public Connect4Board(Connect4Board oldBoard)
{
cols = oldBoard.GetNrColumns();
rows = oldBoard.GetNrRows();
board = new int[cols, rows];
for (int i = 0; i < cols; i++)
{
for (int j = 0; j < rows; j++)
{
board[i, j] = oldBoard.GetDisc(i, j);
}
}
}
public int CheckForWin(Connect4Board b)
{
int piece;
//Checking vertically
for (int i = 0; i < b.GetNrColumns(); i++)
{
for (int j = 0; j < b.GetNrRows()-3; j++)
{
if ((piece = b.GetDisc(i, j)) != 0)
{
if (piece == b.GetDisc(i, j+1))
{
if (piece == b.GetDisc(i, j+2))
{
if (piece == b.GetDisc(i, j+3)) return piece;
else j += 2;
}
else j += 1;
}
}
}
}
//Checking horizontally
for (int j = 0; j < b.GetNrRows(); j++)
{
for (int i = 0; i < b.GetNrColumns()-3; i++)
{
if ((piece = b.GetDisc(i, j)) != 0)
{
if (piece == b.GetDisc(i+1, j))
{
if (piece == b.GetDisc(i+2, j))
{
if (piece == b.GetDisc(i+3, j)) return piece;
else i += 2;
}
else i += 1;
}
}
}
}
//Checking diagonally
for (int i = 0; i < b.GetNrColumns()-3; i++)
{
for (int j = 0; j < b.GetNrRows()-3; j++)
{
if ((piece = b.GetDisc(i, j)) != 0)
{
if (piece == b.GetDisc(i + 1, j + 1) && piece == b.GetDisc(i + 2, j + 2) && piece == b.GetDisc(i + 3, j + 3)) return piece;
}
if ((piece = b.GetDisc(i+3, j)) != 0)
{
if (piece == b.GetDisc(i + 2, j + 1) && piece == b.GetDisc(i + 1, j + 2) && piece == b.GetDisc(i, j + 3)) return piece;
}
}
}
return 0;
}
public double EvalSingle(Connect4Board b, int i, int j, int iplus, int jplus, int player)
{
int count = 0;
bool opp = false;
for (int x = 0; x < 4; x++)
{
int piece = b.GetDisc(i + iplus * x, j + jplus * x);
if (piece == 3 - player) return 0.0;
else if (piece == player) count++;
}
if (count == 2) return 5.0;
else if (count == 3) return 25.0 + IsGoodTriple(b, i, j, iplus, jplus, player);
else if (count == 4) return 2500.0;
else return 0.0;
}
public double IsGoodTriple(Connect4Board b, int i, int j, int iplus, int jplus, int player)
{
if (iplus == 0) return 0.0; // if vertical, can't be good triple
int maxj = b.GetNrRows() - 1;
if (j == maxj) return 0.0; // if bottom line can't be good triple
int gap = -1;
for (int x = 0; x < 4; x++)
{
int piece = b.GetDisc(i + iplus * x, j + jplus * x);
if (piece == 3 - player) return 0.0; // make sure there's a gap and not another player
if (piece == 0) gap = x; // get position of gap piece
}
if (gap == -1) return 0.0; // making sure nothing went wrong
if (j + jplus * gap + 1 <= maxj && b.GetDisc(i + iplus * gap, j + jplus * gap + 1) == 0) // if piece below is within boundaries and is missing
{
if (j + jplus * gap + 2 <= maxj && b.GetDisc(i + iplus * gap, j + jplus * gap + 2) == 0) return 100.0; // if piece below that is also within boundaries and is missing, return good score
else return 200.0; // else return great score
}
return 0.0; // return nothing otherwise
}
public Connect4Board(Connect4Board oldBoard)
{
for (int i = 0; i < cols; i++)
{
for (int j = 0; j < rows; j++)
{
board[i, j] = oldBoard.GetDisc(i, j);
}
}
}
