To move anything in the OidZone, I need to give each object an x position, a y position, and a list of moves the object needs to perform for the next 10 frames of animation. Any object can move in any of 16 directions, which simplified, is a -1, 0, or +1 pixel move in the x or y directions per frame. Every game frame I look at this table of moves and if the object needs to move this frame, I adjust it's x and y position in the playfield accordingly.

The only tricky part is when the object leaves the left, right,top, or bottom of the screen. Once the object is off screen I need to "wrap" the object's x,y coorinates to the opposite side of the screen. If it goes off the top of the screen, it comes back on screen from the bottom of the screen. If it goes off the left, it comes back on the right. That's what I'm working on tonight.