function link() {
  var source = function(d) { return d.source; },
      target = function(d) { return d.target; },
      angle = function(d) { return d.angle; },
      startRadius = function(d) { return d.radius; },
      endRadius = startRadius,
      arcOffset = -Math.PI / 2;

  function link(d, i) {
    var s = node(source, this, d, i),
        t = node(target, this, d, i),
        x;
    if (t.a < s.a) x = t, t = s, s = x;
    if (t.a - s.a > Math.PI) s.a += 2 * Math.PI;
    var a1 = s.a + (t.a - s.a) / 3,
        a2 = t.a - (t.a - s.a) / 3;
    return "M" + Math.cos(s.a) * s.r0 + "," + Math.sin(s.a) * s.r0
        + "L" + Math.cos(s.a) * s.r1 + "," + Math.sin(s.a) * s.r1
        + "C" + Math.cos(a1) * s.r1 + "," + Math.sin(a1) * s.r1
        + " " + Math.cos(a2) * t.r1 + "," + Math.sin(a2) * t.r1
        + " " + Math.cos(t.a) * t.r1 + "," + Math.sin(t.a) * t.r1
        + "L" + Math.cos(t.a) * t.r0 + "," + Math.sin(t.a) * t.r0
        + "C" + Math.cos(a2) * t.r0 + "," + Math.sin(a2) * t.r0
        + " " + Math.cos(a1) * s.r0 + "," + Math.sin(a1) * s.r0
        + " " + Math.cos(s.a) * s.r0 + "," + Math.sin(s.a) * s.r0;
  }

  function node(method, thiz, d, i) {
    var node = method.call(thiz, d, i),
        a = +(typeof angle === "function" ? angle.call(thiz, node, i) : angle) + arcOffset,
        r0 = +(typeof startRadius === "function" ? startRadius.call(thiz, node, i) : startRadius),
        r1 = (startRadius === endRadius ? r0 : +(typeof endRadius === "function" ? endRadius.call(thiz, node, i) : endRadius));
    return {r0: r0, r1: r1, a: a};
  }

  // Expose selected locals
  ["source","target","angle","startRadius","endRadius"].forEach(function(fn) {link[fn] =  function(_){if(!arguments){return eval(fn)};eval(fn+"=_");return link}})

  return link;
}