private ScoreAndMove Negamax(SimpleBoard simp, int currentDepth)
{
if (simp.state == SimpleBoard.State.DRAW)
{
return(new ScoreAndMove(0, -1));
}
else if (simp.state == SimpleBoard.State.XWON || simp.state == SimpleBoard.State.OWON)
{
return(new ScoreAndMove(10 - currentDepth, -1));
}
ScoreAndMove worst = new ScoreAndMove(1000, -1);
foreach (int move in simp.GetMoves())
{
simp.MakeMove(move);
ScoreAndMove sam = Negamax(simp, currentDepth + 1);
simp.UnDoMove(move);
sam.score = -sam.score;
if (sam.score < worst.score)
{
worst.score = sam.score;
worst.move = move;
}
}
return(worst);
}
private void Update()
{
if (Input.GetKeyDown(KeyCode.Keypad1))
{
ExecuteMove(0);
}
if (Input.GetKeyDown(KeyCode.Keypad2))
{
ExecuteMove(1);
}
if (Input.GetKeyDown(KeyCode.Keypad3))
{
ExecuteMove(2);
}
if (Input.GetKeyDown(KeyCode.Keypad4))
{
ExecuteMove(3);
}
if (Input.GetKeyDown(KeyCode.Keypad5))
{
ExecuteMove(4);
}
if (Input.GetKeyDown(KeyCode.Keypad6))
{
ExecuteMove(5);
}
if (Input.GetKeyDown(KeyCode.Keypad7))
{
ExecuteMove(6);
}
if (Input.GetKeyDown(KeyCode.Keypad8))
{
ExecuteMove(7);
}
if (Input.GetKeyDown(KeyCode.Keypad9))
{
ExecuteMove(8);
}
if (Input.GetKeyDown(KeyCode.Space) &&
((mainBoard.turn && xIsAi) || (!mainBoard.turn && oIsAi)))
{
if (!mainBoard.IsEnd())
{
ScoreAndMove sam = Negamax(mainBoard, 0);
int move = sam.move;
if (!mainBoard.turn)
{
ChangeSprite(move, o);
currentPlayerImage.GetComponent <Image>().sprite = x;
}
else
{
ChangeSprite(move, x);
currentPlayerImage.GetComponent <Image>().sprite = o;
}
mainBoard.MakeMove(move);
}
else
{
if (mainBoard.state == SimpleBoard.State.DRAW)
{
currentPlayerText.text = "IT IS A DRAW!";
}
else if (mainBoard.state == SimpleBoard.State.XWON)
{
currentPlayerText.text = "X HAS WON!";
}
else if (mainBoard.state == SimpleBoard.State.OWON)
{
currentPlayerText.text = "O HAS WON!";
}
}
}
}
