[cairo] Cairo vs GnomeCanvas

[Manu]

Hi, 

I have been looking on google and still cannot get a
clear answer about what is cairo compare to
gnomecanvas.

1) so I am wondering what is the main differences
between Cairo and GnomeCanvas? 

2 ) or is GnomeCanvas using Cairo under the scene? ( I
read that evolution and Gnome are using more and more
Cairo...) 

3) what are the advantages of using Cairo rather than
Gnome Canvas?

4) Any working ruby example? I tried the one from
Rcairo and they all failed.

Thanks

Emmanuel

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