Re: gEDA-user: pcb GL can't render stretched arcs

[Andrew Poelstra <asp11@xxxxxx>]

On Thu, Jul 14, 2011 at 08:29:53PM +0200, Karl Hammar wrote:
> Looking at pcb.pdf, page 64, section 8.8.1 Arc...
> 
> Andrew Poelstra:
> ...
> > If you have a full ellipse, then Width and Height are exactly
> > what they sound like -- the full length from one side of the
> > ellipse to the other.
> 
> The file format specifies it as:
> 
>   Width Height
>    The width and height, from the center to the edge. ...
> 
> Are you saying that the parser etc. is doubling it?
>

Oh, my bad! I had checked manually what it did yesterday,
and misremembered the behavior.

You are right, Width and Height are the distance from the
center to the edge.
 
> > There is no way right now to rotate the ellipse, so alpha
> > from the site you cited is always 0.
> ...
> 
> And there is no way to specify a "slanted" ellipse in the file format
> either, so if we really want ellipses, the file format is incomplete
> and should be changed.
> 
> Why not just give a warning if width and height is not equal, saying
> that we don't really support ellipses for the moment, and be done with
> it.
> 

I could, I suppose, but as you mentioned in another post, there
are muddled physical units. As that is what I am trying to fix,
I need to make changes anyway.

It would be nice if we could at least support the featureset of
our file format, while I'm at it.

-- 
Andrew Poelstra
Email: asp11 at sfu.ca OR apoelstra at wpsoftware.net
Web:   http://www.wpsoftware.net/andrew/



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