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fpchess: Patch from Brian Chalega da Silva, improves the bishop moves
git-svn-id: https://svn.code.sf.net/p/lazarus-ccr/svn@1562 8e941d3f-bd1b-0410-a28a-d453659cc2b4
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sekelsenmat
@ -321,166 +321,61 @@ end;
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function TChessGame.ValidateBishopMove(AFrom, ATo: TPoint): Boolean;
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var
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AttackedSquares : BitBoard;
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i,j : Integer;
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x,y : integer;
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haveCaptured: boolean = false; //already have captured a piece
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willBeACapture : boolean = false;// the movement will be a capture
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validMove : boolean = false; //if the piece in the 'to' square is not of the same color of the player
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mensagem : String;
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begin
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for i:=1 to 8 do // initialize the bitboard of attacked pieces.
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for j:=1 to 8 do
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AttackedSquares[i][j]:= false;
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//////////////////////////////////////UP LEFT///////////////////////////////////
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y := AFrom.y+1;
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x := AFrom.x-1;
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if (x>=1) and (y<=8) then begin
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if (CurrentPlayerIsWhite) then begin
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willBeACapture:= (Board[x][y] in BlackPieces);
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validMove:= not (Board[x][y] in WhitePieces);
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end
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else begin
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willBeACapture:=(Board[x][y] in WhitePieces);
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validMove:=not (Board[x][y] in BlackPieces)
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result :=false;
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//Up left
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if (AFrom.X>ATo.X) and (AFrom.Y<ATo.Y) and (AFrom.X-ATo.X=ATo.Y-AFrom.Y)then
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begin
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i := AFrom.X-1;
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j := AFrom.Y+1;
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while (i>=ATo.X+1) and (j<=ATo.Y-1) do
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begin
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if Board[i][j] <> ctEmpty then Exit;
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i := i - 1;
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j := j + 1;
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end;
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end
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else
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y :=0; // if it is in the border of the board, put 0 in l to skip the while below.
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haveCaptured:=false;
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while ( (x>=1) and (y <= 8) and (validMove) and (not haveCaptured)) do begin
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AttackedSquares[x][y] := true;
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if (willBeACapture) then
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haveCaptured:=true;
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y := y+1;
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x := x-1;
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if (x>=1) and (y<=8) then begin //again to not have an 'out of bounds' error
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if (CurrentPlayerIsWhite) then begin
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willBeACapture:= (Board[x][y] in BlackPieces);
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validMove:= not (Board[x][y] in WhitePieces);
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end
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else begin
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willBeACapture:=(Board[x][y] in WhitePieces);
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validMove:=not (Board[x][y] in BlackPieces)
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exit(True);
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end;
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//Up right
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if (AFrom.X<ATo.X) and (AFrom.Y<ATo.Y) and (ATo.X-AFrom.X=ATo.Y-AFrom.Y) then
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begin
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i := AFrom.X+1;
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j := AFrom.Y+1;
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while (i<=ATo.X-1) and (j<=ATo.Y-1) do
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begin
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if Board[i][j] <> ctEmpty then Exit;
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i := i + 1;
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j := j + 1;
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end;
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exit(True);
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end;
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///////////////////////////////////END UP LEFT//////////////////////////////////
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//////////////////////////////////////UP RIGHT//////////////////////////////////
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y := AFrom.y+1;
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x := AFrom.x+1;
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willBeACapture:=false;
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if (x<=8) and (y<=8) then begin
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if (CurrentPlayerIsWhite) then begin
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willBeACapture:= (Board[x][y] in BlackPieces);
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validMove:= not (Board[x][y] in WhitePieces);
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end
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else begin
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willBeACapture:=(Board[x][y] in WhitePieces);
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validMove:=not (Board[x][y] in BlackPieces)
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//Down left
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if (AFrom.X>ATo.X) and (AFrom.Y>ATo.Y) and (AFrom.X-ATo.X=AFrom.Y-ATo.Y) then
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begin
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i := AFrom.X-1;
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j := AFrom.Y-1;
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while (i>=ATo.X+1) and (j>=ATo.Y+1) do
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begin
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if Board[i][j] <> ctEmpty then Exit;
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i := i - 1;
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j := j - 1;
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end;
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end
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else
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y :=0; // if it is in the border of the board, put 0 in l to skip the while below.
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haveCaptured:=false;
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while ( (x<=8) and (y <= 8) and (validMove) and (not haveCaptured)) do begin
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AttackedSquares[x][y] := true;
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if (willBeACapture) then
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haveCaptured:=true;
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y := y+1;
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x := x+1;
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if (x<=8) and (y<=8) then begin //again to not have an 'out of bounds' error
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if (CurrentPlayerIsWhite) then begin
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willBeACapture:= (Board[x][y] in BlackPieces);
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validMove:= not (Board[x][y] in WhitePieces);
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end
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else begin
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willBeACapture:=(Board[x][y] in WhitePieces);
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validMove:=not (Board[x][y] in BlackPieces)
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exit(True);
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end;
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//Down right
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if (AFrom.X<ATo.X) and (AFrom.Y>ATo.Y) and (ATo.X-AFrom.X=AFrom.Y-ATo.Y)then
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begin
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i := AFrom.X+1;
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j := AFrom.Y-1;
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while (i<=ATo.X-1) and (j>=ATo.Y+1) do
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begin
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if Board[i][j] <> ctEmpty then Exit;
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i := i + 1;
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j := j - 1;
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end;
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exit(True);
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end;
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///////////////////////////////////END UP RIGHT/////////////////////////////////
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//////////////////////////////////////DOWN LEFT/////////////////////////////////
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y := AFrom.y-1;
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x := AFrom.x-1;
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willBeACapture:=false;
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if (x>=1) and (y>=1) then begin
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if (CurrentPlayerIsWhite) then begin
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willBeACapture:= (Board[x][y] in BlackPieces);
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validMove:= not (Board[x][y] in WhitePieces);
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end
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else begin
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willBeACapture:=(Board[x][y] in WhitePieces);
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validMove:=not (Board[x][y] in BlackPieces)
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end;
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end
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else
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y :=0; // if it is in the border of the board, put 0 in l to skip the while below.
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haveCaptured:=false;
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while ( (x>=1) and (y >= 1) and (validMove) and (not haveCaptured)) do begin
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AttackedSquares[x][y] := true;
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if (willBeACapture) then
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haveCaptured:=true;
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y := y-1;
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x := x-1;
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if (x>=1) and (y>=1) then begin //again to not have an 'out of bounds' error
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if (CurrentPlayerIsWhite) then begin
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willBeACapture:= (Board[x][y] in BlackPieces);
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validMove:= not (Board[x][y] in WhitePieces);
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end
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else begin
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willBeACapture:=(Board[x][y] in WhitePieces);
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validMove:=not (Board[x][y] in BlackPieces)
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end;
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end;
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end;
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///////////////////////////////////END DOWN LEFT////////////////////////////////
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//////////////////////////////////////DOWN RIGHT////////////////////////////////
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y := AFrom.y-1;
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x := AFrom.x+1;
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willBeACapture:=false;
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if (x<=8) and (y>=1) then begin
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if (CurrentPlayerIsWhite) then begin
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willBeACapture:= (Board[x][y] in BlackPieces);
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validMove:= not (Board[x][y] in WhitePieces);
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end
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else begin
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willBeACapture:=(Board[x][y] in WhitePieces);
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validMove:=not (Board[x][y] in BlackPieces)
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end;
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end
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else
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y :=0; // if it is in the border of the board, put 0 in l to skip the while below.
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haveCaptured:=false;
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while ( (x<=8) and (y >= 1) and (validMove) and (not haveCaptured)) do begin
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AttackedSquares[x][y] := true;
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if (willBeACapture) then
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haveCaptured:=true;
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y := y-1;
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x := x+1;
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if (x<=8) and (y>=1) then begin //again to not have an 'out of bounds' error
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if (CurrentPlayerIsWhite) then begin
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willBeACapture:= (Board[x][y] in BlackPieces);
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validMove:= not (Board[x][y] in WhitePieces);
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end
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else begin
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willBeACapture:=(Board[x][y] in WhitePieces);
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validMove:=not (Board[x][y] in BlackPieces)
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end;
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end;
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end;
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///////////////////////////////////END DOWN RIGHT///////////////////////////////
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{for i:=1 to 8 do begin //To show the bitboard
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for j:=1 to 8 do
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mensagem := mensagem + BoolToStr(AttackedSquares[i][j],'1','0') + ' ';
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mensagem := mensagem + #13;
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end;
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ShowMessage(mensagem);}
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result := (AttackedSquares[Ato.X][Ato.y]);
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end;
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function TChessGame.ValidateQueenMove(AFrom, ATo: TPoint): Boolean;
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