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Date: Tue, 8 Oct 2013 08:33:37 -0500
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Subject: Re: [geda-user] polygons, arcs and footprints
From: Evan Foss <evanfoss AT gmail DOT com>
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Precedence: bulk

If your going to go about it that way then why use rectangles you
could just as easily use stroke.

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?

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.



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