content: package com.amatellanes.android.examples.transformers;
  
  import android.support.v4.view.ViewPager;
  import android.view.View;
  
  public class ZoomOutPageTransformer implements ViewPager.PageTransformer {
  	private static float MIN_SCALE = 0.85f;
  	private static float MIN_ALPHA = 0.5f;
  
  	public void transformPage(View view, float position) {
  		int pageWidth = view.getWidth();
  		int pageHeight = view.getHeight();
  
  		if (position < -1) { // [-Infinity,-1)
  			// This page is way off-screen to the left.
  			view.setAlpha(0);
  
  		} else if (position <= 1) { // [-1,1]
  			// Modify the default slide transition to shrink the page as well
  			float scaleFactor = Math.max(MIN_SCALE, 1 - Math.abs(position));
  			float vertMargin = pageHeight * (1 - scaleFactor) / 2;
  			float horzMargin = pageWidth * (1 - scaleFactor) / 2;
  			if (position < 0) {
  				view.setTranslationX(horzMargin - vertMargin / 2);
  			} else {
  				view.setTranslationX(-horzMargin + vertMargin / 2);
  			}
  
  			// Scale the page down (between MIN_SCALE and 1)
  			view.setScaleX(scaleFactor);
  			view.setScaleY(scaleFactor);
  
  			// Fade the page relative to its size.
  			view.setAlpha(MIN_ALPHA + (scaleFactor - MIN_SCALE)
  					/ (1 - MIN_SCALE) * (1 - MIN_ALPHA));
  
  		} else { // (1,+Infinity]
  			// This page is way off-screen to the right.
  			view.setAlpha(0);
  		}
  	}
  }