/// <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);
}
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));
}
internal DragOperation(ChessPiece selectedPiece, ChessSquare source)
{
DraggedPiece = selectedPiece;
Origin = source;
}
