[Pharo-users] Scrolling in a Morphic game

Hello, I am developing a game in Morphic -- nothing serious; just a spare time project -- and I have come to a tricky part: the viewport. So far, I have just put my Morphs in a PasteUpMorph for testing, but now I need to have a viewport to a (game) world that is larger than the screen, and be able to pan/scroll the view around the world. I really have no idea how I could or should do this in Morphic. Maybe subclass PasteUpMorph and override #drawSubmorphs? Can anyone here offer any advice with this? Regards, Aidan