//ChessBoard.h
#pragma once
#define ROW 15
#define COL 15
#include<iostream>
using namespace std;
 
class ChessBoard//棋盘类
{
public:
  char m_cSquare[ROW][COL];  
public:
  ChessBoard();
  void show();  
};

//ChessBoard.cpp
#include"ChessBoard.h"
 
ChessBoard::ChessBoard()  
{  
  for(int i=1;i<ROW-1;i++)
    for(int j=1;j<COL-1;j++)
      m_cSquare[i][j]=' ';
  for(int j=0;j<COL;j++)
    m_cSquare[0][j]=m_cSquare[ROW-1][j]='-';
  for(int i=1;i<ROW;i++)
    m_cSquare[i][0]=m_cSquare[i][COL-1]='|';  
}
 
void ChessBoard::show()
{
  system("cls"); 
  for(int i=0;i<ROW;i++)
  {  for(int j=0;j<COL;j++)
      cout<<m_cSquare[i][j]<<' ';//这里的“ <<' ' ”很重要，这样才能使屏幕上ROW*COL输出为方形
    cout<<endl;
  }
}

//Player.h
#pragma once
//宏定义四种检测五子是否连成线的方向
#define HORIZON     0
#define VERTICAL      1
#define LEFTBOTTOMTORIGHTTOP  2
#define LEFTTOPTORIGHTBOTTOM  3
 
#include"ChessBoard.h"
#include<iostream>
using namespace std;
#include<string>
 
class Player
{
private:
  string m_name;
  char m_chessType;
  int m_x;
  int m_y;
  ChessBoard* m_ptBoard;
public:
  Player(string name,char chessType):m_name(name),m_chessType(chessType),m_ptBoard(NULL){}
  void attachToBoard(ChessBoard* ptBoard){m_ptBoard=ptBoard;}
  bool isInChessBoard(int x,int y);
  bool isLine(int x,int y);
  bool isWin();
  void setChess();
};

//Player.cpp
#include"Player.h"
 
bool Player::isInChessBoard(int x,int y)
{
  if(x<ROW-1 && x>0 && y<COL-1 && y>0)
    return true;
  else
    return false;
}
/*下面是核心代码：如何判断五子是否连成线。
这里采用的是以玩家此刻放下的棋子为中心，从四种方向逐个判断是否在此方向上连成了线
这里将四个方向上的判断都放在一起，避免了四次调用不同方向上的判断，
但在for里面放一个switch有些别扭，可读性上似乎不好*/
bool Player::isLine(int x,int y)
{
  for(int direc=HORIZON;direc<=LEFTTOPTORIGHTBOTTOM;direc++)//四个方向，权宜之计
  {
    int tempX,tempY,cnt=1;//cnt:连续排列的同种类的棋子的个数，达到五个则该方赢
    for(int i=-4;i<=4;i++)
    {
      if(i==0)continue;//此时循环一遍相当于什么都没做
      switch(direc)
      {
      case HORIZON:
        tempX=x;  tempY=y+i;   break;
      case VERTICAL: 
        tempX=x+i; tempY=y;    break;
      case LEFTBOTTOMTORIGHTTOP:
        tempX=x-i; tempY=y+i;   break;
      case LEFTTOPTORIGHTBOTTOM:
        tempX=x+i; tempY=y+i;   break;
      }
      if(isInChessBoard(tempX,tempY) && m_ptBoard->m_cSquare[tempX][tempY]==m_chessType)
        cnt++;
      else
        cnt=0;
      if(cnt==5)//五子成线
        return true;
    }
  }return false;
}
 
void Player::setChess()
{  
  cout<<"请输入玩家"<<m_name<<"的x坐标和y坐标："<<endl;
  cin>>m_x>>m_y;
  while(cin.fail() || m_ptBoard->m_cSquare[m_x][m_y]!=' ')//输入不是int型变量或者此位置上已有棋子
  {
    cout<<"输入有误，请再次输入玩家"<<m_name<<"的x坐标和y坐标："<<endl;
    cin.clear();  //清除fail状态 
    cin.sync();  //清除缓冲区
    cin>>m_x>>m_y;
  }
  if(isInChessBoard(m_x,m_y))
    m_ptBoard->m_cSquare[m_x][m_y]=m_chessType; 
}
 
bool Player::isWin()
{  
  return isLine(m_x,m_y)?true:false;
}

//main.cpp
#include"ChessBoard.h"
#include"Player.h"
 
int main()
{
  ChessBoard board;  
  Player playA("aaa",'*');//玩家aaa的棋子形状是'*'
  playA.attachToBoard(&board);
  Player playB("bbb",'#');//玩家bbb的棋子形状是'#'
  playB.attachToBoard(&board);  
  board.show();
  while(1)
  {
    playA.setChess();//玩家A放下一个棋子
    if(playA.isWin())
    {  cout<<"Winer!"; break;}    
    board.show();
 
    playB.setChess();//玩家B放下一个棋子
    if(playB.isWin())
    {  cout<<"Winer!"; break;}  
    board.show();
  }
  return 1;
}