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	Thu, 28 Jan 2016 04:04:09 -0800 (PST)
Date:	Thu, 28 Jan 2016 13:04:07 +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 (forgot board layer)
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> >> >My experience has always been that hard to read spaghetti code is the
> >> >result of dealing with special cases that arise from having data structures
> >> >and functions that weren't designed quite right. Making things more generic
> >> >reduces the number of special cases and allows for the maximum reuse of
> >> >structures and functions.
> >> >
> >> >As I stated in my opening remark, feel free to take or leave my
> >> >suggestions. Obviously I think it would be wise to heed them
> > So do I.

> So, if one generic container of data holds a 2D conductor on insulator pattern, and one holds
> solder mask and one holds top-to-bottom-via connectivity they don't all get talked about as layers or it
> is confusing.

I forgot the board layer. As is now board is usually modeled by an outline and via/pin which may or may not have plated edges. via/pin is handled a little bit different from other drawing primitives and are not added as drawing primitives to a particular layer although it is well known they make a circular cut out in all board layers.

Someone suggested an extra connectivity layer and for an ordinary plated hole the annular ring plated on the hole edges connect all layers. Any drawing primitive on a copper layer overlapping this annular ring will connect. Basically these annular rings are at same mechanical position as board. A proper model of the layer would require two layers of different material at same mechanical position: board with drilled holes which are equal to round cut out and a layer with annular rings connecting layers.


Nicklas Karlsson

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