Re: gEDA-user: Rotating Components

[Bob Paddock <bob.paddock@xxxxxxxxx>]

On Friday 08 June 2007 15:05, DJ Delorie wrote:

> The syntax is :FreeRotateBuffer(degrees)
> 
> Note that the autorouter and optimizer don't yet like rotated pads.
> 
> It's also a bad idea to use lots of small rotations on the same
> buffer; the errors accumulate.

"Quaternions quickly transform coordinates without error buildup"
http://www.edn.com/archives/1995/030295/05df3.htm
http://en.wikipedia.org/wiki/Quaternion

Quaternions predate Calculus.  They are used in places
where you can not have error buildup, like Stewart Platforms,
3D graphics etc.



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