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#include <graphics.h>
#include<time.h> //包含随机数，时间函数
int high=600,width=800;
struct ballon
{
	float x;
	float y;
	int r;
	float vx;
	float vy;
	float g;
	unsigned int R_color,G_color,B_color;
}ball[1000000];
float ranx(int min,int max)
{
	float h;
	h=rand()%(max-min+min);
	return h;
}
void startup()
{
		srand(time(0));//随机种子函数        
    for(int i =0;i<100;i++)
    {
        ball[i].x = ranx(ball[i].r+1,width-ball[i].r-1);
        ball[i].y = ranx(ball[i].r+1,high-ball[i].r-1);
        ball[i].vx = ranx(2,3);
        ball[i].vy = ranx(2,5);
        ball[i].r = 10+rand()%10;
		ball[i].R_color = ranx(10,255);
        ball[i].G_color = ranx(10,255);
        ball[i].B_color = ranx(10,255); 
	}
	initgraph(800, 600);
	setcolor(WHITE);
	setbkcolor(WHITE);	
	setfillcolor(YELLOW); 
}
void update()
{
	for(int i=0;i<100;i++)
	{
		ball[i].vy=ball[i].vy+ball[i].g;
			ball[i].vx=ball[i].vx+ball[i].g;
			ball[i].y+=ball[i].vy;
			ball[i].x+=ball[i].vx;
			if(ball[i].y>=high-ball[i].r)
			{
				ball[i].vy=-ball[i].vy;
			}
			if(ball[i].y<=ball[i].r)
			{
				ball[i].vy=-ball[i].vy;
			}
			if((ball[i].x<=ball[i].r)||(ball[i].x>=width-ball[i].r))
			{
				ball[i].vx=-ball[i].vx;
			}
	}
}
void drawball()
{
	for(int i=0;i<100;i++)
	{
		fillellipse(ball[i].x,ball[i].y,ball[i].r,ball[i].r);
		setfillcolor(EGERGB(ball[i].R_color, ball[i].G_color, ball[i].B_color));
		Sleep(5); 
		cleardevice();
	}
int main()
{
	getch();				
	closegraph();       
	return 0;
}