Animation.swift

//
//  Direction.swift
//  ForeverMaze
//
//  Created by Zane Claes on 1/18/16.
//  Copyright © 2016 inZania LLC. All rights reserved.
//

import Foundation

enum Direction: Int {
  case N,E,S,W
  
  var description:String {
    switch self {
    case N: return "N"
    case E: return "E"
    case S: return "S"
    case W: return "W"
    }
  }
  
  var amount:(Int, Int) {
    switch self {
    case N: return (0,1)
    case E: return (1,0)
    case S: return (0,-1)
    case W: return (-1,0)
    }
  }
  
  static var directions:Array<Direction> {
    return [N,E,S,W]
  }
  
  init?(degrees: Int) {
    let degreesPerDirection = Double(360 / Direction.directions.count)
    var rotatedDegrees = Double(degrees)
    rotatedDegrees = rotatedDegrees > 360 ? (rotatedDegrees - 360) : rotatedDegrees
    rotatedDegrees = rotatedDegrees < 0 ? (rotatedDegrees + 360) : rotatedDegrees
    let raw = Int(floor(rotatedDegrees / degreesPerDirection))
    self.init(rawValue: raw)
  }
}