[cairo] Cairo 3d Cube

[cecashon at aol.com]

OK, the cairo transparent 3d cube with text is working. Looks really good.

https://github.com/cecashon/OrderedSetVelociRaptor/blob/master/Misc/cairo_drawings/euler1.c

There are squares in the cube that are rotated with a cairo transform and without to make sure the planes match up. They do. 

Eric
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