For 2D inverse kinematics. There are two available solvers:
- FABRIK - see http://www.andreasaristidou.com/publications/CUEDF-INFENG,%20TR-632.pdf
- CCD - see http://www.darwin3d.com/gamedev/articles/col1198.pdf
Note that this is the beginnings of an inverse kinematics library. At the moment it is simply a set of experiments and does not contain much that is practically useful.
- Multiple chains branches.
- Sort out the global/local transforms. It ain't pretty right now.
- 3D.
- Joint limits.
- DOF.
- Optimisations
- Integration with existing bone systems - DragonBones, Away3D etc.