[trocchietto]

A bunch of pdf/ebook readers offer the possibility to browse books leafing trough the page! OnTap you drag the finger and see the transparency of the letters from the other side, dragging the finger down while maintaining the touch state the superior corner of the page come toward the center in the measure of the angle you are going down, the letter are seen on transparence from the other side of the page.

Although I do some coding I cannot dare even to think about how this is achievable? Do you have some tips to make me understand how is possible? there is an open source project that show how is possible to achieve such a complex effect? I do not want to write a viewer sw, there are already too many but definetely I want to become a better android developer.