The goal of this project is to create a UIView that can generate smooth lines from touch input in a reasonably fast manner without moving to a more complex framework like OpenGL.
Update: Completely re-written smooth line algorithm to use native CGContext quadratic curves. The result is much faster and smoother drawing. There's no more need for switching between agorithms.
Many thanks to Ginamin for his elegant solution.
The Smooth Line View code is licensed under the MIT License: http://opensource.org/licenses/MIT