Enum for selecting step behavior for StepSeries.
This must be specified when the StepSeries is created, and can't be changed afterwards.
The y-value changes after the x-value.
The y-value changes before the x-value.
The y-value changes at the midpoint of each pair of adjacent x-values.
Enum for selecting step behavior for StepSeries.
This must be specified when the StepSeries is created, and can't be changed afterwards.