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2D/3D visualization library for Jav

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/*
 *   casmi
 *   http://casmi.github.com/
 *   Copyright (C) 2011, Xcoo, Inc.
 *
 *  casmi is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Lesser General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public License
 *  along with this program.  If not, see .
 */

package casmi.tween.equations;

import casmi.tween.TweenEquation;


public class CircularInOut implements TweenEquation {

    @Override
    public final double compute(double t, double b, double c, double d) {
        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;
    }

}