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Subject: Re: [geda-user] Find rat lines
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On Tue, 11 Dec 2012, Peter Clifton wrote:

> Actually, I would consider the thermals / connections to pins and pads
> to be connections in the graph too, so they would be tested for the
> effect of their removal like other copper in the net.

That's a good idea.


> Polygons become easier to understand in the simpler graph case, they
> just become a multiply connected node (probably most connection edges
> are thermals linking to pin nodes).
>

Yes, this was the polygon handling case I listed as highlight the 
whole poly and let the user remove it and resolve rats. In case of a 
ground plane connected to other pins as well, this may not be the 
easiest approach. With the thermal trick, it's possible to detach 
problematic pins from the poly - but if voting goes wrong (in a VCC-GND 
short for example) we may end up with a suggestion to remove all the 
ground pins and leave VCC pins convert the ground plane to VCC plane.