WARNING: Certain combinations may cause it to run very slow and might result in your browser crashing. I tried limiting this as much as possible, but any more and it would start to reduce the overall functionality.

I also decided not to add restraint rectangles for the point handles, because that would also reduce some of interesting outcomes which can be made.

Enjoy!

Here's a few examples of what I made with it:
:thumb335059620::thumb336427584::thumb343411324: