libspiro: libspiro 20071029 (Spiro library)  
libspiro:  
libspiro: Spiro is a library to simplify drawing of beautiful curves. Using 
libspiro: bézier splines an artist can easily draw curves with the same slope 
libspiro: on either side of an on-curve point. Spiros, on the other hand, are 
libspiro: based on clothoid splines which make it easy to maintain constant 
libspiro: curvature as well as constant slope. Such curves will simply look 
libspiro: nicer. This library will take an array of spiro control points and 
libspiro: convert them into a series of bézier splines which can then be used 
libspiro: in the myriad of ways the world has come to use béziers.  
libspiro: http://libspiro.sourceforge.net/ 

