PyGeo: a dynamic geometry toolkit

u_circlepencils

array of spheric sections of the Riemann sphere

f uCirclePencil() ...

factory' function returns instance of a class representing an array of spheric sections of the Riemann sphere

constructors:
uCirclePencil (zcirclepencil )
array of spheric sections of the Riemann sphere formed by the stereographic projection to the sphere of an array of circles of the complex plane
uCirclePencil (planepencil )
array of spheric sections of the Riemann sphere formed by the intersection of planes of the given plane array with the Riemann sphere

See the source for more information.