IGNumericRadiusAxis Class Reference
IGNumericRadiusAxis is a numeric axis used by polar and radial series. It is displayed along the radius of the series. It supports inversion, logarithmic and linear scales and extent scales.
A value that determines the how far off-center the radius axis begins.
@property (nonatomic) float innerRadiusExtentScale
This property determines the percentage of the maximum radius extent to leave blank at the center of the chart. The value should be between 0 and 1.