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Date:	Thu, 9 Jul 2015 17:50:05 -0400
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From:	DJ Delorie <dj AT delorie DOT com>
To:	geda-user AT delorie DOT com
In-reply-to:	<1436477539.1747.21.camel@ssalewski.de> (message from Stefan
	Salewski on Thu, 09 Jul 2015 23:32:19 +0200)
Subject:	Re: [geda-user] What is the hardest part in a PCB layout program?
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The hardest thing inside pcb is figuring out the right interface
between the data and the tools that manipulate it.  Some tools need
low-level geometry, like DRC or the GUI.  Others need high-level
assemblies, like microstrip routers or gerber (which needs to export
pins, not circles).  Others (like optimizers) need both.

With the right interface, adding tools is more streamlined and less
likely to interfere with other tools, with less overhead and less
duplication of code.

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