/// <summary>
/// Returns the best position to play based on the 2 opponents.
/// </summary>
/// <param name="board"></param>
/// <param name="actionBoundary"></param>
/// <returns>best position to play</returns>
private static Vector2 GetBestPosition(ref Cell[,] board, ref Boundary actionBoundary)
{
var bestBlack = new ScoreAndPosition();
var bestWhite = new ScoreAndPosition();
var currentBlack = new ScoreAndPosition();
var currentWhite = new ScoreAndPosition();
for (var row = actionBoundary.YMin; row <= actionBoundary.YMax; row++)
{
for (var column = actionBoundary.XMin; column <= actionBoundary.XMax; column++)
{
if (board[row, column].State != State.Free)
{
continue;
}
currentBlack.Position.SetVector2(column, row);
currentWhite.Position.SetVector2(column, row);
GetBestScoreAndPositionFromState(ref currentBlack, ref board, ref actionBoundary, State.Me);
GetBestScoreAndPositionFromState(ref currentWhite, ref board, ref actionBoundary, State.Ennemy);
if (bestBlack.Score < currentBlack.Score)
{
bestBlack.Position.SetVector2(column, row);
bestBlack.Score = currentBlack.Score;
}
if (bestWhite.Score < currentWhite.Score)
{
bestWhite.Position.SetVector2(column, row);
bestWhite.Score = currentWhite.Score;
}
}
}
return((bestBlack.Score > bestWhite.Score ? bestBlack.Position : bestWhite.Position));
}
/// <summary>
/// Affects the score of the current position based on state.
/// </summary>
/// <param name="scoreAndPosition"></param>
/// <param name="board"></param>
/// <param name="actionBoundary"></param>
/// <param name="state"></param>
protected static void GetBestScoreAndPositionFromState(ref ScoreAndPosition scoreAndPosition, ref Cell[,] board,
ref Boundary actionBoundary, State state)
{
int score;
int tmpScore;
// Vertical
score = GetVerticalScore(ref scoreAndPosition.Position, ref board, ref actionBoundary, state);
// Horizontal
tmpScore = GetHorizontalScore(ref scoreAndPosition.Position, ref board, ref actionBoundary, state);
score = (tmpScore > score ? tmpScore : score);
// Top-left to bottom-right
tmpScore = GetTopLeftToRightBottomScore(ref scoreAndPosition.Position, ref board, ref actionBoundary, state);
score = (tmpScore > score ? tmpScore : score);
// Top-right to bottom-left
tmpScore = GetTopRightToLeftBottomScore(ref scoreAndPosition.Position, ref board, ref actionBoundary, state);
score = (tmpScore > score ? tmpScore : score);
scoreAndPosition.Score = score;
}
