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From:	geda AT psjt DOT org (Stephan =?utf-8?Q?B=C3=B6ttcher?=)
To:	gedau AT igor2 DOT repo DOT hu
Cc:	geda-user AT delorie DOT com
Subject:	Re: [geda-user] [pcb-rnd] new feature: polygon vs. polygon clearance
References:	<alpine DOT DEB DOT 2 DOT 00 DOT 1709241131030 DOT 27212 AT igor2priv>
Date:	Sun, 24 Sep 2017 13:35:00 +0200
In-Reply-To:	<alpine.DEB.2.00.1709241131030.27212@igor2priv>
	(gedau AT igor2 DOT repo DOT hu's message of "Sun, 24 Sep 2017 11:35:34 +0200
	(CEST)")
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Moin,

gedau AT igor2 DOT repo DOT hu writes:

> This enables polygons to make clearance around themsleves the same way
> as lines or arcs do. (Speaking in technical terms, the new flag,
> PCB_FLAG_CLEARPOLYPOLY is the polygon alternative to the clear-line
> flag used on lines and arcs).

I am not yet a pcb-rnd user, some what I am suggesting may already be
implemented.

Holes in polygons are parts of the polygon in pcb.  Often I'd like
to move them together with elements, so I'd prefer holes to be
independent objects.  

Use case: holes on ground planes underneath element pads that cannot
tolerate parasitic capacitance, like current feadback amplifier
inverting inputs.

Clearances could be represented as stacks of copper objects with
negative/clearance objects.  If you go that route, there may eventually
be a need for a depth attribute for all objects, which is currently
implicit: polygons are lowest, clearances in the middle, and lines/arcs
on top.

> The real reason for adding this feature was to support arbitrary
> shaped smd pads with subcircuits - the smd pad needs to be able to
> clear other polygons. Being able to draw these thick islands in a
> ground plane is just a bonus.

Gruß,
-- 
Stephan

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