This document discusses algorithms for clipping circles and curves to a bounding region. It describes a fast circle clipping algorithm that uses an accept/reject test to determine whether points are inside or outside the clipping region. It also discusses a midpoint circle algorithm that uses incremental steps to scan convert circles. Finally, it explains that curved objects can be clipped by first testing if their bounding rectangles overlap the clipping region before solving nonlinear equations to find curve-window intersection points.