Point.swift

struct Point: Hashable {
    
    let cgPoint: CGPoint

    var nsValue: NSValue  { return cgPoint as NSValue }

    var x: CGFloat { return cgPoint.x }
    var y: CGFloat { return cgPoint.y }

    init(x: CGFloat, y: CGFloat) {
        self.cgPoint = CGPoint(x: x, y: y)
    }
    init(cgPoint: CGPoint = .zero) {
        self.cgPoint = cgPoint
    }
    static func == (lhs: Point, rhs: Point) -> Bool {
        return lhs.cgPoint == rhs.cgPoint
    }
    public var hashValue: Int {
        return nsValue.hashValue
    }
}