Top and bottom are instance variables. Try to make them local, move them to onDraw method. Now you change them every time onDraw called and they don't reset to top=100,bottom=500 after onDraw finished.
The title of your question is pretty misleading... does not sound like there is really any endless loop there.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.