Posted by dxli on Mar 13, 2015; 11:55am
URL: https://forum.librecad.org/Isometric-Circles-tp5711165p5711186.html

Identified two bugs:

1 get line intersection tolerance issue
2 get eigen vectors for quadratic failed(rectangular case)

This symmetric trapezoid needs new implementation, I will investigate

stranger573 wrote

Mike Hayes wrote

...
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?
...

The area of the inscribed ellipse (and other objects) should be the maximum. For this there is only one solution.
I believe that this is a solution for isometric circles too.

Midpoint is not good idea. Example: