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/*
* ActivatableBoardGame sample:
* This is an example that demonstrates the use of Activatable interactors in the context of a board game.
*
* Copyright 2013 Tobii Technology AB. All rights reserved.
*/
#include "stdafx.h"
#include "Board.h"
#include <cassert>
#include <vector>
#include "Observer.h"
// initialize the random number generator.
auto const seed = std::random_device()();
std::mt19937 Board::_randomNumberGenerator(seed);
Board::Board(int size)
: _size(size), _board(nullptr), _boardChangedObserver(nullptr)
{
_board = new Marker[_size * _size];
BeginNewGame();
}
Board::~Board()
{
delete[] _board;
}
void Board::InitBoard()
{
for (int i = 0; i < _size; ++i)
{
for (int j = 0; j < _size; ++j)
{
SetMarkerAt(Position(i, j), Marker::None);
}
}
SetMarkerAt(Position((_size - 1) / 2, (_size - 1) / 2), Marker::X);
SetMarkerAt(Position((_size - 1) / 2, (_size - 1) / 2 + 1), Marker::O);
SetMarkerAt(Position((_size - 1) / 2 + 1, (_size - 1) / 2), Marker::O);
SetMarkerAt(Position((_size - 1) / 2 + 1, (_size - 1) / 2 + 1), Marker::X);
}
Board::Marker Board::GetMarkerAt(Position position) const
{
assert(IsValidPosition(position));
return _board[position.column + position.row * _size];
}
void Board::SetMarkerAt(Position position, Marker marker)
{
assert(IsValidPosition(position));
_board[position.column + position.row * _size] = marker;
NotifyObserver();
}
void Board::MakeHumanPlayerMove(Position position)
{
if (_playerInTurn == Marker::X &&
!IsGameOver() &&
GetMarkerAt(position) == Marker::None)
{
MakeMove(position);
if (!IsGameOver())
{
MakeAIPlayerMove();
}
}
}
bool Board::CanMakeMoveAt(Position position) const
{
return IsValidPosition(position) &&
GetMarkerAt(position) == Marker::None;
}
void Board::BeginNewGame()
{
InitBoard();
_playerInTurn = Marker::X;
_winner = Marker::None;
}
bool Board::IsValidPosition(Position position) const
{
return 0 <= position.row && position.row < _size &&
0 <= position.column && position.column < _size;
}
void Board::MakeAIPlayerMove()
{
// generate the list of all possible moves. not that they are good or anything, just possible.
std::vector<Position> possibleMoves;
for (int i = 0; i < _size; i++)
{
for (int j = 0; j < _size; j++)
{
Position position(i, j);
if (GetMarkerAt(position) == Marker::None)
{
possibleMoves.push_back(position);
}
}
}
// since we check whether the game is a draw before calling this method, there should always be at least one possible move.
assert(possibleMoves.size() > 0);
// pick a move at random.
std::uniform_int_distribution<int> idist(0, (int)possibleMoves.size() - 1);
int randomMoveIndex = idist(_randomNumberGenerator);
MakeMove(possibleMoves[randomMoveIndex]);
}
void Board::MakeMove(Position position)
{
SetMarkerAt(position, _playerInTurn);
_playerInTurn = (_playerInTurn == Marker::O) ? Marker::X : Marker::O;
DetectWinner(position);
DetectDrawGame();
}
void Board::DetectWinner(Position position)
{
auto marker = GetMarkerAt(position);
for (int i = 0; i < OrientationMaxValue; ++i)
{
Orientation orientation = (Orientation)i;
int sequenceLength(1);
bool directions[] = { true, false };
for each (auto forward in directions)
{
auto neighbor = GetAdjacentPosition(position, orientation, forward);
while (IsValidPosition(neighbor) && GetMarkerAt(neighbor) == marker)
{
sequenceLength++;
neighbor = GetAdjacentPosition(neighbor, orientation, forward);
}
}
if (sequenceLength >= WinningSequenceLength)
{
_winner = marker;
_playerInTurn = Marker::None;
NotifyObserver();
}
}
}
void Board::DetectDrawGame()
{
// if there is an empty position, the game isn't a draw (yet).
for (int i = 0; i < _size; ++i)
{
for (int j = 0; j < _size; ++j)
{
if (GetMarkerAt(Position(i, j)) == Marker::None)
{
return;
}
}
}
// no empty positions found: it's a draw.
_playerInTurn = Marker::None;
NotifyObserver();
}
Board::Position Board::GetAdjacentPosition(Position position, Orientation orientation, bool forward) const
{
Position delta(-1, -1);
switch (orientation)
{
case Orientation::North:
delta = Position(+1, 0);
break;
case Orientation::East:
delta = Position(0, +1);
break;
case Orientation::Northeast:
delta = Position(+1, +1);
break;
case Orientation::Southeast:
delta = Position(-1, +1);
break;
default:
assert(false);
}
if (!forward)
{
delta.row = -delta.row;
delta.column = -delta.column;
}
return Position(position.row + delta.row, position.column + delta.column);
}
void Board::RegisterBoardChangedObserver(Observer* boardChangedObserver)
{
_boardChangedObserver = boardChangedObserver;
}
void Board::NotifyObserver()
{
if (_boardChangedObserver)
{
_boardChangedObserver->SubjectChanged();
}
}
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