Circ.java

package it.sephiroth.android.library.easing;

public class Circ implements Easing {

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

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

    @Override
    public double easeInOut(double time, double start, double end, double duration) {
        if ((time /= duration / 2) < 1)
            return -end / 2.0 * (Math.sqrt(1.0 - time * time) - 1.0) + start;
        return end / 2.0 * (Math.sqrt(1.0 - (time -= 2.0) * time) + 1.0) + start;
    }

}