Implementing Error bars

EPPlus/Drawing/Chart/ExcelBarChartSerie.cs

@@ -26,8 +26,9 @@
  * 
  * Author							Change						Date
  * ******************************************************************************
- * Jan Källman		Initial Release		        2009-10-01
- * Jan Källman		License changed GPL-->LGPL 2011-12-16
+ * Jan Källman		Initial Release		                        2009-10-01
+ * Jan Källman		License changed GPL-->LGPL                  2011-12-16
+ * Kris Wragg       Added error bar functionality               2019-08-25
  *******************************************************************************/
 using System;
 using System.Collections.Generic;
@@ -79,5 +80,45 @@ internal bool InvertIfNegative
                 SetXmlNodeBool(INVERTIFNEGATIVE_PATH, value);
             }
         }
+
+        /// <summary>
+        /// Returns the error bar or creates it if it does not exist
+        /// </summary>
+        public ExcelChartErrorBar ErrorBar
+        {
+            get
+            {
+                if (HasErrorBar == false)
+                {
+                    _horizontalErrorBar = AddErrorBar();
+                }
+
+                return _horizontalErrorBar;
+            }
+        }
+
+        /// <summary>
+        /// Returns whether this series has an error bar associated with it
+        /// </summary>
+        public bool HasErrorBar
+        {
+            get
+            {
+                return _horizontalErrorBar != null;
+            }
+        }
+
+        /// <summary>
+        /// Deletes the associated error bar if it exists
+        /// </summary>
+        public void DeleteErrorBar()
+        {
+            if(HasErrorBar)
+            {
+                ExcelChartErrorBar errBar = _horizontalErrorBar;
+                errBar.TopNode.ParentNode.RemoveChild(errBar.TopNode);
+                _horizontalErrorBar = null;
+            }
+        }
     }
 }

EPPlus/Drawing/Chart/ExcelChart.cs

@@ -26,8 +26,9 @@
  * 
  * Author							Change						Date
  *******************************************************************************
- * Jan Källman		Added		2009-10-01
- * Jan Källman		License changed GPL-->LGPL 2011-12-16
+ * Jan Källman		Added		                                2009-10-01
+ * Jan Källman		License changed GPL-->LGPL                  2011-12-16
+ * Kris Wragg       Added enums for error bars                  2019-08-25
  *******************************************************************************/
 using System;
 using System.Collections.Generic;
@@ -346,6 +347,59 @@ public enum eSizeRepresents
         /// </summary>
         Width
     }
+
+    public enum eErrorBarType
+    {
+        /// <summary>
+        /// Specifies that error bars shall be shown in the positive and negative directions.
+        /// </summary>
+        Both,
+        /// <summary>
+        /// Specifies that error bars shall be shown in the negative direction only.
+        /// </summary>
+        Minus,
+        /// <summary>
+        /// Specifies that error bars shall be shown in the positive direction only.
+        /// </summary>
+        Plus
+    }
+
+    public enum eErrorBarDirection
+    {
+        /// <summary>
+        /// Specifies that error bars shall be shown in the x direction.
+        /// </summary>
+        X,
+        /// <summary>
+        /// Specifies that error bars shall be shown in the y direction.
+        /// </summary>
+        Y
+    }
+
+    public enum eErrorBarValueType
+    {
+        /// <summary>
+        /// Specifies that the length of the error bars shall be determined by the Plus and Minus elements.
+        /// </summary>
+        CustomErrorBars,
+        /// <summary>
+        /// Specifies that the length of the error bars shall be the fixed value determined by Error Bar Value.
+        /// </summary>
+        FixedValue,
+        /// <summary>
+        /// Specifies that the length of the error bars shall be Error Bar Value percent of the data.
+        /// </summary>
+        Percentage,
+        /// <summary>
+        /// Specifies that the length of the error bars shall be Error Bar Value standard deviations of the data.
+        /// </summary>
+        StandardDeviation,
+        /// <summary>
+        /// Specifies that the length of the error bars shall be Error Bar Value standard errors of the data.
+        /// </summary>
+        StandardError
+    }
+
     #endregion
     /// <summary>
    /// Base class for Chart object.