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path: root/fonts/knot/do2knots.mf
blob: bfcece09b847a8d0decabbda4f05ce26bd0b79ba (plain)
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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:
		unfill parp_.ll -- reverse parp_.rr -- cycle;
		cullit;
		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
		cullit;
	fi
enddef;

input tri