Based upon a game called Asteroids where if you went off one side of the screen you came back on the corresponding spot on the opposite side. Used to investigate the angles and how "fast" it takes to fill up the screen, how unevenly, etc. Use the sliders to set int, sqrt, and div. They are used to form the angle measure (from the horizontal) by the formula: (*int* + [the square root of *sqrt*])/*div* The pen will follow the tracks of where the asteroid goes. ***Update from version one: depending on speed, the computer can't calculate fast enough and there's overshoot. In version 2, I've put some qualifiers in to try and reduce overshoot. It's not perfect: there's still some overshoot and undershoot too, now. If you want a more perfect result, try .5 speed. It might take a while though.
