static void
add_mazes(void)
{
short i, j;
short start;
short maze_percent;
if (cur_level > 1) {
start = get_rand(0, (MAXROOMS-1));
maze_percent = (cur_level * 5) / 4;
if (cur_level > 15) {
maze_percent += cur_level;
}
for (i = 0; i < MAXROOMS; i++) {
j = ((start + i) % MAXROOMS);
if (rooms[j].is_room & R_NOTHING) {
if (rand_percent(maze_percent)) {
rooms[j].is_room = R_MAZE;
make_maze(get_rand(rooms[j].top_row+1, rooms[j].bottom_row-1),
get_rand(rooms[j].left_col+1, rooms[j].right_col-1),
rooms[j].top_row, rooms[j].bottom_row,
rooms[j].left_col, rooms[j].right_col);
hide_boxed_passage(rooms[j].top_row, rooms[j].left_col,
rooms[j].bottom_row, rooms[j].right_col,
get_rand(0, 2));
}
}
}
}
}
/*
* prepare_maze_level
* DESCRIPTION: Prepare for a maze of a given level. Fills the game_info
* structure, creates a maze, and initializes the display.
* INPUTS: level -- level to be used for selecting parameter values
* OUTPUTS: none
* RETURN VALUE: 0 on success, -1 on failure
* SIDE EFFECTS: writes entire game_info structure; changes maze;
* initializes display
*/
static int
prepare_maze_level (int level)
{
int i; /* loop index for drawing display */
/*
* Record level in game_info; other calculations use offset from
* level 1.
*/
game_info.number = level--;
/* Set per-level parameter values. */
if ((game_info.maze_x_dim = MAZE_MIN_X_DIM + 2 * level) >
MAZE_MAX_X_DIM)
game_info.maze_x_dim = MAZE_MAX_X_DIM;
if ((game_info.maze_y_dim = MAZE_MIN_Y_DIM + 2 * level) >
MAZE_MAX_Y_DIM)
game_info.maze_y_dim = MAZE_MAX_Y_DIM;
if ((game_info.initial_fruit_count = 1 + level / 2) > 6)
game_info.initial_fruit_count = 6;
if ((game_info.time_to_first_fruit = 300 - 30 * level) < 120)
game_info.time_to_first_fruit = 120;
if ((game_info.time_between_fruits = 300 - 60 * level) < 60)
game_info.time_between_fruits = 60;
if ((game_info.tick_usec = 20000 - 1750 * level) < 5000)
game_info.tick_usec = 5000;
/* Initialize dynamic values. */
game_info.map_x = game_info.map_y = SHOW_MIN;
/* Create a maze. */
if (make_maze (game_info.maze_x_dim, game_info.maze_y_dim,
game_info.initial_fruit_count) != 0)
return -1;
/* Set logical view and draw initial screen. */
set_view_window (game_info.map_x, game_info.map_y);
for (i = 0; i < SCROLL_Y_DIM; i++)
(void)draw_horiz_line (i);
/* Return success. */
return 0;
}
static void
make_maze(short r, short c, short tr, short br, short lc, short rc)
{
char dirs[4];
short i, t;
dirs[0] = UPWARD;
dirs[1] = DOWN;
dirs[2] = LEFT;
dirs[3] = RIGHT;
dungeon[r][c] = TUNNEL;
if (rand_percent(20)) {
for (i = 0; i < 10; i++) {
short t1, t2;
t1 = get_rand(0, 3);
t2 = get_rand(0, 3);
SWAP(dirs[t1], dirs[t2]);
}
}
for (i = 0; i < 4; i++) {
switch(dirs[i]) {
case UPWARD:
if (((r-1) >= tr) &&
(dungeon[r-1][c] != TUNNEL) &&
(dungeon[r-1][c-1] != TUNNEL) &&
(dungeon[r-1][c+1] != TUNNEL) &&
(dungeon[r-2][c] != TUNNEL)) {
make_maze((r-1), c, tr, br, lc, rc);
}
break;
case DOWN:
if (((r+1) <= br) &&
(dungeon[r+1][c] != TUNNEL) &&
(dungeon[r+1][c-1] != TUNNEL) &&
(dungeon[r+1][c+1] != TUNNEL) &&
(dungeon[r+2][c] != TUNNEL)) {
make_maze((r+1), c, tr, br, lc, rc);
}
break;
case LEFT:
if (((c-1) >= lc) &&
(dungeon[r][c-1] != TUNNEL) &&
(dungeon[r-1][c-1] != TUNNEL) &&
(dungeon[r+1][c-1] != TUNNEL) &&
(dungeon[r][c-2] != TUNNEL)) {
make_maze(r, (c-1), tr, br, lc, rc);
}
break;
case RIGHT:
if (((c+1) <= rc) &&
(dungeon[r][c+1] != TUNNEL) &&
(dungeon[r-1][c+1] != TUNNEL) &&
(dungeon[r+1][c+1] != TUNNEL) &&
(dungeon[r][c+2] != TUNNEL)) {
make_maze(r, (c+1), tr, br, lc, rc);
}
break;
}
}
}