#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <graphics.h>
struct POINT { int x,y; };
void linetheta(float ang, float l, float *x,float *y){
  float k1,k2,rad=3.14159/180;
  k1=l*cos(ang*rad); k2=l*sin(rad*ang); *x+=k1; *y+=k2; lineto(*x,*y);
}

void main() {
  int Drv,mode,i,j,c;
  struct POINT p1;
  float sta,ang,x,y,ol,l,n;
  char aa;

  printf("give me the circulus point -->"); scanf("%d %d",&p1.x,&p1.y);
  printf("give me the length of line -->"); scanf("%f",&l); ol=l;
  printf("give me the decrement -->"); scanf("%f",&n);
  printf("give me the starting angle -->"); scanf("%f",&ang);
  Drv=DETECT; initgraph(&Drv,&mode,""); c=1;

  while (1) {
    c=(c+2)%16; l=ol; sta=0.0; setcolor(c); x=p1.x; y=p1.y; moveto(x,y);
    c=(c+1)%16;
    while (l > 10.0) {
      setcolor(c); linetheta(sta,l,&x,&y); sta=fmod(sta+ang,360.0); l-=n;
      c=(c+1)%16;
    }
    while ((aa=kbhit()) != 0)  break;
    if (aa != 0) break;
  }
  getche(); closegraph();
}