X-Authentication-Warning:	delorie.com: mail set sender to geda-user-bounces using -f
X-Recipient:	geda-user AT delorie DOT com
X-Original-DKIM-Signature:	v=1; a=rsa-sha256; c=relaxed/relaxed;
	d=gmail.com; s=20120113;
	h=date:from:to:subject:message-id:in-reply-to:references:mime-version
	:content-type:content-transfer-encoding;
	bh=VV/4vdJclYGxFip0MCDbm+w1hlQLzN3Y9urH2lfdXMc=;
	b=V3jFkLL/qP/zf9vw7IaS+/vXUsfGKeVIf+xWi36fQTmHZ+tXIzk5wDtHL+u3dOXS1H
	79B+BMEhP8uafn3zyP6Z9wGEmkxgw3MgJTrqQN5bhdEtRg+25E2CfHl6ii96E4Kgf8vf
	MP5AWph4GVXOgNg5Grur60LtFwNmjMe1Gsas7ZJsbBeRVFZJHH0dq/Jpaa1okde8hFBn
	NcI4wWrgXGR5+IcyivCdTHcnAdzMPTV3QOwDw2WgWhwHEXBBFUlqEU1KENPwlFUWHTMD
	eFEZ7sPRBBFMBoL4mYzqQgEhNyPyzBsC2J3XeQYxWztOckjOILrL9Ndb85dyag9NlgMn
	XARg==
X-Google-DKIM-Signature:	v=1; a=rsa-sha256; c=relaxed/relaxed;
	d=1e100.net; s=20130820;
	h=x-gm-message-state:date:from:to:subject:message-id:in-reply-to
	:references:mime-version:content-type:content-transfer-encoding;
	bh=VV/4vdJclYGxFip0MCDbm+w1hlQLzN3Y9urH2lfdXMc=;
	b=Z93vTo9XVlaFcNGUm3TF0lSWPLCAGAZ1MW27rQsh6U4XUmzb9wB/O6PSD82MHG3eYD
	grGWin+nWqwOFC1v23IK5F5xTI4Hjydb4OvB7Yc0+UDLbGoPzxfJVsRF21Rmdd0Y5VJ+
	0NsaWmVN01mPZzZvqbXD/YqZ5us0Nq80ThmA5iHJgvokBvyruHpFEQdH7n7z3kuHgGPj
	uWHBBQkhd13qa2b0Z2YLP8fLwhlpYod2f9vD1Lkr9szJDG/wHKF1U1IcT1LxAQMFnBOb
	Ytm/VAuyY2PxjXt/aUKBdaoKNocXWFY4krqNzGPLoOhmnnSnxWsDLzQaAgO5LRUZbgOJ
	FnzQ==
X-Gm-Message-State:	AG10YOQt0HJpau5cm08L2uO+3Iu6OLPLcxT8APW9QxaKxzdyjfMlkQ3U3aipVgPNHtMv3A==
X-Received:	by 10.28.146.145 with SMTP id u139mr3754647wmd.81.1453996163882;
	Thu, 28 Jan 2016 07:49:23 -0800 (PST)
Date:	Thu, 28 Jan 2016 16:49:22 +0100
From:	"Nicklas Karlsson (nicklas DOT karlsson17 AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
To:	geda-user AT delorie DOT com
Subject:	Re: [geda-user] The nature of gEDA layers
Message-Id:	<20160128164922.7bd920859ab8462f8abb0f40@gmail.com>
In-Reply-To:	<CAJZxidD7=NE+Q3FGOU+ER3Xh7TRskEPRTKa=yrwUm51_VaYw0A@mail.gmail.com>
References:	<alpine DOT DEB DOT 2 DOT 00 DOT 1601180756390 DOT 9035 AT igor2priv>
	<CAC4O8c-ZyNnCzCDHXkYYabSD4fG8vf+CKmhMycNJujGMPKzQDQ AT mail DOT gmail DOT com>
	<s6nr3h49hrq DOT fsf AT blaulicht DOT dmz DOT brux>
	<DDB07351-7C94-4B5C-99FA-83750CD4592A AT noqsi DOT com>
	<20160126233332 DOT dec2f06f5c74354a3841989c AT gmail DOT com>
	<s6n1t93h4ub DOT fsf AT blaulicht DOT dmz DOT brux>
	<20160127091746 DOT 1c7a976c2752f913921688ac AT gmail DOT com>
	<s6npowne74w DOT fsf AT blaulicht DOT dmz DOT brux>
	<20160127141334 DOT c738feb9dbeb54a7dec3dff8 AT gmail DOT com>
	<s6n37tjt1tv DOT fsf AT falbala DOT ieap DOT uni-kiel DOT de>
	<56A8F74B DOT 8080304 AT ecosensory DOT com>
	<CAC4O8c9UKLsh5FAAwUMEtHThKH-w3gUmCU2i9dRW9igkyRt-TQ AT mail DOT gmail DOT com>
	<CAJZxidDmjMtd_fKvR5qZVRa+hwDUbvfaz79oZjkBgDuE1m8RBg AT mail DOT gmail DOT com>
	<56A961BC DOT 3040405 AT ecosensory DOT com>
	<CAJZxidC=nbxAinOtpfGHHqwPXbEMrhfat7jKgA9KBp3EVVg4_Q AT mail DOT gmail DOT com>
	<s6nbn863xlu DOT fsf AT blaulicht DOT dmz DOT brux>
	<56A9E416 DOT 8080500 AT ecosensory DOT com>
	<20160128124020 DOT 8f2f33210481f637a696f5d0 AT gmail DOT com>
	<CAJZxidD7=NE+Q3FGOU+ER3Xh7TRskEPRTKa=yrwUm51_VaYw0A AT mail DOT gmail DOT com>
X-Mailer:	Sylpheed 3.5.0beta1 (GTK+ 2.24.25; x86_64-pc-linux-gnu)
Mime-Version:	1.0
Reply-To:	geda-user AT delorie DOT com
Errors-To:	nobody AT delorie DOT com
X-Mailing-List:	geda-user AT delorie DOT com
X-Unsubscribes-To:	listserv AT delorie DOT com

> I wouldn't include inter-layer connectivity as a layer. I think that's a
> fundamentally different idea. I would suggest implementing connectivity
> within a footprint/pattern/group as something like a netlist. pcb
> implements connectivity awareness for other reasons, so you might as well
> reuse the idea here. But I think that is a discussion for a different
> thread.

As is now plating flag solve connectivity problem. It is possible to figure out the geometry of the plating between layers from the cut out shape and plating flag. To include inter-layer connectivity as a layer would however probably not be a good idea because of the problem involved in working other direction.

> ..., I do think you call a drill
> drawing a layer ...

As is now the drill in practice end up as a circular cut out on all layers except if plugged via or other special technology is used. A drill drawing would more or less belong to board layer(s).

> > A layer is a flat surface made of particular material for example: copper
> > foil, solder mask, insulating board.
> 
> 
> My suggestion is that you modify your statement slightly and replace "A
> layer is a flat surface..." with "A layer -represents- a flat surface".

Yes "A layer -represents- a flat surface" is a better expressed.

> ... A circular piece of copper could be in a group/pattern
> container (e.g. a component footprint) and also in a layer container. You
> would be able to access the primitive from either container.

I agree.

> Yes, I completely agree. You could even have multiple drill layers if you
> wanted to. For example, a drill layer for the top side, a drill layer for
> the bottom side, and drill layers for any or all inner layers. This could
> be useful in implementing blind/buried vias.

Drill belong to board layer as circular cut out. As is now drill make a circular cut out in all layers. For blind/buried vias it would be a circular cut out only in some layers. Even though drill belong to board as circular cut out it may create a problem to tell which layers should be drilled for a buried/blind via if starting point is knowledge is about which layers should be connected but with possibility to update already used via it should probably work fine.

> The via editor will help the user to define all required via layers
> >
> and apply designrules that test for manufacturability.
> >
> 
> I would just say footprint/pattern editor. A via is really no different
> from a footprint/pattern when it comes down to it.

Yes, there is a difference how and then they are used although otherwise it would be good if all drawing primitives are available for all of them and then same editor would be natural.

> --Chad


Nicklas Karlsson

- Raw text -