// Method for switching figures on the board
public Message switchFigures(Figure figure, coord position)
{
Player player = new Player(getFieldFigureColor(position));
Message result = new Message(false, "", "", player);
this.fields [position.x, position.y] = figure;
if (isCheck(player.next()))
{
result.msg = "check";
if (isCheckMate(player.next(), new coord(0, 0)))
{
result.msg = "checkmate";
}
}
return(result);
}
//check if the king will be in check after this move and don't allow it if it is
private bool isCheck(Player player, coord start, coord end)
{
coord king = new coord();
bool noKing = true;
Figure removedObj = new Figure();
bool res = false;
//move the figure to the new position if the new positon is not the same as the old
if (!start.Equals(end))
{
removedObj = this.fields [end.x, end.y];
this.fields [end.x, end.y] = this.fields [start.x, start.y];
this.fields [start.x, start.y] = new Empty();
}
//search for the king on the board
for (int x = 0; x < this.size.x; x++)
{
for (int y = 0; y < this.size.y; y++)
{
if (this.fields [x, y].color == player.ToString() && getFieldFigureName(new coord(x, y)) == "King")
{
king = new coord(x, y);
noKing = false;
}
}
}
//if a king was found, try to move all figures to the position of the king,if that is possibile it means that the king is in check
if (!noKing)
{
for (int x = 0; x < this.size.x && !res; x++)
{
for (int y = 0; y < this.size.y && !res; y++)
{
//if a move is posiblie means the king is checked
if (checkMove(player.next(), new coord(x, y), king))
{
res = true;
}
}
}
}
//revert the move so that the state of the board is the same as at the start of this function
if (!start.Equals(end))
{
this.fields [start.x, start.y] = this.fields [end.x, end.y];
this.fields [end.x, end.y] = removedObj;
}
return(res);
}
// Message for the initial state
public Message initialState()
{
return(new Message(false, "", "", player.next()));
}
// Method that return some message to player,for example if it is under check or under checkmate
public Message Move(Player player, coord start, coord end)
{
Message result = new Message(false, "", "", player);
if (doCastling(player, start, end))
{
return(result);
}
else if (doEnPassant(player, start, end))
{
return(result);
}
else if (checkMove(player, start, end) && !isCheck(player, start, end))
{
if (this.fields [end.x, end.y].GetType().Name != "Empty")
{
this.removedFigures.Add(this.fields [end.x, end.y]);
}
this.fields [end.x, end.y] = this.fields [start.x, start.y];
this.fields [start.x, start.y] = new Empty();
//check if with this move the other player will be in check or even checkmate
if (isCheck(player.next()))
{
result.msg = "check";
if (isCheckMate(player.next(), new coord(0, 0)))
{
result.msg = "checkmate";
}
}
if (this.getFieldFigureName(end) == "Pawn")
{
((Pawn)this.fields [end.x, end.y]).justMoved = true;
}
//remove all justMoved
for (int x = 0; x < this.size.x; x++)
{
for (int y = 0; y < this.size.y; y++)
{
if (this.fields [x, y].color == player.ToString() && getFieldFigureName(new coord(x, y)) == "Pawn")
{
((Pawn)this.fields [x, y]).justMoved = false;
}
}
}
//set moved Pawn's justMoved to true;
if (this.getFieldFigureName(end) == "Pawn" && (start.y + 2 == end.y || start.y - 2 == end.y))
{
((Pawn)this.fields [end.x, end.y]).justMoved = true;
}
if (this.getFieldFigureName(end) == "Pawn" && (end.y == 0 || end.y == 7))
{
result.action = "chooser";
}
this.fields [end.x, end.y].hasMoved = true;
isDraw(player.next(), new coord(0, 0));
return(result);
}
result.error = true;
return(result);
}