Also inspired by AntiGrain, I made a CLX application to interactively test various path transformations. This tool is not yet released.
This screenshot show various stroke transformations, round transformation and clipping transformation.
This screenshot show experimentation with adaptive segmentation for a 6th degree Bezier curve.
This screenshot show new stroking stuff, handling arcs, with annotated paths (including normals in red to each interpolations ends):
It is important to note that thanks to Common Lisp and SLIME, I never have to leave the current application to update the code (which is compiled natively.) I can easily tweak the program at run time.