Re: Proposal for the geometric engine, RFC

[Dylan Paul Thurston <dpt@math.berkeley.edu>]

On Wed, Mar 15, 2000 at 08:33:46AM -0800, Dylan Paul Thurston wrote:
> ....  There seem to be some numerical stability problems when the
> three points are nearly collinear, and it seems that the circle
> disappears altogether if the points are exactly collinear. ...

On further investigation, this seems to be only a drawing bug.  Even
when the points are exactly collinear (to screen resolution),
intersections with other lines are drawn (nearly) correctly, existing
and not existing when appropriate.

The bug is that nearly straight arcs don't end on the points they're
supposed to end at.

Best,
	Dylan Thurston