1. A method for converting a set of two-dimensional inputs, each of which substantially corresponds to a distance and a trajectory, into a set of one-dimensional inputs for a computing system, the method comprising the steps of: determining a current chirality of the set of two-dimensional inputs, wherein the current chirality has a first sense if the set of two-dimensional inputs exhibits a primarily clockwise trajectory and a second sense if the set of two-dimensional inputs exhibits a primarily counter-clockwise trajectory; accumulating a one-dimensional variable having a magnitude that is a function of the distances of the set of two-dimensional inputs and a sign that is based upon the current chirality; and extracting at least a portion of the accumulated one-dimensional variable as at least one of the set of one-dimensional inputs for the computing system.