Drawing an ellipse

[OldMoses]

Now how you do this with Draw commands and without Trig, that's something! But it might be done with Pythagorus and some rotations.

I've been trying to suss out how one might go about this using my standard vector functions (which require a good bit of setup overhead). The more I've struggled with it, the more I'm convinced the de La Hire and rotation matrix method is the way to go. After almost 100 lines of code that doesn't work, as opposed to a dozen or so that work fine using a couple SIN & COS functions, I'm about ready to throw in the towel on a non-trig solution. Even the vector approach would need 'some' trig to keep it manageable.