C语言 —— 贪吃蛇

参考视频：https://www.bilibili.com/video/av29580072/?p=1

GreedySnake.h

 #ifndef GREEDYSNAKE_H_INCLUDED
 #define GREEDYSNAKE_H_INCLUDED

 #define SNAKE_LENGTH 20   //蛇的长度最大为20
 #define true  1
 #define false 0
 enum {UP = -, DOWN = , LEFT = -, RIGHT = };

 typedef int bool;

 void FirstPage();                   //设置起始游戏界面
 void TestSpace();                   //按空格开始游戏
 void ShowBackground();              //展示游戏背景
 void SetSnakeRandPos();             //为蛇产生一个随机的位置
 void DrawSnake();                   //画蛇
 void SnakeMove();                   //蛇动
 void DestroySnake();                //销毁蛇
 void ChangeDir();                   //蛇随着方向键动起来
 bool IsSnakeDie();                  //判断蛇是否死亡
 void ProduceFood();                 //随机位置产生食物
 void SnakeGrowUp();                 //蛇变长
 void PrintScore();                  //打印分数

 #endif // GREEDYSNAKE_H_INCLUDED

GreedySnake.c

 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <conio.h>
 #include <windows.h>
 #include <time.h>
 #include "GreedySnake.h"

 //把所有元素置为0
 //snake[0][0]表示蛇头的行，snake[0][1]表示蛇头的列，snake[0][2]表示蛇头移动的方向
 int g_arrSnake[SNAKE_LENGTH][] = {  };

 int g_iSnakeLength = ; //初始长度为3，但数组下标从0开始，故此处为2

 char g_arrBackGround[][] =
 {
     "████████████████████████\n",    //一个█占两个字节，占两个字符的位置
     "█                                            █\n",
     "█                                            █\n",
     "█                                            █\n",
     "█                                            █\n",
     "█                                            █\n",
     "█                                            █\n",
     "█                                            █\n",
     "█                                            █\n",
     "█                                            █\n",
     "█                                            █\n",
     "█                                            █\n",
     "█                                            █\n",
     "█                                            █\n",
     "█                                            █\n",
     "█                                            █\n",
     "█                                            █\n",
     "█                                            █\n",
     "█                                            █\n",
     "████████████████████████\n"
 };

 int g_iSnakeDir = LEFT;     //蛇的方向,默认向左
 bool g_bIsProFood = true;         //蛇产生食物的标记
 int g_iRow;  //食物的行坐标
 int g_iCol;  //食物的列坐标

 int g_iScore = ;   //分数

 void FirstPage()         //设置起始游戏界面
 {
     for (int i = ; i < ; ++i)
         printf(" ");
     for (int i = ; i < ; ++i)
         printf("*");
     printf("\n");

     for (int j = ; j < ; ++j)
     {
         for (int i = ; i < ; ++i)
             printf(" ");
         printf("*");
         for (int i = ; i < ; ++i)
             printf(" ");
         printf("*\n");
     }

     for (int i = ; i < ; ++i)
         printf(" ");
     printf("*");
     for (int i = ; i < ; ++i)
         printf(" ");
     printf("《 欢迎来到贪吃蛇的世界！》");
     for (int i = ; i < ; ++i)
         printf(" ");
     printf("*\n");

     for (int i = ; i < ; ++i)
         printf(" ");
     printf("*");
     for (int i = ; i < ; ++i)
         printf(" ");
     printf("《  请按空格键开始游戏   》");
     for (int i = ; i < ; ++i)
         printf(" ");
     printf("*\n");

     for (int j = ; j < ; ++j)
     {
         for (int i = ; i < ; ++i)
             printf(" ");
         printf("*");
         for (int i = ; i < ; ++i)
             printf(" ");
         printf("*\n");
     }

     for (int i = ; i < ; ++i)
         printf(" ");
     for (int i = ; i < ; ++i)
         printf("*");
     for (int i = ; i < ; ++i)
         printf("\n");
 }

 void TestSpace()     //按空格开始游戏
 {
     char c;
     while ((c = getch()) != ' ')     //getch()在头文件<conio>内
     {

     }
     system("cls");                  //清屏
 }

 void ShowBackground()              //展示游戏背景
 {
     for (int i = ; i < ; ++i)
         printf(g_arrBackGround[i]);
 }

 void SetSnakeRandPos()    //设置蛇的初始位置，默认蛇的身子为三节，向左移动
 {
     int x, y;
     srand((unsigned)time(NULL));
     x = rand()%  + ;         //因为蛇的身子起始为三节，所以x的范围为1-20(蛇不能起始就撞墙)
     y = rand()%  + ;

     g_arrSnake[][] = y;      //行     注意：x，y和初始背景中的行列刚好是反的
     g_arrSnake[][] = x * ;  //列     注意：一个█占两个字节，所以算其坐标时要乘以2
     g_arrSnake[][] = LEFT;   //方向

     g_arrSnake[][] = y;
     g_arrSnake[][] = x *  + ;
     g_arrSnake[][] = LEFT;

     g_arrSnake[][] = y;
     g_arrSnake[][] = x *  + ;
     g_arrSnake[][] = LEFT;

     DrawSnake();
 }

 void DrawSnake()   //展示蛇
 {
     //因为一个█占两个字节，所以不能直接用strcpy(&arrBackGround[arrSnake[i][0]][arrSnake[i][1]],"█");否则会把\0拷贝进来，导致出错
     //由于前面把arrSnake的所有元素都置为了0，所以当arrSnake[i][0]为0时，代表那个坐标处没有蛇的身子
     for (int i = ; g_arrSnake[i][] != ; ++i)
         strncpy(&g_arrBackGround[g_arrSnake[i][]][g_arrSnake[i][]], "█", );     //注意取地址符&不能漏掉！
 }

 void DestroySnake()                //销毁蛇
 {
     for (int i = ; g_arrSnake[i][] != ; ++i)
         strncpy(&g_arrBackGround[g_arrSnake[i][]][g_arrSnake[i][]], "  ", );       //注意取地址符&不能漏掉！

 }

 void SnakeMove()       //蛇动
 {
     DestroySnake();
     for(int i = SNAKE_LENGTH - ; i >= ; --i)
     {
         if(g_arrSnake[i][] != )
         {
             //把前一个节点的值，赋给当前节点
             g_arrSnake[i][] = g_arrSnake[i-][];
             g_arrSnake[i][] = g_arrSnake[i-][];
             g_arrSnake[i][] = g_arrSnake[i-][];
         }
     }

     g_arrSnake[][] = g_iSnakeDir;     //设置蛇头方向

     //处理第一个节点(蛇头)
     if(g_arrSnake[][] == LEFT || g_arrSnake[][] == RIGHT)   //左右移动，列加减2
     {
         g_arrSnake[][] += g_arrSnake[][];
     }
     else
     {
         g_arrSnake[][] += g_arrSnake[][];                   //上下移动，行加减1
     }

     DrawSnake();

 }

 void ChangeDir()       //改变方向
 {
     //不能用getchar()， 会回显，并且要按回车之后才会开始读取
     //不能用getch(), 同步检测

     //异步检测
     if(GetAsyncKeyState('W'))
     {
         if (g_arrSnake[][] != DOWN)    //蛇不能回头
            g_iSnakeDir = UP;
     }

     if(GetAsyncKeyState('S'))
     {
         if (g_arrSnake[][] != UP)
             g_iSnakeDir = DOWN;
     }

     if(GetAsyncKeyState('A'))
     {
         if (g_arrSnake[][] != RIGHT)
            g_iSnakeDir = LEFT;
     }

     if(GetAsyncKeyState('D'))
     {
         if (g_arrSnake[][] != LEFT)
             g_iSnakeDir = RIGHT;
     }
 }

 bool IsSnakeDie()   //蛇死亡判断(包括撞墙和吃自己，两种情况)
 {
     if(g_arrSnake[][] == LEFT || g_arrSnake[][] == RIGHT)   //如果蛇左右移动，则判断蛇头的左右是否是"█"，如果是，则判定为蛇死亡
     {
         if(!strncmp(&g_arrBackGround[g_arrSnake[][]][g_arrSnake[][]+g_arrSnake[][]], "█", ))   //注意取地址符&不能漏掉！
             return true;
     }
     else                                              //如果蛇上下移动，则判断蛇头的上下是否是"█"
     {
         if(!strncmp(&g_arrBackGround[g_arrSnake[][]+g_arrSnake[][]][g_arrSnake[][]], "█", ))
             return true;
     }
     return false;
 }

 void ProduceFood()                 //随机位置产生食物
 {
     //判断是否产生新的食物
     if(g_bIsProFood == false)
         return;

     bool bFlag = true;
     srand((unsigned)time(NULL));

     while()     //产生合法的食物，即食物不与蛇的身子重合
     {
         g_iRow = rand()%  + ;   //行
         g_iCol = rand()%  + ;

         for (int i = ; g_arrSnake[i][] != ; i++)   //遍历蛇
             if (g_iRow == g_arrSnake[i][] && g_iCol == g_arrSnake[i][])       //如果在食物产生在蛇身上
             {
                 bFlag = false;
                 break;
             }

         if(bFlag == true)
             break;
     }

     strncpy(&g_arrBackGround[g_iRow][g_iCol*],  "★", );
     g_bIsProFood = false;
 }

 void SnakeGrowUp()                 //蛇变长
 {
     if(g_iRow == g_arrSnake[][] && g_iCol* == g_arrSnake[][])    //注意：列要乘以2
     {
         if (UP == g_arrSnake[g_iSnakeLength][])
         {
             g_arrSnake[g_iSnakeLength+][] = g_arrSnake[g_iSnakeLength][]+;
             g_arrSnake[g_iSnakeLength+][] = g_arrSnake[g_iSnakeLength][];
             g_arrSnake[g_iSnakeLength+][] = g_arrSnake[g_iSnakeLength][];
         }
         else if (DOWN == g_arrSnake[g_iSnakeLength][])
         {
             g_arrSnake[g_iSnakeLength+][] = g_arrSnake[g_iSnakeLength][]-;
             g_arrSnake[g_iSnakeLength+][] = g_arrSnake[g_iSnakeLength][];
             g_arrSnake[g_iSnakeLength+][] = g_arrSnake[g_iSnakeLength][];
         }
         else if (LEFT == g_arrSnake[g_iSnakeLength][])
         {
             g_arrSnake[g_iSnakeLength+][] = g_arrSnake[g_iSnakeLength][];
             g_arrSnake[g_iSnakeLength+][] = g_arrSnake[g_iSnakeLength][]+;
             g_arrSnake[g_iSnakeLength+][] = g_arrSnake[g_iSnakeLength][];
         }
         else if (RIGHT == g_arrSnake[g_iSnakeLength][])
         {
             g_arrSnake[g_iSnakeLength+][] = g_arrSnake[g_iSnakeLength][];
             g_arrSnake[g_iSnakeLength+][] = g_arrSnake[g_iSnakeLength][]-;
             g_arrSnake[g_iSnakeLength+][] = g_arrSnake[g_iSnakeLength][];
         }
         g_iSnakeLength++;
         g_bIsProFood = true;
         g_iScore++;
     }

 }

 void PrintScore()                  //打印分数
 {
     COORD rd;
     //设置光标位置
     rd.X = ;
     rd.Y = ;
     SetConsoleCursorPosition(GetStdHandle(STD_OUTPUT_HANDLE), rd);
     printf("分数");

     rd.X = ;
     rd.Y = ;
     //设置光标位置
     SetConsoleCursorPosition(GetStdHandle(STD_OUTPUT_HANDLE), rd);
     //打印
     printf ("%d", g_iScore);
 }

main.c

 #include <stdio.h>
 #include <stdlib.h>
 #include <conio.h>
 #include <windows.h>
 #include <time.h>
 #include "GreedySnake.h"

 int main()
 {
     FirstPage();
     TestSpace();
     system("cls");
     SetSnakeRandPos();
     ShowBackground();

     while ()
     {
         system("cls");
         ProduceFood();
         SnakeGrowUp();
         ChangeDir();

         if(IsSnakeDie())
         {
             printf("snake die!\n");
             break;
         }

         SnakeMove();
         ShowBackground();
         PrintScore();

         Sleep();
     }
     system("pause");
     return ;
 }