Bounce.java

package it.sephiroth.android.library.easing;

public class Bounce implements Easing {

    @Override
    public double easeOut(double t, double b, double c, double d) {
        if ((t /= d) < (1.0 / 2.75)) {
            return c * (7.5625 * t * t) + b;
        } else if (t < (2.0 / 2.75)) {
            return c * (7.5625 * (t -= (1.5 / 2.75)) * t + .75) + b;
        } else if (t < (2.5 / 2.75)) {
            return c * (7.5625 * (t -= (2.25 / 2.75)) * t + .9375) + b;
        } else {
            return c * (7.5625 * (t -= (2.625 / 2.75)) * t + .984375) + b;
        }
    }

    @Override
    public double easeIn(double t, double b, double c, double d) {
        return c - easeOut(d - t, 0, c, d) + b;
    }

    @Override
    public double easeInOut(double t, double b, double c, double d) {
        if (t < d / 2.0)
            return easeIn(t * 2.0, 0, c, d) * .5 + b;
        else
            return easeOut(t * 2.0 - d, 0, c, d) * .5 + c * .5 + b;
    }
}