let pathLayer = CAShapeLayer()
pathLayer.strokeColor = UIColor.blue.cgColor
pathLayer.lineWidth = 3.0
pathLayer.fillColor = UIColor.clear.cgColor
self.layer.addSublayer(self.pathLayer)

let path = PathCreator.createPath()

let dashes: [CGFloat] = [5.0, 2.0]
path.setLineDash(dashes, count: dashes.count, phase: 0.0)
path.lineCapStyle = .round
path.stroke()
pathLayer.path = path.cgPath
pathLayer.lineDashPattern = [5.0, 2.0]
pathLayer.lineDashPhase = 0

PathCreator {
    func createPath(resultPoints: [CGPoint]) -> UIBezierPath {
        let path = UIBezierPath()
        for i in 0..<(resultPoints.count-1) {
            if resultPoints[i] is CircleCenterPoint {
                continue
            }
            if resultPoints[i] is ArcEndPoint {
                path.move(to: resultPoints[i].cg())
                path.addLine(to: resultPoints[i+1].cg())
            }
            if let arcStartPoint = resultPoints[i] as? ArcStartPoint,
               let circleCenterPoint = resultPoints[i+1] as? CircleCenterPoint,
               let arcEndPoint = resultPoints[i+2] as? ArcEndPoint {
                path.addArc(withCenter: circleCenterPoint.cg(),
                radius: circleCenterPoint.radius,
                startAngle: arcStartPoint.arcStartAngle,
                endAngle: arcEndPoint.arcEndAngle,
                clockwise: circleCenterPoint.clockwise)
            } else {
                path.move(to: resultPoints[i].cg())
                path.addLine(to: resultPoints[i+1].cg())
            }
        }
        return path
    }
}