Re: gEDA-user: Polygon and short

[Dan McMahill <dan@xxxxxxxxxxxx>]

joel silvestre wrote:
> Sometimes PCB detects short in or close to polygons which doesn't really
> exists.
> The included screenshot shows one.
> The shape attached to the pad is a lost island from the polygon. The
> upper track indicated by the arrow touch the lost island under the pad.
> If they doesn't touch each other no more the short disappear.
> And if the "clearlines flag" is set on the track the short disappear.
>
> I had an other short where the lost island was completely lost, hidden
> by the clearance of surronding elements. Setting the clearlines flag
> resolves this short too.
>
> This seem's to be repeatable, at least in this design...
>
> joel


Unfortunately, this is a real bug which is known:

http://sourceforge.net/tracker/index.php?func=detail&aid=1192501&group_id=73743&atid=538811

What you're seeing is another way it can show up.  Basically everything 
connected to a polygon is considered connected even if the polygon 
copper has been cut into disjoint regions via lines.  So you can either 
get complaints about shorts when none exist (your case) or you may be 
told everything is connected when it isn't (the case in the bug report).

If anyone is looking for a good pcb algorithm and coding project, this 
would be one!

-Dan


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