diff --git a/Sources/CALayer+AnimateBehavior.swift b/Sources/CALayer+AnimateBehavior.swift
index b905754..2680dd1 100644
--- a/Sources/CALayer+AnimateBehavior.swift
+++ b/Sources/CALayer+AnimateBehavior.swift
@@ -959,7 +959,7 @@ extension CALayer: DriveAnimateBehaviors {
         return push
     }
     
-    private func snapBehavior<T: Vectorial>(damping: CGFloat, from: T, to: T, render: (T) -> Void) -> UIDynamicBehavior {
+    private func snapBehavior<T: Vectorial where T.VectorType == CGPoint>(damping: CGFloat, from: T, to: T, render: (T) -> Void) -> UIDynamicBehavior {
         let item = DynamicItem(from: from, to: to, render: render)
         let snap = item.snapBehavior(item.toP, damping: damping)
         item.behavior = snap
@@ -967,7 +967,7 @@ extension CALayer: DriveAnimateBehaviors {
         return snap
     }
     
-    private func snapBehavior<T: Vectorial2>(damping: CGFloat, from: T, to: T, render: (T) -> Void) -> UIDynamicBehavior {
+    private func snapBehavior<T: Vectorial where T.VectorType == CGRect>(damping: CGFloat, from: T, to: T, render: (T) -> Void) -> UIDynamicBehavior {
         let item = DynamicItem2(from: from, to: to, render: render)
         let point = CGPointMake(0.0, item.referenceChangeLength)
         let snap = item.snapBehavior(point, damping: damping)
@@ -976,14 +976,14 @@ extension CALayer: DriveAnimateBehaviors {
         return snap
     }
     
-    private func attachmentBehavior<T: Vectorial>(damping: CGFloat, frequency: CGFloat, from: T, to: T, render: (T) -> Void) -> UIDynamicBehavior {
+    private func attachmentBehavior<T: Vectorial where T.VectorType == CGPoint>(damping: CGFloat, frequency: CGFloat, from: T, to: T, render: (T) -> Void) -> UIDynamicBehavior {
         let item = DynamicItem(from: from, to: to, render: render)
         let attachment = item.attachmentBehavior(item.toP, length: 0.0, damping: damping, frequency: frequency)
         item.behavior = attachment
         return attachment
     }
     
-    private func attachmentBehavior<T: Vectorial2>(damping: CGFloat, frequency: CGFloat, from: T, to: T, render: (T) -> Void) -> UIDynamicBehavior {
+    private func attachmentBehavior<T: Vectorial where T.VectorType == CGRect>(damping: CGFloat, frequency: CGFloat, from: T, to: T, render: (T) -> Void) -> UIDynamicBehavior {
         let item = DynamicItem2(from: from, to: to, render: render)
         let point = CGPointMake(0.0, item.referenceChangeLength)
         let attachment = item.attachmentBehavior(point, length: 0.0, damping: damping, frequency: frequency)
diff --git a/Sources/DynamicItem.swift b/Sources/DynamicItem.swift
index ef5c817..ce11ae1 100644
--- a/Sources/DynamicItem.swift
+++ b/Sources/DynamicItem.swift
@@ -8,7 +8,7 @@
 
 import UIKit
 
-final class DynamicItem<T: Vectorial>: NSObject, UIDynamicItem {
+final class DynamicItem<T: Vectorial where T.VectorType == CGPoint>: NSObject, UIDynamicItem {
     var from: T
     var to: T
     var render: (T) -> Void
diff --git a/Sources/DynamicItem2.swift b/Sources/DynamicItem2.swift
index 0f227eb..2e1e8c8 100644
--- a/Sources/DynamicItem2.swift
+++ b/Sources/DynamicItem2.swift
@@ -9,7 +9,7 @@
 import UIKit
 
 //for 4 latitude
-final class DynamicItem2<T: Vectorial2>: NSObject, UIDynamicItem {
+final class DynamicItem2<T: Vectorial where T.VectorType == CGRect>: NSObject, UIDynamicItem {
     
     var from: T
     var to: T
diff --git a/Sources/UIView+AnimateBehavior.swift b/Sources/UIView+AnimateBehavior.swift
index 37ecc9e..a2b93c9 100644
--- a/Sources/UIView+AnimateBehavior.swift
+++ b/Sources/UIView+AnimateBehavior.swift
@@ -1005,7 +1005,7 @@ extension UIView: DriveAnimateBehaviors {
         return push
     }
     
-    private func snapBehavior<T: Vectorial>(damping: CGFloat, from: T, to: T, render: (T) -> Void) -> UIDynamicBehavior {
+    private func snapBehavior<T: Vectorial where T.VectorType == CGPoint>(damping: CGFloat, from: T, to: T, render: (T) -> Void) -> UIDynamicBehavior {
         let item = DynamicItem(from: from, to: to, render: render)
         let snap = item.snapBehavior(item.toP, damping: damping)
         item.behavior = snap
@@ -1013,7 +1013,7 @@ extension UIView: DriveAnimateBehaviors {
         return snap
     }
     
-    private func snapBehavior<T: Vectorial2>(damping: CGFloat, from: T, to: T, render: (T) -> Void) -> UIDynamicBehavior {
+    private func snapBehavior<T: Vectorial where T.VectorType == CGRect>(damping: CGFloat, from: T, to: T, render: (T) -> Void) -> UIDynamicBehavior {
         let item = DynamicItem2(from: from, to: to, render: render)
         let point = CGPointMake(0.0, item.referenceChangeLength)
         let snap = item.snapBehavior(point, damping: damping)
@@ -1022,14 +1022,14 @@ extension UIView: DriveAnimateBehaviors {
         return snap
     }
     
-    private func attachmentBehavior<T: Vectorial>(damping: CGFloat, frequency: CGFloat, from: T, to: T, render: (T) -> Void) -> UIDynamicBehavior {
+    private func attachmentBehavior<T: Vectorial where T.VectorType == CGPoint>(damping: CGFloat, frequency: CGFloat, from: T, to: T, render: (T) -> Void) -> UIDynamicBehavior {
         let item = DynamicItem(from: from, to: to, render: render)
         let attachment = item.attachmentBehavior(item.toP, length: 0.0, damping: damping, frequency: frequency)
         item.behavior = attachment
         return attachment
     }
     
-    private func attachmentBehavior<T: Vectorial2>(damping: CGFloat, frequency: CGFloat, from: T, to: T, render: (T) -> Void) -> UIDynamicBehavior {
+    private func attachmentBehavior<T: Vectorial where T.VectorType == CGRect>(damping: CGFloat, frequency: CGFloat, from: T, to: T, render: (T) -> Void) -> UIDynamicBehavior {
         let item = DynamicItem2(from: from, to: to, render: render)
         let point = CGPointMake(0.0, item.referenceChangeLength)
         let attachment = item.attachmentBehavior(point, length: 0.0, damping: damping, frequency: frequency)
diff --git a/Sources/Value+Physical.swift b/Sources/Value+Physical.swift
index 6b37be0..a6530fa 100644
--- a/Sources/Value+Physical.swift
+++ b/Sources/Value+Physical.swift
@@ -344,7 +344,7 @@ extension CGPoint: Physical, Vectorial, Interpolatable {
     }
 }
 
-extension CGRect: Physical, Vectorial2, Interpolatable {
+extension CGRect: Physical, Vectorial, Interpolatable {
     
     public func fallTo(to: CGRect,magnitude: Double = 1.0, render: (CGRect) -> Void, completion: (() -> Void)? = nil) {
         let item = DynamicItemGravity(from: self, to: to, render: render)
@@ -419,7 +419,7 @@ extension CGRect: Physical, Vectorial2, Interpolatable {
     }
 }
 
-extension UIColor: Physical, Vectorial2, Interpolatable {
+extension UIColor: Physical, Vectorial, Interpolatable {
     
     public func fallTo(to: UIColor,magnitude: Double = 1.0, render: (UIColor) -> Void, completion: (() -> Void)? = nil) {
         let item = DynamicItemGravity(from: self, to: to, render: render)
diff --git a/Sources/Vectorial.swift b/Sources/Vectorial.swift
index fecaa6c..0df78e1 100644
--- a/Sources/Vectorial.swift
+++ b/Sources/Vectorial.swift
@@ -9,11 +9,7 @@
 import UIKit
 
 protocol Vectorial {
-    func convert(p: CGPoint) -> Self
-    func reverse() -> CGPoint
-}
-
-protocol Vectorial2 {
-    func convert(r: CGRect) -> Self
-    func reverse() -> CGRect
+    associatedtype VectorType
+    func convert(p: VectorType) -> Self
+    func reverse() -> VectorType
 }
\ No newline at end of file
diff --git a/StellarDemo/StellarDemo.xcodeproj/project.xcworkspace/xcuserdata/August.xcuserdatad/UserInterfaceState.xcuserstate b/StellarDemo/StellarDemo.xcodeproj/project.xcworkspace/xcuserdata/August.xcuserdatad/UserInterfaceState.xcuserstate
index 7398600..e98d6f8 100644
Binary files a/StellarDemo/StellarDemo.xcodeproj/project.xcworkspace/xcuserdata/August.xcuserdatad/UserInterfaceState.xcuserstate and b/StellarDemo/StellarDemo.xcodeproj/project.xcworkspace/xcuserdata/August.xcuserdatad/UserInterfaceState.xcuserstate differ
diff --git a/StellarDemo/StellarDemo/MyPlayground.playground/Sources/Sources/CALayer+Stellar.swift b/StellarDemo/StellarDemo/MyPlayground.playground/Sources/Sources/CALayer+Stellar.swift
index 13ff0c2..6c95ee1 100644
--- a/StellarDemo/StellarDemo/MyPlayground.playground/Sources/Sources/CALayer+Stellar.swift
+++ b/StellarDemo/StellarDemo/MyPlayground.playground/Sources/Sources/CALayer+Stellar.swift
@@ -10,6 +10,8 @@ import UIKit
 
 extension CALayer: BasicConfigurable1, SnapConfigurable1, AttachmentConfigurable1, GravityConfigurable1, StepControllable {
     
+    typealias AnimationItem = CALayer
+    
     //MARK: animation methods
     public func moveTo(point: CGPoint) -> CALayer {
         let type = AnimationType(type: .Basic, subType: .MoveTo(point))