handleXForColumns = function handleXForColumns(x) {
            if (w.globals.isXNumeric) {
              x = cx - bw / 2;
            } else {
              if (_this.isVerticalGroupedRangeBar) {
                x = cx + bw / 2;
              } else {
                x = cx - ttCtx.dataPointsDividedWidth + bw / 2;
              }
            }
            return x;
          }
handle tooltips for bar/column charts