[cairo] Rotations with Quaternions

[cecashon at aol.com]

Hi Cairo Folks,

Would using quaternions for rotation and shear be workable internally in Cairo? It would make for a simplified function for setting up the rotation and shear of a drawing by requiring pitch, roll and yaw parameters. This is something that is visually easier for a programmer to understand even when drawing in 2d.

This is some test code using quaternions with Cairo and GTK. 

https://github.com/cecashon/OrderedSetVelociRaptor/blob/master/Misc/cairo_drawings/ellipse3.c

Eric
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