CosmoSim is a simulator for gravitational lensing.
The source model is entirely separate from the lens and simulation
models. It implements a single function getImage() which returns
the source image as an OpenCV Mat object.
The Source class is the superclass of all source modesls. The constructor takes an integer argument $\sigma$, giving the size which is interpreted somewhat differently for the different subclasses. The subclasses may take additional parameters to the constructor, in addition to the integer size.
SphericalSource takes $\sigma$ which is the standard deviation in
the Gaussian distribution of the source mass.EllipsoidSource takes $\sigma$ and $\sigma_2$, analogous to $\sigma$ above,
giving the size along the major and minor axes, as well as a rotation $\theta$.TriangleSource takes $\sigma$, now interpreted as the size, and
the rotation $\theta$.ImageSource takes an image file which is used as the source image, in addition
to the size parameter $\sigma$.