PowerEase Class
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PowerEase Class

 

Represents an easing function that creates an animation that accelerates and/or decelerates using the formula f(t) = tp where p is equal to the Power property.

Namespace:   System.Windows.Media.Animation
Assembly:  PresentationCore (in PresentationCore.dll)

System::Object
  System.Windows.Threading::DispatcherObject
    System.Windows::DependencyObject
      System.Windows::Freezable
        System.Windows.Media.Animation::EasingFunctionBase
          System.Windows.Media.Animation::PowerEase

public ref class PowerEase : EasingFunctionBase

NameDescription
System_CAPS_pubmethodPowerEase()

Initializes a new instance of the PowerEase class.

NameDescription
System_CAPS_pubpropertyCanFreeze

Gets a value that indicates whether the object can be made unmodifiable. (Inherited from Freezable.)

System_CAPS_pubpropertyDependencyObjectType

Gets the DependencyObjectType that wraps the CLR type of this instance. (Inherited from DependencyObject.)

System_CAPS_pubpropertyDispatcher

Gets the Dispatcher this DispatcherObject is associated with. (Inherited from DispatcherObject.)

System_CAPS_pubpropertyEasingMode

Gets or sets a value that specifies how the animation interpolates. (Inherited from EasingFunctionBase.)

System_CAPS_pubpropertyIsFrozen

Gets a value that indicates whether the object is currently modifiable. (Inherited from Freezable.)

System_CAPS_pubpropertyIsSealed

Gets a value that indicates whether this instance is currently sealed (read-only).(Inherited from DependencyObject.)

System_CAPS_pubpropertyPower

Gets or sets the exponential power of the animation interpolation. For example, a value of 7 will create an animation interpolation curve that follows the formula f(t) = t7.

NameDescription
System_CAPS_pubmethodCheckAccess()

Determines whether the calling thread has access to this DispatcherObject.(Inherited from DispatcherObject.)

System_CAPS_pubmethodClearValue(DependencyProperty^)

Clears the local value of a property. The property to be cleared is specified by a DependencyProperty identifier. (Inherited from DependencyObject.)

System_CAPS_pubmethodClearValue(DependencyPropertyKey^)

Clears the local value of a read-only property. The property to be cleared is specified by a DependencyPropertyKey. (Inherited from DependencyObject.)

System_CAPS_pubmethodClone()

Creates a modifiable clone of the Freezable, making deep copies of the object's values. When copying the object's dependency properties, this method copies expressions (which might no longer resolve) but not animations or their current values. (Inherited from Freezable.)

System_CAPS_protmethodCloneCore(Freezable^)

Makes the instance a clone (deep copy) of the specified Freezable using base (non-animated) property values. (Inherited from Freezable.)

System_CAPS_pubmethodCloneCurrentValue()

Creates a modifiable clone (deep copy) of the Freezable using its current values.(Inherited from Freezable.)

System_CAPS_protmethodCloneCurrentValueCore(Freezable^)

Makes the instance a modifiable clone (deep copy) of the specified Freezable using current property values.(Inherited from Freezable.)

System_CAPS_pubmethodCoerceValue(DependencyProperty^)

Coerces the value of the specified dependency property. This is accomplished by invoking any CoerceValueCallback function specified in property metadata for the dependency property as it exists on the calling DependencyObject.(Inherited from DependencyObject.)

System_CAPS_protmethodCreateInstance()

Initializes a new instance of the Freezable class. (Inherited from Freezable.)

System_CAPS_protmethodCreateInstanceCore()

Creates a new instance of the Freezable derived class. When creating a derived class, you must override this method.(Overrides Freezable::CreateInstanceCore().)

System_CAPS_pubmethodEase(Double)

Transforms normalized time to control the pace of an animation.(Inherited from EasingFunctionBase.)

System_CAPS_protmethodEaseInCore(Double)

Provides the logic portion of the easing function that you can override to produce the EaseIn mode of the custom easing function.(Overrides EasingFunctionBase::EaseInCore(Double).)

System_CAPS_pubmethodEquals(Object^)

Determines whether a provided DependencyObject is equivalent to the current DependencyObject.(Inherited from DependencyObject.)

System_CAPS_protmethodFinalize()

Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection.(Inherited from Object.)

System_CAPS_pubmethodFreeze()

Makes the current object unmodifiable and sets its IsFrozen property to true. (Inherited from Freezable.)

System_CAPS_protmethodFreezeCore(Boolean)

Makes the Freezable object unmodifiable or tests whether it can be made unmodifiable.(Inherited from Freezable.)

System_CAPS_pubmethodGetAsFrozen()

Creates a frozen copy of the Freezable, using base (non-animated) property values. Because the copy is frozen, any frozen sub-objects are copied by reference. (Inherited from Freezable.)

System_CAPS_protmethodGetAsFrozenCore(Freezable^)

Makes the instance a frozen clone of the specified Freezable using base (non-animated) property values.(Inherited from Freezable.)

System_CAPS_pubmethodGetCurrentValueAsFrozen()

Creates a frozen copy of the Freezable using current property values. Because the copy is frozen, any frozen sub-objects are copied by reference.(Inherited from Freezable.)

System_CAPS_protmethodGetCurrentValueAsFrozenCore(Freezable^)

Makes the current instance a frozen clone of the specified Freezable. If the object has animated dependency properties, their current animated values are copied.(Inherited from Freezable.)

System_CAPS_pubmethodGetHashCode()

Gets a hash code for this DependencyObject.(Inherited from DependencyObject.)

System_CAPS_pubmethodGetLocalValueEnumerator()

Creates a specialized enumerator for determining which dependency properties have locally set values on this DependencyObject. (Inherited from DependencyObject.)

System_CAPS_pubmethodGetType()

Gets the Type of the current instance.(Inherited from Object.)

System_CAPS_pubmethodGetValue(DependencyProperty^)

Returns the current effective value of a dependency property on this instance of a DependencyObject. (Inherited from DependencyObject.)

System_CAPS_pubmethodInvalidateProperty(DependencyProperty^)

Re-evaluates the effective value for the specified dependency property(Inherited from DependencyObject.)

System_CAPS_protmethodMemberwiseClone()

Creates a shallow copy of the current Object.(Inherited from Object.)

System_CAPS_protmethodOnChanged()

Called when the current Freezable object is modified. (Inherited from Freezable.)

System_CAPS_protmethodOnFreezablePropertyChanged(DependencyObject^, DependencyObject^)

Ensures that appropriate context pointers are established for a DependencyObjectType data member that has just been set.(Inherited from Freezable.)

System_CAPS_protmethodOnFreezablePropertyChanged(DependencyObject^, DependencyObject^, DependencyProperty^)

This member supports the Windows Presentation Foundation (WPF) infrastructure and is not intended to be used directly from your code.(Inherited from Freezable.)

System_CAPS_protmethodOnPropertyChanged(DependencyPropertyChangedEventArgs)

Overrides the DependencyObject implementation of OnPropertyChanged to also invoke any Changed handlers in response to a changing dependency property of type Freezable.(Inherited from Freezable.)

System_CAPS_pubmethodReadLocalValue(DependencyProperty^)

Returns the local value of a dependency property, if it exists. (Inherited from DependencyObject.)

System_CAPS_protmethodReadPreamble()

Ensures that the Freezable is being accessed from a valid thread. Inheritors of Freezable must call this method at the beginning of any API that reads data members that are not dependency properties.(Inherited from Freezable.)

System_CAPS_pubmethodSetCurrentValue(DependencyProperty^, Object^)

Sets the value of a dependency property without changing its value source. (Inherited from DependencyObject.)

System_CAPS_pubmethodSetValue(DependencyProperty^, Object^)

Sets the local value of a dependency property, specified by its dependency property identifier. (Inherited from DependencyObject.)

System_CAPS_pubmethodSetValue(DependencyPropertyKey^, Object^)

Sets the local value of a read-only dependency property, specified by the DependencyPropertyKey identifier of the dependency property. (Inherited from DependencyObject.)

System_CAPS_protmethodShouldSerializeProperty(DependencyProperty^)

Returns a value that indicates whether serialization processes should serialize the value for the provided dependency property.(Inherited from DependencyObject.)

System_CAPS_pubmethodToString()

Returns a string that represents the current object.(Inherited from Object.)

System_CAPS_pubmethodVerifyAccess()

Enforces that the calling thread has access to this DispatcherObject.(Inherited from DispatcherObject.)

System_CAPS_protmethodWritePostscript()

Raises the Changed event for the Freezable and invokes its OnChanged method. Classes that derive from Freezable should call this method at the end of any API that modifies class members that are not stored as dependency properties.(Inherited from Freezable.)

System_CAPS_protmethodWritePreamble()

Verifies that the Freezable is not frozen and that it is being accessed from a valid threading context. Freezable inheritors should call this method at the beginning of any API that writes to data members that are not dependency properties. (Inherited from Freezable.)

NameDescription
System_CAPS_pubfieldSystem_CAPS_staticPowerProperty

Identifies the Power dependency property.

NameDescription
System_CAPS_pubeventChanged

Occurs when the Freezable or an object it contains is modified. (Inherited from Freezable.)

You can control whether the animation accelerates, decelerates, or both by specifying the EasingMode. The following graph demonstrates the different values of EasingMode, where f(t) represents the animation progress and t represents time.

CubicEase EasingMode graphs.

By using the PowerEase function, you can specify how quickly acceleration/deceleration takes place by specifying the Power property:

f(t) = tp where p is equal to the Power property.

Because of this, the PowerEase function can be substituted for QuadraticEase (f(t) = t2), CubicEase (f(t) = t3), QuarticEase (f(t) = t4), and QuinticEase (f(t) = t5). For example, if you wanted to use a PowerEase function to create the same behavior as a QuadraticEase function (f(t) = t2), you would specify a Power property value of 2.

There are several other easing functions besides PowerEase which you can explore using the following Silverlight sample.

Run this sample

In addition to using the easing functions included in the run-time, you can create your own custom easing functions by inheriting from EasingFunctionBase.

The following example applies a PowerEase easing function with a Power property value of 20 to a DoubleAnimation to create a decelerating animation. Because the Power value is so high, the deceleration is sudden compared to if you used a lower value.

<Rectangle Name="myRectangle" Width="200" Height="30" Fill="Blue">
    <Rectangle.Triggers>
        <EventTrigger RoutedEvent="Rectangle.MouseDown">
            <BeginStoryboard>
                <Storyboard>
                    <DoubleAnimation From="30" To="200" Duration="00:00:3" 
                     Storyboard.TargetName="myRectangle" 
                     Storyboard.TargetProperty="Height">
                        <DoubleAnimation.EasingFunction>
                            <PowerEase Power="20" EasingMode="EaseOut"/>
                        </DoubleAnimation.EasingFunction>
                    </DoubleAnimation>

                </Storyboard>
            </BeginStoryboard>
        </EventTrigger>
    </Rectangle.Triggers>

</Rectangle>

.NET Framework
Available since 4.0
Silverlight
Available since 3.0
Windows Phone Silverlight
Available since 7.0

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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