UIBezierPath, functional programming style

gistfile1.txt

class Path {
    private let path: UIBezierPath
    init() { self.path = UIBezierPath() }

    func move(to point: CGPoint) -> Path {
        path.move(to: point)
        return self
    }

    func addArc(withCenter center: CGPoint, radius: CGFloat, startAngle: CGFloat, endAngle: CGFloat, clockwise: Bool) -> Path {
        path.addArc(withCenter: center, radius: radius, startAngle: startAngle, endAngle: endAngle, clockwise: clockwise)
        return self
    }

    func addLine(to point: CGPoint) -> Path {
        path.addLine(to: point)
        return self
    }

    func close() -> UIBezierPath {
        path.close()
        return path
    }
}

let path = Path()
  .move(to: CGPoint(x: 5, y: 5))
  .addLine(to: CGPoint(x: 10, y:5))
  .close()