Patch tested successfully on Windows XP (32-bit), with Inkscape trunk rev. 14998.
Difficulties to test due to zeroDivision errors in some cases (reproduced with 0.48.5), and some rendering errors (only 2 points used to trace the circle instead of 3), quite rare with 0.48.5 but a lot more frequent with the trunk. Both points are not related to the patch IMHO, and should be investigated separately.
Patch tested successfully on Windows XP (32-bit), with Inkscape trunk rev. 14998.
Difficulties to test due to zeroDivision errors in some cases (reproduced with 0.48.5), and some rendering errors (only 2 points used to trace the circle instead of 3), quite rare with 0.48.5 but a lot more frequent with the trunk. Both points are not related to the patch IMHO, and should be investigated separately.