public bool isMatchOver(int last_move_row, int last_move_col, bool is_black_to_move)
{
bool result = false;
C4Board.PieceType this_player = C4Board.PieceType.WHITE;
if (is_black_to_move)
{
this_player = C4Board.PieceType.BLACK;
}
if (is4InARowDownwards(last_move_row: last_move_row, last_move_col: last_move_col, this_player: this_player))
{
result = true;
}
if (!result && is4InARowLeftAndRight(last_move_row: last_move_row, last_move_col: last_move_col, this_player: this_player))
{
result = true;
}
if (!result && is4InARowBL_TR(last_move_row: last_move_row, last_move_col: last_move_col, this_player: this_player))
{
result = true;
}
if (!result && is4InARowBR_TL(last_move_row: last_move_row, last_move_col: last_move_col, this_player: this_player))
{
result = true;
}
return(result);
}
//
// Looks to see if there are 4 in a row directly down
//
private bool is4InARowDownwards(int last_move_row, int last_move_col, C4Board.PieceType this_player)
{
bool result = false;
int num_in_line = numSameCountersDown(last_move_col: last_move_col,
last_move_row: last_move_row,
this_player: this_player);
if (num_in_line >= NUM_EXTRA_SQS_NEEDED)
{
// Match over
result = true;
}
return(result);
}
//
// Returns a count of how many consecutive counters there are rightwards
// the same as this piece's colour
//
public int numSameCountersRight(int last_move_row, int last_move_col, C4Board.PieceType this_player)
{
int num_in_line = 0;
for (int col_idx = last_move_col + 1; col_idx < C4Board.NUM_COLS; ++col_idx)
{
if (squares[last_move_row, col_idx] == this_player)
{
num_in_line++;
}
else
{
break;
}
}
return(num_in_line);
}
//
// Returns a count of how many consecutive counters there are leftwards
// the same as this piece's colour
//
public int numSameCountersLeft(int last_move_row, int last_move_col, C4Board.PieceType this_player)
{
int num_in_line = 0;
for (int col_idx = last_move_col - 1; col_idx >= 0; --col_idx)
{
if (squares[last_move_row, col_idx] == this_player)
{
num_in_line++;
}
else
{
break;
}
}
return(num_in_line);
}
//
// Returns a count of how many consecutive counters there are downwards
// the same as this piece's colour
//
public int numSameCountersDown(int last_move_row, int last_move_col, C4Board.PieceType this_player)
{
int num_in_line = 0;
for (int row_idx = last_move_row - 1; row_idx >= 0; --row_idx)
{
if (squares[row_idx, last_move_col] == this_player)
{
num_in_line++;
}
else
{
break;
}
}
return(num_in_line);
}
//
// Looks to see if there are 4 in a row in a line from bottom-right to top-left
//
private bool is4InARowBR_TL(int last_move_row, int last_move_col, C4Board.PieceType this_player)
{
bool result = false;
int num_in_line = numSameCountersBottomRight(last_move_col: last_move_col,
last_move_row: last_move_row,
this_player: this_player);
num_in_line += numSameCountersTopLeft(last_move_col: last_move_col,
last_move_row: last_move_row,
this_player: this_player);
if (num_in_line >= NUM_EXTRA_SQS_NEEDED)
{
// Match over
result = true;
}
return(result);
}
public int numSameCountersBottomLeft(int last_move_row, int last_move_col, C4Board.PieceType this_player)
{
int num_in_line = 0;
int col_idx = last_move_col - 1;
int row_idx = last_move_row - 1;
for (; (col_idx >= 0) && (row_idx >= 0); --col_idx, --row_idx)
{
if (squares[row_idx, last_move_col] == this_player)
{
num_in_line++;
}
else
{
break;
}
}
return(num_in_line);
}
public int numSameCountersTopRight(int last_move_row, int last_move_col, C4Board.PieceType this_player)
{
int num_in_line = 0;
int col_idx = last_move_col + 1;
int row_idx = last_move_row + 1;
for (; (col_idx < C4Board.NUM_COLS) && (row_idx < C4Board.NUM_ROWS); ++col_idx, ++row_idx)
{
if (squares[row_idx, last_move_col] == this_player)
{
num_in_line++;
}
else
{
break;
}
}
return(num_in_line);
}