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Date: Mon, 16 Jul 2012 15:43:50 -0700
From: Colin D Bennett <colin AT gibibit DOT com>
To: geda-user AT delorie DOT com
Subject: Re: [geda-user] Merge layers during print
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On Mon, 16 Jul 2012 11:21:56 -0700
Russell Dill <Russ DOT Dill AT asu DOT edu> wrote:

> 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.

OK, that's confusing since the exported gerber for 'paste' is drawn
in positive, where 'paste' is displayed.  It would be awesome if
there was a way to merge both additive and subtractive edits with a
layer.  Maybe that's too much work, perhaps it's the 90/10 rule and
your implementation already covers 90% of uses.

Regards,
Colin