[cairo] Drawing Bezier Spline Tutorial

[Bill Spitzak]

arc_to adds to the current path just like curve_to, so there should be 
no reason not to use it.

Talguy wrote:
> Does anyone know of a tutorial that will teach me how to properly draw 
> B-Spline half circles and where to setup the control points.  I'm a 
> little confused with these things.  I don't want to use an arc since i 
> would lik to be able to fill my shapes.
>  
> Talguy
> 
> 
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