Eric Wilhelm wrote:
From the info that I've been able to find, an ellipse can only be approximated with a quadric bezier curve. Is that correct?
From everything that I have read too.
Can anyone please give me some hints as to whether the inkscape source has anything that would be generically usable for converting ellipses to bezier? I've been digging through the source starting with extension/internal/ps-out.cpp and it appears to be leading me to ps.cpp, but I think I missed the conversion.
I think inkscape converts svg paths that have elliptical arcs on load too. You might start looking here. http://www.inkscape.org/doc/doxygen/html/svg-path_8cpp.php
Don Lancaster has the most useful stuff about cubic splines I have found so far. He might have something to help you. http://www.tinaja.com/cubic01.asp
I'll keep combing source and sending you pointers until I see someone send you the right answer. :)
Aaron Spike