C语言“贪吃蛇”小游戏二次开发

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

void welcome();  //欢迎界面 
void border();  //创建边界 
void Pos(int x, int y);  //改变控制台光标位置 
void getRandomPos(int *x, int *y);  //获取随机坐标
void initSnake();  //蛇的初始化
void createFood();  //生成食物
int inSnake(int x, int y);  //判断(x, y)是否在蛇上，1表示在，0表示不在 
void snakeMove();  //蛇的移动 
int getDirection();  //获取移动方向，0、1、2、3分别代表上、下、左、右 

typedef struct Node{
	int x;
	int y;
	Node* next;
}node;

//全局变量
node* head;  //蛇头
node food;  //食物 
int reCreateFood;  //判断食物是否被吃掉
int fail;  //如果蛇头碰到蛇身或边界则失败 
int score, add = 10;  //定义分数和每个食物的分数 
int dx[4] = {0, 0, -1, 1}, dy[4] = {-1, 1, 0, 0};  //(dx[0], dy[0])为(0, 1)，即代表“上”
int d = -1;  //表示蛇前进的方向，与上一行对应，0为上，1为下，2为左，3为右
//开局时初始化为-1，表示还未按方向键 

int main(){
	welcome();  //欢迎界面 
	border();  //创建边界 
	initSnake();  //蛇的初始化 
	createFood();  //生成食物 
	
	//fail ！= 0就一直进行 
	while(1){
		if(fail) break;
		//食物被吃掉需要重新生成 
		if(reCreateFood){
			createFood();
			reCreateFood = 0;
		}
		snakeMove();  //蛇的移动 
		Sleep(500);  //程序暂停500毫秒，注释掉运行一下就懂了
		//获取新的方向 
		d = getDirection(); 
	}
	
	//这个也是注释掉对比一下就懂了 
	Pos(0, 24);
	printf("\n");
	
	return 0;
}

void welcome(){
	system("mode con cols=100 lines=30");
	system("cls");
	
	Pos(38,6);
	printf("welcome come to SnakeGame\n");
	Pos(38,8);
	printf("↑↓←→control direction\n");
	Pos(45,10);
	printf("ESC For Exit\n");
	Pos(42,12);
	printf("Enter For Begin\n");
	getchar();
	system("cls");
}

void border(){  //创建以(0, 0), (59， 25)为顶点的矩形边界
	for(int i = 0; i < 60; i ++ ){
		Pos(i, 0);  //上行 
		printf("▇");
		Pos(i, 25);  //下行 
		printf("▇"); 
	} 
	
	for(int i = 1; i < 25; i ++ ){
		Pos(0, i);  //左列 
		printf("▇");
		Pos(59, i);  //右列 
		printf("▇");
	}
}

void Pos(int x, int y){
	COORD pos;  //位置坐标 
	pos.X = x;
	pos.Y = y;
	
	HANDLE handleOutput = GetStdHandle(STD_OUTPUT_HANDLE);  //获取输出句柄 
	SetConsoleCursorPosition(handleOutput, pos);   //定位 
}

void getRandomPos(int *x, int *y){
	srand((unsigned int)time(NULL));
    *x = rand() % 58 + 1;
    *y = rand() % 24 + 1;
}

void initSnake(){ 
	head = (node*)malloc(sizeof(node));
	//保证在边界内
	head->x = rand() % 58 + 1;   
	head->y = rand() % 24 + 1;
	head->next = NULL;
	
	Pos(head->x, head->y);
	printf("*");
}

void createFood(){
	int x, y;
	getRandomPos(&x, &y);
	if(inSnake(x, y)) createFood();  //重新生成
	food.x = x;
	food.y = y;
	Pos(x, y);
	printf("$");
}

int inSnake(int x, int y){
	node* p = head->next;
	while(p){  //从头遍历蛇身 
		if(x == p->x && y == p->y)
			return 1;
		p = p->next;
	}
	return 0;
} 

void snakeMove(){
	//刚开局未按方向键的情况 
	if(d == -1)
		while(d == -1) d = getDirection();

	node* newHead = (node*)malloc(sizeof(node));
	newHead->x = head->x + dx[d];
	newHead->y = head->y + dy[d];
	newHead->next = head;
	head = newHead;
	
	node* p = head;
	if(inSnake(p->x, p->y) || (p->x == 0 || p->x == 59 || p->y == 0 || p->y == 25))
		fail = 1;
	else if(p->x != food.x || p->y != food.y){
		Pos(p->x, p->y);
		printf("*");
		
		while(p->next->next) p = p->next;
		Pos(p->next->x, p->next->y);
		printf(" ");
		p->next = NULL;
	} 
	else{
		reCreateFood = 1;
		score += add;
		Pos(p->x, p->y);
		printf("*");
	}
	Pos(61, 25);
	printf("您的得分为：%d", score);
}

int getDirection(){
	//不能往反方向走 
	if((GetAsyncKeyState(VK_UP) & 0x8000) && d != 1) d = 0;
	else if((GetAsyncKeyState(VK_DOWN) & 0x8000) && d != 0) d = 1;
	else if((GetAsyncKeyState(VK_LEFT) & 0x8000) && d != 3) d = 2;
	else if((GetAsyncKeyState(VK_RIGHT) & 0x8000) && d != 2) d = 3;	
	return d; 
}