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Date: Tue, 29 Nov 2011 14:16:58 -0800
From: Colin D Bennett <colin AT gibibit DOT com>
To: geda-user AT delorie DOT com
Subject: Re: [geda-user] Mathematics of the arc element in pcb.
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On Mon, 28 Nov 2011 17:39:13 +0100
myken <myken AT iae DOT nl> wrote:

> On 27-11-11 23:15, Andrew Poelstra wrote:
> > Officially, pcb does not support stretched arcs for these
> > reasons.
> >
> > If you're willing to donate some time and numerical analysis to
> > get this stuff working well, that'd be wonderful. Peter C. has
> > suggested just getting rid of arcs and using bezier curves for
> > everything, but you can't do elliptical arcs with bezier
> > curves :(
> >
> Ok, thanks.
> For now I will assume WIDTH != HEIGHT is not supported. Which
> basically means pcb only supports circles or parts of a circle.
> Is there a need or wish for proper working arc's? If so, why?

To be precise, pcb does fully support arcs, in that it
supports a _circular arc_ (a segment of a circle).

However, an _elliptical arc_ (segment of an ellipse), is not
officially supported, even though partial internal support for
something like a 'stretched circular arc' does exist.

Regards,
Colin