A couple of areas that I'm trying to improve in are BitmapData and Trigonometry. Trig is really useful in Flash for working with angles and BitmapData can give some pretty cool effects.

I started this example by making a MovieClip rotate around a center point. I know I could have used TweenMax to rotate around a center point, but the idea here is to do the math, remember? Here are some posts I referenced. Kirupa, ActionScript.org.

After I got the MovieClip rotating, I decided to use it to create some interesting effects with BitmapData. I simply referenced the ActionScript 3.0 Language Reference for this.

[Move your mouse around the stage. The closer you get to the center cross hair, the smaller the ball's radius gets. Click and drag your mouse to draw lines from the center.]