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Date:	Wed, 26 Aug 2015 10:39:45 -0400
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Subject:	Re: [geda-user] pcb file format
From:	"Evan Foss (evanfoss AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
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On Wed, Aug 26, 2015 at 6:02 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 Tue, 25 Aug 2015 17:02:10 -0400
> "Evan Foss (evanfoss AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com> wrote:
>
>> On Tue, Aug 25, 2015 at 4:37 PM, Peter Stuge (peter AT stuge DOT se) [via
>> geda-user AT delorie DOT com] <geda-user AT delorie DOT com> wrote:
>> > Evan Foss (evanfoss AT gmail DOT com) [via geda-user AT delorie DOT com] wrote:
>> >> The problem that has been consuming my mind or a few months now is
>> >> how all of this should be represented in memory.
>> >
>> > Linked lists. The overhead is small.
>>
>> Yes but you want the lists to be meaningful. Just having a list of
>> elements on a layer is not enough. The way you store the info makes
>> moving footprints or moving traces more straight forward to implement.
>
> I guess it would be possible to get different views. What is needed is a set of functions to access the data. I guess should be a need for: iterate thru the objects on one layer, iterate thru the nets, iterate thru the descriptors, extract symbols with a particular value, iterate thru symbol coordinates to renumber them left rigt, ...

Exactly. PCB currently does this only it does not have all the
information in a unified structure. It does iterate through the list
of connected items and build a netlist but things like design rules
are apparently processed in a messier way.

-- 
Home
http://evanfoss.googlepages.com/
Work
http://forge.abcd.harvard.edu/gf/project/epl_engineering/wiki/

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