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	Wed, 18 May 2016 15:22:45 -0700 (PDT)
Date:	Thu, 19 May 2016 00:22:40 +0200
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
Cc:	Peter Clifton <petercjclifton AT googlemail DOT com>
Subject:	Re: [geda-user] response about DRC stuff
Message-Id:	<20160519002240.5ff52f8cfdae85db0595a24d@gmail.com>
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This is a multi-part message in MIME format.

--Multipart=_Thu__19_May_2016_00_22_40_+0200_zM+o7cCV5lI_rFPo
Content-Type: text/plain; charset=US-ASCII
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Attached file which is a C file, it currently have no connection with real code although comments may be useful.

Clearance is checked between all combionations of nets. Since there is a function to figure out clearance value used between each combination of nets it should be simple to add netclasses.

Clearance precedence which may be shown graphically as hierachy is probably a good solution: global default value, net classes, between individual nets.

It would be possible to extend to between different layers and for individual drawing primitives if needed.


Nicklas Karlsson



> >> Do you think that between us we can work out a plan to hit improved DRC for
> >> multiple netclass with different clearance rules? I will probably make some
> 
> How are you intending to do this?  It might be easiest to just re-run the entire
> DRC with different settings, then throw out everything that doesn't involve
> objects with different netclasses.  This is maybe a little hackish but DRC is
> already sort of due for a rewrite anyway.  I guess this wouldn't help with
> incremental if that's your preferred way.
> 
> However as John has pointed out in the past existing DRC is no good between
> layers etc. so depending on what you want to do this might not be enough.
> I think fixing DRC to be fully conscious of interlayer interactions
> might be better
> done with a rewrite than by trying to change the existing stuff.
> 
> Britton

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