[cairo] how do you draw an outline of a circle/ellipse

[Lawrence D'Oliveiro]

On Wed, 11 Nov 2015 09:54:00 -0800, Bill Spitzak wrote:

> ... the current behaviour makes it impossible to draw an
> ellipse using the arc commands where the line is the same thickness
> on all sides ...

Not at all
<https://github.com/ldo/qahirah_examples/blob/master/ellipses>,
<http://default-cube.deviantart.com/art/Ellipses-567083675>.