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Hey John,

I merged your patch.



On 1/9/2019 11:14 AM, John Beard wrote:
> Hi,
> Couple of patches for the SHAPE_ARC geometry class.
> Notably, a bug in the bounding box code is exposed: the bbox is
> currently computed to be a box that contains the start, end and
> centre. This does not work if the arc passes a "quadrant point". This
> is not an issue for 90-deg arcs, but it means, for example, the bbox
> for a 180 degree arc is zero-area, as the centre and both endpoints
> are collinear. This could be related to occasional rumours of pads
> disappearing when at high zoom (?)
> The second patch contains a computation for it and removes the
> expected failures. It would be good to get a review to check I've done
> it correctly! Specifically: have I missed an important case in the
> tests?
> Also includes a couple of handy geometry test predicates for vectors and boxes.
> Cheers,
> John
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