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Tue, 08 Oct 2013 07:11:44 -0700 (PDT) | |
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Date: | Tue, 8 Oct 2013 09:11:44 -0500 |
Message-ID: | <CAN0Jx-8KQPU4cRbYz1Z1jouTnghSGkJmH_2Fc_2siEKw0RQzgw@mail.gmail.com> |
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 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/
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