Various fields are available for diagrams including:
§ LL.ChartObject.ArcIndex: returns the index of the current pie segment. The largest pie segment has index 1, the second largest has index 2 and so on.
This means, for example, that you can assign a greater explosion offset to the largest pie segment: Cond(LL.ChartObject.ArcIndex=1,30,10)
§ LL.ChartObject.ArcPerc: returns the percentage share of the current pie segment. This field is especially useful for labeling the pie segment.
§ LL.ChartObject.ArcTotal: returns the absolute value of the total data volume with pie charts.
§ LL.ChartObject.ArcTypeIsOthers: returns True, if the current pie segment is the "other" segment.
This means, for example, that you can assign a greater explosion offset to the "other" pie segment: Cond(LL.ChartObject.ArcTypeIsOthers,30,10)
§ LL.ChartObject.ArcValue: returns the absolute value of the current pie segment. This field is especially useful for labeling the pie segment.
§ LL.ChartObject.AxisCoordinate: returns the coordinate value and can be used for labeling the axes.
You will find more information about this in the chapter Overview of Functions.