kicad-developers team mailing list archive

[Wayne Stambaugh <stambaughw@xxxxxxxxx>]

John,

If I only apply patch 1, shouldn't the arc bounding box test fail?  I
just tried this and all of the tests passed.

Wayne

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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