/// <summary>
/// A list of board squares that are yielded via the given navigation function.
/// </summary>
private IEnumerable <GameBoardSquareViewModel> NavigateBoard(NavigationFunction navigationFunction, int row, int column)
{
navigationFunction(ref column, ref row);
while (column >= 0 && column <= 7 && row >= 0 && row <= 7)
{
yield return(GetSquare(row, column));
navigationFunction(ref column, ref row);
}
}
/// <summary>
/// Determines whether the given move 'surrounds' any of the opponents pieces.
/// </summary>
private bool MoveSurroundsCounters(int row, int column,
NavigationFunction navigationFunction, BoardSquareState state)
{
int index = 1;
var squares = NavigateBoard(navigationFunction, row, column);
foreach (var square in squares)
{
BoardSquareState currentCellState = square.State;
// the cell that is the immediate neighbour must be of the other colour
if (index == 1)
{
if (currentCellState != InvertState(state))
{
return(false);
}
}
else
{
// if we have reached a cell of the same colour, this is a valid move
if (currentCellState == state)
{
return(true);
}
// if we have reached an empty cell - fail
if (currentCellState == BoardSquareState.EMPTY)
{
return(false);
}
}
index++;
}
return(false);
}
/// <summary>
/// A list of board squares that are yielded via the given navigation function.
/// </summary>
private IEnumerable<GameBoardSquareViewModel> NavigateBoard(NavigationFunction navigationFunction, int row, int column)
{
navigationFunction(ref column, ref row);
while (column >= 0 && column <= 7 && row >= 0 && row <= 7)
{
yield return GetSquare(row, column);
navigationFunction(ref column, ref row);
}
}
/// <summary>
/// Determines whether the given move 'surrounds' any of the opponents pieces.
/// </summary>
private bool MoveSurroundsCounters(int row, int column,
NavigationFunction navigationFunction, BoardSquareState state)
{
int index = 1;
var squares = NavigateBoard(navigationFunction, row, column);
foreach(var square in squares)
{
BoardSquareState currentCellState = square.State;
// the cell that is the immediate neighbour must be of the other colour
if (index == 1)
{
if (currentCellState != InvertState(state))
{
return false;
}
}
else
{
// if we have reached a cell of the same colour, this is a valid move
if (currentCellState == state)
{
return true;
}
// if we have reached an empty cell - fail
if (currentCellState == BoardSquareState.EMPTY)
{
return false;
}
}
index++;
}
return false;
}
