Hello. In the branch https://code.launchpad.net/~jabiertxof/inkscape/B-Spline whe develop spiro pen while drawing, as first part of the b-spline editing. You can check it and comment.

Now i have a problem, i want to convert a node CUSP to SYMM or SMOOTH. I have the SPCurve -now drawing- and is in a function whith SPPenContext but the GEOM::POINT to change is not the last of the SPCurve (Is the penultimate). Any body can help me?

Sorry for my bad english