Cubic.java

package it.sephiroth.android.library.easing;

public class Cubic implements Easing {

    @Override
    public double easeOut(double time, double start, double end, double duration) {
        return end * ((time = time / duration - 1.0) * time * time + 1.0) + start;
    }

    @Override
    public double easeIn(double time, double start, double end, double duration) {
        return end * (time /= duration) * time * time + start;
    }

    @Override
    public double easeInOut(double time, double start, double end, double duration) {
        if ((time /= duration / 2.0) < 1.0) return end / 2.0 * time * time * time + start;
        return end / 2.0 * ((time -= 2.0) * time * time + 2.0) + start;
    }
}