SYSTEM FOR GENERATING ORTHOGONAL CONTROL SIGNALS TO PRODUCE CURVILINEAR MOTION

摘要

A system for producing orthogonal control signals for display or tool control purposes. The orthogonal control signals are generated in response to received point and slope data for each of a plurality of curve sections. The generated control signals produce curve strokes which are a variable geometric portion of an ellipse that is constrained by the received point and slope data. In generating the orthogonal control signals a set of four parameters are generated as intermediate controls. The four parameters are readily transformed to produce rotation, scaling or other operations, or are economically stored in memory as part of an instruction set for producing general or predetermined characters, symbols and graphic images from linked curve sections. A sequence of curve sections may be pieced together with smooth transitions free of slope discontinuities.