一个控制台贪吃蛇小游戏（wsad控制移动）

/********************************************
 * 程序名称：MR.DUAN 的贪吃蛇游戏（链表法）
 * 作　　者：WindAutumn <fluttingleaves@hotmail.com>
 * 最后修改：2012-7-25-PM
 * 版 本 号：1.3
 *
 *
 * 以后有空再修改
 * *****************************************/

#include<stdio.h>
#include<windows.h>
#include<conio.h>
#include<time.h>

#define MAXWIDE 80
#define MAXHIGH 24

typedef struct
{
    int x;
    int y;
} POSITION; // 食物，节点

typedef struct snackbody
{
    POSITION body;
    snackbody * link;
} SNACK; // 蛇身的链表

void StartGame();
void InitScreen(HANDLE hSnack);
void HideCursor(HANDLE hSnack);
void GotoXY(HANDLE hSnack, int x, int y);

void PrintRandFood(HANDLE hSnack, POSITION * food);
void PrintSnack(HANDLE hSnack, SNACK * snack, int mode);
//int  HeadDirection();
SNACK * SnackHeadWalk(SNACK * snack, int direction);
void IsDied(HANDLE hSnack, SNACK * snack, POSITION * food);
void GameOver(HANDLE hSnack);

void main()
{
    system("color 7b");// 白色背景
    SetConsoleTitle("MR.DUAN 的贪吃蛇游戏");
    StartGame();
}

void StartGame()
{
    POSITION food;
    SNACK * snack = (SNACK *)malloc(sizeof(SNACK));
    char length = 0;// 定义长度
    int  direction_get = 0;// 定义获取的方向
    int  direction_last = 0;// 定义之后的方向
    int  key_direct;// 按下的按键
    int  foodflag = 0;// 食物是否存在，1--是，0--否

    HANDLE hSnack = GetStdHandle(STD_OUTPUT_HANDLE);
    HideCursor(hSnack);
    InitScreen(hSnack);

    srand(time(NULL));// 初始化随机数生成器，以便产生随机 食物
    snack->body.x = 40;// 蛇头
    snack->body.y = 12;
    snack->link = NULL;

    PrintSnack(hSnack, snack, 0);// mode 0 打印初始蛇头
    Sleep(500);
    while(1)// 贪吃蛇操作
    {
        if(_kbhit())
        {
            key_direct = getch();
            switch(key_direct)
            {
            case 'w'  :
                direction_get = 1;
                break;// 上// 键盘四按键的逆序
            case 'a'  :
                direction_get = 2;
                break;// 左
            case 's'  :
                direction_get = 3;
                break;// 下
            case 'd'  :
                direction_get = 4;
                break;// 右
            }
        }
        if((direction_last != direction_get + 2)&&(direction_last != direction_get - 2))
            direction_last = direction_get;// 如果行进方向和获取方向不为相反，则改变行进方向
        snack = SnackHeadWalk(snack, direction_last);

        if(0 == foodflag)
        {
            PrintRandFood(hSnack, &food);// 如果食物已经被吃，则产生新的食物
            foodflag = 1;// 食物标记为 未吃
        }

        if(snack->body.x == food.x && snack->body.y == food.y)// 头碰到食物
        {
            PrintSnack(hSnack, snack, 0);// 只打头不去尾
            foodflag = 0;// 食物被吃，没有食物了
            length++;
        }
        else
        {
            PrintSnack(hSnack, snack, 0);// 打头
            PrintSnack(hSnack, snack, 1);// 去尾
        }
        IsDied(hSnack, snack, &food);
        Sleep(500);
    }
}

void InitScreen(HANDLE hSnack)// 打印周围红框框
{
    int i;
    SetConsoleTextAttribute(hSnack, FOREGROUND_INTENSITY | FOREGROUND_RED |
                            BACKGROUND_BLUE | BACKGROUND_GREEN | BACKGROUND_RED);// 红色字体，白色背景
    GotoXY(hSnack, 0, 0);
    printf("╔");
    for(i=1; i<(MAXWIDE-1)/2; i++)
        printf("═");
    printf("╗");

    for(i=1; i< MAXHIGH; i++)
    {
        GotoXY(hSnack, 0, i);
        printf("║");
        GotoXY(hSnack, MAXWIDE-2, i);
        printf("║");
    }

    GotoXY(hSnack, 0, MAXHIGH);
    printf("╚");
    for(i=1; i<(MAXWIDE-1)/2; i++)
        printf("═");
    printf("╝");

    GotoXY(hSnack, 0, 0);
}

void HideCursor(HANDLE hSnack)
{
    CONSOLE_CURSOR_INFO cursor_info = {1, 0};
    SetConsoleCursorInfo(hSnack, &cursor_info);
}

void GotoXY(HANDLE hSnack, int x, int y)
{
    COORD coord;
    coord.X = x;
    coord.Y = y;
    SetConsoleCursorPosition(hSnack, coord);
}

void PrintRandFood(HANDLE hSnack, POSITION * food)// 2--78 中的偶数, 1--23
{
    food->x = (rand()%76 + 2)/2*2;
    food->y = rand()%22 + 1;
    SetConsoleTextAttribute(hSnack,FOREGROUND_GREEN | BACKGROUND_BLUE | BACKGROUND_GREEN | BACKGROUND_RED);
    GotoXY(hSnack, food->x, food->y);
    printf("█");
}

void PrintSnack(HANDLE hSnack, SNACK * snack, int mode)
{
    if(0 == mode)
    {
        GotoXY(hSnack, snack->body.x, snack->body.y);
        SetConsoleTextAttribute(hSnack,FOREGROUND_BLUE | BACKGROUND_BLUE | BACKGROUND_GREEN | BACKGROUND_RED);
        printf("□");
    }
    if(1 == mode)
    {
        SNACK * ptail, *pnext;
        ptail = snack;
        pnext = ptail->link;
        while(pnext->link!=NULL)
        {
            ptail = ptail->link;
            pnext = ptail->link;
        }
        GotoXY(hSnack, pnext->body.x, pnext->body.y);
        printf("  ");
        ptail->link = NULL;
        free(pnext);
    }
}

/*int  HeadDirection()
{
HANDLE hInput = GetStdHandle(STD_INPUT_HANDLE);
INPUT_RECORD inRec;
DWORD res;

ReadConsoleInput(hInput, &inRec, 0, &res);
if(inRec.EventType == KEY_EVENT)
{
switch(inRec.Event.KeyEvent.wVirtualKeyCode)
{
case VK_UP    : return 1;
case VK_DOWN  : return 2;
case VK_LEFT  : return 3;
case VK_RIGHT : return 4;
}
}
return 0;
}*/

SNACK * SnackHeadWalk(SNACK * snack, int direction)
{
    // 0为默认值，默认向右，1为向上，2为向下，3为向左，4为向右

    SNACK * newhead = (SNACK * )malloc(sizeof(SNACK));
    switch(direction)
    {
    case 1 :
        newhead->body.x = snack->body.x;
        newhead->body.y = snack->body.y - 1;
        break;
    case 3 :
        newhead->body.x = snack->body.x;
        newhead->body.y = snack->body.y + 1;
        break;
    case 2 :
        newhead->body.x = snack->body.x - 2;
        newhead->body.y = snack->body.y;
        break;
    case 0 :
    case 4 :
        newhead->body.x = snack->body.x + 2;
        newhead->body.y = snack->body.y;
        break;
    }
    newhead->link = snack;
    return newhead;
}

void IsDied(HANDLE hSnack, SNACK * snack, POSITION * food)
{
    SNACK * pCompare = snack;
    if(snack->body.x == 0 || snack->body.y ==0 || snack->body.x == MAXWIDE ||snack->body.y == MAXHIGH)
        GameOver(hSnack);// 撞墙死亡
    while(pCompare->link!=NULL)
    {
        if(pCompare->body.x == snack->body.x && pCompare->body.y == snack->body.y && pCompare!=snack)
            GameOver(hSnack);// 吃到自己死亡
        pCompare = pCompare->link;
    }
}

void GameOver(HANDLE hSnack)
{
    GotoXY(hSnack, MAXWIDE/2, MAXHIGH/2);
    printf("GAME OVER!");
    GotoXY(hSnack, MAXWIDE/2, MAXHIGH/2 + 1);
    printf("PRESS ANY KEY TO EXIT.");
    getch();
    exit(0);
}