/*******************************************************************************
* Port of Robert Penner's easing equations for Nebula animation package.
* Copyright (c) 2008-2009 Nicolas Richeton.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
*******************************************************************************/
/*********************************************************************************
* TERMS OF USE - EASING EQUATIONS
*
* Copyright � 2001 Robert Penner
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the author nor the names of contributors may be
* used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE REGENTS AND CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
********************************************************************************/
package org.eclipse.nebula.cwt.animation.movement;
public class ElasticOut extends AbstractMovement {
Double a = null, p = null;
public ElasticOut(double a, double p) {
super();
this.a = new Double(a);
this.p = new Double(p);
}
public ElasticOut() {
super();
}
public double getValue(double step) {
double c = max - min;
double s;
if (step == 0) {
return min;
}
step = step / duration;
if ((step) == 1d)
return min + c;
if (p == null)
p = new Double(duration * .3);
if (a == null || a.doubleValue() < Math.abs(c)) {
a = new Double(c);
s = p.doubleValue() / 4d;
}
else
s = p.doubleValue() / (2d * Math.PI)
* Math.asin(c / a.doubleValue());
return (a.doubleValue()
* Math.pow(2d, -10d * step)
* Math.sin((step * duration - s) * (2d * Math.PI)
/ p.doubleValue()) + c + min);
}
}