c - C语言中的移动蛇

Question

我们正在 STM32 探索板上创建一个贪吃蛇游戏，并将其显示在 LED 屏幕上。我们将蛇存储在链表类型的结构中。我们搞定了碰撞检测的东西，我们知道如何移动蛇的头，但我们不知道如何让它长出来。你能给我们一些建议吗？

这是我们拥有的:

void move_seg() {
  struct seg *temp = malloc(sizeof(struct seg));
  temp->x = head->x + xdir[direction]*4;
  temp->y = head->y + ydir[direction]*4;
  head->next = temp;
  head = temp;
  draw_seg(head, WHITE);
  //check if snake collided with itself..
  collision_detection();
  //check if apple was eaten
  apple_eaten();
  if (apple_was_eaten) { 
    draw_seg(tail, WHITE);
  }
  else { 
    draw_seg(tail, BLACK);
  }
  tail = tail->next;
  }
}

Answer 1

我只是想发布一个更新来展示我们所做的。一旦我们添加一个指向 seg 结构的 prev 指针并创建一个棋盘大小的矩阵来存储苹果/蛇段所在的位置，这是一个非常简单的修复。

我们仅在头部未与苹果发生碰撞时才删除尾部。

void move_seg() {
  //get head's next position, set that as new head
  seg* next_head = malloc(sizeof(seg));
  next_head->x = (head->x + xdir[direction] + 24) % 24;
  next_head->y = (head->y + ydir[direction] + 32) % 32;
  next_head->prev = 0;
  next_head->next = head;
  head->prev = next_head;
  head = next_head;

  int delete_tail = 1;

  //check if head collided with apple
  if (board[head->x][head->y] == HAS_APPLE) {
    //if so, delete tail, create new apple
    delete_tail = 0;
    create_apple();
  }

  //check if head collided with any other part of the snake
  if (board[head->x][head->y] == HAS_SNAKE) {
    //if so, game over
    game_over = 1;
  }

  //draw the head, add it to the matrix
  draw_seg(head, WHITE);
  board[head->x][head->y] = HAS_SNAKE;

  //if the snake didn't collide with an apple 
  if (delete_tail) {
    //delete the tail
    board[tail->x][tail->y] = 0;
    seg* temp = tail;
    tail = temp->prev;
    tail->next = 0;
    draw_seg(temp, BLACK);
    //free(temp);
  }
}