diff --git a/Source/Charts/Animation/Animator.swift b/Source/Charts/Animation/Animator.swift
index cec0987572..f5d8459095 100644
--- a/Source/Charts/Animation/Animator.swift
+++ b/Source/Charts/Animation/Animator.swift
@@ -55,7 +55,7 @@ open class Animator: NSObject
     
     fileprivate var _easingX: ChartEasingFunctionBlock?
     fileprivate var _easingY: ChartEasingFunctionBlock?
-    
+
     public override init()
     {
         super.init()
@@ -68,11 +68,10 @@ open class Animator: NSObject
     
     @objc open func stop()
     {
-        guard let _displayLink = _displayLink else {
-            return
-        }
-        _displayLink.remove(from: RunLoop.main, forMode: RunLoopMode.commonModes)
-        self._displayLink = nil
+        guard _displayLink != nil else { return }
+
+        _displayLink?.remove(from: .main, forMode: .commonModes)
+        _displayLink = nil
 
         _enabledX = false
         _enabledY = false
@@ -91,7 +90,7 @@ open class Animator: NSObject
         stopBlock?()
     }
     
-    fileprivate func updateAnimationPhases(_ currentTime: TimeInterval)
+    private func updateAnimationPhases(_ currentTime: TimeInterval)
     {
         if _enabledX
         {
@@ -103,7 +102,7 @@ open class Animator: NSObject
                 elapsed = duration
             }
            
-            phaseX = _easingX?(elapsed, duration) ?? Double(elapsed / duration)
+            phaseX = _easingX?(elapsed, duration) ?? elapsed / duration
         }
         
         if _enabledY
@@ -115,15 +114,8 @@ open class Animator: NSObject
             {
                 elapsed = duration
             }
-            
-            if let _easingY = _easingY
-            {
-                phaseY = _easingY(elapsed, duration)
-            }
-            else
-            {
-                phaseY = Double(elapsed / duration)
-            }
+
+            phaseY = _easingY?(elapsed, duration) ?? elapsed / duration
         }
     }
     
@@ -134,7 +126,6 @@ open class Animator: NSObject
         updateAnimationPhases(currentTime)
 
         delegate?.animatorUpdated(self)
-
         updateBlock?()
         
         if currentTime >= _endTime
@@ -202,20 +193,11 @@ open class Animator: NSObject
     /// - parameter xAxisDuration: duration for animating the x axis
     /// - parameter yAxisDuration: duration for animating the y axis
     /// - parameter easingOption: the easing function for the animation
-    @objc open func animate(xAxisDuration: TimeInterval, yAxisDuration: TimeInterval, easingOption: ChartEasingOption)
+    @objc open func animate(xAxisDuration: TimeInterval, yAxisDuration: TimeInterval, easingOption: ChartEasingOption = .easeInOutSine)
     {
         animate(xAxisDuration: xAxisDuration, yAxisDuration: yAxisDuration, easing: easingFunctionFromOption(easingOption))
     }
-    
-    /// Animates the drawing / rendering of the chart on both x- and y-axis with the specified animation time.
-    /// If `animate(...)` is called, no further calling of `invalidate()` is necessary to refresh the chart.
-    /// - parameter xAxisDuration: duration for animating the x axis
-    /// - parameter yAxisDuration: duration for animating the y axis
-    @objc open func animate(xAxisDuration: TimeInterval, yAxisDuration: TimeInterval)
-    {
-        animate(xAxisDuration: xAxisDuration, yAxisDuration: yAxisDuration, easingOption: .easeInOutSine)
-    }
-    
+
     /// Animates the drawing / rendering of the chart the x-axis with the specified animation time.
     /// If `animate(...)` is called, no further calling of `invalidate()` is necessary to refresh the chart.
     /// - parameter xAxisDuration: duration for animating the x axis
@@ -233,13 +215,11 @@ open class Animator: NSObject
         // Take care of the first frame if rendering is already scheduled...
         updateAnimationPhases(_startTimeX)
         
-        if _enabledX || _enabledY
+        if _enabledX || _enabledY,
+            _displayLink == nil
         {
-            if _displayLink == nil
-            {
-                _displayLink = NSUIDisplayLink(target: self, selector: #selector(animationLoop))
-                _displayLink?.add(to: RunLoop.main, forMode: RunLoopMode.commonModes)
-            }
+            _displayLink = NSUIDisplayLink(target: self, selector: #selector(animationLoop))
+            _displayLink?.add(to: .main, forMode: .commonModes)
         }
     }
     
@@ -247,19 +227,11 @@ open class Animator: NSObject
     /// If `animate(...)` is called, no further calling of `invalidate()` is necessary to refresh the chart.
     /// - parameter xAxisDuration: duration for animating the x axis
     /// - parameter easingOption: the easing function for the animation
-    @objc open func animate(xAxisDuration: TimeInterval, easingOption: ChartEasingOption)
+    @objc open func animate(xAxisDuration: TimeInterval, easingOption: ChartEasingOption = .easeInOutSine)
     {
         animate(xAxisDuration: xAxisDuration, easing: easingFunctionFromOption(easingOption))
     }
-    
-    /// Animates the drawing / rendering of the chart the x-axis with the specified animation time.
-    /// If `animate(...)` is called, no further calling of `invalidate()` is necessary to refresh the chart.
-    /// - parameter xAxisDuration: duration for animating the x axis
-    @objc open func animate(xAxisDuration: TimeInterval)
-    {
-        animate(xAxisDuration: xAxisDuration, easingOption: .easeInOutSine)
-    }
-    
+
     /// Animates the drawing / rendering of the chart the y-axis with the specified animation time.
     /// If `animate(...)` is called, no further calling of `invalidate()` is necessary to refresh the chart.
     /// - parameter yAxisDuration: duration for animating the y axis
@@ -277,13 +249,11 @@ open class Animator: NSObject
         // Take care of the first frame if rendering is already scheduled...
         updateAnimationPhases(_startTimeY)
         
-        if _enabledX || _enabledY
+        if _enabledX || _enabledY,
+            _displayLink == nil
         {
-            if _displayLink == nil
-            {
-                _displayLink = NSUIDisplayLink(target: self, selector: #selector(animationLoop))
-                _displayLink?.add(to: RunLoop.main, forMode: RunLoopMode.commonModes)
-            }
+            _displayLink = NSUIDisplayLink(target: self, selector: #selector(animationLoop))
+            _displayLink?.add(to: .main, forMode: .commonModes)
         }
     }
     
@@ -291,16 +261,8 @@ open class Animator: NSObject
     /// If `animate(...)` is called, no further calling of `invalidate()` is necessary to refresh the chart.
     /// - parameter yAxisDuration: duration for animating the y axis
     /// - parameter easingOption: the easing function for the animation
-    @objc open func animate(yAxisDuration: TimeInterval, easingOption: ChartEasingOption)
+    @objc open func animate(yAxisDuration: TimeInterval, easingOption: ChartEasingOption = .easeInOutSine)
     {
         animate(yAxisDuration: yAxisDuration, easing: easingFunctionFromOption(easingOption))
     }
-    
-    /// Animates the drawing / rendering of the chart the y-axis with the specified animation time.
-    /// If `animate(...)` is called, no further calling of `invalidate()` is necessary to refresh the chart.
-    /// - parameter yAxisDuration: duration for animating the y axis
-    @objc open func animate(yAxisDuration: TimeInterval)
-    {
-        animate(yAxisDuration: yAxisDuration, easingOption: .easeInOutSine)
-    }
 }