ElasticEaseInOut.java

/*
 *
 *  * The MIT License (MIT)
 *  *
 *  * Copyright (c) 2014 daimajia
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 *  * Permission is hereby granted, free of charge, to any person obtaining a copy
 *  * of this software and associated documentation files (the "Software"), to deal
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 *  * copies of the Software, and to permit persons to whom the Software is
 *  * furnished to do so, subject to the following conditions:
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 *  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 *  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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package com.marshalchen.common.uimodule.easing.elastic;

import com.marshalchen.common.uimodule.easing.BaseEasingMethod;

public class ElasticEaseInOut extends BaseEasingMethod{
    public ElasticEaseInOut(float duration) {
        super(duration);
    }

    @Override
    public Float calculate(float t, float b, float c, float d) {
        if (t==0) return b;  if ((t/=d/2)==2) return b+c;
        float p=d*(.3f*1.5f);
        float a=c;
        float s=p/4;
        if (t < 1) return -.5f*(a*(float)Math.pow(2,10*(t-=1)) * (float)Math.sin( (t*d-s)*(2*(float)Math.PI)/p )) + b;
        return a*(float)Math.pow(2,-10*(t-=1)) * (float)Math.sin( (t*d-s)*(2*(float)Math.PI)/p )*.5f + c + b;
    }
}