1. A computer-readable storage device storing a plurality of instructions which, when executed by a processor, cause the processor to display a graphical representation for a path by: determining a set of angles associated with the path; grouping the angles in the set of angles into a set of one or more groups; determining a value for each group in the set of groups based upon the angles from the set of angles that are grouped in that group; and outputting a radial histogram as a graphical representation for the path, the radial histogram comprising a bar for each group in the set of groups, wherein the bar for each group has a length based upon the value determined for the group and wherein the bar for each group has a position rotated from an origin by an average angle representative of the group.