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Date:	Thu, 28 Jan 2016 11:22:16 -0900
Message-ID:	<CAC4O8c8prUS=NSm_7BCwkCPntsCRRMCMu9--eXXVBtD0C4pYOg@mail.gmail.com>
Subject:	Re: [geda-user] The nature of gEDA layers
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 Thu, Jan 28, 2016 at 10:01 AM, Nicklas Karlsson
(nicklas DOT karlsson17 AT gmail DOT com) [via geda-user AT delorie DOT com]
<geda-user AT delorie DOT com> wrote:
> On Thu, 28 Jan 2016 09:28:08 -0900
> "Britton Kerin (britton DOT kerin AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com> wrote:
>
>> On Thu, Jan 28, 2016 at 2:17 AM, Stephan Böttcher <geda AT psjt DOT org> wrote:
>> > John Griessen <john AT ecosensory DOT com> writes:
>> >
>> >> On 01/28/2016 02:41 AM, Stephan Böttcher wrote:
>> >>> "Chad Parker (parker DOT charles AT gmail DOT com) [viageda-user AT delorie DOT com]"  writes:
>> >>
>> >>>> >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.
>> >>
>> >> OK.  If having generic containers for data about a pc board and an
>> >> assembly of parts onto it helps coding
>> >> be easy let's do that.  Naming and documentation needs help in PCB.
>>
>> It's highly unlikely it'll be easier for just BBVias.  I believe
>> there's already an experimental branch that implements them.  Igor is
>> likely to decide to implement them again while we all talk about it.
>> For containers to pay off several other applications for them would
>> need to exist and be important enough to get implemented.  What are
>> they?
>>
>> Britton
>
> Stephan Böttcher posted a good plan a few days ago:

Yes, I read it

> The aim should be to change PCB in small incremental steps.
>
> - Remove the assumption that all layers except "outline" are conductive.
> - Make implicit layers explicit and allow to draw on them, soldermask, solderpaste.
> - Allow more/all things inside Elements, on explicit layers.

This one in particular is not a small incremental step but a fairly
drastic change.  A lot of work is likely to be required to fix all the
points that make assumptions about Elements.  I'm not saying it's a
bad idea, but it's hard.

> - Use a mapping from Library layer names to Layout layer names.
> - Allow to draw negative objects.  Add drawing depth to the objects.
> - Represent the implicit objects explicitly, clearances, soldermask, solderpaste.
> - Make Vias more like Elements.
>
> First change the data structures, and update the tools do exactly what

Yes in principle, but for BBVia the existing structures don't
necessarily have to change.  A new type can just be added.  Then you
have to ensure that that new type interacts correctly, but you don't
have to audit everything that uses, say, Elements.

Britton

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