//贪吃蛇

#include <graphics.h>

#include <conio.h>

#include <time.h>

#include <stdlib.h>

#include <stdio.h>

#define SIZEMAX100

#define SNAKELEN10

#define SPEED100

typedef enum

{

left, right, up, down

}DIR;

typedef struct

{

int x;

int y;

}COOR;

struct FOOD

{

COOR crd;

int flag;

}food;

struct SNAKE

{

COOR crd[SIZEMAX];

int node;

DIR dir;

}snake;

int speed = SPEED;

void init();

void setfoodcrd();

void showfood();

void snakemove();

void judgeslod();

void judgesef();

void showsnake();

void changeskdir();

void gameover();

void main()

{

init();

while (1)

{

while (!_kbhit())

{

if (!food.flag)

{

setfoodcrd();

}

showfood();

judgeslod();

judgesef();

snakemove();

Sleep(speed);

}

changeskdir();

}

}

void init()

{

initgraph(640, 480);

srand(time(NULL));

food.flag = 0;

snake.crd[0].x = 0 + SNAKELEN;

snake.crd[0].y = 0;

snake.crd[1].x = 0;

snake.crd[1].y = 0;

snake.node = 2;

snake.dir = right;

}

void setfoodcrd()

{

food.crd.x = rand() % (600 / SNAKELEN) * SNAKELEN;

food.crd.y = rand() % (480 / SNAKELEN) * SNAKELEN;

food.flag = 1;

}

void showfood()

{

rectangle(food.crd.x, food.crd.y, food.crd.x + SNAKELEN, food.crd.y + SNAKELEN);

}

void snakemove()

{

int i; for (i = snake.node; i>0; i--)

{

snake.crd[i].x = snake.crd[i - 1].x;

snake.crd[i].y = snake.crd[i - 1].y;

}

switch (snake.dir)

{

case up:

snake.crd[0].y -= SNAKELEN;

break;

case down:

snake.crd[0].y += SNAKELEN;

break;

case left:

snake.crd[0].x -= SNAKELEN;

break;

case right:

snake.crd[0].x += SNAKELEN;

} showsnake();

}

void judgeslod()

{

int i;

if (snake.crd[0].x<0 || snake.crd[0].x >= 640 ||

snake.crd[0].y<0 || snake.crd[0].y >= 480)

{

gameover();

getchar();

exit(0);

}

for (i = snake.node - 1; i>0; i--)

{

if (snake.crd[0].x == snake.crd[i].x && snake.crd[0].y == snake.crd[i].y)

{

gameover();

getchar();

exit(0);

}

}

}

void judgesef()

{

if (snake.crd[0].x == food.crd.x && snake.crd[0].y == food.crd.y)

{

snake.node++;

setcolor(BLACK);

rectangle(food.crd.x, food.crd.y, food.crd.x + SNAKELEN, food.crd.y + SNAKELEN);

setcolor(WHITE);

food.flag = 0;

}

}

void showsnake()

{

int i;

for (i = snake.node - 1; i >= 0; i--)

{

rectangle(snake.crd[i].x, snake.crd[i].y, snake.crd[i].x + SNAKELEN, snake.crd[i].y + SNAKELEN);

}

setcolor(BLACK);

rectangle(snake.crd[snake.node].x, snake.crd[snake.node].y, snake.crd[snake.node].x + SNAKELEN, snake.crd[snake.node].y + SNAKELEN);

setcolor(WHITE);

rectangle(snake.crd[snake.node - 1].x, snake.crd[snake.node - 1].y, snake.crd[snake.node - 1].x + SNAKELEN, snake.crd[snake.node - 1].y + SNAKELEN);

}

void changeskdir()

{

char key;

key = _getch();

switch (key)

{

case 'w':

case 'W':

case 72:

if (snake.dir != down)

{

snake.dir = up;

}

break;

case 's':

case 'S':

case 80:

if (snake.dir != up)

{

snake.dir = down;

}

break;

case 'a':

case 'A':

case 75:

if (snake.dir != right)

{

snake.dir = left;

}

break;

case 'd':

case 'D':

case 77:

if (snake.dir != left)

{

snake.dir = right;

}

break;

}

}

void gameover()

{

closegraph();

printf("game over!\n");

}