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

int high,width;  //框的长和宽 
int ball_x,ball_y;  // 小球的位置 
int ball_vx,ball_vy;
int position_x,position_y;   //挡板的中心坐标 
int ridus;  // 挡板的半径 
int left,right;  //挡板到左右边框的距离 
int ball_number;
int block_x,block_y;   //砖块的坐标 
int score; 

void gotoxy(int x,int y)   //光标定义函数 
{
	HANDLE handle = GetStdHandle(STD_OUTPUT_HANDLE);
	COORD pos;
	pos.X=x;
	pos.Y=y;
	SetConsoleCursorPosition(handle,pos);
}
void startup()
{
	high=20;
	width=25;
	ball_x=0;
	ball_y=width/2;
	ball_vx=1;
	ball_vy=1;
	ridus=6;
	position_x = high;
	position_y = width/2;
	left=position_y - ridus;
	right=position_y + ridus;
	ball_number = 0;
	block_x=0;
	block_y=width/2+1;
	score=0;  // 计算消掉砖块数 
}

void show()
{
	gotoxy(0,0);
	int i,j;
	for(i=0;i<=high+1;i++)
	{
		for(j=0;j<=width;j++)
		{
			if((i==ball_x)&&(j==ball_y))
			    printf("0");
			else if(j==width)
			        printf("|");
			     else if(i==high+1)
			             printf("-");
			          else if((i==high) && (j>left) && (j<right))
			                   printf("#");
						   else if((i==block_x)&&(j==block_y))
							      printf("B"); 
							    else
							      printf(" ");
		}
		printf("\n");
	}
	printf("反弹小球数：%d\n",ball_number);
	printf("消掉的砖块数：%d\n",score);
}

void updataWithoutInput()
{
	if(ball_x == high-1)
	{
		if((ball_y>=left)&&(ball_y<=right))
		{
			ball_number++;
			printf("\a"); //响铃符，系统自带扬声器发出声音 
		}
		else
		{
			printf("游戏失败\n");
			system("pause");
			exit(0);
		}
    }
    
    if((ball_x==block_x) && (ball_y==block_y))
    {
    	score++;
		block_y=rand() % width;    //rand()产生随机数的随机函数 （伪随机数） 
	}
	
	ball_x = ball_x + ball_vx;
	ball_y = ball_y + ball_vy;
	
	if((ball_x==0)||(ball_x==high-1))
	   ball_vx = -ball_vx;
	if((ball_y==0)||(ball_y==width-1))
	   ball_vy = -ball_vy;
	Sleep(80);    //执行挂起一段时间，即让函数滞留0.08秒(小球移动的速度），其单位是毫秒 
}

void updataWithInput()
{
	char input;
	if(kbhit())   //检查当前是否有键盘输入，有则返回非0数，无则返回0  
	{
		input = getch();   //从键盘获取一个字符，然后继续； 
		if(input == 'a')
		{
			position_y--;
			left = position_y-ridus;
			right = position_y+ridus;
		}
		if(input == 'd')
		{
			position_y++;
			left = position_y-ridus;
			right = position_y+ridus; 
		}
	}
}
int main()
{
	startup();
	while(1)
	{
		show();
		updataWithoutInput();
		updataWithInput();
	}
	return 0;
}