Class lsst::afw::geom::ellipses::Distortion

class Distortion : public lsst::afw::geom::ellipses::detail::EllipticityBase

A complex ellipticity with magnitude \(|e| = \frac{a^2 - b^2}{a^2 + b^2}\).

For a more complete definition, see Bernstein and Jarvis (2002); this the same as their distortion \(\delta\) (eq. 2.7).