private AIBoardNode GetFlippedTile(Move move)
{
CardinalDirection direction = move.EndPosition.Row < move.StartPosition.Row ? (move.EndPosition.Column < move.StartPosition.Column ? CardinalDirection.Northwest : CardinalDirection.Northeast)
: (move.EndPosition.Column < move.StartPosition.Column ? CardinalDirection.Southwest : CardinalDirection.Southeast);
switch (direction)
{
case CardinalDirection.Northwest:
return TileBoard[move.EndPosition.Row, move.EndPosition.Column];
case CardinalDirection.Northeast:
return TileBoard[move.EndPosition.Row, move.EndPosition.Column - 1];
case CardinalDirection.Southwest:
return TileBoard[move.EndPosition.Row - 1, move.EndPosition.Column];
case CardinalDirection.Southeast:
return TileBoard[move.StartPosition.Row, move.StartPosition.Column];
default:
throw new ArgumentOutOfRangeException(move.ToString() + " must be a flipping move!");
}
}
public bool IsValidMove(Move move)
{
bool valid = true;
//is the move in bounds?
if (!IsValidPosition(move.StartPosition.Row, move.StartPosition.Column, PieceType.Peg)
|| !IsValidPosition(move.EndPosition.Row, move.EndPosition.Column, PieceType.Peg))
{
valid = false;
}
//Does the start space have the player's piece?
else if (PegBoard[move.StartPosition.Row, move.StartPosition.Column].Color != move.PlayerColor)
{
valid = false;
}
//Is the end space empty?
else if (PegBoard[move.EndPosition.Row, move.EndPosition.Column].Color != CreeperColor.Empty)
{
valid = false;
}
else
{
if ((Math.Abs(move.StartPosition.Row - move.EndPosition.Row) > 1)
|| (Math.Abs(move.StartPosition.Column - move.EndPosition.Column) > 1)
|| (move.StartPosition.Equals(move.EndPosition)))
{
valid = false;
}
if (Math.Abs(Math.Abs(move.StartPosition.Row - move.EndPosition.Row) - Math.Abs(move.StartPosition.Column - move.EndPosition.Column)) == 2
&& PegBoard[move.StartPosition.Row + ((move.EndPosition.Row - move.StartPosition.Row) / 2), move.StartPosition.Column + ((move.EndPosition.Column - move.StartPosition.Column) / 2)].Color == move.PlayerColor.Opposite())
{
valid = true;
}
else if (move.PlayerColor == CreeperColor.Empty || move.PlayerColor == CreeperColor.Invalid)
{
throw new ArgumentOutOfRangeException(move.ToString());
}
}
return valid;
}