//
// Pilota il calcolo di una stella intrecciata
//
efun=function(ls,ns){var k=ns,dd;
   var lpath=document.getElementsByTagName("path");
   var intreccio=function(ra,np,ns){
       var k,kp,ks,r=[0,0],dd=" ",xr=0,yr=0;
       var h,i,ip=[0,0,1,1,0],x=[0,0],y=[0,0];
       var j,jp=[0,1,1,0,0],xa,ya,w;
       kp=Math.max(3,Math.round(np));
       ks=Math.min(kp-1,Math.max(1,Math.round(ns)));
       r[0]=Math.max(1,Math.abs(ra));
       w=2*Math.PI/kp;r[1]=r[0]*Math.cos(w);
       for(k=0;kp>k;k++){
          x[0]=Math.sin(w*k);y[0]=-Math.cos(w*k);
          x[1]=Math.sin(w*(k+ks));
          y[1]=-Math.cos(w*(k+ks));
          for(h=0;5>h;h++){i=ip[h];j=jp[h];
             xa=x[j]*r[i];ya=y[j]*r[i];
             if(h==0){dd+=" m "+Math.round(xa-xr)+
                " "+Math.round(ya-yr)+" l "}
             else{dd+=Math.round(xa-xr)+" "+
                Math.round(ya-yr)+" ";}
             xr=xa;yr=ya;}}
       return dd;}
   dd=intreccio(1000,17,5);
   ls[k].innerHTML=dd;k++;
   ls[k].innerHTML="Qui in efun(ls,ns)"+
       " ha calcolato con intreccio(ra,np,ns) !";
   lpath[0].setAttribute("d"," M 1050 1050 "+dd);
   }
//