/*dragon*/
/*Fernando Galindo Soria*/

#include <graphics.h>
#include <math.h>
#include <bios.h>

void dragon(int,int,int,int);
int ind;

void main()
{
  int gd=DETECT,gm;
  initgraph(&gd,&gm,"");
  ind=0;
  dragon(250,180,90,30);
  dragon(250,180,90,120);
  dragon(250,180,90,210);
  dragon(250,180,90,300);
  getch();
  closegraph();
}

void dragon(int x0,int y0,int l,int an)
{
  int x1,y1;
  if (bioskey(2)==0x04)return(0);
  if (l > ind )
  {
    x1=x0-(l*cos(an/57.29578));
    y1=y0-(l*sin(an/57.29578));
    line(x0,y0,x1,y1);
    dragon(x1,y1,l/2.8,an-70);
    dragon(x1,y1,l/2,an+20);
    dragon(x1,y1,l/1.4,an+85);
  }
}