bezieio

I open sourced Bezie (https://github.com/jperler/bezie), a library I wrote three years ago for MIDI automation curves. It includes some good examples of how to interpolate cubic and quadratic bezier curves given drag points on the curves. I used Pomax's bezier write ups as a starting point, which really helped out a lot (thanks Pomax!). If anyone is interested, take a look in `bezie/app/utils`, specifically the `getControl` methods that allow you to derive control points.

I'm in full agreement that bezier curves are hard to learn to use well! I created an app called Bezie (http://bezie.io/) about a year ago in which you could create quadratic and cubic bezier MIDI automation. I ended up not including it in the release, but I had a smoothness feature where it'd basically update the amount of steps that it'd pass to the interpolate function (using De Casteljau's algorithm). The more steps the higher the curve resolution. I found 64 steps to be somewhat of a magic number as it always looked and sounded smooth. There's also the balance of how many times you want the interpolate function to run while dragging points. With too high a resolution it gets CPU intensive and lags and with too low it starts getting boxy and no longer represents a curve. It's been on my plate to open source the app. It includes some helpful math for deriving control points while dragging points on the curve. Anyhow, nice post and thanks for sharing!