A computer method and apparatus for combining a brush object element with a trajectory object element in a graphics display system. The brush has a reference point that moves along a trajectory, and any point in application coordinates that is at any position covered by the brush, is assigned an -inside-...http://www.google.de/patents/US5134688?utm_source=gb-gplus-sharePatent US5134688 - Computer method and an apparatus for generating a display picture representing a set of objects including a brush element
