Sequence of InterViews 3.1 canvas.curve_to to Idraw BSpl

I see in ivtools-1.2/src/IVGlyph/figure.c
how to convert *_BSpline31 arrays into a sequence of curve_to calls.
But I need to go the other way.
My application uses curve_to and contains an Idraw file writer which
needs to convert them to a BSpl or CBSpl.
Does anyone know the algorithm?

By the way, if anyone is interested, I've long been maintaining
a mac os x carbon and MSWindows version of InterViews 3.2a for use
with my application and the tar.gz file can be found at
http://www.neuron.yale.edu/neuron/install/install.html
It builds using an autoconf generated configure file. With X11
it also builds the original idraw using
the Unidraw and InterViews-2.6 compatibility classes, but I never
got around to porting the InterViews-2.6/x*.c files to carbon or
mswin so idraw never made it to those places.

-Michael Hines



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