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

[DJ Delorie <dj@xxxxxxxxxxx>]

> The linear "stretching" transformation (x', y') = (a*x, b*y) applied
> to a circle yields an ellipse whose axes are parallel to the
> coordinate axes.

Yes, *unless* you're including the start/end angles in that
transformation, instead of applying them afterwards.

http://www.delorie.com/pcb/tmp/stretched-arc.pcb

This shows two 45-degree Arcs.  One has width==height, the other does
not.  Note that the end angle on the stretched arc is 45, but the
arc does not end at the 45 degree marker.


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