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Date:	Tue, 8 Oct 2013 10:13:09 -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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Sorry I meant ElementLine.

On Tue, Oct 8, 2013 at 9:11 AM, Russell Dill <Russ DOT Dill AT asu DOT edu> wrote:
> 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/



-- 
Home
http://evanfoss.googlepages.com/
Work
http://forge.abcd.harvard.edu/gf/project/epl_engineering/wiki/

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