private void DrawSquare(System.Windows.Forms.PaintEventArgs e, Graphics surface,
BoardLocation boardLocation, int x, int y)
{
//draw bounding black square
surface.DrawRectangle(PenBorder, x, y, 64, 64);
//draw light or dark square background
surface.FillRectangle(
boardLocation.Color() == BoardLocationColor.Light ? LightSquareBrush: DarkSquareBrush,
x + 1,
y + 1,
63, 63);
//draw square as a valid move square
if (MovingPiece != ChessPiece.None)
{
if (IsValidMove(boardLocation))
{
surface.FillRectangle(LegalMoveBrush, x + 1, y + 1, 63, 63);
}
}
//Draw the legend for squares (a-h and 1-8)
if (boardLocation.Column() == 0)
{
surface.DrawString(Convert.ToString((boardLocation.Row() + 1)), Font,
BlackBoardTextbrush, x + 3, y + 25);
}
if (boardLocation.Row() == 0)
{//ascii A=65
surface.DrawString(Convert.ToChar(65 + boardLocation.Column()).ToString(), Font,
BlackBoardTextbrush, x + 27, y + 48);
}
//dont draw piece if its being moved...
if ((MovingPiece != ChessPiece.None) &&
(boardLocation == MovingPieceBoardLocation))
{
return;
}
//draw the icon on the board..
if (Game.Board[boardLocation] != ChessPiece.None)
{
surface.DrawImage(
imageList32.Images[ToImageIndex(boardLocation)],
x + 16, y + 16, 32, 32);
}
}
public static BoardLocation?South(this BoardLocation currentLocation)
{
var val = currentLocation.ToByte() - 1;
//if we hop columns we are out of bounds
if (val / 8 != currentLocation.Column())
{
return(null);
}
return((val >= 0) ? (BoardLocation)val : default(BoardLocation?));
}
public static BoardLocation?North(this BoardLocation currentLocation)
{
var val = currentLocation.ToByte() + 1;
//if we hop columns we are out of bounds
if (val / 8 != currentLocation.Column())
{
return(null);
}
return((val < Constants.BoardSize) ? (BoardLocation)val : default(BoardLocation?));
}
public static BoardLocation?SouthEast(this BoardLocation currentLocation)
{
var val = currentLocation.ToByte() + 7;
//if we are not the next column this is invalid
if ((val / 8) == currentLocation.Column())
{
return(null);
}
return((val < Constants.BoardSize) ? (BoardLocation)val : default(BoardLocation?));
}
public static BoardLocation?SouthWest(this BoardLocation currentLocation)
{
var val = currentLocation.ToByte() - 9;
//if we are not the next column this is invalid
if ((val / 8) + 1 != currentLocation.Column())
{
return(null);
}
return((val >= 0) ? (BoardLocation)val : default(BoardLocation?));
}
public static BoardLocation?NorthWest(this BoardLocation currentLocation)
{
var val = currentLocation.ToByte() - 7;
//if we DONT hop columns we are out of bounds
if (val / 8 == currentLocation.Column())
{
return(null);
}
return((val >= 0) ? (BoardLocation)val : default(BoardLocation?));
}
private bool LastMoveAllowsEnPassantFor(BoardLocation pawnLocation, Direction pawnCaptureDirection)
{
var lastMove = _moveHistory.LastOrDefault();
if (lastMove == null)
{
return(false);
}
var pawnLocationColumn = pawnLocation.Column();
int lastMoveExpectedColumn = 0;
switch (pawnCaptureDirection)
{
case Direction.NorthEast:
case Direction.SouthEast:
lastMoveExpectedColumn = pawnLocationColumn + 1;
break;
case Direction.NorthWest:
case Direction.SouthWest:
lastMoveExpectedColumn = pawnLocationColumn - 1;
break;
}
//If (and ONLY if):
//-: the last move was a pawn move AND
//-: the last move was two spaces AND
//-: we can thus infer it belongs to the opposite player AND
//-: the last move was right next to the given pawn
//-: the last move was in the right column (based on capture direction)
//(Jesus christ almighty this was not easy)
if ((_board.ContainsPawn(lastMove.Destination)) &&
(Math.Abs(lastMove.Destination.ToByte() - lastMove.Source.ToByte()) == 2) &&
(lastMove.Destination.Row() == pawnLocation.Row()) &&
(lastMove.Destination.Column() == lastMoveExpectedColumn))
{
return(true);
}
else
{
return(false);
}
}
public static bool IsOnSameColumnAs(this BoardLocation source, BoardLocation target)
{
return(source.Column() == target.Column());
}
public static BoardLocationColor Color(this BoardLocation boardLocation)
{
return(((boardLocation.ToByte() + boardLocation.Column() % 2) % 2 == 0) ? BoardLocationColor.Dark : BoardLocationColor.Light);
}