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Date: Sat, 9 Jan 2016 18:31:26 +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] (features: layers stack, padstack/vias)
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On Sat, 09 Jan 2016 10:14:06 +0100
geda AT psjt DOT org (Stephan Böttcher) wrote:

> "Lev (leventelist AT gmail DOT com) [via geda-user AT delorie DOT com]"
> <geda-user AT delorie DOT com> writes:
> 
> > On Fri, 8 Jan 2016 17:52:59 +0100
> > "Nicklas Karlsson (nicklas DOT karlsson17 AT gmail DOT com) [via
> > geda-user AT delorie DOT com]" <geda-user AT delorie DOT com> wrote:
> >
> >> In preferences-->Layers-->Groups some of the layers are listed but
> >> not all are listed. What do you think is missing?
> >
> > I would add explicitly the insulation layers, and documentation layers, silks,
> > etc. I'd add user defined layers as well. I'd add some logic like "XOR this
> > layer with that, and use it as conductive 2."
> 
> I'd prefer the format/data model to become more general and orthogonal,
> not more explicit layer types.  All layers that need to be described
> needs an explicit entry in the layerlist and can be drawn on.
> 
> If you want to draw on an insulation layer, just add it.  If you do not
> want to draw on it, there is little reason to add it.  It should not be
> required to describe the board, unless the data model/format lacks other
> attachment points for its dialectric properties attributes.
> 
> NB: Since the primary target export is Gerber, I propose to implement
> the level concept from that standard somehow.  Each object shall be
> explicitly assigned to a layer, and a level on the layer.  Even levels
> draw, odd levels clear. Standard library level assignment could be:
> 
>   level 10: polygons
>   level 25: holes in polygons
>   level 35: clearances around lines
>   level 40: lines.
>   level 50: pads
> 
> A Line object would not need to include its clearance directly, but
> there would be a second line on the clearance layer.  But those two
> objects must be linked to each other both in the file format and the
> data model, so maybe that is not a good idea.
> 
> OTOH, generic compond objects are require too, for Vias, Elements, and
> hierarchy, why not for Lines and Arcs as well?
> 
> In other words, please think more generic not more special case.  The
> GUI shall encapsulate all that with more specialized tools and
> defaults.   
> 
> Line( (("attribute" value) ...) (("layer1" level1 width1) ("layer2" level2 width2) ...) ((x1 y1) (x2 y2) ...) )
> 
> -- 
> Stephan

I agree. With a few drawing primitives, layers and suitable grouping it should be possible represent everything in pcb. As is now only a few pin/pad/via which cover almost all cases on an ordinary circuit board are possible but they have limitations.

Nicklas Karlsson