/// <summary>
/// Make an additional special move from the latest snapshot (Without generating the next snapshot)
/// </summary>
/// <param name="specialRule">The special rule used</param>
/// <param name="position">The specified piece's data</param>
/// <param name="resultPositions">The returning result of positions</param>
/// <returns>
/// TRUE if move is valid.
/// </returns>
private bool AdditionalMove(ChessPieceSpecialRule specialRule, ChessPosition position, out ChessPosition[] resultPositions)
{
resultPositions = null;
if (specialRule == ChessPieceSpecialRule.CastlingLeft || specialRule == ChessPieceSpecialRule.CastlingRight)
{
int xFromCoord = position.coord.x;
int xToCoord = position.coord.x;
if (specialRule == ChessPieceSpecialRule.CastlingLeft)
{
xFromCoord = 0;
xToCoord -= 1;
}
else if (specialRule == ChessPieceSpecialRule.CastlingRight)
{
xFromCoord = ChessSettings.boardSize - 1;
xToCoord += 1;
}
ChessCoordinate rookFromCoord = new ChessCoordinate(xFromCoord, position.coord.y);
ChessCoordinate rookToCoord = new ChessCoordinate(xToCoord, position.coord.y);
return(Move(rookFromCoord, rookToCoord, out resultPositions));
}
return(true);
}
/// <summary>
/// Check whether the special rule is matching for the specific piece
/// </summary>
/// <param name="specialRule">The special rule used</param>
/// <param name="position">The specified piece's data</param>
/// <param name="from">The specified piece's coordinate</param>
/// <param name="to">The destination's coordinate</param>
/// <returns>
/// TRUE if move is valid regarding special rule.
/// </returns>
public bool IsValidSpecialRule(ChessPieceSpecialRule specialRule, ChessPosition position, ChessCoordinate from, ChessCoordinate to)
{
if (specialRule == ChessPieceSpecialRule.None)
{
return(true);
}
// Pawn - Move 2 square when starting from initial position
if (specialRule == ChessPieceSpecialRule.Pawn2Squares)
{
if (position.hasMoved)
{
return(false);
}
return(true);
}
if (specialRule == ChessPieceSpecialRule.CastlingLeft || specialRule == ChessPieceSpecialRule.CastlingRight)
{
if (position.hasMoved)
{
return(false);
}
int xCoord = position.coord.x;
if (specialRule == ChessPieceSpecialRule.CastlingLeft)
{
xCoord = 0;
}
else if (specialRule == ChessPieceSpecialRule.CastlingRight)
{
xCoord = ChessSettings.boardSize - 1;
}
int rookCoord = new ChessCoordinate(xCoord, position.coord.y).ToArrayCoord();
if (!piecesDict.ContainsKey(rookCoord))
{
return(false);
}
if (!piecesDict[rookCoord].Type.IsRook())
{
return(false);
}
if (piecesDict[rookCoord].HasMoved)
{
return(false);
}
return(true);
}
return(false);
}
/// <summary>
/// Check whether it's a valid move for the specified piece
/// </summary>
/// <param name="position">The specified piece's data</param>
/// <param name="from">The specified piece's coordinate</param>
/// <param name="to">The destination's coordinate</param>
/// <param name="specialRule">The special rule used</param>
/// <returns>
/// TRUE if move is valid.
/// </returns>
public bool IsValidMove(ChessPosition position, ChessCoordinate from, ChessCoordinate to, out ChessPieceSpecialRule specialRule)
{
specialRule = ChessPieceSpecialRule.None;
ChessPieceMove[] possibleMoves = profilesDict[position.type].possibleMoves;
for (int i = 0; i < possibleMoves.Length; i++)
{
specialRule = possibleMoves[i].specialRule;
if (!IsValidSpecialRule(possibleMoves[i].specialRule, position, from, to))
{
continue;
}
ChessCoordinate temp = from + possibleMoves[i].move;
int j = 0;
while
(
temp.IsWithinRange() &&
(possibleMoves[i].repeatTimes < 0 || j < possibleMoves[i].repeatTimes)
)
{
if (temp == to)
{
if (possibleMoves[i].pattern == ChessPieceMovePattern.Normal)
{
if (piecesDict.ContainsKey(temp.ToArrayCoord()))
{
if (piecesDict[temp.ToArrayCoord()].Type.IsSameTeamAs(position.type))
{
break;
}
}
return(true);
}
else if (possibleMoves[i].pattern == ChessPieceMovePattern.MoveOnly)
{
if (piecesDict.ContainsKey(temp.ToArrayCoord()))
{
break;
}
return(true);
}
else if (possibleMoves[i].pattern == ChessPieceMovePattern.CaptureOnly)
{
if (!piecesDict.ContainsKey(temp.ToArrayCoord()))
{
break;
}
if (piecesDict[temp.ToArrayCoord()].Type.IsSameTeamAs(position.type))
{
break;
}
return(true);
}
}
else
{
if (piecesDict.ContainsKey(temp.ToArrayCoord()))
{
break;
}
}
temp += possibleMoves[i].move;
j++;
}
}
return(false);
}
/// <summary>
/// Make a move from the latest snapshot (Without generating the next snapshot)
/// </summary>
/// <param name="from">Current position's coordinate</param>
/// <param name="to">Destination position's coordinate</param>
/// <param name="resultPositions">The returning result of positions</param>
/// <returns>
/// TRUE if move is valid.
/// </returns>
private bool Move(ChessCoordinate from, ChessCoordinate to, out ChessPosition[] resultPositions)
{
resultPositions = null;
if (!from.IsWithinRange())
{
Debug.LogWarning("Failed to execute Move.\nReason: (" + from.x + ", " + from.y + ") is not within RANGE.");
return(false);
}
if (!to.IsWithinRange())
{
Debug.LogWarning("Failed to execute Move.\nReason: (" + to.x + ", " + to.y + ") is not within RANGE.");
return(false);
}
if (!piecesDict.ContainsKey(from.ToArrayCoord()))
{
Debug.LogWarning("Failed to execute Move.\nReason: (" + from.x + ", " + from.y + ") is EMPTY.");
return(false);
}
ChessPieceScript selectedPiece = piecesDict[from.ToArrayCoord()];
ChessPieceSpecialRule specialRule = ChessPieceSpecialRule.None;
ChessPosition[] castlingPositions;
if
(
!IsValidMove(selectedPiece.Position, from, to, out specialRule) ||
!AdditionalMove(specialRule, selectedPiece.Position, out castlingPositions)
)
{
Debug.LogWarning("Failed to execute Move.\nReason: " + selectedPiece.Type + " (" + from.x + ", " + from.y + ") --> (" + to.x + ", " + to.y + ") is INVALID.");
return(false);
}
selectedPiece.Coord = to;
selectedPiece.HasMoved = true;
// Pawn Promotion
if (selectedPiece.Type.IsPawn())
{
if
(
selectedPiece.Type == ChessPieceType.WhitePawn &&
selectedPiece.Coord.y == 0
)
{
selectedPiece.Type = ChessPieceType.WhiteQueen;
}
else if
(
selectedPiece.Type == ChessPieceType.BlackPawn &&
selectedPiece.Coord.y == 7
)
{
selectedPiece.Type = ChessPieceType.BlackQueen;
}
}
if (piecesDict.ContainsKey(to.ToArrayCoord()))
{
Destroy(piecesDict[to.ToArrayCoord()].gameObject);
}
piecesDict.Remove(from.ToArrayCoord());
piecesDict.Remove(to.ToArrayCoord());
piecesDict.Add(to.ToArrayCoord(), selectedPiece);
List <ChessPosition> resultPositionsList = new List <ChessPosition>()
{
new ChessPosition(ChessPieceType.None, from),
new ChessPosition(selectedPiece.Type, to)
};
if (castlingPositions != null)
{
for (int i = 0; i < castlingPositions.Length; i++)
{
resultPositionsList.Add(castlingPositions[i]);
}
}
resultPositions = resultPositionsList.ToArray();
Debug.Log("Succeeded to execute Move.\n" + selectedPiece.Type + " (" + from.x + ", " + from.y + ") --> (" + to.x + ", " + to.y + ").");
return(true);
}
