// override setposition to handle enpassant
public override void SetPosition(int Position)
{
// call the base
base.SetPosition(Position);
// check to see if this pawn can enpassant-ed
if (Math.Abs(m_nPosition - m_nPrevPosition) == 16)
{
int Row = -1;
int Col = -1;
int Square = -1;
Etc.GetRowColFromSquare(m_nPosition, out Row, out Col);
// check left
Col--;
Etc.GetSquareFromRowCol(Row, Col, out Square);
if (Square >= 0 && m_Type == PType.WhitePawn && GameData.g_CurrentGameState[Square] != null && GameData.g_CurrentGameState[Square].GetPieceType() == PType.BlackPawn)
{
GameData.g_CurrentGameState[Square].AddEnPassantMove(m_nPosition - 8);
}
else if (Square >= 0 && m_Type == PType.BlackPawn && GameData.g_CurrentGameState[Square] != null && GameData.g_CurrentGameState[Square].GetPieceType() == PType.WhitePawn)
{
GameData.g_CurrentGameState[Square].AddEnPassantMove(m_nPosition + 8);
}
// check right
Etc.GetRowColFromSquare(m_nPosition, out Row, out Col);
Col++;
Etc.GetSquareFromRowCol(Row, Col, out Square);
if (Square >= 0 && m_Type == PType.WhitePawn && GameData.g_CurrentGameState[Square] != null && GameData.g_CurrentGameState[Square].GetPieceType() == PType.BlackPawn)
{
GameData.g_CurrentGameState[Square].AddEnPassantMove(m_nPosition - 8);
}
else if (Square >= 0 && m_Type == PType.BlackPawn && GameData.g_CurrentGameState[Square] != null && GameData.g_CurrentGameState[Square].GetPieceType() == PType.WhitePawn)
{
GameData.g_CurrentGameState[Square].AddEnPassantMove(m_nPosition + 8);
}
}
}
//////////////////////////////////////////////////////////////////////////
// Helpers
//////////////////////////////////////////////////////////////////////////
#region Helpers
// updates the squares this piece is attacking
protected override void UpdateAttackingSquares()
{
// initialize
List <int> AttackedSquares = new List <int>();
// clear our list
m_lAttackingSquares.Clear();
// we can use our current row and column number to make sure we only move inside the board
// and can't cheat wraparound
int Row = 0;
int Col = 0;
int CurrentSquare = -1;
// gets row and column number from current square
Etc.GetRowColFromSquare(m_nPosition, out Row, out Col);
// update when white
if (m_Color == PColor.White)
{
#region NORMAL_TAKE
// gets row and column number from current square
Etc.GetRowColFromSquare(m_nPosition, out Row, out Col);
// look to the NW to see if we can capture any pieces
Row++;
Col--;
Etc.GetSquareFromRowCol(Row, Col, out CurrentSquare);
if (CurrentSquare >= 0)
{
AttackedSquares.Add(CurrentSquare);
}
// gets row and column number from current square
Etc.GetRowColFromSquare(m_nPosition, out Row, out Col);
// look to the NW to see if we can capture any pieces
Row++;
Col++;
Etc.GetSquareFromRowCol(Row, Col, out CurrentSquare);
if (CurrentSquare >= 0)
{
AttackedSquares.Add(CurrentSquare);
}
#endregion
#region ENPASSANT
if (m_lEnPassantMoves.Count > 0)
{
for (int i = 0; i < m_lEnPassantMoves.Count; i++)
{
AttackedSquares.Add(m_lEnPassantMoves[i] - 8);
}
}
#endregion
}
// update when black
if (m_Color == PColor.Black)
{
#region NORMAL_TAKE
// gets row and column number from current square
Etc.GetRowColFromSquare(m_nPosition, out Row, out Col);
// look to the SW to see if we can capture any pieces
Row--;
Col--;
Etc.GetSquareFromRowCol(Row, Col, out CurrentSquare);
if (CurrentSquare >= 0)
{
AttackedSquares.Add(CurrentSquare);
}
// gets row and column number from current square
Etc.GetRowColFromSquare(m_nPosition, out Row, out Col);
// look to the SE to see if we can capture any pieces
Row--;
Col++;
Etc.GetSquareFromRowCol(Row, Col, out CurrentSquare);
if (CurrentSquare >= 0)
{
AttackedSquares.Add(CurrentSquare);
}
#endregion
#region ENPASSANT
if (m_lEnPassantMoves.Count > 0)
{
for (int i = 0; i < m_lEnPassantMoves.Count; i++)
{
AttackedSquares.Add(m_lEnPassantMoves[i] + 8);
}
}
#endregion
}
// add these square to the list
m_lAttackingSquares.AddRange(AttackedSquares);
}
// updates the squares this piece could potentially move to
protected override void UpdateValidMoves()
{
// initialize
List <int> ValidMoves = new List <int>();
// clear our list
m_lValidMoves.Clear();
// we can use our current row and column number to make sure we only move inside the board
// and can't cheat wraparound
int Row = 0;
int Col = 0;
int CurrentSquare = -1;
// gets row and column number from current square
Etc.GetRowColFromSquare(m_nPosition, out Row, out Col);
// check for white
if (m_Color == PColor.White)
{
#region STRAIGHT_AHEAD
// move one square ahead
Row++;
Etc.GetSquareFromRowCol(Row, Col, out CurrentSquare);
// add square if not occupied
if (CurrentSquare >= 0 && GameData.g_CurrentGameState[CurrentSquare] == null)
{
m_lValidMoves.Add(CurrentSquare);
// move one square ahead again
Row++;
Etc.GetSquareFromRowCol(Row, Col, out CurrentSquare);
// get row col from current position
Etc.GetRowColFromSquare(m_nPosition, out Row, out Col);
// add square if not occupied
if (Row == 1 && CurrentSquare >= 0 && GameData.g_CurrentGameState[CurrentSquare] == null)
{
m_lValidMoves.Add(CurrentSquare);
}
}
#endregion
#region NORMAL_TAKE
// gets row and column number from current square
Etc.GetRowColFromSquare(m_nPosition, out Row, out Col);
// look to the NW to see if we can capture any pieces
Row++;
Col--;
Etc.GetSquareFromRowCol(Row, Col, out CurrentSquare);
if (CurrentSquare >= 0 &&
GameData.g_CurrentGameState[CurrentSquare] != null &&
GameData.g_CurrentGameState[CurrentSquare].GetColor() == PColor.Black)
{
m_lValidMoves.Add(CurrentSquare);
}
// gets row and column number from current square
Etc.GetRowColFromSquare(m_nPosition, out Row, out Col);
// look to the NW to see if we can capture any pieces
Row++;
Col++;
Etc.GetSquareFromRowCol(Row, Col, out CurrentSquare);
if (CurrentSquare >= 0 &&
GameData.g_CurrentGameState[CurrentSquare] != null &&
GameData.g_CurrentGameState[CurrentSquare].GetColor() == PColor.Black)
{
m_lValidMoves.Add(CurrentSquare);
}
#endregion
}
// check for black
if (m_Color == PColor.Black)
{
#region STRAIGHT_AHEAD
// move one square ahead
Row--;
Etc.GetSquareFromRowCol(Row, Col, out CurrentSquare);
// add square if not occupied
if (CurrentSquare >= 0 && GameData.g_CurrentGameState[CurrentSquare] == null)
{
m_lValidMoves.Add(CurrentSquare);
// move one square ahead again
Row--;
Etc.GetSquareFromRowCol(Row, Col, out CurrentSquare);
// get row col from current position
Etc.GetRowColFromSquare(m_nPosition, out Row, out Col);
// add square if not occupied
if (Row == 6 && CurrentSquare >= 0 && GameData.g_CurrentGameState[CurrentSquare] == null)
{
m_lValidMoves.Add(CurrentSquare);
}
}
#endregion
#region NORMAL_TAKE
// gets row and column number from current square
Etc.GetRowColFromSquare(m_nPosition, out Row, out Col);
// look to the NW to see if we can capture any pieces
Row--;
Col--;
Etc.GetSquareFromRowCol(Row, Col, out CurrentSquare);
if (CurrentSquare >= 0 &&
GameData.g_CurrentGameState[CurrentSquare] != null &&
GameData.g_CurrentGameState[CurrentSquare].GetColor() == PColor.White)
{
m_lValidMoves.Add(CurrentSquare);
}
// gets row and column number from current square
Etc.GetRowColFromSquare(m_nPosition, out Row, out Col);
// look to the NW to see if we can capture any pieces
Row--;
Col++;
Etc.GetSquareFromRowCol(Row, Col, out CurrentSquare);
if (CurrentSquare >= 0 &&
GameData.g_CurrentGameState[CurrentSquare] != null &&
GameData.g_CurrentGameState[CurrentSquare].GetColor() == PColor.White)
{
m_lValidMoves.Add(CurrentSquare);
}
#endregion
}
// if there are moves, add them
m_lValidMoves.AddRange(ValidMoves);
// check to see if enpassant is still valid
if (GameData.g_LastMove.FromSquare != GetPosition() && GameData.g_LastMove.ColorMoved == GetColor())
{
m_lEnPassantMoves.Clear();
}
// add enpassant moves
m_lValidMoves.AddRange(m_lEnPassantMoves);
}
// draws the pieces
private void Chessboard_DrawPieces(PaintEventArgs e)
{
// make sure we have our images
if (!m_bImageFilesLoaded)
{
return;
}
// locals
int square = 0;
RectangleF RectImage;
Image currImage = null;
// iterate through board
for (int r = 0; r < 8; ++r)
{
for (int c = 0; c < 8; ++c)
{
// create new rectangle
RectImage = new RectangleF(c * m_SquareSize, (7 - r) * m_SquareSize, m_SquareSize, m_SquareSize);
// calculate current square we are on
Etc.GetSquareFromRowCol(r, c, out square);
// get piece for this square
if (GameData.g_CurrentGameState[square] != null)
{
PType currVal = GameData.g_CurrentGameState[square].GetPieceType();
// if there is a piece on this square
if (currVal != PType.None)
{
// get appropriate image for this piece
currImage = GetImageForValue(currVal);
// draw image
if (currImage != null)
{
// draw images not currently dragged by player
if (m_bMouseDown && m_SelectedSquare == square)
{
// do not draw this image, we want to draw it later so it overdraws the whole board
}
else
{
// draw image and tag
e.Graphics.DrawImage(currImage, RectImage);
}
}
}
}
}
}
// add offset to current image for mouse dragging
if (m_bMouseDown && m_SelectedSquare >= 0)
{
// get row and coloumn for current square
int r = 0;
int c = 0;
Etc.GetRowColFromSquare(m_SelectedSquare, out r, out c);
// get image on current square
if (GameData.g_CurrentGameState[m_SelectedSquare] != null)
{
PType currVal = GameData.g_CurrentGameState[m_SelectedSquare].GetPieceType();
currImage = GetImageForValue(currVal);
// calculate drawing rectangle
RectImage = new RectangleF((c * m_SquareSize) + m_PieceOffsetX, ((7 - r) * m_SquareSize) + m_PieceOffsetY, m_SquareSize, m_SquareSize);
// draw image
if (currImage != null)
{
e.Graphics.DrawImage(currImage, RectImage);
}
}
}
}
// returns all diagonal moves a piece can make
protected override List <int> CalculateVerticalMoves(int MaxRange)
{
// we can use our current row and column number to make sure we only move inside the board
// and can't cheat wraparound
int Row = 0;
int Col = 0;
int CurrentSquare = -1;
int CurrentRange = 0;
List <int> PotentialMoves = new List <int>();
// if Maxrange = 0, then Maxrange is infinite
if (MaxRange == 0)
{
MaxRange = int.MaxValue;
}
// iterate through all possible move and add them to a prevalidated moves list
// moving W
Etc.GetRowColFromSquare(m_nPosition, out Row, out Col);
do
{
Row--;
if (Etc.GetSquareFromRowCol(Row, Col, out CurrentSquare))
{
// calculate range from current position
CurrentRange = Math.Abs((CurrentSquare - m_nPosition) - 7);
// add this square
PotentialMoves.Add(CurrentSquare);
// do not pursue this line further when another piece is in the way
if (GameData.g_CurrentGameState[CurrentSquare] != null || CurrentRange >= MaxRange)
{
break;
}
}
} while (Col >= 0 && Col <= 7 && Row >= 0 && Row <= 7);
// moving E
Etc.GetRowColFromSquare(m_nPosition, out Row, out Col);
do
{
Row++;
if (Etc.GetSquareFromRowCol(Row, Col, out CurrentSquare))
{
// calculate range from current position
CurrentRange = Math.Abs((CurrentSquare - m_nPosition) - 7);
// add this square
PotentialMoves.Add(CurrentSquare);
// do not pursue this line further when another piece is in the way
if (GameData.g_CurrentGameState[CurrentSquare] != null || CurrentRange >= MaxRange)
{
break;
}
}
} while (Col >= 0 && Col <= 7 && Row >= 0 && Row <= 7);
// return our list
return(PotentialMoves);
}
// returns all potential moves regardless of other pieces
private List <int> CalculateKnightMoves()
{
List <int> PotentialMoves = new List <int>();
int Row = 0;
int Col = 0;
int CurrentSquare = -1;
Etc.GetRowColFromSquare(m_nPosition, out Row, out Col);
Row += 2;
Col += 1;
if (Etc.GetSquareFromRowCol(Row, Col, out CurrentSquare))
{
PotentialMoves.Add(CurrentSquare);
}
Etc.GetRowColFromSquare(m_nPosition, out Row, out Col);
Row += 2;
Col -= 1;
if (Etc.GetSquareFromRowCol(Row, Col, out CurrentSquare))
{
PotentialMoves.Add(CurrentSquare);
}
Etc.GetRowColFromSquare(m_nPosition, out Row, out Col);
Row += 1;
Col += 2;
if (Etc.GetSquareFromRowCol(Row, Col, out CurrentSquare))
{
PotentialMoves.Add(CurrentSquare);
}
Etc.GetRowColFromSquare(m_nPosition, out Row, out Col);
Row += 1;
Col -= 2;
if (Etc.GetSquareFromRowCol(Row, Col, out CurrentSquare))
{
PotentialMoves.Add(CurrentSquare);
}
Etc.GetRowColFromSquare(m_nPosition, out Row, out Col);
Row -= 2;
Col += 1;
if (Etc.GetSquareFromRowCol(Row, Col, out CurrentSquare))
{
PotentialMoves.Add(CurrentSquare);
}
Etc.GetRowColFromSquare(m_nPosition, out Row, out Col);
Row -= 2;
Col -= 1;
if (Etc.GetSquareFromRowCol(Row, Col, out CurrentSquare))
{
PotentialMoves.Add(CurrentSquare);
}
Etc.GetRowColFromSquare(m_nPosition, out Row, out Col);
Row -= 1;
Col += 2;
if (Etc.GetSquareFromRowCol(Row, Col, out CurrentSquare))
{
PotentialMoves.Add(CurrentSquare);
}
Etc.GetRowColFromSquare(m_nPosition, out Row, out Col);
Row -= 1;
Col -= 2;
if (Etc.GetSquareFromRowCol(Row, Col, out CurrentSquare))
{
PotentialMoves.Add(CurrentSquare);
}
return(PotentialMoves);
}