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To: geda-user AT delorie DOT com, John Doty <jpd AT noqsi DOT com>
Subject: Objects of objects (was Re: [geda-user] The state of gEDA/gaf (Was gEDA/PCBs diversity, Was: Pin hole size))
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Comments: In-reply-to John Doty <jpd AT noqsi DOT com>
   message dated "Mon, 29 Oct 2012 15:19:40 -0600."
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Message-Id: <20121031090732.A88298117B46@turkos.aspodata.se>
Date: Wed, 31 Oct 2012 10:07:31 +0100 (CET)
From: karl AT aspodata DOT se (Karl Hammar)
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John Doty:
> On Oct 29, 2012, at 2:53 PM, Dave McGuire wrote:
> > On 10/29/2012 04:38 PM, John Doty wrote:
...
[about pcb]
> >> To me, the conceptual mess remains. As I said, it's like driving
> >> through downtown Boston: it's all random special cases, no
> >> structure.
> >  I dunno.  The boards I make with it work just fine.  Why do I never
> > run into these limitations, when I use PCB very frequently, while you, a
> > person who just said they don't lay out their own boards, see all of
> > these horrible problems?
> 
> I can't grok all the magic properties of its peculiar set of
> abstractions. "Polygon" doesn't mean a geometric object and
> "elements" are not elementary.

> The idea that objects are composed of objects composed of objects, ... is missing.
...

This kind of recursion is missing from gschem also, or rather from
the sch/sym file formats.

You can get it - sort of - by special casing a symbol with a
source attribute.

///

The above kind of recursion would be nice to have, are people positive
to a discussion that would lead to an implementation of it ?

Hälsningar,
/Karl Hammar

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