Very nice visualizations. I used to build lots of little game-type simulations like this and I remember working my way through a very similar progression as I f

Very nice visualizations. I used to build lots of little game-type simulations like this and I remember working my way through a very similar progression as I figured out how to draw circles and position things based on angles. This summary was a nice refresher for me but if I were just learning it (i.e. looking for a tutorial) I would probably want more in-depth explanation along the way.