////////////////////////////////////////////////////////////////////////////////
//
// Licensed to the Apache Software Foundation (ASF) under one or more
// contributor license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright ownership.
// The ASF licenses this file to You under the Apache License, Version 2.0
// (the "License"); you may not use this file except in compliance with
// the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
////////////////////////////////////////////////////////////////////////////////
package mx.effects.easing
{
/**
* The Circular class defines three easing functions to implement
* circular motion with Flex effect classes.
*
* For more information, see http://www.robertpenner.com/profmx.
*
* @langversion 3.0
* @playerversion Flash 9
* @playerversion AIR 1.1
* @productversion Flex 3
*/
public class Circular
{
include "../../core/Version.as";
//--------------------------------------------------------------------------
//
// Class methods
//
//--------------------------------------------------------------------------
/**
* The easeIn()
method starts motion slowly,
* and then accelerates motion as it executes.
*
* @param t Specifies time.
*
* @param b Specifies the initial position of a component.
*
* @param c Specifies the total change in position of the component.
*
* @param d Specifies the duration of the effect, in milliseconds.
*
* @return Number corresponding to the position of the component.
*
* @langversion 3.0
* @playerversion Flash 9
* @playerversion AIR 1.1
* @productversion Flex 3
*/
public static function easeIn(t:Number, b:Number,
c:Number, d:Number):Number
{
return -c * (Math.sqrt(1 - (t /= d) * t) - 1) + b;
}
/**
* The easeOut()
method starts motion fast,
* and then decelerates motion as it executes.
*
* @param t Specifies time.
*
* @param b Specifies the initial position of a component.
*
* @param c Specifies the total change in position of the component.
*
* @param d Specifies the duration of the effect, in milliseconds.
*
* @return Number corresponding to the position of the component.
*
* @langversion 3.0
* @playerversion Flash 9
* @playerversion AIR 1.1
* @productversion Flex 3
*/
public static function easeOut(t:Number, b:Number,
c:Number, d:Number):Number
{
return c * Math.sqrt(1 - (t = t/d - 1) * t) + b;
}
/**
* The easeInOut()
method combines the motion
* of the easeIn()
and easeOut()
methods
* to start the motion slowly, accelerate motion, then decelerate.
*
* @param t Specifies time.
*
* @param b Specifies the initial position of a component.
*
* @param c Specifies the total change in position of the component.
*
* @param d Specifies the duration of the effect, in milliseconds.
*
* @return Number corresponding to the position of the component.
*
* @langversion 3.0
* @playerversion Flash 9
* @playerversion AIR 1.1
* @productversion Flex 3
*/
public static function easeInOut(t:Number, b:Number,
c:Number, d:Number):Number
{
if ((t /= d / 2) < 1)
return -c / 2 * (Math.sqrt(1 - t * t) - 1) + b;
return c / 2 * (Math.sqrt(1 - (t -= 2) * t) + 1) + b;
}
}
}