Adobe® Flex® 4 Language Reference
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spark.effects.easing 
Power 
Packagespark.effects.easing
Classpublic class Power
InheritancePower Inheritance EaseInOutBase Inheritance Object

Language Version: ActionScript 3.0
Product Version: Flex 4
Runtime Versions: Flash Player 10, AIR 1.5

The Power class defines the easing functionality using a polynomial expression. Easing consists of two phases: the acceleration, or ease in phase, followed by the deceleration, or ease out phase. The rate of acceleration and deceleration is based on the exponent property. The higher the value of the exponent property, the greater the acceleration and deceleration. Use the easeInFraction property to specify the percentage of an animation accelerating.

MXML SyntaxexpandedHide MXML Syntax

The <s:Power> tag inherits all of the tag attributes of its of its superclass, and adds the following tag attributes:

  <s:Power
    id="ID"
    exponent="2"
   />
  

View the examples



Public Properties
 PropertyDefined By
 Inheritedconstructor : Object
A reference to the class object or constructor function for a given object instance.
Object
 InheritedeaseInFraction : Number
The percentage of an animation that should be spent accelerating.
EaseInOutBase
  exponent : Number
The exponent used in the easing calculation.
Power
 Inheritedprototype : Object
[static] A reference to the prototype object of a class or function object.
Object
Public Methods
 MethodDefined By
  
Power(easeInFraction:Number = 0.5, exponent:Number = 2)
Constructor.
Power
 Inherited
ease(fraction:Number):Number
Takes the fraction representing the elapsed duration of an animation (a value between 0.0 to 1.0) and returns a new elapsed value.
EaseInOutBase
 Inherited
Indicates whether an object has a specified property defined.
Object
 Inherited
Indicates whether an instance of the Object class is in the prototype chain of the object specified as the parameter.
Object
 Inherited
Indicates whether the specified property exists and is enumerable.
Object
 Inherited
Sets the availability of a dynamic property for loop operations.
Object
 Inherited
Returns the string representation of this object, formatted according to locale-specific conventions.
Object
 Inherited
Returns the string representation of the specified object.
Object
 Inherited
Returns the primitive value of the specified object.
Object
Protected Methods
 MethodDefined By
 Inherited
easeIn(fraction:Number):Number
Returns a value that represents the eased fraction during the ease in phase of the animation.
EaseInOutBase
 Inherited
Returns a value that represents the eased fraction during the ease out phase of the animation.
EaseInOutBase
Property Detail

exponent

property
exponent:Number

Language Version: ActionScript 3.0
Product Version: Flex 4
Runtime Versions: Flash Player 10, AIR 1.5

The exponent used in the easing calculation. The higher the value of the exponent property, the greater the acceleration and deceleration. For example, to get quadratic behavior, set exponent to 2. To get cubic behavior, set exponent to 3.

The default value is 2.



Implementation
    public function get exponent():Number
    public function set exponent(value:Number):void
Constructor Detail

Power

()Constructor
public function Power(easeInFraction:Number = 0.5, exponent:Number = 2)

Language Version: ActionScript 3.0
Product Version: Flex 4
Runtime Versions: Flash Player 10, AIR 1.5

Constructor.

Parameters
easeInFraction:Number (default = 0.5) — The fraction of the overall duration in the acceleration phase, between 0.0 and 1.0.
 
exponent:Number (default = 2) — The exponent used in the easing calculation.
SinePowerEffectExample.mxml
<?xml version="1.0"?>
<!-- Simple example to demonstrate the s:Sine and s:Power classes. -->
<s:Application
    xmlns:fx="http://ns.adobe.com/mxml/2009"
    xmlns:mx="library://ns.adobe.com/flex/mx"
    xmlns:s="library://ns.adobe.com/flex/spark">

    <fx:Declarations>
        <s:Sine id="sineEasing"
            easeInFraction="0.3"/>
        <s:Power id="powerEasing"
            exponent="4"/>
        <s:Move id="moveRight" 
            target="{myImage}"
            xBy="500"
            duration="2000"
            easer="{powerEasing}"/>
        <s:Move id="moveLeft" 
            target="{myImage}"
            xBy="-500"
            duration="2000"
            easer="{sineEasing}"/>
    </fx:Declarations>


    <s:Panel id="examplePanel"
        title="Sine and Power Effect Example"
        width="75%" height="75%">

        <!-- Directions -->
        <s:VGroup id="detailsBox" width="50%" top="5" left="5">
            <s:Label width="99%" color="blue"
                text="Click the buttons to watch the effect."/>
        </s:VGroup>

        <mx:Image id="myImage" top="20"
            source="@Embed(source='assets/logo.jpg')"/>
            
        <s:Button label="Move Right"
             bottom="10" left="5" 
            click="moveRight.end();moveRight.play();"/>
            
        <s:Button label="Move Left" 
            bottom="10" left="100" 
            click="moveLeft.end();moveLeft.play();"/>
    </s:Panel>
</s:Application>