spark.effects.easing

# IEaser - AS3 Flex

Package | spark.effects.easing
Interface | public interface IEaser
Implementors | Bounce, EaseInOutBase, Elastic, Linear

Language Version: | ActionScript 3.0

Product Version: | Flex 4

Runtime Versions: | Flash Player 10, AIR 1.5

The IEaser interface is implemented by classes that provide time-easing functionality for the Animation class. Implementors are responsible for the single function, `ease()`, which takes and returns a fraction according to the easing behavior desired. As a simple example, LinearEase simply returns the same input fraction, since there is no easing performed by that easer. As another example, a reversing easer could be written which returned the inverse fraction, (1 - `fraction`).

By easing the fractional values of the time elapsed in an animation, these classes are easing the resulting values of the animation, but they only have to deal with the fractional value of time instead of any specific object types.

Related API Elements

spark.effects.animation.Animation

Public Methods

| Method | Defined By
--- | --- | ---
|  | 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. | IEaser

Method Detail

### ease

()
method

`public function ease(fraction:Number):Number`

Language Version: | ActionScript 3.0

Product Version: | Flex 4

Runtime Versions: | Flash Player 10, AIR 1.5

Takes the fraction representing the elapsed duration of an animation (a value between 0.0 to 1.0) and returns a new elapsed value. This value is used to calculate animated property values. By changing the value of the elapsed fraction, you effectively change the animation of the property.

Parameters

| `fraction:Number` — The elapsed fraction of an animation, from 0.0 to 1.0.

Returns

| `Number` — The eased value for the elapsed time. Typically, this value should be constrained to lie between 0.0 and 1.0, although it is possible to return values outside of this range. Note that the results of returning such values are undefined, and depend on what kind of effects are using this eased value. For example, an object moving in a linear fashion can have positions calculated outside of its start and end point without a problem, but other value types (such as color) may not result in desired effects if they use time values that cause them to surpass their endpoint values.

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Mon Apr 10 2017, 12:28 PM -07:00