/// <summary>
/// Gets the results of moves.
/// </summary>
/// <param name="currentNode">Node of tree representing the previous move.</param>
/// <returns>Map of move results.</returns>
public MoveResult[,] GetMoveResult(GameTreeNode currentNode)
{
if (currentNode == null)
{
MoveResult[,] moveResults = new MoveResult[RulesetInfo.BoardSize.Width, RulesetInfo.BoardSize.Height];
for (int x = 0; x < RulesetInfo.BoardSize.Width; x++)
{
for (int y = 0; y < RulesetInfo.BoardSize.Height; y++)
{
moveResults[x, y] = MoveResult.Legal;
}
}
return(moveResults);
}
lock (RulesetInfo)
{
MoveResult[,] moveResults = new MoveResult[RulesetInfo.BoardSize.Width, RulesetInfo.BoardSize.Height];
GameBoard[] history = currentNode.GetGameBoardHistory().ToArray();
GameBoard boardState = new GameBoard(currentNode.BoardState);
GroupState groupState = new GroupState(currentNode.GroupState, RulesetInfo);
StoneColor player;
if (currentNode.Move.WhoMoves == StoneColor.None)
{
player = StoneColor.White; // TODO (future work) Petr: ensure this is actually appropriate in all such situations (probably isn't)
}
else
{
player = currentNode.Move.WhoMoves.GetOpponentColor();
}
for (int x = 0; x < RulesetInfo.BoardSize.Width; x++)
{
for (int y = 0; y < RulesetInfo.BoardSize.Height; y++)
{
//set Ruleset state
SetRulesetInfo(boardState, groupState);
Position position = new Position(x, y);
Move move = Move.PlaceStone(player, position);
if (IsPositionOccupied(position) == MoveResult.OccupiedPosition)
{
moveResults[x, y] = MoveResult.OccupiedPosition;
}
else
{
//Find captures and remove prisoners
List <int> capturedGroups = CheckPossiblyCapturedGroups(move);
if (capturedGroups.Count != 0)
{
SetRulesetInfo(new GameBoard(currentNode.BoardState), new GroupState(currentNode.GroupState, RulesetInfo));
}
//remove prisoners
foreach (int groupID in capturedGroups)
{
RulesetInfo.GroupState.Groups[groupID].DeleteGroup();
}
// add temporarily a stone to board
RulesetInfo.GroupState.AddTempStoneToBoard(position, player);
//check selfcapture, ko
moveResults[x, y] = CheckSelfCaptureKo(move, history);
// remove added stone
RulesetInfo.GroupState.RemoveTempStoneFromPosition(position);
}
}
}
return(moveResults);
}
}
/// <summary>
/// Verifies the legality of a move. Places the stone on the board. Finds prisoners and remove them.
/// </summary>
/// <param name="currentNode">Node of tree representing the previous move.</param>
/// <param name="moveToMake">Move to check.</param>
/// <returns>Object, which contains: the result of legality check, list of prisoners, the new state of game board, the new state of groups.</returns>
public MoveProcessingResult ProcessMove(GameTreeNode currentNode, Move moveToMake)
{
lock (RulesetInfo)
{
StoneColor player = moveToMake.WhoMoves;
Position position = moveToMake.Coordinates;
GameBoard[] history = new GameBoard[0];
GroupState previousGroupState, currentGroupState;
GameBoard previousBoard, currentBoard;
if (currentNode == null)
{
previousGroupState = new GroupState(RulesetInfo);
currentGroupState = new GroupState(RulesetInfo);
previousBoard = new GameBoard(RulesetInfo.BoardSize);
currentBoard = new GameBoard(RulesetInfo.BoardSize);
}
else
{
history = currentNode.GetGameBoardHistory().ToArray();
//set Ruleset state
previousGroupState = new GroupState(currentNode.GroupState, RulesetInfo);
currentGroupState = new GroupState(currentNode.GroupState, RulesetInfo);
previousBoard = new GameBoard(currentNode.BoardState);
currentBoard = new GameBoard(currentNode.BoardState);
}
SetRulesetInfo(currentBoard, currentGroupState);
MoveProcessingResult processingResult = new MoveProcessingResult
{
Captures = new List <Position>(),
NewBoard = previousBoard,
NewGroupState = previousGroupState
};
//1. step: check intersection
if (moveToMake.Kind == MoveKind.Pass)
{
processingResult.Result = Pass(currentNode);
return(processingResult);
}
else if (IsOutsideTheBoard(position) == MoveResult.OutsideTheBoard)
{
processingResult.Result = MoveResult.OutsideTheBoard;
return(processingResult);
}
else if (IsPositionOccupied(position) == MoveResult.OccupiedPosition)
{
processingResult.Result = MoveResult.OccupiedPosition;
return(processingResult);
}
else
{
//2. step: add stone
RulesetInfo.GroupState.AddStoneToBoard(moveToMake.Coordinates, moveToMake.WhoMoves);
//3. step: find captures and remove prisoners
List <int> capturedGroups = CheckCapturedGroups(moveToMake);
foreach (int groupID in capturedGroups)
{
processingResult.Captures.AddRange(RulesetInfo.GroupState.Groups[groupID].Members);
RulesetInfo.GroupState.Groups[groupID].DeleteGroup();
}
//4. step: check selfcapture, ko
MoveResult r = CheckSelfCaptureKoSuperko(moveToMake, history);
if (r == MoveResult.Legal)
{
RulesetInfo.GroupState.CountLiberties();
processingResult.NewBoard = currentBoard;
processingResult.NewGroupState = currentGroupState;
}
else
{
SetRulesetInfo(previousBoard, previousGroupState);
}
processingResult.Result = r;
return(processingResult);
}
}
}