[cairo] A diagram for criticism/comments

[Travis Griggs]

Pretty graphic.  I see others have taken issue with the "nouns"  
section. One way to respin this is as paths. I see a strong operator  
and surface presence in this slide, but Paths are kind of assumed.

I think Paths are an important First Class citizen of the Cairo  
lingo. The fact that they can be disjoint. The differences between  
"closed" and "ending at the starting point." The fact that winding  
direction matters. That you can use them for clipping as well as  
stroking and filling.

When I gave some Cairo presentations/tutorials, I broke it down into  
3 main sections: Surfaces, Paths, and Operators (verbs). Each which  
builds on the next.

--
Travis Griggs
Objologist
"It had better be a pretty good meeting, to be better than no meeting
at all" - Boyd K Packer