private static BoardState.Player NextPlayer(BoardState.Player player)
{
switch (player)
{
case BoardState.Player.Player1:
return(BoardState.Player.Player2);
case BoardState.Player.Player2:
return(BoardState.Player.Player1);
default:
throw new ArgumentException("Invalid player");
}
}
public static GameState Tick(GameState gameState, PlayerInput playerInput)
{
if (playerInput.Player != gameState.NextPlayer)
{
throw new ArgumentException("Attempted to move out-of-turn");
}
BoardState newBoardState = BoardState.MakeMove(gameState.BoardState, playerInput.Player, playerInput.X, playerInput.Y);
BoardState.Player newNextPlayer = NextPlayer(gameState.NextPlayer);
BoardState.Winner newWinner = BoardState.CheckForWinner(newBoardState);
GameState newGameState = new GameState(newBoardState, newNextPlayer, newWinner);
return(newGameState);
}
private static float WinnerToReward(BoardState.Winner winner, BoardState.Player player)
{
switch (winner)
{
case BoardState.Winner.None:
return(0.0f);
case BoardState.Winner.Draw:
return(0.5f);
case BoardState.Winner.Player1:
return((player == BoardState.Player.Player1) ? 1.0f : -1.0f);
case BoardState.Winner.Player2:
return((player == BoardState.Player.Player2) ? 1.0f : -1.0f);
default:
throw new NotImplementedException();
}
}
private static List <PlayerInput> FindAvailableActions(BoardState boardState, BoardState.Player player)
{
List <PlayerInput> availableActions = new List <PlayerInput>();
for (int y = 0; y < boardState.Positions.GetLength(1); y++)
{
for (int x = 0; x < boardState.Positions.GetLength(0); x++)
{
if (boardState.Positions[x, y] == BoardState.Player.None)
{
availableActions.Add(new PlayerInput(player, x, y));
}
}
}
return(availableActions);
}
public PlayerInput(BoardState.Player player, int x, int y)
{
Player = player;
X = x;
Y = y;
}
public GameState(BoardState boardState, BoardState.Player nextPlayer, BoardState.Winner winner)
{
BoardState = boardState;
NextPlayer = nextPlayer;
Winner = winner;
}