Posted by Mike Hayes on Mar 12, 2015; 4:09pm
URL: https://forum.librecad.org/Isometric-Circles-tp5711165p5711181.html

I understand that what you are saying about the possible solutions to an ellipse inscribed in a quadilateral is correct in terms of pure mathematics.

However, the point is that the "Draw Ellipse Inscribed in a Quadrilateral" tool already does work with a rectangle. The only problem with the tool is that it seems to want the four sides to be selected in a paricular sequence as described in my previous post.

So I'm guessing the code behind the tool is already doing something extra to create a unique solution. Perhaps it is making the ellipse touch the midpoints of the four selected lines?

Mike