The Back class defines three easing functions to implement
motion with Flex effect classes.
For more information, see http://www.robertpenner.com/profmx.
public static function easeIn(t:Number, b:Number, c:Number, d:Number, s:Number = 0, ... rest):Number
The easeIn()
method starts
the motion by backtracking,
then reversing direction and moving toward the target.
Parameters
 t:Number — Specifies time.


 b:Number — Specifies the initial position of a component.


 c:Number — Specifies the total change in position of the component.


 d:Number — Specifies the duration of the effect, in milliseconds.


 s:Number (default = 0 ) — Specifies the amount of overshoot, where the higher the value,
the greater the overshoot.


 ... rest 
Returns
 Number — Number corresponding to the position of the component.

public static function easeInOut(t:Number, b:Number, c:Number, d:Number, s:Number = 0, ... rest):Number
The easeInOut()
method combines the motion
of the easeIn()
and easeOut()
methods
to start the motion by backtracking, then reversing direction and
moving toward target, overshooting target slightly, reversing direction again, and
then moving back toward the target.
Parameters
 t:Number — Specifies time.


 b:Number — Specifies the initial position of a component.


 c:Number — Specifies the total change in position of the component.


 d:Number — Specifies the duration of the effect, in milliseconds.


 s:Number (default = 0 ) — Specifies the amount of overshoot, where the higher the value,
the greater the overshoot.


 ... rest 
Returns
 Number — Number corresponding to the position of the component.

public static function easeOut(t:Number, b:Number, c:Number, d:Number, s:Number = 0, ... rest):Number
The easeOut()
method starts the motion by
moving towards the target, overshooting it slightly,
and then reversing direction back toward the target.
Parameters
 t:Number — Specifies time.


 b:Number — Specifies the initial position of a component.


 c:Number — Specifies the total change in position of the component.


 d:Number — Specifies the duration of the effect, in milliseconds.


 s:Number (default = 0 ) — Specifies the amount of overshoot, where the higher the value,
the greater the overshoot.


 ... rest 
Returns
 Number — Number corresponding to the position of the component.

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