Random Bouncing Ball Animation

Simple animation of random balls that bounces within the screen


Source:

#include<stdio.h>
#include<graphics.h>
#include<conio.h>
#include<dos.h>
#include<math.h>

void drawBall(struct ball *b, int color);

struct ball{
int x, y;
int dx, dy;
int radius;
};

void main()
{
  int gd=0, gm=VGAHI;
  int i;
  struct ball b[10];
  initgraph(&gd, &gm, "");

  for(i=1;i<=15;i++){
 b[i].radius = rand()%20;
 b[i].x=rand()%getmaxx();
 b[i].y=rand()%getmaxy();
 b[i].dx=2;
 b[i].dy=4;
  }

  while(!kbhit())
  {
 delay(5);
 cleardevice();
 for(i=1;i<=15;i++)
 drawBall(&b[i],i);
  }
closegraph();

}

void drawBall(struct ball *b, int color){
 setfillstyle(1,color);
 setcolor(color);
 fillellipse(b->x, b->y, b->radius, b->radius);
 if(b->x+b->radius > getmaxx() || b->x-b->radius<0)
 b->dx = -b->dx;
 if(b->y+b->radius > getmaxy() || b->y-b->radius<0)
 b->dy = -b->dy;

 b->x+=b->dx;
 b->y+=b->dy;
}

Output: