#include <stdlib.h>
#include <math.h>
#include <conio.h>
#include <graphics.h>
void main()
{
  struct point { int x,y; } p1, pbe;
  int lon,sho,Drive, Mode;
  float i, tx, ty, x, y;
  int j;

  printf("give me the circle point --> "); scanf("%d %d",&p1.x,&p1.y);
  printf("input the long and shor axis --> "); scanf("%d %d",&lon,&sho);
  Drive=DETECT; initgraph(&Drive, &Mode, ""); setcolor(14);
  line(0,p1.y,639,p1.y); line(p1.x,0,p1.x,479);

  for (j=0,i=0; i<=6.2830; i+=0.05) {
    tx=lon/cos(i); ty=sho*tan(i);
    x=p1.x+tx; y=p1.y-ty;
    if ((x < 0) || (x > 639) || ( y < 0) || (y > 479)) { j=0; continue; }
    if (j == 0) { moveto(x,y); j=1; }
    else lineto(x,y);
    delay(2000);
     /* putpixel(x,y,6); */
  }
  getche(); closegraph();
}