1. A computer system comprising: (a) a computer; (b) a computer monitor coupled to the computer for displaying a design feature and a design-rule halo, the design feature having an outline and a corresponding location, the design-rule halo having an outline; and (c) a CAD software program operating on the computer for controlling the outline and the location of the design feature and the design-rule halo on the computer monitor, said design-rule halo being associated with the design feature, the outline of the design feature having a plurality of sides and a corner disposed between adjacent ones of the sides, the design-rule halo having a plurality of sides, with each of a first subset of the sides of the design-rule halo corresponding to one of the sides of the design feature and a second subset of the sides of the design-rule halo corresponding to one of the corners of the design feature, each side of the second subset being beveled relative to a side of the first subset at a bevel angle greater than 90 degrees and less than 180 degrees.