Aourhgad

Well I feel I am trying to do something very foolish. I want to change my game engine from a room by room deal, to a scrolling tile engine. I want to walk from one map into the other witht he effect of a seamless transition.

I've done some research and I have decided to load up 9 maps in a 3 by 3 grid. Unfortunately i can't figure out how i'm going to handle rendinger parts of lets say if i am inbetween the top and middle row and moving left. As of now it loads the data from the txt files into ana rray and then renders it on a surface. I am thinking of rendering all 9 maps onto 1 surface at a time.

Anyhow how would i achieve rendering the maps while there can be parts of 4 different maps visible at once?