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Date:	Mon, 16 Jul 2012 11:21:56 -0700
Message-ID:	<CAN0Jx-8WmiNiD_SHoeNRZK72QP+zZwGB8KgtaK4hDP+H6SRQ-w@mail.gmail.com>
Subject:	Re: [geda-user] Merge layers during print
From:	Russell Dill <Russ DOT Dill AT asu DOT edu>
To:	geda-user AT delorie DOT com
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On Mon, Jul 16, 2012 at 10:41 AM, Colin D Bennett <colin AT gibibit DOT com> wrote:
> On Mon, 16 Jul 2012 09:44:20 -0700
> Russell Dill <Russ DOT Dill AT asu DOT edu> wrote:
>
>> So in my case I want a couple of holes in the paste stencil to
>> line up with a couple of unplated drills. So I make a new layer,
>> set skip-print to 1, and set merge to toppaste, then add a couple
>> of zero length traces that line up with the drill holes.
>
> So the 'merge' feature is acting in a 'negative' way?  Since the
> toppaste layer is where paste DOES go, you are drawing on the new
> layer and then SUBTRACTING this layer from the toppaste layer?
> On the other hand, your 'fab-notes' example suggests an additive
> method of merging.  I didn't read all the code, but how is this
> achieved?

The feature doesn't care, it depends on what the meaning of the layer
is. Both mask and paste are "negative" layers depending on how you
think about them. Drawing on the paste layer gives you holes in the
stencil, but thinking about it from a paste perspective, gives you
positive paste.

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