X-Authentication-Warning: delorie.com: mail set sender to geda-help-bounces using -f X-Recipient: geda-help AT delorie DOT com To: geda-help AT delorie DOT com From: Carlos Moreno Subject: [geda-help] Orientation of components in X-Y (centroid) files Message-ID: Date: Fri, 16 Dec 2016 16:02:33 -0500 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.5.1 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit 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 --