getLabelValues
abstract fun getLabelValues(context: CartesianDrawingContext, visibleXRange: ERROR CLASS: Symbol not found for ClosedFloatingPointRange<kotlin/Double>, fullXRange: ERROR CLASS: Symbol not found for ClosedFloatingPointRange<kotlin/Double>, maxLabelWidth: Float): List<Double>
Returns, as a list, the x values for which labels are to be displayed, restricted to visibleXRange and with two extra values on either side (if applicable).