code: function (d, chart, series) {
              var returnHeight = 0;
              if (series.y._hasTimeField()) {
                  returnHeight = series.y.floatingBarWidth;
              } else if (series.y.measure !== null && series.y.measure !== undefined) {
                  returnHeight = Math.abs(series.y._scale(d.y) - series.y._scale((d.y <= 0 ? d.y + d.height : d.y - d.height)));
              } else {
                  returnHeight = d.height * ((chart._heightPixels() / series.y._max) - (dimple._helpers.yGap(chart, series) * 2)) - (dimple._helpers.yClusterGap(d, chart, series) * 2);
              }
              return returnHeight;
          }
docs: Calculate the height for bar type charts