C语言版贪吃蛇(详解)

#include
#include
#include
#include
#include
#define SCREEN_WIDTH 40 /*游戏屏幕宽度*/
#define SCREEN_LENGTH 15 /*游戏屏幕长度*/
#define START_X 16 /*屏幕起始X坐标*/
#define START_Y 2 /*屏幕起始y坐标*/

enum direc{up, down, left, right}; /*蛇的运动方向*/

typedef struct snake{ /*蛇身结构体*/
int x;
int y;
struct snake *next;
struct snake *pre;
struct snake *end;
}SNAKE;

typedef struct{ /*食物*/
int x;
int y;
}FOOD;

void HideCursor() /*隐藏光标，用到了一些CONSOLE API*/
{
HANDLE hOut = GetStdHandle(STD_OUTPUT_HANDLE);
CONSOLE_CURSOR_INFO cci;
GetConsoleCursorInfo(hOut, &cci);
cci.bVisible = FALSE;
SetConsoleCursorInfo(hOut, &cci);
}

void GotoRood(int x, int y) /*光标跳跃到某个位置，用了 CONSOLE API*/
{
HANDLE hOut = GetStdHandle(STD_OUTPUT_HANDLE);
COORD cod;
cod.X = x;
cod.Y = y;
SetConsoleCursorPosition(hOut, cod);
}
// sleep()代替delay sleep(500)表示延迟500ms

int Random(int n) /*随机生成食物的位置*/
{
srand(time(NULL));
return (rand() % n);
}

void BuildSnk(SNAKE *head) /*构造蛇身*/
{
SNAKE *p = head;
while (p != NULL)
{
GotoRood(p->x, p->y);
printf("#");
p = p->next;
}
}

void RemoveSnk(SNAKE *head) /*清除函数*/
{
SNAKE *p = head;
while (p != NULL)
{
GotoRood(p->x, p->y);
printf(" ");
p = p->next;
}
}

void Move(int *d) //移动方向。。。 上下左右 上：72 下：80 左：75 右：77
{
char ch;
while(_kbhit())
{
ch = getch();
if (ch == 72)
{
if ((*d == left || *d == right) && *d != down)
*d = up;
}
else if (ch == 80)
{
if ((*d == left || *d == right) && *d != up)
*d = down;
}
else if (ch == 75)
{
if ((*d == up || *d == down) && *d != right)
*d = left;
}
else if (ch == 77)
{
if ((*d == up || *d == down) && *d != left)
*d = right;
}
}
}

void IniScreen(SNAKE *head) /*初始化屏幕*/
{
int i,j;
SNAKE *p1, *p2;

HideCursor();
GotoRood(START_X,START_Y);
/*-------------画游戏边框---------------*/
for (i = 0; i < SCREEN_WIDTH + 2; i++)
printf("-");
for (j = 1; j <= SCREEN_LENGTH; j++)
{
GotoRood(START_X + SCREEN_WIDTH + 1, START_Y + j);
printf("|");
}
GotoRood(START_X, START_Y + SCREEN_LENGTH + 1);
for (i = 0; i < SCREEN_WIDTH + 2; i++)
printf("-");
for (j = 1; j <= SCREEN_LENGTH; j++)
{
GotoRood(START_X,START_Y + j);
printf("|");
}
GotoRood(START_X + 20, START_Y - 1);
printf("CopyRight@11计科 万齐飞");
GotoRood(0,START_Y + 2);
printf("游戏说明：\n\n↑设置等级\n\n按〖回车〗开始\n\n↑↓←→\n控制方向\n");
/*--------------孵化蛇------

-------------*/
head->x = START_X + SCREEN_WIDTH / 2;
head->y = START_Y + 8;
head->pre = NULL;
p1 = head;
i = 0;
while (++i < 3)
{

p2 = p1;
p1 = (SNAKE *)malloc(sizeof(SNAKE));
p1->x = START_X + SCREEN_WIDTH / 2;
p1->y = START_Y + 8 + i;
p1->end = NULL;
p2->next = p1;
p1->pre = p2; /////////////////
}
p1->next = NULL;
head->end = p1;
BuildBody(head);
}

void CreatFood(FOOD *fd, SNAKE *snk) /*做吃的，记得增加一个功能就是让食物不与蛇体冲突*/
{
SNAKE *p = snk;
int clash = 0; /*标记食物位置是否和蛇发生冲突*/
while(1)
{
clash = 0;
fd->x = START_X + 1 + Random(SCREEN_WIDTH); /* x控制在边宽内 */
fd->y = START_Y + 1 + Random(SCREEN_LENGTH); /* y控制在变长内 */
for (;p != NULL ;p = p->next)
if (fd->x == p->x && fd->y == p->y)
{
clash = 1;
break;
}
if (clash == 0)
break;
}
GotoRood(fd->x, fd->y);
printf("*");
}

void CollisionTest(SNAKE *head)
{
if (head->x == START_X) /*一头撞在左墙上.....*/
head->x = START_X + SCREEN_WIDTH; /*嗯...那从右边出来吧*/
else if (head->x == START_X + SCREEN_WIDTH + 1) /*..换个方向接着撞....*/
head->x = START_X + 1;
else if (head->y == START_Y) /*...再向上撞...*/
head->y = START_Y + SCREEN_LENGTH;
else if (head->y == START_Y + SCREEN_LENGTH + 1) /*下面也不能放过...*/
head->y = START_Y + 1;
}

int Eated(SNAKE *head, FOOD *fd) /*....有木有吃到食物*/
{
if (head->x == fd->x && head->y == fd->y)
return 1;
return 0;
}

int GameOver(SNAKE *head) /*判断游戏结束了没.*/
{
SNAKE *p;
for(p = head->next; p != NULL; p = p->next)
{
if (head->x == p->x && head->y == p->y)
return 1;
}
return 0;
}

void gameing() /*游戏过程*/
{
int i = 0, eat = 0, rank, scorelimit = 0, score = 0;
int direct = up; /* 初始方向为向上 */
time_t grade = 2; /* 初始等级为2 */
FOOD *fd;
SNAKE *head, *ptemp, *pnew; /*最少3个蛇身 + 1个蛇头的时候才会挂。 感觉用C++改成类来做会好一些。。*/

head = (SNAKE *)malloc(sizeof(SNAKE));
fd = (FOOD *)malloc(sizeof(FOOD));
GotoRood(START_X, START_Y - 1);
printf("Grade: %d", grade);
GotoRood(START_X + 10, START_Y - 1);
printf("Score: %-3d", score);
IniScreen(head);
CreatFood(fd, head);
while(rank = getch()) /*接受按键...↑设置等级【空格】开始游戏*/
{
if (rank == 72)
{
grade = ++grade % 10;
if (grade == 0)
grade = 1;
GotoRood(START_X, START_Y - 1);
printf("Grade: %d", grade);
}
else if (rank == 13)
break;
}
while (1)
{
RemoveSnk(head);
ptemp = (SNAKE *)malloc(sizeof(SNAKE)); /*临时的，用来增加在蛇的头部*/
Move(&direct); /*....接受用户选择

蛇的运动方向*/
switch(direct)
{
case up: ptemp->x = head->x;
ptemp->y = head->y - 1;
break;
case down: ptemp->x = head->x;
ptemp->y = head->y + 1;
break;
case left: ptemp->x = head->x - 1;
ptemp->y = head->y;
break;
case right: ptemp->x = head->x + 1;
ptemp->y = head->y;
break;
}
if (!eat) /*如果没吃到，那自然增加蛇的长度*/
{
ptemp->end = head->end->pre; /*将蛇的尾端位置改变，边为倒数第二个*/
head->end->pre->next = NULL; /*再连接下...*/
free(head->end);
head->end = NULL;
}
else
{
ptemp->end = head -> end;/*吃到了。。在原有的基础上换一个头，这样就多了一节*/
}
head->pre = ptemp; /*。。队列连接*/
ptemp->next = head;
ptemp->pre = NULL;
head = ptemp;
if (eat = Eated(head, fd))
{
CreatFood(fd,head);
score += grade; /*吃到了，就加分*/
scorelimit += grade;
if (scorelimit / 50 && grade <= 10) /*这个用来增加等级。*/
{ /*每过一次50分,等级增加一次，10级是上限..嘿嘿*/
GotoRood(START_X, START_Y - 1);
printf("Grade: %d", ++grade);
scorelimit = score % 50;
}
GotoRood(START_X + 10, START_Y - 1);
printf("Score: %-3d", score);
}
if (GameOver(head)) /*游戏是否结束....*/
{
BuildSnk(head); /*留下最后的英姿。。。吃货该死..*/
GotoRood(START_X + SCREEN_WIDTH / 2, START_Y + SCREEN_LENGTH / 2);
puts("Game Over!\n");
return;
}
CollisionTest(head); /*碰撞测试*/
BuildSnk(head);
Sleep((10 - grade) * 50); /*延时...程序会暂停(10 - grade)*50ms 的时间, windows.h里的函数*/
}
}

int main()
{
gameing();
return 0;
}