EasyX实现圆球的反弹

#include "stdafx.h"
#include  
#include  
int main() 
{ 
  initgraph(640,480);
  while(1)
  {
  for(int x=100;x<480;x+=20)
  {
	  setcolor(YELLOW);//绘制黄线，绿色填充
	  setfillcolor(GREEN);
	  fillcircle(x,x,20);     //填充
	  Sleep(1000);
	  setcolor(BLACK);
	  setfillcolor(BLACK);
	  fillcircle(x,x,20);
	  if(x>440)
	  {
		  int i=1;
		  for(int x=480;x<640;x+=20)
		  {
	  setcolor(YELLOW);//绘制黄线，绿色填充
	  setfillcolor(GREEN);
	  fillcircle(x,x-40*i,20);     //填充
	  Sleep(1000);
	  setcolor(BLACK);
	  setfillcolor(BLACK);
	  fillcircle(x,x-40*i,20);
	  i++;
	  if(x>600)
	  {
		  int j=0;
		  for(int x=600;x>320;x-=20)
		  {
	  setcolor(YELLOW);//绘制黄线，绿色填充
	  setfillcolor(GREEN);
	  fillcircle(x,260-20*j,20);     //填充
	  Sleep(1000);
	  setcolor(BLACK);
	  setfillcolor(BLACK);
	  fillcircle(x,260-20*j,20);
	  j++;
	  if(x<370)
	  {
		  int b=0;
		  int k=0;
		  for(int x=287;x>100;x-=93)
		  {
	  setcolor(YELLOW);//绘制黄线，绿色填充
	  setfillcolor(GREEN);
	  fillcircle(x,60+20*k,20);     //填充
	  Sleep(1000);
	  setcolor(BLACK);
	  setfillcolor(BLACK);
	  fillcircle(x,60+20*k,20);
		  k++;
		  if(k>2)
			  b=1;
		  }
	  if(b=1)
		  break;
	  }
		  }
	  }
  }
  }
  }
  }
  getch();
  closegraph();

 return 0;
}