code: function (intersections, iMap) {
                  for (var i = 0; i < intersections.length - 1; i += 2) {
                      var i0 = intersections[i];
                      var i1 = intersections[i + 1];
  
                      var iEnd0 = iMap.get(i0.indexEnd);
                      var iStart0 = iMap.get(i0.indexStart);
                      var iEnd1 = iMap.get(i1.indexEnd);
                      var iStart1 = iMap.get(i1.indexStart);
  
                      iEnd0.linkTo = i1.indexStart;
                      iStart0.linkTo = i1.indexEnd;
                      iEnd1.linkTo = i0.indexStart;
                      iStart1.linkTo = i0.indexEnd;
                  }
              }
docs: Internal. Applications should not call this method.
  Links adjacents pairs of intersection by index
  @param {Array} intersections
  @param {HashMap} iMap