public class CubeInScalingTransformation implements ViewPager.PageTransformer {
    @Override
    public void transformPage(View page, float position) {
        page.setCameraDistance(20000);


        if (position < -1){     // [-Infinity,-1)
            // This page is way off-screen to the left.
            page.setAlpha(0);

        }
        else if (position <= 0){    // [-1,0]
            page.setAlpha(1);
            page.setPivotX(page.getWidth());
            page.setRotationY(90*Math.abs(position));

        }
        else if (position <= 1){    // (0,1]
            page.setAlpha(1);
            page.setPivotX(0);
            page.setRotationY(-90*Math.abs(position));

        }
        else{    // (1,+Infinity]
            // This page is way off-screen to the right.
            page.setAlpha(0);

        }



        if (Math.abs(position) <= 0.5){
            page.setScaleY(Math.max(.4f,1-Math.abs(position)));
        }
        else if (Math.abs(position) <= 1){
            page.setScaleY(Math.max(.4f,Math.abs(position)));

        }


    }
}