in Source/Charts/Data/Interfaces/LineChartDataSetProtocol.swift [49:59]
func getCircleColor(atIndex: Int) -> NSUIColor?
/// Sets the one and ONLY color that should be used for this DataSet.
/// Internally, this recreates the colors array and adds the specified color.
func setCircleColor(_ color: NSUIColor)
/// Resets the circle-colors array and creates a new one
func resetCircleColors(_ index: Int)
/// If true, drawing circles is enabled
var drawCirclesEnabled: Bool { get set }