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To:	geda-help AT delorie DOT com
From:	Carlos Moreno <moreno+geda-help AT mochima DOT com>
Subject:	[geda-help] Orientation of components in X-Y (centroid) files
Message-ID:	<cc0d85d7-870f-23a6-c212-1ff753a30df4@mochima.com>
Date:	Fri, 16 Dec 2016 16:02:33 -0500
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Reply-To:	geda-help AT delorie DOT com

Hi,

How do we define the angle (the orientation) in the X-Y or centroid
file?  In particular, what is the convention / reference angle for 0
degrees?

I understand that from the point of view of the coordinates system,
zero degrees means along the x-axis.   However, from the point of
view of the component, what is zero degrees?

I would assume there are some universal conventions;  for example,
for IC's, I suspect that zero degrees means the chip with pin 1 to
the top-left corner  (does it indeed?).  But for example, for a 0805
surface-mount component --- does zero degrees mean width = 08
and height = 05, or vice-versa?  And in general, what is the rule?


Though I guess this is a question that the specific PCB manufacturers
should answer, I haven't gotten a straight answer from them, so I
figure you guys may share some insights based on your experience
with manufacturers?

Thanks,
Carlos
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