#include<stdio.h>
#include<stdlib.h>
#include<Windows.h>       /*需要使用system("cls")清屏函数*/
#include<conio.h>         /*非标准库函数，VS中自带，需要使用_getch()函数获取输入*/
#include<time.h>          /*使用随机数函数需要使用time()函数*/

#define MAXX 10000                /* 定义游戏最大界面宽度坐标值 */
#define MAXY 10000                /* 定义最大高度 */

int speed = 10;                    /* 设置蛇移动速度 */
int mapArr[MAXX][MAXY];            /* 保存界面坐标值的二维数组 */
int inputX = 50, inputY = 20;      /* 默认游戏界面宽度和高度 */
int randX = -1, randY = -1;        /* 生成的随机食物的坐标值 */
int foodFlag = 0;                  /* 判断是否更新食物 */
int sx = 1, sy = 1;                  /* 设置蛇身坐标值 */
int l = 0;                        /* 蛇身长度 */
int *body[MAXX * MAXY];            /* 储存蛇身的指针数组 */
char input = '6';                   /* 默认移动方向 */
int overFlag = 1;                  /* 判断游戏结束，撞墙或吃到自己 */
int moveX = 1, moveY = 1;          /* 游戏开始的动画效果坐标值 */
int moveFlag = 0;                  /* 开始动画的循环判断 */

void InitMap();                   /* initialize the background coordinate system */
void PrintMap();                  /* print every point in the arr mapArr to the screen */
void StartMsg();                  /* start message */
void GetSet();                    /* judge whether to edit the game setting */
void SetRandNum();                /* set a random 'food' point in the screen */
void SetSnakeNum();               /* the most complex and important algorithm of this game */
void EatFood();                   /* judge when to eat food and elongate the body */
void StartGame();                 /* start the game */
void SetMoveNum();                /* algorithm of the start animation, some complex */
void JudgeEnd();                  /* judge the end of the animation and loop again*/
void StartView();                 /* start the start animation view */

#include<stdio.h>
#include<stdlib.h>
#include<Windows.h>                /* use the function 'system("cls")' to clear screen */
#include<conio.h>                 /* use the function '_getch()' to get input */
#include<time.h>                  /* the random function need the 'time()' function */
#include "public-fun.h"#define MAXX 10000                /* define the max width of game space */
#define MAXY 10000                /* define the max height */void InitMap();                   /* initialize the background coordinate system */
void PrintMap();                  /* print every point in the arr mapArr to the screen */
void StartMsg();                  /* start message */
void GetSet();                    /* judge whether to edit the game setting */
void SetRandNum();                /* set a random 'food' point in the screen */
void SetSnakeNum();               /* the most complex and important algorithm of this game */
void EatFood();                   /* judge when to eat food and elongate the body */
void StartGame();                 /* start the game */
void SetMoveNum();                /* algorithm of the start animation, some complex */
void JudgeEnd();                  /* judge the end of the animation and loop again*/
void StartView();                 /* start the start animation view */int speed = 10;                   /* default snake move speed */
int mapArr[MAXX][MAXY];            /* arr to store the point in the screen */
int inputX = 50, inputY = 20;      /* default width and height */
int randX = -1, randY = -1;        /* set a random food point in the background */
int foodFlag = 0;                  /* judge when to change random food point*/
int sx = 1, sy = 1;               /* body x, y point */
int l = 0;                     /* body lenth */
int *body[MAXX * MAXY];             /* body array pointer */
char input = '6';                    /* default direction */
int overFlag = 1;                 /* judge when the game over, hit wall or eat self*/
int moveX = 1, moveY = 1;         /* start move effect */
int moveFlag = 0;                /* restart the loop effection */void GetSet()
{printf("\n");printf("请输入游戏空间的宽度：\n(Please enter the width of game space:)\n");scanf_s("%d", &inputX); printf("\n");printf("请输入游戏空间的高度：\n(Please enter the height of game space:)\n");scanf_s("%d", &inputY);printf("\n");printf("请输入游戏速度（1 到 n，1 最慢）：\nPlease enter the speed of snake moving:(1 is slowest)\n");scanf_s("%d", &speed);
}void InitMap()
{int x, y;for (y = 0; y < inputY; y++){for (x = 0; x < inputX; x++){if ((x == 0) || (x == inputX - 1) || (y == 0) || (y == inputY - 1)){mapArr[x][y] = 1;}else{mapArr[x][y] = 0;}}}
}void PrintMap()
{int x, y;for (y = 0; y < inputY; y++){for (x = 0; x < inputX; x++){switch (mapArr[x][y]){case 0:printf(" ");break;case 1:printf("+");break;case 2:printf("*");break;case 3:printf("@");}}printf("\n");}
}void StartMsg()
{printf("'2(top)', '8(down)', '4(left)', 6(right)' 或 \n'w(top)', 'a(left)', 's(down)', 'd(right)'\n控制方向(control the direction)\n");
}void SetRandNum()
{srand(time(0));while ((mapArr[randX + 1][randY + 1] != 0) && (foodFlag == 0)){randX = rand() % (inputX - 2), randY = rand() % (inputY - 2);}mapArr[randX + 1][randY + 1] = 3;    /* set foot number 3 */foodFlag = 1;
}void SetSnakeNum()
{if (_kbhit())         /* if there is an input, get it; if not, go on   */{int a = _getch();       switch (input){case '2':case 'w':if (a == '4' || a == '6' || a == 'a' || a == 'd' || a == '2' || a == 'w')input = a;break;case '8':case 's':if (a == '4' || a == '6' || a == 'a' || a == 'd' || a == '8' || a == 's')input = a;break;case '4':case 'a':if (a == '2' || a == '8' || a == 'w' || a == 's' || a == '4' || a == 'a')input = a;break;case '6':case 'd':if (a == '2' || a == '8' || a == 'w' || a == 's' || a == '6' || a == 'd')input = a;break;}}switch (input)             /* judge the direction by value of input */{case '2':                 /* up */case 'w':sy--;break;case '8':                   /* down */case 's':sy++;break;case '4':                   /* left */case 'a':sx--;break;case '6':                 /* right */case 'd':sx++;break;}int i;for (i = l; i != 0; i--)           /*  every point's address of body move back one point */{body[i] = body[i - 1];*body[i] = 2;                 /* change value by pointer */}body[0] = &mapArr[sx][sy];if ((*body[0] == 1) || (*body[0] == 2))    /* judge when the snake hit the wall or eat itself */{overFlag = 0;}*body[0] = 2;              /* assign the head of snake by pointer */
}void EatFood()
{if (*body[0] == 3){l++;foodFlag = 0;}
}void StartGame()
{sx = 1;sy = 1;l = 0;input = '6';int j;for (j = 0; j < l; j++)             /* assign the snake body initial address value*/{body[j] = &mapArr[sx - j][sy];   }while (overFlag)    /* loop until the game over */{InitMap();SetSnakeNum();SetRandNum();EatFood();PrintMap();StartMsg();Sleep(1000/speed);system("cls");}
}void SetMoveNum()
{/* x move 1 -- (X - 2 ); y move 1 -- (Y - 2) *//* move x from left to right */if ((moveY == 1 + moveFlag) && (moveX < inputX - 2 - moveFlag)){mapArr[moveX][moveY] = 2;moveX++;}/* move y from top to buttom */else if ((moveX == inputX - 2 - moveFlag) && (moveY < inputY - 2 - moveFlag)){mapArr[moveX][moveY] = 2;moveY++;}/* move x from right to left */else if ((moveY == inputY - 2 - moveFlag) && (moveX > 1 + moveFlag)){mapArr[moveX][moveY] = 2;moveX--;}/* move y from buttom to top */else if ((moveX == 1 + moveFlag) && (moveY > 1 + moveFlag)){mapArr[moveX][moveY] = 2;moveY--;if (moveY == 2 + moveFlag)     /* judge when to jump to a deeper layer */{moveFlag++;}}
}void JudgeEnd()
{int i, j;int tmp = 1;for (j = 0; j < inputY; j++){for (i = 0; i < inputX; i++){if (mapArr[i][j] == 0)goto out;}}moveX = 1, moveY = 1;InitMap();moveFlag = 0;
out:;
}void StartView()
{moveX = 1, moveY = 1, moveFlag = 0;int startFlag = 1;InitMap();while (startFlag){SetMoveNum();PrintMap();printf("按任意键开始游戏：\n(Press any key to start game: )\n");Sleep(10);system("cls");JudgeEnd();if (_kbhit()){int c = _getch();if ((c != '2') && (c != 'w') && (c != '8') && (c != 's') && (c != '4') && (c != 'a') && (c != '6') && (c != 'd'))startFlag = 0;}}
}int main()             /* main function */
{while (1){printf("是否修改设置（修改输入“y”,否则按任意键）：\nEdit the game setting or not ? (Press 'y' to edit, or press another key to go on:)\n");if (_getch() == 'y'){GetSet();          }StartView();  /* an animation before game start */StartGame();printf("Game Over !!!\n游戏结束，按任意键继续：\n(Press any key to restart: )\n");_getch();overFlag = 1;   /* restart the game by the flag */system("cls");}
}