-struct Map init_map () {
-// Initialize map with some experimental start values.
- struct Map map;
- map.width = 64;
- map.height = 64;
- map.offset_x = 0;
- map.offset_y = 0;
- uint32_t size = map.width * map.height;
- map.cells = malloc(size);
- uint16_t y, x;
- for (y = 0; y < map.height; y++)
- for (x = 0; x < map.width; x++)
- map.cells[(y * map.width) + x] = '~';
- map.cells[size / 2 + (map.width / 2)] = '.';
- uint32_t repeats, root, curpos;
- for (root = 0; root * root * root < size; root++);
- for (repeats = 0; repeats < size * root; repeats++) {
- y = rrand(0, 0) % map.height;
- x = rrand(0, 0) % map.width;
- curpos = y * map.width + x;
- if ('~' == map.cells[curpos] &&
- ( (curpos >= map.width && '.' == map.cells[curpos - map.width])
- || (curpos < map.width * (map.height-1) && '.' == map.cells[curpos + map.width])
- || (curpos > 0 && curpos % map.width != 0 && '.' == map.cells[curpos-1])
- || (curpos < (map.width * map.height) && (curpos+1) % map.width != 0 && '.' == map.cells[curpos+1])))
- map.cells[y * map.width + x] = '.'; }
- return map; }
-
-void map_scroll (struct Map * map, char dir) {
-// Scroll map into direction dir if possible by changing the offset.
- if ('n' == dir && map->offset_y > 0)
- map->offset_y--;
- else if ('s' == dir)
- map->offset_y++;
- else if ('w' == dir && map->offset_x > 0)
- map->offset_x--;
- else if ('e' == dir)
- map->offset_x++; }
-
-void next_turn (struct World * world) {
-// Increment turn and move enemy.
- world->turn++;
- rrand(1, world->seed * world->turn);
- char d = rrand(0, 0) % 5;
- uint16_t ty = world->monster->y;
- uint16_t tx = world->monster->x;
- if (1 == d)
- ty++;
- else if (2 == d)
- ty--;
- else if (3 == d)
- tx++;
- else if (4 == d)
- tx--;
- if (tx == world->player->x && ty == world->player->y)
- update_log(world, "\nThe monster hits you.");
- else if (is_passable(world->map, ty, tx)) {
- world->monster->y = ty;
- world->monster->x = tx; } }
-
-void update_log (struct World * world, char * text) {
-// Update log with new text to be appended.
- char * new_text;
- uint16_t len_old = strlen(world->log);
- uint16_t len_new = strlen(text);
- uint16_t len_whole = len_old + len_new + 1;
- new_text = calloc(len_whole, sizeof(char));
- memcpy(new_text, world->log, len_old);
- memcpy(new_text + len_old, text, len_new);
- free(world->log);
- world->log = new_text; }
-
-char is_passable (struct Map * map, uint16_t y, uint16_t x) {
-// Check if coordinate on (or beyond) map is accessible to movement.
- char passable = 0;
- if (0 <= x && x < map->width && 0 <= y && y < map->height)
- if ('.' == map->cells[y * map->width + x])
- passable = 1;
- return passable; }
-
-void record_action (char action) {
-// Append action to game record file.
- FILE * file = fopen("record", "a");
- fputc(action, file);
- fclose(file); }
-
-void move_player (struct World * world, char d) {
-// Move player in direction d, increment turn counter and update log.
- static char prev = 0;
- char success = 0;
- char * dir;
- uint16_t ty = world->player->y;
- uint16_t tx = world->player->x;
- if ('s' == d) {
- dir = "south";
- ty++; }
- if ('n' == d) {
- dir = "north";
- ty--; }
- if ('w' == d) {
- dir = "west";
- tx--; }
- if ('e' == d) {
- dir = "east";
- tx++; }
- if (ty == world->monster->y && tx == world->monster->x)
- success = 2;
- else if (is_passable(world->map, ty, tx)) {
- success = 1;
- world->player->y = ty;
- world->player->x = tx; }
- if (success * d == prev)
- update_log (world, ".");
- else {
- if (2 == success)
- update_log (world, "\nYou hit the monster.");
- else {
- char * msg = calloc(25, sizeof(char));
- char * msg_content = "You fail to move";
- if (1 == success)
- msg_content = "You move";
- sprintf(msg, "\n%s %s.", msg_content, dir);
- update_log (world, msg);
- free(msg); } }
- prev = success * d;
- if (1 == world->interactive)
- record_action(d);
- next_turn (world); }
-
-void player_wait (struct World * world) {
-// Make player wait one turn.
- if (1 == world->interactive)
- record_action(0);
- next_turn (world);
- update_log (world, "\nYou wait."); }
-