Sine.java

package it.sephiroth.android.library.easing;

public class Sine implements Easing {

    @Override
    public double easeOut(double t, double b, double c, double d) {
        return c * Math.sin(t / d * (Math.PI / 2)) + b;
    }

    @Override
    public double easeIn(double t, double b, double c, double d) {
        return -c * Math.cos(t / d * (Math.PI / 2)) + c + b;
    }

    @Override
    public double easeInOut(double t, double b, double c, double d) {
        return -c / 2 * (Math.cos(Math.PI * t / d) - 1) + b;
    }

}