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Date: Wed, 27 Jan 2016 09:12:58 -0900
Message-ID: <CAC4O8c81ZDSFyVk6aygf1eY0Vw3DPWO1-kzUpTF9ohXK=cpRYw@mail.gmail.com>
Subject: Re: [geda-user] The nature of gEDA users
From: "Britton Kerin (britton DOT kerin AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
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On Wed, Jan 27, 2016 at 7:43 AM, John Griessen <john AT ecosensory DOT com> wrote:
> On 01/26/2016 03:02 PM, Stephan Böttcher wrote:
>>
>>   It should be something like "expess
>> Elements and Vias as subclasses of generic containers that can include
>> anything".  It should be steps that allow to do anything that may come
>> up in the future that can be expressed in (Gerber) layers.
>
>
> Yes.
>
> On 01/26/2016 04:35 PM, Britton Kerin (britton DOT kerin AT gmail DOT com) [via
> geda-user AT delorie DOT com] wrote:
>> So you guys actually want a more strongly typed system.
>
>
> Isn't PCB already strongly typed and we'd lie a couple extra types?  Isn't
> outline, that chops
> the extents of a layer, a type?  Not sure of the terminology type.

PCB has about the minimum number of types it can have and very little
hierarchy.  With blind vias, you could either make an independent
BBViaType or something, or add a container type like people are
talking about.  BBViaType could in theory be a parent of ViaType, but
there is no ViaType, PinType is recycled for use as vias, so in
practice you'd just make it totally independent.  This approach would
be consistent with how pcb generally does things.  Adding a container
type is better in theory, but somewhat inconsistent with the pcb
approach, and its more work and not so easy to anticipate all the use
cases for the parent type.

> Layers can be 2D and valuable, and maybe they should be redefined to mean
> "corresponding to
> physical stack up layers of material that comes in sheets, or is plated or
> printed on a plane.
>
> The vertical via walls of plated metal would not be part of a layer, just
> inferred.
>
> outline would act on layers, but not be one.
>
> Attributes galore can help layers model physical reality, such that someone
> could extract/infer/construct a CSG
> 3D model from it if they wanted to.

Yes, good idea.  If layers need precise physical meaning for some
applications let them get it from attributes or something, rather than
committing to anything too specific.

Britton

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