// check if the snake collides with a fruit
int check_fruit_collision(GAME* game, int cury, int curx) {
// calculate the range, limit the range to a maximum of 5
int range = (game->snake.eat_range >= 5 ? 5 : game->snake.eat_range) - 1;
// calculate the start position
int startx = curx - range;
int starty = cury - range;
// calculate the end position
int endx = startx + range * 2 + 1;
int endy = starty + range * 2 + 1;
int x,y;
int on = 0; // check if there is food in the calculated range
// iterate througth every field inside the range
for(x = startx; x < endx; x++) {
for(y = starty; y < endy; y++) {
// is a fruit on the current field?
if(fruit_is_on(&game->fruits, y, x) != NULL) {
// exclude the field in the middle
if(!(curx == x && cury == y)) {
// execute the handler for this field (to eat the fruit)
check_fruit_collision_handler(game, y, x);
}
on = 1; // found one!
}
}
}
return on;
}
// remove a single fruit from the game by it's position
void kill_fruit(FRUITS *fruits, int posy, int posx) {
FRUIT *fruit;
// check if a fruit is on the given position
if((fruit = fruit_is_on(fruits, posy, posx)) != NULL) {
// remove the fruit
kill_fruit_by_ptr(fruits, fruit);
}
}
// calls the effect of the fruit
int check_fruit_collision_handler(GAME* game, int cury, int curx) {
// the the fruit by the given position
FRUIT *fruit = fruit_is_on(&game->fruits, cury, curx);
// is one on this position?
if(fruit != NULL) {
// execute the effect of the fruit
fruit->effect(game);
WINDOW *win = newwin(1, 1, cury, curx);
wprintw(win, " ");
wrefresh(win);
delwin(win);
// remove the fruit from the game
kill_fruit_by_ptr(&game->fruits, fruit);
}
return 1;
}
// create a new fruit in the game
void grow_fruit(GAME* game) {
int randy,randx;
// generate a new random position until a empty spot is found
do {
randy = rand() % game->rows;
randx = rand() % game->columns;
// is nothing else there in the generated position?
} while (snake_part_is_on(&game->snake, randy, randx) != NULL || fruit_is_on(&game->fruits, randy, randx) != NULL || check_extended_border_collision(game, randy, randx));
// increase the length
game->fruits.length++;
// allocate memory for the new fruit
if(game->fruits.length == 0) {
// initialize the array with malloc if it is the first fruit in the array
game->fruits.fruits = malloc(sizeof(FRUIT) * game->fruits.length);
} else {
// allocate more memory
game->fruits.fruits = realloc(game->fruits.fruits, sizeof(FRUIT) * game->fruits.length);
}
// get a filled struct (containing the displayed char, the effect & co.) of the new fruit
get_fruit(&game->fruits.fruits[game->fruits.length - 1], randy, randx);
}
