A JavaScript library for ellipse fitting

This example computes equation of the best fitting ellipse of point set (0,0), (1,0), (0,2), (2,1), (2,4)

var ellipse = new Ellipse();
ellipse.setFromPoints([{x:0, y:0}, {x:1, y:0}, {x:0, y:2}, {x:2, y:1}, {x:2, y:4}]);
ellipse.printEquation();

Prints +0.743x^2 -0.557xy +0.371y^2 -0.743x -0.743y +0 = 0

Each component can be accessed independently using ellipse.a, ellipse.b, ellipse.c, ellipse.d, ellipse.e.