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X-Recipient:	geda-user AT delorie DOT com
Date:	Sun, 24 Sep 2017 11:35:34 +0200 (CEST)
X-X-Sender:	igor2 AT igor2priv
To:	geda-user AT delorie DOT com
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From:	gedau AT igor2 DOT repo DOT hu
Subject:	[geda-user] [pcb-rnd] new feature: polygon vs. polygon clearance
Message-ID:	<alpine.DEB.2.00.1709241131030.27212@igor2priv>
User-Agent:	Alpine 2.00 (DEB 1167 2008-08-23)
MIME-Version:	1.0
Reply-To:	geda-user AT delorie DOT com

Hi PCB designers,

some boards need a lot of copper: so much that it looks like if the whole 
bottom layer was just copper with a few gaps drawn to form islands. A new 
way of drawing this with pcb-rnd is enabling polygon-vs-polygon clearance, 
as demonstrated in the 2-minutes video at:

https://archive.org/details/poly-clear-poly


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).

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.

Regards,

Igor2

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