Creating mit app inventor app that scrolls screen background

Love my mit app inventor so now I need to learn how to create a background that scrolls, i can animate the sprites but i need to move the background for effect, whats the best way to do that? and ... how do i use or incorporate a really big picture for a map and have only part of it shown on the screen fog of war dungeons and dragons style and have an icon in the middle that will interact with other sprites on the bigger picture map, get it?


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check my Maze app:

Maze.aia (312.9 KB)

in flappy bird tutorial, moving the pipes(sprites).
in my aia, move the canvas.