Anybody know anything about efficiently doing this? Namely, creating a Speedometer, so there is a needle that moves on top of a static background image of a dial. Right now, every time the needle moves, I have to do a full clear and redraw of the background (it's slightly transparent, but it fills in completely if I don't clear). I know that there is this clear(x,y,width,height) method, but that's not terribly useful unless you want to clear a rectangle. Any wisdom to share?