Back

Package	fl.transitions.easing
Class	public class Back
Inheritance	Back Object

Language Version:

ActionScript 3.0

Product Version:

Flash CS3

Runtime Versions:

Flash Player 9.0, AIR 1.0

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

Related API Elements

fl.transitions.TransitionManager

Public Properties

	Property		Defined By
		constructor : Object A reference to the class object or constructor function for a given object instance.	Object

Public Methods

	Method		Defined 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
		hasOwnProperty(name:String):Boolean Indicates whether an object has a specified property defined.	Object
		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
		propertyIsEnumerable(name:String):Boolean Indicates whether the specified property exists and is enumerable.	Object
		setPropertyIsEnumerable(name:String, isEnum:Boolean = true):void Sets the availability of a dynamic property for loop operations.	Object
		toLocaleString():String Returns the string representation of this object, formatted according to locale-specific conventions.	Object
		toString():String Returns the string representation of the specified object.	Object
		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

Product Version:

Flash CS3

Runtime Versions:

Flash Player 9.0, AIR 1.0

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 ( How to use this 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

Product Version:

Flash CS3

Runtime Versions:

Flash Player 9.0, AIR 1.0

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 ( How to use this 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

Product Version:

Flash CS3

Runtime Versions:

Flash Player 9.0, AIR 1.0

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 ( How to use this 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;

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easeIn

easeInOut

easeOut