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	Sun, 27 Dec 2015 08:31:47 -0800 (PST)
Date:	Sun, 27 Dec 2015 17:31:45 +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] Re: DRC clearance work in progress
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> "Peter Clifton (petercjclifton AT googlemail DOT com) [via
> geda-user AT delorie DOT com]" <geda-user AT delorie DOT com> writes:
> 
> > Focus on within-layer clearances for now.
> >
> > Any more complex design rules (such as dielectric breakdown through
> > the layer stack) requires more data than we have in PCB's data-model,
> > and may actually belong in a separate calculation utility that would
> > calculate out a geometric design rule that can be applied in PCB.
> 
> I am playing with the idea to build a DRC tool that works on the gerber
> output, using libgerbv and the clipper library (C++)
> 
>  http://angusj.com/delphi/clipper.php
> 
> I have made Python bindings for importing gerbers into clipper polygon
> data structures, perform bloating/shrinking and clipping operations.
> 
> Design rules would be specified as boolean operations on suitably bloated
> layer data, and anything left in the end is a violation.
> 
> An example that I have working now:
> 
>  from pyclipper import Clipper, gerbv, OffsetPolygons
>  proj = gerbv.project()
>  proj.load("v01.front.gbr")
>  proj.load("v01.plated-drill.cnc")
>  scale=10000
>  raw     = proj[0].polygons(scale)
>  drill   = proj[1].polygons(scale)
>  clip = Clipper()
>  clip.clear() 
>  clip.addsubject(raw)
>  # clean up, and remove keyholes
>  routing = OffsetPolygons(clip.union(),1)
>  # require 12 mil annuklar rings
>  annular = OffsetPolygons(drill, 120)
>  clip.clear()
>  clip.addsubject(annular)
>  clip.addclip(routing)
>  annular = clip.difference()
> 
> Any polygon left in annular is a violation.
> 
> For net specific rules I'd need to add some input that gives for each
> net at least one coordinate (per relevant layer).  And some code to find
> the polygon at the given coordinate.  Some rules, like clearance checks,
> require iterations over the individual ploygons in a layer.  At that
> point they could be tagged with a netname by the given coordinates.  And
> then there could be overrides of bloat values for specifiv nets.
> 
> I plot the ploygons with gnuplot right now.  A gerber export may be
> usefull to visualize the violations in gerbv.  Or some gui.

Great!

I think your work will would be useful within pcb to.

Simple scale will give a little bit to large distance value in outer corner, attached picture, there need to be a circle segment but it could be fixed later at any point and to large distance is usually less of a problem than to small distance.


Nicklas Karlsson

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