private void RedrawSquare(ChessSquare targetedSquare)
{
var g = this.CreateGraphics();
var blackSquareBrush = new Pen(DarkSquaresColor).Brush;
var whiteSquareBrush = new Pen(LightSquaresColor).Brush;
var x = (int)targetedSquare.File;
var y = (int)targetedSquare.Rank;
var isWhiteSquare = (((int)targetedSquare.File + (int)targetedSquare.Rank) % 2) != 0;
var square = (BoardDirection == BoardDirection.BlackOnTop ?
new RectangleF(DigitAreaWidth + x * SquareWidth, (7 - y) * SquareHeight, SquareWidth, SquareHeight) :
new RectangleF(DigitAreaWidth + (7 - x) * SquareWidth, (y) * SquareHeight, SquareWidth, SquareHeight));
// Draw square
g.FillRectangle(isWhiteSquare ? whiteSquareBrush : blackSquareBrush, square);
var currentPiece = GetPieceAt(targetedSquare);
if (currentPiece != null)
{
if (DragDropOperation.Origin == null || DragDropOperation.Origin != targetedSquare)
{
g.DrawImage(GetPieceImage(currentPiece), square);
}
}
// Draw borders
var borders = new Rectangle(0, 0, Width - 1, Height - 1);
g.DrawRectangle(new Pen(Color.Black), borders);
g.Flush();
}
public IllegalMoveException(ChessSquare from, ChessSquare to)
{
Message = $"Unable to move from {from.AlgebraicNotation} to {to.AlgebraicNotation}.";
}
internal ChessMove(ChessSquare from, ChessSquare to)
{
this.From = from;
this.To = to;
}
protected override void OnPaint(PaintEventArgs pe)
{
var controlImage = new Bitmap(this.Width, this.Height);
using (Graphics g = Graphics.FromImage(controlImage))
{
var coordinateAreaBrush = new Pen(CoordinateAreaBackColor).Brush;
var darkSquaresBrush = new Pen(DarkSquaresColor).Brush;
var lightSquaresBrush = new Pen(LightSquaresColor).Brush;
// Draw a filled rectangle for digits
g.FillRectangle(coordinateAreaBrush, 0, 0, DigitAreaWidth, this.Height);
// Draw a filled rectangle for letters
g.FillRectangle(coordinateAreaBrush, 0, this.Height - LetterAreaHeight, this.Width, LetterAreaHeight);
// Draw letters
var coordinateFont = new Font(FontFamily.GenericMonospace, 11 + (SquareWidth - MINIMUM_SQUARE_WIDTH) / 4);
for (int i = 0; i < 8; i++)
{
var letter = (BoardDirection == BoardDirection.BlackOnTop ?
((ChessFile)i).ToString() :
((ChessFile)7 - i).ToString());
var characterSize = g.MeasureString(letter, coordinateFont);
var x = DigitAreaWidth + i * SquareWidth + (SquareWidth - characterSize.Width) / 2;
var y = this.Height - LetterAreaHeight + (LetterAreaHeight - characterSize.Height) / 2;
g.DrawString(letter, coordinateFont, DEFAULT_COORDINATE_FORGROUND_BRUSH, x, y);
}
// Draw digits
coordinateFont = new Font(FontFamily.GenericMonospace, 11 + (SquareHeight - MINIMUM_SQUARE_HEGHT) / 4);
for (int i = 0; i < 8; i++)
{
var digit = (BoardDirection == BoardDirection.BlackOnTop ?
(8 - i).ToString() :
(i + 1).ToString());
var characterSize = g.MeasureString(digit, coordinateFont);
var x = (DigitAreaWidth - characterSize.Width) / 2;
var y = i * SquareHeight + (SquareHeight - characterSize.Height) / 2;
g.DrawString(digit, coordinateFont, DEFAULT_COORDINATE_FORGROUND_BRUSH, x, y);
}
// Draw Turn indicator
var turnIndicatorBorder = new Rectangle(0, Height - LetterAreaHeight, DigitAreaWidth, LetterAreaHeight);
var turnIndicatorSquare = new RectangleF(0, Height - LetterAreaHeight, DigitAreaWidth, LetterAreaHeight);
g.FillRectangle(ChessEngine.Turn == ChessColor.White ? lightSquaresBrush : darkSquaresBrush, turnIndicatorSquare);
g.DrawRectangle(new Pen(Color.Black), turnIndicatorBorder);
// Draw cells
bool isLightSquare = true;
for (int x = 0; x < 8; x++)
{
for (int y = 0; y < 8; y++)
{
var square = new RectangleF(DigitAreaWidth + x * SquareWidth, y * SquareHeight, SquareWidth, SquareHeight);
g.FillRectangle(isLightSquare ? lightSquaresBrush : darkSquaresBrush, square);
ChessSquare currentSquare = BoardDirection == BoardDirection.BlackOnTop ?
new ChessSquare((ChessFile)x, (ChessRank)7 - y) :
new ChessSquare((ChessFile)7 - x, (ChessRank)y);
if (currentSquare != DragDropOperation.Origin)
{
ChessPiece currentPiece = ChessEngine.GetPieceAt(currentSquare);
if (currentPiece != null)
{
g.DrawImage(GetPieceImage(currentPiece), square);
}
}
isLightSquare = !isLightSquare;
}
isLightSquare = !isLightSquare;
}
// Draw visual hints
DrawVisualHints(g);
// Draw borders
var borders = new Rectangle(0, 0, Width - 1, Height - 1);
g.DrawRectangle(new Pen(Color.Black), borders);
g.Flush();
}
pe.Graphics.DrawImage(this.Enabled ? controlImage : GrayOutImage(controlImage), new Point(0, 0));
}
/// <summary>
/// Defines the piece at the given position.
/// </summary>
/// <param name="square">Coordinates of the square where to set the piece.</param>
/// <param name="piece">Piece to set.</param>
/// <exception cref="ArgumentNullException">Thrown when <paramref name="piece"/> or <paramref name="square"/> are null.</exception>
public void SetPieceAt(ChessPiece piece, ChessSquare square)
{
ChessEngine.PutPiece(piece, square);
}
/// <summary>
/// Removes the piece on the given square.
/// </summary>
/// <param name="square">Coordinates of the square where to remove the piece.</param>
/// <returns>An instance of the removed piece or null if there was no piece on the square.</returns>
/// <exception cref="ArgumentNullException">Thrown when <paramref name="square"/> is null.</exception>
public ChessPiece RemovePieceAt(ChessSquare square)
{
return(ChessEngine.RemovePieceAt(square));
}
/// <summary>
/// Gets the piece at the given position.
/// </summary>
/// <param name="square">Coordinates of the square where to look at.</param>
/// <returns></returns>
public ChessPiece GetPieceAt(ChessSquare square)
{
return(ChessEngine.GetPieceAt(square));
}
/// <summary>
/// Returns all legal moves for the current position for the given square.
/// </summary>
/// <param name="square">Square for which to compute legal moves.</param>
/// <returns></returns>
/// <exception cref="ArgumentNullException">Thrown when the <paramref name="square"/> is null.</exception>
/// <exception cref="ArgumentException">Thrown when the <paramref name="square"/> is empty.</exception>
public List <ChessMove> GetLegalMoves(ChessSquare square)
{
return(ChessEngine.GetLegalMoves(square));
}
internal DragOperation(ChessPiece selectedPiece, ChessSquare source)
{
DraggedPiece = selectedPiece;
Origin = source;
}
/// <summary>
/// Checks whether a move is valid and give the type of move (normal, capture, promotion).
/// In case the move is a promotion, set the <see cref="ChessMove.PromotedTo"/> property accordingly before to pass the return object to the <see cref="MovePiece(ChessMove)"/> method.
/// </summary>
/// <param name="from">Square the piece move from.</param>
/// <param name="to">Square the piece move to.</param>
/// <returns></returns>
/// <exception cref="ArgumentNullException">Thrown when <paramref name="from"/> or <paramref name="to"/> are null.</exception>
public ChessMove CheckMoveValidity(ChessSquare from, ChessSquare to)
{
return(ChessEngine.GetMoveValidity(from, to));
}