What all will be involved in your scenario? First, there are many ways to scroll. Universal, vertical, side, uni-directional (up only, down only, left only, or right only). Then, there is limited or infinite scrolling. Then, are you using a grid-world or pixel-sized cells? Do you want your image to repeat side-to-side and/or top-to-bottom? or just have an over-sized image for the window to scroll over?