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done rook and bishop

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This commit is contained in:
Tommaso Rodolfo Masera 2019-08-04 18:41:55 +02:00
parent 9d3e28b9f0
commit 82beae1160
1 changed files with 54 additions and 5 deletions
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59
assignment1-18/chessboard.c
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@ -65,13 +65,13 @@ void print_chessboard(struct chessboard * cb) {
}
void cb_move(struct chessboard* cb, int from_row, int from_col, int to_row,
inline void cb_move(struct chessboard* cb, int from_row, int from_col, int to_row,
int to_col) {
cb->position[to_row][to_col] = cb->position[from_row][from_col];
cb->position[from_row][from_col] = EMPTY;
}
bool is_empty(struct chessboard* cb, int row, int col) {
inline bool is_empty(struct chessboard* cb, int row, int col) {
return cb->position[row][col] == EMPTY;
}
@ -79,6 +79,11 @@ inline enum player player(struct chessboard* cb, int row, int col) {
return cb->position[row][col] < 7 ? WHITE : BLACK;
}
inline int sign(int n) {
return n == 0 ? 0 : (n > 0 ? 1 : -1);
}
enum mstatus move_pawn(struct chessboard* cb, enum player p, int from_row,
int from_col, int to_row, int to_col) {
// two forward if in the starting position, no capture is valid
@ -109,6 +114,40 @@ enum mstatus move_pawn(struct chessboard* cb, enum player p, int from_row,
}
}
enum mstatus check_empty_paths(struct chessboard* cb, int from_row,
int from_col, int to_row, int to_col) {
int ii = sign(to_row - from_row), jj = sign(to_col - from_col);
int i = from_row + ii, j = from_col + jj;
for(; i != to_col || j != to_row; i += ii; j += jj) {
if (!is_empty(cb, i, j)) {
return INVALID;
}
}
cb_move(cb, from_row, from_col, to_row, to_col);
return VALID;
}
enum mstatus move_rook(struct chessboard* cb, enum player p, int from_row,
int from_col, int to_row, int to_col) {
if (to_row != from_row && to_col != from_col) {
return INVALID;
}
return check_empty_paths(cb, from_row, from_col, to_row, to_col);
}
enum mstatus move_bishop(struct chessboard* cb, enum player p, int from_row,
int from_col, int to_row, int to_col) {
if (from_row - to_row == from_col - to_col && from_row != to_row) {
return INVALID;
}
return check_empty_paths(cb, from_row, from_col, to_row, to_col);
}
enum mstatus move(
struct chessboard * cb, enum player p,
const char * from, const char * to)
@ -124,12 +163,12 @@ enum mstatus move(
int from_col = from[1] - '1', to_col = to[0] - '1';
// if you are moving thin air, EH VOLEVIH
if (cb->position[from_row][from_col] == EMPTY) {
if (is_empty(cb, from_row, from_col)) {
return INVALID;
}
// if you are moving someone else's pieces, "thou shall not steal"
if (cb->position[from_row][from_col] / 7 != p) {
if (player(cb, from_row, from_col) != p) {
return INVALID;
}
@ -141,13 +180,23 @@ enum mstatus move(
return INVALID;
}
// if you try to move on the same spot, don't do it you buffoon
if (from_row == to_row && from_col == to_col) {
return INVALID;
}
// try to understand which piece we are moving
switch (cb->position[from_row][from_col]) {
case WHITE_PAWN:
case BLACK_PAWN:
return move_pawn(cb, p, from_row, from_col, to_row, to_col);
case WHITE_ROOK:
case BLACK_ROOK:
return move_rook(cb, p, from_row, from_col, to_row, to_col);
case WHITE_BISHOP:
case BLACK_BISHOP:
return move_bishop(cb, p, from_row, from_col, to_row, to_col);
default:
return INVALID;
}
}