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Date: Tue, 2 Feb 2016 19:35:14 +0100
From: "Nicklas Karlsson (nicklas DOT karlsson17 AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
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Subject: Re: [geda-user] The nature of gEDA layers
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Precedence: bulk

> > Now I got it, depth is useful to mix dark and clear. It is useful for
> > example to draw thermals but ror the most cases it should not be
> > needed.
> 
> Almost every copper trace will be have a polygon clearance attached.
> 
> Line {
>   Attribute{routingstyle="default"},
>   Path{(x1, y1), (y2,y2), ... },
>   Stroke{ layer="top", ends=round, depth=100, width=10mil },
>   Stroke{ layer="top", ends=round, depth=-500, width=30mil },
> }

It would make most sense to assign routing style per net although on a few occacions every now en then it useful per trace. One example is current shunt there signal traces are run separate with a lot thinner width.

Even tough it proceed slowly I have started to look at different clearance values for different nets. There will be a need for each net with a polygon clearance for each other net which may be optimized to each other net with polygon on current layer. I am planning routing style or at least clearance values per net. For an inverter logic is usually connected to the negative potential and for logic signal levels close to this voltage only a small clearance is needed. Between negative and positive rectified value their is need for larger clearance. Between any of the high voltage traces and protective earth there is legal requirements of minimum clearance.

> A polygon would be at depth=900.  The Line{} first clears a hole into
> the polygon and then draws a trace into the hole.  The hole would not
> cut through other lines or pads, only through the polygon below.

I think pcb/gpcb need to keep track of polygon depth automatically. Any copper object may make a cut out of clearance value larger then copper drawing primitive in a polygon but not in any other object. For drawing thermals or if needed other such more complicated objects I guess there is a need for local depth but can't, or is knowledge of polygon depth needed to get thermals correct for example then intersecting edge of polygon? Or for a close trace?

> Same for Vias stacks.  If you edit such an object, it would make a copy.
> But if you edit the routing style, all objects still referring to it
> would change.  The routing style tool would ask if you intend to change
> those 423 objects, or better bump the serial number of the style and
> keep those objects to refer to the old values.

Sound perfect although I do not understand why serial number need to be bumped to keep old values.


Nicklas Karlsson