Actually adding the "check" checking.
This commit is contained in:
parent
47612dc88b
commit
a23ce67434
@ -30,6 +30,7 @@
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#define PEICE_ORIGIN 5u
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#define PEICE_NEEDS_TO_BE_HERE 6u
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#define POTENTIAL_CASTLE 7u
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#define PEICE_NEEDS_TO_BE_REMOVED 8u
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#define GAME_STATE_IDLE 0u
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#define GAME_STATE_P1_TURN_BEGINING 1u
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@ -68,6 +69,7 @@ static uint8_t Taken_Peice = SQUARE_EMPTY;
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static bool Check[2u] = {false, false};
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static uint8_t King_Locations[2u][2u] = {{7,4}, {0,4}};
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static bool Castling_Allowed[2u][2u] = {{true, true}, {true, true}};
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static bool High_Alert = false;
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/**
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* @brief Function for figuring out if the current column is one of the jail columns.
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@ -121,92 +123,23 @@ static bool opposite_teams(uint8_t piece_one, uint8_t piece_two)
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return (((piece_one % 2u) == 0u) ^ ((piece_two % 2u) == 0u));
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}
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/**
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* @brief Function for marking potential moves for pawns.
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* @param row: row to move to
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* @param column: column to move to
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* @retval None
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*/
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static void pawn_move(uint8_t row, uint8_t column)
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{
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if(Board_State[row][column] == SQUARE_EMPTY)
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{
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Board_Lights[row][column] = POTENTIAL_MOVE;
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}
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}
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/**
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* @brief Function for "casting" a ray in any direction, vertical, horizontal, or diagonal. If the ray hits someone from the other team
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* or the end of the board the array will be terminated.
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* @param direction_r: Row direction
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* @param direction_c: Column direction
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* @param row: current row location
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* @param column: current column location
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* @param piece_one: the peice that is casting the ray.
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* @retval None
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*/
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static void cast_a_ray(int8_t direction_r, int8_t direction_c, uint8_t row, uint8_t column, uint8_t piece_one)
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{
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bool loop = true;
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int8_t x = column;
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int8_t y = row;
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while (loop)
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{
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x += direction_c;
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y += direction_r;
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if((x < 0) || (y < 0) || (x >= 8) || (y >= 8))
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{
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loop = false;
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}
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else if (Board_State[x][y] == SQUARE_EMPTY)
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{
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Board_Lights[x][y] = POTENTIAL_MOVE;
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}
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else if (opposite_teams(piece_one, Board_State[x][y]))
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{
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Board_Lights[x][y] = POTENTIAL_TAKE;
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/* once we take a peice we can no longer take anymore */
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loop = false;
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}
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else
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{
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loop = false;
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}
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}
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}
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/**
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* @brief Marking a peice for taking.
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* @param row: Row ofcoarse
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* @param column: Column obviously
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* @retval None
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*/
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static void pawn_take(uint8_t row, uint8_t column)
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{
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if (Board_State[row][column] < SQUARE_EMPTY)
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{
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Board_Lights[row][column] = POTENTIAL_TAKE;
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}
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}
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/**
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* @brief Check to see if the square is safe from the other team.
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* @param column: Column of potential move
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* @param row: Row of the potential move
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* @retval True if the square is safe, else is false
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*/
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bool square_is_safe(uint8_t column, uint8_t row)
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bool square_is_safe(uint8_t row, uint8_t column)
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{
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bool ret_val = true;
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int8_t direction = White_Turn ? -1 : 1;
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/* first check if pawns can take us */
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if ((row >= 1u) && ((White_Turn ? PAWN_BLACK : PAWN_WHITE) == Board_State[column + direction][row - 1u]))
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if ((row >= 1u) && ((White_Turn ? PAWN_BLACK : PAWN_WHITE) == Board_State[row + direction][column - 1u]))
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{
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//can be eaten by a pawn, not safe.
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return false;
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}
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if ((row <= 6u) && ((White_Turn ? PAWN_BLACK : PAWN_WHITE) == Board_State[column + direction][row + 1u]))
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if ((row <= 6u) && ((White_Turn ? PAWN_BLACK : PAWN_WHITE) == Board_State[row + direction][column + 1u]))
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{
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//can be eaten by a pawn, not safe.
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return false;
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@ -221,8 +154,8 @@ bool square_is_safe(uint8_t column, uint8_t row)
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{
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for (int8_t left_right = start_c; left_right <= stop_c; left_right++)
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{
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int8_t x = column + left_right;
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int8_t y = row + up_down;
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int8_t x = row + left_right;
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int8_t y = column + up_down;
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if ((White_Turn ? KING_BLACK : KING_WHITE) == Board_State[x][y])
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{
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return false;
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@ -256,8 +189,8 @@ bool square_is_safe(uint8_t column, uint8_t row)
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}
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/* Rooks and queens */
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bool loop = true;
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int8_t x = column;
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int8_t y = row;
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int8_t x = row;
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int8_t y = column;
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while (loop)
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{
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x += left_right_step;
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@ -306,10 +239,12 @@ bool square_is_safe(uint8_t column, uint8_t row)
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left_right_step = -1;
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}
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bool loop = true;
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int8_t x = column;
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int8_t y = row;
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int8_t x = row;
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int8_t y = column;
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while (loop)
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{
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uint8_t bish = (White_Turn ? BISHOP_BLACK : BISHOP_WHITE);
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uint8_t queen = (White_Turn ? QUEEN_BLACK : QUEEN_WHITE);
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x += left_right_step;
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y += up_down_step;
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if ((x < 0) || (y < 0) || (x >= 8) || (y >= 8))
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@ -320,7 +255,7 @@ bool square_is_safe(uint8_t column, uint8_t row)
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{
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/* do nothing */
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}
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else if (((White_Turn ? BISHOP_BLACK : BISHOP_WHITE) == Board_State[x][y]) || ((White_Turn ? QUEEN_BLACK : QUEEN_WHITE) == Board_State[x][y]))
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else if ((bish == Board_State[x][y]) || (queen == Board_State[x][y]))
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{
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return false;
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}
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@ -367,8 +302,8 @@ bool square_is_safe(uint8_t column, uint8_t row)
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up_down_step = (i == 0u) ? -1 : 1;
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}
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int8_t x = (int8_t)column + left_right_step;
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int8_t y = (int8_t)row + up_down_step;
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int8_t x = (int8_t)row + left_right_step;
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int8_t y = (int8_t)column + up_down_step;
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if ((x >= 0) && (y >= 0) && (x < 8) && (y < 8))
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{
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if ((White_Turn ? KNIGHT_BLACK : KNIGHT_WHITE) == Board_State[x][y])
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@ -381,6 +316,129 @@ bool square_is_safe(uint8_t column, uint8_t row)
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return true;
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}
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bool Check_If_Take_Caused_Check(uint8_t row, uint8_t column)
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{
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bool ret_val;
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uint8_t store_eaten_peice = Board_State[row][column];
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Board_State[row][column] = Selected_Peice;
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//If its the white's turn we want to see if the white king is still safe.
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uint8_t white_black_idx = White_Turn ? 0u : 1u;
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ret_val = !square_is_safe(King_Locations[white_black_idx][0u], King_Locations[white_black_idx][1u]);
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Board_State[row][column] = store_eaten_peice;
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return ret_val;
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}
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bool Check_If_Move_Caused_Check(uint8_t row, uint8_t column)
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{
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bool ret_val;
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Board_State[row][column] = Selected_Peice;
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//If its the white's turn we want to see if the white king is still safe.
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uint8_t white_black_idx = White_Turn ? 0u : 1u;
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ret_val = !square_is_safe(King_Locations[white_black_idx][0u], King_Locations[white_black_idx][1u]);
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Board_State[row][column] = SQUARE_EMPTY;
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return ret_val;
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}
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void Check_If_Could_Cause_Check(uint8_t row, uint8_t column)
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{
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uint8_t temp_storage = Board_State[row][column];
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Board_State[row][column] = SQUARE_EMPTY;
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//If its the white's turn we want to see if the white king is still safe.
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uint8_t white_black_idx = White_Turn ? 0u : 1u;
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High_Alert = !square_is_safe(King_Locations[white_black_idx][0u], King_Locations[white_black_idx][1u]);
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if(High_Alert)
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{
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SDL_Log("High ALERT ENABLED!\n");
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}
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else
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{
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SDL_Log("High ALERT DISABLED!\n");
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}
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Board_State[row][column] = temp_storage;
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}
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/**
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* @brief Function for marking potential moves for pawns.
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* @param row: row to move to
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* @param column: column to move to
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* @retval None
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*/
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static void pawn_move(uint8_t row, uint8_t column)
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{
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if (Board_State[row][column] == SQUARE_EMPTY)
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{
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if ((!High_Alert) || (!Check_If_Move_Caused_Check(row, column)))
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{
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Board_Lights[row][column] = POTENTIAL_MOVE;
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}
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}
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}
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/**
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* @brief Function for "casting" a ray in any direction, vertical, horizontal, or diagonal. If the ray hits someone from the other team
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* or the end of the board the array will be terminated.
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* @param direction_r: Row direction
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* @param direction_c: Column direction
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* @param row: current row location
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* @param column: current column location
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* @param piece_one: the peice that is casting the ray.
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* @retval None
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*/
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static void cast_a_ray(int8_t direction_r, int8_t direction_c, uint8_t column, uint8_t row, uint8_t piece_one)
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{
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bool loop = true;
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int8_t x = row;
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int8_t y = column;
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while (loop)
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{
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x += direction_c;
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y += direction_r;
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if((x < 0) || (y < 0) || (x >= 8) || (y >= 8))
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{
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loop = false;
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}
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else if (Board_State[x][y] == SQUARE_EMPTY)
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{
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if ((!High_Alert) || (!Check_If_Move_Caused_Check(x, y)))
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{
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Board_Lights[x][y] = POTENTIAL_MOVE;
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}
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}
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else if (opposite_teams(piece_one, Board_State[x][y]))
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{
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if ((!High_Alert) || (!Check_If_Take_Caused_Check(x, y)))
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{
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Board_Lights[x][y] = POTENTIAL_TAKE;
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}
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/* once we take a peice we can no longer take anymore */
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loop = false;
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}
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else
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{
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loop = false;
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}
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}
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}
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/**
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* @brief Marking a peice for taking.
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* @param row: Row ofcoarse
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* @param column: Column obviously
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* @retval None
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*/
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static void pawn_take(uint8_t row, uint8_t column)
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{
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if (Board_State[row][column] < SQUARE_EMPTY)
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{
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if ((!High_Alert) || (!Check_If_Take_Caused_Check(row, column)))
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{
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Board_Lights[row][column] = POTENTIAL_TAKE;
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}
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}
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}
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/**
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* @brief Function for marking the potential moves.
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* @param piece: Peice that we are marking the potential moves for.
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@ -388,7 +446,7 @@ bool square_is_safe(uint8_t column, uint8_t row)
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* @param column: Current column location of the peice.
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* @retval None
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*/
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static void Mark_Potential_Moves(uint8_t piece, uint8_t row, uint8_t column)
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static void Mark_Potential_Moves(uint8_t piece, uint8_t column, uint8_t row)
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{
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switch (piece)
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{
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@ -396,23 +454,23 @@ static void Mark_Potential_Moves(uint8_t piece, uint8_t row, uint8_t column)
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case PAWN_BLACK:
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{
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int8_t direction = White_Turn ? -1 : 1;
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if (column == (White_Turn ? 6u : 1u))
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if (row == (White_Turn ? 6u : 1u))
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{
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if(Board_State[column + direction][row] == SQUARE_EMPTY)
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if(Board_State[row + direction][column] == SQUARE_EMPTY)
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{
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pawn_move(column + (direction * 2u), row);
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pawn_move(row + (direction * 2u), column);
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}
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}
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pawn_move(column + direction, row);
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pawn_move(row + direction, column);
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if ((row >= 1u) && opposite_teams(piece, Board_State[column + direction][row - 1u]))
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if ((row >= 1u) && opposite_teams(piece, Board_State[row + direction][column - 1u]))
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{
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pawn_take(column + direction, row - 1u);
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pawn_take(row + direction, column - 1u);
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}
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if ((row <= 6u) && opposite_teams(piece, Board_State[column + direction][row + 1u]))
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if ((row <= 6u) && opposite_teams(piece, Board_State[row + direction][column + 1u]))
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{
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pawn_take(column + direction, row + 1u);
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pawn_take(row + direction, column + 1u);
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}
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break;
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@ -444,7 +502,7 @@ static void Mark_Potential_Moves(uint8_t piece, uint8_t row, uint8_t column)
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up_down_step = 0;
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left_right_step = -1;
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}
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cast_a_ray(up_down_step, left_right_step, row, column, piece);
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cast_a_ray(up_down_step, left_right_step, column, row, piece);
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}
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break;
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@ -488,21 +546,27 @@ static void Mark_Potential_Moves(uint8_t piece, uint8_t row, uint8_t column)
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up_down_step = (i == 0u) ? -1 : 1;
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}
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int8_t x = (int8_t)column + left_right_step;
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int8_t y = (int8_t)row + up_down_step;
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int8_t x = (int8_t)row + left_right_step;
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int8_t y = (int8_t)column + up_down_step;
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if ((x >= 0) && (y >= 0) && (x < 8) && (y < 8))
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{
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if (Board_State[x][y] == SQUARE_EMPTY)
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{
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if ((!High_Alert) || (!Check_If_Move_Caused_Check(x, y)))
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{
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Board_Lights[x][y] = POTENTIAL_MOVE;
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}
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}
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else if (opposite_teams(piece, Board_State[x][y]))
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{
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if ((!High_Alert) || (!Check_If_Take_Caused_Check(x, y)))
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{
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Board_Lights[x][y] = POTENTIAL_TAKE;
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}
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}
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}
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}
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}
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break;
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}
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case BISHOP_WHITE:
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@ -532,20 +596,17 @@ static void Mark_Potential_Moves(uint8_t piece, uint8_t row, uint8_t column)
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up_down_step = 1;
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left_right_step = -1;
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}
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cast_a_ray(up_down_step, left_right_step, row, column, piece);
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cast_a_ray(up_down_step, left_right_step, column, row, piece);
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}
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break;
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}
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case QUEEN_WHITE:
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case QUEEN_BLACK:
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{
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for (int8_t up_down = -1; up_down < 2; up_down++)
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{
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for (int8_t left_rigth = -1; left_rigth < 2; left_rigth++)
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{
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cast_a_ray(up_down, left_rigth, row, column, piece);
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}
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}
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//Mark bishop moves
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Mark_Potential_Moves((piece - 2u), column, row);
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//Mark rook moves
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Mark_Potential_Moves((piece - 6u), column, row);
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break;
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}
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case KING_WHITE:
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@ -555,12 +616,12 @@ static void Mark_Potential_Moves(uint8_t piece, uint8_t row, uint8_t column)
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int8_t stop_r = (row == 7u) ? 0 : 1;
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int8_t start_c = (column == 0u) ? 0 : -1;
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int8_t stop_c = (column == 7u) ? 0 : 1;
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for (int8_t up_down = start_r; up_down <= stop_r; up_down++)
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for (int8_t left_right = start_r; left_right <= stop_r; left_right++)
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{
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for (int8_t left_right = start_c; left_right <= stop_c; left_right++)
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for (int8_t up_down = start_c; up_down <= stop_c; up_down++)
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{
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int8_t x = column + left_right;
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int8_t y = row + up_down;
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int8_t x = row + left_right;
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int8_t y = column + up_down;
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if (square_is_safe(x, y))
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{
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if (Board_State[x][y] == SQUARE_EMPTY)
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@ -578,23 +639,32 @@ static void Mark_Potential_Moves(uint8_t piece, uint8_t row, uint8_t column)
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uint8_t kings_row = White_Turn ? 7u : 0u;
|
||||
|
||||
//Can only castle if not currently in check
|
||||
if(square_is_safe(column, row))
|
||||
if (square_is_safe(row, column))
|
||||
{
|
||||
// Queen side castle
|
||||
if(Castling_Allowed[white_black_idx][0u] && (Board_State[kings_row][1u] == SQUARE_EMPTY)
|
||||
&& (Board_State[kings_row][2u] == SQUARE_EMPTY) && (Board_State[kings_row][3u]) == SQUARE_EMPTY)
|
||||
{
|
||||
Board_Lights[kings_row][2u] = POTENTIAL_MOVE;
|
||||
//First Check to see if the king will pass through check
|
||||
if(square_is_safe(kings_row, 3u) && square_is_safe(kings_row, 2u))
|
||||
{
|
||||
// Yay we can castle queen side!
|
||||
Board_Lights[kings_row][2u] = POTENTIAL_CASTLE;
|
||||
}
|
||||
}
|
||||
|
||||
// King side castle
|
||||
if (Castling_Allowed[white_black_idx][1u] && (Board_State[kings_row][5u] == SQUARE_EMPTY) && (Board_State[kings_row][6u] == SQUARE_EMPTY))
|
||||
{
|
||||
Board_Lights[kings_row][6u] = POTENTIAL_MOVE;
|
||||
//First Check to see if the king will pass through check
|
||||
if(square_is_safe(kings_row, 5u) && square_is_safe(kings_row, 6u))
|
||||
{
|
||||
// Yay we can castle king side!
|
||||
Board_Lights[kings_row][6u] = POTENTIAL_CASTLE;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
Board_Lights[column][row] = PEICE_ORIGIN;
|
||||
break;
|
||||
}
|
||||
|
||||
@ -663,6 +733,11 @@ void Switch_Turns(void)
|
||||
{
|
||||
Game_State = (White_Turn ? GAME_STATE_P2_TURN_BEGINING : GAME_STATE_P1_TURN_BEGINING);
|
||||
White_Turn = !White_Turn;
|
||||
// Square is safe assumes the other team is trying to attack the square so for example at the end of
|
||||
// White's turn we want to see if the black king is now in check, so we will switch teams and then
|
||||
// Check if the current kings locations is safe. If it is safe then check is false, if it isnt safe then check is true.
|
||||
uint8_t white_black_idx = White_Turn ? 0u : 1u;
|
||||
Check[white_black_idx] = !square_is_safe(King_Locations[white_black_idx][0u], King_Locations[white_black_idx][1u]);
|
||||
}
|
||||
|
||||
/**
|
||||
@ -771,11 +846,15 @@ void Board_Square_Was_Toggled(uint8_t j, uint8_t i)
|
||||
/* We are waiting till the player who's turn it is picks up a peice that is on their team */
|
||||
if ((j < 8u) && (Board_State[j][i] != SQUARE_EMPTY) && (white_team(Board_State[j][i]) == White_Turn))
|
||||
{
|
||||
Mark_Potential_Moves(Board_State[j][i], i, j);
|
||||
if((Board_State[j][i] != KING_BLACK) && (Board_State[j][i] != KING_WHITE))
|
||||
{
|
||||
Check_If_Could_Cause_Check(j, i);
|
||||
}
|
||||
Selected_Peice = Board_State[j][i];
|
||||
Board_State[j][i] = SQUARE_EMPTY;
|
||||
Game_State++;
|
||||
Mark_Potential_Moves(Selected_Peice, i, j);
|
||||
Board_Lights[j][i] = PEICE_ORIGIN;
|
||||
Game_State++;
|
||||
}
|
||||
else
|
||||
{
|
||||
@ -815,6 +894,35 @@ void Board_Square_Was_Toggled(uint8_t j, uint8_t i)
|
||||
clear_lights();
|
||||
Game_State--;
|
||||
}
|
||||
else if (Board_Lights[j][i] == POTENTIAL_CASTLE)
|
||||
{
|
||||
Check_If_Moving_King(j, i);
|
||||
Board_State[j][i] = Selected_Peice;
|
||||
Selected_Peice = SQUARE_EMPTY;
|
||||
clear_lights();
|
||||
if(i == 2u)
|
||||
{
|
||||
Board_Lights[j][3u] = PEICE_NEEDS_TO_BE_HERE;
|
||||
Board_Lights[j][0u] = PEICE_NEEDS_TO_BE_REMOVED;
|
||||
}
|
||||
else if(i == 6u)
|
||||
{
|
||||
Board_Lights[j][5u] = PEICE_NEEDS_TO_BE_HERE;
|
||||
Board_Lights[j][7u] = PEICE_NEEDS_TO_BE_REMOVED;
|
||||
}
|
||||
else
|
||||
{
|
||||
/* Do nothing. */
|
||||
}
|
||||
|
||||
}
|
||||
else if (Board_Lights[j][i] == PEICE_NEEDS_TO_BE_REMOVED)
|
||||
{
|
||||
Selected_Peice = Board_State[j][i];
|
||||
Board_State[j][i] = SQUARE_EMPTY;
|
||||
Board_Lights[j][i] = LIGHT_OFF;
|
||||
Game_State = (White_Turn ? GAME_STATE_P1_TURN_TAKING : GAME_STATE_P2_TURN_TAKING);
|
||||
}
|
||||
else
|
||||
{
|
||||
Last_Game_State = Game_State;
|
||||
@ -831,7 +939,6 @@ void Board_Square_Was_Toggled(uint8_t j, uint8_t i)
|
||||
{
|
||||
if(j < 8u)
|
||||
{
|
||||
Check_If_Moving_King(j, i);
|
||||
Board_State[j][i] = Selected_Peice;
|
||||
Selected_Peice = SQUARE_EMPTY;
|
||||
Board_Lights[j][i] = LIGHT_OFF;
|
||||
@ -1069,13 +1176,13 @@ void draw_board(SDL_Renderer *p_renderer)
|
||||
Rectangle.x = starting_x;
|
||||
for (size_t i = 0; i < 8; i++)
|
||||
{
|
||||
if(Board_Lights[j][i] == POTENTIAL_MOVE)
|
||||
if ((Board_Lights[j][i] == POTENTIAL_MOVE) || (Board_Lights[j][i] == POTENTIAL_CASTLE))
|
||||
{
|
||||
SDL_SetRenderDrawColor(p_renderer, 0x00, 0xFF, 0x00, 0x00);
|
||||
SDL_RenderFillRect(p_renderer, &Rectangle);
|
||||
SDL_SetRenderDrawColor(p_renderer, 0x85, 0x5E, 0x42, 0x00);
|
||||
}
|
||||
else if ((Board_Lights[j][i] == POTENTIAL_TAKE) || (Board_Lights[j][i] == PEICE_NEEDS_TO_BE_HERE))
|
||||
else if ((Board_Lights[j][i] == POTENTIAL_TAKE) || (Board_Lights[j][i] == PEICE_NEEDS_TO_BE_HERE) || (Board_Lights[j][i] == PEICE_NEEDS_TO_BE_REMOVED))
|
||||
{
|
||||
SDL_SetRenderDrawColor(p_renderer, 0xFF, 0x00, 0x00, 0x00);
|
||||
SDL_RenderFillRect(p_renderer, &Rectangle);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user