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Date: Tue, 8 Oct 2013 09:11:44 -0500
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Subject: Re: [geda-user] polygons, arcs and footprints
From: Russell Dill <Russ DOT Dill AT asu DOT edu>
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On Tue, Oct 8, 2013 at 8:33 AM, Evan Foss <evanfoss AT gmail DOT com> wrote:
> If your going to go about it that way then why use rectangles you
> could just as easily use stroke.

I'm not sure what you mean, the only reference I can find in PCB in
reference to stroke seems to be related to gesture control.

> I though arbitrary rotate of rectangles was not allowed in the pcb
> format. It does not work from the gui of the version I am using. Is
> that a bug?

Because they aren't actually polygons, a "square" below is just a
primitive that ends up getting implemented in the backend with a PCB
pad/trace.

> On Tue, Oct 8, 2013 at 8:13 AM, Russell Dill <Russ DOT Dill AT asu DOT edu> wrote:
>> On Fri, Oct 4, 2013 at 4:56 PM, Evan Foss <evanfoss AT gmail DOT com> wrote:
>>> Hi folks,
>>>
>>> I am trying to make a footprint for an LTC3441. The bottom pad is a
>>> polygon. I know they are not possible in PCB footprints but does
>>> anyone have a good way to emulation one?
>>>
>>> Also I am trying to use a MEMS microphone that uses a ring to seal it
>>> to the PCB. Again I know that does not exist but is there a way around
>>> it?
>>
>> A ring is a little more complicated, but here's an example of a funny
>> ring pad shape
>>
>>     w = dmath.sin(dmath.radians(angle / 2)) * 2
>>     h = m.radius * dmath.cos(dmath.radians(angle / 2))
>>     piece = pscad.up(h) + pscad.square((w + m.width, m.width),
>> rounded=True, center=True)
>>     ret = []
>>     for i in range(0, m.n):
>>         ret.append(pscad.rotate(i * 360 / m.n) + piece)
>>     return pscad.union() + tuple(ret)
>>
>> Attached is a single pad with the above pattern with n == 20, width ==
>> 0.1mm, and radius == 1.0mm.
>
>
>
> --
> Home
> http://evanfoss.googlepages.com/
> Work
> http://forge.abcd.harvard.edu/gf/project/epl_engineering/wiki/