Light House : "Animation"

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

int xmid,ymid,xb,yb;
int a=300,b=120;

void initialize()
{
 int gd=DETECT,gm;
 initgraph(&gd,&gm,"c:\\tcc");
 cleardevice();
 xmid=getmaxx()/2;
 ymid=getmaxy()/2;
}

void ground()
{
 setcolor(LIGHTBLUE);
 line(0,ymid+100,640,ymid+100);
}

void lighthouse()
{
 setcolor(BROWN);
 line(xmid-40,ymid+99,xmid+40,ymid+99);
 line(xmid-25,ymid-100,xmid+25,ymid-100);
 line(xmid-40,ymid+99,xmid-25,ymid-100);
 line(xmid+40,ymid+99,xmid+25,ymid-100);
 rectangle(xmid-10,ymid-115,xmid+10,ymid-100);
}

void karakkam()
{
 int angle,x,y,c=0;
 float angle_rad;
 xb=xmid,yb=ymid-107;
 angle=0;
 while(!kbhit())
 {
  lighthouse();
  angle_rad=(3.14/180)*angle;

  //parametric equation of ellipse
  x=xb+a*cos(angle_rad);//a=xmajor
  y=yb-b*sin(angle_rad);//b=yminor

  setcolor(YELLOW);
  line(xb,yb,x,y);
  delay(30);
  if(c>=20)
  {
   lighthouse();
   angle_rad=(3.14/180)*(angle-20);
   x=xb+a*cos(angle_rad);
   y=yb-b*sin(angle_rad);
   setcolor(BLACK);
   line(xb,yb,x,y);
  }
  else
  c++;

  angle++;
 }
}

void main()
{
 initialize();
 ground();
 lighthouse();
 karakkam();
 getch();
 closegraph();
}