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Mon, 14 Sep 2015 01:22:09 -0700 (PDT) | |
Date: | Mon, 14 Sep 2015 10:22:07 +0200 |
From: | "Nicklas Karlsson (nicklas DOT karlsson17 AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com> |
To: | geda-user AT delorie DOT com |
Subject: | Re: [geda-user] Apollon |
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> > The problem is that you’ll accumulate error when you have both rotations > > and translations. > > > > There's no dynamics modeling going on here, we're talking about interactive > movements of parts. So there's no error buildup and using rationals seems > to address a non-problem. If its disturbing to have 60 become 59.9999 > after two rotations put angles in bins fine enough to represent what you > need. If it's a problem if edges of a large part might alias under > different rotations, use angular bins small enough to discriminate between > adjacent cells at the far corner of your board. 1 1m board with um grid > needs maybe 10M angular bins to make a slam dunk, not so many really I would try to avoid accumulate rotations and instead say it should be rotated 60 degrees. A fine scaled grid seems reasonable and a similar approach often need to be used to compare float data values.
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