/// <summary>
/// 内部方法：移动棋子，并更改FEN记录
/// </summary>
/// <param name="piece">被移动的棋子</param>
/// <param name="srcPos">源棋格</param>
/// <param name="tgtPos">目标棋格</param>
private void PieceMoveIn(Piece piece, Enums.ActionCollection actions, Position srcPos, Position tgtPos)
{
switch (piece.PieceType)
{
#region case 王车易位，过路兵，升变
case Enums.PieceType.WhiteKing:
case Enums.PieceType.BlackKing:
{
//TODO:在这里实现王车易位
break;
}
case Enums.PieceType.WhitePawn:
case Enums.PieceType.BlackPawn:
{
//移走被吃的过路兵
if (_piecePawnByEnPassanted != null)
{
if (tgtPos.X == _piecePawnByEnPassanted.Position.X)
{
actions.Add(Enums.Action.EnPassant);
PieceMoveOut(_piecePawnByEnPassanted.Position);
}
}
//TODO:在这里实现“升变”
break;
}
case Enums.PieceType.WhiteQueen:
case Enums.PieceType.WhiteRook:
case Enums.PieceType.WhiteBishop:
case Enums.PieceType.WhiteKnight:
case Enums.PieceType.BlackQueen:
case Enums.PieceType.BlackRook:
case Enums.PieceType.BlackBishop:
case Enums.PieceType.BlackKnight:
case Enums.PieceType.AllKings:
case Enums.PieceType.AllQueens:
case Enums.PieceType.AllRooks:
case Enums.PieceType.AllBishops:
case Enums.PieceType.AllKnights:
case Enums.PieceType.AllPawns:
case Enums.PieceType.All:
case Enums.PieceType.None:
default:
break;
#endregion
}
piece.Position = tgtPos;
this.SetByPosition(srcPos.Dot, '1');
this.SetByPosition(tgtPos.Dot, Enums.FromPieceType(piece.PieceType)[0]);
this.GameSide = Enums.GetOtherGameSide(this.GameSide);
if (this.GameSide == Enums.GameSide.White)
{
this.FullMoveNumber++;
}
this.HalfMoveClock++;
}
/// <summary>
/// 移动指定位置棋格的棋子
/// </summary>
/// <param name="pair">指定的成对的位置,First值为源棋格,Second值是目标棋格</param>
public void PieceMoveIn(PositionPair pair)
{
Enums.ActionCollection actions = new Enums.ActionCollection();
Piece piece;
if (this.TryGetPiece(pair.First.Dot, out piece))
{
//第1步，判断一下过路兵的格子的逻辑
if (piece is PiecePawn)
{
if (pair.First.Y == pair.Second.Y)
{
return;
}
}
actions.Add(Enums.Action.General);
//第2步，判断目标棋格中是否有棋子。
//如果有棋子，更改Action，调用PieceMoveOut方法。
if (this.ContainsPiece(pair.Second.Dot))
{
actions.Add(Enums.Action.Capture);
this.PieceMoveOut(pair.Second);
}
//第3步，调用内部方法PieceMoveIn，移动棋子，并更改FEN记录
this.PieceMoveIn(piece, actions, pair.First, pair.Second);
//第4步，如上一步棋出现过“过路兵”的局面，而现在进行了新的一步棋了，故而取消上一步棋的“过路兵”局面。
if (_piecePawnByEnPassanted != null)
{
_piecePawnByEnPassanted.EnableEnPassanted = false;
_piecePawnByEnPassanted = null;
}
//第5步，判断是否过路兵的局面
if (piece is PiecePawn)
{
#region 过路兵
//成为能被吃过路兵的“兵”
if ((pair.First.Y == 1 && pair.Second.Y == 3) || (pair.First.Y == 6 && pair.Second.Y == 4))
{
char pawnChar;
Position tmpPos = pair.Second.ShiftWest();
if (tmpPos != null)
{
if (this.TryGetPiece(tmpPos.Dot, out pawnChar))
{
Enums.GameSide side = char.IsLower(pawnChar) ? Enums.GameSide.Black : Enums.GameSide.White;
if (this.GameSide == side)
{
_piecePawnByEnPassanted = piece as PiecePawn;
_piecePawnByEnPassanted.EnableEnPassanted = true;
}
}
}
tmpPos = pair.Second.ShiftEast();
if (tmpPos != null)
{
if (this.TryGetPiece(tmpPos.Dot, out pawnChar))
{
Enums.GameSide side = char.IsLower(pawnChar) ? Enums.GameSide.Black : Enums.GameSide.White;
if (this.GameSide == side)
{
_piecePawnByEnPassanted = piece as PiecePawn;
_piecePawnByEnPassanted.EnableEnPassanted = true;
}
}
}
}
else
{
((PiecePawn)piece).EnableEnPassanted = false;
}
#endregion
}
//第6步，移动棋子后，根据移动棋子后的局面生成Action，主要是判断另一战方的“王”是否被将军
actions.Add(this.IsCheckPieceKing(piece));
//第7步，注册棋子移动后事件
OnPieceMoveInEvent(piece, actions, pair);
}
}