METHOD FOR DISPLAYING PARAMETRIC TRIMMING CURVE BY POLYGONAL LINE APPROXIMATION AND GRAPHIC DISPLAY SYSTEM

摘要

PURPOSE: To provide a graphic system provided with a method for approximating a trimming curve by polygonal lines which can reduce an error on the curved face of the trimming curve to a specified value or less. ;CONSTITUTION: A trimming curve previously stored in a filing device 613 or inputted by a mouse 604 or the like is stored in a memory 604. An allowable error value specified from a keyboard 603 is stored in the memory 602. A program for determining the number of polygonal lines based upon an optional allowable error value is stored in the device 613 at the time of approximating a trimming curve by polygonal lines. The program is read out from the device 613 to the memory 602 and executed by a CPU 601, which determines the number of polygonal lines based upon the specified allowable error value, prepares graphic data for the trimming curve and stores the prepared data in the memory 602. The data are transferred to a graphic subsystem 607 and displayed on a CRT 611.;COPYRIGHT: (C)1994,JPO&Japio