I have an ellipse with known major radius $r_x$ and minor radius $r_y$, aligned with the x- and y-axis.
Given a tangent point $T$ and the tangent angle $\alpha$, how do I calculate the center $C$ of this ellipse?
with a circle the equation is easy:
C_x = x - radius * cos ( tangent-angle - 90° ) C_y = y - radius * sin ( tangent-angle - 90° )
But for an ellipse this does not work.
(My goal is oriented hough transformation for ellipses)