public void SetOrientation(AxisOrientation orientation) { CT_Scaling ctScaling = this.GetCTScaling(); ST_Orientation stOrientation = XSSFChartAxis.fromAxisOrientation(orientation); if (ctScaling.IsSetOrientation()) { ctScaling.orientation.val = stOrientation; } else { this.GetCTScaling().AddNewOrientation().val = stOrientation; } }