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Date:	Mon, 17 Aug 2015 09:49:21 -0600
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Subject:	Re: [geda-user] PCB footprints - what is the best way to change
	origin location on existing footprint?
From:	"Dave Williams (dave DOT williams DOT lists AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
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Maybe an example will help.  Take a standard 805 footprint from one of the
packaged libraries.

Element["" "Standard SMT resistor, capacitor etc" "" "0805" 2850.00mil
2600.00mil -31.50mil -31.50mil 0 100 ""]
(....

)

My understanding is the origin is located at (2850.00mil,2600.00mil).  And
the reference designator is positioned at (-31.50mil,-31.50mil) relative to
the origin.  How does one interpret these (2850.00mil,2600.00mil) numbers
for the
origin?

I understand the purpose of the diamond origin - and I can change the
location of the origin graphically - but what do
the 'coordinates' mean?

Dave

On Sun, Aug 16, 2015 at 11:50 PM, DJ Delorie <dj AT delorie DOT com> wrote:

>
> > But now I'm curious, what does a 0,0 value for the origin actually
> > mean?  Relative to what?
>
> The footprint's origin is not "relative" to anything else, it's what
> everything else is relative to.
>
> When you place a footprint, the origin of the footprint is placed at
> the point where the crosshair is when you insert it.  I.e. you can
> think of this as the "paste point" too.
>

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<div dir=3D"ltr"><div><div><div><div><br>Maybe an example will help.=C2=A0 =
Take a standard 805 footprint from one of the packaged libraries. <br></div=
><br>Element[&quot;&quot; &quot;Standard SMT resistor, capacitor etc&quot; =
&quot;&quot; &quot;0805&quot; 2850.00mil 2600.00mil -31.50mil -31.50mil 0 1=
00 &quot;&quot;]<br>(....<br><br>)<br></div><br>My understanding is the ori=
gin is located at (2850.00mil,2600.00mil).=C2=A0 And the reference designat=
or is positioned at (-31.50mil,-31.50mil) relative to the origin.=C2=A0 How=
 does one interpret these (2850.00mil,2600.00mil) numbers for the <br></div=
><div>origin?<br><br></div><div>I understand the purpose of the diamond ori=
gin - and I can change the location of the origin graphically - but what do=
 <br>the &#39;coordinates&#39; mean?<br></div><br></div>Dave<br></div><div =
class=3D"gmail_extra"><br><div class=3D"gmail_quote">On Sun, Aug 16, 2015 a=
t 11:50 PM, DJ Delorie <span dir=3D"ltr">&lt;<a href=3D"mailto:dj AT delorie DOT c=
om" target=3D"_blank">dj AT delorie DOT com</a>&gt;</span> wrote:<br><blockquote c=
lass=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;=
padding-left:1ex"><span class=3D""><br>
&gt; But now I&#39;m curious, what does a 0,0 value for the origin actually=
<br>
&gt; mean?=C2=A0 Relative to what?<br>
<br>
</span>The footprint&#39;s origin is not &quot;relative&quot; to anything e=
lse, it&#39;s what<br>
everything else is relative to.<br>
<br>
When you place a footprint, the origin of the footprint is placed at<br>
the point where the crosshair is when you insert it.=C2=A0 I.e. you can<br>
think of this as the &quot;paste point&quot; too.<br>
</blockquote></div><br></div>

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