code: function($super, data, fieldInfo, properties) {
              $super(data, fieldInfo, properties);
              this.data = data;
              this.fieldInfo = fieldInfo;
              if(!this.chartIsEmpty) {
                  this.calculateYExtremes();
                  // guessing the bottom spacing based on the data usually gets us pretty close,
                  // we'll go through and finalize this after the chart draws
                  this.bottomSpacing = this.guessBottomSpacing(data);
              }
          }
docs: override