pickup pencircle scaled thick;
knot_pen := savepen;
pickup pencircle scaled thin;
thin_pen := savepen;

numeric	a[];
a1 := angle(sqwid#, sqht#);
a2 := 180 - a1;
a3 := 180 + a1;
a4 := 360 - a1;

pair	x[]ll, x[]rr, x[]c;
pair	y[]ll, y[]rr, y[]c;
path	parp_.l, parp_.r, parp_.c, parp_.ll, parp_.rr;

def llrrexp(expr max_num) =
  for ii := 0 upto max_num:
    z[ii].c = z[ii];
    z[ii].ll = indist[z[ii].l, z[ii].r];
    z[ii].rr = indist[z[ii].r, z[ii].l];
  endfor;
enddef;

def penstroke text t =
 forsuffixes e = c,l,r,ll,rr: parp_.e:=t; endfor
 if cycle parp_.l: cyclestroke_
 else:
	 forsuffixes e = c,l,r,ll,rr:
		if knotstyle.e = 2: 
			pickup knot_pen; draw parp_.e;
		elseif knotstyle.e = 1: 
			pickup thin_pen; draw parp_.e;
		elseif knotstyle.e = -1: 
			pickup thin_pen; undraw parp_.e;
		elseif knotstyle.e = -2: 
			pickup knot_pen; undraw parp_.e;
		fi
	 endfor
	 if knotstyle.solid = 1: 
		fill parp_.l -- reverse parp_.r -- cycle;
	 elseif knotstyle.solid = 2: 
		fill parp_.ll -- reverse parp_.rr -- cycle;
	 elseif knotstyle.solid = 3: 
		fill parp_.ll -- reverse parp_.l -- cycle;
		fill parp_.rr -- reverse parp_.r -- cycle;
	 fi
 fi
enddef;

input soloman
input found
input sides