enum PathType {
        case yolo, vision
    }

    private let yoloPath = UIBezierPath()
    private let visionPath = UIBezierPath()
    private let yoloLayer = CAShapeLayer()
    private let visionLayer = CAShapeLayer()
    private var previousTouchPoint = CGPoint.zero
func drawPath(at point: CGPoint, pathType: PathType) {
        let path: UIBezierPath
        let shapeLayer: CAShapeLayer
        switch pathType {
        case .yolo:
            path = yoloPath
            shapeLayer = yoloLayer
        case .vision:
            path = visionPath
            shapeLayer = visionLayer
        }

        path.move(to: point)
        if self.previousTouchPoint !=  CGPoint.zero {
            path.addLine(to: self.previousTouchPoint)
        }

        self.previousTouchPoint = point
        shapeLayer.path = path.cgPath
        switch pathType {
        case .yolo:
             shapeLayer.strokeColor = UIColor.red.cgColor
        case .vision:
             shapeLayer.strokeColor = UIColor.green.cgColor
        }
    }