//////////////////////////////////////////////////////////////////////////////// // // 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; } } }