# androidx.constraintlayout.core.motion.utils # androidx.constraintlayout.core.motion.utils *** ** * ** *** Kotlin\|[Java](https://developer.android.com/reference/androidx/constraintlayout/core/motion/utils/package-summary "View this page in Java") ## Interfaces |-----------------------------------------------------------------------------------------------------------------------------------------------------|--------------------------------------------------------------------------------------| | [DifferentialInterpolator](https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/motion/utils/DifferentialInterpolator) | | | [StopEngine](https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/motion/utils/StopEngine) | | | [TypedValues](https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/motion/utils/TypedValues) | Provides an interface to values used in KeyFrames and in Starting and Ending Widgets | | [TypedValues.AttributesType](https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/motion/utils/TypedValues.AttributesType) | | | [TypedValues.Custom](https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/motion/utils/TypedValues.Custom) | | | [TypedValues.CycleType](https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/motion/utils/TypedValues.CycleType) | | | [TypedValues.MotionScene](https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/motion/utils/TypedValues.MotionScene) | | | [TypedValues.MotionType](https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/motion/utils/TypedValues.MotionType) | | | [TypedValues.OnSwipe](https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/motion/utils/TypedValues.OnSwipe) | | | [TypedValues.PositionType](https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/motion/utils/TypedValues.PositionType) | | | [TypedValues.TransitionType](https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/motion/utils/TypedValues.TransitionType) | | | [TypedValues.TriggerType](https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/motion/utils/TypedValues.TriggerType) | | | [Utils.DebugHandle](https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/motion/utils/Utils.DebugHandle) | | ## Classes |-----------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | [ArcCurveFit](https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/motion/utils/ArcCurveFit) | This provides provides a curve fit system that stitches the x,y path together with quarter ellipses | | [CurveFit](https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/motion/utils/CurveFit) | Base class for curve fitting / interpolation Curve fits must be capable of being differentiable and extend beyond the points (extrapolate) | | [Easing](https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/motion/utils/Easing) | Provide the engine for cubic spline easing | | [FloatRect](https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/motion/utils/FloatRect) | | | [HyperSpline](https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/motion/utils/HyperSpline) | Provides spline interpolation code. | | [HyperSpline.Cubic](https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/motion/utils/HyperSpline.Cubic) | | | [KeyCache](https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/motion/utils/KeyCache) | Used by KeyTimeCycles (and any future time dependent behaviour) to cache its current parameters to maintain consistency across requestLayout type rebuilds. | | [KeyCycleOscillator](https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/motion/utils/KeyCycleOscillator) | Provide the engine for executing cycles. | | [KeyCycleOscillator.PathRotateSet](https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/motion/utils/KeyCycleOscillator.PathRotateSet) | | | [KeyFrameArray](https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/motion/utils/KeyFrameArray) | | | [KeyFrameArray.CustomArray](https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/motion/utils/KeyFrameArray.CustomArray) | | | [KeyFrameArray.CustomVar](https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/motion/utils/KeyFrameArray.CustomVar) | | | [LinearCurveFit](https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/motion/utils/LinearCurveFit) | This performs a simple linear interpolation in multiple dimensions | | [MonotonicCurveFit](https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/motion/utils/MonotonicCurveFit) | This performs a spline interpolation in multiple dimensions | | [Oscillator](https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/motion/utils/Oscillator) | This generates variable frequency oscillation curves | | [Rect](https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/motion/utils/Rect) | | | [Schlick](https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/motion/utils/Schlick) | Schlick's bias and gain functions curve for use in an easing function including quantize functions | | [SplineSet](https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/motion/utils/SplineSet) | This engine allows manipulation of attributes by Curves | | [SplineSet.CustomSet](https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/motion/utils/SplineSet.CustomSet) | | | [SplineSet.CustomSpline](https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/motion/utils/SplineSet.CustomSpline) | | | [SpringStopEngine](https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/motion/utils/SpringStopEngine) | This contains the class to provide the logic for an animation to come to a stop using a spring model. | | [StepCurve](https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/motion/utils/StepCurve) | This class translates a series of floating point values into a continuous curve for use in an easing function including quantize functions it is used with the "spline(0,0.3,0.3,0.5,...0.9,1)" it should start at 0 and end at one 1 | | [StopLogicEngine](https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/motion/utils/StopLogicEngine) | This contains the class to provide the logic for an animation to come to a stop. | | [StopLogicEngine.Decelerate](https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/motion/utils/StopLogicEngine.Decelerate) | | | [TimeCycleSplineSet](https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/motion/utils/TimeCycleSplineSet) | This engine allows manipulation of attributes by wave shapes oscillating in time | | [TimeCycleSplineSet.CustomSet](https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/motion/utils/TimeCycleSplineSet.CustomSet) | | | [TimeCycleSplineSet.CustomVarSet](https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/motion/utils/TimeCycleSplineSet.CustomVarSet) | | | [TimeCycleSplineSet.Sort](https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/motion/utils/TimeCycleSplineSet.Sort) | | | [TypedBundle](https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/motion/utils/TypedBundle) | | | [Utils](https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/motion/utils/Utils) | | | [VelocityMatrix](https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/motion/utils/VelocityMatrix) | This is used to calculate the related velocity matrix for a post layout matrix | | [ViewState](https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/motion/utils/ViewState) | |