/// <summary>
/// 从当前的位置移动到新位置。
/// 而后，判断该位置中是否有棋子，并根据判断结果更新两个Position集合(可移动"位置"集合,可杀棋"位置"集合)。
/// 并返回是否可以继续移动的判断。
/// </summary>
/// <param name="situation">当前局面</param>
/// <param name="tgtPos">目标位置</param>
/// <param name="moveInPs">可移动"位置"集合</param>
/// <param name="capturePs">可杀棋"位置"集合</param>
/// <param name="enableToMoved">该棋格为空时，是否可以移入，一般是指“兵”，“兵”的斜向的两个棋格对于“兵”来讲能吃子不能移入。</param>
/// <returns>移动到新位置后是否可以继续移动(当目标棋格中无棋子)</returns>
public static bool Shift(
Enums.GameSide side, ISituation situation,
Position tgtPos, Positions moveInPs, Positions capturePs, bool enableToMoved)
{
if (tgtPos == Position.Empty)
{
return(false);
}
char pieceChar;
if (situation.TryGetPiece(tgtPos.Dot, out pieceChar))
{
if (char.IsLower(pieceChar) && side == Enums.GameSide.White)
{
capturePs.Add(tgtPos);
}
if (char.IsUpper(pieceChar) && side == Enums.GameSide.Black)
{
capturePs.Add(tgtPos);
}
return(false);
}
else
{
if (enableToMoved)
{
moveInPs.Add(tgtPos);
return(true);
}
else
{
return(false);
}
}
}
public override void SetEnablePositions(ISituation situation, out Positions enableMovein, out Positions enableCapture)
{
enableMovein = new Positions();
enableCapture = new Positions();
if (this.GameSide == Enums.GameSide.White)
{
#region 白兵
if (this.Position.Y < 1)
{
return; //白兵怎么也不可能在第一行上
}
Position tmpPos = Position.Empty;
//向北
tmpPos = this.Position.ShiftNorth();
if (tmpPos == Position.Empty)
{
return;
}
if (!situation.ContainsPiece(tmpPos.Dot))
{
enableMovein.Add(tmpPos);
}
//再向北(仅当在兵从未动过时)
if (this.Position.Y == 1)
{
tmpPos = tmpPos.ShiftNorth();
if (!situation.ContainsPiece(tmpPos.Dot))
{
enableMovein.Add(tmpPos);
}
}
//吃过路兵的判断
if (this.Position.Y == 4)
{
#region 过路兵
//西北
tmpPos = this.Position.ShiftWest();
if (tmpPos != null)
{
Piece pawn;
Game game = (Game)situation;
if (game.TryGetPiece(tmpPos.Dot, out pawn))
{
if (pawn is PiecePawn)
{
if (((PiecePawn)pawn).EnableEnPassanted)
{
enableMovein.Add(this.Position.ShiftWestNorth());
enableCapture.Add(tmpPos);
}
}
}
}
//东北
tmpPos = this.Position.ShiftEast();
if (tmpPos != null)
{
Piece pawn;
Game game = (Game)situation;
if (game.TryGetPiece(tmpPos.Dot, out pawn))
{
if (pawn is PiecePawn)
{
if (((PiecePawn)pawn).EnableEnPassanted)
{
enableMovein.Add(this.Position.ShiftEastNorth());
enableCapture.Add(tmpPos);
}
}
}
}
#endregion
}
//剑指西北
Position.Shift(this.GameSide, situation, this.Position.ShiftWestNorth(), enableMovein, enableCapture, false);
//剑指东北
Position.Shift(this.GameSide, situation, this.Position.ShiftEastNorth(), enableMovein, enableCapture, false);
#endregion
}
else
{
#region 黑兵
if (this.Position.Y > 6)
{
return;
}
Position tmpPos = Position.Empty;
//向南
tmpPos = this.Position.ShiftSouth();
if (tmpPos == Position.Empty)
{
return;
}
if (!situation.ContainsPiece(tmpPos.Dot))
{
enableMovein.Add(tmpPos);
}
//再向南(仅当在兵从未动过时)
if (this.Position.Y == 6)
{
tmpPos = tmpPos.ShiftSouth();
if (!situation.ContainsPiece(tmpPos.Dot))
{
enableMovein.Add(tmpPos);
}
}
//吃过路兵的判断
if (this.Position.Y == 3)
{
#region 过路兵
//西南
tmpPos = this.Position.ShiftWest();
if (tmpPos != null)
{
Piece pawn;
Game game = (Game)situation;
if (game.TryGetPiece(tmpPos.Dot, out pawn))
{
if (pawn is PiecePawn)
{
if (((PiecePawn)pawn).EnableEnPassanted)
{
enableMovein.Add(this.Position.ShiftWestSouth());
enableCapture.Add(tmpPos);
}
}
}
}
//东南
tmpPos = this.Position.ShiftEast();
if (tmpPos != null)
{
Piece pawn;
Game game = (Game)situation;
if (game.TryGetPiece(tmpPos.Dot, out pawn))
{
if (pawn is PiecePawn)
{
if (((PiecePawn)pawn).EnableEnPassanted)
{
enableMovein.Add(this.Position.ShiftEastSouth());
enableCapture.Add(tmpPos);
}
}
}
}
#endregion
}
//剑指西南
Position.Shift(this.GameSide, situation, this.Position.ShiftWestSouth(), enableMovein, enableCapture, false);
//剑指东南
Position.Shift(this.GameSide, situation, this.Position.ShiftEastSouth(), enableMovein, enableCapture, false);
#endregion
}
}