
pPiece = *it;
break;
}
}
if (pPiece == NULL)
{
pPiece = new CGomoku(color);
m_vecPiece.push_back(pPiece);
}
}
return pPiece;
}
~IgoChessmanFactory()
{
for (vector<CPiece *>::iterator it = m_vecPiece.begin(); it != m_vecPiece.end(); ++it)
{
if (*it != NULL)
{
delete *it;
*it = NULL;
}
}
}
private:
vector<CPiece *> m_vecPiece;
};
class IgoChessman
{
public:
void Draw(CPiece *piece)
{
if (piece->GetColor())
{
cout<<"Draw a White"<<" at ("<<piece->GetPoint().x<<","<<piece->GetPoint().y<<")"<<endl;
}
else
{
cout<<"Draw a Black"<<" at ("<<piece->GetPoint().x<<","<<piece->GetPoint().y<<")"<<endl;
}
m_mapPieces.insert(pair<POINT, CPiece *>(piece->GetPoint(), piece));
}
void ShowAllPieces()
{
for (map<POINT, CPiece *>::iterator it = m_mapPieces.begin(); it != m_mapPieces.end(); ++it)
{
if (it->second->GetColor())
{
cout<<"("<<it->first.x<<","<<it->first.y<<") has a White chese."<<endl;
}
else
{
cout<<"("<<it->first.x<<","<<it->first.y<<") has a Black chese."<<endl;
}
}
}
private:
map<POINT, CPiece *> m_mapPieces;
};
int main()
{
IgoChessmanFactory *pPieceFactory = new IgoChessmanFactory();
IgoChessman *pCheseboard = new IgoChessman();
// The player1 get a white piece from the pieces bowl
CPiece *pPiece = pPieceFactory->GetPiece(WHITE);
pPiece->SetPoint(POINT(2, 3));
pCheseboard->Draw(pPiece);
// The player2 get a black piece from the pieces bowl
pPiece = pPieceFactory->GetPiece(BLACK);
pPiece->SetPoint(POINT(4, 5));
pCheseboard->Draw(pPiece);
// The player1 get a white piece from the pieces bowl
pPiece = pPieceFactory->GetPiece(WHITE);
pPiece->SetPoint(POINT(2, 4));
pCheseboard->Draw(pPiece);
// The player2 get a black piece from the pieces bowl
pPiece = pPieceFactory->GetPiece(BLACK);
pPiece->SetPoint(POINT(3, 5));
pCheseboard->Draw(pPiece);
}
