[cairo] Rotations with Quaternions

cecashon at aol.com cecashon at aol.com
Sat Jan 20 19:13:48 UTC 2018

I added a frame clock to rotation1.c for comparison with the VeloGyro widget. Made a few additional changes so they look the same. 


It looks like everything works fine with cairo's transforms. The quaternion rotations look stable across the reals. The quaternion rotations aren't additive with this setup but that isn't a problem with cairo_save() and cairo_restore(). You can still animate rotations without a problem.


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