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贪吃蛇.cpp

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+#include<iostream>
+using namespace std;
+#include<easyx.h>       //包含图形库头文件
+#include<stdlib.h>      
+#include<time.h>       
+
+#define WIDTH 1040  //定义场景大小   
+#define HEIGHT 640    
+#define SIZE  20   //定义食物以及蛇的大小   一个格子的大小
+#define UP 1    //定义蛇的朝向
+#define DOWN -1
+#define LEFT 2
+#define RIGHT -2
+#define MAX 2000   //蛇的最大长度
+
+
+typedef struct
+{
+    int x;
+    int y;
+}SnakeNode;
+
+SnakeNode temp[MAX];    //用另外一个数组来存储蛇原来的位置
+int speed = 150;        //蛇的速度
+
+//创建蛇的类
+class Snake
+{
+    friend class Food;
+public:
+    Snake();                    //初始化
+    void Move();                //移动
+    void Draw();                //绘制蛇
+    bool Eat(Food food);        //吃食物
+    bool Defeat();              //失败判定
+private:
+    int dirt;                   //朝向
+    int length;                 //长度
+    SnakeNode node[MAX];        //蛇的坐标
+};
+
+//创建食物的类
+class Food
+{
+    friend class Snake;
+public:
+    Food(Snake snake);          //食物初始化
+    void Draw();                //绘制食物
+private:
+    int x, y;                   //坐标
+};
+
+//蛇的初始化
+Snake::Snake()
+{
+    dirt = RIGHT;
+    length = 3;
+    //下标是0的位置为蛇的头部
+    for (int i = 0; i < length; i++)
+    {
+        node[i].x = 60 - ((i + 1) * SIZE);//坐标带上20
+        node[i].y = 0;
+    }    //固定刚开始蛇的位置
+    //蛇一开始从屏幕的左上角出现
+}
+
+//移动
+void Snake::Move()
+{
+    for (int i = 0; i < length; i++)    //将原来的蛇结点拷贝一份
+    {
+        temp[i].x = node[i].x;
+        temp[i].y = node[i].y;
+    }
+    int status = 0;    //用来判断是否点击了转向按键
+    if (dirt == RIGHT) //四个方向，讨论现在的方向，分别判断是否转向，不能反向。
+    {
+        //判断是否转向
+        if (GetAsyncKeyState('W') && status == 0) //捕捉键盘输入为w，easyx 判断转向
+        {
+            dirt = UP;  //去了if(dirt==up)的else
+            status = 1;
+        }
+        else if (GetAsyncKeyState('S') && status == 0)
+        {
+            dirt = DOWN;
+            status = 1;
+        }
+        else
+        {
+            node[0].x = node[0].x + SIZE;
+        }
+    }
+    if (dirt == DOWN)
+    {
+        //判断是否转向
+        if (GetAsyncKeyState('A') && status == 0)
+        {
+            dirt = LEFT;
+            status = 1;
+        }
+        else if (GetAsyncKeyState('D') && status == 0)
+        {
+            node[0].x = node[0].x + SIZE;
+            dirt = RIGHT;
+            status = 1;
+        }
+        else
+        {
+            node[0].y = node[0].y + SIZE;
+        }
+    }
+    if (dirt == LEFT)
+    {
+        //判断是否转向
+        if (GetAsyncKeyState('W') && status == 0)
+        {
+            dirt = UP;
+            status = 1;
+        }
+        else if (GetAsyncKeyState('S') && status == 0)
+        {
+            node[0].y = node[0].y + SIZE;
+            dirt = DOWN;
+            status = 1;
+        }
+        else
+        {
+            node[0].x -= SIZE;
+        }
+    }
+    if (dirt == UP)
+    {
+        //判断是否转向
+        if (GetAsyncKeyState('A') && status == 0)
+        {
+            node[0].x = node[0].x - SIZE;
+            dirt = LEFT;
+            status = 1;
+        }
+        else if (GetAsyncKeyState('D') && status == 0)
+        {
+            node[0].x = node[0].x + SIZE;
+            dirt = RIGHT;
+            status = 1;
+        }
+        else
+        {
+            node[0].y = node[0].y - SIZE;
+            //改变坐标
+        }
+    }
+
+    //移动
+    for (int i = 1; i < length; i++)
+    {
+        node[i].x = temp[i - 1].x;
+        node[i].y = temp[i - 1].y;
+    }
+    Sleep(speed);   //休眠这么长时间，停顿一下
+}
+
+//绘制蛇
+void Snake::Draw()
+{
+    cleardevice();   //清空原先的绘图
+    srand((unsigned)time(NULL));   //设置颜色随机数（setfillcolor)时用
+    for (int i = 0; i < length; i++)
+    {
+        setfillcolor(RGB(rand() % 256, rand() % 256, rand() % 256));  //五颜六色的蛇
+        fillrectangle(node[i].x, node[i].y, node[i].x + SIZE, node[i].y + SIZE);
+    }
+}
+
+//吃食物
+bool Snake::Eat(Food food)
+{
+    if (food.x == node[0].x && food.y == node[0].y) //头有没有碰到食物
+    {
+        if (node[length - 1].x - node[length - 2].x == 0 && node[length - 1].y - node[length - 2].y == -20)
+        {   
+            //判断蛇尾巴的方向（数组最后两个点的位置关系），新点加在尾巴后面
+            length++;
+            node[length - 1].x = node[length - 2].x;
+            node[length - 1].y = node[length - 2].y - SIZE;
+        }
+        else if (node[length - 1].x - node[length - 2].x == 0 && node[length - 1].y - node[length - 2].y == 20)
+        {
+            length++;
+            node[length - 1].x = node[length - 2].x;
+            node[length - 1].y = node[length - 2].y + SIZE;
+        }
+        else if (node[length - 1].x - node[length - 2].x == 20 && node[length - 1].y - node[length - 2].y == 0)
+        {
+            length++;
+            node[length - 1].x = node[length - 2].x + SIZE;
+            node[length - 1].y = node[length - 2].y;
+        }
+        else if (node[length - 1].x - node[length - 2].x == -20 && node[length - 1].y - node[length - 2].y == 0)
+        {
+            length++;
+            node[length - 1].x = node[length - 2].x - SIZE;
+            node[length - 1].y = node[length - 2].y;
+        }
+
+        return true;
+    }
+    return false;
+}
+
+//失败判定
+bool Snake::Defeat()
+{
+    //碰到边界
+    if (node[0].x < 0 || node[0].x >= WIDTH || node[0].y < 0 || node[0].y >= HEIGHT)
+        return true;
+
+    //碰到自己的身体
+    for (int i = 1; i < length; i++)
+    {
+        if (node[0].x == node[i].x && node[0].y == node[i].y)
+            return true;
+    }
+    return false;
+}
+
+//食物的初始化
+Food::Food(Snake snake)
+{
+table:
+    srand((unsigned)time(NULL));     //设计随机种子，产生随机数
+    x = (rand() % (WIDTH / SIZE)) * SIZE;
+    y = (rand() % (HEIGHT / SIZE)) * SIZE;
+
+    for (int i = 0; i < snake.length; i++)
+    {
+        if (snake.node[i].x == x && snake.node[i].y == y)
+            goto table;   //如果食物在蛇身上，则重新初始化
+    }
+}
+
+//绘制食物
+void Food::Draw()
+{
+    setfillcolor(GREEN);   //食物是绿色
+    fillrectangle(x, y, x + SIZE, y + SIZE); //绘制食物为矩形，四个顶点坐标。
+}
+
+int main()
+{
+    initgraph(WIDTH, HEIGHT);
+    Snake snake;
+
+table:
+    Food food(snake);
+    while (1)
+    {
+        BeginBatchDraw();
+        FlushBatchDraw();   //双缓冲，防止屏幕一闪一闪的
+        snake.Draw();
+        food.Draw();
+        FlushBatchDraw();   //双缓冲，防止屏幕一闪一闪的
+        EndBatchDraw();      
+        /*双缓冲，防止屏幕一闪一闪的*/
+        if (snake.Eat(food))
+        {
+            goto table;  //如果吃到食物，就再设置一个食物
+        }
+        if (snake.Defeat())
+        {
+            break;
+        }
+        snake.Move();
+    }
+
+    HWND window = GetHWnd();   //弹窗，提示游戏失败
+    SetWindowText(window, L"提示");     //修改窗口标题，设置成提示
+    MessageBox(window, L"游戏失败", L"提示", MB_OKCANCEL);   
+    //提示失败信息  MB_OKCANCEL：下面有两个按键，确定或取消
+
+    return 0;
+}