贪吃蛇

#include <stdio.h>
#include <conio.h>
#include <stdlib.h>
#include <windows.h>
#include <time.h>
#define MAX__X 23
#define MAX__Y 50
#define MAX_FOOD 50
#define ESC 27
#define SPACE 32

typedef struct Node
{
    int x;
    int y;
    struct Node *next;
} Node,*LinkList;

typedef struct
{
    LinkList front;
    LinkList rear;
    int length;
} Queue;

Queue snake;

void gotoxy(int x,int y)//坐标定位
{
    COORD loc;
    loc.X  =  y;
    loc.Y  =  x;
    SetConsoleCursorPosition(GetStdHandle(STD_OUTPUT_HANDLE), loc);
}

void help_info()//显示帮助信息
{
    gotoxy(8,55);
    puts("按ESC键退出,空格键暂停:");
    gotoxy(10,55);
    puts("上,下,左,右:w,s,a,d");
    gotoxy(12,55);
    puts("蛇越长,速度也会越快:");
    gotoxy(14,55);
    puts("如无法控制蛇,请关闭");
    gotoxy(15,56);
    puts("大写键盘锁定状态:");
}

void game_info()//显示游戏信息
{
    gotoxy(3,60);
    printf("当前蛇长度: %d",snake.length);
    gotoxy(5,60);
    printf("               ");
    gotoxy(5,60);
    printf("离胜利还差: %d",MAX_FOOD-snake.length);
}

void enqueue(int x,int y)//入队
{
    LinkList p;
    p = (LinkList)malloc(sizeof(Node));
    p->x = x;
    p->y = y;
    snake.rear->next = p;
    snake.rear = p;
    p->next = NULL;
    snake.length++;
}

void dequeue()//出队
{
    LinkList p = snake.front;
    //保存食物位置
    p->next->x = p->x;
    p->next->y = p->y;
    snake.front = snake.front->next;
    snake.length--;
    free(p);
}

void destroy_queue()//销毁队列
{
    LinkList p;
    while(p = snake.front)
    {
        snake.front = snake.front->next;
        free(p);
    }
}

void snake_init()//初始化蛇,rear指向蛇头,front指向食物,front->next指向蛇尾
{
    int i;
    snake.rear = snake.front = (LinkList)malloc(sizeof(Node));
    snake.rear->next = NULL;
    snake.length = 0;
    for(i = 0; i < 3; i++)
    {
        enqueue(1,i + 1);
    }
}

void show_food()//随机化食物位置
{
    LinkList p;
    srand(time(NULL));//初始化随机种子
    while(1)
    {
        snake.front->x = rand() % (MAX__X-1) + 1;
        snake.front->y = rand() % (MAX__Y-1) + 1;
        p = snake.front->next;
        //防止食物出现在蛇内部
        while(p)
        {
            if(snake.front->x == p->x && snake.front->y == p->y)
            {
                break;
            }
            else
            {
                p = p->next;
            }
        }
        if(!p)
        {
            break;
        }
    }
    gotoxy(snake.front->x,snake.front->y);
    putchar('@');//食物
}

int judge()//判断失败与否
{
    LinkList p;
    if(snake.length >= MAX_FOOD)
    {
        system("cls");
        gotoxy(4,20);
        puts("恭喜你,赢了!!!");
        exit(0);
    }
    //碰到自身
    p = snake.front->next;
    while(snake.rear !=  p)
    {
        if(snake.rear->x == p->x && snake.rear->y == p->y)
        {
            break;
        }
        else
        {
            p = p->next;
        }
    }
    if(snake.rear == p)
    {
        //碰到边界
        if(snake.rear->x >= 1 && snake.rear->y >= 1 && snake.rear->x < MAX__X && snake.rear->y < MAX__Y)
        {
            return 1;
        }
    }
    system("cls");
    gotoxy(4,20);
    puts("GAME OVER!!!");
    destroy_queue();
    getch();
    exit(0);
}

void drow_wall()//画墙
{
    int i;
    for(i = 0; i <= MAX__Y; i++)
    {
        gotoxy(0,i);
        putchar('W');
        gotoxy(MAX__X,i);
        putchar('M');
        if(i <= MAX__X)
        {
            gotoxy(i,0);
            putchar('I');
            gotoxy(i,MAX__Y);
            putchar('I');
        }
    }
}

void drow_snake(int i)//0表示画蛇头,1表示画蛇身
{
    LinkList p;
    p = snake.rear;
    gotoxy(p->x,p->y);
    if(i)
    {
        putchar('*');    //蛇身
    }
    else
    {
        putchar('%');    //蛇头
    }
}

void clear_snake_tail()
{
    LinkList p = snake.front->next;
    gotoxy(p->x,p->y);
    putchar(' ');//清除旧蛇尾
    p = p->next;
    gotoxy(p->x,p->y);
    putchar('~');//添加新蛇尾
}

void snake_auto_move(char temp)//实现蛇的自动移动
{
    int x,y,speed;
    do
    {
        clear_snake_tail();
        drow_snake(1);//画蛇身
        x = snake.rear->x;
        y = snake.rear->y;
        switch(temp)
        {
            case 'w':
                x--;
                break;
            case 's':
                x++;
                break;
            case 'a':
                y--;
                break;
            case 'd':
                y++;
        }
        enqueue(x,y);//新蛇头入队
        if(snake.front->x == x && snake.front->y == y) //蛇捕捉到食物后,食物重新随机化
        {
            game_info();
            show_food();
        }
        else
        {
            dequeue();    //旧蛇尾出队
        }
        drow_snake(0);//画蛇头
        speed = -2.3 * snake.length + 157;
        Sleep(speed);//程序暂停speed个单位毫秒
    }
    while(!_kbhit() && judge()); //_kbhit为检测键盘输入
}

void snake_move()//实现玩家控制蛇的移动
{
    char c,pause;
    static char temp = 0;//静态局部变量
    pause = 0;
    if(!temp)  //一开始的时候让蛇先自动移动
    {
        temp = 'd';
        snake_auto_move(temp);
    }
    while(1)
    {
        c = getch();
        if(c == ESC) //退出
        {
            system("cls");
            puts("游戏退出成功!");
            system("pause");
            destroy_queue();
            exit(0);
        }
        if(pause == SPACE)
        {
            if(c == SPACE) //再按下空格键继续游戏
            {
                pause = 0;
                gotoxy(6,20);
                printf("           ");//消除~~Pause~~:
                snake_auto_move(temp);
            }
            continue;
        }
        if(c == SPACE) //按空格键暂停游戏
        {
            pause = SPACE;
            gotoxy(6,20);
            printf("~~Pause~~:");
            continue;
        }
        if(c == 'w' || c == 'a' || c == 's' || c == 'd')
        {
            if((temp == 'w' && c == 's') || (temp == 's' && c == 'w') || (temp == 'd' && c == 'a') || (temp == 'a' && c == 'd')) //不允许连续的两次内按相反的键
            {
                snake_auto_move(temp);
                continue;
            }
            break;
        }
        snake_auto_move(temp);
    }
    temp = c;
    snake_auto_move(temp);
}

int main()
{
    help_info();
    snake_init();
    show_food();
    drow_wall();
    game_info();
    while(judge())
    {
        snake_move();
    }
    return 0;
}