#include <stdio.h>
#include <stdlib.h>
#include <conio.h>
#include <windows.h>
#include <unistd.h>

int high,width;
int ball_x ,ball_y;
int ball_vx, ball_vy;
int position_x,position_y;
int ridus;
int left, right;
int ball_number;
int block_x, block_y;
int score;

void gotoxy (int x, int y)
{
	HANDLE handle = GetStdHandle(STD_OUTPUT_HANDLE);
	COORD pos;
	pos.X = x;
	pos.Y = y;
	SetConsoleCursorPosition(handle, pos); 
}

void startup()
{
	high = 15;
	width = 20;
	ball_x = 0;
	ball_y = width / 2;
	ball_vx = 1;
	ball_vy = 1;
	ridus = 5;
	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;
}

void show()
{
	gotoxy(0,0);
	int i, j;
	for(i = 0; i < high; 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 updateWithoutInput()
{
	if(ball_x == high - 1)
	{
		if((ball_y >= left) && (ball_y <= right))
		{
			ball_number++;
			printf("\a");
			ball_y = ball_y + rand() % 4 - 2;
		}
		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;
	}
	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;
		
	usleep(80000);
}

void updateWithInput()
{
	char input;
	if(kbhit())
	{
		input = getch();
		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();
		updateWithoutInput();
		updateWithInput();
	}
	return 0;
}