Hello MartinRinehart,
I take the opportunity of your thread to thank you for the Edges to Rubies you link in your signature. I found out your tutorial some month ago and pages 15 and 16 made me on the track of animation. Just what I needed to jump into and now I am developing my own code I have just named a class the same of your 'Transformable' in your honour. It's quit different from your but the name makes me remember your excellent tutorial. A thousand of thanks once more.
Have a good day
Sorry for the sidetrack. Second time today!