override public bool IsValidMove(BoardState board)
{
// First two moves need to be placements.
bool correctPlayerIsActing = (board.GetActivePlayer() == Actor);
bool normalTurn = (board.HistoryMoveStack.Count >= 2);
bool validStartingPosition = (board.IsInside(StartPosition));
if (!correctPlayerIsActing || !normalTurn || !validStartingPosition)
{
return(false);
}
bool actorOwnsStack = (board[StartPosition].Count > 0 && board[StartPosition].Peek().Owner == Actor);
bool stoneLimitObeyed = (NumStonesTaken <= board.BoardSize);
bool enoughStones = (NumStonesTaken <= board[StartPosition].Count);
bool alwaysDroppedStone = (NumStonesDroppedPerField.Min() > 0);
if (!actorOwnsStack || !stoneLimitObeyed || !enoughStones || !alwaysDroppedStone)
{
return(false);
}
// Moving a single capstone in the end can flatten a wall.
bool canFlattenWall = (NumStonesDroppedPerField[NumStonesDroppedPerField.Count - 1] == 1 &&
board[StartPosition].Peek().Type == StoneType.Capstone);
for (int step = 0; step < NumStonesDroppedPerField.Count; ++step)
{
// Moving outside the field?
Vector2Int pos = StartPosition + (step + 1) * MoveDirection.ToVector();
if (!board.IsInside(pos))
{
return(false);
}
// Can place on top?
StoneType top = board[pos].Count > 0 ? board[pos].Peek().Type : StoneType.FlatStone;
bool placeStone = (top == StoneType.FlatStone);
bool flattenStone = (top == StoneType.StandingStone &&
canFlattenWall &&
step == NumStonesDroppedPerField.Count - 1);
if (!placeStone && !flattenStone)
{
return(false);
}
}
return(true);
}
override public bool IsValidMove(BoardState board)
{
bool correctPlayerIsActing = (board.GetActivePlayer() == Actor);
bool emptyField = (board[Position].Count == 0);
bool actorIsOwner = (Stone.Owner == Actor);
// Only on the first move, the opposing players stone may be placed.
if (board.HistoryMoveStack.Count < 2)
{
bool flatStone = (Stone.Type == StoneType.FlatStone);
return(!actorIsOwner && flatStone && emptyField);
}
// Make sure the owner has enough stones to place.
PlayerState ownerState = board.Players[(int)Stone.Owner];
bool enoughStones = Stone.Type == StoneType.Capstone
? (ownerState.NumCapstones > 0)
: (ownerState.NumStones > 0);
return(correctPlayerIsActing && actorIsOwner && emptyField && enoughStones);
}