private IEnumerable <BoardPoint> GetNeighbors(BoardPoint point, GameBoard board)
{
{
var neighbor = point.ShiftLeft();
if (IsAcceptablePath(board, neighbor))
{
yield return(neighbor);
}
}
{
var neighbor = point.ShiftRight();
if (IsAcceptablePath(board, neighbor))
{
yield return(neighbor);
}
}
{
var neighbor = point.ShiftTop();
if (IsAcceptablePath(board, neighbor))
{
yield return(neighbor);
}
}
{
var neighbor = point.ShiftBottom();
if (IsAcceptablePath(board, neighbor))
{
yield return(neighbor);
}
}
}
private static Direction GetDefaultDirection(GameBoard gameBoard, BoardPoint head)
{
if (head == null)
{
return(Direction.Right);
}
if (prevDirection != Direction.Left &&
!strongBadElements.Contains(gameBoard.GetElementAtOrWall(head.ShiftRight())))
{
return(Direction.Right);
}
if (prevDirection != Direction.Down &&
!strongBadElements.Contains(gameBoard.GetElementAtOrWall(head.ShiftTop())))
{
return(Direction.Up);
}
if (prevDirection != Direction.Up &&
!strongBadElements.Contains(gameBoard.GetElementAtOrWall(head.ShiftBottom())))
{
return(Direction.Down);
}
return(Direction.Left);
}
static bool canUp(GameBoard gameBoard, BoardPoint head) => prevDirection != Direction.Down && !badElements.Contains(gameBoard.GetElementAtOrWall(head.ShiftTop()));
static bool isNotDeadEnd2(GameBoard gameBoard, BoardPoint point) => incrementIfNotDeadEnd(gameBoard, point.ShiftRight()) + incrementIfNotDeadEnd(gameBoard, point.ShiftTop()) + incrementIfNotDeadEnd(gameBoard, point.ShiftBottom()) + incrementIfNotDeadEnd(gameBoard, point.ShiftLeft()) > 1;