   
   var players: Array<AVAudioPlayer> = []
   
-  let slits_count = 8
+  let SLIT_COUNT = 8
   var leds: Array<UIView> = []
-  var prev_deg: Double = 0.0
-  var slit_degs: Array<Double> = [] // 分割数に応じて360度を当分した角度を保持しておく配列
+  var prevDeg: Double = 0.0
+  var slitDegs: Array<Double> = [] // 分割数に応じて360度を当分した角度を保持しておく配列
   
   override func viewDidLoad() {
     super.viewDidLoad()
     
     // 画面上のLEDの準備
-    let count = Double(slits_count)
-    for i in 0..<slits_count {
-      slit_degs += [360.0/count*Double(i)]
+    let count = Double(SLIT_COUNT)
+    for i in 0..<SLIT_COUNT {
+      slitDegs += [360.0/count*Double(i)]
     }
     leds = [
       led1,

    ]
    
    // AudioPlayerの準備
    for i in 0..<slits_count {
      let sound_data = NSURL(fileURLWithPath: NSBundle.mainBundle().pathForResource("Blue Ballad - Pattern 2 - 96 - \(i)", ofType: "wav")!)
      let player = AVAudioPlayer(contentsOfURL: sound_data, error: nil)
      player.prepareToPlay()

  func updateRotation(radian: Double) {
    let current_deg = self.radiansToDegrees(radian)
    label.text = "\(floor(current_deg))"
    let passed_index = self.getSlitIndexInRange(self.prevDeg, current: current_deg)
    if 0 < passed_index.count {
      for slit_index in passed_index {
        // スクリーンのLED
