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

void loadImage();
void releaseImage();
void addRandomNum(int n);
bool move(int direction);
void draw();
void upSlide();

#define DEVIDE 15
#define GRID_WIDTH 106

//图片
#define NUM_BLOCK 18
PIMAGE blockImgs[NUM_BLOCK], backgroundImg;

key_msg keyMsg;
int board[4][4];			//格子
//int emptyBlock = 16;	//空格子数
char ch;

void getRand()
{
	int x,y;
	do
	{
		x=rand()%4;
		y=rand()%4;
	}while(board[x][y]!=0);
	board[x][y]=1;
}
void loadImage()//图片载入 
{
	char imgName[40];
	//数字图片 初始化 
	for (int i = 1, num = 2; i < NUM_BLOCK; i++, num *= 2) 
	{
		blockImgs[i] = newimage();//声明 
		sprintf(imgName, "resource\\image\\block_%d.png", num);//字符串赋值 
		getimage(blockImgs[i], imgName);//图片对象赋值 
	}
	//底图 初始化 
	backgroundImg = newimage();
	getimage(backgroundImg, "resource\\image\\background.png");
}

void start()//初始化 
{
	initgraph(500, 500);//图形初始化 
	setbkcolor(WHITE);
	srand(time(0));//随机数初始化 
	loadImage();//图片载入 
	
	setfont(25,0,"幼圆");//(字体高度,字体宽度(为0即为自适应),字形)设置字体为25,幼圆字体
	setbkmode(TRANSPARENT); //设置文字背景色为透明(默认为有背景色)
}

bool judgeUpSlide()
{
	for(int i=3;i>=1;i--)
	{
		for(int j=4;j>=0;j--)
		{
			if(board[i][j]==0)
			{
				return true;
			}
			else if(board[i][j]==board[i-1][j])
			{
				return true;
			}
		}
	}
}
bool judgeLeftSlide()
{
	for(int i=3;i>=1;i--)
	{
		for(int j=4;j>=0;j--)
		{
			if(board[i][j]==0)
			{
				return true;
			}
			else if(board[i][j]==board[i-1][j])
			{
				return true;
			}
		}
	}
}
bool judgeDownSlide()
{
	for(int i=3;i>=1;i--)
	{
		for(int j=4;j>=0;j--)
		{
			if(board[i][j]==0)
			{
				return true;
			}
			else if(board[i][j]==board[i-1][j-1])
			{
				return true;
			}
		}
	}
}
bool judgeRightSlide()
{
	for(int i=3;i>=1;i--)
	{
		for(int j=4;j>=0;j--)
		{
			if(board[i][j]==0)
			{
				return true;
			}
			else if(board[i][j]==board[i+1][j+1])
			{
				return true;
			}
		}
	}
}
void upSlide()
{
	for(int i=3;i>=1;i--)
	{
		for(int j=3;j>=0;j--)
		{
			if((board[i][j]!=0)&&(board[i-1][j])==0)
			{
				board[i-1][j]=board[i][j];
				board[i][j]=0;
			}
			if((board[i][j]==board[i-1][j])&&(board[i][j]!=0))
			{
				board[i-1][j]=(board[i][j])+1;
				board[i][j]=0;
			}
		}
	}
}
void leftSlide()
{
	for(int i=3;i>=1;i--)
	{
		for(int j=3;j>=0;j--)
		{
			if((board[i][j]!=0)&&(board[i][j-1])==0)
			{
				board[i][j-1]=board[i][j];
				board[i][j]=0;
			}
			if((board[i][j]==board[i-1][j])&&(board[i][j]!=0))
			{
				board[i][j-1]=(board[i][j])-1;
				board[i][j]=0;
			}
		}
	}
}
void update()//数据更新 
{
	switch(keyMsg.key)
	{
		case 'W':
			if(judgeUpSlide())	upSlide();
			break;
		case 'A':
			if(judgeLeftSlide())	leftSlide();
			break;
		case 'S':
			if(judgeDownSlide())	//downSlide();
			break;
		case 'D':
			if(judgeRightSlide())	//rightSlide();
			break;
		default:break;
	}
}
void draw()//图形绘制 
{
	putimage_withalpha(NULL, backgroundImg, 0, 0);//绘制带透明通道的图像 

	for (int i = 0; i < 4; i++) 
	for (int j = 0; j < 4; j++) 
	{
		int x = (j + 1) * DEVIDE + j * GRID_WIDTH;
		int y =  (i + 1) * DEVIDE + i * GRID_WIDTH;

		if (board[i][j] != 0)
			putimage_withalpha(NULL, blockImgs[board[i][j]], x, y);	
	}
}

int main()
{
	start();//初始化 
	getRand();//产生随机数字 
	draw();//图形绘制 
	
	while(1)//!judgeOver())
	{
		while(kbmsg()) 
		{
			keyMsg = getkey();
			if ((keyMsg.msg == key_msg_down)&&((keyMsg.key=='A')||(keyMsg.key=='S')||
			(keyMsg.key=='W')||(keyMsg.key=='D')))
			{
				update();
				getRand();
				cleardevice();
				draw();
			}
		}
		delay_fps(60);
	}
	
	xyprintf(200,300,"GAME OVER");
	getch();
	return 0;
}