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          px = x.call(hexbin, point, i) / dx - (pj & 1 ? .5 : 0), pi = Math.round(px),

          py1 = py - pj;

      if (Math.abs(py1) * 3 > 1) {

        var px1 = px - pi,

            pi2 = pi + (px < pi ? -1 : 1) / 2,

            pj2 = pj + (py < pj ? -1 : 1),

            px2 = px - pi2,

            py2 = py - pj2;

        if (px1 * px1 + py1 * py1 > px2 * px2 + py2 * py2) pi = pi2 + (pj & 1 ? 1 : -1) / 2, pj = pj2;

      }

      var id = pi + "-" + pj, bin = binsById[id];

      if (bin) bin.push(point); else {

    var lfocx = site.x, lfocy = site.y, plby2 = lfocy - directrix;

    if (!plby2) return lfocx;

    var hl = lfocx - rfocx, aby2 = 1 / pby2 - 1 / plby2, b = hl / plby2;

    if (aby2) return (-b + Math.sqrt(b * b - 2 * aby2 * (hl * hl / (-2 * plby2) - lfocy + plby2 / 2 + rfocy - pby2 / 2))) / aby2 + rfocx;

    return (rfocx + lfocx) / 2;

  }

  function d3_geom_voronoiRightBreakPoint(arc, directrix) {