Canvas and Slopes, Experiment Seven

[elfs]

And here we go, thanks much to zanfur!

Experiment Seven.

For my next trick, I have to figure out where the blue line intersects the outer circle closest to where the orange line does, and draw just that segment. It's Just Algebra, with a little bit of algorithm.

Comments

[http://www.flutterby.net/User:DanLyke (from livejournal.com)]

Oh, additional note: You are aware that JavaScript canvasas have clipping regions, right? Just create a clipping region of the outer circle before you draw the blue line...