Packagefl.transitions.easing
Classpublic class Back
InheritanceBack Inheritance Object

Language Version: ActionScript 3.0
Runtime Versions: AIR 1.0 Flash Player 9.0

The Back class defines three easing functions to implement motion with ActionScript animations.

See also

fl.transitions.TransitionManager

Public Properties
 PropertyDefined By
 Inheritedconstructor : Object
A reference to the class object or constructor function for a given object instance.
Object
 Inheritedprototype : Object
[static] A reference to the prototype object of a class or function object.
Object
Public Methods
 MethodDefined By
  
easeIn(t:Number, b:Number, c:Number, d:Number, s:Number = 0):Number
[static] The easeIn() method starts the motion by backtracking and then reversing direction and moving toward the target.
Back
  
easeInOut(t:Number, b:Number, c:Number, d:Number, s:Number = 0):Number
[static] The easeInOut() method combines the motion of the easeIn() and easeOut() methods to start the motion by backtracking, then reversing direction and moving toward the target, overshooting the target slightly, reversing direction again, and then moving back toward the target.
Back
  
easeOut(t:Number, b:Number, c:Number, d:Number, s:Number = 0):Number
[static] The easeOut() method starts the motion by moving towards the target, overshooting it slightly, and then reversing direction back toward the target.
Back
 Inherited
hasOwnProperty(name:String):Boolean
Indicates whether an object has a specified property defined.
Object
 Inherited
isPrototypeOf(theClass:Object):Boolean
Indicates whether an instance of the Object class is in the prototype chain of the object specified as the parameter.
Object
 Inherited
propertyIsEnumerable(name:String):Boolean
Indicates whether the specified property exists and is enumerable.
Object
 Inherited
setPropertyIsEnumerable(name:String, isEnum:Boolean = true):void
Sets the availability of a dynamic property for loop operations.
Object
 Inherited
toString():String
Returns the string representation of the specified object.
Object
 Inherited
valueOf():Object
Returns the primitive value of the specified object.
Object
Method Detail
easeIn()method
public static function easeIn(t:Number, b:Number, c:Number, d:Number, s:Number = 0):Number

Language Version: ActionScript 3.0
Runtime Versions: AIR 1.0 Flash Player 9.0

The easeIn() method starts the motion by backtracking and then reversing direction and moving toward the target.

Parameters

t:Number — Specifies the current time, between 0 and duration inclusive.
 
b:Number — Specifies the initial value of the animation property.
 
c:Number — Specifies the total change in the animation property.
 
d:Number — Specifies the duration of the motion.
 
s:Number (default = 0) — Specifies the amount of overshoot, where the higher the value, the greater the overshoot.

Returns
Number — The value of the interpolated property at the specified time.

Example

This example animates a rectangle using the Back.easeIn easing function: 
import fl.transitions.*;
import fl.transitions.easing.*;

stage.frameRate = 31;

var box:Sprite = new Sprite();
box.graphics.beginFill(Math.random() * 0xFFFFFF);
box.graphics.drawRect(0, 0, 100, 350);
box.graphics.endFill();
box.x = 50;
box.y = 10;
addChild(box);

var startValue:Number = box.x;
var finishValue:Number = 400;
var duration:Number = 3;
var myTween:Tween = new Tween(box, "x", Back.easeIn, startValue, finishValue, duration, true);
myTween.looping = true;
easeInOut()method 
public static function easeInOut(t:Number, b:Number, c:Number, d:Number, s:Number = 0):Number

Language Version: ActionScript 3.0
Runtime Versions: AIR 1.0 Flash Player 9.0

The easeInOut() method combines the motion of the easeIn() and easeOut() methods to start the motion by backtracking, then reversing direction and moving toward the target, overshooting the target slightly, reversing direction again, and then moving back toward the target.

Parameters

t:Number — Specifies the current time, between 0 and duration inclusive.
 
b:Number — Specifies the initial value of the animation property.
 
c:Number — Specifies the total change in the animation property.
 
d:Number — Specifies the duration of the motion.
 
s:Number (default = 0) — Specifies the amount of overshoot, where the higher the value, the greater the overshoot.

Returns
Number — The value of the interpolated property at the specified time.

Example

This example animates a rectangle using the Back.easeInOut easing function: 
import fl.transitions.*;
import fl.transitions.easing.*;

stage.frameRate = 31;

var box:Sprite = new Sprite();
box.graphics.beginFill(Math.random() * 0xFFFFFF);
box.graphics.drawRect(0, 0, 100, 350);
box.graphics.endFill();
box.x = 50;
box.y = 10;
addChild(box);

var startValue:Number = box.x;
var finishValue:Number = 400;
var duration:Number = 3;
var myTween:Tween = new Tween(box, "x", Back.easeInOut, startValue, finishValue, duration, true);
myTween.looping = true;
easeOut()method 
public static function easeOut(t:Number, b:Number, c:Number, d:Number, s:Number = 0):Number

Language Version: ActionScript 3.0
Runtime Versions: AIR 1.0 Flash Player 9.0

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 the current time, between 0 and duration inclusive.
 
b:Number — Specifies the initial value of the animation property.
 
c:Number — Specifies the total change in the animation property.
 
d:Number — Specifies the duration of the motion.
 
s:Number (default = 0) — Specifies the amount of overshoot, where the higher the value, the greater the overshoot.

Returns
Number — The value of the interpolated property at the specified time.

Example

This example animates a rectangle using the Back.easeOut easing function: 
import fl.transitions.*;
import fl.transitions.easing.*;

stage.frameRate = 31;

var box:Sprite = new Sprite();
box.graphics.beginFill(Math.random() * 0xFFFFFF);
box.graphics.drawRect(0, 0, 100, 350);
box.graphics.endFill();
box.x = 50;
box.y = 10;
addChild(box);

var startValue:Number = box.x;
var finishValue:Number = 400;
var duration:Number = 3;
var myTween:Tween = new Tween(box, "x", Back.easeOut, startValue, finishValue, duration, true);
myTween.looping = true;



© 2004-2008 Adobe Systems Incorporated. All rights reserved.
Wed Nov 19 2008, 09:06 AM -08:00
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