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Date:	Thu, 31 May 2012 00:30:02 -0700
From:	Colin D Bennett <colin AT gibibit DOT com>
To:	geda-user AT delorie DOT com
Subject:	Re: [geda-user] Odd Behavior Around Vias
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On Thu, 31 May 2012 01:13:30 -0400
Gus Fantanas <fantanas AT innocent DOT com> wrote:

> I am using the gEDA package from the repos of Ubuntu 12.04LTS.  I 
> finished a layout in PCB, but afterward I had to increase the
> total pad diameter around some vias at the request of the fab
> house.  After I did that FROM THE COMMAND WINDOW, the clearance
> of two vias (which just had the pad size increased) from the
> ground plane SHRANK to accommodate the increased pad diameters.
> The ground plane on that board was connected polygons to minimize
> parasitic capacitances at a couple of spots; the ground plane was
> at considerable distance from each of the two vias, except in one
> direction.  After increasing their pad diameter, the clearance
> region of each via should have "eaten into" the ground plane, but
> that did not happen.

I tested this on my Ubuntu 12.04 install using the pcb program from
the Ubuntu repository (version 20110918-4), and at least with a
quick test, pcb is working right.  I create a via (default
settings: 36 mil copper diameter, 20 mil drill hole, 10 mil
clearance to polygons), draw a rectangle flood surrounding it, and
observe a 10 mil clearance around the via. Select via,
enter :ChangeSize(selected, +2mil).  As expected, clearance gap is
still 10 mil, though the copper diameter has increased to 38 mil.
I tried changing the drill size as well, and it worked as
expected.  It must be some deeper and sneakier bug, unfortunately.

>...
> their pads further) the clearance check from the ground plane
> "woke up."  Pressing CTRL-S on each via to reverse the previous
> increase MAINTAINED PROPER CLEARANCE!

I assume you mean Shift-S to reverse the size change since Ctrl-S
is Save Layout.

Regards,
Colin

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