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Date:	Tue, 8 Oct 2013 08:13:22 -0500
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Subject:	Re: [geda-user] polygons, arcs and footprints
From:	Russell Dill <Russ DOT Dill AT asu DOT edu>
To:	geda-user AT delorie DOT com
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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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