I’ve released a ‘rough cut’ of the AS 3 Parametric Curve Library. Although the Flex demos (MXML files in the demos folder) exercise most of the methods, the library has yet to be extensively unit tested. There is also no external documentation. Some elements of the library are to be used for skinning in the Rigging classes (currently under development). After the basic Rigging classes are complete, I expect the library to have been pretty extensively tested.
In the mean time, you can find out more about the parametric curve library here. Enjoy!
The Algorithmist 