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Date: Fri, 01 Jun 2012 07:39:53 -0400
From: Gus Fantanas <fantanas AT innocent DOT com>
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To: geda-user AT delorie DOT com
Subject: Re: [geda-user] Odd Behavior Around Vias
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On 06/01/2012 03:32 AM, Stephen Ecob wrote:
> I've trimmed Gus's "buggy.pcb" down to the attached "bug.pcb" that
> seems to be the smallest file that still shows the bug.
>
> The observed problem is related to a somewhat poorly formed polygon:
>
> 	Polygon("clearpoly,fullpoly")
> 	(
> 		[713.00mil 1557.00mil] [662.00mil 1557.00mil] [662.00mil 1589.00mil]
> [654.00mil 1589.00mil] [654.00mil 1665.00mil]
> 		[665.00mil 1676.00mil] [674.00mil 1676.00mil] [674.00mil 1708.00mil]
> [674.00mil 1706.00mil] [524.00mil 1706.00mil]
> 		[524.00mil 1705.00mil] [566.00mil 1663.00mil] [566.00mil 1557.00mil]
> 	)
>
> The polygon is somewhat poorly formed because the vertex [713.00mil
> 1557.00mil] forms a zero width protrusion from the vertex [662.00mil
> 1557.00mil]
>
> If the via is removed the polygon is fine, but the combination of the
> zero length extension with the via in close proximity triggers a bug
> in the polygon handling code.
>
> I'd guess the main aspect of the bug is a geometry error in the
> polygon handling code.
> A secondary aspect of the bug is that PCB allows a poorly formed
> polygon to be created from the UI (I assume it was created from the UI
> !)
>
Yes, it was created from  the UI.

Gus