Revolving Circles Animation

#include<stdio.h>
#include<graphics.h>
#include<dos.h>
#include<conio.h>
#include<math.h>
#define pie 3.14

void init_graph();
void bresenham_circle(const int,const int,const int,int);

void main( )
{
 int h=0;
 int k=0;
 int r=150;
 int rs=70;
 int hs=r-rs;
 int ks=0;
 int rk=30;
 int hk=rs-rk;
 int kk=0;
 int rl=10;
 int hl=rk-rl;
 int kl=0;
 int angs=0;
 int angk=0;
 int angl=0;
 char ch;
 init_graph();

 do
 {
 bresenham_circle(h,k,r,GREEN);
 bresenham_circle(hs,ks,rs,BLACK);
 bresenham_circle(hk,kk,rk,BLACK);
 bresenham_circle(hl,kl,rl,BLACK);
 hs = h + ((r-rs)*cos(pie*angs/180));
 ks = k + ((r-rs)*sin(pie*angs/180));
 hk = hs + ((rs-rk)*cos(pie*angk/180));
 kk = ks + ((rs-rk)*sin(pie*angk/180));
 hl = hk + ((rk-rl)*cos(pie*angl/180));
 kl = kk + ((rk-rl)*sin(pie*angl/180));
 bresenham_circle(hs,ks,rs,RED);
 bresenham_circle(hk,kk,rk,BLUE);
 bresenham_circle(hl,kl,rl,YELLOW);
 angs = (angs+1)%360;
 angk = (angk+2)%360;
 angl = (angl+4)%360;
 delay(2);
 }while(!kbhit());
 getch();
}

void init_graph()
{
 int gdriver = DETECT, gmode, errorcode;
 initgraph(&gdriver, &gmode, "");
 errorcode = graphresult();
 if (errorcode != grOk)  /* an error occurred */
 {
   printf("Graphics error: %s\n", grapherrormsg(errorcode));
   printf("Press any key to halt:");
   getch();
 }
}



void bresenham_circle(const int h,const int k,const int r,int col)
{
 int x=0;
 int y=r;
 int p=(3-(2*r));
 do
 {
  putpixel((getmaxx()/2)+(h+x),(getmaxy()/2)-(k+y),col);
  putpixel((getmaxx()/2)+(h+y),(getmaxy()/2)-(k+x),col);
  putpixel((getmaxx()/2)+(h+y),(getmaxy()/2)-(k-x),col);
  putpixel((getmaxx()/2)+(h+x),(getmaxy()/2)-(k-y),col);
  putpixel((getmaxx()/2)+(h-x),(getmaxy()/2)-(k-y),col);
  putpixel((getmaxx()/2)+(h-y),(getmaxy()/2)-(k-x),col);
  putpixel((getmaxx()/2)+(h-y),(getmaxy()/2)-(k+x),col);
  putpixel((getmaxx()/2)+(h-x),(getmaxy()/2)-(k+y),col);
  x++;
  if(p<0)
   p+=((4*x)+6);
  else
  {
   y--;
   p+=((4*(x-y))+10);
  }
 }while(x<=y);

}