Esempio n. 1
0
    public override void Update()
    {
        if (_character.EmptyPathFindingTileCell() == false)
        {
            TileCell tileCell = _character.PopPathFindingTileCell();

            sPosition curPosition;
            curPosition.x = _character.GetTileX();
            curPosition.y = _character.GetTileY();

            sPosition nextPosition;
            nextPosition.x = tileCell.GetTileX();
            nextPosition.y = tileCell.GetTileY();

            eMoveDirection direction = GetDirection(curPosition, nextPosition);
            _character.SetNextDirection(direction);

            if ((_character.MoveStart(tileCell.GetTileX(), tileCell.GetTileY()) == false))
            {
                //_nextState = eStateType.ATTACK;
                _nextState = eStateType.DISCOVER;
            }
        }

        else
        {
            _nextState = eStateType.IDLE;
        }
    }
    bool CheckPrecondition(eFindMode mode, TileCell nextTileCell, TileCell targetTileCell)
    {
        //if ((null != nextTileCell) && (true == nextTileCell.IsPathfindable() && false == nextTileCell.IsVisit() ||
        //    (nextTileCell.GetTileX() == _targetTileCell.GetTileX() && nextTileCell.GetTileY() == _targetTileCell.GetTileY())))
        //    return true;

        bool condition = false;

        if (false == nextTileCell.IsVisit())
        {
            condition = true;
        }

        if (eFindMode.VIEW_MOVERANGE == mode || eFindMode.FIND_PATH == mode)
        {
            if (condition)
            {
                condition = nextTileCell.CanMove();
            }
        }

        if (eMapType.DUNGEON == GameManager.Instance.GetMapType())
        {
            return(condition);
        }
        else if (eMapType.TOWN == GameManager.Instance.GetMapType())
        {
            //해당 타일이 목표 타일
            if (nextTileCell.GetTileX() == targetTileCell.GetTileX() && nextTileCell.GetTileY() == targetTileCell.GetTileY())
            {
                condition = true;
            }
        }
        return(condition);
    }
Esempio n. 3
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    // Actions
    public void MoveTileCell(TileCell tileCell)
    {
        ResetMoveCooltime();

        TileMap map = GameManager.Instance.GetMap();

        int moveX = tileCell.GetTileX();
        int moveY = tileCell.GetTileY();

        map.ResetObject(_tileX, _tileY, this);
        _tileX = moveX;
        _tileY = moveY;
        map.SetObject(_tileX, _tileY, this, eTileLayer.MIDDLE);
        //pick message 주기
        List <MapObject> mapObejctList = map.GetTileCell(_tileX, _tileY).GetMapObjectList(eTileLayer.MIDDLE);

        for (int i = 0; i < mapObejctList.Count; i++)
        {
            MessageParam msgParam = new MessageParam();
            msgParam.sender   = this;
            msgParam.receiver = mapObejctList[i];
            msgParam.message  = "pick";

            MessageSystem.Instance.Send(msgParam);
        }
    }
    float CalcSimpleHeuristic(TileCell tileCell, TileCell nextTileCell, TileCell targetTileCell)
    {
        float heuristic = 0.0f;

        int diffFromCurrent = 0;
        int diffFromNext    = 0;

        //x축
        {
            //현재타일 ~ 목표타일까지 거리
            diffFromCurrent = tileCell.GetTileX() - targetTileCell.GetTileX();
            diffFromCurrent = Mathf.Abs(diffFromCurrent);
            //다음타일 ~ 목표타일까지 거리
            diffFromNext = nextTileCell.GetTileX() - targetTileCell.GetTileX();
            diffFromNext = Mathf.Abs(diffFromNext);

            if (diffFromCurrent < diffFromNext)
            {
                heuristic += 1.0f;
            }
            else if (diffFromNext < diffFromCurrent)
            {
                heuristic -= 1.0f;
            }
        }

        //y축
        {
            //현재타일 ~ 목표타일까지 거리
            diffFromCurrent = tileCell.GetTileY() - targetTileCell.GetTileY();
            diffFromCurrent = Mathf.Abs(diffFromCurrent);
            //다음타일 ~ 목표타일까지 거리
            diffFromNext = nextTileCell.GetTileY() - targetTileCell.GetTileY();
            diffFromNext = Mathf.Abs(diffFromNext);

            if (diffFromCurrent < diffFromNext)
            {
                heuristic += 1.0f;
            }
            else if (diffFromNext < diffFromCurrent)
            {
                heuristic -= 1.0f;
            }
        }

        return(heuristic);
    }
Esempio n. 5
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 public bool IsClickedCharacter(TileCell tileCell)
 {
     if (_tileX == tileCell.GetTileX() && _tileY == tileCell.GetTileY())
     {
         return(true);
     }
     return(false);
 }
Esempio n. 6
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    public void SetTargetTileCell(TileCell targetTileCell)
    {
        _targetTileCell = targetTileCell;

        if (_targetTileCell.GetTileX() != this.GetTileX() && _targetTileCell.GetTileY() != this.GetTileY())
        {
            SetPathFindingType(ePathFindingType.ASTAR);
        }
    }
Esempio n. 7
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    public HashSet <MapObject> FindObjectsByRange(eMapObjectType type, eTileLayer layer, TileCell center, int range = 1)
    {
        int minX = center.GetTileX() - range;
        int minY = center.GetTileY() - range;
        int maxX = center.GetTileX() + range;
        int maxY = center.GetTileY() + range;

        if (minX < 0)
        {
            minX = 0;
        }
        if (minY < 0)
        {
            minY = 0;
        }
        if (_width <= maxX)
        {
            maxX = _width;
        }
        if (_height <= maxY)
        {
            maxY = _height;
        }

        HashSet <MapObject> mapObjects = new HashSet <MapObject>();

        for (int y = minY; y <= maxY; y++)
        {
            for (int x = minX; x <= maxX; x++)
            {
                var mapObject = GetTileCell(x, y)?.FindObjectByType(type, layer);
                if (null != mapObject)
                {
                    mapObjects.Add(mapObject);
                }
            }
        }

        if (0 == mapObjects.Count)
        {
            return(null);
        }
        return(mapObjects);
    }
    float CalcComplexHeuristic(TileCell nextTileCell, TileCell targetTileCell)
    {
        int distanceW = nextTileCell.GetTileX() - targetTileCell.GetTileX();
        int distanceH = nextTileCell.GetTileY() - targetTileCell.GetTileY();

        distanceW = distanceW * distanceW;
        distanceH = distanceH * distanceH;

        return((float)(distanceW + distanceH));
    }
Esempio n. 9
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    float CalcEuclideanDistance(TileCell tileCell, TileCell targetCell)
    {
        int distanceW = targetCell.GetTileX() - tileCell.GetTileX();
        int distanceH = targetCell.GetTileY() - tileCell.GetTileY();

        distanceW *= distanceW;
        distanceH *= distanceH;

        return(Mathf.Sqrt(distanceW + distanceH));
    }
Esempio n. 10
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    public override void Update()
    {
        if (false == _character.IsEmptyPathfindingTileCell())
        {
            if (_moveDuration < _moveSpeed)
            {
                _moveDuration += Time.deltaTime;
                return;
            }
            _moveDuration = 0.0f;

            TileCell tileCell = _character.PopPathfindingTileCell();

            sPosition curPosition;
            curPosition.x = _character.GetTileX();
            curPosition.y = _character.GetTileY();

            sPosition toPosition;
            toPosition.x = tileCell.GetTileX();
            toPosition.y = tileCell.GetTileY();

            eMoveDirection direction = GetDirection(toPosition, curPosition);
            _character.SetNextDirection(direction);

            if (false == _character.MoveStart(tileCell.GetTileX(), tileCell.GetTileY()))
            {
                if (_character.IsAttackable())
                {
                    _nextState = eStateType.ATTACK;
                }
                else
                {
                    _nextState = eStateType.IDLE;
                }
            }
        }
        else
        {
            _nextState = eStateType.IDLE;
        }
    }
    float CalcComplexHeuristic(TileCell nextTileCell, TileCell targetTileCell)
    {
        int deltaX = nextTileCell.GetTileX() - targetTileCell.GetTileX();

        deltaX = deltaX * deltaX;

        int deltaY = nextTileCell.GetTileY() - targetTileCell.GetTileY();

        deltaY = deltaY * deltaY;

        return((float)(deltaX + deltaY));
    }
    float CalcSimpleHeuristic(TileCell tileCell, TileCell nextTileCell, TileCell targetTileCell)
    {
        float heuristic  = 0.0f;
        int   deltaTileX = tileCell.GetTileX() - targetTileCell.GetTileX();

        deltaTileX = Mathf.Abs(deltaTileX);
        int nextDeltaTileX = nextTileCell.GetTileX() - targetTileCell.GetTileX();

        nextDeltaTileX = Mathf.Abs(nextDeltaTileX);

        if (deltaTileX < nextDeltaTileX)
        {
            heuristic += 1.0f;
        }
        else if (deltaTileX > nextDeltaTileX)
        {
            heuristic -= 1.0f;
        }

        int deltaTileY = tileCell.GetTileY() - targetTileCell.GetTileY();

        deltaTileY = Mathf.Abs(deltaTileY);
        int nextDeltaTileY = nextTileCell.GetTileY() - targetTileCell.GetTileY();

        nextDeltaTileY = Mathf.Abs(nextDeltaTileY);

        if (deltaTileY < nextDeltaTileY)
        {
            heuristic += 1.0f;
        }
        else if (deltaTileY > nextDeltaTileY)
        {
            heuristic -= 1.0f;
        }

        return(heuristic);
    }
Esempio n. 13
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    public List <MapObject> GetCollisionList(TileCell tileCell)
    {
        int tileX = tileCell.GetTileX();
        int tileY = tileCell.GetTileY();

        if (tileX < 0 || _width <= tileX)
        {
            return(null);
        }
        if (tileY < 0 || _height <= tileY)
        {
            return(null);
        }
        return(tileCell.GetCollisionList());
    }
Esempio n. 14
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    void UpdateMove()
    {
        if (_character.IsMovePossible())
        {
            _eMoveState = eMoveState.END;
        }
        switch (_eMoveState)
        {
        case eMoveState.START:
            if (0 != _pathfindingStack.Count)
            {
                _nextTileCell = _pathfindingStack.Pop();
                sPosition curPosition;
                curPosition.x = _character.GetTileX();
                curPosition.y = _character.GetTileY();

                sPosition toPosition;
                toPosition.x = _nextTileCell.GetTileX();
                toPosition.y = _nextTileCell.GetTileY();

                _direction = _character.GetDirection(curPosition, toPosition);
                _character.SetAnimation(_direction.ToString().ToLower());
            }
            else
            {
                //상태 변경
                MoveFinish();
                return;
            }
            _eMoveState = eMoveState.MOVE;
            break;

        case eMoveState.MOVE:
            MoveInterpolation();      //보간
            break;

        case eMoveState.END:
            _character.MoveTileCell(_nextTileCell);
            _characterVector = _character.GetPosition();
            _eMoveState      = eMoveState.START;
            break;

        default:
            break;
        }
    }
    void MoveAction()
    {
        TileCell targetCell = _character.GetTargetTileCell();

        if (null == targetCell)
        {
            return;
        }

        if (!(targetCell.GetTileX() == _character.GetTileX() &&
              targetCell.GetTileY() == _character.GetTileY()))
        {
            if (_rangeViewer.CheckRange(targetCell))
            {
                _nextState = eStateType.PATHFINDING;
            }
        }
    }
    public override void Update()
    {
        base.Update();

        if (_character.GetMoveSpeed() <= _movingDuration)
        {
            _movingDuration = 0.0f;
            if (0 != _pathTileCellStack.Count)
            {
                TileCell tileCell = _pathTileCellStack.Pop();

                sPosition curPosition;
                curPosition.x = _character.GetTileX();
                curPosition.y = _character.GetTileY();

                sPosition nextPosition;
                nextPosition.x = tileCell.GetTileX();
                nextPosition.y = tileCell.GetTileY();

                eMoveDirection direction = GlobalUtility.GetDirection(curPosition, nextPosition);
                _character.SetNextDirection(direction);

                if (GameManager.Instance.GetMap().CanMoveTile(nextPosition.x, nextPosition.y))
                {
                    _character.MoveStart(nextPosition.x, nextPosition.y);
                }
                else
                {
                    _nextState = eStateType.IDLE;
                }
            }
            else
            {
                _nextState = eStateType.IDLE;
            }
        }
        else
        {
            _movingDuration += Time.deltaTime;
        }
    }
Esempio n. 17
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    void FindPath()
    {
        TileSystem tileSystem = TileSystem.Instance;

        while (0 != _pathfindingQueue.Count)
        {
            //제일 앞 타일을 하나 꺼낸다.
            sPathCommand command = _pathfindingQueue[0];
            _pathfindingQueue.RemoveAt(0);

            //방문한 타일인가?
            if (false == command.tileCell.IsVisit())
            {
                command.tileCell.Visit();

                if (_targetTileCell.GetTilePosition().Equals(command.tileCell.GetTilePosition()))
                {
                    _reverseTileCell = _targetTileCell;
                    return;
                }

                for (int direction = 0; direction < (int)eDirection.MAX; direction++)
                {
                    sTilePosition nextTilePos = new sTilePosition(command.tileCell.GetTileX(), command.tileCell.GetTileY());
                    TileHelper.GetNextTilePosByDirection((eDirection)direction, ref nextTilePos);
                    TileCell nextTileCell = tileSystem.GetTileCell(nextTilePos);

                    if (((true == tileSystem.CanMoveTileCell(nextTilePos.tileX, nextTilePos.tileY)) && false == nextTileCell.IsVisit()) ||
                        (nextTilePos.tileX == _targetTileCell.GetTileX() && nextTilePos.tileY == _targetTileCell.GetTileY()))
                    {
                        float newDistanceFromStart = command.tileCell.GetDistanceFromStart() + command.tileCell.GetDistanceWeight();
                        float newHeuristic         = CalcAstarHeuristic(newDistanceFromStart, nextTileCell, _targetTileCell);

                        if (null == nextTileCell.GetPrevCell())
                        {
                            nextTileCell.SetDistanceFromStart(newDistanceFromStart);
                            nextTileCell.SetPrevCell(command.tileCell);                                 //이전 타일 기억

                            sPathCommand newCommand = new sPathCommand();
                            newCommand.heuristic = newHeuristic;
                            newCommand.tileCell  = nextTileCell;
                            PushCommand(newCommand);
                        }
                    }
                }
            }
        }
    }
    public void FindPath(eFindMode mode, eFindMethod method)
    {
        bool isViewRange = (eFindMode.VIEW_MOVERANGE == mode || eFindMode.VIEW_ATTACKRANGE == mode);

        while (0 != _pathfindingQueue.Count)
        {
            sPathCommand command = _pathfindingQueue[0];
            _pathfindingQueue.RemoveAt(0);

            if (false == command.tileCell.IsVisit())
            {
                command.tileCell.Visit();

                //FIND TARGET
                if (eFindMode.FIND_PATH == mode)
                {
                    if ((_targetTileCell.GetTileX() == command.tileCell.GetTileX()) &&
                        (_targetTileCell.GetTileY() == command.tileCell.GetTileY()))
                    {
                        _reverseTileCell = _targetTileCell;
                        return;
                    }
                }


                for (eMoveDirection direction = 0; direction <= eMoveDirection.DOWN; direction++)
                {
                    sPosition curPosition;
                    curPosition.x = command.tileCell.GetTileX();
                    curPosition.y = command.tileCell.GetTileY();
                    sPosition nextPosition = GlobalUtility.GetPositionByDirection(curPosition, direction);

                    TileMap  map          = GameManager.Instance.GetMap();
                    TileCell nextTileCell = map.GetTileCell(nextPosition.x, nextPosition.y);

                    if (CheckPrecondition(mode, nextTileCell, _targetTileCell))
                    {
                        float distanceFromStart = command.tileCell.GetDistanceFromStart()
                                                  + command.tileCell.GetDistanceWeight();
                        float heuristic = CalcHeuristic(method, distanceFromStart,
                                                        command.tileCell, nextTileCell, _targetTileCell);

                        if (isViewRange && (_range < distanceFromStart))
                        {
                            return;
                        }

                        if (null == nextTileCell.GetPrevTileCell())
                        {
                            nextTileCell.SetDistanceFromStart(distanceFromStart);
                            nextTileCell.SetPrevTileCell(command.tileCell);

                            sPathCommand newCommand;
                            newCommand.tileCell  = nextTileCell;
                            newCommand.heuristic = heuristic;
                            PushCommand(newCommand);

                            //검색범위를 그려준다.
                            if (isViewRange)
                            {
                                DrawSearchTile(nextTileCell);
                            }
                        }
                    }
                }
            }
        }
    }
Esempio n. 19
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    float CalcSimpleHeuristic(TileCell tileCell, TileCell nextTileCell, TileCell goalTileCell)
    {
        float heuristic = 0.0f;

        int diffFromCurrent = 0;
        int diffFromNext    = 0;

        // x 축
        {
            // 현재 타일부터 목표 까지의 거리
            diffFromCurrent = tileCell.GetTileX() - _goalTileCell.GetTileX();
            if (diffFromCurrent < 0)
            {
                diffFromCurrent = -diffFromCurrent;
            }

            // 검사할 타일부터 목표까지의 거리
            diffFromNext = nextTileCell.GetTileX() - _goalTileCell.GetTileX();
            if (diffFromNext < 0)
            {
                diffFromNext = -diffFromNext;
            }

            if (diffFromCurrent < diffFromNext)
            {
                heuristic += 1.0f;
            }
            else if (diffFromNext < diffFromCurrent)
            {
                heuristic -= 1.0f;
            }
        }

        // y 축
        {
            // 현재 타일부터 목표 까지의 거리
            diffFromCurrent = tileCell.GetTileY() - _goalTileCell.GetTileY();
            if (diffFromCurrent < 0)
            {
                diffFromCurrent = -diffFromCurrent;
            }

            // 검사할 타일부터 목표까지의 거리
            diffFromNext = nextTileCell.GetTileY() - _goalTileCell.GetTileY();
            if (diffFromNext < 0)
            {
                diffFromNext = -diffFromNext;
            }

            if (diffFromCurrent < diffFromNext)
            {
                heuristic += 1.0f;
            }
            else if (diffFromNext < diffFromCurrent)
            {
                heuristic -= 1.0f;
            }
        }

        return(heuristic);
    }
    public void UpdatePathFinding()
    {
        if (_pathFindingQueue.Count != 0)
        {
            sPathCommand command = PopCommand();

            if (command.tileCell.Marked() == false)
            {
                command.tileCell.Mark();
                if (command.tileCell.CanMove() == true)
                {
                    command.tileCell.SetPathFindingTestMark(Color.blue);
                }

                else if (command.tileCell.CanMove() == false)
                {
                    command.tileCell.SetPathFindingTestMark(Color.red);
                }

                if (command.tileCell.GetDistanceFromStart() > 5)
                {
                    _reverseTileCell = command.tileCell;
                    _updateState     = eUpdateState.BUILD;
                    return;
                }

                // 목표 도달?
                if (command.tileCell.GetTileX() == _targetTileCell.GetTileX() && command.tileCell.GetTileY() == _targetTileCell.GetTileY())
                {
                    _updateState     = eUpdateState.BUILD;
                    _reverseTileCell = _targetTileCell;
                    return;
                }
                // 주변 타일 검사
                for (int direction = (int)eMoveDirection.UP; direction < (int)eMoveDirection.NONE; direction++)
                {
                    sPosition currentTilePosition;
                    currentTilePosition.x = command.tileCell.GetTileX();
                    currentTilePosition.y = command.tileCell.GetTileY();

                    sPosition nextTilePos = GetPositionByDirection(currentTilePosition, (eMoveDirection)direction);

                    TileCell nextTileCell = GameManager.Instance.GetMap().GetTileCell(nextTilePos.x, nextTilePos.y);

                    //nextTileCell.SetPathFindingTestMark(Color.red);


                    // 검사 한타일인지 && 이동 가능한 타일 인지 && 갈수 없는 노드의 타입이 혹시 몬스터? -> 리팩토링하고싶다ㅏㅏ
                    if ((nextTileCell.IsPathFindable() == true && nextTileCell.Marked() == false))
                    {
                        float distanceFromStart = command.tileCell.GetDistanceFromStart() + command.tileCell.GetDistanceWeight() + 1;
                        //float heuristic = CalcAStarHeuristic(distanceFromStart, nextTileCell, _targetTileCell);
                        float heuristic = 0;

                        switch (_character.GetPathFindingType())
                        {
                        case ePathFindingType.DISTANCE:
                            heuristic = distanceFromStart;
                            break;

                        case ePathFindingType.SIMPLE:
                            heuristic = CalcSimpleHeuristic(command.tileCell, nextTileCell, _targetTileCell);
                            break;

                        case ePathFindingType.COMPLEX:
                            heuristic = CalcComplexHeuristic(nextTileCell, _targetTileCell);
                            break;

                        case ePathFindingType.ASTAR:
                            heuristic = CalcAStarHeuristic(distanceFromStart, nextTileCell, _targetTileCell);
                            break;
                        }

                        if (nextTileCell.GetPrevTileCell() == null)
                        {
                            nextTileCell.SetDistanceFromStart(distanceFromStart);
                            nextTileCell.SetPrevTileCell(command.tileCell);

                            sPathCommand newCommand;
                            newCommand.heuristic = heuristic;
                            newCommand.tileCell  = nextTileCell;
                            PushCommand(newCommand);
                        }
                    }
                }
            }
        }
    }
Esempio n. 21
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    protected void UpdatePathfinding()
    {
        // 길찾기 알고리즘이 시작
        if (0 != _pathfindingQueue.Count)
        {
            sPathCommand command = _pathfindingQueue[0];
            _pathfindingQueue.RemoveAt(0);
            if (false == command.tileCell.IsPathfided())
            {
                command.tileCell.Pathfinded();

                // 목표에 도달 했나?
                if (command.tileCell.GetTileX() == _goalTileCell.GetTileX() &&
                    command.tileCell.GetTileY() == _goalTileCell.GetTileY())
                {
                    _reverseTileCell = command.tileCell;
                    _updateState     = eUpdateState.BUILD_PATH;
                    return;
                }

                for (int direction = (int)eMoveDirection.LEFT;
                     direction < (int)eMoveDirection.DOWN + 1; direction++)
                {
                    sPosition curPosition;
                    curPosition.x = command.tileCell.GetTileX();
                    curPosition.y = command.tileCell.GetTileY();
                    sPosition nextPosition = GetPositionByDirection(curPosition, (eMoveDirection)direction);

                    TileCell searchTileCell =
                        GameManager.Instance.GetMap().GetTileCell(nextPosition.x, nextPosition.y);
                    if (null != searchTileCell && searchTileCell.IsPathfindable() && false == searchTileCell.IsPathfided())
                    {
                        float distance = command.tileCell.GetDistanceFromStart() +
                                         searchTileCell.GetDistanceWeight();

                        if (null == searchTileCell.GetPrevPathfindingCell())
                        {
                            searchTileCell.SetDistanceFromStart(distance);
                            searchTileCell.SetPrevPathfindingCell(command.tileCell);
                            searchTileCell.SetPathfindingTestMark();

                            sPathCommand newCommand;
                            newCommand.tileCell = searchTileCell;

                            /*
                             * newCommand.heuristic = CalcSimpleHeuristic(
                             *                              command.tileCell,
                             *                              searchTileCell,
                             *                              _goalTileCell);
                             */
                            newCommand.heuristic = CalcAStarHeuristic(distance,
                                                                      searchTileCell,
                                                                      _goalTileCell);
                            PushCommand(newCommand);
                        }
                        else
                        {
                            if (distance < searchTileCell.GetDistanceFromStart())
                            {
                                searchTileCell.SetDistanceFromStart(distance);
                                searchTileCell.SetPrevPathfindingCell(command.tileCell);

                                sPathCommand newCommand;
                                newCommand.tileCell = searchTileCell;

                                /*
                                 * newCommand.heuristic = CalcSimpleHeuristic(
                                 *                                  command.tileCell,
                                 *                                  searchTileCell,
                                 *                                  _goalTileCell);
                                 */
                                newCommand.heuristic = CalcAStarHeuristic(distance,
                                                                          searchTileCell,
                                                                          _goalTileCell);
                                PushCommand(newCommand);
                            }
                        }
                    }
                }
            }
        }
    }
Esempio n. 22
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    //타일좌표 뺀 값을 방향벡터로 변환
    public static Vector2Int GetDirectionVector(TileCell from, TileCell to)
    {
        int x = to.GetTileX() - from.GetTileX();
        int y = to.GetTileY() - from.GetTileY();

        if (x > 1)
        {
            x = 1;
        }
        if (x < -1)
        {
            x = -1;
        }
        if (y > 1)
        {
            y = 1;
        }
        if (y < -1)
        {
            y = -1;
        }

        Vector2Int direction = Vector2Int.zero;

        if (x == 1 && y == 1)                   //NORTH(0,1)
        {
            direction.x = 0;
            direction.y = 1;
        }
        else if (x == -1 && y == -1)        //SOUTH(0,-1)
        {
            direction.x = 0;
            direction.y = -1;
        }
        else if (x == 1 && y == -1)         //EAST(1,0)
        {
            direction.x = 1;
            direction.y = 0;
        }
        else if (x == -1 && y == 1)          //WEST(-1,0)
        {
            direction.x = -1;
            direction.y = 0;
        }
        else if (x == 1 && y == 0)          //NORTH_EAST(1,1)
        {
            direction.x = 1;
            direction.y = 1;
        }
        else if (x == 0 && y == 1)          //NORTH_WEST(-1,1)
        {
            direction.x = -1;
            direction.y = 1;
        }
        else if (x == 0 && y == -1)          //SOUTH_EAST(1,-1)
        {
            direction.x = 1;
            direction.y = -1;
        }
        else if (x == -1 && y == 0)          //SOUTH_WEST(-1,-1)
        {
            direction.x = -1;
            direction.y = -1;
        }

        return(direction);
    }