Angle.swift

Angle.swift

// Playground - noun: a place where people can play

import Foundation

func DegreesToRadians (value:Double) -> Double {
    return value * M_PI / 180.0
}

func RadiansToDegrees (value:Double) -> Double {
    return value * 180.0 / M_PI
}

enum Angle {
    case Radians(Double)
    case Degrees(Double)

    var scalar: Double {
        switch(self) {
            case .Radians(let v):
                return v
            case .Degrees(let v):
                return v
        }
    }

    var radians: Angle {
        switch(self) {
            case .Radians(_):
                return self
            case .Degrees(let value):
                return .Radians(DegreesToRadians(value))
        }
    }

    var degrees: Angle {
        switch(self) {
            case .Degrees(let value):
                return .Degrees(RadiansToDegrees(value))
            case .Radians(_):
                return self
        }
    }
}

extension Double {

    init(_ angle:Angle) {
        self.init(angle.scalar)
    }

}

sizeof(Double)
sizeof(Angle)

let a = Angle.Degrees(90)
a.scalar
Double(a.radians)