/*

* 绘制蛇身

*/

void initsnake()

{

snake *tail;//该指针表示蛇尾

int i;

tail = (snake*)malloc(sizeof(snake));

tail->x = 24;//蛇尾坐标：(24,5)

tail->y = 5;

for(i = 1;i<=4;i++)

{

head = (snake*)malloc(sizeof(snake));

head->next = tail;//蛇头坐标:(24+2*i,5)  i>1&&i<4

head->x = 24+2*i;

head->y = 5;

tail = head;

}

while(tail!=NULL)

{

gotoxy(tail->x,tail->y);

color(14);//14黄色

printf("★");

tail = tail->next;

}

}

/*

* 绘制食物并随机显示

*/

void createfood()

{

snake *food_1;

food_1 = (snake*)malloc(sizeof(snake));

srand((unsigned)time(NULL));

while((food_1->x%2)!=0)//食物的x轴坐标

{

food_1->x = rand()%52+2;//52为整个游戏界面的宽

}

food_1->y = rand()%24+1;//y值坐标在1-24之间

q = head;//蛇头坐标

while(q->next == NULL)

{

if(q->x == food_1->x&&q->y == food_1->y)

{

free(food_1);

createfood();

}

q=q->next;//查找蛇身上的所有坐标，所有坐标都不能跟蛇身重叠

}

gotoxy(food_1->x,food_1->y);

food = food_1;

color(12);//red color

printf("●");

}

/*

* 判断是否咬到自己

*/

int biteself()

{

snake *self;

self = head->next;

while(self!=NULL)

{

if(self->x == head->x&&self->y == head->y)

{

return 1;//1表示蛇咬到了自己

}

self = self->next;

}

return 0;

}

/*

* 判断是否撞墙

*/

void cantcrosswall()

{

if(head->x==0||head->x==56||head->y==0||head->y==26)

{

endgamestatus = 1;

endgame();

}

}

/*

* 蛇变速前进（吃到食物加速和按F1加速)

*/

void speedup()

{

if(sleeptime>=50)

{

sleeptime = sleeptime-10;

add = add+2;

}

}