On 2010-10-28 18:06, Tim Cook wrote:
> Point P <c,d> on ellipse is <a*cos(T)+x,b*sin(T)+y>>> Tangent angle at P is:> If major axis is along x, atan2(d,a/cos(T)-c)> If major axis is along y, atan2(b/cos(90-T)-d,c)
err add x and y after using the point for the tangent calculations
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Tim Cook
http://empyrean.freesitespace.net
