#include <stdio.h>

#include <windows.h>

#include <time.h>

#include <conio.h>

#define frame_height 20 //define map size

#define frame_width 40

#define UP "w" //define operate key

#define DOWN "s"

#define LEFT "a"

#define RIGHT "d"

int i,j,k;

char ch=UP; //initial direction

int grow=0; //flag: if snake grow

struct Food{

int x;

int y;

}food;

struct Snake{

int x[50];

int y[50];

int len;

int speed;

}snake; //snake[0] is head

void init_map(void);

void update_food(void);

void move_snake(void);

int is_alive(void);

void get_speed(void);

void gotoxy(int x, int y);

int main()

{

init_map(); //初始化地圖

while(1)

{

update_food(); //是否產生食物

get_speed(); //獲取速度

move_snake(); //移動蛇身

Sleep(snake.speed); //移動速度

if(!(is_alive())) //蛇的死活(撞牆或自食)

break;

}

printf("Game Over!");

getch();

return 0;

}

//initialize

void init_map(void)

{

//initial food

srand(time(NULL));

food.x=rand()%(frame_height-2)+1;

food.y=rand()%(frame_width-2)+1;

gotoxy(food.x, food.y);

printf("!");

//initial snake

snake.x[0]=frame_height/2;

snake.y[0]=frame_width/2;

gotoxy(snake.x[0], snake.y[0]);

printf("@");

snake.len=3;

snake.speed=200;

for(k=1;k<snake.len;k++)

{

snake.x[k]=snake.x[k-1]+1;

snake.y[k]=snake.y[k-1];

gotoxy(snake.x[k], snake.y[k]);

printf("@");

}

//initial bar

for(j=0;j<frame_width;j++)

{

gotoxy(0, j);

printf("#");

gotoxy(frame_height-1, j);

printf("#");

}

for(i=1;i<frame_height-1;i++)

{

gotoxy(i, 0);

printf("#");

gotoxy(i, frame_width-1);

printf("#");

}

}

//generate food

void update_food()

{

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

{

srand(time(NULL));

food.x=rand()%(frame_height-2)+1;

food.y=rand()%(frame_width-2)+1;

gotoxy(food.x, food.y);

printf("!");

snake.len++;

grow=1;

}

}

//move snake

void move_snake()

{

if(kbhit())

ch=getch();

if(!grow)

{

gotoxy(snake.x[snake.len-1], snake.y[snake.len-1]);

printf(" ");

}

for(k=snake.len-1;k>0;k--)

{

snake.x[k]=snake.x[k-1];

snake.y[k]=snake.y[k-1];

}

switch(ch)

{

case UP: snake.x[0]--;break;

case DOWN: snake.x[0]++;break;

case LEFT: snake.y[0]--;break;

case RIGHT: snake.y[0]++;break;

default: break;

}

gotoxy(snake.x[0], snake.y[0]);

printf("@");

grow=0;

gotoxy(frame_height, 0);

}

//is alive

int is_alive(void)

{

if(snake.x[0]==0||snake.x[0]==frame_height-1||snake.y[0]==frame_width-1||snake.y[0]==0)

return 0;

for(k=1;k<snake.len;k++)

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

return 0;

return 1;

}

//speed up

void get_speed(void)

{

if(snake.len<=6) snake.speed=200;

else if(snake.len<=10) snake.speed=100;

else if(snake.len<=20) snake.speed=50;

else if(snake.len<=30) snake.speed=30;

else snake.speed=20;

}

//move cursor

void gotoxy(int x, int y)

{

HANDLE hout;

COORD cor;

hout=GetStdHandle(STD_OUTPUT_HANDLE);

cor.X=y;

cor.Y=x;

SetConsoleCursorPosition(hout,cor);

}