code: function (lineData) {
                      return function (e, shape, chart, series) {
                          d3.select(shape).style("opacity", (series.lineMarkers || lineData.data.length < 2 ? dimple._helpers.opacity(e, chart, series) : 0));
                          dimple._removeTooltip(e, shape, chart, series);
                      };
                  }
docs: Get the position data